Commit | Line | Data |
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91d76f53 | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa | 3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
91d76f53 | 6 | * |
91d76f53 DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
533a90fb FD |
10 | #include <errno.h> |
11 | #include <fcntl.h> | |
7972aab2 | 12 | #include <inttypes.h> |
91d76f53 DG |
13 | #include <pthread.h> |
14 | #include <stdio.h> | |
15 | #include <stdlib.h> | |
099e26bd | 16 | #include <string.h> |
533a90fb | 17 | #include <sys/mman.h> |
aba8e916 DG |
18 | #include <sys/stat.h> |
19 | #include <sys/types.h> | |
099e26bd | 20 | #include <unistd.h> |
0df502fd | 21 | #include <urcu/compiler.h> |
331744e3 | 22 | #include <signal.h> |
bec39940 | 23 | |
763f0d4c | 24 | #include <common/bytecode/bytecode.h> |
edf4b93e | 25 | #include <common/compat/errno.h> |
990570ed | 26 | #include <common/common.h> |
993578ff JR |
27 | #include <common/hashtable/utils.h> |
28 | #include <lttng/event-rule/event-rule.h> | |
29 | #include <lttng/event-rule/event-rule-internal.h> | |
695f7044 | 30 | #include <lttng/event-rule/user-tracepoint.h> |
993578ff | 31 | #include <lttng/condition/condition.h> |
670a26e4 JR |
32 | #include <lttng/condition/event-rule-matches-internal.h> |
33 | #include <lttng/condition/event-rule-matches.h> | |
f83be61d | 34 | #include <lttng/trigger/trigger-internal.h> |
86acf0da | 35 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 36 | |
7972aab2 | 37 | #include "buffer-registry.h" |
533a90fb | 38 | #include "condition-internal.h" |
86acf0da | 39 | #include "fd-limit.h" |
8782cc74 | 40 | #include "health-sessiond.h" |
56fff090 | 41 | #include "ust-app.h" |
48842b30 | 42 | #include "ust-consumer.h" |
75018ab6 JG |
43 | #include "lttng-ust-ctl.h" |
44 | #include "lttng-ust-error.h" | |
0b2dc8df | 45 | #include "utils.h" |
fb83fe64 | 46 | #include "session.h" |
e9404c27 JG |
47 | #include "lttng-sessiond.h" |
48 | #include "notification-thread-commands.h" | |
5c408ad8 | 49 | #include "rotate.h" |
44760c20 | 50 | #include "event.h" |
533a90fb | 51 | #include "event-notifier-error-accounting.h" |
fb277293 | 52 | #include "ust-field-utils.h" |
d80a6244 | 53 | |
44cdb3a2 MJ |
54 | struct lttng_ht *ust_app_ht; |
55 | struct lttng_ht *ust_app_ht_by_sock; | |
56 | struct lttng_ht *ust_app_ht_by_notify_sock; | |
57 | ||
c4b88406 MD |
58 | static |
59 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
60 | ||
d9bf3ca4 MD |
61 | /* Next available channel key. Access under next_channel_key_lock. */ |
62 | static uint64_t _next_channel_key; | |
63 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
64 | ||
65 | /* Next available session ID. Access under next_session_id_lock. */ | |
66 | static uint64_t _next_session_id; | |
67 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
68 | |
69 | /* | |
d9bf3ca4 | 70 | * Return the incremented value of next_channel_key. |
ffe60014 | 71 | */ |
d9bf3ca4 | 72 | static uint64_t get_next_channel_key(void) |
ffe60014 | 73 | { |
d9bf3ca4 MD |
74 | uint64_t ret; |
75 | ||
76 | pthread_mutex_lock(&next_channel_key_lock); | |
77 | ret = ++_next_channel_key; | |
78 | pthread_mutex_unlock(&next_channel_key_lock); | |
79 | return ret; | |
ffe60014 DG |
80 | } |
81 | ||
82 | /* | |
7972aab2 | 83 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 84 | */ |
d9bf3ca4 | 85 | static uint64_t get_next_session_id(void) |
ffe60014 | 86 | { |
d9bf3ca4 MD |
87 | uint64_t ret; |
88 | ||
89 | pthread_mutex_lock(&next_session_id_lock); | |
90 | ret = ++_next_session_id; | |
91 | pthread_mutex_unlock(&next_session_id_lock); | |
92 | return ret; | |
ffe60014 DG |
93 | } |
94 | ||
d65d2de8 | 95 | static void copy_channel_attr_to_ustctl( |
b623cb6a | 96 | struct lttng_ust_ctl_consumer_channel_attr *attr, |
fc4b93fa | 97 | struct lttng_ust_abi_channel_attr *uattr) |
d65d2de8 DG |
98 | { |
99 | /* Copy event attributes since the layout is different. */ | |
100 | attr->subbuf_size = uattr->subbuf_size; | |
101 | attr->num_subbuf = uattr->num_subbuf; | |
102 | attr->overwrite = uattr->overwrite; | |
103 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
104 | attr->read_timer_interval = uattr->read_timer_interval; | |
7966af57 | 105 | attr->output = (lttng_ust_abi_output) uattr->output; |
491d1539 | 106 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
107 | } |
108 | ||
025faf73 DG |
109 | /* |
110 | * Match function for the hash table lookup. | |
111 | * | |
112 | * It matches an ust app event based on three attributes which are the event | |
113 | * name, the filter bytecode and the loglevel. | |
114 | */ | |
18eace3b DG |
115 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
116 | { | |
117 | struct ust_app_event *event; | |
118 | const struct ust_app_ht_key *key; | |
2106efa0 | 119 | int ev_loglevel_value; |
18eace3b | 120 | |
a0377dfe FD |
121 | LTTNG_ASSERT(node); |
122 | LTTNG_ASSERT(_key); | |
18eace3b DG |
123 | |
124 | event = caa_container_of(node, struct ust_app_event, node.node); | |
7966af57 | 125 | key = (ust_app_ht_key *) _key; |
2106efa0 | 126 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 127 | |
1af53eb5 | 128 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
129 | |
130 | /* Event name */ | |
131 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
132 | goto no_match; | |
133 | } | |
134 | ||
135 | /* Event loglevel. */ | |
2106efa0 | 136 | if (ev_loglevel_value != key->loglevel_type) { |
fc4b93fa | 137 | if (event->attr.loglevel_type == LTTNG_UST_ABI_LOGLEVEL_ALL |
2106efa0 PP |
138 | && key->loglevel_type == 0 && |
139 | ev_loglevel_value == -1) { | |
025faf73 DG |
140 | /* |
141 | * Match is accepted. This is because on event creation, the | |
142 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
143 | * -1 are accepted for this loglevel type since 0 is the one set by | |
144 | * the API when receiving an enable event. | |
145 | */ | |
146 | } else { | |
147 | goto no_match; | |
148 | } | |
18eace3b DG |
149 | } |
150 | ||
151 | /* One of the filters is NULL, fail. */ | |
152 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
153 | goto no_match; | |
154 | } | |
155 | ||
025faf73 DG |
156 | if (key->filter && event->filter) { |
157 | /* Both filters exists, check length followed by the bytecode. */ | |
158 | if (event->filter->len != key->filter->len || | |
159 | memcmp(event->filter->data, key->filter->data, | |
160 | event->filter->len) != 0) { | |
161 | goto no_match; | |
162 | } | |
18eace3b DG |
163 | } |
164 | ||
1af53eb5 JI |
165 | /* One of the exclusions is NULL, fail. */ |
166 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
167 | goto no_match; | |
168 | } | |
169 | ||
170 | if (key->exclusion && event->exclusion) { | |
171 | /* Both exclusions exists, check count followed by the names. */ | |
172 | if (event->exclusion->count != key->exclusion->count || | |
173 | memcmp(event->exclusion->names, key->exclusion->names, | |
fc4b93fa | 174 | event->exclusion->count * LTTNG_UST_ABI_SYM_NAME_LEN) != 0) { |
1af53eb5 JI |
175 | goto no_match; |
176 | } | |
177 | } | |
178 | ||
179 | ||
025faf73 | 180 | /* Match. */ |
18eace3b DG |
181 | return 1; |
182 | ||
183 | no_match: | |
184 | return 0; | |
18eace3b DG |
185 | } |
186 | ||
025faf73 DG |
187 | /* |
188 | * Unique add of an ust app event in the given ht. This uses the custom | |
189 | * ht_match_ust_app_event match function and the event name as hash. | |
190 | */ | |
d0b96690 | 191 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
192 | struct ust_app_event *event) |
193 | { | |
194 | struct cds_lfht_node *node_ptr; | |
195 | struct ust_app_ht_key key; | |
d0b96690 | 196 | struct lttng_ht *ht; |
18eace3b | 197 | |
a0377dfe FD |
198 | LTTNG_ASSERT(ua_chan); |
199 | LTTNG_ASSERT(ua_chan->events); | |
200 | LTTNG_ASSERT(event); | |
18eace3b | 201 | |
d0b96690 | 202 | ht = ua_chan->events; |
18eace3b DG |
203 | key.name = event->attr.name; |
204 | key.filter = event->filter; | |
7966af57 | 205 | key.loglevel_type = (lttng_ust_abi_loglevel_type) event->attr.loglevel; |
91c89f23 | 206 | key.exclusion = event->exclusion; |
18eace3b DG |
207 | |
208 | node_ptr = cds_lfht_add_unique(ht->ht, | |
209 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
210 | ht_match_ust_app_event, &key, &event->node.node); | |
a0377dfe | 211 | LTTNG_ASSERT(node_ptr == &event->node.node); |
18eace3b DG |
212 | } |
213 | ||
d88aee68 DG |
214 | /* |
215 | * Close the notify socket from the given RCU head object. This MUST be called | |
216 | * through a call_rcu(). | |
217 | */ | |
218 | static void close_notify_sock_rcu(struct rcu_head *head) | |
219 | { | |
220 | int ret; | |
221 | struct ust_app_notify_sock_obj *obj = | |
222 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
223 | ||
224 | /* Must have a valid fd here. */ | |
a0377dfe | 225 | LTTNG_ASSERT(obj->fd >= 0); |
d88aee68 DG |
226 | |
227 | ret = close(obj->fd); | |
228 | if (ret) { | |
229 | ERR("close notify sock %d RCU", obj->fd); | |
230 | } | |
231 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
232 | ||
233 | free(obj); | |
234 | } | |
235 | ||
7972aab2 DG |
236 | /* |
237 | * Return the session registry according to the buffer type of the given | |
238 | * session. | |
239 | * | |
240 | * A registry per UID object MUST exists before calling this function or else | |
a0377dfe | 241 | * it LTTNG_ASSERT() if not found. RCU read side lock must be acquired. |
7972aab2 DG |
242 | */ |
243 | static struct ust_registry_session *get_session_registry( | |
244 | struct ust_app_session *ua_sess) | |
245 | { | |
246 | struct ust_registry_session *registry = NULL; | |
247 | ||
a0377dfe | 248 | LTTNG_ASSERT(ua_sess); |
7972aab2 DG |
249 | |
250 | switch (ua_sess->buffer_type) { | |
251 | case LTTNG_BUFFER_PER_PID: | |
252 | { | |
253 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
254 | if (!reg_pid) { | |
255 | goto error; | |
256 | } | |
257 | registry = reg_pid->registry->reg.ust; | |
258 | break; | |
259 | } | |
260 | case LTTNG_BUFFER_PER_UID: | |
261 | { | |
262 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 | 263 | ua_sess->tracing_id, ua_sess->bits_per_long, |
ff588497 | 264 | lttng_credentials_get_uid(&ua_sess->real_credentials)); |
7972aab2 DG |
265 | if (!reg_uid) { |
266 | goto error; | |
267 | } | |
268 | registry = reg_uid->registry->reg.ust; | |
269 | break; | |
270 | } | |
271 | default: | |
a0377dfe | 272 | abort(); |
7972aab2 DG |
273 | }; |
274 | ||
275 | error: | |
276 | return registry; | |
277 | } | |
278 | ||
55cc08a6 DG |
279 | /* |
280 | * Delete ust context safely. RCU read lock must be held before calling | |
281 | * this function. | |
282 | */ | |
283 | static | |
fb45065e MD |
284 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
285 | struct ust_app *app) | |
55cc08a6 | 286 | { |
ffe60014 DG |
287 | int ret; |
288 | ||
a0377dfe | 289 | LTTNG_ASSERT(ua_ctx); |
ffe60014 | 290 | |
55cc08a6 | 291 | if (ua_ctx->obj) { |
fb45065e | 292 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 293 | ret = lttng_ust_ctl_release_object(sock, ua_ctx->obj); |
fb45065e | 294 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
295 | if (ret < 0) { |
296 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
297 | DBG3("UST app release ctx failed. Application is dead: pid = %d, sock = %d", | |
298 | app->pid, app->sock); | |
299 | } else if (ret == -EAGAIN) { | |
300 | WARN("UST app release ctx failed. Communication time out: pid = %d, sock = %d", | |
301 | app->pid, app->sock); | |
302 | } else { | |
303 | ERR("UST app release ctx obj handle %d failed with ret %d: pid = %d, sock = %d", | |
304 | ua_ctx->obj->handle, ret, | |
305 | app->pid, app->sock); | |
306 | } | |
ffe60014 | 307 | } |
55cc08a6 DG |
308 | free(ua_ctx->obj); |
309 | } | |
310 | free(ua_ctx); | |
311 | } | |
312 | ||
d80a6244 DG |
313 | /* |
314 | * Delete ust app event safely. RCU read lock must be held before calling | |
315 | * this function. | |
316 | */ | |
8b366481 | 317 | static |
fb45065e MD |
318 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
319 | struct ust_app *app) | |
d80a6244 | 320 | { |
ffe60014 DG |
321 | int ret; |
322 | ||
a0377dfe | 323 | LTTNG_ASSERT(ua_event); |
ffe60014 | 324 | |
53a80697 | 325 | free(ua_event->filter); |
951f0b71 JI |
326 | if (ua_event->exclusion != NULL) |
327 | free(ua_event->exclusion); | |
edb67388 | 328 | if (ua_event->obj != NULL) { |
fb45065e | 329 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 330 | ret = lttng_ust_ctl_release_object(sock, ua_event->obj); |
fb45065e | 331 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
332 | if (ret < 0) { |
333 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
334 | DBG3("UST app release event failed. Application is dead: pid = %d, sock = %d", | |
335 | app->pid, app->sock); | |
336 | } else if (ret == -EAGAIN) { | |
337 | WARN("UST app release event failed. Communication time out: pid = %d, sock = %d", | |
338 | app->pid, app->sock); | |
339 | } else { | |
340 | ERR("UST app release event obj failed with ret %d: pid = %d, sock = %d", | |
341 | ret, app->pid, app->sock); | |
342 | } | |
ffe60014 | 343 | } |
edb67388 DG |
344 | free(ua_event->obj); |
345 | } | |
d80a6244 DG |
346 | free(ua_event); |
347 | } | |
348 | ||
993578ff JR |
349 | /* |
350 | * Delayed reclaim of a ust_app_event_notifier_rule object. This MUST be called | |
351 | * through a call_rcu(). | |
352 | */ | |
353 | static | |
354 | void free_ust_app_event_notifier_rule_rcu(struct rcu_head *head) | |
355 | { | |
356 | struct ust_app_event_notifier_rule *obj = caa_container_of( | |
357 | head, struct ust_app_event_notifier_rule, rcu_head); | |
358 | ||
359 | free(obj); | |
360 | } | |
361 | ||
362 | /* | |
363 | * Delete ust app event notifier rule safely. | |
364 | */ | |
365 | static void delete_ust_app_event_notifier_rule(int sock, | |
366 | struct ust_app_event_notifier_rule *ua_event_notifier_rule, | |
367 | struct ust_app *app) | |
368 | { | |
369 | int ret; | |
370 | ||
a0377dfe | 371 | LTTNG_ASSERT(ua_event_notifier_rule); |
993578ff JR |
372 | |
373 | if (ua_event_notifier_rule->exclusion != NULL) { | |
374 | free(ua_event_notifier_rule->exclusion); | |
375 | } | |
376 | ||
377 | if (ua_event_notifier_rule->obj != NULL) { | |
378 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 379 | ret = lttng_ust_ctl_release_object(sock, ua_event_notifier_rule->obj); |
993578ff | 380 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
381 | if (ret < 0) { |
382 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
383 | DBG3("UST app release event notifier failed. Application is dead: pid = %d, sock = %d", | |
384 | app->pid, app->sock); | |
385 | } else if (ret == -EAGAIN) { | |
386 | WARN("UST app release event notifier failed. Communication time out: pid = %d, sock = %d", | |
387 | app->pid, app->sock); | |
388 | } else { | |
389 | ERR("UST app release event notifier failed with ret %d: pid = %d, sock = %d", | |
390 | ret, app->pid, app->sock); | |
391 | } | |
993578ff JR |
392 | } |
393 | ||
394 | free(ua_event_notifier_rule->obj); | |
395 | } | |
396 | ||
267d66aa | 397 | lttng_trigger_put(ua_event_notifier_rule->trigger); |
993578ff JR |
398 | call_rcu(&ua_event_notifier_rule->rcu_head, |
399 | free_ust_app_event_notifier_rule_rcu); | |
400 | } | |
401 | ||
d80a6244 | 402 | /* |
7972aab2 DG |
403 | * Release ust data object of the given stream. |
404 | * | |
405 | * Return 0 on success or else a negative value. | |
d80a6244 | 406 | */ |
fb45065e MD |
407 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
408 | struct ust_app *app) | |
d80a6244 | 409 | { |
7972aab2 | 410 | int ret = 0; |
ffe60014 | 411 | |
a0377dfe | 412 | LTTNG_ASSERT(stream); |
ffe60014 | 413 | |
8b366481 | 414 | if (stream->obj) { |
fb45065e | 415 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 416 | ret = lttng_ust_ctl_release_object(sock, stream->obj); |
fb45065e | 417 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
418 | if (ret < 0) { |
419 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
420 | DBG3("UST app release stream failed. Application is dead: pid = %d, sock = %d", | |
421 | app->pid, app->sock); | |
422 | } else if (ret == -EAGAIN) { | |
423 | WARN("UST app release stream failed. Communication time out: pid = %d, sock = %d", | |
424 | app->pid, app->sock); | |
425 | } else { | |
426 | ERR("UST app release stream obj failed with ret %d: pid = %d, sock = %d", | |
427 | ret, app->pid, app->sock); | |
428 | } | |
ffe60014 | 429 | } |
4063050c | 430 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
431 | free(stream->obj); |
432 | } | |
7972aab2 DG |
433 | |
434 | return ret; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Delete ust app stream safely. RCU read lock must be held before calling | |
439 | * this function. | |
440 | */ | |
441 | static | |
fb45065e MD |
442 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
443 | struct ust_app *app) | |
7972aab2 | 444 | { |
a0377dfe | 445 | LTTNG_ASSERT(stream); |
7972aab2 | 446 | |
fb45065e | 447 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 448 | free(stream); |
d80a6244 DG |
449 | } |
450 | ||
36b588ed MD |
451 | /* |
452 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
453 | * section and outside of call_rcu thread, so we postpone its execution |
454 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
455 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
456 | */ |
457 | static | |
458 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
459 | { | |
460 | struct ust_app_channel *ua_chan = | |
461 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
462 | ||
0b2dc8df MD |
463 | ht_cleanup_push(ua_chan->ctx); |
464 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
465 | free(ua_chan); |
466 | } | |
467 | ||
fb83fe64 JD |
468 | /* |
469 | * Extract the lost packet or discarded events counter when the channel is | |
470 | * being deleted and store the value in the parent channel so we can | |
471 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
472 | * |
473 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
474 | */ |
475 | static | |
476 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
477 | { | |
478 | uint64_t discarded = 0, lost = 0; | |
479 | struct ltt_session *session; | |
480 | struct ltt_ust_channel *uchan; | |
481 | ||
fc4b93fa | 482 | if (ua_chan->attr.type != LTTNG_UST_ABI_CHAN_PER_CPU) { |
fb83fe64 JD |
483 | return; |
484 | } | |
485 | ||
486 | rcu_read_lock(); | |
487 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
488 | if (!session || !session->ust_session) { |
489 | /* | |
490 | * Not finding the session is not an error because there are | |
491 | * multiple ways the channels can be torn down. | |
492 | * | |
493 | * 1) The session daemon can initiate the destruction of the | |
494 | * ust app session after receiving a destroy command or | |
495 | * during its shutdown/teardown. | |
496 | * 2) The application, since we are in per-pid tracing, is | |
497 | * unregistering and tearing down its ust app session. | |
498 | * | |
499 | * Both paths are protected by the session list lock which | |
500 | * ensures that the accounting of lost packets and discarded | |
501 | * events is done exactly once. The session is then unpublished | |
502 | * from the session list, resulting in this condition. | |
503 | */ | |
fb83fe64 JD |
504 | goto end; |
505 | } | |
506 | ||
507 | if (ua_chan->attr.overwrite) { | |
508 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
509 | ua_chan->key, session->ust_session->consumer, | |
510 | &lost); | |
511 | } else { | |
512 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
513 | ua_chan->key, session->ust_session->consumer, | |
514 | &discarded); | |
515 | } | |
516 | uchan = trace_ust_find_channel_by_name( | |
517 | session->ust_session->domain_global.channels, | |
518 | ua_chan->name); | |
519 | if (!uchan) { | |
520 | ERR("Missing UST channel to store discarded counters"); | |
521 | goto end; | |
522 | } | |
523 | ||
524 | uchan->per_pid_closed_app_discarded += discarded; | |
525 | uchan->per_pid_closed_app_lost += lost; | |
526 | ||
527 | end: | |
528 | rcu_read_unlock(); | |
e32d7f27 JG |
529 | if (session) { |
530 | session_put(session); | |
531 | } | |
fb83fe64 JD |
532 | } |
533 | ||
d80a6244 DG |
534 | /* |
535 | * Delete ust app channel safely. RCU read lock must be held before calling | |
536 | * this function. | |
82cac6d2 JG |
537 | * |
538 | * The session list lock must be held by the caller. | |
d80a6244 | 539 | */ |
8b366481 | 540 | static |
d0b96690 DG |
541 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
542 | struct ust_app *app) | |
d80a6244 DG |
543 | { |
544 | int ret; | |
bec39940 | 545 | struct lttng_ht_iter iter; |
d80a6244 | 546 | struct ust_app_event *ua_event; |
55cc08a6 | 547 | struct ust_app_ctx *ua_ctx; |
030a66fa | 548 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 549 | struct ust_registry_session *registry; |
d80a6244 | 550 | |
a0377dfe | 551 | LTTNG_ASSERT(ua_chan); |
ffe60014 DG |
552 | |
553 | DBG3("UST app deleting channel %s", ua_chan->name); | |
554 | ||
55cc08a6 | 555 | /* Wipe stream */ |
d80a6244 | 556 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 557 | cds_list_del(&stream->list); |
fb45065e | 558 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
559 | } |
560 | ||
55cc08a6 | 561 | /* Wipe context */ |
bec39940 | 562 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 563 | cds_list_del(&ua_ctx->list); |
bec39940 | 564 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
a0377dfe | 565 | LTTNG_ASSERT(!ret); |
fb45065e | 566 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 567 | } |
d80a6244 | 568 | |
55cc08a6 | 569 | /* Wipe events */ |
bec39940 DG |
570 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
571 | node.node) { | |
572 | ret = lttng_ht_del(ua_chan->events, &iter); | |
a0377dfe | 573 | LTTNG_ASSERT(!ret); |
fb45065e | 574 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 575 | } |
edb67388 | 576 | |
c8335706 MD |
577 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
578 | /* Wipe and free registry from session registry. */ | |
579 | registry = get_session_registry(ua_chan->session); | |
580 | if (registry) { | |
e9404c27 | 581 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
582 | sock >= 0); |
583 | } | |
45798a31 JG |
584 | /* |
585 | * A negative socket can be used by the caller when | |
586 | * cleaning-up a ua_chan in an error path. Skip the | |
587 | * accounting in this case. | |
588 | */ | |
e38d96f9 MD |
589 | if (sock >= 0) { |
590 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 591 | } |
7972aab2 | 592 | } |
d0b96690 | 593 | |
edb67388 | 594 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
595 | /* Remove channel from application UST object descriptor. */ |
596 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 | 597 | ret = lttng_ht_del(app->ust_objd, &iter); |
a0377dfe | 598 | LTTNG_ASSERT(!ret); |
fb45065e | 599 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 600 | ret = lttng_ust_ctl_release_object(sock, ua_chan->obj); |
fb45065e | 601 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
602 | if (ret < 0) { |
603 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
604 | DBG3("UST app channel %s release failed. Application is dead: pid = %d, sock = %d", | |
605 | ua_chan->name, app->pid, | |
606 | app->sock); | |
607 | } else if (ret == -EAGAIN) { | |
608 | WARN("UST app channel %s release failed. Communication time out: pid = %d, sock = %d", | |
609 | ua_chan->name, app->pid, | |
610 | app->sock); | |
611 | } else { | |
612 | ERR("UST app channel %s release failed with ret %d: pid = %d, sock = %d", | |
613 | ua_chan->name, ret, app->pid, | |
614 | app->sock); | |
615 | } | |
ffe60014 | 616 | } |
7972aab2 | 617 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
618 | free(ua_chan->obj); |
619 | } | |
36b588ed | 620 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
621 | } |
622 | ||
fb45065e MD |
623 | int ust_app_register_done(struct ust_app *app) |
624 | { | |
625 | int ret; | |
626 | ||
627 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 628 | ret = lttng_ust_ctl_register_done(app->sock); |
fb45065e MD |
629 | pthread_mutex_unlock(&app->sock_lock); |
630 | return ret; | |
631 | } | |
632 | ||
fc4b93fa | 633 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data) |
fb45065e MD |
634 | { |
635 | int ret, sock; | |
636 | ||
637 | if (app) { | |
638 | pthread_mutex_lock(&app->sock_lock); | |
639 | sock = app->sock; | |
640 | } else { | |
641 | sock = -1; | |
642 | } | |
b623cb6a | 643 | ret = lttng_ust_ctl_release_object(sock, data); |
fb45065e MD |
644 | if (app) { |
645 | pthread_mutex_unlock(&app->sock_lock); | |
646 | } | |
647 | return ret; | |
648 | } | |
649 | ||
331744e3 | 650 | /* |
1b532a60 DG |
651 | * Push metadata to consumer socket. |
652 | * | |
0f1b1d25 | 653 | * RCU read-side lock must be held to guarantee existence of socket. |
dc2bbdae MD |
654 | * Must be called with the ust app session lock held. |
655 | * Must be called with the registry lock held. | |
331744e3 JD |
656 | * |
657 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
658 | * Returning a -EPIPE return value means we could not send the metadata, |
659 | * but it can be caused by recoverable errors (e.g. the application has | |
660 | * terminated concurrently). | |
331744e3 JD |
661 | */ |
662 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
663 | struct consumer_socket *socket, int send_zero_data) | |
664 | { | |
665 | int ret; | |
666 | char *metadata_str = NULL; | |
c585821b | 667 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 668 | ssize_t ret_val; |
93ec662e | 669 | uint64_t metadata_key, metadata_version; |
331744e3 | 670 | |
a0377dfe FD |
671 | LTTNG_ASSERT(registry); |
672 | LTTNG_ASSERT(socket); | |
1b532a60 | 673 | |
c585821b MD |
674 | metadata_key = registry->metadata_key; |
675 | ||
ce34fcd0 | 676 | /* |
dc2bbdae MD |
677 | * Means that no metadata was assigned to the session. This can |
678 | * happens if no start has been done previously. | |
ce34fcd0 | 679 | */ |
c585821b | 680 | if (!metadata_key) { |
ce34fcd0 MD |
681 | return 0; |
682 | } | |
683 | ||
331744e3 JD |
684 | offset = registry->metadata_len_sent; |
685 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 686 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 687 | metadata_version = registry->metadata_version; |
331744e3 JD |
688 | if (len == 0) { |
689 | DBG3("No metadata to push for metadata key %" PRIu64, | |
690 | registry->metadata_key); | |
691 | ret_val = len; | |
692 | if (send_zero_data) { | |
693 | DBG("No metadata to push"); | |
694 | goto push_data; | |
695 | } | |
696 | goto end; | |
697 | } | |
698 | ||
699 | /* Allocate only what we have to send. */ | |
7966af57 | 700 | metadata_str = (char *) zmalloc(len); |
331744e3 JD |
701 | if (!metadata_str) { |
702 | PERROR("zmalloc ust app metadata string"); | |
703 | ret_val = -ENOMEM; | |
704 | goto error; | |
705 | } | |
c585821b | 706 | /* Copy what we haven't sent out. */ |
331744e3 | 707 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
708 | |
709 | push_data: | |
c585821b MD |
710 | pthread_mutex_unlock(®istry->lock); |
711 | /* | |
712 | * We need to unlock the registry while we push metadata to | |
713 | * break a circular dependency between the consumerd metadata | |
714 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
715 | * to the consumerd awaits that it gets pushed all the way to | |
716 | * relayd, but doing so requires grabbing the metadata lock. If | |
717 | * a concurrent metadata request is being performed by | |
718 | * consumerd, this can try to grab the registry lock on the | |
719 | * sessiond while holding the metadata lock on the consumer | |
720 | * daemon. Those push and pull schemes are performed on two | |
721 | * different bidirectionnal communication sockets. | |
722 | */ | |
723 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 724 | metadata_str, len, offset, metadata_version); |
c585821b | 725 | pthread_mutex_lock(®istry->lock); |
331744e3 | 726 | if (ret < 0) { |
000baf6a | 727 | /* |
dc2bbdae MD |
728 | * There is an acceptable race here between the registry |
729 | * metadata key assignment and the creation on the | |
730 | * consumer. The session daemon can concurrently push | |
731 | * metadata for this registry while being created on the | |
732 | * consumer since the metadata key of the registry is | |
733 | * assigned *before* it is setup to avoid the consumer | |
734 | * to ask for metadata that could possibly be not found | |
735 | * in the session daemon. | |
000baf6a | 736 | * |
dc2bbdae MD |
737 | * The metadata will get pushed either by the session |
738 | * being stopped or the consumer requesting metadata if | |
739 | * that race is triggered. | |
000baf6a DG |
740 | */ |
741 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
742 | ret = 0; | |
c585821b MD |
743 | } else { |
744 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 745 | } |
331744e3 JD |
746 | ret_val = ret; |
747 | goto error_push; | |
c585821b MD |
748 | } else { |
749 | /* | |
750 | * Metadata may have been concurrently pushed, since | |
751 | * we're not holding the registry lock while pushing to | |
752 | * consumer. This is handled by the fact that we send | |
753 | * the metadata content, size, and the offset at which | |
754 | * that metadata belongs. This may arrive out of order | |
755 | * on the consumer side, and the consumer is able to | |
756 | * deal with overlapping fragments. The consumer | |
757 | * supports overlapping fragments, which must be | |
758 | * contiguous starting from offset 0. We keep the | |
759 | * largest metadata_len_sent value of the concurrent | |
760 | * send. | |
761 | */ | |
762 | registry->metadata_len_sent = | |
7966af57 | 763 | std::max(registry->metadata_len_sent, |
c585821b | 764 | new_metadata_len_sent); |
331744e3 | 765 | } |
331744e3 JD |
766 | free(metadata_str); |
767 | return len; | |
768 | ||
769 | end: | |
770 | error: | |
ce34fcd0 MD |
771 | if (ret_val) { |
772 | /* | |
dc2bbdae MD |
773 | * On error, flag the registry that the metadata is |
774 | * closed. We were unable to push anything and this | |
775 | * means that either the consumer is not responding or | |
776 | * the metadata cache has been destroyed on the | |
777 | * consumer. | |
ce34fcd0 MD |
778 | */ |
779 | registry->metadata_closed = 1; | |
780 | } | |
331744e3 JD |
781 | error_push: |
782 | free(metadata_str); | |
783 | return ret_val; | |
784 | } | |
785 | ||
d88aee68 | 786 | /* |
ce34fcd0 | 787 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
788 | * Either sock or consumer is required : if sock is NULL, the default |
789 | * socket to send the metadata is retrieved from consumer, if sock | |
790 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 791 | * RCU read-side lock must be held while calling this function, |
0f1b1d25 | 792 | * therefore ensuring existence of registry. It also ensures existence |
dc2bbdae | 793 | * of socket throughout this function. |
d88aee68 DG |
794 | * |
795 | * Return 0 on success else a negative error. | |
2c57e06d MD |
796 | * Returning a -EPIPE return value means we could not send the metadata, |
797 | * but it can be caused by recoverable errors (e.g. the application has | |
798 | * terminated concurrently). | |
d88aee68 | 799 | */ |
7972aab2 DG |
800 | static int push_metadata(struct ust_registry_session *registry, |
801 | struct consumer_output *consumer) | |
d88aee68 | 802 | { |
331744e3 JD |
803 | int ret_val; |
804 | ssize_t ret; | |
d88aee68 DG |
805 | struct consumer_socket *socket; |
806 | ||
a0377dfe FD |
807 | LTTNG_ASSERT(registry); |
808 | LTTNG_ASSERT(consumer); | |
7972aab2 | 809 | |
ce34fcd0 | 810 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 811 | if (registry->metadata_closed) { |
dc2bbdae MD |
812 | ret_val = -EPIPE; |
813 | goto error; | |
d88aee68 DG |
814 | } |
815 | ||
d88aee68 | 816 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
817 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
818 | consumer); | |
d88aee68 | 819 | if (!socket) { |
331744e3 | 820 | ret_val = -1; |
ce34fcd0 | 821 | goto error; |
d88aee68 DG |
822 | } |
823 | ||
331744e3 | 824 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 825 | if (ret < 0) { |
331744e3 | 826 | ret_val = ret; |
ce34fcd0 | 827 | goto error; |
d88aee68 | 828 | } |
dc2bbdae | 829 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
830 | return 0; |
831 | ||
ce34fcd0 | 832 | error: |
dc2bbdae | 833 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 834 | return ret_val; |
d88aee68 DG |
835 | } |
836 | ||
837 | /* | |
838 | * Send to the consumer a close metadata command for the given session. Once | |
839 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 840 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
841 | * in the destroy path. |
842 | * | |
a70ac2f4 MD |
843 | * Do not hold the registry lock while communicating with the consumerd, because |
844 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
845 | * the metadata request notification. | |
846 | * | |
d88aee68 DG |
847 | * Return 0 on success else a negative value. |
848 | */ | |
7972aab2 DG |
849 | static int close_metadata(struct ust_registry_session *registry, |
850 | struct consumer_output *consumer) | |
d88aee68 DG |
851 | { |
852 | int ret; | |
853 | struct consumer_socket *socket; | |
a70ac2f4 MD |
854 | uint64_t metadata_key; |
855 | bool registry_was_already_closed; | |
d88aee68 | 856 | |
a0377dfe FD |
857 | LTTNG_ASSERT(registry); |
858 | LTTNG_ASSERT(consumer); | |
d88aee68 | 859 | |
7972aab2 DG |
860 | rcu_read_lock(); |
861 | ||
ce34fcd0 | 862 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
863 | metadata_key = registry->metadata_key; |
864 | registry_was_already_closed = registry->metadata_closed; | |
865 | if (metadata_key != 0) { | |
866 | /* | |
867 | * Metadata closed. Even on error this means that the consumer | |
868 | * is not responding or not found so either way a second close | |
869 | * should NOT be emit for this registry. | |
870 | */ | |
871 | registry->metadata_closed = 1; | |
872 | } | |
873 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 874 | |
a70ac2f4 | 875 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 876 | ret = 0; |
1b532a60 | 877 | goto end; |
d88aee68 DG |
878 | } |
879 | ||
d88aee68 | 880 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
881 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
882 | consumer); | |
d88aee68 DG |
883 | if (!socket) { |
884 | ret = -1; | |
a70ac2f4 | 885 | goto end; |
d88aee68 DG |
886 | } |
887 | ||
a70ac2f4 | 888 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 889 | if (ret < 0) { |
a70ac2f4 | 890 | goto end; |
d88aee68 DG |
891 | } |
892 | ||
1b532a60 | 893 | end: |
7972aab2 | 894 | rcu_read_unlock(); |
d88aee68 DG |
895 | return ret; |
896 | } | |
897 | ||
36b588ed MD |
898 | /* |
899 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
900 | * section and outside of call_rcu thread, so we postpone its execution |
901 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
902 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
903 | */ |
904 | static | |
905 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
906 | { | |
907 | struct ust_app_session *ua_sess = | |
908 | caa_container_of(head, struct ust_app_session, rcu_head); | |
909 | ||
0b2dc8df | 910 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
911 | free(ua_sess); |
912 | } | |
913 | ||
d80a6244 DG |
914 | /* |
915 | * Delete ust app session safely. RCU read lock must be held before calling | |
916 | * this function. | |
82cac6d2 JG |
917 | * |
918 | * The session list lock must be held by the caller. | |
d80a6244 | 919 | */ |
8b366481 | 920 | static |
d0b96690 DG |
921 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
922 | struct ust_app *app) | |
d80a6244 DG |
923 | { |
924 | int ret; | |
bec39940 | 925 | struct lttng_ht_iter iter; |
d80a6244 | 926 | struct ust_app_channel *ua_chan; |
7972aab2 | 927 | struct ust_registry_session *registry; |
d80a6244 | 928 | |
a0377dfe | 929 | LTTNG_ASSERT(ua_sess); |
d88aee68 | 930 | |
1b532a60 DG |
931 | pthread_mutex_lock(&ua_sess->lock); |
932 | ||
a0377dfe | 933 | LTTNG_ASSERT(!ua_sess->deleted); |
b161602a MD |
934 | ua_sess->deleted = true; |
935 | ||
7972aab2 | 936 | registry = get_session_registry(ua_sess); |
fad1ed2f | 937 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 938 | if (registry) { |
d88aee68 | 939 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 940 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 941 | |
7972aab2 DG |
942 | /* |
943 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
944 | * metadata only on destroy trace session in this case. Also, the |
945 | * previous push metadata could have flag the metadata registry to | |
946 | * close so don't send a close command if closed. | |
7972aab2 | 947 | */ |
ce34fcd0 | 948 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
949 | /* And ask to close it for this session registry. */ |
950 | (void) close_metadata(registry, ua_sess->consumer); | |
951 | } | |
d80a6244 DG |
952 | } |
953 | ||
bec39940 DG |
954 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
955 | node.node) { | |
956 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
a0377dfe | 957 | LTTNG_ASSERT(!ret); |
d0b96690 | 958 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 959 | } |
d80a6244 | 960 | |
7972aab2 DG |
961 | /* In case of per PID, the registry is kept in the session. */ |
962 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
963 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
964 | if (reg_pid) { | |
fad1ed2f JR |
965 | /* |
966 | * Registry can be null on error path during | |
967 | * initialization. | |
968 | */ | |
7972aab2 DG |
969 | buffer_reg_pid_remove(reg_pid); |
970 | buffer_reg_pid_destroy(reg_pid); | |
971 | } | |
972 | } | |
d0b96690 | 973 | |
aee6bafd | 974 | if (ua_sess->handle != -1) { |
fb45065e | 975 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 976 | ret = lttng_ust_ctl_release_handle(sock, ua_sess->handle); |
fb45065e | 977 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
978 | if (ret < 0) { |
979 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
980 | DBG3("UST app release session handle failed. Application is dead: pid = %d, sock = %d", | |
981 | app->pid, app->sock); | |
982 | } else if (ret == -EAGAIN) { | |
983 | WARN("UST app release session handle failed. Communication time out: pid = %d, sock = %d", | |
984 | app->pid, app->sock); | |
985 | } else { | |
986 | ERR("UST app release session handle failed with ret %d: pid = %d, sock = %d", | |
987 | ret, app->pid, app->sock); | |
988 | } | |
ffe60014 | 989 | } |
be355079 | 990 | |
10b56aef MD |
991 | /* Remove session from application UST object descriptor. */ |
992 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
993 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
a0377dfe | 994 | LTTNG_ASSERT(!ret); |
aee6bafd | 995 | } |
10b56aef | 996 | |
1b532a60 DG |
997 | pthread_mutex_unlock(&ua_sess->lock); |
998 | ||
6addfa37 MD |
999 | consumer_output_put(ua_sess->consumer); |
1000 | ||
36b588ed | 1001 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 1002 | } |
91d76f53 DG |
1003 | |
1004 | /* | |
284d8f55 DG |
1005 | * Delete a traceable application structure from the global list. Never call |
1006 | * this function outside of a call_rcu call. | |
91d76f53 | 1007 | */ |
8b366481 DG |
1008 | static |
1009 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 1010 | { |
8b366481 | 1011 | int ret, sock; |
d42f20df | 1012 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
993578ff JR |
1013 | struct lttng_ht_iter iter; |
1014 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5e2abfaf | 1015 | bool event_notifier_write_fd_is_open; |
44d3bd01 | 1016 | |
82cac6d2 JG |
1017 | /* |
1018 | * The session list lock must be held during this function to guarantee | |
1019 | * the existence of ua_sess. | |
1020 | */ | |
1021 | session_lock_list(); | |
d80a6244 | 1022 | /* Delete ust app sessions info */ |
852d0037 DG |
1023 | sock = app->sock; |
1024 | app->sock = -1; | |
d80a6244 | 1025 | |
8b366481 | 1026 | /* Wipe sessions */ |
d42f20df DG |
1027 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
1028 | teardown_node) { | |
1029 | /* Free every object in the session and the session. */ | |
36b588ed | 1030 | rcu_read_lock(); |
d0b96690 | 1031 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 1032 | rcu_read_unlock(); |
d80a6244 | 1033 | } |
36b588ed | 1034 | |
993578ff JR |
1035 | /* Remove the event notifier rules associated with this app. */ |
1036 | rcu_read_lock(); | |
1037 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
1038 | &iter.iter, event_notifier_rule, node.node) { | |
1039 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, &iter); | |
a0377dfe | 1040 | LTTNG_ASSERT(!ret); |
993578ff JR |
1041 | |
1042 | delete_ust_app_event_notifier_rule( | |
1043 | app->sock, event_notifier_rule, app); | |
1044 | } | |
1045 | ||
1046 | rcu_read_unlock(); | |
1047 | ||
0b2dc8df | 1048 | ht_cleanup_push(app->sessions); |
10b56aef | 1049 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 1050 | ht_cleanup_push(app->ust_objd); |
993578ff | 1051 | ht_cleanup_push(app->token_to_event_notifier_rule_ht); |
d80a6244 | 1052 | |
da873412 JR |
1053 | /* |
1054 | * This could be NULL if the event notifier setup failed (e.g the app | |
1055 | * was killed or the tracer does not support this feature). | |
1056 | */ | |
1057 | if (app->event_notifier_group.object) { | |
1058 | enum lttng_error_code ret_code; | |
533a90fb FD |
1059 | enum event_notifier_error_accounting_status status; |
1060 | ||
da873412 JR |
1061 | const int event_notifier_read_fd = lttng_pipe_get_readfd( |
1062 | app->event_notifier_group.event_pipe); | |
1063 | ||
1064 | ret_code = notification_thread_command_remove_tracer_event_source( | |
412d7227 | 1065 | the_notification_thread_handle, |
da873412 JR |
1066 | event_notifier_read_fd); |
1067 | if (ret_code != LTTNG_OK) { | |
1068 | ERR("Failed to remove application tracer event source from notification thread"); | |
1069 | } | |
1070 | ||
533a90fb FD |
1071 | status = event_notifier_error_accounting_unregister_app(app); |
1072 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
1073 | ERR("Error unregistering app from event notifier error accounting"); | |
1074 | } | |
1075 | ||
b623cb6a | 1076 | lttng_ust_ctl_release_object(sock, app->event_notifier_group.object); |
da873412 JR |
1077 | free(app->event_notifier_group.object); |
1078 | } | |
1079 | ||
5e2abfaf JG |
1080 | event_notifier_write_fd_is_open = lttng_pipe_is_write_open( |
1081 | app->event_notifier_group.event_pipe); | |
da873412 | 1082 | lttng_pipe_destroy(app->event_notifier_group.event_pipe); |
5e2abfaf JG |
1083 | /* |
1084 | * Release the file descriptors reserved for the event notifier pipe. | |
1085 | * The app could be destroyed before the write end of the pipe could be | |
1086 | * passed to the application (and closed). In that case, both file | |
1087 | * descriptors must be released. | |
1088 | */ | |
1089 | lttng_fd_put(LTTNG_FD_APPS, event_notifier_write_fd_is_open ? 2 : 1); | |
da873412 | 1090 | |
6414a713 | 1091 | /* |
852d0037 DG |
1092 | * Wait until we have deleted the application from the sock hash table |
1093 | * before closing this socket, otherwise an application could re-use the | |
1094 | * socket ID and race with the teardown, using the same hash table entry. | |
1095 | * | |
1096 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
1097 | * all RCU readers that could run concurrently with unregister app, | |
1098 | * therefore we _need_ to only close that socket after a grace period. So | |
1099 | * it should stay in this RCU callback. | |
1100 | * | |
1101 | * This close() is a very important step of the synchronization model so | |
1102 | * every modification to this function must be carefully reviewed. | |
6414a713 | 1103 | */ |
799e2c4f MD |
1104 | ret = close(sock); |
1105 | if (ret) { | |
1106 | PERROR("close"); | |
1107 | } | |
4063050c | 1108 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 1109 | |
852d0037 | 1110 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 1111 | free(app); |
82cac6d2 | 1112 | session_unlock_list(); |
099e26bd DG |
1113 | } |
1114 | ||
1115 | /* | |
f6a9efaa | 1116 | * URCU intermediate call to delete an UST app. |
099e26bd | 1117 | */ |
8b366481 DG |
1118 | static |
1119 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 1120 | { |
bec39940 DG |
1121 | struct lttng_ht_node_ulong *node = |
1122 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 1123 | struct ust_app *app = |
852d0037 | 1124 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 1125 | |
852d0037 | 1126 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 1127 | delete_ust_app(app); |
099e26bd DG |
1128 | } |
1129 | ||
ffe60014 DG |
1130 | /* |
1131 | * Delete the session from the application ht and delete the data structure by | |
1132 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
1133 | * |
1134 | * The session list lock must be held by the caller. | |
ffe60014 | 1135 | */ |
d0b96690 | 1136 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
1137 | struct ust_app_session *ua_sess) |
1138 | { | |
1139 | int ret; | |
1140 | struct lttng_ht_iter iter; | |
1141 | ||
a0377dfe FD |
1142 | LTTNG_ASSERT(app); |
1143 | LTTNG_ASSERT(ua_sess); | |
ffe60014 DG |
1144 | |
1145 | iter.iter.node = &ua_sess->node.node; | |
1146 | ret = lttng_ht_del(app->sessions, &iter); | |
1147 | if (ret) { | |
1148 | /* Already scheduled for teardown. */ | |
1149 | goto end; | |
1150 | } | |
1151 | ||
1152 | /* Once deleted, free the data structure. */ | |
d0b96690 | 1153 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
1154 | |
1155 | end: | |
1156 | return; | |
1157 | } | |
1158 | ||
8b366481 DG |
1159 | /* |
1160 | * Alloc new UST app session. | |
1161 | */ | |
1162 | static | |
40bbd087 | 1163 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1164 | { |
1165 | struct ust_app_session *ua_sess; | |
1166 | ||
1167 | /* Init most of the default value by allocating and zeroing */ | |
7966af57 | 1168 | ua_sess = (ust_app_session *) zmalloc(sizeof(struct ust_app_session)); |
8b366481 DG |
1169 | if (ua_sess == NULL) { |
1170 | PERROR("malloc"); | |
ffe60014 | 1171 | goto error_free; |
8b366481 DG |
1172 | } |
1173 | ||
1174 | ua_sess->handle = -1; | |
bec39940 | 1175 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
fc4b93fa | 1176 | ua_sess->metadata_attr.type = LTTNG_UST_ABI_CHAN_METADATA; |
84ad93e8 | 1177 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1178 | |
8b366481 DG |
1179 | return ua_sess; |
1180 | ||
ffe60014 | 1181 | error_free: |
8b366481 DG |
1182 | return NULL; |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * Alloc new UST app channel. | |
1187 | */ | |
1188 | static | |
b53d4e59 | 1189 | struct ust_app_channel *alloc_ust_app_channel(const char *name, |
d0b96690 | 1190 | struct ust_app_session *ua_sess, |
fc4b93fa | 1191 | struct lttng_ust_abi_channel_attr *attr) |
8b366481 DG |
1192 | { |
1193 | struct ust_app_channel *ua_chan; | |
1194 | ||
1195 | /* Init most of the default value by allocating and zeroing */ | |
7966af57 | 1196 | ua_chan = (ust_app_channel *) zmalloc(sizeof(struct ust_app_channel)); |
8b366481 DG |
1197 | if (ua_chan == NULL) { |
1198 | PERROR("malloc"); | |
1199 | goto error; | |
1200 | } | |
1201 | ||
1202 | /* Setup channel name */ | |
1203 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1204 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1205 | ||
1206 | ua_chan->enabled = 1; | |
1207 | ua_chan->handle = -1; | |
45893984 | 1208 | ua_chan->session = ua_sess; |
ffe60014 | 1209 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1210 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1211 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1212 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1213 | |
1214 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1215 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1216 | |
1217 | /* Copy attributes */ | |
1218 | if (attr) { | |
b623cb6a | 1219 | /* Translate from lttng_ust_channel to lttng_ust_ctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1220 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1221 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1222 | ua_chan->attr.overwrite = attr->overwrite; | |
1223 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1224 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
7966af57 | 1225 | ua_chan->attr.output = (lttng_ust_abi_output) attr->output; |
491d1539 | 1226 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1227 | } |
ffe60014 | 1228 | /* By default, the channel is a per cpu channel. */ |
fc4b93fa | 1229 | ua_chan->attr.type = LTTNG_UST_ABI_CHAN_PER_CPU; |
8b366481 DG |
1230 | |
1231 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1232 | ||
1233 | return ua_chan; | |
1234 | ||
1235 | error: | |
1236 | return NULL; | |
1237 | } | |
1238 | ||
37f1c236 DG |
1239 | /* |
1240 | * Allocate and initialize a UST app stream. | |
1241 | * | |
1242 | * Return newly allocated stream pointer or NULL on error. | |
1243 | */ | |
ffe60014 | 1244 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1245 | { |
1246 | struct ust_app_stream *stream = NULL; | |
1247 | ||
7966af57 | 1248 | stream = (ust_app_stream *) zmalloc(sizeof(*stream)); |
37f1c236 DG |
1249 | if (stream == NULL) { |
1250 | PERROR("zmalloc ust app stream"); | |
1251 | goto error; | |
1252 | } | |
1253 | ||
1254 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1255 | stream->handle = -1; | |
1256 | ||
1257 | error: | |
1258 | return stream; | |
1259 | } | |
1260 | ||
8b366481 DG |
1261 | /* |
1262 | * Alloc new UST app event. | |
1263 | */ | |
1264 | static | |
1265 | struct ust_app_event *alloc_ust_app_event(char *name, | |
fc4b93fa | 1266 | struct lttng_ust_abi_event *attr) |
8b366481 DG |
1267 | { |
1268 | struct ust_app_event *ua_event; | |
1269 | ||
1270 | /* Init most of the default value by allocating and zeroing */ | |
7966af57 | 1271 | ua_event = (ust_app_event *) zmalloc(sizeof(struct ust_app_event)); |
8b366481 | 1272 | if (ua_event == NULL) { |
20533947 | 1273 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1274 | goto error; |
1275 | } | |
1276 | ||
1277 | ua_event->enabled = 1; | |
1278 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1279 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1280 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1281 | |
1282 | /* Copy attributes */ | |
1283 | if (attr) { | |
1284 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1285 | } | |
1286 | ||
1287 | DBG3("UST app event %s allocated", ua_event->name); | |
1288 | ||
1289 | return ua_event; | |
1290 | ||
1291 | error: | |
1292 | return NULL; | |
1293 | } | |
1294 | ||
993578ff JR |
1295 | /* |
1296 | * Allocate a new UST app event notifier rule. | |
1297 | */ | |
1298 | static struct ust_app_event_notifier_rule *alloc_ust_app_event_notifier_rule( | |
267d66aa | 1299 | struct lttng_trigger *trigger) |
993578ff JR |
1300 | { |
1301 | enum lttng_event_rule_generate_exclusions_status | |
1302 | generate_exclusion_status; | |
cc3b9644 | 1303 | enum lttng_condition_status cond_status; |
993578ff | 1304 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; |
267d66aa JR |
1305 | struct lttng_condition *condition = NULL; |
1306 | const struct lttng_event_rule *event_rule = NULL; | |
993578ff | 1307 | |
7966af57 | 1308 | ua_event_notifier_rule = (ust_app_event_notifier_rule *) zmalloc(sizeof(struct ust_app_event_notifier_rule)); |
993578ff JR |
1309 | if (ua_event_notifier_rule == NULL) { |
1310 | PERROR("Failed to allocate ust_app_event_notifier_rule structure"); | |
1311 | goto error; | |
1312 | } | |
1313 | ||
1314 | ua_event_notifier_rule->enabled = 1; | |
267d66aa JR |
1315 | ua_event_notifier_rule->token = lttng_trigger_get_tracer_token(trigger); |
1316 | lttng_ht_node_init_u64(&ua_event_notifier_rule->node, | |
1317 | ua_event_notifier_rule->token); | |
993578ff | 1318 | |
267d66aa | 1319 | condition = lttng_trigger_get_condition(trigger); |
a0377dfe FD |
1320 | LTTNG_ASSERT(condition); |
1321 | LTTNG_ASSERT(lttng_condition_get_type(condition) == | |
8dbb86b8 | 1322 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
267d66aa | 1323 | |
cc3b9644 FD |
1324 | cond_status = lttng_condition_event_rule_matches_get_rule( |
1325 | condition, &event_rule); | |
a0377dfe FD |
1326 | LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); |
1327 | LTTNG_ASSERT(event_rule); | |
993578ff | 1328 | |
46e9a5fb | 1329 | ua_event_notifier_rule->error_counter_index = |
8dbb86b8 | 1330 | lttng_condition_event_rule_matches_get_error_counter_index(condition); |
267d66aa JR |
1331 | /* Acquire the event notifier's reference to the trigger. */ |
1332 | lttng_trigger_get(trigger); | |
1333 | ||
1334 | ua_event_notifier_rule->trigger = trigger; | |
993578ff JR |
1335 | ua_event_notifier_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule); |
1336 | generate_exclusion_status = lttng_event_rule_generate_exclusions( | |
1337 | event_rule, &ua_event_notifier_rule->exclusion); | |
1338 | switch (generate_exclusion_status) { | |
1339 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK: | |
1340 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE: | |
1341 | break; | |
1342 | default: | |
8f0646a0 | 1343 | /* Error occurred. */ |
267d66aa JR |
1344 | ERR("Failed to generate exclusions from trigger while allocating an event notifier rule"); |
1345 | goto error_put_trigger; | |
993578ff JR |
1346 | } |
1347 | ||
1348 | DBG3("UST app event notifier rule allocated: token = %" PRIu64, | |
1349 | ua_event_notifier_rule->token); | |
1350 | ||
1351 | return ua_event_notifier_rule; | |
1352 | ||
267d66aa JR |
1353 | error_put_trigger: |
1354 | lttng_trigger_put(trigger); | |
993578ff JR |
1355 | error: |
1356 | free(ua_event_notifier_rule); | |
1357 | return NULL; | |
1358 | } | |
1359 | ||
8b366481 DG |
1360 | /* |
1361 | * Alloc new UST app context. | |
1362 | */ | |
1363 | static | |
bdf64013 | 1364 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1365 | { |
1366 | struct ust_app_ctx *ua_ctx; | |
1367 | ||
7966af57 | 1368 | ua_ctx = (ust_app_ctx *) zmalloc(sizeof(struct ust_app_ctx)); |
8b366481 DG |
1369 | if (ua_ctx == NULL) { |
1370 | goto error; | |
1371 | } | |
1372 | ||
31746f93 DG |
1373 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1374 | ||
8b366481 DG |
1375 | if (uctx) { |
1376 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
fc4b93fa | 1377 | if (uctx->ctx == LTTNG_UST_ABI_CONTEXT_APP_CONTEXT) { |
f3db82be | 1378 | char *provider_name = NULL, *ctx_name = NULL; |
bdf64013 JG |
1379 | |
1380 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1381 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1382 | if (!provider_name || !ctx_name) { | |
1383 | free(provider_name); | |
1384 | free(ctx_name); | |
1385 | goto error; | |
1386 | } | |
1387 | ||
1388 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1389 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1390 | } | |
8b366481 DG |
1391 | } |
1392 | ||
1393 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1394 | return ua_ctx; |
bdf64013 JG |
1395 | error: |
1396 | free(ua_ctx); | |
1397 | return NULL; | |
8b366481 DG |
1398 | } |
1399 | ||
51755dc8 JG |
1400 | /* |
1401 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1402 | * | |
1403 | * Return allocated filter or NULL on error. | |
1404 | */ | |
fc4b93fa MD |
1405 | static struct lttng_ust_abi_filter_bytecode *create_ust_filter_bytecode_from_bytecode( |
1406 | const struct lttng_bytecode *orig_f) | |
51755dc8 | 1407 | { |
fc4b93fa | 1408 | struct lttng_ust_abi_filter_bytecode *filter = NULL; |
51755dc8 | 1409 | |
f2eafd2d | 1410 | /* Copy filter bytecode. */ |
7966af57 | 1411 | filter = (lttng_ust_abi_filter_bytecode *) zmalloc(sizeof(*filter) + orig_f->len); |
51755dc8 | 1412 | if (!filter) { |
f2eafd2d | 1413 | PERROR("Failed to allocate lttng_ust_filter_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); |
51755dc8 JG |
1414 | goto error; |
1415 | } | |
1416 | ||
a0377dfe | 1417 | LTTNG_ASSERT(sizeof(struct lttng_bytecode) == |
fc4b93fa | 1418 | sizeof(struct lttng_ust_abi_filter_bytecode)); |
51755dc8 JG |
1419 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); |
1420 | error: | |
1421 | return filter; | |
1422 | } | |
1423 | ||
f2eafd2d JR |
1424 | /* |
1425 | * Create a liblttng-ust capture bytecode from given bytecode. | |
1426 | * | |
1427 | * Return allocated filter or NULL on error. | |
1428 | */ | |
fc4b93fa | 1429 | static struct lttng_ust_abi_capture_bytecode * |
f2eafd2d JR |
1430 | create_ust_capture_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) |
1431 | { | |
fc4b93fa | 1432 | struct lttng_ust_abi_capture_bytecode *capture = NULL; |
f2eafd2d JR |
1433 | |
1434 | /* Copy capture bytecode. */ | |
7966af57 | 1435 | capture = (lttng_ust_abi_capture_bytecode *) zmalloc(sizeof(*capture) + orig_f->len); |
f2eafd2d | 1436 | if (!capture) { |
fc4b93fa | 1437 | PERROR("Failed to allocate lttng_ust_abi_capture_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); |
f2eafd2d JR |
1438 | goto error; |
1439 | } | |
1440 | ||
a0377dfe | 1441 | LTTNG_ASSERT(sizeof(struct lttng_bytecode) == |
fc4b93fa | 1442 | sizeof(struct lttng_ust_abi_capture_bytecode)); |
f2eafd2d JR |
1443 | memcpy(capture, orig_f, sizeof(*capture) + orig_f->len); |
1444 | error: | |
1445 | return capture; | |
1446 | } | |
1447 | ||
099e26bd | 1448 | /* |
421cb601 DG |
1449 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1450 | * held before calling this helper function. | |
099e26bd | 1451 | */ |
f20baf8e | 1452 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1453 | { |
bec39940 | 1454 | struct lttng_ht_node_ulong *node; |
bec39940 | 1455 | struct lttng_ht_iter iter; |
f6a9efaa | 1456 | |
852d0037 | 1457 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1458 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1459 | if (node == NULL) { |
1460 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1461 | goto error; |
1462 | } | |
852d0037 DG |
1463 | |
1464 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1465 | |
1466 | error: | |
1467 | return NULL; | |
099e26bd DG |
1468 | } |
1469 | ||
d0b96690 DG |
1470 | /* |
1471 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1472 | * be held before calling this helper function. | |
1473 | */ | |
1474 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1475 | { | |
1476 | struct lttng_ht_node_ulong *node; | |
1477 | struct lttng_ht_iter iter; | |
1478 | ||
1479 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1480 | &iter); | |
1481 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1482 | if (node == NULL) { | |
1483 | DBG2("UST app find by notify sock %d not found", sock); | |
1484 | goto error; | |
1485 | } | |
1486 | ||
1487 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1488 | ||
1489 | error: | |
1490 | return NULL; | |
1491 | } | |
1492 | ||
025faf73 DG |
1493 | /* |
1494 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1495 | * event loglevel. | |
1496 | * | |
1497 | * Return an ust_app_event object or NULL on error. | |
1498 | */ | |
18eace3b | 1499 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2b00d462 | 1500 | const char *name, const struct lttng_bytecode *filter, |
2106efa0 | 1501 | int loglevel_value, |
39c5a3a7 | 1502 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1503 | { |
1504 | struct lttng_ht_iter iter; | |
1505 | struct lttng_ht_node_str *node; | |
1506 | struct ust_app_event *event = NULL; | |
1507 | struct ust_app_ht_key key; | |
18eace3b | 1508 | |
a0377dfe FD |
1509 | LTTNG_ASSERT(name); |
1510 | LTTNG_ASSERT(ht); | |
18eace3b DG |
1511 | |
1512 | /* Setup key for event lookup. */ | |
1513 | key.name = name; | |
1514 | key.filter = filter; | |
7966af57 | 1515 | key.loglevel_type = (lttng_ust_abi_loglevel_type) loglevel_value; |
39c5a3a7 | 1516 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1517 | key.exclusion = exclusion; |
18eace3b | 1518 | |
025faf73 DG |
1519 | /* Lookup using the event name as hash and a custom match fct. */ |
1520 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1521 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1522 | node = lttng_ht_iter_get_node_str(&iter); |
1523 | if (node == NULL) { | |
1524 | goto end; | |
1525 | } | |
1526 | ||
1527 | event = caa_container_of(node, struct ust_app_event, node); | |
1528 | ||
1529 | end: | |
18eace3b DG |
1530 | return event; |
1531 | } | |
1532 | ||
993578ff JR |
1533 | /* |
1534 | * Look-up an event notifier rule based on its token id. | |
1535 | * | |
1536 | * Must be called with the RCU read lock held. | |
1537 | * Return an ust_app_event_notifier_rule object or NULL on error. | |
1538 | */ | |
1539 | static struct ust_app_event_notifier_rule *find_ust_app_event_notifier_rule( | |
1540 | struct lttng_ht *ht, uint64_t token) | |
1541 | { | |
1542 | struct lttng_ht_iter iter; | |
1543 | struct lttng_ht_node_u64 *node; | |
1544 | struct ust_app_event_notifier_rule *event_notifier_rule = NULL; | |
1545 | ||
a0377dfe | 1546 | LTTNG_ASSERT(ht); |
993578ff JR |
1547 | |
1548 | lttng_ht_lookup(ht, &token, &iter); | |
1549 | node = lttng_ht_iter_get_node_u64(&iter); | |
1550 | if (node == NULL) { | |
1551 | DBG2("UST app event notifier rule token not found: token = %" PRIu64, | |
1552 | token); | |
1553 | goto end; | |
1554 | } | |
1555 | ||
1556 | event_notifier_rule = caa_container_of( | |
1557 | node, struct ust_app_event_notifier_rule, node); | |
1558 | end: | |
1559 | return event_notifier_rule; | |
1560 | } | |
1561 | ||
55cc08a6 DG |
1562 | /* |
1563 | * Create the channel context on the tracer. | |
d0b96690 DG |
1564 | * |
1565 | * Called with UST app session lock held. | |
55cc08a6 DG |
1566 | */ |
1567 | static | |
1568 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1569 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1570 | { | |
1571 | int ret; | |
1572 | ||
840cb59c | 1573 | health_code_update(); |
86acf0da | 1574 | |
fb45065e | 1575 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1576 | ret = lttng_ust_ctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1577 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1578 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1579 | if (ret < 0) { |
be355079 JR |
1580 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1581 | ret = 0; | |
1582 | DBG3("UST app create channel context failed. Application is dead: pid = %d, sock = %d", | |
1583 | app->pid, app->sock); | |
1584 | } else if (ret == -EAGAIN) { | |
3757b385 | 1585 | ret = 0; |
be355079 JR |
1586 | WARN("UST app create channel context failed. Communication time out: pid = %d, sock = %d", |
1587 | app->pid, app->sock); | |
1588 | } else { | |
1589 | ERR("UST app create channel context failed with ret %d: pid = %d, sock = %d", | |
1590 | ret, app->pid, app->sock); | |
ffe60014 | 1591 | } |
55cc08a6 DG |
1592 | goto error; |
1593 | } | |
1594 | ||
1595 | ua_ctx->handle = ua_ctx->obj->handle; | |
1596 | ||
d0b96690 DG |
1597 | DBG2("UST app context handle %d created successfully for channel %s", |
1598 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1599 | |
1600 | error: | |
840cb59c | 1601 | health_code_update(); |
55cc08a6 DG |
1602 | return ret; |
1603 | } | |
1604 | ||
53a80697 MD |
1605 | /* |
1606 | * Set the filter on the tracer. | |
1607 | */ | |
a154c7b8 | 1608 | static int set_ust_object_filter(struct ust_app *app, |
2b00d462 | 1609 | const struct lttng_bytecode *bytecode, |
fc4b93fa | 1610 | struct lttng_ust_abi_object_data *ust_object) |
53a80697 MD |
1611 | { |
1612 | int ret; | |
fc4b93fa | 1613 | struct lttng_ust_abi_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1614 | |
840cb59c | 1615 | health_code_update(); |
86acf0da | 1616 | |
f2eafd2d | 1617 | ust_bytecode = create_ust_filter_bytecode_from_bytecode(bytecode); |
51755dc8 JG |
1618 | if (!ust_bytecode) { |
1619 | ret = -LTTNG_ERR_NOMEM; | |
1620 | goto error; | |
1621 | } | |
fb45065e | 1622 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1623 | ret = lttng_ust_ctl_set_filter(app->sock, ust_bytecode, |
a154c7b8 | 1624 | ust_object); |
fb45065e | 1625 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1626 | if (ret < 0) { |
be355079 | 1627 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3757b385 | 1628 | ret = 0; |
be355079 JR |
1629 | DBG3("UST app set filter failed. Application is dead: pid = %d, sock = %d", |
1630 | app->pid, app->sock); | |
1631 | } else if (ret == -EAGAIN) { | |
1632 | ret = 0; | |
1633 | WARN("UST app set filter failed. Communication time out: pid = %d, sock = %d", | |
1634 | app->pid, app->sock); | |
1635 | } else { | |
1636 | ERR("UST app set filter failed with ret %d: pid = %d, sock = %d, object = %p", | |
1637 | ret, app->pid, app->sock, ust_object); | |
ffe60014 | 1638 | } |
53a80697 MD |
1639 | goto error; |
1640 | } | |
1641 | ||
f2eafd2d JR |
1642 | DBG2("UST filter successfully set: object = %p", ust_object); |
1643 | ||
1644 | error: | |
1645 | health_code_update(); | |
1646 | free(ust_bytecode); | |
1647 | return ret; | |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * Set a capture bytecode for the passed object. | |
11f6ce94 JR |
1652 | * The sequence number enforces the ordering at runtime and on reception of |
1653 | * the captured payloads. | |
f2eafd2d JR |
1654 | */ |
1655 | static int set_ust_capture(struct ust_app *app, | |
1656 | const struct lttng_bytecode *bytecode, | |
11f6ce94 | 1657 | unsigned int capture_seqnum, |
3d1384a4 | 1658 | struct lttng_ust_abi_object_data *ust_object) |
f2eafd2d JR |
1659 | { |
1660 | int ret; | |
fc4b93fa | 1661 | struct lttng_ust_abi_capture_bytecode *ust_bytecode = NULL; |
f2eafd2d JR |
1662 | |
1663 | health_code_update(); | |
1664 | ||
1665 | ust_bytecode = create_ust_capture_bytecode_from_bytecode(bytecode); | |
1666 | if (!ust_bytecode) { | |
1667 | ret = -LTTNG_ERR_NOMEM; | |
1668 | goto error; | |
1669 | } | |
1670 | ||
11f6ce94 JR |
1671 | /* |
1672 | * Set the sequence number to ensure the capture of fields is ordered. | |
1673 | */ | |
1674 | ust_bytecode->seqnum = capture_seqnum; | |
1675 | ||
f2eafd2d | 1676 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1677 | ret = lttng_ust_ctl_set_capture(app->sock, ust_bytecode, |
f2eafd2d JR |
1678 | ust_object); |
1679 | pthread_mutex_unlock(&app->sock_lock); | |
1680 | if (ret < 0) { | |
be355079 JR |
1681 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1682 | ret = 0; | |
1683 | DBG3("UST app set capture failed. Application is dead: pid = %d, sock = %d", | |
1684 | app->pid, app->sock); | |
1685 | } else if (ret == -EAGAIN) { | |
f2eafd2d | 1686 | ret = 0; |
be355079 JR |
1687 | DBG3("UST app set capture failed. Communication timeout: pid = %d, sock = %d", |
1688 | app->pid, app->sock); | |
1689 | } else { | |
1690 | ERR("UST app event set capture failed with ret %d: pid = %d, sock = %d", | |
1691 | ret, app->pid, | |
1692 | app->sock); | |
f2eafd2d JR |
1693 | } |
1694 | ||
1695 | goto error; | |
1696 | } | |
1697 | ||
1698 | DBG2("UST capture successfully set: object = %p", ust_object); | |
53a80697 MD |
1699 | |
1700 | error: | |
840cb59c | 1701 | health_code_update(); |
51755dc8 | 1702 | free(ust_bytecode); |
53a80697 MD |
1703 | return ret; |
1704 | } | |
1705 | ||
51755dc8 | 1706 | static |
fc4b93fa | 1707 | struct lttng_ust_abi_event_exclusion *create_ust_exclusion_from_exclusion( |
c0901ffa | 1708 | const struct lttng_event_exclusion *exclusion) |
51755dc8 | 1709 | { |
fc4b93fa MD |
1710 | struct lttng_ust_abi_event_exclusion *ust_exclusion = NULL; |
1711 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_abi_event_exclusion) + | |
1712 | LTTNG_UST_ABI_SYM_NAME_LEN * exclusion->count; | |
51755dc8 | 1713 | |
7966af57 | 1714 | ust_exclusion = (lttng_ust_abi_event_exclusion *) zmalloc(exclusion_alloc_size); |
51755dc8 JG |
1715 | if (!ust_exclusion) { |
1716 | PERROR("malloc"); | |
1717 | goto end; | |
1718 | } | |
1719 | ||
a0377dfe | 1720 | LTTNG_ASSERT(sizeof(struct lttng_event_exclusion) == |
fc4b93fa | 1721 | sizeof(struct lttng_ust_abi_event_exclusion)); |
51755dc8 JG |
1722 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); |
1723 | end: | |
1724 | return ust_exclusion; | |
1725 | } | |
1726 | ||
7cc9a73c JI |
1727 | /* |
1728 | * Set event exclusions on the tracer. | |
1729 | */ | |
c0901ffa JR |
1730 | static int set_ust_object_exclusions(struct ust_app *app, |
1731 | const struct lttng_event_exclusion *exclusions, | |
fc4b93fa | 1732 | struct lttng_ust_abi_object_data *ust_object) |
7cc9a73c JI |
1733 | { |
1734 | int ret; | |
fc4b93fa | 1735 | struct lttng_ust_abi_event_exclusion *ust_exclusions = NULL; |
7cc9a73c | 1736 | |
a0377dfe | 1737 | LTTNG_ASSERT(exclusions && exclusions->count > 0); |
7cc9a73c | 1738 | |
c0901ffa | 1739 | health_code_update(); |
7cc9a73c | 1740 | |
c0901ffa JR |
1741 | ust_exclusions = create_ust_exclusion_from_exclusion( |
1742 | exclusions); | |
1743 | if (!ust_exclusions) { | |
51755dc8 JG |
1744 | ret = -LTTNG_ERR_NOMEM; |
1745 | goto error; | |
1746 | } | |
fb45065e | 1747 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1748 | ret = lttng_ust_ctl_set_exclusion(app->sock, ust_exclusions, ust_object); |
fb45065e | 1749 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c | 1750 | if (ret < 0) { |
be355079 JR |
1751 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1752 | ret = 0; | |
1753 | DBG3("UST app event exclusion failed. Application is dead: pid = %d, sock = %d", | |
1754 | app->pid, app->sock); | |
1755 | } else if (ret == -EAGAIN) { | |
7cc9a73c | 1756 | ret = 0; |
be355079 JR |
1757 | WARN("UST app event exclusion failed. Communication time out(pid: %d, sock = %d", |
1758 | app->pid, app->sock); | |
1759 | } else { | |
1760 | ERR("UST app event exclusions failed with ret %d: pid = %d, sock = %d, object = %p", | |
1761 | ret, app->pid, app->sock, ust_object); | |
7cc9a73c JI |
1762 | } |
1763 | goto error; | |
1764 | } | |
1765 | ||
c0901ffa | 1766 | DBG2("UST exclusions set successfully for object %p", ust_object); |
7cc9a73c JI |
1767 | |
1768 | error: | |
1769 | health_code_update(); | |
c0901ffa | 1770 | free(ust_exclusions); |
7cc9a73c JI |
1771 | return ret; |
1772 | } | |
1773 | ||
9730260e DG |
1774 | /* |
1775 | * Disable the specified event on to UST tracer for the UST session. | |
1776 | */ | |
e2456d0a | 1777 | static int disable_ust_object(struct ust_app *app, |
fc4b93fa | 1778 | struct lttng_ust_abi_object_data *object) |
9730260e DG |
1779 | { |
1780 | int ret; | |
1781 | ||
840cb59c | 1782 | health_code_update(); |
86acf0da | 1783 | |
fb45065e | 1784 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1785 | ret = lttng_ust_ctl_disable(app->sock, object); |
fb45065e | 1786 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1787 | if (ret < 0) { |
be355079 | 1788 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3757b385 | 1789 | ret = 0; |
be355079 JR |
1790 | DBG3("UST app disable object failed. Application is dead: pid = %d, sock = %d", |
1791 | app->pid, app->sock); | |
1792 | } else if (ret == -EAGAIN) { | |
1793 | ret = 0; | |
1794 | WARN("UST app disable object failed. Communication time out: pid = %d, sock = %d", | |
1795 | app->pid, app->sock); | |
1796 | } else { | |
1797 | ERR("UST app disable object failed with ret %d: pid = %d, sock = %d, object = %p", | |
1798 | ret, app->pid, app->sock, object); | |
ffe60014 | 1799 | } |
9730260e DG |
1800 | goto error; |
1801 | } | |
1802 | ||
be355079 | 1803 | DBG2("UST app object %p disabled successfully for app: pid = %d", |
e2456d0a | 1804 | object, app->pid); |
9730260e DG |
1805 | |
1806 | error: | |
840cb59c | 1807 | health_code_update(); |
9730260e DG |
1808 | return ret; |
1809 | } | |
1810 | ||
78f0bacd DG |
1811 | /* |
1812 | * Disable the specified channel on to UST tracer for the UST session. | |
1813 | */ | |
1814 | static int disable_ust_channel(struct ust_app *app, | |
1815 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1816 | { | |
1817 | int ret; | |
1818 | ||
840cb59c | 1819 | health_code_update(); |
86acf0da | 1820 | |
fb45065e | 1821 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1822 | ret = lttng_ust_ctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1823 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1824 | if (ret < 0) { |
be355079 JR |
1825 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1826 | ret = 0; | |
1827 | DBG3("UST app disable channel failed. Application is dead: pid = %d, sock = %d", | |
1828 | app->pid, app->sock); | |
1829 | } else if (ret == -EAGAIN) { | |
3757b385 | 1830 | ret = 0; |
be355079 JR |
1831 | WARN("UST app disable channel failed. Communication time out: pid = %d, sock = %d", |
1832 | app->pid, app->sock); | |
1833 | } else { | |
1834 | ERR("UST app channel %s disable failed, session handle %d, with ret %d: pid = %d, sock = %d", | |
1835 | ua_chan->name, ua_sess->handle, ret, | |
1836 | app->pid, app->sock); | |
ffe60014 | 1837 | } |
78f0bacd DG |
1838 | goto error; |
1839 | } | |
1840 | ||
be355079 | 1841 | DBG2("UST app channel %s disabled successfully for app: pid = %d", |
852d0037 | 1842 | ua_chan->name, app->pid); |
78f0bacd DG |
1843 | |
1844 | error: | |
840cb59c | 1845 | health_code_update(); |
78f0bacd DG |
1846 | return ret; |
1847 | } | |
1848 | ||
1849 | /* | |
1850 | * Enable the specified channel on to UST tracer for the UST session. | |
1851 | */ | |
1852 | static int enable_ust_channel(struct ust_app *app, | |
1853 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1854 | { | |
1855 | int ret; | |
1856 | ||
840cb59c | 1857 | health_code_update(); |
86acf0da | 1858 | |
fb45065e | 1859 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1860 | ret = lttng_ust_ctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1861 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1862 | if (ret < 0) { |
be355079 JR |
1863 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1864 | ret = 0; | |
1865 | DBG3("UST app channel %s enable failed. Application is dead: pid = %d, sock = %d", | |
1866 | ua_chan->name, app->pid, app->sock); | |
1867 | } else if (ret == -EAGAIN) { | |
3757b385 | 1868 | ret = 0; |
be355079 JR |
1869 | WARN("UST app channel %s enable failed. Communication time out: pid = %d, sock = %d", |
1870 | ua_chan->name, app->pid, app->sock); | |
1871 | } else { | |
1872 | ERR("UST app channel %s enable failed, session handle %d, with ret %d: pid = %d, sock = %d", | |
1873 | ua_chan->name, ua_sess->handle, ret, | |
1874 | app->pid, app->sock); | |
ffe60014 | 1875 | } |
78f0bacd DG |
1876 | goto error; |
1877 | } | |
1878 | ||
1879 | ua_chan->enabled = 1; | |
1880 | ||
be355079 | 1881 | DBG2("UST app channel %s enabled successfully for app: pid = %d", |
852d0037 | 1882 | ua_chan->name, app->pid); |
78f0bacd DG |
1883 | |
1884 | error: | |
840cb59c | 1885 | health_code_update(); |
78f0bacd DG |
1886 | return ret; |
1887 | } | |
1888 | ||
edb67388 DG |
1889 | /* |
1890 | * Enable the specified event on to UST tracer for the UST session. | |
1891 | */ | |
3428a1b7 | 1892 | static int enable_ust_object( |
fc4b93fa | 1893 | struct ust_app *app, struct lttng_ust_abi_object_data *ust_object) |
edb67388 DG |
1894 | { |
1895 | int ret; | |
1896 | ||
840cb59c | 1897 | health_code_update(); |
86acf0da | 1898 | |
fb45065e | 1899 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1900 | ret = lttng_ust_ctl_enable(app->sock, ust_object); |
fb45065e | 1901 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1902 | if (ret < 0) { |
be355079 | 1903 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3757b385 | 1904 | ret = 0; |
be355079 JR |
1905 | DBG3("UST app enable object failed. Application is dead: pid = %d, sock = %d", |
1906 | app->pid, app->sock); | |
1907 | } else if (ret == -EAGAIN) { | |
1908 | ret = 0; | |
1909 | WARN("UST app enable object failed. Communication time out: pid = %d, sock = %d", | |
1910 | app->pid, app->sock); | |
1911 | } else { | |
1912 | ERR("UST app enable object failed with ret %d: pid = %d, sock = %d, object = %p", | |
1913 | ret, app->pid, app->sock, ust_object); | |
ffe60014 | 1914 | } |
edb67388 DG |
1915 | goto error; |
1916 | } | |
1917 | ||
be355079 | 1918 | DBG2("UST app object %p enabled successfully for app: pid = %d", |
3428a1b7 | 1919 | ust_object, app->pid); |
edb67388 DG |
1920 | |
1921 | error: | |
840cb59c | 1922 | health_code_update(); |
edb67388 DG |
1923 | return ret; |
1924 | } | |
1925 | ||
099e26bd | 1926 | /* |
7972aab2 | 1927 | * Send channel and stream buffer to application. |
4f3ab6ee | 1928 | * |
ffe60014 | 1929 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1930 | */ |
7972aab2 DG |
1931 | static int send_channel_pid_to_ust(struct ust_app *app, |
1932 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1933 | { |
1934 | int ret; | |
ffe60014 | 1935 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee | 1936 | |
a0377dfe FD |
1937 | LTTNG_ASSERT(app); |
1938 | LTTNG_ASSERT(ua_sess); | |
1939 | LTTNG_ASSERT(ua_chan); | |
4f3ab6ee | 1940 | |
840cb59c | 1941 | health_code_update(); |
4f3ab6ee | 1942 | |
7972aab2 DG |
1943 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1944 | app->sock); | |
86acf0da | 1945 | |
ffe60014 DG |
1946 | /* Send channel to the application. */ |
1947 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1948 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1949 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1950 | goto error; | |
be355079 JR |
1951 | } else if (ret == -EAGAIN) { |
1952 | /* Caused by timeout. */ | |
1953 | WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".", | |
1954 | app->pid, ua_chan->name, ua_sess->tracing_id); | |
1955 | /* Treat this the same way as an application that is exiting. */ | |
1956 | ret = -ENOTCONN; | |
1957 | goto error; | |
a7169585 | 1958 | } else if (ret < 0) { |
b551a063 DG |
1959 | goto error; |
1960 | } | |
1961 | ||
d88aee68 DG |
1962 | health_code_update(); |
1963 | ||
ffe60014 DG |
1964 | /* Send all streams to application. */ |
1965 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1966 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 | 1967 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
be355079 | 1968 | ret = -ENOTCONN; /* Caused by app exiting. */ |
a7169585 | 1969 | goto error; |
be355079 JR |
1970 | } else if (ret == -EAGAIN) { |
1971 | /* Caused by timeout. */ | |
1972 | WARN("Communication with application %d timed out on send_stream for stream \"%s\" of channel \"%s\" of session \"%" PRIu64 "\".", | |
1973 | app->pid, stream->name, ua_chan->name, | |
1974 | ua_sess->tracing_id); | |
acfb63a8 JR |
1975 | /* |
1976 | * Treat this the same way as an application that is | |
1977 | * exiting. | |
1978 | */ | |
be355079 | 1979 | ret = -ENOTCONN; |
a7169585 | 1980 | } else if (ret < 0) { |
ffe60014 DG |
1981 | goto error; |
1982 | } | |
1983 | /* We don't need the stream anymore once sent to the tracer. */ | |
1984 | cds_list_del(&stream->list); | |
fb45065e | 1985 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1986 | } |
ffe60014 DG |
1987 | /* Flag the channel that it is sent to the application. */ |
1988 | ua_chan->is_sent = 1; | |
ffe60014 | 1989 | |
b551a063 | 1990 | error: |
840cb59c | 1991 | health_code_update(); |
b551a063 DG |
1992 | return ret; |
1993 | } | |
1994 | ||
91d76f53 | 1995 | /* |
5b4a0ec0 | 1996 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1997 | * |
1998 | * Should be called with session mutex held. | |
91d76f53 | 1999 | */ |
edb67388 DG |
2000 | static |
2001 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
2002 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 2003 | { |
5b4a0ec0 | 2004 | int ret = 0; |
284d8f55 | 2005 | |
840cb59c | 2006 | health_code_update(); |
86acf0da | 2007 | |
5b4a0ec0 | 2008 | /* Create UST event on tracer */ |
fb45065e | 2009 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 2010 | ret = lttng_ust_ctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 2011 | &ua_event->obj); |
fb45065e | 2012 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 2013 | if (ret < 0) { |
be355079 JR |
2014 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2015 | ret = 0; | |
2016 | DBG3("UST app create event failed. Application is dead: pid = %d, sock = %d", | |
2017 | app->pid, app->sock); | |
2018 | } else if (ret == -EAGAIN) { | |
3757b385 | 2019 | ret = 0; |
be355079 JR |
2020 | WARN("UST app create event failed. Communication time out: pid = %d, sock = %d", |
2021 | app->pid, app->sock); | |
2022 | } else { | |
2023 | ERR("UST app create event '%s' failed with ret %d: pid = %d, sock = %d", | |
2024 | ua_event->attr.name, ret, app->pid, | |
2025 | app->sock); | |
ffe60014 | 2026 | } |
5b4a0ec0 | 2027 | goto error; |
91d76f53 | 2028 | } |
f6a9efaa | 2029 | |
5b4a0ec0 | 2030 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 2031 | |
be355079 | 2032 | DBG2("UST app event %s created successfully for pid:%d object = %p", |
3428a1b7 | 2033 | ua_event->attr.name, app->pid, ua_event->obj); |
f6a9efaa | 2034 | |
840cb59c | 2035 | health_code_update(); |
86acf0da | 2036 | |
025faf73 DG |
2037 | /* Set filter if one is present. */ |
2038 | if (ua_event->filter) { | |
a154c7b8 | 2039 | ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj); |
025faf73 DG |
2040 | if (ret < 0) { |
2041 | goto error; | |
2042 | } | |
2043 | } | |
2044 | ||
7cc9a73c JI |
2045 | /* Set exclusions for the event */ |
2046 | if (ua_event->exclusion) { | |
c0901ffa | 2047 | ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj); |
7cc9a73c JI |
2048 | if (ret < 0) { |
2049 | goto error; | |
2050 | } | |
2051 | } | |
2052 | ||
8535a6d9 | 2053 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
2054 | if (ua_event->enabled) { |
2055 | /* | |
2056 | * We now need to explicitly enable the event, since it | |
2057 | * is now disabled at creation. | |
2058 | */ | |
3428a1b7 | 2059 | ret = enable_ust_object(app, ua_event->obj); |
40113787 MD |
2060 | if (ret < 0) { |
2061 | /* | |
2062 | * If we hit an EPERM, something is wrong with our enable call. If | |
2063 | * we get an EEXIST, there is a problem on the tracer side since we | |
2064 | * just created it. | |
2065 | */ | |
2066 | switch (ret) { | |
2067 | case -LTTNG_UST_ERR_PERM: | |
2068 | /* Code flow problem */ | |
a0377dfe | 2069 | abort(); |
40113787 MD |
2070 | case -LTTNG_UST_ERR_EXIST: |
2071 | /* It's OK for our use case. */ | |
2072 | ret = 0; | |
2073 | break; | |
2074 | default: | |
2075 | break; | |
2076 | } | |
2077 | goto error; | |
2078 | } | |
8535a6d9 DG |
2079 | } |
2080 | ||
5b4a0ec0 | 2081 | error: |
840cb59c | 2082 | health_code_update(); |
5b4a0ec0 | 2083 | return ret; |
91d76f53 | 2084 | } |
48842b30 | 2085 | |
993578ff JR |
2086 | static int init_ust_event_notifier_from_event_rule( |
2087 | const struct lttng_event_rule *rule, | |
fc4b93fa | 2088 | struct lttng_ust_abi_event_notifier *event_notifier) |
993578ff JR |
2089 | { |
2090 | enum lttng_event_rule_status status; | |
fc4b93fa | 2091 | enum lttng_ust_abi_loglevel_type ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
993578ff JR |
2092 | int loglevel = -1, ret = 0; |
2093 | const char *pattern; | |
2094 | ||
993578ff JR |
2095 | |
2096 | memset(event_notifier, 0, sizeof(*event_notifier)); | |
2097 | ||
44760c20 JR |
2098 | if (lttng_event_rule_targets_agent_domain(rule)) { |
2099 | /* | |
2100 | * Special event for agents | |
2101 | * The actual meat of the event is in the filter that will be | |
2102 | * attached later on. | |
2103 | * Set the default values for the agent event. | |
2104 | */ | |
2105 | pattern = event_get_default_agent_ust_name( | |
2106 | lttng_event_rule_get_domain_type(rule)); | |
2107 | loglevel = 0; | |
fc4b93fa | 2108 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
44760c20 | 2109 | } else { |
85b05318 | 2110 | const struct lttng_log_level_rule *log_level_rule; |
993578ff | 2111 | |
a0377dfe | 2112 | LTTNG_ASSERT(lttng_event_rule_get_type(rule) == |
695f7044 JR |
2113 | LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT); |
2114 | ||
2115 | status = lttng_event_rule_user_tracepoint_get_name_pattern(rule, &pattern); | |
44760c20 JR |
2116 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
2117 | /* At this point, this is a fatal error. */ | |
2118 | abort(); | |
2119 | } | |
993578ff | 2120 | |
695f7044 | 2121 | status = lttng_event_rule_user_tracepoint_get_log_level_rule( |
85b05318 JR |
2122 | rule, &log_level_rule); |
2123 | if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { | |
fc4b93fa | 2124 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
85b05318 JR |
2125 | } else if (status == LTTNG_EVENT_RULE_STATUS_OK) { |
2126 | enum lttng_log_level_rule_status llr_status; | |
2127 | ||
2128 | switch (lttng_log_level_rule_get_type(log_level_rule)) { | |
2129 | case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY: | |
2130 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_SINGLE; | |
2131 | llr_status = lttng_log_level_rule_exactly_get_level( | |
2132 | log_level_rule, &loglevel); | |
2133 | break; | |
2134 | case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS: | |
2135 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_RANGE; | |
2136 | llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level( | |
2137 | log_level_rule, &loglevel); | |
2138 | break; | |
2139 | default: | |
2140 | abort(); | |
2141 | } | |
993578ff | 2142 | |
a0377dfe | 2143 | LTTNG_ASSERT(llr_status == LTTNG_LOG_LEVEL_RULE_STATUS_OK); |
85b05318 JR |
2144 | } else { |
2145 | /* At this point this is a fatal error. */ | |
2146 | abort(); | |
44760c20 | 2147 | } |
993578ff JR |
2148 | } |
2149 | ||
fc4b93fa | 2150 | event_notifier->event.instrumentation = LTTNG_UST_ABI_TRACEPOINT; |
993578ff | 2151 | ret = lttng_strncpy(event_notifier->event.name, pattern, |
fc4b93fa | 2152 | LTTNG_UST_ABI_SYM_NAME_LEN - 1); |
993578ff JR |
2153 | if (ret) { |
2154 | ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ", | |
2155 | pattern); | |
2156 | goto end; | |
2157 | } | |
2158 | ||
2159 | event_notifier->event.loglevel_type = ust_loglevel_type; | |
2160 | event_notifier->event.loglevel = loglevel; | |
2161 | end: | |
2162 | return ret; | |
2163 | } | |
2164 | ||
2165 | /* | |
2166 | * Create the specified event notifier against the user space tracer of a | |
2167 | * given application. | |
2168 | */ | |
2169 | static int create_ust_event_notifier(struct ust_app *app, | |
2170 | struct ust_app_event_notifier_rule *ua_event_notifier_rule) | |
2171 | { | |
2172 | int ret = 0; | |
267d66aa JR |
2173 | enum lttng_condition_status condition_status; |
2174 | const struct lttng_condition *condition = NULL; | |
fc4b93fa | 2175 | struct lttng_ust_abi_event_notifier event_notifier; |
267d66aa | 2176 | const struct lttng_event_rule *event_rule = NULL; |
f83be61d JR |
2177 | unsigned int capture_bytecode_count = 0, i; |
2178 | enum lttng_condition_status cond_status; | |
695f7044 | 2179 | enum lttng_event_rule_type event_rule_type; |
993578ff JR |
2180 | |
2181 | health_code_update(); | |
a0377dfe | 2182 | LTTNG_ASSERT(app->event_notifier_group.object); |
993578ff | 2183 | |
267d66aa JR |
2184 | condition = lttng_trigger_get_const_condition( |
2185 | ua_event_notifier_rule->trigger); | |
a0377dfe FD |
2186 | LTTNG_ASSERT(condition); |
2187 | LTTNG_ASSERT(lttng_condition_get_type(condition) == | |
8dbb86b8 | 2188 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
993578ff | 2189 | |
8dbb86b8 | 2190 | condition_status = lttng_condition_event_rule_matches_get_rule( |
d602bd6a | 2191 | condition, &event_rule); |
a0377dfe | 2192 | LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); |
d602bd6a | 2193 | |
a0377dfe | 2194 | LTTNG_ASSERT(event_rule); |
695f7044 JR |
2195 | |
2196 | event_rule_type = lttng_event_rule_get_type(event_rule); | |
a0377dfe | 2197 | LTTNG_ASSERT(event_rule_type == LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT || |
695f7044 JR |
2198 | event_rule_type == LTTNG_EVENT_RULE_TYPE_JUL_LOGGING || |
2199 | event_rule_type == | |
2200 | LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING || | |
2201 | event_rule_type == | |
2202 | LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING); | |
267d66aa JR |
2203 | |
2204 | init_ust_event_notifier_from_event_rule(event_rule, &event_notifier); | |
993578ff | 2205 | event_notifier.event.token = ua_event_notifier_rule->token; |
533a90fb | 2206 | event_notifier.error_counter_index = ua_event_notifier_rule->error_counter_index; |
993578ff JR |
2207 | |
2208 | /* Create UST event notifier against the tracer. */ | |
2209 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 2210 | ret = lttng_ust_ctl_create_event_notifier(app->sock, &event_notifier, |
993578ff JR |
2211 | app->event_notifier_group.object, |
2212 | &ua_event_notifier_rule->obj); | |
2213 | pthread_mutex_unlock(&app->sock_lock); | |
2214 | if (ret < 0) { | |
be355079 | 2215 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
993578ff | 2216 | ret = 0; |
be355079 JR |
2217 | DBG3("UST app create event notifier failed. Application is dead: pid = %d, sock = %d", |
2218 | app->pid, app->sock); | |
2219 | } else if (ret == -EAGAIN) { | |
2220 | ret = 0; | |
2221 | WARN("UST app create event notifier failed. Communication time out: pid = %d, sock = %d", | |
2222 | app->pid, app->sock); | |
2223 | } else { | |
2224 | ERR("UST app create event notifier '%s' failed with ret %d: pid = %d, sock = %d", | |
2225 | event_notifier.event.name, ret, app->pid, | |
2226 | app->sock); | |
993578ff | 2227 | } |
993578ff JR |
2228 | goto error; |
2229 | } | |
2230 | ||
2231 | ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle; | |
2232 | ||
9324443a | 2233 | DBG2("UST app event notifier %s created successfully: app = '%s': pid = %d, object = %p", |
be355079 | 2234 | event_notifier.event.name, app->name, app->pid, |
993578ff JR |
2235 | ua_event_notifier_rule->obj); |
2236 | ||
2237 | health_code_update(); | |
2238 | ||
2239 | /* Set filter if one is present. */ | |
2240 | if (ua_event_notifier_rule->filter) { | |
2241 | ret = set_ust_object_filter(app, ua_event_notifier_rule->filter, | |
2242 | ua_event_notifier_rule->obj); | |
2243 | if (ret < 0) { | |
2244 | goto error; | |
2245 | } | |
2246 | } | |
2247 | ||
2248 | /* Set exclusions for the event. */ | |
2249 | if (ua_event_notifier_rule->exclusion) { | |
2250 | ret = set_ust_object_exclusions(app, | |
2251 | ua_event_notifier_rule->exclusion, | |
2252 | ua_event_notifier_rule->obj); | |
2253 | if (ret < 0) { | |
2254 | goto error; | |
2255 | } | |
2256 | } | |
f83be61d JR |
2257 | |
2258 | /* Set the capture bytecodes. */ | |
8dbb86b8 | 2259 | cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( |
f83be61d | 2260 | condition, &capture_bytecode_count); |
a0377dfe | 2261 | LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); |
f83be61d JR |
2262 | |
2263 | for (i = 0; i < capture_bytecode_count; i++) { | |
2264 | const struct lttng_bytecode *capture_bytecode = | |
8dbb86b8 | 2265 | lttng_condition_event_rule_matches_get_capture_bytecode_at_index( |
f83be61d JR |
2266 | condition, i); |
2267 | ||
11f6ce94 | 2268 | ret = set_ust_capture(app, capture_bytecode, i, |
f83be61d JR |
2269 | ua_event_notifier_rule->obj); |
2270 | if (ret < 0) { | |
2271 | goto error; | |
2272 | } | |
2273 | } | |
993578ff JR |
2274 | |
2275 | /* | |
2276 | * We now need to explicitly enable the event, since it | |
2277 | * is disabled at creation. | |
2278 | */ | |
2279 | ret = enable_ust_object(app, ua_event_notifier_rule->obj); | |
2280 | if (ret < 0) { | |
2281 | /* | |
2282 | * If we hit an EPERM, something is wrong with our enable call. | |
2283 | * If we get an EEXIST, there is a problem on the tracer side | |
2284 | * since we just created it. | |
2285 | */ | |
2286 | switch (ret) { | |
2287 | case -LTTNG_UST_ERR_PERM: | |
2288 | /* Code flow problem. */ | |
2289 | abort(); | |
2290 | case -LTTNG_UST_ERR_EXIST: | |
2291 | /* It's OK for our use case. */ | |
2292 | ret = 0; | |
2293 | break; | |
2294 | default: | |
2295 | break; | |
2296 | } | |
2297 | ||
2298 | goto error; | |
2299 | } | |
2300 | ||
2301 | ua_event_notifier_rule->enabled = true; | |
2302 | ||
2303 | error: | |
2304 | health_code_update(); | |
2305 | return ret; | |
2306 | } | |
2307 | ||
5b4a0ec0 DG |
2308 | /* |
2309 | * Copy data between an UST app event and a LTT event. | |
2310 | */ | |
421cb601 | 2311 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
2312 | struct ltt_ust_event *uevent) |
2313 | { | |
b4ffad32 JI |
2314 | size_t exclusion_alloc_size; |
2315 | ||
48842b30 DG |
2316 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
2317 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
2318 | ||
fc34caaa DG |
2319 | ua_event->enabled = uevent->enabled; |
2320 | ||
5b4a0ec0 DG |
2321 | /* Copy event attributes */ |
2322 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
2323 | ||
53a80697 MD |
2324 | /* Copy filter bytecode */ |
2325 | if (uevent->filter) { | |
2b00d462 | 2326 | ua_event->filter = lttng_bytecode_copy(uevent->filter); |
025faf73 | 2327 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2328 | } |
b4ffad32 JI |
2329 | |
2330 | /* Copy exclusion data */ | |
2331 | if (uevent->exclusion) { | |
51755dc8 | 2332 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
fc4b93fa | 2333 | LTTNG_UST_ABI_SYM_NAME_LEN * uevent->exclusion->count; |
7966af57 | 2334 | ua_event->exclusion = (lttng_event_exclusion *) zmalloc(exclusion_alloc_size); |
5f8df26c JI |
2335 | if (ua_event->exclusion == NULL) { |
2336 | PERROR("malloc"); | |
2337 | } else { | |
2338 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2339 | exclusion_alloc_size); | |
b4ffad32 JI |
2340 | } |
2341 | } | |
48842b30 DG |
2342 | } |
2343 | ||
5b4a0ec0 DG |
2344 | /* |
2345 | * Copy data between an UST app channel and a LTT channel. | |
2346 | */ | |
421cb601 | 2347 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2348 | struct ltt_ust_channel *uchan) |
2349 | { | |
fc34caaa | 2350 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2351 | |
2352 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2353 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2354 | |
1624d5b7 JD |
2355 | ua_chan->tracefile_size = uchan->tracefile_size; |
2356 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2357 | ||
ffe60014 DG |
2358 | /* Copy event attributes since the layout is different. */ |
2359 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2360 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2361 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2362 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2363 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2364 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
7966af57 | 2365 | ua_chan->attr.output = (lttng_ust_abi_output) uchan->attr.output; |
491d1539 MD |
2366 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2367 | ||
ffe60014 DG |
2368 | /* |
2369 | * Note that the attribute channel type is not set since the channel on the | |
2370 | * tracing registry side does not have this information. | |
2371 | */ | |
48842b30 | 2372 | |
fc34caaa | 2373 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2374 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2375 | |
fc34caaa | 2376 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2377 | } |
2378 | ||
5b4a0ec0 DG |
2379 | /* |
2380 | * Copy data between a UST app session and a regular LTT session. | |
2381 | */ | |
421cb601 | 2382 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2383 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2384 | { |
477d7741 MD |
2385 | struct tm *timeinfo; |
2386 | char datetime[16]; | |
2387 | int ret; | |
d7ba1388 | 2388 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2389 | |
940c4592 | 2390 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2391 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2392 | |
421cb601 | 2393 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2394 | |
7972aab2 DG |
2395 | ua_sess->tracing_id = usess->id; |
2396 | ua_sess->id = get_next_session_id(); | |
ff588497 JR |
2397 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); |
2398 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); | |
2399 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); | |
2400 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); | |
7972aab2 DG |
2401 | ua_sess->buffer_type = usess->buffer_type; |
2402 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2403 | |
7972aab2 | 2404 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2405 | consumer_output_get(usess->consumer); |
7972aab2 | 2406 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2407 | |
2bba9e53 | 2408 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2409 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2410 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2411 | &usess->metadata_attr); | |
7972aab2 DG |
2412 | |
2413 | switch (ua_sess->buffer_type) { | |
2414 | case LTTNG_BUFFER_PER_PID: | |
2415 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2416 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2417 | datetime); |
2418 | break; | |
2419 | case LTTNG_BUFFER_PER_UID: | |
2420 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 | 2421 | DEFAULT_UST_TRACE_UID_PATH, |
ff588497 | 2422 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
470cc211 | 2423 | app->bits_per_long); |
7972aab2 DG |
2424 | break; |
2425 | default: | |
a0377dfe | 2426 | abort(); |
7972aab2 DG |
2427 | goto error; |
2428 | } | |
477d7741 MD |
2429 | if (ret < 0) { |
2430 | PERROR("asprintf UST shadow copy session"); | |
a0377dfe | 2431 | abort(); |
7972aab2 | 2432 | goto error; |
477d7741 MD |
2433 | } |
2434 | ||
3d071855 MD |
2435 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2436 | sizeof(ua_sess->root_shm_path)); | |
2437 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2438 | strncpy(ua_sess->shm_path, usess->shm_path, |
2439 | sizeof(ua_sess->shm_path)); | |
2440 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2441 | if (ua_sess->shm_path[0]) { | |
2442 | switch (ua_sess->buffer_type) { | |
2443 | case LTTNG_BUFFER_PER_PID: | |
2444 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2445 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2446 | app->name, app->pid, datetime); |
2447 | break; | |
2448 | case LTTNG_BUFFER_PER_UID: | |
2449 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2450 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2451 | app->uid, app->bits_per_long); |
2452 | break; | |
2453 | default: | |
a0377dfe | 2454 | abort(); |
d7ba1388 MD |
2455 | goto error; |
2456 | } | |
2457 | if (ret < 0) { | |
2458 | PERROR("sprintf UST shadow copy session"); | |
a0377dfe | 2459 | abort(); |
d7ba1388 MD |
2460 | goto error; |
2461 | } | |
2462 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2463 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2464 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2465 | } | |
6addfa37 | 2466 | return; |
7972aab2 DG |
2467 | |
2468 | error: | |
6addfa37 | 2469 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2470 | } |
2471 | ||
78f0bacd DG |
2472 | /* |
2473 | * Lookup sesison wrapper. | |
2474 | */ | |
84cd17c6 | 2475 | static |
fb9a95c4 | 2476 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2477 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2478 | { |
2479 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2480 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2481 | } |
2482 | ||
421cb601 DG |
2483 | /* |
2484 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2485 | * id. |
421cb601 | 2486 | */ |
48842b30 | 2487 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2488 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2489 | { |
bec39940 | 2490 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2491 | struct lttng_ht_node_u64 *node; |
48842b30 | 2492 | |
84cd17c6 | 2493 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2494 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2495 | if (node == NULL) { |
2496 | goto error; | |
2497 | } | |
2498 | ||
2499 | return caa_container_of(node, struct ust_app_session, node); | |
2500 | ||
2501 | error: | |
2502 | return NULL; | |
2503 | } | |
2504 | ||
7972aab2 DG |
2505 | /* |
2506 | * Setup buffer registry per PID for the given session and application. If none | |
2507 | * is found, a new one is created, added to the global registry and | |
2508 | * initialized. If regp is valid, it's set with the newly created object. | |
2509 | * | |
2510 | * Return 0 on success or else a negative value. | |
2511 | */ | |
2512 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2513 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2514 | { | |
2515 | int ret = 0; | |
2516 | struct buffer_reg_pid *reg_pid; | |
2517 | ||
a0377dfe FD |
2518 | LTTNG_ASSERT(ua_sess); |
2519 | LTTNG_ASSERT(app); | |
7972aab2 DG |
2520 | |
2521 | rcu_read_lock(); | |
2522 | ||
2523 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2524 | if (!reg_pid) { | |
2525 | /* | |
2526 | * This is the create channel path meaning that if there is NO | |
2527 | * registry available, we have to create one for this session. | |
2528 | */ | |
d7ba1388 | 2529 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2530 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2531 | if (ret < 0) { |
2532 | goto error; | |
2533 | } | |
7972aab2 DG |
2534 | } else { |
2535 | goto end; | |
2536 | } | |
2537 | ||
2538 | /* Initialize registry. */ | |
2539 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2540 | app->bits_per_long, app->uint8_t_alignment, | |
2541 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2542 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2543 | app->byte_order, app->version.major, app->version.minor, |
2544 | reg_pid->root_shm_path, reg_pid->shm_path, | |
ff588497 JR |
2545 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
2546 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
2547 | ua_sess->tracing_id, | |
8de88061 | 2548 | app->uid); |
7972aab2 | 2549 | if (ret < 0) { |
286c991a MD |
2550 | /* |
2551 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2552 | * destroy the buffer registry, because it is always expected | |
2553 | * that if the buffer registry can be found, its ust registry is | |
2554 | * non-NULL. | |
2555 | */ | |
2556 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2557 | goto error; |
2558 | } | |
2559 | ||
286c991a MD |
2560 | buffer_reg_pid_add(reg_pid); |
2561 | ||
7972aab2 DG |
2562 | DBG3("UST app buffer registry per PID created successfully"); |
2563 | ||
2564 | end: | |
2565 | if (regp) { | |
2566 | *regp = reg_pid; | |
2567 | } | |
2568 | error: | |
2569 | rcu_read_unlock(); | |
2570 | return ret; | |
2571 | } | |
2572 | ||
2573 | /* | |
2574 | * Setup buffer registry per UID for the given session and application. If none | |
2575 | * is found, a new one is created, added to the global registry and | |
2576 | * initialized. If regp is valid, it's set with the newly created object. | |
2577 | * | |
2578 | * Return 0 on success or else a negative value. | |
2579 | */ | |
2580 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2581 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2582 | struct ust_app *app, struct buffer_reg_uid **regp) |
2583 | { | |
2584 | int ret = 0; | |
2585 | struct buffer_reg_uid *reg_uid; | |
2586 | ||
a0377dfe FD |
2587 | LTTNG_ASSERT(usess); |
2588 | LTTNG_ASSERT(app); | |
7972aab2 DG |
2589 | |
2590 | rcu_read_lock(); | |
2591 | ||
2592 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2593 | if (!reg_uid) { | |
2594 | /* | |
2595 | * This is the create channel path meaning that if there is NO | |
2596 | * registry available, we have to create one for this session. | |
2597 | */ | |
2598 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2599 | LTTNG_DOMAIN_UST, ®_uid, |
2600 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2601 | if (ret < 0) { |
2602 | goto error; | |
2603 | } | |
7972aab2 DG |
2604 | } else { |
2605 | goto end; | |
2606 | } | |
2607 | ||
2608 | /* Initialize registry. */ | |
af6142cf | 2609 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2610 | app->bits_per_long, app->uint8_t_alignment, |
2611 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2612 | app->uint64_t_alignment, app->long_alignment, |
2613 | app->byte_order, app->version.major, | |
3d071855 | 2614 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2615 | reg_uid->shm_path, usess->uid, usess->gid, |
2616 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2617 | if (ret < 0) { |
286c991a MD |
2618 | /* |
2619 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2620 | * destroy the buffer registry, because it is always expected | |
2621 | * that if the buffer registry can be found, its ust registry is | |
2622 | * non-NULL. | |
2623 | */ | |
2624 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2625 | goto error; |
2626 | } | |
2627 | /* Add node to teardown list of the session. */ | |
2628 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2629 | ||
286c991a | 2630 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2631 | |
286c991a | 2632 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2633 | end: |
2634 | if (regp) { | |
2635 | *regp = reg_uid; | |
2636 | } | |
2637 | error: | |
2638 | rcu_read_unlock(); | |
2639 | return ret; | |
2640 | } | |
2641 | ||
421cb601 | 2642 | /* |
3d8ca23b | 2643 | * Create a session on the tracer side for the given app. |
421cb601 | 2644 | * |
3d8ca23b DG |
2645 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2646 | * untouched. If the session was created, is_created is set to 1. On error, | |
2647 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2648 | * be NULL. | |
2649 | * | |
2650 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
b623cb6a | 2651 | * -ENOTCONN which is the default code if the lttng_ust_ctl_create_session fails. |
421cb601 | 2652 | */ |
03f91eaa | 2653 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2654 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2655 | int *is_created) | |
421cb601 | 2656 | { |
3d8ca23b | 2657 | int ret, created = 0; |
421cb601 DG |
2658 | struct ust_app_session *ua_sess; |
2659 | ||
a0377dfe FD |
2660 | LTTNG_ASSERT(usess); |
2661 | LTTNG_ASSERT(app); | |
2662 | LTTNG_ASSERT(ua_sess_ptr); | |
3d8ca23b | 2663 | |
840cb59c | 2664 | health_code_update(); |
86acf0da | 2665 | |
421cb601 DG |
2666 | ua_sess = lookup_session_by_app(usess, app); |
2667 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2668 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2669 | app->pid, usess->id); |
40bbd087 | 2670 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2671 | if (ua_sess == NULL) { |
2672 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2673 | ret = -ENOMEM; |
2674 | goto error; | |
421cb601 | 2675 | } |
477d7741 | 2676 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2677 | created = 1; |
421cb601 DG |
2678 | } |
2679 | ||
7972aab2 DG |
2680 | switch (usess->buffer_type) { |
2681 | case LTTNG_BUFFER_PER_PID: | |
2682 | /* Init local registry. */ | |
2683 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2684 | if (ret < 0) { |
e64207cf | 2685 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2686 | goto error; |
2687 | } | |
2688 | break; | |
2689 | case LTTNG_BUFFER_PER_UID: | |
2690 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2691 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2692 | if (ret < 0) { |
e64207cf | 2693 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2694 | goto error; |
2695 | } | |
2696 | break; | |
2697 | default: | |
a0377dfe | 2698 | abort(); |
7972aab2 DG |
2699 | ret = -EINVAL; |
2700 | goto error; | |
2701 | } | |
2702 | ||
2703 | health_code_update(); | |
2704 | ||
2705 | if (ua_sess->handle == -1) { | |
fb45065e | 2706 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 2707 | ret = lttng_ust_ctl_create_session(app->sock); |
fb45065e | 2708 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 | 2709 | if (ret < 0) { |
be355079 JR |
2710 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2711 | DBG("UST app creating session failed. Application is dead: pid = %d, sock = %d", | |
2712 | app->pid, app->sock); | |
2713 | ret = 0; | |
2714 | } else if (ret == -EAGAIN) { | |
2715 | DBG("UST app creating session failed. Communication time out: pid = %d, sock = %d", | |
2716 | app->pid, app->sock); | |
3757b385 | 2717 | ret = 0; |
be355079 JR |
2718 | } else { |
2719 | ERR("UST app creating session failed with ret %d: pid = %d, sock =%d", | |
2720 | ret, app->pid, app->sock); | |
ffe60014 | 2721 | } |
d0b96690 | 2722 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2723 | if (ret != -ENOMEM) { |
2724 | /* | |
2725 | * Tracer is probably gone or got an internal error so let's | |
2726 | * behave like it will soon unregister or not usable. | |
2727 | */ | |
2728 | ret = -ENOTCONN; | |
2729 | } | |
2730 | goto error; | |
421cb601 DG |
2731 | } |
2732 | ||
7972aab2 DG |
2733 | ua_sess->handle = ret; |
2734 | ||
2735 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2736 | lttng_ht_node_init_u64(&ua_sess->node, |
2737 | ua_sess->tracing_id); | |
2738 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2739 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2740 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2741 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2742 | |
2743 | DBG2("UST app session created successfully with handle %d", ret); | |
2744 | } | |
2745 | ||
2746 | *ua_sess_ptr = ua_sess; | |
2747 | if (is_created) { | |
2748 | *is_created = created; | |
2749 | } | |
2750 | ||
2751 | /* Everything went well. */ | |
2752 | ret = 0; | |
2753 | ||
2754 | error: | |
2755 | health_code_update(); | |
2756 | return ret; | |
2757 | } | |
2758 | ||
6a6b2068 JG |
2759 | /* |
2760 | * Match function for a hash table lookup of ust_app_ctx. | |
2761 | * | |
2762 | * It matches an ust app context based on the context type and, in the case | |
2763 | * of perf counters, their name. | |
2764 | */ | |
2765 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2766 | { | |
2767 | struct ust_app_ctx *ctx; | |
bdf64013 | 2768 | const struct lttng_ust_context_attr *key; |
6a6b2068 | 2769 | |
a0377dfe FD |
2770 | LTTNG_ASSERT(node); |
2771 | LTTNG_ASSERT(_key); | |
6a6b2068 JG |
2772 | |
2773 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
7966af57 | 2774 | key = (lttng_ust_context_attr *) _key; |
6a6b2068 JG |
2775 | |
2776 | /* Context type */ | |
2777 | if (ctx->ctx.ctx != key->ctx) { | |
2778 | goto no_match; | |
2779 | } | |
2780 | ||
bdf64013 | 2781 | switch(key->ctx) { |
fc4b93fa | 2782 | case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER: |
6a6b2068 | 2783 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2784 | ctx->ctx.u.perf_counter.name, |
2785 | sizeof(key->u.perf_counter.name))) { | |
2786 | goto no_match; | |
2787 | } | |
2788 | break; | |
fc4b93fa | 2789 | case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT: |
bdf64013 JG |
2790 | if (strcmp(key->u.app_ctx.provider_name, |
2791 | ctx->ctx.u.app_ctx.provider_name) || | |
2792 | strcmp(key->u.app_ctx.ctx_name, | |
2793 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2794 | goto no_match; |
2795 | } | |
bdf64013 JG |
2796 | break; |
2797 | default: | |
2798 | break; | |
6a6b2068 JG |
2799 | } |
2800 | ||
2801 | /* Match. */ | |
2802 | return 1; | |
2803 | ||
2804 | no_match: | |
2805 | return 0; | |
2806 | } | |
2807 | ||
2808 | /* | |
2809 | * Lookup for an ust app context from an lttng_ust_context. | |
2810 | * | |
be184a0f | 2811 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2812 | * Return an ust_app_ctx object or NULL on error. |
2813 | */ | |
2814 | static | |
2815 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2816 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2817 | { |
2818 | struct lttng_ht_iter iter; | |
2819 | struct lttng_ht_node_ulong *node; | |
2820 | struct ust_app_ctx *app_ctx = NULL; | |
2821 | ||
a0377dfe FD |
2822 | LTTNG_ASSERT(uctx); |
2823 | LTTNG_ASSERT(ht); | |
6a6b2068 JG |
2824 | |
2825 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2826 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2827 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2828 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2829 | if (!node) { | |
2830 | goto end; | |
2831 | } | |
2832 | ||
2833 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2834 | ||
2835 | end: | |
2836 | return app_ctx; | |
2837 | } | |
2838 | ||
7972aab2 DG |
2839 | /* |
2840 | * Create a context for the channel on the tracer. | |
2841 | * | |
2842 | * Called with UST app session lock held and a RCU read side lock. | |
2843 | */ | |
2844 | static | |
c9edf082 | 2845 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
f3db82be | 2846 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2847 | struct ust_app *app) |
2848 | { | |
2849 | int ret = 0; | |
7972aab2 DG |
2850 | struct ust_app_ctx *ua_ctx; |
2851 | ||
2852 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2853 | ||
6a6b2068 JG |
2854 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2855 | if (ua_ctx) { | |
7972aab2 DG |
2856 | ret = -EEXIST; |
2857 | goto error; | |
2858 | } | |
2859 | ||
2860 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2861 | if (ua_ctx == NULL) { | |
2862 | /* malloc failed */ | |
7682f304 | 2863 | ret = -ENOMEM; |
7972aab2 DG |
2864 | goto error; |
2865 | } | |
2866 | ||
2867 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2868 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2869 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2870 | |
2871 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2872 | if (ret < 0) { | |
2873 | goto error; | |
2874 | } | |
2875 | ||
2876 | error: | |
2877 | return ret; | |
2878 | } | |
2879 | ||
2880 | /* | |
2881 | * Enable on the tracer side a ust app event for the session and channel. | |
2882 | * | |
2883 | * Called with UST app session lock held. | |
2884 | */ | |
2885 | static | |
2886 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2887 | struct ust_app_event *ua_event, struct ust_app *app) | |
2888 | { | |
2889 | int ret; | |
2890 | ||
3428a1b7 | 2891 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2892 | if (ret < 0) { |
2893 | goto error; | |
2894 | } | |
2895 | ||
2896 | ua_event->enabled = 1; | |
2897 | ||
2898 | error: | |
2899 | return ret; | |
2900 | } | |
2901 | ||
2902 | /* | |
2903 | * Disable on the tracer side a ust app event for the session and channel. | |
2904 | */ | |
2905 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2906 | struct ust_app_event *ua_event, struct ust_app *app) | |
2907 | { | |
2908 | int ret; | |
2909 | ||
e2456d0a | 2910 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2911 | if (ret < 0) { |
2912 | goto error; | |
2913 | } | |
2914 | ||
2915 | ua_event->enabled = 0; | |
2916 | ||
2917 | error: | |
2918 | return ret; | |
2919 | } | |
2920 | ||
2921 | /* | |
2922 | * Lookup ust app channel for session and disable it on the tracer side. | |
2923 | */ | |
2924 | static | |
2925 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2926 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2927 | { | |
2928 | int ret; | |
2929 | ||
2930 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2931 | if (ret < 0) { | |
2932 | goto error; | |
2933 | } | |
2934 | ||
2935 | ua_chan->enabled = 0; | |
2936 | ||
2937 | error: | |
2938 | return ret; | |
2939 | } | |
2940 | ||
2941 | /* | |
2942 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2943 | * MUST be called with a RCU read side lock acquired. | |
2944 | */ | |
2945 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2946 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2947 | { | |
2948 | int ret = 0; | |
2949 | struct lttng_ht_iter iter; | |
2950 | struct lttng_ht_node_str *ua_chan_node; | |
2951 | struct ust_app_channel *ua_chan; | |
2952 | ||
2953 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2954 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2955 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2956 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2957 | uchan->name, ua_sess->tracing_id); |
2958 | goto error; | |
2959 | } | |
2960 | ||
2961 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2962 | ||
2963 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2964 | if (ret < 0) { | |
2965 | goto error; | |
2966 | } | |
2967 | ||
2968 | error: | |
2969 | return ret; | |
2970 | } | |
2971 | ||
2972 | /* | |
2973 | * Ask the consumer to create a channel and get it if successful. | |
2974 | * | |
fad1ed2f JR |
2975 | * Called with UST app session lock held. |
2976 | * | |
7972aab2 DG |
2977 | * Return 0 on success or else a negative value. |
2978 | */ | |
2979 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2980 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2981 | int bitness, struct ust_registry_session *registry, |
2982 | uint64_t trace_archive_id) | |
7972aab2 DG |
2983 | { |
2984 | int ret; | |
2985 | unsigned int nb_fd = 0; | |
2986 | struct consumer_socket *socket; | |
2987 | ||
a0377dfe FD |
2988 | LTTNG_ASSERT(usess); |
2989 | LTTNG_ASSERT(ua_sess); | |
2990 | LTTNG_ASSERT(ua_chan); | |
2991 | LTTNG_ASSERT(registry); | |
7972aab2 DG |
2992 | |
2993 | rcu_read_lock(); | |
2994 | health_code_update(); | |
2995 | ||
2996 | /* Get the right consumer socket for the application. */ | |
2997 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2998 | if (!socket) { | |
2999 | ret = -EINVAL; | |
3000 | goto error; | |
3001 | } | |
3002 | ||
3003 | health_code_update(); | |
3004 | ||
3005 | /* Need one fd for the channel. */ | |
3006 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3007 | if (ret < 0) { | |
3008 | ERR("Exhausted number of available FD upon create channel"); | |
3009 | goto error; | |
3010 | } | |
3011 | ||
3012 | /* | |
3013 | * Ask consumer to create channel. The consumer will return the number of | |
3014 | * stream we have to expect. | |
3015 | */ | |
3016 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 3017 | registry, usess->current_trace_chunk); |
7972aab2 DG |
3018 | if (ret < 0) { |
3019 | goto error_ask; | |
3020 | } | |
3021 | ||
3022 | /* | |
3023 | * Compute the number of fd needed before receiving them. It must be 2 per | |
3024 | * stream (2 being the default value here). | |
3025 | */ | |
3026 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
3027 | ||
3028 | /* Reserve the amount of file descriptor we need. */ | |
3029 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
3030 | if (ret < 0) { | |
3031 | ERR("Exhausted number of available FD upon create channel"); | |
3032 | goto error_fd_get_stream; | |
3033 | } | |
3034 | ||
3035 | health_code_update(); | |
3036 | ||
3037 | /* | |
db786d44 | 3038 | * Now get the channel from the consumer. This call will populate the stream |
7972aab2 DG |
3039 | * list of that channel and set the ust objects. |
3040 | */ | |
d9078d0c DG |
3041 | if (usess->consumer->enabled) { |
3042 | ret = ust_consumer_get_channel(socket, ua_chan); | |
3043 | if (ret < 0) { | |
3044 | goto error_destroy; | |
3045 | } | |
7972aab2 DG |
3046 | } |
3047 | ||
3048 | rcu_read_unlock(); | |
3049 | return 0; | |
3050 | ||
3051 | error_destroy: | |
3052 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
3053 | error_fd_get_stream: | |
3054 | /* | |
3055 | * Initiate a destroy channel on the consumer since we had an error | |
3056 | * handling it on our side. The return value is of no importance since we | |
3057 | * already have a ret value set by the previous error that we need to | |
3058 | * return. | |
3059 | */ | |
3060 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
3061 | error_ask: | |
3062 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3063 | error: | |
3064 | health_code_update(); | |
3065 | rcu_read_unlock(); | |
3066 | return ret; | |
3067 | } | |
3068 | ||
3069 | /* | |
3070 | * Duplicate the ust data object of the ust app stream and save it in the | |
3071 | * buffer registry stream. | |
3072 | * | |
3073 | * Return 0 on success or else a negative value. | |
3074 | */ | |
3075 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
3076 | struct ust_app_stream *stream) | |
3077 | { | |
3078 | int ret; | |
3079 | ||
a0377dfe FD |
3080 | LTTNG_ASSERT(reg_stream); |
3081 | LTTNG_ASSERT(stream); | |
7972aab2 | 3082 | |
86ba1e22 | 3083 | /* Duplicating a stream requires 2 new fds. Reserve them. */ |
7972aab2 DG |
3084 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); |
3085 | if (ret < 0) { | |
3086 | ERR("Exhausted number of available FD upon duplicate stream"); | |
3087 | goto error; | |
3088 | } | |
3089 | ||
3090 | /* Duplicate object for stream once the original is in the registry. */ | |
b623cb6a | 3091 | ret = lttng_ust_ctl_duplicate_ust_object_data(&stream->obj, |
7972aab2 DG |
3092 | reg_stream->obj.ust); |
3093 | if (ret < 0) { | |
3094 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
3095 | reg_stream->obj.ust, stream->obj, ret); | |
3096 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
3097 | goto error; | |
3098 | } | |
3099 | stream->handle = stream->obj->handle; | |
3100 | ||
3101 | error: | |
3102 | return ret; | |
3103 | } | |
3104 | ||
3105 | /* | |
3106 | * Duplicate the ust data object of the ust app. channel and save it in the | |
3107 | * buffer registry channel. | |
3108 | * | |
3109 | * Return 0 on success or else a negative value. | |
3110 | */ | |
3273699d | 3111 | static int duplicate_channel_object(struct buffer_reg_channel *buf_reg_chan, |
7972aab2 DG |
3112 | struct ust_app_channel *ua_chan) |
3113 | { | |
3114 | int ret; | |
3115 | ||
a0377dfe FD |
3116 | LTTNG_ASSERT(buf_reg_chan); |
3117 | LTTNG_ASSERT(ua_chan); | |
7972aab2 | 3118 | |
86ba1e22 | 3119 | /* Duplicating a channel requires 1 new fd. Reserve it. */ |
7972aab2 DG |
3120 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
3121 | if (ret < 0) { | |
3122 | ERR("Exhausted number of available FD upon duplicate channel"); | |
3123 | goto error_fd_get; | |
3124 | } | |
3125 | ||
3126 | /* Duplicate object for stream once the original is in the registry. */ | |
b623cb6a | 3127 | ret = lttng_ust_ctl_duplicate_ust_object_data(&ua_chan->obj, buf_reg_chan->obj.ust); |
7972aab2 DG |
3128 | if (ret < 0) { |
3129 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
3273699d | 3130 | buf_reg_chan->obj.ust, ua_chan->obj, ret); |
7972aab2 DG |
3131 | goto error; |
3132 | } | |
3133 | ua_chan->handle = ua_chan->obj->handle; | |
3134 | ||
3135 | return 0; | |
3136 | ||
3137 | error: | |
3138 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3139 | error_fd_get: | |
3140 | return ret; | |
3141 | } | |
3142 | ||
3143 | /* | |
3144 | * For a given channel buffer registry, setup all streams of the given ust | |
3145 | * application channel. | |
3146 | * | |
3147 | * Return 0 on success or else a negative value. | |
3148 | */ | |
3273699d | 3149 | static int setup_buffer_reg_streams(struct buffer_reg_channel *buf_reg_chan, |
fb45065e MD |
3150 | struct ust_app_channel *ua_chan, |
3151 | struct ust_app *app) | |
7972aab2 DG |
3152 | { |
3153 | int ret = 0; | |
3154 | struct ust_app_stream *stream, *stmp; | |
3155 | ||
a0377dfe FD |
3156 | LTTNG_ASSERT(buf_reg_chan); |
3157 | LTTNG_ASSERT(ua_chan); | |
7972aab2 DG |
3158 | |
3159 | DBG2("UST app setup buffer registry stream"); | |
3160 | ||
3161 | /* Send all streams to application. */ | |
3162 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
3163 | struct buffer_reg_stream *reg_stream; | |
3164 | ||
3165 | ret = buffer_reg_stream_create(®_stream); | |
3166 | if (ret < 0) { | |
3167 | goto error; | |
3168 | } | |
3169 | ||
3170 | /* | |
3171 | * Keep original pointer and nullify it in the stream so the delete | |
3172 | * stream call does not release the object. | |
3173 | */ | |
3174 | reg_stream->obj.ust = stream->obj; | |
3175 | stream->obj = NULL; | |
3273699d | 3176 | buffer_reg_stream_add(reg_stream, buf_reg_chan); |
421cb601 | 3177 | |
7972aab2 DG |
3178 | /* We don't need the streams anymore. */ |
3179 | cds_list_del(&stream->list); | |
fb45065e | 3180 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 3181 | } |
421cb601 | 3182 | |
7972aab2 DG |
3183 | error: |
3184 | return ret; | |
3185 | } | |
3186 | ||
3187 | /* | |
3188 | * Create a buffer registry channel for the given session registry and | |
3189 | * application channel object. If regp pointer is valid, it's set with the | |
3190 | * created object. Important, the created object is NOT added to the session | |
3191 | * registry hash table. | |
3192 | * | |
3193 | * Return 0 on success else a negative value. | |
3194 | */ | |
3195 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
3196 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
3197 | { | |
3198 | int ret; | |
3273699d | 3199 | struct buffer_reg_channel *buf_reg_chan = NULL; |
7972aab2 | 3200 | |
a0377dfe FD |
3201 | LTTNG_ASSERT(reg_sess); |
3202 | LTTNG_ASSERT(ua_chan); | |
7972aab2 DG |
3203 | |
3204 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
3205 | ||
3206 | /* Create buffer registry channel. */ | |
3273699d | 3207 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &buf_reg_chan); |
7972aab2 DG |
3208 | if (ret < 0) { |
3209 | goto error_create; | |
421cb601 | 3210 | } |
a0377dfe | 3211 | LTTNG_ASSERT(buf_reg_chan); |
3273699d FD |
3212 | buf_reg_chan->consumer_key = ua_chan->key; |
3213 | buf_reg_chan->subbuf_size = ua_chan->attr.subbuf_size; | |
3214 | buf_reg_chan->num_subbuf = ua_chan->attr.num_subbuf; | |
421cb601 | 3215 | |
7972aab2 DG |
3216 | /* Create and add a channel registry to session. */ |
3217 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
3218 | ua_chan->tracing_channel_id); | |
3219 | if (ret < 0) { | |
3220 | goto error; | |
d88aee68 | 3221 | } |
3273699d | 3222 | buffer_reg_channel_add(reg_sess, buf_reg_chan); |
d88aee68 | 3223 | |
7972aab2 | 3224 | if (regp) { |
3273699d | 3225 | *regp = buf_reg_chan; |
3d8ca23b | 3226 | } |
d88aee68 | 3227 | |
7972aab2 | 3228 | return 0; |
3d8ca23b DG |
3229 | |
3230 | error: | |
7972aab2 | 3231 | /* Safe because the registry channel object was not added to any HT. */ |
3273699d | 3232 | buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); |
7972aab2 | 3233 | error_create: |
3d8ca23b | 3234 | return ret; |
421cb601 DG |
3235 | } |
3236 | ||
55cc08a6 | 3237 | /* |
7972aab2 DG |
3238 | * Setup buffer registry channel for the given session registry and application |
3239 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 3240 | * |
7972aab2 | 3241 | * Return 0 on success else a negative value. |
55cc08a6 | 3242 | */ |
7972aab2 | 3243 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
3273699d | 3244 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *buf_reg_chan, |
fb45065e | 3245 | struct ust_app *app) |
55cc08a6 | 3246 | { |
7972aab2 | 3247 | int ret; |
55cc08a6 | 3248 | |
a0377dfe FD |
3249 | LTTNG_ASSERT(reg_sess); |
3250 | LTTNG_ASSERT(buf_reg_chan); | |
3251 | LTTNG_ASSERT(ua_chan); | |
3252 | LTTNG_ASSERT(ua_chan->obj); | |
55cc08a6 | 3253 | |
7972aab2 | 3254 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 3255 | |
7972aab2 | 3256 | /* Setup all streams for the registry. */ |
3273699d | 3257 | ret = setup_buffer_reg_streams(buf_reg_chan, ua_chan, app); |
7972aab2 | 3258 | if (ret < 0) { |
55cc08a6 DG |
3259 | goto error; |
3260 | } | |
3261 | ||
3273699d | 3262 | buf_reg_chan->obj.ust = ua_chan->obj; |
7972aab2 | 3263 | ua_chan->obj = NULL; |
55cc08a6 | 3264 | |
7972aab2 | 3265 | return 0; |
55cc08a6 DG |
3266 | |
3267 | error: | |
3273699d FD |
3268 | buffer_reg_channel_remove(reg_sess, buf_reg_chan); |
3269 | buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
3270 | return ret; |
3271 | } | |
3272 | ||
edb67388 | 3273 | /* |
7972aab2 | 3274 | * Send buffer registry channel to the application. |
d0b96690 | 3275 | * |
7972aab2 | 3276 | * Return 0 on success else a negative value. |
edb67388 | 3277 | */ |
3273699d | 3278 | static int send_channel_uid_to_ust(struct buffer_reg_channel *buf_reg_chan, |
7972aab2 DG |
3279 | struct ust_app *app, struct ust_app_session *ua_sess, |
3280 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
3281 | { |
3282 | int ret; | |
7972aab2 | 3283 | struct buffer_reg_stream *reg_stream; |
edb67388 | 3284 | |
a0377dfe FD |
3285 | LTTNG_ASSERT(buf_reg_chan); |
3286 | LTTNG_ASSERT(app); | |
3287 | LTTNG_ASSERT(ua_sess); | |
3288 | LTTNG_ASSERT(ua_chan); | |
7972aab2 DG |
3289 | |
3290 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
3291 | ||
3273699d | 3292 | ret = duplicate_channel_object(buf_reg_chan, ua_chan); |
edb67388 DG |
3293 | if (ret < 0) { |
3294 | goto error; | |
3295 | } | |
3296 | ||
7972aab2 DG |
3297 | /* Send channel to the application. */ |
3298 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
3299 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3300 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
3301 | goto error; | |
be355079 JR |
3302 | } else if (ret == -EAGAIN) { |
3303 | /* Caused by timeout. */ | |
3304 | WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".", | |
3305 | app->pid, ua_chan->name, ua_sess->tracing_id); | |
3306 | /* Treat this the same way as an application that is exiting. */ | |
3307 | ret = -ENOTCONN; | |
3308 | goto error; | |
a7169585 | 3309 | } else if (ret < 0) { |
7972aab2 DG |
3310 | goto error; |
3311 | } | |
3312 | ||
3313 | health_code_update(); | |
3314 | ||
3315 | /* Send all streams to application. */ | |
3273699d FD |
3316 | pthread_mutex_lock(&buf_reg_chan->stream_list_lock); |
3317 | cds_list_for_each_entry(reg_stream, &buf_reg_chan->streams, lnode) { | |
7972aab2 DG |
3318 | struct ust_app_stream stream; |
3319 | ||
3320 | ret = duplicate_stream_object(reg_stream, &stream); | |
3321 | if (ret < 0) { | |
3322 | goto error_stream_unlock; | |
3323 | } | |
3324 | ||
3325 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
3326 | if (ret < 0) { | |
a7169585 MD |
3327 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3328 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
be355079 JR |
3329 | } else if (ret == -EAGAIN) { |
3330 | /* | |
3331 | * Caused by timeout. | |
3332 | * Treat this the same way as an application | |
3333 | * that is exiting. | |
3334 | */ | |
3335 | WARN("Communication with application %d timed out on send_stream for stream \"%s\" of channel \"%s\" of session \"%" PRIu64 "\".", | |
3336 | app->pid, stream.name, | |
3337 | ua_chan->name, | |
3338 | ua_sess->tracing_id); | |
3339 | ret = -ENOTCONN; | |
a7169585 | 3340 | } |
be355079 | 3341 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3342 | goto error_stream_unlock; |
3343 | } | |
edb67388 | 3344 | |
7972aab2 DG |
3345 | /* |
3346 | * The return value is not important here. This function will output an | |
3347 | * error if needed. | |
3348 | */ | |
fb45065e | 3349 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3350 | } |
3351 | ua_chan->is_sent = 1; | |
3352 | ||
3353 | error_stream_unlock: | |
3273699d | 3354 | pthread_mutex_unlock(&buf_reg_chan->stream_list_lock); |
edb67388 DG |
3355 | error: |
3356 | return ret; | |
3357 | } | |
3358 | ||
9730260e | 3359 | /* |
7972aab2 DG |
3360 | * Create and send to the application the created buffers with per UID buffers. |
3361 | * | |
9acdc1d6 | 3362 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3363 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3364 | * |
7972aab2 | 3365 | * Return 0 on success else a negative value. |
9730260e | 3366 | */ |
7972aab2 DG |
3367 | static int create_channel_per_uid(struct ust_app *app, |
3368 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3369 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3370 | { |
3371 | int ret; | |
7972aab2 | 3372 | struct buffer_reg_uid *reg_uid; |
3273699d | 3373 | struct buffer_reg_channel *buf_reg_chan; |
e32d7f27 | 3374 | struct ltt_session *session = NULL; |
e098433c | 3375 | enum lttng_error_code notification_ret; |
3273699d | 3376 | struct ust_registry_channel *ust_reg_chan; |
9730260e | 3377 | |
a0377dfe FD |
3378 | LTTNG_ASSERT(app); |
3379 | LTTNG_ASSERT(usess); | |
3380 | LTTNG_ASSERT(ua_sess); | |
3381 | LTTNG_ASSERT(ua_chan); | |
7972aab2 DG |
3382 | |
3383 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3384 | ||
3385 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3386 | /* | |
3387 | * The session creation handles the creation of this global registry | |
3388 | * object. If none can be find, there is a code flow problem or a | |
3389 | * teardown race. | |
3390 | */ | |
a0377dfe | 3391 | LTTNG_ASSERT(reg_uid); |
7972aab2 | 3392 | |
3273699d | 3393 | buf_reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, |
7972aab2 | 3394 | reg_uid); |
3273699d | 3395 | if (buf_reg_chan) { |
2721f7ea JG |
3396 | goto send_channel; |
3397 | } | |
7972aab2 | 3398 | |
2721f7ea | 3399 | /* Create the buffer registry channel object. */ |
3273699d | 3400 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &buf_reg_chan); |
2721f7ea JG |
3401 | if (ret < 0) { |
3402 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3403 | ua_chan->name); |
2721f7ea JG |
3404 | goto error; |
3405 | } | |
f14256d6 | 3406 | |
e098433c | 3407 | session = session_find_by_id(ua_sess->tracing_id); |
a0377dfe FD |
3408 | LTTNG_ASSERT(session); |
3409 | LTTNG_ASSERT(pthread_mutex_trylock(&session->lock)); | |
3410 | LTTNG_ASSERT(session_trylock_list()); | |
e098433c | 3411 | |
2721f7ea JG |
3412 | /* |
3413 | * Create the buffers on the consumer side. This call populates the | |
3414 | * ust app channel object with all streams and data object. | |
3415 | */ | |
3416 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3417 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3418 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3419 | if (ret < 0) { |
3420 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3421 | ua_chan->name); | |
7972aab2 DG |
3422 | |
3423 | /* | |
2721f7ea JG |
3424 | * Let's remove the previously created buffer registry channel so |
3425 | * it's not visible anymore in the session registry. | |
7972aab2 | 3426 | */ |
2721f7ea JG |
3427 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3428 | ua_chan->tracing_channel_id, false); | |
3273699d FD |
3429 | buffer_reg_channel_remove(reg_uid->registry, buf_reg_chan); |
3430 | buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); | |
2721f7ea | 3431 | goto error; |
7972aab2 DG |
3432 | } |
3433 | ||
2721f7ea JG |
3434 | /* |
3435 | * Setup the streams and add it to the session registry. | |
3436 | */ | |
3437 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3273699d | 3438 | ua_chan, buf_reg_chan, app); |
2721f7ea JG |
3439 | if (ret < 0) { |
3440 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3441 | goto error; | |
3442 | } | |
3443 | ||
e098433c JG |
3444 | /* Notify the notification subsystem of the channel's creation. */ |
3445 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3273699d | 3446 | ust_reg_chan = ust_registry_channel_find(reg_uid->registry->reg.ust, |
e098433c | 3447 | ua_chan->tracing_channel_id); |
a0377dfe | 3448 | LTTNG_ASSERT(ust_reg_chan); |
3273699d FD |
3449 | ust_reg_chan->consumer_key = ua_chan->key; |
3450 | ust_reg_chan = NULL; | |
e098433c | 3451 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); |
e9404c27 | 3452 | |
e098433c | 3453 | notification_ret = notification_thread_command_add_channel( |
412d7227 SM |
3454 | the_notification_thread_handle, session->name, |
3455 | lttng_credentials_get_uid( | |
3456 | &ua_sess->effective_credentials), | |
3457 | lttng_credentials_get_gid( | |
3458 | &ua_sess->effective_credentials), | |
3459 | ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST, | |
e098433c JG |
3460 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3461 | if (notification_ret != LTTNG_OK) { | |
3462 | ret = - (int) notification_ret; | |
3463 | ERR("Failed to add channel to notification thread"); | |
3464 | goto error; | |
e9404c27 JG |
3465 | } |
3466 | ||
2721f7ea | 3467 | send_channel: |
66ff8e3f | 3468 | /* Send buffers to the application. */ |
3273699d | 3469 | ret = send_channel_uid_to_ust(buf_reg_chan, app, ua_sess, ua_chan); |
66ff8e3f JG |
3470 | if (ret < 0) { |
3471 | if (ret != -ENOTCONN) { | |
3472 | ERR("Error sending channel to application"); | |
3473 | } | |
3474 | goto error; | |
3475 | } | |
3476 | ||
9730260e | 3477 | error: |
e32d7f27 JG |
3478 | if (session) { |
3479 | session_put(session); | |
3480 | } | |
9730260e DG |
3481 | return ret; |
3482 | } | |
3483 | ||
78f0bacd | 3484 | /* |
7972aab2 DG |
3485 | * Create and send to the application the created buffers with per PID buffers. |
3486 | * | |
fad1ed2f | 3487 | * Called with UST app session lock held. |
71e0a100 | 3488 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3489 | * |
7972aab2 | 3490 | * Return 0 on success else a negative value. |
78f0bacd | 3491 | */ |
7972aab2 DG |
3492 | static int create_channel_per_pid(struct ust_app *app, |
3493 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3494 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3495 | { |
8535a6d9 | 3496 | int ret; |
7972aab2 | 3497 | struct ust_registry_session *registry; |
e9404c27 | 3498 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3499 | struct ltt_session *session = NULL; |
e9404c27 | 3500 | uint64_t chan_reg_key; |
3273699d | 3501 | struct ust_registry_channel *ust_reg_chan; |
78f0bacd | 3502 | |
a0377dfe FD |
3503 | LTTNG_ASSERT(app); |
3504 | LTTNG_ASSERT(usess); | |
3505 | LTTNG_ASSERT(ua_sess); | |
3506 | LTTNG_ASSERT(ua_chan); | |
7972aab2 DG |
3507 | |
3508 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3509 | ||
3510 | rcu_read_lock(); | |
3511 | ||
3512 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3513 | /* The UST app session lock is held, registry shall not be null. */ |
a0377dfe | 3514 | LTTNG_ASSERT(registry); |
7972aab2 DG |
3515 | |
3516 | /* Create and add a new channel registry to session. */ | |
3517 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3518 | if (ret < 0) { |
f14256d6 MD |
3519 | ERR("Error creating the UST channel \"%s\" registry instance", |
3520 | ua_chan->name); | |
78f0bacd DG |
3521 | goto error; |
3522 | } | |
3523 | ||
e098433c | 3524 | session = session_find_by_id(ua_sess->tracing_id); |
a0377dfe | 3525 | LTTNG_ASSERT(session); |
e098433c | 3526 | |
a0377dfe FD |
3527 | LTTNG_ASSERT(pthread_mutex_trylock(&session->lock)); |
3528 | LTTNG_ASSERT(session_trylock_list()); | |
e098433c | 3529 | |
7972aab2 DG |
3530 | /* Create and get channel on the consumer side. */ |
3531 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3532 | app->bits_per_long, registry, |
d2956687 | 3533 | session->most_recent_chunk_id.value); |
7972aab2 | 3534 | if (ret < 0) { |
f14256d6 MD |
3535 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3536 | ua_chan->name); | |
5b951542 | 3537 | goto error_remove_from_registry; |
7972aab2 DG |
3538 | } |
3539 | ||
3540 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3541 | if (ret < 0) { | |
a7169585 MD |
3542 | if (ret != -ENOTCONN) { |
3543 | ERR("Error sending channel to application"); | |
3544 | } | |
5b951542 | 3545 | goto error_remove_from_registry; |
7972aab2 | 3546 | } |
8535a6d9 | 3547 | |
e9404c27 JG |
3548 | chan_reg_key = ua_chan->key; |
3549 | pthread_mutex_lock(®istry->lock); | |
3273699d | 3550 | ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key); |
a0377dfe | 3551 | LTTNG_ASSERT(ust_reg_chan); |
3273699d | 3552 | ust_reg_chan->consumer_key = ua_chan->key; |
e9404c27 JG |
3553 | pthread_mutex_unlock(®istry->lock); |
3554 | ||
3555 | cmd_ret = notification_thread_command_add_channel( | |
412d7227 SM |
3556 | the_notification_thread_handle, session->name, |
3557 | lttng_credentials_get_uid( | |
3558 | &ua_sess->effective_credentials), | |
3559 | lttng_credentials_get_gid( | |
3560 | &ua_sess->effective_credentials), | |
3561 | ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST, | |
e9404c27 JG |
3562 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3563 | if (cmd_ret != LTTNG_OK) { | |
3564 | ret = - (int) cmd_ret; | |
3565 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3566 | goto error_remove_from_registry; |
e9404c27 JG |
3567 | } |
3568 | ||
5b951542 MD |
3569 | error_remove_from_registry: |
3570 | if (ret) { | |
3571 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3572 | } | |
78f0bacd | 3573 | error: |
7972aab2 | 3574 | rcu_read_unlock(); |
e32d7f27 JG |
3575 | if (session) { |
3576 | session_put(session); | |
3577 | } | |
78f0bacd DG |
3578 | return ret; |
3579 | } | |
3580 | ||
3581 | /* | |
7972aab2 | 3582 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3583 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3584 | * side lock acquired. |
3585 | * | |
fad1ed2f JR |
3586 | * Called with UST app session lock held. |
3587 | * | |
a7169585 MD |
3588 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3589 | * the application exited concurrently. | |
78f0bacd | 3590 | */ |
88e3c2f5 | 3591 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3592 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3593 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3594 | { |
7972aab2 | 3595 | int ret; |
78f0bacd | 3596 | |
a0377dfe FD |
3597 | LTTNG_ASSERT(app); |
3598 | LTTNG_ASSERT(usess); | |
3599 | LTTNG_ASSERT(usess->active); | |
3600 | LTTNG_ASSERT(ua_sess); | |
3601 | LTTNG_ASSERT(ua_chan); | |
7972aab2 DG |
3602 | |
3603 | /* Handle buffer type before sending the channel to the application. */ | |
3604 | switch (usess->buffer_type) { | |
3605 | case LTTNG_BUFFER_PER_UID: | |
3606 | { | |
3607 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3608 | if (ret < 0) { | |
3609 | goto error; | |
3610 | } | |
3611 | break; | |
3612 | } | |
3613 | case LTTNG_BUFFER_PER_PID: | |
3614 | { | |
3615 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3616 | if (ret < 0) { | |
3617 | goto error; | |
3618 | } | |
3619 | break; | |
3620 | } | |
3621 | default: | |
a0377dfe | 3622 | abort(); |
7972aab2 | 3623 | ret = -EINVAL; |
78f0bacd DG |
3624 | goto error; |
3625 | } | |
3626 | ||
7972aab2 DG |
3627 | /* Initialize ust objd object using the received handle and add it. */ |
3628 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3629 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3630 | |
7972aab2 DG |
3631 | /* If channel is not enabled, disable it on the tracer */ |
3632 | if (!ua_chan->enabled) { | |
3633 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3634 | if (ret < 0) { | |
3635 | goto error; | |
3636 | } | |
78f0bacd DG |
3637 | } |
3638 | ||
3639 | error: | |
3640 | return ret; | |
3641 | } | |
3642 | ||
284d8f55 | 3643 | /* |
88e3c2f5 | 3644 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3645 | * |
36b588ed | 3646 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3647 | * |
88e3c2f5 | 3648 | * Return 0 on success or else a negative value. |
284d8f55 | 3649 | */ |
88e3c2f5 JG |
3650 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3651 | struct ltt_ust_channel *uchan, | |
fc4b93fa | 3652 | enum lttng_ust_abi_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3653 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3654 | { |
3655 | int ret = 0; | |
bec39940 DG |
3656 | struct lttng_ht_iter iter; |
3657 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3658 | struct ust_app_channel *ua_chan; |
3659 | ||
3660 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3661 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3662 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3663 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3664 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3665 | goto end; |
5b4a0ec0 DG |
3666 | } |
3667 | ||
d0b96690 | 3668 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3669 | if (ua_chan == NULL) { |
3670 | /* Only malloc can fail here */ | |
4d710ac2 | 3671 | ret = -ENOMEM; |
88e3c2f5 | 3672 | goto error; |
fc34caaa DG |
3673 | } |
3674 | shadow_copy_channel(ua_chan, uchan); | |
3675 | ||
ffe60014 DG |
3676 | /* Set channel type. */ |
3677 | ua_chan->attr.type = type; | |
3678 | ||
d0b96690 DG |
3679 | /* Only add the channel if successful on the tracer side. */ |
3680 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3681 | end: |
4d710ac2 DG |
3682 | if (ua_chanp) { |
3683 | *ua_chanp = ua_chan; | |
3684 | } | |
3685 | ||
3686 | /* Everything went well. */ | |
3687 | return 0; | |
5b4a0ec0 DG |
3688 | |
3689 | error: | |
4d710ac2 | 3690 | return ret; |
5b4a0ec0 DG |
3691 | } |
3692 | ||
3693 | /* | |
3694 | * Create UST app event and create it on the tracer side. | |
d0b96690 | 3695 | * |
993578ff | 3696 | * Must be called with the RCU read side lock held. |
d0b96690 | 3697 | * Called with ust app session mutex held. |
5b4a0ec0 | 3698 | */ |
edb67388 DG |
3699 | static |
3700 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3701 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3702 | struct ust_app *app) | |
284d8f55 | 3703 | { |
edb67388 | 3704 | int ret = 0; |
5b4a0ec0 | 3705 | struct ust_app_event *ua_event; |
284d8f55 | 3706 | |
edb67388 DG |
3707 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3708 | if (ua_event == NULL) { | |
20533947 | 3709 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3710 | ret = -ENOMEM; |
fc34caaa | 3711 | goto end; |
5b4a0ec0 | 3712 | } |
edb67388 | 3713 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3714 | |
edb67388 | 3715 | /* Create it on the tracer side */ |
5b4a0ec0 | 3716 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3717 | if (ret < 0) { |
e9f11505 JG |
3718 | /* |
3719 | * Not found previously means that it does not exist on the | |
3720 | * tracer. If the application reports that the event existed, | |
3721 | * it means there is a bug in the sessiond or lttng-ust | |
3722 | * (or corruption, etc.) | |
3723 | */ | |
3724 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3725 | ERR("Tracer for application reported that an event being created already existed: " | |
3726 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3727 | uevent->attr.name, | |
3728 | app->pid, app->ppid, app->uid, | |
3729 | app->gid); | |
3730 | } | |
284d8f55 DG |
3731 | goto error; |
3732 | } | |
3733 | ||
d0b96690 | 3734 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3735 | |
be355079 JR |
3736 | DBG2("UST app create event completed: app = '%s' pid = %d", |
3737 | app->name, app->pid); | |
7f79d3a1 | 3738 | |
edb67388 | 3739 | end: |
fc34caaa DG |
3740 | return ret; |
3741 | ||
5b4a0ec0 | 3742 | error: |
fc34caaa | 3743 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3744 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3745 | return ret; |
5b4a0ec0 DG |
3746 | } |
3747 | ||
993578ff JR |
3748 | /* |
3749 | * Create UST app event notifier rule and create it on the tracer side. | |
3750 | * | |
3751 | * Must be called with the RCU read side lock held. | |
3752 | * Called with ust app session mutex held. | |
3753 | */ | |
3754 | static | |
267d66aa JR |
3755 | int create_ust_app_event_notifier_rule(struct lttng_trigger *trigger, |
3756 | struct ust_app *app) | |
993578ff JR |
3757 | { |
3758 | int ret = 0; | |
3759 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
3760 | ||
267d66aa | 3761 | ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(trigger); |
993578ff JR |
3762 | if (ua_event_notifier_rule == NULL) { |
3763 | ret = -ENOMEM; | |
3764 | goto end; | |
3765 | } | |
3766 | ||
3767 | /* Create it on the tracer side. */ | |
3768 | ret = create_ust_event_notifier(app, ua_event_notifier_rule); | |
3769 | if (ret < 0) { | |
3770 | /* | |
3771 | * Not found previously means that it does not exist on the | |
3772 | * tracer. If the application reports that the event existed, | |
3773 | * it means there is a bug in the sessiond or lttng-ust | |
3774 | * (or corruption, etc.) | |
3775 | */ | |
3776 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3777 | ERR("Tracer for application reported that an event notifier being created already exists: " | |
3778 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
267d66aa | 3779 | lttng_trigger_get_tracer_token(trigger), |
993578ff JR |
3780 | app->pid, app->ppid, app->uid, |
3781 | app->gid); | |
3782 | } | |
3783 | goto error; | |
3784 | } | |
3785 | ||
3786 | lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht, | |
3787 | &ua_event_notifier_rule->node); | |
3788 | ||
9324443a | 3789 | DBG2("UST app create token event rule completed: app = '%s', pid = %d, token = %" PRIu64, |
be355079 | 3790 | app->name, app->pid, lttng_trigger_get_tracer_token(trigger)); |
993578ff | 3791 | |
533a90fb | 3792 | goto end; |
993578ff JR |
3793 | |
3794 | error: | |
3795 | /* The RCU read side lock is already being held by the caller. */ | |
3796 | delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app); | |
533a90fb | 3797 | end: |
993578ff JR |
3798 | return ret; |
3799 | } | |
3800 | ||
5b4a0ec0 DG |
3801 | /* |
3802 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3803 | * |
7972aab2 | 3804 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3805 | */ |
3806 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3807 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3808 | { |
3809 | int ret = 0; | |
ffe60014 | 3810 | struct ust_app_channel *metadata; |
d88aee68 | 3811 | struct consumer_socket *socket; |
7972aab2 | 3812 | struct ust_registry_session *registry; |
e32d7f27 | 3813 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3814 | |
a0377dfe FD |
3815 | LTTNG_ASSERT(ua_sess); |
3816 | LTTNG_ASSERT(app); | |
3817 | LTTNG_ASSERT(consumer); | |
5b4a0ec0 | 3818 | |
7972aab2 | 3819 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3820 | /* The UST app session is held registry shall not be null. */ |
a0377dfe | 3821 | LTTNG_ASSERT(registry); |
7972aab2 | 3822 | |
ce34fcd0 MD |
3823 | pthread_mutex_lock(®istry->lock); |
3824 | ||
1b532a60 DG |
3825 | /* Metadata already exists for this registry or it was closed previously */ |
3826 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3827 | ret = 0; |
3828 | goto error; | |
5b4a0ec0 DG |
3829 | } |
3830 | ||
ffe60014 | 3831 | /* Allocate UST metadata */ |
d0b96690 | 3832 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3833 | if (!metadata) { |
3834 | /* malloc() failed */ | |
3835 | ret = -ENOMEM; | |
3836 | goto error; | |
3837 | } | |
5b4a0ec0 | 3838 | |
ad7a9107 | 3839 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3840 | |
7972aab2 DG |
3841 | /* Need one fd for the channel. */ |
3842 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3843 | if (ret < 0) { | |
3844 | ERR("Exhausted number of available FD upon create metadata"); | |
3845 | goto error; | |
3846 | } | |
3847 | ||
4dc3dfc5 DG |
3848 | /* Get the right consumer socket for the application. */ |
3849 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3850 | if (!socket) { | |
3851 | ret = -EINVAL; | |
3852 | goto error_consumer; | |
3853 | } | |
3854 | ||
331744e3 JD |
3855 | /* |
3856 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3857 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3858 | * consumer requesting the metadata and the ask_channel call on our side | |
3859 | * did not returned yet. | |
3860 | */ | |
3861 | registry->metadata_key = metadata->key; | |
3862 | ||
e098433c | 3863 | session = session_find_by_id(ua_sess->tracing_id); |
a0377dfe | 3864 | LTTNG_ASSERT(session); |
e098433c | 3865 | |
a0377dfe FD |
3866 | LTTNG_ASSERT(pthread_mutex_trylock(&session->lock)); |
3867 | LTTNG_ASSERT(session_trylock_list()); | |
e098433c | 3868 | |
d88aee68 DG |
3869 | /* |
3870 | * Ask the metadata channel creation to the consumer. The metadata object | |
3871 | * will be created by the consumer and kept their. However, the stream is | |
3872 | * never added or monitored until we do a first push metadata to the | |
3873 | * consumer. | |
3874 | */ | |
7972aab2 | 3875 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3876 | registry, session->current_trace_chunk); |
d88aee68 | 3877 | if (ret < 0) { |
f2a444f1 DG |
3878 | /* Nullify the metadata key so we don't try to close it later on. */ |
3879 | registry->metadata_key = 0; | |
d88aee68 DG |
3880 | goto error_consumer; |
3881 | } | |
3882 | ||
3883 | /* | |
3884 | * The setup command will make the metadata stream be sent to the relayd, | |
3885 | * if applicable, and the thread managing the metadatas. This is important | |
3886 | * because after this point, if an error occurs, the only way the stream | |
3887 | * can be deleted is to be monitored in the consumer. | |
3888 | */ | |
7972aab2 | 3889 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3890 | if (ret < 0) { |
f2a444f1 DG |
3891 | /* Nullify the metadata key so we don't try to close it later on. */ |
3892 | registry->metadata_key = 0; | |
d88aee68 | 3893 | goto error_consumer; |
5b4a0ec0 DG |
3894 | } |
3895 | ||
7972aab2 DG |
3896 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3897 | metadata->key, app->pid); | |
5b4a0ec0 | 3898 | |
d88aee68 | 3899 | error_consumer: |
b80f0b6c | 3900 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3901 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3902 | error: |
ce34fcd0 | 3903 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3904 | if (session) { |
3905 | session_put(session); | |
3906 | } | |
ffe60014 | 3907 | return ret; |
5b4a0ec0 DG |
3908 | } |
3909 | ||
5b4a0ec0 | 3910 | /* |
d88aee68 DG |
3911 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3912 | * acquired before calling this function. | |
5b4a0ec0 DG |
3913 | */ |
3914 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3915 | { | |
d88aee68 | 3916 | struct ust_app *app = NULL; |
bec39940 DG |
3917 | struct lttng_ht_node_ulong *node; |
3918 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3919 | |
bec39940 DG |
3920 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3921 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3922 | if (node == NULL) { |
3923 | DBG2("UST app no found with pid %d", pid); | |
3924 | goto error; | |
3925 | } | |
5b4a0ec0 DG |
3926 | |
3927 | DBG2("Found UST app by pid %d", pid); | |
3928 | ||
d88aee68 | 3929 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3930 | |
3931 | error: | |
d88aee68 | 3932 | return app; |
5b4a0ec0 DG |
3933 | } |
3934 | ||
d88aee68 DG |
3935 | /* |
3936 | * Allocate and init an UST app object using the registration information and | |
3937 | * the command socket. This is called when the command socket connects to the | |
3938 | * session daemon. | |
3939 | * | |
3940 | * The object is returned on success or else NULL. | |
3941 | */ | |
d0b96690 | 3942 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3943 | { |
5e2abfaf | 3944 | int ret; |
d0b96690 | 3945 | struct ust_app *lta = NULL; |
da873412 | 3946 | struct lttng_pipe *event_notifier_event_source_pipe = NULL; |
d0b96690 | 3947 | |
a0377dfe FD |
3948 | LTTNG_ASSERT(msg); |
3949 | LTTNG_ASSERT(sock >= 0); | |
d0b96690 DG |
3950 | |
3951 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3952 | |
173af62f | 3953 | if ((msg->bits_per_long == 64 && |
412d7227 SM |
3954 | (uatomic_read(&the_ust_consumerd64_fd) == |
3955 | -EINVAL)) || | |
3956 | (msg->bits_per_long == 32 && | |
3957 | (uatomic_read(&the_ust_consumerd32_fd) == | |
3958 | -EINVAL))) { | |
f943b0fb | 3959 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3960 | "%d-bit long, but no consumerd for this size is available.\n", |
3961 | msg->name, msg->pid, msg->bits_per_long); | |
3962 | goto error; | |
3f2c5fcc | 3963 | } |
d0b96690 | 3964 | |
5e2abfaf JG |
3965 | /* |
3966 | * Reserve the two file descriptors of the event source pipe. The write | |
3967 | * end will be closed once it is passed to the application, at which | |
3968 | * point a single 'put' will be performed. | |
3969 | */ | |
3970 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
3971 | if (ret) { | |
be355079 JR |
3972 | ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s', pid = %d", |
3973 | msg->name, (int) msg->pid); | |
5e2abfaf JG |
3974 | goto error; |
3975 | } | |
3976 | ||
da873412 JR |
3977 | event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3978 | if (!event_notifier_event_source_pipe) { | |
be355079 JR |
3979 | PERROR("Failed to open application event source pipe: '%s' (pid = %d)", |
3980 | msg->name, msg->pid); | |
da873412 JR |
3981 | goto error; |
3982 | } | |
3983 | ||
7966af57 | 3984 | lta = (ust_app *) zmalloc(sizeof(struct ust_app)); |
5b4a0ec0 DG |
3985 | if (lta == NULL) { |
3986 | PERROR("malloc"); | |
da873412 | 3987 | goto error_free_pipe; |
5b4a0ec0 DG |
3988 | } |
3989 | ||
da873412 JR |
3990 | lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe; |
3991 | ||
5b4a0ec0 DG |
3992 | lta->ppid = msg->ppid; |
3993 | lta->uid = msg->uid; | |
3994 | lta->gid = msg->gid; | |
d0b96690 | 3995 | |
7753dea8 | 3996 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3997 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3998 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3999 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
4000 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
4001 | lta->long_alignment = msg->long_alignment; | |
4002 | lta->byte_order = msg->byte_order; | |
4003 | ||
5b4a0ec0 DG |
4004 | lta->v_major = msg->major; |
4005 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 4006 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 4007 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 4008 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 4009 | lta->notify_sock = -1; |
993578ff | 4010 | lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
4011 | |
4012 | /* Copy name and make sure it's NULL terminated. */ | |
4013 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
4014 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
4015 | ||
4016 | /* | |
4017 | * Before this can be called, when receiving the registration information, | |
4018 | * the application compatibility is checked. So, at this point, the | |
4019 | * application can work with this session daemon. | |
4020 | */ | |
d0b96690 | 4021 | lta->compatible = 1; |
5b4a0ec0 | 4022 | |
852d0037 | 4023 | lta->pid = msg->pid; |
d0b96690 | 4024 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 4025 | lta->sock = sock; |
fb45065e | 4026 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 4027 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 4028 | |
d42f20df | 4029 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 | 4030 | return lta; |
da873412 JR |
4031 | |
4032 | error_free_pipe: | |
4033 | lttng_pipe_destroy(event_notifier_event_source_pipe); | |
5e2abfaf | 4034 | lttng_fd_put(LTTNG_FD_APPS, 2); |
da873412 JR |
4035 | error: |
4036 | return NULL; | |
d0b96690 DG |
4037 | } |
4038 | ||
d88aee68 DG |
4039 | /* |
4040 | * For a given application object, add it to every hash table. | |
4041 | */ | |
d0b96690 DG |
4042 | void ust_app_add(struct ust_app *app) |
4043 | { | |
a0377dfe FD |
4044 | LTTNG_ASSERT(app); |
4045 | LTTNG_ASSERT(app->notify_sock >= 0); | |
d0b96690 | 4046 | |
940c4592 JR |
4047 | app->registration_time = time(NULL); |
4048 | ||
5b4a0ec0 | 4049 | rcu_read_lock(); |
852d0037 DG |
4050 | |
4051 | /* | |
4052 | * On a re-registration, we want to kick out the previous registration of | |
4053 | * that pid | |
4054 | */ | |
d0b96690 | 4055 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
4056 | |
4057 | /* | |
4058 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
4059 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
4060 | * already in the table. | |
4061 | */ | |
d0b96690 | 4062 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 4063 | |
d0b96690 DG |
4064 | /* Add application to the notify socket hash table. */ |
4065 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
4066 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 4067 | |
be355079 JR |
4068 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock =%d name:%s " |
4069 | "notify_sock =%d (version %d.%d)", app->pid, app->ppid, app->uid, | |
d88aee68 DG |
4070 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, |
4071 | app->v_minor); | |
5b4a0ec0 | 4072 | |
d0b96690 DG |
4073 | rcu_read_unlock(); |
4074 | } | |
4075 | ||
d88aee68 DG |
4076 | /* |
4077 | * Set the application version into the object. | |
4078 | * | |
4079 | * Return 0 on success else a negative value either an errno code or a | |
4080 | * LTTng-UST error code. | |
4081 | */ | |
d0b96690 DG |
4082 | int ust_app_version(struct ust_app *app) |
4083 | { | |
d88aee68 DG |
4084 | int ret; |
4085 | ||
a0377dfe | 4086 | LTTNG_ASSERT(app); |
d88aee68 | 4087 | |
fb45065e | 4088 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 4089 | ret = lttng_ust_ctl_tracer_version(app->sock, &app->version); |
fb45065e | 4090 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 | 4091 | if (ret < 0) { |
be355079 JR |
4092 | if (ret == -LTTNG_UST_ERR_EXITING || ret == -EPIPE) { |
4093 | DBG3("UST app version failed. Application is dead: pid = %d, sock = %d", | |
4094 | app->pid, app->sock); | |
4095 | } else if (ret == -EAGAIN) { | |
4096 | WARN("UST app version failed. Communication time out: pid = %d, sock = %d", | |
4097 | app->pid, app->sock); | |
d88aee68 | 4098 | } else { |
be355079 JR |
4099 | ERR("UST app version failed with ret %d: pid = %d, sock = %d", |
4100 | ret, app->pid, app->sock); | |
d88aee68 DG |
4101 | } |
4102 | } | |
4103 | ||
4104 | return ret; | |
5b4a0ec0 DG |
4105 | } |
4106 | ||
783db316 MD |
4107 | bool ust_app_supports_notifiers(const struct ust_app *app) |
4108 | { | |
4109 | return app->v_major >= 9; | |
4110 | } | |
4111 | ||
4112 | bool ust_app_supports_counters(const struct ust_app *app) | |
4113 | { | |
4114 | return app->v_major >= 9; | |
4115 | } | |
4116 | ||
da873412 JR |
4117 | /* |
4118 | * Setup the base event notifier group. | |
4119 | * | |
4120 | * Return 0 on success else a negative value either an errno code or a | |
4121 | * LTTng-UST error code. | |
4122 | */ | |
4123 | int ust_app_setup_event_notifier_group(struct ust_app *app) | |
4124 | { | |
4125 | int ret; | |
4126 | int event_pipe_write_fd; | |
fc4b93fa | 4127 | struct lttng_ust_abi_object_data *event_notifier_group = NULL; |
da873412 | 4128 | enum lttng_error_code lttng_ret; |
533a90fb | 4129 | enum event_notifier_error_accounting_status event_notifier_error_accounting_status; |
da873412 | 4130 | |
a0377dfe | 4131 | LTTNG_ASSERT(app); |
da873412 | 4132 | |
783db316 MD |
4133 | if (!ust_app_supports_notifiers(app)) { |
4134 | ret = -ENOSYS; | |
4135 | goto error; | |
4136 | } | |
4137 | ||
da873412 JR |
4138 | /* Get the write side of the pipe. */ |
4139 | event_pipe_write_fd = lttng_pipe_get_writefd( | |
4140 | app->event_notifier_group.event_pipe); | |
4141 | ||
4142 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 4143 | ret = lttng_ust_ctl_create_event_notifier_group(app->sock, |
da873412 JR |
4144 | event_pipe_write_fd, &event_notifier_group); |
4145 | pthread_mutex_unlock(&app->sock_lock); | |
4146 | if (ret < 0) { | |
be355079 JR |
4147 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
4148 | ret = 0; | |
4149 | DBG3("UST app create event notifier group failed. Application is dead: pid = %d, sock = %d", | |
4150 | app->pid, app->sock); | |
4151 | } else if (ret == -EAGAIN) { | |
4152 | ret = 0; | |
4153 | WARN("UST app create event notifier group failed. Communication time out: pid = %d, sock = %d", | |
4154 | app->pid, app->sock); | |
da873412 | 4155 | } else { |
be355079 JR |
4156 | ERR("UST app create event notifier group failed with ret %d: pid = %d, sock = %d, event_pipe_write_fd: %d", |
4157 | ret, app->pid, app->sock, event_pipe_write_fd); | |
da873412 | 4158 | } |
da873412 JR |
4159 | goto error; |
4160 | } | |
4161 | ||
5d4193fd JG |
4162 | ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe); |
4163 | if (ret) { | |
be355079 JR |
4164 | ERR("Failed to close write end of the application's event source pipe: app = '%s' (pid = %d)", |
4165 | app->name, app->pid); | |
5d4193fd JG |
4166 | goto error; |
4167 | } | |
4168 | ||
5e2abfaf JG |
4169 | /* |
4170 | * Release the file descriptor that was reserved for the write-end of | |
4171 | * the pipe. | |
4172 | */ | |
4173 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
4174 | ||
da873412 | 4175 | lttng_ret = notification_thread_command_add_tracer_event_source( |
412d7227 SM |
4176 | the_notification_thread_handle, |
4177 | lttng_pipe_get_readfd( | |
4178 | app->event_notifier_group.event_pipe), | |
da873412 JR |
4179 | LTTNG_DOMAIN_UST); |
4180 | if (lttng_ret != LTTNG_OK) { | |
4181 | ERR("Failed to add tracer event source to notification thread"); | |
4182 | ret = - 1; | |
4183 | goto error; | |
4184 | } | |
4185 | ||
4186 | /* Assign handle only when the complete setup is valid. */ | |
4187 | app->event_notifier_group.object = event_notifier_group; | |
533a90fb | 4188 | |
a5a21280 FD |
4189 | event_notifier_error_accounting_status = |
4190 | event_notifier_error_accounting_register_app(app); | |
783db316 MD |
4191 | switch (event_notifier_error_accounting_status) { |
4192 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK: | |
4193 | break; | |
4194 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_UNSUPPORTED: | |
be355079 JR |
4195 | DBG3("Failed to setup event notifier error accounting (application does not support notifier error accounting): app socket fd = %d, app name = '%s', app pid = %d", |
4196 | app->sock, app->name, (int) app->pid); | |
783db316 MD |
4197 | ret = 0; |
4198 | goto error_accounting; | |
4199 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD: | |
be355079 JR |
4200 | DBG3("Failed to setup event notifier error accounting (application is dead): app socket fd = %d, app name = '%s', app pid = %d", |
4201 | app->sock, app->name, (int) app->pid); | |
783db316 MD |
4202 | ret = 0; |
4203 | goto error_accounting; | |
4204 | default: | |
533a90fb FD |
4205 | ERR("Failed to setup event notifier error accounting for app"); |
4206 | ret = -1; | |
cd9c532c | 4207 | goto error_accounting; |
533a90fb FD |
4208 | } |
4209 | ||
da873412 JR |
4210 | return ret; |
4211 | ||
cd9c532c FD |
4212 | error_accounting: |
4213 | lttng_ret = notification_thread_command_remove_tracer_event_source( | |
4214 | the_notification_thread_handle, | |
4215 | lttng_pipe_get_readfd( | |
4216 | app->event_notifier_group.event_pipe)); | |
4217 | if (lttng_ret != LTTNG_OK) { | |
4218 | ERR("Failed to remove application tracer event source from notification thread"); | |
4219 | } | |
4220 | ||
da873412 | 4221 | error: |
b623cb6a | 4222 | lttng_ust_ctl_release_object(app->sock, app->event_notifier_group.object); |
da873412 | 4223 | free(app->event_notifier_group.object); |
88631abd | 4224 | app->event_notifier_group.object = NULL; |
da873412 JR |
4225 | return ret; |
4226 | } | |
4227 | ||
5b4a0ec0 DG |
4228 | /* |
4229 | * Unregister app by removing it from the global traceable app list and freeing | |
4230 | * the data struct. | |
4231 | * | |
4232 | * The socket is already closed at this point so no close to sock. | |
4233 | */ | |
4234 | void ust_app_unregister(int sock) | |
4235 | { | |
4236 | struct ust_app *lta; | |
bec39940 | 4237 | struct lttng_ht_node_ulong *node; |
c4b88406 | 4238 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 4239 | struct lttng_ht_iter iter; |
d42f20df | 4240 | struct ust_app_session *ua_sess; |
525b0740 | 4241 | int ret; |
5b4a0ec0 DG |
4242 | |
4243 | rcu_read_lock(); | |
886459c6 | 4244 | |
5b4a0ec0 | 4245 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
4246 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
4247 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
a0377dfe | 4248 | LTTNG_ASSERT(node); |
284d8f55 | 4249 | |
852d0037 | 4250 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
4251 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
4252 | ||
d88aee68 | 4253 | /* |
ce34fcd0 MD |
4254 | * For per-PID buffers, perform "push metadata" and flush all |
4255 | * application streams before removing app from hash tables, | |
4256 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 4257 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 4258 | */ |
d42f20df DG |
4259 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
4260 | node.node) { | |
7972aab2 DG |
4261 | struct ust_registry_session *registry; |
4262 | ||
d42f20df DG |
4263 | ret = lttng_ht_del(lta->sessions, &iter); |
4264 | if (ret) { | |
4265 | /* The session was already removed so scheduled for teardown. */ | |
4266 | continue; | |
4267 | } | |
4268 | ||
ce34fcd0 MD |
4269 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
4270 | (void) ust_app_flush_app_session(lta, ua_sess); | |
4271 | } | |
c4b88406 | 4272 | |
d42f20df DG |
4273 | /* |
4274 | * Add session to list for teardown. This is safe since at this point we | |
4275 | * are the only one using this list. | |
4276 | */ | |
d88aee68 DG |
4277 | pthread_mutex_lock(&ua_sess->lock); |
4278 | ||
b161602a MD |
4279 | if (ua_sess->deleted) { |
4280 | pthread_mutex_unlock(&ua_sess->lock); | |
4281 | continue; | |
4282 | } | |
4283 | ||
d88aee68 DG |
4284 | /* |
4285 | * Normally, this is done in the delete session process which is | |
4286 | * executed in the call rcu below. However, upon registration we can't | |
4287 | * afford to wait for the grace period before pushing data or else the | |
4288 | * data pending feature can race between the unregistration and stop | |
4289 | * command where the data pending command is sent *before* the grace | |
4290 | * period ended. | |
4291 | * | |
4292 | * The close metadata below nullifies the metadata pointer in the | |
4293 | * session so the delete session will NOT push/close a second time. | |
4294 | */ | |
7972aab2 | 4295 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 4296 | if (registry) { |
7972aab2 DG |
4297 | /* Push metadata for application before freeing the application. */ |
4298 | (void) push_metadata(registry, ua_sess->consumer); | |
4299 | ||
4300 | /* | |
4301 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
4302 | * metadata only on destroy trace session in this case. Also, the |
4303 | * previous push metadata could have flag the metadata registry to | |
4304 | * close so don't send a close command if closed. | |
7972aab2 | 4305 | */ |
ce34fcd0 | 4306 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
4307 | /* And ask to close it for this session registry. */ |
4308 | (void) close_metadata(registry, ua_sess->consumer); | |
4309 | } | |
4310 | } | |
d42f20df | 4311 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 4312 | |
d88aee68 | 4313 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
4314 | } |
4315 | ||
c4b88406 MD |
4316 | /* Remove application from PID hash table */ |
4317 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
a0377dfe | 4318 | LTTNG_ASSERT(!ret); |
c4b88406 MD |
4319 | |
4320 | /* | |
4321 | * Remove application from notify hash table. The thread handling the | |
4322 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
4323 | * either way it's valid. The close of that socket is handled by the |
4324 | * apps_notify_thread. | |
c4b88406 MD |
4325 | */ |
4326 | iter.iter.node = <a->notify_sock_n.node; | |
4327 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4328 | ||
4329 | /* | |
4330 | * Ignore return value since the node might have been removed before by an | |
4331 | * add replace during app registration because the PID can be reassigned by | |
4332 | * the OS. | |
4333 | */ | |
4334 | iter.iter.node = <a->pid_n.node; | |
4335 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4336 | if (ret) { | |
4337 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
4338 | lta->pid); | |
4339 | } | |
4340 | ||
852d0037 DG |
4341 | /* Free memory */ |
4342 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
4343 | ||
5b4a0ec0 DG |
4344 | rcu_read_unlock(); |
4345 | return; | |
284d8f55 DG |
4346 | } |
4347 | ||
5b4a0ec0 DG |
4348 | /* |
4349 | * Fill events array with all events name of all registered apps. | |
4350 | */ | |
4351 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 4352 | { |
5b4a0ec0 DG |
4353 | int ret, handle; |
4354 | size_t nbmem, count = 0; | |
bec39940 | 4355 | struct lttng_ht_iter iter; |
5b4a0ec0 | 4356 | struct ust_app *app; |
c617c0c6 | 4357 | struct lttng_event *tmp_event; |
421cb601 | 4358 | |
5b4a0ec0 | 4359 | nbmem = UST_APP_EVENT_LIST_SIZE; |
7966af57 | 4360 | tmp_event = (lttng_event *) zmalloc(nbmem * sizeof(struct lttng_event)); |
c617c0c6 | 4361 | if (tmp_event == NULL) { |
5b4a0ec0 DG |
4362 | PERROR("zmalloc ust app events"); |
4363 | ret = -ENOMEM; | |
421cb601 DG |
4364 | goto error; |
4365 | } | |
4366 | ||
5b4a0ec0 | 4367 | rcu_read_lock(); |
421cb601 | 4368 | |
852d0037 | 4369 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
fc4b93fa | 4370 | struct lttng_ust_abi_tracepoint_iter uiter; |
ac3bd9c0 | 4371 | |
840cb59c | 4372 | health_code_update(); |
86acf0da | 4373 | |
e0c7ec2b DG |
4374 | if (!app->compatible) { |
4375 | /* | |
4376 | * TODO: In time, we should notice the caller of this error by | |
4377 | * telling him that this is a version error. | |
4378 | */ | |
4379 | continue; | |
4380 | } | |
fb45065e | 4381 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 4382 | handle = lttng_ust_ctl_tracepoint_list(app->sock); |
5b4a0ec0 | 4383 | if (handle < 0) { |
ffe60014 DG |
4384 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4385 | ERR("UST app list events getting handle failed for app pid %d", | |
4386 | app->pid); | |
4387 | } | |
fb45065e | 4388 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
4389 | continue; |
4390 | } | |
421cb601 | 4391 | |
b623cb6a | 4392 | while ((ret = lttng_ust_ctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 4393 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4394 | /* Handle ustctl error. */ |
4395 | if (ret < 0) { | |
fb45065e MD |
4396 | int release_ret; |
4397 | ||
a2ba1ab0 | 4398 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4399 | ERR("UST app tp list get failed for app %d with ret %d", |
4400 | app->sock, ret); | |
4401 | } else { | |
4402 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 | 4403 | break; |
ffe60014 | 4404 | } |
98f595d4 | 4405 | free(tmp_event); |
b623cb6a | 4406 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
68313703 JG |
4407 | if (release_ret < 0 && |
4408 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4409 | release_ret != -EPIPE) { | |
fb45065e MD |
4410 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4411 | } | |
4412 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
4413 | goto rcu_error; |
4414 | } | |
4415 | ||
840cb59c | 4416 | health_code_update(); |
815564d8 | 4417 | if (count >= nbmem) { |
d7b3776f | 4418 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4419 | struct lttng_event *new_tmp_event; |
4420 | size_t new_nbmem; | |
4421 | ||
4422 | new_nbmem = nbmem << 1; | |
4423 | DBG2("Reallocating event list from %zu to %zu entries", | |
4424 | nbmem, new_nbmem); | |
7966af57 | 4425 | new_tmp_event = (lttng_event *) realloc(tmp_event, |
53efb85a MD |
4426 | new_nbmem * sizeof(struct lttng_event)); |
4427 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4428 | int release_ret; |
4429 | ||
5b4a0ec0 | 4430 | PERROR("realloc ust app events"); |
c617c0c6 | 4431 | free(tmp_event); |
5b4a0ec0 | 4432 | ret = -ENOMEM; |
b623cb6a | 4433 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
68313703 JG |
4434 | if (release_ret < 0 && |
4435 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4436 | release_ret != -EPIPE) { | |
fb45065e MD |
4437 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4438 | } | |
4439 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
4440 | goto rcu_error; |
4441 | } | |
53efb85a MD |
4442 | /* Zero the new memory */ |
4443 | memset(new_tmp_event + nbmem, 0, | |
4444 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4445 | nbmem = new_nbmem; | |
4446 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4447 | } |
fc4b93fa | 4448 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4449 | tmp_event[count].loglevel = uiter.loglevel; |
fc4b93fa | 4450 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_ABI_TRACEPOINT; |
c617c0c6 MD |
4451 | tmp_event[count].pid = app->pid; |
4452 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4453 | count++; |
421cb601 | 4454 | } |
b623cb6a | 4455 | ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4456 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
4457 | if (ret < 0) { |
4458 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
4459 | DBG3("Error releasing app handle. Application died: pid = %d, sock = %d", | |
4460 | app->pid, app->sock); | |
4461 | } else if (ret == -EAGAIN) { | |
4462 | WARN("Error releasing app handle. Communication time out: pid = %d, sock = %d", | |
4463 | app->pid, app->sock); | |
4464 | } else { | |
4465 | ERR("Error releasing app handle with ret %d: pid = %d, sock = %d", | |
4466 | ret, app->pid, app->sock); | |
4467 | } | |
fb45065e | 4468 | } |
421cb601 DG |
4469 | } |
4470 | ||
5b4a0ec0 | 4471 | ret = count; |
c617c0c6 | 4472 | *events = tmp_event; |
421cb601 | 4473 | |
5b4a0ec0 | 4474 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4475 | |
5b4a0ec0 DG |
4476 | rcu_error: |
4477 | rcu_read_unlock(); | |
421cb601 | 4478 | error: |
840cb59c | 4479 | health_code_update(); |
5b4a0ec0 | 4480 | return ret; |
421cb601 DG |
4481 | } |
4482 | ||
f37d259d MD |
4483 | /* |
4484 | * Fill events array with all events name of all registered apps. | |
4485 | */ | |
4486 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4487 | { | |
4488 | int ret, handle; | |
4489 | size_t nbmem, count = 0; | |
4490 | struct lttng_ht_iter iter; | |
4491 | struct ust_app *app; | |
c617c0c6 | 4492 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4493 | |
4494 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
7966af57 | 4495 | tmp_event = (lttng_event_field *) zmalloc(nbmem * sizeof(struct lttng_event_field)); |
c617c0c6 | 4496 | if (tmp_event == NULL) { |
f37d259d MD |
4497 | PERROR("zmalloc ust app event fields"); |
4498 | ret = -ENOMEM; | |
4499 | goto error; | |
4500 | } | |
4501 | ||
4502 | rcu_read_lock(); | |
4503 | ||
4504 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
fc4b93fa | 4505 | struct lttng_ust_abi_field_iter uiter; |
f37d259d | 4506 | |
840cb59c | 4507 | health_code_update(); |
86acf0da | 4508 | |
f37d259d MD |
4509 | if (!app->compatible) { |
4510 | /* | |
4511 | * TODO: In time, we should notice the caller of this error by | |
4512 | * telling him that this is a version error. | |
4513 | */ | |
4514 | continue; | |
4515 | } | |
fb45065e | 4516 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 4517 | handle = lttng_ust_ctl_tracepoint_field_list(app->sock); |
f37d259d | 4518 | if (handle < 0) { |
ffe60014 DG |
4519 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4520 | ERR("UST app list field getting handle failed for app pid %d", | |
4521 | app->pid); | |
4522 | } | |
fb45065e | 4523 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4524 | continue; |
4525 | } | |
4526 | ||
b623cb6a | 4527 | while ((ret = lttng_ust_ctl_tracepoint_field_list_get(app->sock, handle, |
fb54cdbf | 4528 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4529 | /* Handle ustctl error. */ |
4530 | if (ret < 0) { | |
fb45065e MD |
4531 | int release_ret; |
4532 | ||
a2ba1ab0 | 4533 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4534 | ERR("UST app tp list field failed for app %d with ret %d", |
4535 | app->sock, ret); | |
4536 | } else { | |
4537 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 | 4538 | break; |
ffe60014 | 4539 | } |
98f595d4 | 4540 | free(tmp_event); |
b623cb6a | 4541 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4542 | pthread_mutex_unlock(&app->sock_lock); |
68313703 JG |
4543 | if (release_ret < 0 && |
4544 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4545 | release_ret != -EPIPE) { | |
fb45065e MD |
4546 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4547 | } | |
ffe60014 DG |
4548 | goto rcu_error; |
4549 | } | |
4550 | ||
840cb59c | 4551 | health_code_update(); |
f37d259d | 4552 | if (count >= nbmem) { |
d7b3776f | 4553 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4554 | struct lttng_event_field *new_tmp_event; |
4555 | size_t new_nbmem; | |
4556 | ||
4557 | new_nbmem = nbmem << 1; | |
4558 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4559 | nbmem, new_nbmem); | |
7966af57 | 4560 | new_tmp_event = (lttng_event_field *) realloc(tmp_event, |
53efb85a MD |
4561 | new_nbmem * sizeof(struct lttng_event_field)); |
4562 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4563 | int release_ret; |
4564 | ||
f37d259d | 4565 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4566 | free(tmp_event); |
f37d259d | 4567 | ret = -ENOMEM; |
b623cb6a | 4568 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4569 | pthread_mutex_unlock(&app->sock_lock); |
68313703 JG |
4570 | if (release_ret && |
4571 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4572 | release_ret != -EPIPE) { | |
fb45065e MD |
4573 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4574 | } | |
f37d259d MD |
4575 | goto rcu_error; |
4576 | } | |
53efb85a MD |
4577 | /* Zero the new memory */ |
4578 | memset(new_tmp_event + nbmem, 0, | |
4579 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4580 | nbmem = new_nbmem; | |
4581 | tmp_event = new_tmp_event; | |
f37d259d | 4582 | } |
f37d259d | 4583 | |
fc4b93fa | 4584 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
2e84128e DG |
4585 | /* Mapping between these enums matches 1 to 1. */ |
4586 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4587 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4588 | |
fc4b93fa | 4589 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4590 | tmp_event[count].event.loglevel = uiter.loglevel; |
2e84128e | 4591 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4592 | tmp_event[count].event.pid = app->pid; |
4593 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4594 | count++; |
4595 | } | |
b623cb6a | 4596 | ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4597 | pthread_mutex_unlock(&app->sock_lock); |
68313703 JG |
4598 | if (ret < 0 && |
4599 | ret != -LTTNG_UST_ERR_EXITING && | |
4600 | ret != -EPIPE) { | |
fb45065e MD |
4601 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4602 | } | |
f37d259d MD |
4603 | } |
4604 | ||
4605 | ret = count; | |
c617c0c6 | 4606 | *fields = tmp_event; |
f37d259d MD |
4607 | |
4608 | DBG2("UST app list event fields done (%zu events)", count); | |
4609 | ||
4610 | rcu_error: | |
4611 | rcu_read_unlock(); | |
4612 | error: | |
840cb59c | 4613 | health_code_update(); |
f37d259d MD |
4614 | return ret; |
4615 | } | |
4616 | ||
5b4a0ec0 DG |
4617 | /* |
4618 | * Free and clean all traceable apps of the global list. | |
4619 | */ | |
4620 | void ust_app_clean_list(void) | |
421cb601 | 4621 | { |
5b4a0ec0 | 4622 | int ret; |
659ed79f | 4623 | struct ust_app *app; |
bec39940 | 4624 | struct lttng_ht_iter iter; |
421cb601 | 4625 | |
5b4a0ec0 | 4626 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4627 | |
5b4a0ec0 | 4628 | rcu_read_lock(); |
421cb601 | 4629 | |
faadaa3a JG |
4630 | /* Cleanup notify socket hash table */ |
4631 | if (ust_app_ht_by_notify_sock) { | |
4632 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4633 | notify_sock_n.node) { | |
b69a1b40 JG |
4634 | /* |
4635 | * Assert that all notifiers are gone as all triggers | |
4636 | * are unregistered prior to this clean-up. | |
4637 | */ | |
a0377dfe | 4638 | LTTNG_ASSERT(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0); |
faadaa3a | 4639 | |
faadaa3a JG |
4640 | ust_app_notify_sock_unregister(app->notify_sock); |
4641 | } | |
4642 | } | |
4643 | ||
f1b711c4 MD |
4644 | if (ust_app_ht) { |
4645 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4646 | ret = lttng_ht_del(ust_app_ht, &iter); | |
a0377dfe | 4647 | LTTNG_ASSERT(!ret); |
f1b711c4 MD |
4648 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
4649 | } | |
421cb601 DG |
4650 | } |
4651 | ||
852d0037 | 4652 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4653 | if (ust_app_ht_by_sock) { |
4654 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4655 | sock_n.node) { | |
4656 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
a0377dfe | 4657 | LTTNG_ASSERT(!ret); |
f1b711c4 | 4658 | } |
bec39940 | 4659 | } |
852d0037 | 4660 | |
36b588ed | 4661 | rcu_read_unlock(); |
d88aee68 | 4662 | |
bec39940 | 4663 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4664 | if (ust_app_ht) { |
4665 | ht_cleanup_push(ust_app_ht); | |
4666 | } | |
4667 | if (ust_app_ht_by_sock) { | |
4668 | ht_cleanup_push(ust_app_ht_by_sock); | |
4669 | } | |
4670 | if (ust_app_ht_by_notify_sock) { | |
4671 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4672 | } | |
5b4a0ec0 DG |
4673 | } |
4674 | ||
4675 | /* | |
4676 | * Init UST app hash table. | |
4677 | */ | |
57703f6e | 4678 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4679 | { |
bec39940 | 4680 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4681 | if (!ust_app_ht) { |
4682 | return -1; | |
4683 | } | |
852d0037 | 4684 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4685 | if (!ust_app_ht_by_sock) { |
4686 | return -1; | |
4687 | } | |
d0b96690 | 4688 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4689 | if (!ust_app_ht_by_notify_sock) { |
4690 | return -1; | |
4691 | } | |
4692 | return 0; | |
421cb601 DG |
4693 | } |
4694 | ||
78f0bacd DG |
4695 | /* |
4696 | * For a specific UST session, disable the channel for all registered apps. | |
4697 | */ | |
35a9059d | 4698 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4699 | struct ltt_ust_channel *uchan) |
4700 | { | |
4701 | int ret = 0; | |
bec39940 DG |
4702 | struct lttng_ht_iter iter; |
4703 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4704 | struct ust_app *app; |
4705 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4706 | struct ust_app_channel *ua_chan; |
78f0bacd | 4707 | |
a0377dfe | 4708 | LTTNG_ASSERT(usess->active); |
d9bf3ca4 | 4709 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4710 | uchan->name, usess->id); |
78f0bacd DG |
4711 | |
4712 | rcu_read_lock(); | |
4713 | ||
4714 | /* For every registered applications */ | |
852d0037 | 4715 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4716 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4717 | if (!app->compatible) { |
4718 | /* | |
4719 | * TODO: In time, we should notice the caller of this error by | |
4720 | * telling him that this is a version error. | |
4721 | */ | |
4722 | continue; | |
4723 | } | |
78f0bacd DG |
4724 | ua_sess = lookup_session_by_app(usess, app); |
4725 | if (ua_sess == NULL) { | |
4726 | continue; | |
4727 | } | |
4728 | ||
8535a6d9 | 4729 | /* Get channel */ |
bec39940 DG |
4730 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4731 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 | 4732 | /* If the session if found for the app, the channel must be there */ |
a0377dfe | 4733 | LTTNG_ASSERT(ua_chan_node); |
8535a6d9 DG |
4734 | |
4735 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4736 | /* The channel must not be already disabled */ | |
a0377dfe | 4737 | LTTNG_ASSERT(ua_chan->enabled == 1); |
8535a6d9 DG |
4738 | |
4739 | /* Disable channel onto application */ | |
4740 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4741 | if (ret < 0) { |
4742 | /* XXX: We might want to report this error at some point... */ | |
4743 | continue; | |
4744 | } | |
4745 | } | |
4746 | ||
4747 | rcu_read_unlock(); | |
78f0bacd DG |
4748 | return ret; |
4749 | } | |
4750 | ||
4751 | /* | |
4752 | * For a specific UST session, enable the channel for all registered apps. | |
4753 | */ | |
35a9059d | 4754 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4755 | struct ltt_ust_channel *uchan) |
4756 | { | |
4757 | int ret = 0; | |
bec39940 | 4758 | struct lttng_ht_iter iter; |
78f0bacd DG |
4759 | struct ust_app *app; |
4760 | struct ust_app_session *ua_sess; | |
4761 | ||
a0377dfe | 4762 | LTTNG_ASSERT(usess->active); |
d9bf3ca4 | 4763 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4764 | uchan->name, usess->id); |
78f0bacd DG |
4765 | |
4766 | rcu_read_lock(); | |
4767 | ||
4768 | /* For every registered applications */ | |
852d0037 | 4769 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4770 | if (!app->compatible) { |
4771 | /* | |
4772 | * TODO: In time, we should notice the caller of this error by | |
4773 | * telling him that this is a version error. | |
4774 | */ | |
4775 | continue; | |
4776 | } | |
78f0bacd DG |
4777 | ua_sess = lookup_session_by_app(usess, app); |
4778 | if (ua_sess == NULL) { | |
4779 | continue; | |
4780 | } | |
4781 | ||
4782 | /* Enable channel onto application */ | |
4783 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4784 | if (ret < 0) { | |
4785 | /* XXX: We might want to report this error at some point... */ | |
4786 | continue; | |
4787 | } | |
4788 | } | |
4789 | ||
4790 | rcu_read_unlock(); | |
78f0bacd DG |
4791 | return ret; |
4792 | } | |
4793 | ||
b0a40d28 DG |
4794 | /* |
4795 | * Disable an event in a channel and for a specific session. | |
4796 | */ | |
35a9059d DG |
4797 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4798 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4799 | { |
4800 | int ret = 0; | |
bec39940 | 4801 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4802 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4803 | struct ust_app *app; |
4804 | struct ust_app_session *ua_sess; | |
4805 | struct ust_app_channel *ua_chan; | |
4806 | struct ust_app_event *ua_event; | |
4807 | ||
a0377dfe | 4808 | LTTNG_ASSERT(usess->active); |
b0a40d28 | 4809 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4810 | "%s for session id %" PRIu64, |
4811 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4812 | |
4813 | rcu_read_lock(); | |
4814 | ||
4815 | /* For all registered applications */ | |
852d0037 | 4816 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4817 | if (!app->compatible) { |
4818 | /* | |
4819 | * TODO: In time, we should notice the caller of this error by | |
4820 | * telling him that this is a version error. | |
4821 | */ | |
4822 | continue; | |
4823 | } | |
b0a40d28 DG |
4824 | ua_sess = lookup_session_by_app(usess, app); |
4825 | if (ua_sess == NULL) { | |
4826 | /* Next app */ | |
4827 | continue; | |
4828 | } | |
4829 | ||
4830 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4831 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4832 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4833 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4834 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4835 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4836 | continue; |
4837 | } | |
4838 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4839 | ||
700c5a9d JR |
4840 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4841 | uevent->filter, uevent->attr.loglevel, | |
4842 | uevent->exclusion); | |
4843 | if (ua_event == NULL) { | |
b0a40d28 | 4844 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4845 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4846 | continue; |
4847 | } | |
b0a40d28 | 4848 | |
7f79d3a1 | 4849 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4850 | if (ret < 0) { |
4851 | /* XXX: Report error someday... */ | |
4852 | continue; | |
4853 | } | |
4854 | } | |
4855 | ||
4856 | rcu_read_unlock(); | |
88e3c2f5 JG |
4857 | return ret; |
4858 | } | |
4859 | ||
4860 | /* The ua_sess lock must be held by the caller. */ | |
4861 | static | |
4862 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4863 | struct ust_app_session *ua_sess, | |
4864 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4865 | struct ust_app_channel **_ua_chan) | |
4866 | { | |
4867 | int ret = 0; | |
4868 | struct ust_app_channel *ua_chan = NULL; | |
4869 | ||
a0377dfe | 4870 | LTTNG_ASSERT(ua_sess); |
88e3c2f5 JG |
4871 | ASSERT_LOCKED(ua_sess->lock); |
4872 | ||
4873 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4874 | sizeof(uchan->name))) { | |
4875 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4876 | &uchan->attr); | |
4877 | ret = 0; | |
4878 | } else { | |
4879 | struct ltt_ust_context *uctx = NULL; | |
4880 | ||
4881 | /* | |
4882 | * Create channel onto application and synchronize its | |
4883 | * configuration. | |
4884 | */ | |
4885 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
fc4b93fa | 4886 | LTTNG_UST_ABI_CHAN_PER_CPU, usess, |
88e3c2f5 | 4887 | &ua_chan); |
88ebf5a7 JR |
4888 | if (ret < 0) { |
4889 | goto error; | |
4890 | } | |
4891 | ||
4892 | ret = ust_app_channel_send(app, usess, | |
4893 | ua_sess, ua_chan); | |
4894 | if (ret) { | |
4895 | goto error; | |
88e3c2f5 JG |
4896 | } |
4897 | ||
4898 | /* Add contexts. */ | |
4899 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4900 | ret = create_ust_app_channel_context(ua_chan, | |
4901 | &uctx->ctx, app); | |
4902 | if (ret) { | |
88ebf5a7 | 4903 | goto error; |
88e3c2f5 JG |
4904 | } |
4905 | } | |
4906 | } | |
88ebf5a7 JR |
4907 | |
4908 | error: | |
88e3c2f5 JG |
4909 | if (ret < 0) { |
4910 | switch (ret) { | |
4911 | case -ENOTCONN: | |
4912 | /* | |
4913 | * The application's socket is not valid. Either a bad socket | |
4914 | * or a timeout on it. We can't inform the caller that for a | |
4915 | * specific app, the session failed so lets continue here. | |
4916 | */ | |
4917 | ret = 0; /* Not an error. */ | |
4918 | break; | |
4919 | case -ENOMEM: | |
4920 | default: | |
4921 | break; | |
4922 | } | |
4923 | } | |
88ebf5a7 | 4924 | |
88e3c2f5 JG |
4925 | if (ret == 0 && _ua_chan) { |
4926 | /* | |
4927 | * Only return the application's channel on success. Note | |
4928 | * that the channel can still be part of the application's | |
4929 | * channel hashtable on error. | |
4930 | */ | |
4931 | *_ua_chan = ua_chan; | |
4932 | } | |
b0a40d28 DG |
4933 | return ret; |
4934 | } | |
4935 | ||
5b4a0ec0 | 4936 | /* |
edb67388 | 4937 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4938 | */ |
35a9059d | 4939 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4940 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4941 | { | |
4942 | int ret = 0; | |
bec39940 | 4943 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4944 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4945 | struct ust_app *app; |
4946 | struct ust_app_session *ua_sess; | |
4947 | struct ust_app_channel *ua_chan; | |
4948 | struct ust_app_event *ua_event; | |
48842b30 | 4949 | |
a0377dfe | 4950 | LTTNG_ASSERT(usess->active); |
d9bf3ca4 | 4951 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4952 | uevent->attr.name, usess->id); |
48842b30 | 4953 | |
edb67388 DG |
4954 | /* |
4955 | * NOTE: At this point, this function is called only if the session and | |
4956 | * channel passed are already created for all apps. and enabled on the | |
4957 | * tracer also. | |
4958 | */ | |
4959 | ||
48842b30 | 4960 | rcu_read_lock(); |
421cb601 DG |
4961 | |
4962 | /* For all registered applications */ | |
852d0037 | 4963 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4964 | if (!app->compatible) { |
4965 | /* | |
4966 | * TODO: In time, we should notice the caller of this error by | |
4967 | * telling him that this is a version error. | |
4968 | */ | |
4969 | continue; | |
4970 | } | |
edb67388 | 4971 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4972 | if (!ua_sess) { |
4973 | /* The application has problem or is probably dead. */ | |
4974 | continue; | |
4975 | } | |
ba767faf | 4976 | |
d0b96690 DG |
4977 | pthread_mutex_lock(&ua_sess->lock); |
4978 | ||
b161602a MD |
4979 | if (ua_sess->deleted) { |
4980 | pthread_mutex_unlock(&ua_sess->lock); | |
4981 | continue; | |
4982 | } | |
4983 | ||
edb67388 | 4984 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4985 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4986 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4987 | /* |
4988 | * It is possible that the channel cannot be found is | |
4989 | * the channel/event creation occurs concurrently with | |
4990 | * an application exit. | |
4991 | */ | |
4992 | if (!ua_chan_node) { | |
4993 | pthread_mutex_unlock(&ua_sess->lock); | |
4994 | continue; | |
4995 | } | |
edb67388 DG |
4996 | |
4997 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4998 | ||
18eace3b DG |
4999 | /* Get event node */ |
5000 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 5001 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 5002 | if (ua_event == NULL) { |
7f79d3a1 | 5003 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 5004 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 5005 | goto next_app; |
35a9059d | 5006 | } |
35a9059d DG |
5007 | |
5008 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
5009 | if (ret < 0) { | |
d0b96690 | 5010 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 5011 | goto error; |
48842b30 | 5012 | } |
d0b96690 DG |
5013 | next_app: |
5014 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
5015 | } |
5016 | ||
7f79d3a1 | 5017 | error: |
edb67388 | 5018 | rcu_read_unlock(); |
edb67388 DG |
5019 | return ret; |
5020 | } | |
5021 | ||
5022 | /* | |
5023 | * For a specific existing UST session and UST channel, creates the event for | |
5024 | * all registered apps. | |
5025 | */ | |
35a9059d | 5026 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
5027 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
5028 | { | |
5029 | int ret = 0; | |
bec39940 DG |
5030 | struct lttng_ht_iter iter, uiter; |
5031 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
5032 | struct ust_app *app; |
5033 | struct ust_app_session *ua_sess; | |
5034 | struct ust_app_channel *ua_chan; | |
5035 | ||
a0377dfe | 5036 | LTTNG_ASSERT(usess->active); |
d9bf3ca4 | 5037 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 5038 | uevent->attr.name, usess->id); |
edb67388 | 5039 | |
edb67388 DG |
5040 | rcu_read_lock(); |
5041 | ||
5042 | /* For all registered applications */ | |
852d0037 | 5043 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5044 | if (!app->compatible) { |
5045 | /* | |
5046 | * TODO: In time, we should notice the caller of this error by | |
5047 | * telling him that this is a version error. | |
5048 | */ | |
5049 | continue; | |
5050 | } | |
edb67388 | 5051 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
5052 | if (!ua_sess) { |
5053 | /* The application has problem or is probably dead. */ | |
5054 | continue; | |
5055 | } | |
48842b30 | 5056 | |
d0b96690 | 5057 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5058 | |
5059 | if (ua_sess->deleted) { | |
5060 | pthread_mutex_unlock(&ua_sess->lock); | |
5061 | continue; | |
5062 | } | |
5063 | ||
48842b30 | 5064 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5065 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5066 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 | 5067 | /* If the channel is not found, there is a code flow error */ |
a0377dfe | 5068 | LTTNG_ASSERT(ua_chan_node); |
edb67388 | 5069 | |
48842b30 DG |
5070 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
5071 | ||
edb67388 | 5072 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 5073 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 5074 | if (ret < 0) { |
49c336c1 | 5075 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
5076 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
5077 | break; | |
5078 | } | |
5079 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 5080 | uevent->attr.name, app->pid); |
5b4a0ec0 | 5081 | continue; |
48842b30 | 5082 | } |
48842b30 | 5083 | } |
5b4a0ec0 | 5084 | |
48842b30 | 5085 | rcu_read_unlock(); |
48842b30 DG |
5086 | return ret; |
5087 | } | |
5088 | ||
5b4a0ec0 DG |
5089 | /* |
5090 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
5091 | * |
5092 | * Called with UST app session lock held. | |
5093 | * | |
5b4a0ec0 | 5094 | */ |
b34cbebf | 5095 | static |
421cb601 | 5096 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
5097 | { |
5098 | int ret = 0; | |
48842b30 | 5099 | struct ust_app_session *ua_sess; |
48842b30 | 5100 | |
852d0037 | 5101 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 5102 | |
509cbaf8 MD |
5103 | rcu_read_lock(); |
5104 | ||
e0c7ec2b DG |
5105 | if (!app->compatible) { |
5106 | goto end; | |
5107 | } | |
5108 | ||
421cb601 DG |
5109 | ua_sess = lookup_session_by_app(usess, app); |
5110 | if (ua_sess == NULL) { | |
d42f20df DG |
5111 | /* The session is in teardown process. Ignore and continue. */ |
5112 | goto end; | |
421cb601 | 5113 | } |
48842b30 | 5114 | |
d0b96690 DG |
5115 | pthread_mutex_lock(&ua_sess->lock); |
5116 | ||
b161602a MD |
5117 | if (ua_sess->deleted) { |
5118 | pthread_mutex_unlock(&ua_sess->lock); | |
5119 | goto end; | |
5120 | } | |
5121 | ||
b0a1c741 JR |
5122 | if (ua_sess->enabled) { |
5123 | pthread_mutex_unlock(&ua_sess->lock); | |
5124 | goto end; | |
5125 | } | |
5126 | ||
aea829b3 DG |
5127 | /* Upon restart, we skip the setup, already done */ |
5128 | if (ua_sess->started) { | |
8be98f9a | 5129 | goto skip_setup; |
aea829b3 | 5130 | } |
8be98f9a | 5131 | |
840cb59c | 5132 | health_code_update(); |
86acf0da | 5133 | |
8be98f9a | 5134 | skip_setup: |
a945cdc7 | 5135 | /* This starts the UST tracing */ |
fb45065e | 5136 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5137 | ret = lttng_ust_ctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 5138 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 5139 | if (ret < 0) { |
be355079 JR |
5140 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
5141 | DBG3("UST app start session failed. Application is dead: pid = %d, sock = %d", | |
5142 | app->pid, app->sock); | |
5143 | pthread_mutex_unlock(&ua_sess->lock); | |
5144 | goto end; | |
5145 | } else if (ret == -EAGAIN) { | |
5146 | WARN("UST app start session failed. Communication time out: pid = %d, sock = %d", | |
5147 | app->pid, app->sock); | |
3757b385 DG |
5148 | pthread_mutex_unlock(&ua_sess->lock); |
5149 | goto end; | |
be355079 JR |
5150 | |
5151 | } else { | |
5152 | ERR("UST app start session failed with ret %d: pid = %d, sock = %d", | |
5153 | ret, app->pid, app->sock); | |
ffe60014 | 5154 | } |
d0b96690 | 5155 | goto error_unlock; |
421cb601 | 5156 | } |
5b4a0ec0 | 5157 | |
55c3953d DG |
5158 | /* Indicate that the session has been started once */ |
5159 | ua_sess->started = 1; | |
b0a1c741 | 5160 | ua_sess->enabled = 1; |
55c3953d | 5161 | |
d0b96690 DG |
5162 | pthread_mutex_unlock(&ua_sess->lock); |
5163 | ||
840cb59c | 5164 | health_code_update(); |
86acf0da | 5165 | |
421cb601 | 5166 | /* Quiescent wait after starting trace */ |
fb45065e | 5167 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5168 | ret = lttng_ust_ctl_wait_quiescent(app->sock); |
fb45065e | 5169 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
5170 | if (ret < 0) { |
5171 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
5172 | DBG3("UST app wait quiescent failed. Application is dead: pid = %d, sock = %d", | |
5173 | app->pid, app->sock); | |
5174 | } else if (ret == -EAGAIN) { | |
5175 | WARN("UST app wait quiescent failed. Communication time out: pid = %d, sock = %d", | |
5176 | app->pid, app->sock); | |
5177 | } else { | |
5178 | ERR("UST app wait quiescent failed with ret %d: pid %d, sock = %d", | |
5179 | ret, app->pid, app->sock); | |
5180 | } | |
ffe60014 | 5181 | } |
48842b30 | 5182 | |
e0c7ec2b DG |
5183 | end: |
5184 | rcu_read_unlock(); | |
840cb59c | 5185 | health_code_update(); |
421cb601 | 5186 | return 0; |
48842b30 | 5187 | |
d0b96690 DG |
5188 | error_unlock: |
5189 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 5190 | rcu_read_unlock(); |
840cb59c | 5191 | health_code_update(); |
421cb601 DG |
5192 | return -1; |
5193 | } | |
48842b30 | 5194 | |
8be98f9a MD |
5195 | /* |
5196 | * Stop tracing for a specific UST session and app. | |
5197 | */ | |
b34cbebf | 5198 | static |
8be98f9a MD |
5199 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
5200 | { | |
5201 | int ret = 0; | |
5202 | struct ust_app_session *ua_sess; | |
7972aab2 | 5203 | struct ust_registry_session *registry; |
8be98f9a | 5204 | |
852d0037 | 5205 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
5206 | |
5207 | rcu_read_lock(); | |
5208 | ||
e0c7ec2b | 5209 | if (!app->compatible) { |
d88aee68 | 5210 | goto end_no_session; |
e0c7ec2b DG |
5211 | } |
5212 | ||
8be98f9a MD |
5213 | ua_sess = lookup_session_by_app(usess, app); |
5214 | if (ua_sess == NULL) { | |
d88aee68 | 5215 | goto end_no_session; |
8be98f9a MD |
5216 | } |
5217 | ||
d88aee68 DG |
5218 | pthread_mutex_lock(&ua_sess->lock); |
5219 | ||
b161602a MD |
5220 | if (ua_sess->deleted) { |
5221 | pthread_mutex_unlock(&ua_sess->lock); | |
5222 | goto end_no_session; | |
5223 | } | |
5224 | ||
9bc07046 DG |
5225 | /* |
5226 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
5227 | * that was never started. It's possible since we can have a fail start |
5228 | * from either the application manager thread or the command thread. Simply | |
5229 | * indicate that this is a stop error. | |
9bc07046 | 5230 | */ |
f9dfc3d9 | 5231 | if (!ua_sess->started) { |
c45536e1 DG |
5232 | goto error_rcu_unlock; |
5233 | } | |
7db205b5 | 5234 | |
840cb59c | 5235 | health_code_update(); |
86acf0da | 5236 | |
9d6c7d3f | 5237 | /* This inhibits UST tracing */ |
fb45065e | 5238 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5239 | ret = lttng_ust_ctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 5240 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 5241 | if (ret < 0) { |
be355079 JR |
5242 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
5243 | DBG3("UST app stop session failed. Application is dead: pid = %d, sock = %d", | |
5244 | app->pid, app->sock); | |
3757b385 | 5245 | goto end_unlock; |
be355079 JR |
5246 | } else if (ret == -EAGAIN) { |
5247 | WARN("UST app stop session failed. Communication time out: pid = %d, sock = %d", | |
5248 | app->pid, app->sock); | |
5249 | goto end_unlock; | |
5250 | ||
5251 | } else { | |
5252 | ERR("UST app stop session failed with ret %d: pid = %d, sock = %d", | |
5253 | ret, app->pid, app->sock); | |
ffe60014 | 5254 | } |
9d6c7d3f DG |
5255 | goto error_rcu_unlock; |
5256 | } | |
5257 | ||
840cb59c | 5258 | health_code_update(); |
b0a1c741 | 5259 | ua_sess->enabled = 0; |
86acf0da | 5260 | |
9d6c7d3f | 5261 | /* Quiescent wait after stopping trace */ |
fb45065e | 5262 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5263 | ret = lttng_ust_ctl_wait_quiescent(app->sock); |
fb45065e | 5264 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
5265 | if (ret < 0) { |
5266 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
9324443a | 5267 | DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d", |
be355079 JR |
5268 | app->pid, app->sock); |
5269 | } else if (ret == -EAGAIN) { | |
9324443a | 5270 | WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d", |
be355079 JR |
5271 | app->pid, app->sock); |
5272 | } else { | |
9324443a | 5273 | ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d", |
be355079 JR |
5274 | ret, app->pid, app->sock); |
5275 | } | |
ffe60014 | 5276 | } |
9d6c7d3f | 5277 | |
840cb59c | 5278 | health_code_update(); |
86acf0da | 5279 | |
b34cbebf | 5280 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5281 | |
5282 | /* The UST app session is held registry shall not be null. */ | |
a0377dfe | 5283 | LTTNG_ASSERT(registry); |
1b532a60 | 5284 | |
ce34fcd0 MD |
5285 | /* Push metadata for application before freeing the application. */ |
5286 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 5287 | |
3757b385 | 5288 | end_unlock: |
b34cbebf MD |
5289 | pthread_mutex_unlock(&ua_sess->lock); |
5290 | end_no_session: | |
5291 | rcu_read_unlock(); | |
5292 | health_code_update(); | |
5293 | return 0; | |
5294 | ||
5295 | error_rcu_unlock: | |
5296 | pthread_mutex_unlock(&ua_sess->lock); | |
5297 | rcu_read_unlock(); | |
5298 | health_code_update(); | |
5299 | return -1; | |
5300 | } | |
5301 | ||
b34cbebf | 5302 | static |
c4b88406 MD |
5303 | int ust_app_flush_app_session(struct ust_app *app, |
5304 | struct ust_app_session *ua_sess) | |
b34cbebf | 5305 | { |
c4b88406 | 5306 | int ret, retval = 0; |
b34cbebf | 5307 | struct lttng_ht_iter iter; |
b34cbebf | 5308 | struct ust_app_channel *ua_chan; |
c4b88406 | 5309 | struct consumer_socket *socket; |
b34cbebf | 5310 | |
c4b88406 | 5311 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
5312 | |
5313 | rcu_read_lock(); | |
5314 | ||
5315 | if (!app->compatible) { | |
c4b88406 | 5316 | goto end_not_compatible; |
b34cbebf MD |
5317 | } |
5318 | ||
5319 | pthread_mutex_lock(&ua_sess->lock); | |
5320 | ||
b161602a MD |
5321 | if (ua_sess->deleted) { |
5322 | goto end_deleted; | |
5323 | } | |
5324 | ||
b34cbebf MD |
5325 | health_code_update(); |
5326 | ||
9d6c7d3f | 5327 | /* Flushing buffers */ |
c4b88406 MD |
5328 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
5329 | ua_sess->consumer); | |
ce34fcd0 MD |
5330 | |
5331 | /* Flush buffers and push metadata. */ | |
5332 | switch (ua_sess->buffer_type) { | |
5333 | case LTTNG_BUFFER_PER_PID: | |
5334 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
5335 | node.node) { | |
5336 | health_code_update(); | |
ce34fcd0 MD |
5337 | ret = consumer_flush_channel(socket, ua_chan->key); |
5338 | if (ret) { | |
5339 | ERR("Error flushing consumer channel"); | |
5340 | retval = -1; | |
5341 | continue; | |
5342 | } | |
8be98f9a | 5343 | } |
ce34fcd0 MD |
5344 | break; |
5345 | case LTTNG_BUFFER_PER_UID: | |
5346 | default: | |
a0377dfe | 5347 | abort(); |
ce34fcd0 | 5348 | break; |
8be98f9a | 5349 | } |
8be98f9a | 5350 | |
840cb59c | 5351 | health_code_update(); |
86acf0da | 5352 | |
b161602a | 5353 | end_deleted: |
d88aee68 | 5354 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 5355 | |
c4b88406 MD |
5356 | end_not_compatible: |
5357 | rcu_read_unlock(); | |
5358 | health_code_update(); | |
5359 | return retval; | |
5360 | } | |
5361 | ||
5362 | /* | |
ce34fcd0 MD |
5363 | * Flush buffers for all applications for a specific UST session. |
5364 | * Called with UST session lock held. | |
c4b88406 MD |
5365 | */ |
5366 | static | |
ce34fcd0 | 5367 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
5368 | |
5369 | { | |
99b1411c | 5370 | int ret = 0; |
c4b88406 | 5371 | |
ce34fcd0 | 5372 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
5373 | |
5374 | rcu_read_lock(); | |
5375 | ||
ce34fcd0 MD |
5376 | /* Flush buffers and push metadata. */ |
5377 | switch (usess->buffer_type) { | |
5378 | case LTTNG_BUFFER_PER_UID: | |
5379 | { | |
5380 | struct buffer_reg_uid *reg; | |
5381 | struct lttng_ht_iter iter; | |
5382 | ||
5383 | /* Flush all per UID buffers associated to that session. */ | |
5384 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5385 | struct ust_registry_session *ust_session_reg; | |
3273699d | 5386 | struct buffer_reg_channel *buf_reg_chan; |
ce34fcd0 MD |
5387 | struct consumer_socket *socket; |
5388 | ||
5389 | /* Get consumer socket to use to push the metadata.*/ | |
5390 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5391 | usess->consumer); | |
5392 | if (!socket) { | |
5393 | /* Ignore request if no consumer is found for the session. */ | |
5394 | continue; | |
5395 | } | |
5396 | ||
5397 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3273699d | 5398 | buf_reg_chan, node.node) { |
ce34fcd0 MD |
5399 | /* |
5400 | * The following call will print error values so the return | |
5401 | * code is of little importance because whatever happens, we | |
5402 | * have to try them all. | |
5403 | */ | |
3273699d | 5404 | (void) consumer_flush_channel(socket, buf_reg_chan->consumer_key); |
ce34fcd0 MD |
5405 | } |
5406 | ||
5407 | ust_session_reg = reg->registry->reg.ust; | |
5408 | /* Push metadata. */ | |
5409 | (void) push_metadata(ust_session_reg, usess->consumer); | |
5410 | } | |
ce34fcd0 MD |
5411 | break; |
5412 | } | |
5413 | case LTTNG_BUFFER_PER_PID: | |
5414 | { | |
5415 | struct ust_app_session *ua_sess; | |
5416 | struct lttng_ht_iter iter; | |
5417 | struct ust_app *app; | |
5418 | ||
5419 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5420 | ua_sess = lookup_session_by_app(usess, app); | |
5421 | if (ua_sess == NULL) { | |
5422 | continue; | |
5423 | } | |
5424 | (void) ust_app_flush_app_session(app, ua_sess); | |
5425 | } | |
5426 | break; | |
5427 | } | |
5428 | default: | |
99b1411c | 5429 | ret = -1; |
a0377dfe | 5430 | abort(); |
ce34fcd0 | 5431 | break; |
c4b88406 | 5432 | } |
c4b88406 | 5433 | |
7db205b5 | 5434 | rcu_read_unlock(); |
840cb59c | 5435 | health_code_update(); |
c4b88406 | 5436 | return ret; |
8be98f9a MD |
5437 | } |
5438 | ||
0dd01979 MD |
5439 | static |
5440 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
5441 | struct ust_app_session *ua_sess) | |
5442 | { | |
5443 | int ret = 0; | |
5444 | struct lttng_ht_iter iter; | |
5445 | struct ust_app_channel *ua_chan; | |
5446 | struct consumer_socket *socket; | |
5447 | ||
5448 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
5449 | ||
5450 | rcu_read_lock(); | |
5451 | ||
5452 | if (!app->compatible) { | |
5453 | goto end_not_compatible; | |
5454 | } | |
5455 | ||
5456 | pthread_mutex_lock(&ua_sess->lock); | |
5457 | ||
5458 | if (ua_sess->deleted) { | |
5459 | goto end_unlock; | |
5460 | } | |
5461 | ||
5462 | health_code_update(); | |
5463 | ||
5464 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5465 | ua_sess->consumer); | |
5466 | if (!socket) { | |
5467 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5468 | app->bits_per_long); | |
5469 | ret = -1; | |
5470 | goto end_unlock; | |
5471 | } | |
5472 | ||
5473 | /* Clear quiescent state. */ | |
5474 | switch (ua_sess->buffer_type) { | |
5475 | case LTTNG_BUFFER_PER_PID: | |
5476 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5477 | ua_chan, node.node) { | |
5478 | health_code_update(); | |
5479 | ret = consumer_clear_quiescent_channel(socket, | |
5480 | ua_chan->key); | |
5481 | if (ret) { | |
5482 | ERR("Error clearing quiescent state for consumer channel"); | |
5483 | ret = -1; | |
5484 | continue; | |
5485 | } | |
5486 | } | |
5487 | break; | |
5488 | case LTTNG_BUFFER_PER_UID: | |
5489 | default: | |
a0377dfe | 5490 | abort(); |
0dd01979 MD |
5491 | ret = -1; |
5492 | break; | |
5493 | } | |
5494 | ||
5495 | health_code_update(); | |
5496 | ||
5497 | end_unlock: | |
5498 | pthread_mutex_unlock(&ua_sess->lock); | |
5499 | ||
5500 | end_not_compatible: | |
5501 | rcu_read_unlock(); | |
5502 | health_code_update(); | |
5503 | return ret; | |
5504 | } | |
5505 | ||
5506 | /* | |
5507 | * Clear quiescent state in each stream for all applications for a | |
5508 | * specific UST session. | |
5509 | * Called with UST session lock held. | |
5510 | */ | |
5511 | static | |
5512 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5513 | ||
5514 | { | |
5515 | int ret = 0; | |
5516 | ||
5517 | DBG("Clearing stream quiescent state for all ust apps"); | |
5518 | ||
5519 | rcu_read_lock(); | |
5520 | ||
5521 | switch (usess->buffer_type) { | |
5522 | case LTTNG_BUFFER_PER_UID: | |
5523 | { | |
5524 | struct lttng_ht_iter iter; | |
5525 | struct buffer_reg_uid *reg; | |
5526 | ||
5527 | /* | |
5528 | * Clear quiescent for all per UID buffers associated to | |
5529 | * that session. | |
5530 | */ | |
5531 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5532 | struct consumer_socket *socket; | |
3273699d | 5533 | struct buffer_reg_channel *buf_reg_chan; |
0dd01979 MD |
5534 | |
5535 | /* Get associated consumer socket.*/ | |
5536 | socket = consumer_find_socket_by_bitness( | |
5537 | reg->bits_per_long, usess->consumer); | |
5538 | if (!socket) { | |
5539 | /* | |
5540 | * Ignore request if no consumer is found for | |
5541 | * the session. | |
5542 | */ | |
5543 | continue; | |
5544 | } | |
5545 | ||
5546 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
3273699d | 5547 | &iter.iter, buf_reg_chan, node.node) { |
0dd01979 MD |
5548 | /* |
5549 | * The following call will print error values so | |
5550 | * the return code is of little importance | |
5551 | * because whatever happens, we have to try them | |
5552 | * all. | |
5553 | */ | |
5554 | (void) consumer_clear_quiescent_channel(socket, | |
3273699d | 5555 | buf_reg_chan->consumer_key); |
0dd01979 MD |
5556 | } |
5557 | } | |
5558 | break; | |
5559 | } | |
5560 | case LTTNG_BUFFER_PER_PID: | |
5561 | { | |
5562 | struct ust_app_session *ua_sess; | |
5563 | struct lttng_ht_iter iter; | |
5564 | struct ust_app *app; | |
5565 | ||
5566 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5567 | pid_n.node) { | |
5568 | ua_sess = lookup_session_by_app(usess, app); | |
5569 | if (ua_sess == NULL) { | |
5570 | continue; | |
5571 | } | |
5572 | (void) ust_app_clear_quiescent_app_session(app, | |
5573 | ua_sess); | |
5574 | } | |
5575 | break; | |
5576 | } | |
5577 | default: | |
5578 | ret = -1; | |
a0377dfe | 5579 | abort(); |
0dd01979 MD |
5580 | break; |
5581 | } | |
5582 | ||
5583 | rcu_read_unlock(); | |
5584 | health_code_update(); | |
5585 | return ret; | |
5586 | } | |
5587 | ||
84cd17c6 MD |
5588 | /* |
5589 | * Destroy a specific UST session in apps. | |
5590 | */ | |
3353de95 | 5591 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5592 | { |
ffe60014 | 5593 | int ret; |
84cd17c6 | 5594 | struct ust_app_session *ua_sess; |
bec39940 | 5595 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5596 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5597 | |
852d0037 | 5598 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5599 | |
5600 | rcu_read_lock(); | |
5601 | ||
e0c7ec2b DG |
5602 | if (!app->compatible) { |
5603 | goto end; | |
5604 | } | |
5605 | ||
84cd17c6 | 5606 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5607 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5608 | if (node == NULL) { |
d42f20df DG |
5609 | /* Session is being or is deleted. */ |
5610 | goto end; | |
84cd17c6 MD |
5611 | } |
5612 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5613 | |
840cb59c | 5614 | health_code_update(); |
d0b96690 | 5615 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5616 | |
840cb59c | 5617 | health_code_update(); |
7db205b5 | 5618 | |
84cd17c6 | 5619 | /* Quiescent wait after stopping trace */ |
fb45065e | 5620 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5621 | ret = lttng_ust_ctl_wait_quiescent(app->sock); |
fb45065e | 5622 | pthread_mutex_unlock(&app->sock_lock); |
be355079 JR |
5623 | if (ret < 0) { |
5624 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
9324443a | 5625 | DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d", |
be355079 JR |
5626 | app->pid, app->sock); |
5627 | } else if (ret == -EAGAIN) { | |
9324443a | 5628 | WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d", |
be355079 JR |
5629 | app->pid, app->sock); |
5630 | } else { | |
9324443a | 5631 | ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d", |
be355079 JR |
5632 | ret, app->pid, app->sock); |
5633 | } | |
ffe60014 | 5634 | } |
e0c7ec2b DG |
5635 | end: |
5636 | rcu_read_unlock(); | |
840cb59c | 5637 | health_code_update(); |
84cd17c6 | 5638 | return 0; |
84cd17c6 MD |
5639 | } |
5640 | ||
5b4a0ec0 DG |
5641 | /* |
5642 | * Start tracing for the UST session. | |
5643 | */ | |
421cb601 DG |
5644 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5645 | { | |
bec39940 | 5646 | struct lttng_ht_iter iter; |
421cb601 | 5647 | struct ust_app *app; |
48842b30 | 5648 | |
421cb601 DG |
5649 | DBG("Starting all UST traces"); |
5650 | ||
bb2452c8 MD |
5651 | /* |
5652 | * Even though the start trace might fail, flag this session active so | |
5653 | * other application coming in are started by default. | |
5654 | */ | |
5655 | usess->active = 1; | |
5656 | ||
421cb601 | 5657 | rcu_read_lock(); |
421cb601 | 5658 | |
0dd01979 MD |
5659 | /* |
5660 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5661 | * of each channel set by the prior stop command, thus ensuring that a | |
5662 | * following stop or destroy is sure to grab a timestamp_end near those | |
5663 | * operations, even if the packet is empty. | |
5664 | */ | |
5665 | (void) ust_app_clear_quiescent_session(usess); | |
5666 | ||
0498a00c MD |
5667 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5668 | ust_app_global_update(usess, app); | |
5669 | } | |
5670 | ||
48842b30 DG |
5671 | rcu_read_unlock(); |
5672 | ||
5673 | return 0; | |
5674 | } | |
487cf67c | 5675 | |
8be98f9a MD |
5676 | /* |
5677 | * Start tracing for the UST session. | |
ce34fcd0 | 5678 | * Called with UST session lock held. |
8be98f9a MD |
5679 | */ |
5680 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5681 | { | |
5682 | int ret = 0; | |
bec39940 | 5683 | struct lttng_ht_iter iter; |
8be98f9a MD |
5684 | struct ust_app *app; |
5685 | ||
5686 | DBG("Stopping all UST traces"); | |
5687 | ||
bb2452c8 MD |
5688 | /* |
5689 | * Even though the stop trace might fail, flag this session inactive so | |
5690 | * other application coming in are not started by default. | |
5691 | */ | |
5692 | usess->active = 0; | |
5693 | ||
8be98f9a MD |
5694 | rcu_read_lock(); |
5695 | ||
b34cbebf MD |
5696 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5697 | ret = ust_app_stop_trace(usess, app); | |
5698 | if (ret < 0) { | |
5699 | /* Continue to next apps even on error */ | |
5700 | continue; | |
5701 | } | |
5702 | } | |
5703 | ||
ce34fcd0 | 5704 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5705 | |
5706 | rcu_read_unlock(); | |
5707 | ||
5708 | return 0; | |
5709 | } | |
5710 | ||
84cd17c6 MD |
5711 | /* |
5712 | * Destroy app UST session. | |
5713 | */ | |
5714 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5715 | { | |
5716 | int ret = 0; | |
bec39940 | 5717 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5718 | struct ust_app *app; |
5719 | ||
5720 | DBG("Destroy all UST traces"); | |
5721 | ||
5722 | rcu_read_lock(); | |
5723 | ||
852d0037 | 5724 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5725 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5726 | if (ret < 0) { |
5727 | /* Continue to next apps even on error */ | |
5728 | continue; | |
5729 | } | |
5730 | } | |
5731 | ||
5732 | rcu_read_unlock(); | |
5733 | ||
5734 | return 0; | |
5735 | } | |
5736 | ||
88e3c2f5 | 5737 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5738 | static |
88e3c2f5 JG |
5739 | int find_or_create_ust_app_channel( |
5740 | struct ltt_ust_session *usess, | |
5741 | struct ust_app_session *ua_sess, | |
5742 | struct ust_app *app, | |
5743 | struct ltt_ust_channel *uchan, | |
5744 | struct ust_app_channel **ua_chan) | |
487cf67c | 5745 | { |
55c54cce | 5746 | int ret = 0; |
88e3c2f5 JG |
5747 | struct lttng_ht_iter iter; |
5748 | struct lttng_ht_node_str *ua_chan_node; | |
5749 | ||
5750 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5751 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5752 | if (ua_chan_node) { | |
5753 | *ua_chan = caa_container_of(ua_chan_node, | |
5754 | struct ust_app_channel, node); | |
5755 | goto end; | |
5756 | } | |
5757 | ||
5758 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5759 | if (ret) { | |
5760 | goto end; | |
5761 | } | |
5762 | end: | |
5763 | return ret; | |
5764 | } | |
5765 | ||
5766 | static | |
5767 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5768 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5769 | struct ust_app *app) | |
5770 | { | |
5771 | int ret = 0; | |
5772 | struct ust_app_event *ua_event = NULL; | |
5773 | ||
5774 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5775 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5776 | if (!ua_event) { | |
5777 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5778 | if (ret < 0) { | |
5779 | goto end; | |
5780 | } | |
5781 | } else { | |
5782 | if (ua_event->enabled != uevent->enabled) { | |
5783 | ret = uevent->enabled ? | |
5784 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5785 | disable_ust_app_event(ua_sess, ua_event, app); | |
5786 | } | |
5787 | } | |
5788 | ||
5789 | end: | |
5790 | return ret; | |
5791 | } | |
5792 | ||
993578ff JR |
5793 | /* Called with RCU read-side lock held. */ |
5794 | static | |
5795 | void ust_app_synchronize_event_notifier_rules(struct ust_app *app) | |
5796 | { | |
5797 | int ret = 0; | |
5798 | enum lttng_error_code ret_code; | |
5799 | enum lttng_trigger_status t_status; | |
5800 | struct lttng_ht_iter app_trigger_iter; | |
5801 | struct lttng_triggers *triggers = NULL; | |
5802 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5803 | unsigned int count, i; | |
5804 | ||
783db316 MD |
5805 | if (!ust_app_supports_notifiers(app)) { |
5806 | goto end; | |
5807 | } | |
5808 | ||
993578ff JR |
5809 | /* |
5810 | * Currrently, registering or unregistering a trigger with an | |
5811 | * event rule condition causes a full synchronization of the event | |
5812 | * notifiers. | |
5813 | * | |
5814 | * The first step attempts to add an event notifier for all registered | |
5815 | * triggers that apply to the user space tracers. Then, the | |
5816 | * application's event notifiers rules are all checked against the list | |
5817 | * of registered triggers. Any event notifier that doesn't have a | |
5818 | * matching trigger can be assumed to have been disabled. | |
5819 | * | |
5820 | * All of this is inefficient, but is put in place to get the feature | |
5821 | * rolling as it is simpler at this moment. It will be optimized Soon™ | |
5822 | * to allow the state of enabled | |
5823 | * event notifiers to be synchronized in a piece-wise way. | |
5824 | */ | |
5825 | ||
5826 | /* Get all triggers using uid 0 (root) */ | |
5827 | ret_code = notification_thread_command_list_triggers( | |
412d7227 | 5828 | the_notification_thread_handle, 0, &triggers); |
993578ff | 5829 | if (ret_code != LTTNG_OK) { |
993578ff JR |
5830 | goto end; |
5831 | } | |
5832 | ||
a0377dfe | 5833 | LTTNG_ASSERT(triggers); |
993578ff JR |
5834 | |
5835 | t_status = lttng_triggers_get_count(triggers, &count); | |
5836 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
993578ff JR |
5837 | goto end; |
5838 | } | |
5839 | ||
5840 | for (i = 0; i < count; i++) { | |
5841 | struct lttng_condition *condition; | |
5842 | struct lttng_event_rule *event_rule; | |
5843 | struct lttng_trigger *trigger; | |
5844 | const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule; | |
5845 | enum lttng_condition_status condition_status; | |
5846 | uint64_t token; | |
5847 | ||
5848 | trigger = lttng_triggers_borrow_mutable_at_index(triggers, i); | |
a0377dfe | 5849 | LTTNG_ASSERT(trigger); |
993578ff JR |
5850 | |
5851 | token = lttng_trigger_get_tracer_token(trigger); | |
5852 | condition = lttng_trigger_get_condition(trigger); | |
5853 | ||
8dbb86b8 JR |
5854 | if (lttng_condition_get_type(condition) != |
5855 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES) { | |
993578ff JR |
5856 | /* Does not apply */ |
5857 | continue; | |
5858 | } | |
5859 | ||
8dbb86b8 JR |
5860 | condition_status = |
5861 | lttng_condition_event_rule_matches_borrow_rule_mutable( | |
5862 | condition, &event_rule); | |
a0377dfe | 5863 | LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); |
993578ff JR |
5864 | |
5865 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5866 | /* Skip kernel related triggers. */ | |
5867 | continue; | |
5868 | } | |
5869 | ||
5870 | /* | |
5871 | * Find or create the associated token event rule. The caller | |
5872 | * holds the RCU read lock, so this is safe to call without | |
5873 | * explicitly acquiring it here. | |
5874 | */ | |
5875 | looked_up_event_notifier_rule = find_ust_app_event_notifier_rule( | |
5876 | app->token_to_event_notifier_rule_ht, token); | |
5877 | if (!looked_up_event_notifier_rule) { | |
267d66aa | 5878 | ret = create_ust_app_event_notifier_rule(trigger, app); |
993578ff JR |
5879 | if (ret < 0) { |
5880 | goto end; | |
5881 | } | |
5882 | } | |
5883 | } | |
5884 | ||
5885 | rcu_read_lock(); | |
5886 | /* Remove all unknown event sources from the app. */ | |
5887 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
5888 | &app_trigger_iter.iter, event_notifier_rule, | |
5889 | node.node) { | |
5890 | const uint64_t app_token = event_notifier_rule->token; | |
5891 | bool found = false; | |
5892 | ||
5893 | /* | |
5894 | * Check if the app event trigger still exists on the | |
5895 | * notification side. | |
5896 | */ | |
5897 | for (i = 0; i < count; i++) { | |
5898 | uint64_t notification_thread_token; | |
5899 | const struct lttng_trigger *trigger = | |
5900 | lttng_triggers_get_at_index( | |
5901 | triggers, i); | |
5902 | ||
a0377dfe | 5903 | LTTNG_ASSERT(trigger); |
993578ff JR |
5904 | |
5905 | notification_thread_token = | |
5906 | lttng_trigger_get_tracer_token(trigger); | |
5907 | ||
5908 | if (notification_thread_token == app_token) { | |
5909 | found = true; | |
5910 | break; | |
5911 | } | |
5912 | } | |
5913 | ||
5914 | if (found) { | |
5915 | /* Still valid. */ | |
5916 | continue; | |
5917 | } | |
5918 | ||
5919 | /* | |
5920 | * This trigger was unregistered, disable it on the tracer's | |
5921 | * side. | |
5922 | */ | |
5923 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, | |
5924 | &app_trigger_iter); | |
a0377dfe | 5925 | LTTNG_ASSERT(ret == 0); |
993578ff JR |
5926 | |
5927 | /* Callee logs errors. */ | |
5928 | (void) disable_ust_object(app, event_notifier_rule->obj); | |
5929 | ||
5930 | delete_ust_app_event_notifier_rule( | |
5931 | app->sock, event_notifier_rule, app); | |
5932 | } | |
5933 | ||
5934 | rcu_read_unlock(); | |
5935 | ||
5936 | end: | |
5937 | lttng_triggers_destroy(triggers); | |
5938 | return; | |
5939 | } | |
5940 | ||
88e3c2f5 | 5941 | /* |
a84d1024 | 5942 | * RCU read lock must be held by the caller. |
88e3c2f5 JG |
5943 | */ |
5944 | static | |
a84d1024 FD |
5945 | void ust_app_synchronize_all_channels(struct ltt_ust_session *usess, |
5946 | struct ust_app_session *ua_sess, | |
88e3c2f5 JG |
5947 | struct ust_app *app) |
5948 | { | |
5949 | int ret = 0; | |
5950 | struct cds_lfht_iter uchan_iter; | |
5951 | struct ltt_ust_channel *uchan; | |
1f3580c7 | 5952 | |
a0377dfe FD |
5953 | LTTNG_ASSERT(usess); |
5954 | LTTNG_ASSERT(ua_sess); | |
5955 | LTTNG_ASSERT(app); | |
ef67c072 | 5956 | |
88e3c2f5 JG |
5957 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, |
5958 | uchan, node.node) { | |
5959 | struct ust_app_channel *ua_chan; | |
5960 | struct cds_lfht_iter uevent_iter; | |
5961 | struct ltt_ust_event *uevent; | |
487cf67c | 5962 | |
31746f93 | 5963 | /* |
88e3c2f5 JG |
5964 | * Search for a matching ust_app_channel. If none is found, |
5965 | * create it. Creating the channel will cause the ua_chan | |
5966 | * structure to be allocated, the channel buffers to be | |
5967 | * allocated (if necessary) and sent to the application, and | |
5968 | * all enabled contexts will be added to the channel. | |
31746f93 | 5969 | */ |
f3db82be | 5970 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
88e3c2f5 JG |
5971 | app, uchan, &ua_chan); |
5972 | if (ret) { | |
5973 | /* Tracer is probably gone or ENOMEM. */ | |
a84d1024 | 5974 | goto end; |
727d5404 DG |
5975 | } |
5976 | ||
88e3c2f5 JG |
5977 | if (!ua_chan) { |
5978 | /* ua_chan will be NULL for the metadata channel */ | |
5979 | continue; | |
5980 | } | |
727d5404 | 5981 | |
88e3c2f5 | 5982 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5983 | node.node) { |
88e3c2f5 JG |
5984 | ret = ust_app_channel_synchronize_event(ua_chan, |
5985 | uevent, ua_sess, app); | |
5986 | if (ret) { | |
a84d1024 | 5987 | goto end; |
487cf67c | 5988 | } |
36dc12cc | 5989 | } |
d0b96690 | 5990 | |
88e3c2f5 JG |
5991 | if (ua_chan->enabled != uchan->enabled) { |
5992 | ret = uchan->enabled ? | |
5993 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5994 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5995 | if (ret) { | |
a84d1024 | 5996 | goto end; |
88e3c2f5 JG |
5997 | } |
5998 | } | |
36dc12cc | 5999 | } |
a84d1024 FD |
6000 | end: |
6001 | return; | |
6002 | } | |
6003 | ||
6004 | /* | |
6005 | * The caller must ensure that the application is compatible and is tracked | |
6006 | * by the process attribute trackers. | |
6007 | */ | |
6008 | static | |
6009 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
6010 | struct ust_app *app) | |
6011 | { | |
6012 | int ret = 0; | |
6013 | struct ust_app_session *ua_sess = NULL; | |
6014 | ||
6015 | /* | |
6016 | * The application's configuration should only be synchronized for | |
6017 | * active sessions. | |
6018 | */ | |
a0377dfe | 6019 | LTTNG_ASSERT(usess->active); |
a84d1024 FD |
6020 | |
6021 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
6022 | if (ret < 0) { | |
6023 | /* Tracer is probably gone or ENOMEM. */ | |
50f71cad FD |
6024 | if (ua_sess) { |
6025 | destroy_app_session(app, ua_sess); | |
6026 | } | |
6027 | goto end; | |
a84d1024 | 6028 | } |
a0377dfe | 6029 | LTTNG_ASSERT(ua_sess); |
a84d1024 FD |
6030 | |
6031 | pthread_mutex_lock(&ua_sess->lock); | |
6032 | if (ua_sess->deleted) { | |
50f71cad | 6033 | goto deleted_session; |
a84d1024 FD |
6034 | } |
6035 | ||
6036 | rcu_read_lock(); | |
6037 | ||
6038 | ust_app_synchronize_all_channels(usess, ua_sess, app); | |
ef67c072 JG |
6039 | |
6040 | /* | |
6041 | * Create the metadata for the application. This returns gracefully if a | |
6042 | * metadata was already set for the session. | |
6043 | * | |
6044 | * The metadata channel must be created after the data channels as the | |
6045 | * consumer daemon assumes this ordering. When interacting with a relay | |
6046 | * daemon, the consumer will use this assumption to send the | |
6047 | * "STREAMS_SENT" message to the relay daemon. | |
6048 | */ | |
6049 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
6050 | if (ret < 0) { | |
50f71cad FD |
6051 | ERR("Metadata creation failed for app sock %d for session id %" PRIu64, |
6052 | app->sock, usess->id); | |
ef67c072 JG |
6053 | } |
6054 | ||
88e3c2f5 | 6055 | rcu_read_unlock(); |
0498a00c | 6056 | |
50f71cad | 6057 | deleted_session: |
d0b96690 | 6058 | pthread_mutex_unlock(&ua_sess->lock); |
50f71cad | 6059 | end: |
487cf67c DG |
6060 | return; |
6061 | } | |
55cc08a6 | 6062 | |
a9ad0c8f MD |
6063 | static |
6064 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
6065 | { | |
6066 | struct ust_app_session *ua_sess; | |
6067 | ||
6068 | ua_sess = lookup_session_by_app(usess, app); | |
6069 | if (ua_sess == NULL) { | |
6070 | return; | |
6071 | } | |
6072 | destroy_app_session(app, ua_sess); | |
6073 | } | |
6074 | ||
6075 | /* | |
6076 | * Add channels/events from UST global domain to registered apps at sock. | |
6077 | * | |
6078 | * Called with session lock held. | |
6079 | * Called with RCU read-side lock held. | |
6080 | */ | |
6081 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
6082 | { | |
a0377dfe FD |
6083 | LTTNG_ASSERT(usess); |
6084 | LTTNG_ASSERT(usess->active); | |
a9ad0c8f MD |
6085 | |
6086 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
6087 | app->sock, usess->id); | |
6088 | ||
6089 | if (!app->compatible) { | |
6090 | return; | |
6091 | } | |
159b042f JG |
6092 | if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, |
6093 | usess, app->pid) && | |
55c9e7ca | 6094 | trace_ust_id_tracker_lookup( |
159b042f JG |
6095 | LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, |
6096 | usess, app->uid) && | |
55c9e7ca | 6097 | trace_ust_id_tracker_lookup( |
159b042f JG |
6098 | LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, |
6099 | usess, app->gid)) { | |
88e3c2f5 JG |
6100 | /* |
6101 | * Synchronize the application's internal tracing configuration | |
6102 | * and start tracing. | |
6103 | */ | |
6104 | ust_app_synchronize(usess, app); | |
6105 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
6106 | } else { |
6107 | ust_app_global_destroy(usess, app); | |
6108 | } | |
6109 | } | |
6110 | ||
993578ff JR |
6111 | /* |
6112 | * Add all event notifiers to an application. | |
6113 | * | |
6114 | * Called with session lock held. | |
6115 | * Called with RCU read-side lock held. | |
6116 | */ | |
6117 | void ust_app_global_update_event_notifier_rules(struct ust_app *app) | |
6118 | { | |
9324443a | 6119 | DBG2("UST application global event notifier rules update: app = '%s', pid = %d", |
be355079 | 6120 | app->name, app->pid); |
993578ff | 6121 | |
783db316 | 6122 | if (!app->compatible || !ust_app_supports_notifiers(app)) { |
993578ff JR |
6123 | return; |
6124 | } | |
6125 | ||
6126 | if (app->event_notifier_group.object == NULL) { | |
9324443a | 6127 | WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s', pid = %d", |
be355079 | 6128 | app->name, app->pid); |
993578ff JR |
6129 | return; |
6130 | } | |
6131 | ||
6132 | ust_app_synchronize_event_notifier_rules(app); | |
6133 | } | |
6134 | ||
a9ad0c8f MD |
6135 | /* |
6136 | * Called with session lock held. | |
6137 | */ | |
6138 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
6139 | { | |
6140 | struct lttng_ht_iter iter; | |
6141 | struct ust_app *app; | |
6142 | ||
6143 | rcu_read_lock(); | |
6144 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6145 | ust_app_global_update(usess, app); | |
6146 | } | |
6147 | rcu_read_unlock(); | |
6148 | } | |
6149 | ||
993578ff JR |
6150 | void ust_app_global_update_all_event_notifier_rules(void) |
6151 | { | |
6152 | struct lttng_ht_iter iter; | |
6153 | struct ust_app *app; | |
6154 | ||
6155 | rcu_read_lock(); | |
6156 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6157 | ust_app_global_update_event_notifier_rules(app); | |
6158 | } | |
6159 | ||
6160 | rcu_read_unlock(); | |
6161 | } | |
6162 | ||
55cc08a6 DG |
6163 | /* |
6164 | * Add context to a specific channel for global UST domain. | |
6165 | */ | |
6166 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
6167 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
6168 | { | |
6169 | int ret = 0; | |
bec39940 DG |
6170 | struct lttng_ht_node_str *ua_chan_node; |
6171 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
6172 | struct ust_app_channel *ua_chan = NULL; |
6173 | struct ust_app_session *ua_sess; | |
6174 | struct ust_app *app; | |
6175 | ||
a0377dfe | 6176 | LTTNG_ASSERT(usess->active); |
0498a00c | 6177 | |
55cc08a6 | 6178 | rcu_read_lock(); |
852d0037 | 6179 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
6180 | if (!app->compatible) { |
6181 | /* | |
6182 | * TODO: In time, we should notice the caller of this error by | |
6183 | * telling him that this is a version error. | |
6184 | */ | |
6185 | continue; | |
6186 | } | |
55cc08a6 DG |
6187 | ua_sess = lookup_session_by_app(usess, app); |
6188 | if (ua_sess == NULL) { | |
6189 | continue; | |
6190 | } | |
6191 | ||
d0b96690 | 6192 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
6193 | |
6194 | if (ua_sess->deleted) { | |
6195 | pthread_mutex_unlock(&ua_sess->lock); | |
6196 | continue; | |
6197 | } | |
6198 | ||
55cc08a6 | 6199 | /* Lookup channel in the ust app session */ |
bec39940 DG |
6200 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
6201 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 6202 | if (ua_chan_node == NULL) { |
d0b96690 | 6203 | goto next_app; |
55cc08a6 DG |
6204 | } |
6205 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
6206 | node); | |
c9edf082 | 6207 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 6208 | if (ret < 0) { |
d0b96690 | 6209 | goto next_app; |
55cc08a6 | 6210 | } |
d0b96690 DG |
6211 | next_app: |
6212 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
6213 | } |
6214 | ||
55cc08a6 | 6215 | rcu_read_unlock(); |
76d45b40 DG |
6216 | return ret; |
6217 | } | |
7f79d3a1 | 6218 | |
d0b96690 DG |
6219 | /* |
6220 | * Receive registration and populate the given msg structure. | |
6221 | * | |
6222 | * On success return 0 else a negative value returned by the ustctl call. | |
6223 | */ | |
6224 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
6225 | { | |
6226 | int ret; | |
6227 | uint32_t pid, ppid, uid, gid; | |
6228 | ||
a0377dfe | 6229 | LTTNG_ASSERT(msg); |
d0b96690 | 6230 | |
b623cb6a | 6231 | ret = lttng_ust_ctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, |
d0b96690 DG |
6232 | &pid, &ppid, &uid, &gid, |
6233 | &msg->bits_per_long, | |
6234 | &msg->uint8_t_alignment, | |
6235 | &msg->uint16_t_alignment, | |
6236 | &msg->uint32_t_alignment, | |
6237 | &msg->uint64_t_alignment, | |
6238 | &msg->long_alignment, | |
6239 | &msg->byte_order, | |
6240 | msg->name); | |
6241 | if (ret < 0) { | |
6242 | switch (-ret) { | |
6243 | case EPIPE: | |
6244 | case ECONNRESET: | |
6245 | case LTTNG_UST_ERR_EXITING: | |
6246 | DBG3("UST app recv reg message failed. Application died"); | |
6247 | break; | |
6248 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
6249 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
6250 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
6251 | LTTNG_UST_ABI_MINOR_VERSION); | |
6252 | break; | |
6253 | default: | |
6254 | ERR("UST app recv reg message failed with ret %d", ret); | |
6255 | break; | |
6256 | } | |
6257 | goto error; | |
6258 | } | |
6259 | msg->pid = (pid_t) pid; | |
6260 | msg->ppid = (pid_t) ppid; | |
6261 | msg->uid = (uid_t) uid; | |
6262 | msg->gid = (gid_t) gid; | |
6263 | ||
6264 | error: | |
6265 | return ret; | |
6266 | } | |
6267 | ||
10b56aef MD |
6268 | /* |
6269 | * Return a ust app session object using the application object and the | |
6270 | * session object descriptor has a key. If not found, NULL is returned. | |
6271 | * A RCU read side lock MUST be acquired when calling this function. | |
6272 | */ | |
6273 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
6274 | int objd) | |
6275 | { | |
6276 | struct lttng_ht_node_ulong *node; | |
6277 | struct lttng_ht_iter iter; | |
6278 | struct ust_app_session *ua_sess = NULL; | |
6279 | ||
a0377dfe | 6280 | LTTNG_ASSERT(app); |
10b56aef MD |
6281 | |
6282 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
6283 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6284 | if (node == NULL) { | |
6285 | DBG2("UST app session find by objd %d not found", objd); | |
6286 | goto error; | |
6287 | } | |
6288 | ||
6289 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
6290 | ||
6291 | error: | |
6292 | return ua_sess; | |
6293 | } | |
6294 | ||
d88aee68 DG |
6295 | /* |
6296 | * Return a ust app channel object using the application object and the channel | |
6297 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
6298 | * lock MUST be acquired before calling this function. | |
6299 | */ | |
d0b96690 DG |
6300 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
6301 | int objd) | |
6302 | { | |
6303 | struct lttng_ht_node_ulong *node; | |
6304 | struct lttng_ht_iter iter; | |
6305 | struct ust_app_channel *ua_chan = NULL; | |
6306 | ||
a0377dfe | 6307 | LTTNG_ASSERT(app); |
d0b96690 DG |
6308 | |
6309 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
6310 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6311 | if (node == NULL) { | |
6312 | DBG2("UST app channel find by objd %d not found", objd); | |
6313 | goto error; | |
6314 | } | |
6315 | ||
6316 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
6317 | ||
6318 | error: | |
6319 | return ua_chan; | |
6320 | } | |
6321 | ||
c559ee63 MD |
6322 | /* |
6323 | * Fixup legacy context fields for comparison: | |
6324 | * - legacy array becomes array_nestable, | |
6325 | * - legacy struct becomes struct_nestable, | |
6326 | * - legacy variant becomes variant_nestable, | |
6327 | * legacy sequences are not emitted in LTTng-UST contexts. | |
6328 | */ | |
6329 | static int ust_app_fixup_legacy_context_fields(size_t *_nr_fields, | |
6330 | struct lttng_ust_ctl_field **_fields) | |
6331 | { | |
6332 | struct lttng_ust_ctl_field *fields = *_fields, *new_fields = NULL; | |
6333 | size_t nr_fields = *_nr_fields, new_nr_fields = 0, i, j; | |
6334 | bool found = false; | |
6335 | int ret = 0; | |
6336 | ||
6337 | for (i = 0; i < nr_fields; i++) { | |
6338 | const struct lttng_ust_ctl_field *field = &fields[i]; | |
6339 | ||
6340 | switch (field->type.atype) { | |
6341 | case lttng_ust_ctl_atype_sequence: | |
6342 | ERR("Unexpected legacy sequence context."); | |
6343 | ret = -EINVAL; | |
6344 | goto end; | |
6345 | case lttng_ust_ctl_atype_array: | |
6346 | switch (field->type.u.legacy.array.elem_type.atype) { | |
6347 | case lttng_ust_ctl_atype_integer: | |
6348 | break; | |
6349 | default: | |
6350 | ERR("Unexpected legacy array element type in context."); | |
6351 | ret = -EINVAL; | |
6352 | goto end; | |
6353 | } | |
6354 | found = true; | |
6355 | /* One field for array_nested, one field for elem type. */ | |
6356 | new_nr_fields += 2; | |
6357 | break; | |
6358 | ||
6359 | case lttng_ust_ctl_atype_struct: /* Fallthrough */ | |
6360 | case lttng_ust_ctl_atype_variant: | |
6361 | found = true; | |
6362 | new_nr_fields++; | |
6363 | break; | |
6364 | default: | |
6365 | new_nr_fields++; | |
6366 | break; | |
6367 | } | |
6368 | } | |
6369 | if (!found) { | |
6370 | goto end; | |
6371 | } | |
6372 | new_fields = (struct lttng_ust_ctl_field *) zmalloc(sizeof(*new_fields) * new_nr_fields); | |
6373 | if (!new_fields) { | |
6374 | ret = -ENOMEM; | |
6375 | goto end; | |
6376 | } | |
6377 | for (i = 0, j = 0; i < nr_fields; i++, j++) { | |
6378 | const struct lttng_ust_ctl_field *field = &fields[i]; | |
6379 | struct lttng_ust_ctl_field *new_field = &new_fields[j]; | |
6380 | ||
6381 | switch (field->type.atype) { | |
6382 | case lttng_ust_ctl_atype_array: | |
6383 | /* One field for array_nested, one field for elem type. */ | |
6384 | strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6385 | new_field->type.atype = lttng_ust_ctl_atype_array_nestable; | |
6386 | new_field->type.u.array_nestable.length = field->type.u.legacy.array.length; | |
6387 | new_field->type.u.array_nestable.alignment = 0; | |
6388 | new_field = &new_fields[++j]; /* elem type */ | |
6389 | new_field->type.atype = field->type.u.legacy.array.elem_type.atype; | |
6390 | assert(new_field->type.atype == lttng_ust_ctl_atype_integer); | |
6391 | new_field->type.u.integer = field->type.u.legacy.array.elem_type.u.basic.integer; | |
6392 | break; | |
6393 | case lttng_ust_ctl_atype_struct: | |
6394 | strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6395 | new_field->type.atype = lttng_ust_ctl_atype_struct_nestable; | |
6396 | new_field->type.u.struct_nestable.nr_fields = field->type.u.legacy._struct.nr_fields; | |
6397 | new_field->type.u.struct_nestable.alignment = 0; | |
6398 | break; | |
6399 | case lttng_ust_ctl_atype_variant: | |
6400 | strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6401 | new_field->type.atype = lttng_ust_ctl_atype_variant_nestable; | |
6402 | new_field->type.u.variant_nestable.nr_choices = field->type.u.legacy.variant.nr_choices; | |
6403 | strncpy(new_field->type.u.variant_nestable.tag_name, | |
6404 | field->type.u.legacy.variant.tag_name, | |
6405 | LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6406 | new_field->type.u.variant_nestable.alignment = 0; | |
6407 | break; | |
6408 | default: | |
6409 | *new_field = *field; | |
6410 | break; | |
6411 | } | |
6412 | } | |
6413 | free(fields); | |
6414 | *_fields = new_fields; | |
6415 | *_nr_fields = new_nr_fields; | |
6416 | end: | |
6417 | return ret; | |
6418 | } | |
6419 | ||
d88aee68 DG |
6420 | /* |
6421 | * Reply to a register channel notification from an application on the notify | |
6422 | * socket. The channel metadata is also created. | |
6423 | * | |
6424 | * The session UST registry lock is acquired in this function. | |
6425 | * | |
6426 | * On success 0 is returned else a negative value. | |
6427 | */ | |
8eede835 | 6428 | static int reply_ust_register_channel(int sock, int cobjd, |
b623cb6a | 6429 | size_t nr_fields, struct lttng_ust_ctl_field *fields) |
d0b96690 DG |
6430 | { |
6431 | int ret, ret_code = 0; | |
294e218e | 6432 | uint32_t chan_id; |
7972aab2 | 6433 | uint64_t chan_reg_key; |
c559ee63 | 6434 | enum lttng_ust_ctl_channel_header type = LTTNG_UST_CTL_CHANNEL_HEADER_UNKNOWN; |
d0b96690 DG |
6435 | struct ust_app *app; |
6436 | struct ust_app_channel *ua_chan; | |
6437 | struct ust_app_session *ua_sess; | |
7972aab2 | 6438 | struct ust_registry_session *registry; |
3273699d | 6439 | struct ust_registry_channel *ust_reg_chan; |
d0b96690 DG |
6440 | |
6441 | rcu_read_lock(); | |
6442 | ||
6443 | /* Lookup application. If not found, there is a code flow error. */ | |
6444 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6445 | if (!app) { |
fad1ed2f | 6446 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 | 6447 | sock); |
48c77bf7 | 6448 | ret = -1; |
d88aee68 DG |
6449 | goto error_rcu_unlock; |
6450 | } | |
d0b96690 | 6451 | |
4950b860 | 6452 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6453 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6454 | if (!ua_chan) { |
fad1ed2f | 6455 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6456 | ret = 0; |
6457 | goto error_rcu_unlock; | |
6458 | } | |
6459 | ||
a0377dfe | 6460 | LTTNG_ASSERT(ua_chan->session); |
d0b96690 | 6461 | ua_sess = ua_chan->session; |
d0b96690 | 6462 | |
7972aab2 DG |
6463 | /* Get right session registry depending on the session buffer type. */ |
6464 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6465 | if (!registry) { |
6466 | DBG("Application session is being torn down. Abort event notify"); | |
6467 | ret = 0; | |
6468 | goto error_rcu_unlock; | |
6469 | }; | |
45893984 | 6470 | |
7972aab2 DG |
6471 | /* Depending on the buffer type, a different channel key is used. */ |
6472 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6473 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 6474 | } else { |
7972aab2 | 6475 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
6476 | } |
6477 | ||
7972aab2 DG |
6478 | pthread_mutex_lock(®istry->lock); |
6479 | ||
3273699d | 6480 | ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key); |
a0377dfe | 6481 | LTTNG_ASSERT(ust_reg_chan); |
7972aab2 | 6482 | |
fb277293 MD |
6483 | /* Channel id is set during the object creation. */ |
6484 | chan_id = ust_reg_chan->chan_id; | |
6485 | ||
c559ee63 MD |
6486 | ret = ust_app_fixup_legacy_context_fields(&nr_fields, &fields); |
6487 | if (ret < 0) { | |
6488 | ERR("Registering application channel due to legacy context fields fixup error: pid = %d, sock = %d", | |
6489 | app->pid, app->sock); | |
6490 | ret_code = -EINVAL; | |
6491 | goto reply; | |
6492 | } | |
3273699d | 6493 | if (!ust_reg_chan->register_done) { |
294e218e MD |
6494 | /* |
6495 | * TODO: eventually use the registry event count for | |
6496 | * this channel to better guess header type for per-pid | |
6497 | * buffers. | |
6498 | */ | |
b623cb6a | 6499 | type = LTTNG_UST_CTL_CHANNEL_HEADER_LARGE; |
3273699d FD |
6500 | ust_reg_chan->nr_ctx_fields = nr_fields; |
6501 | ust_reg_chan->ctx_fields = fields; | |
fad1ed2f | 6502 | fields = NULL; |
3273699d | 6503 | ust_reg_chan->header_type = type; |
d0b96690 | 6504 | } else { |
7972aab2 | 6505 | /* Get current already assigned values. */ |
3273699d | 6506 | type = ust_reg_chan->header_type; |
fb277293 MD |
6507 | /* |
6508 | * Validate that the context fields match between | |
6509 | * registry and newcoming application. | |
6510 | */ | |
6511 | if (!match_lttng_ust_ctl_field_array(ust_reg_chan->ctx_fields, | |
6512 | ust_reg_chan->nr_ctx_fields, | |
6513 | fields, nr_fields)) { | |
6514 | ERR("Registering application channel due to context field mismatch: pid = %d, sock = %d", | |
6515 | app->pid, app->sock); | |
6516 | ret_code = -EINVAL; | |
6517 | goto reply; | |
6518 | } | |
d0b96690 | 6519 | } |
d0b96690 DG |
6520 | |
6521 | /* Append to metadata */ | |
3273699d FD |
6522 | if (!ust_reg_chan->metadata_dumped) { |
6523 | ret_code = ust_metadata_channel_statedump(registry, ust_reg_chan); | |
d0b96690 DG |
6524 | if (ret_code) { |
6525 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
6526 | goto reply; | |
6527 | } | |
6528 | } | |
6529 | ||
6530 | reply: | |
7972aab2 | 6531 | DBG3("UST app replying to register channel key %" PRIu64 |
be355079 | 6532 | " with id %u, type = %d, ret = %d", chan_reg_key, chan_id, type, |
7972aab2 | 6533 | ret_code); |
d0b96690 | 6534 | |
b623cb6a | 6535 | ret = lttng_ust_ctl_reply_register_channel(sock, chan_id, type, ret_code); |
d0b96690 | 6536 | if (ret < 0) { |
be355079 JR |
6537 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6538 | DBG3("UST app reply channel failed. Application died: pid = %d, sock = %d", | |
6539 | app->pid, app->sock); | |
6540 | } else if (ret == -EAGAIN) { | |
6541 | WARN("UST app reply channel failed. Communication time out: pid = %d, sock = %d", | |
6542 | app->pid, app->sock); | |
d0b96690 | 6543 | } else { |
be355079 JR |
6544 | ERR("UST app reply channel failed with ret %d: pid = %d, sock = %d", |
6545 | ret, app->pid, app->sock); | |
d0b96690 DG |
6546 | } |
6547 | goto error; | |
6548 | } | |
6549 | ||
7972aab2 | 6550 | /* This channel registry registration is completed. */ |
3273699d | 6551 | ust_reg_chan->register_done = 1; |
7972aab2 | 6552 | |
d0b96690 | 6553 | error: |
7972aab2 | 6554 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6555 | error_rcu_unlock: |
d0b96690 | 6556 | rcu_read_unlock(); |
fad1ed2f | 6557 | free(fields); |
d0b96690 DG |
6558 | return ret; |
6559 | } | |
6560 | ||
d88aee68 DG |
6561 | /* |
6562 | * Add event to the UST channel registry. When the event is added to the | |
6563 | * registry, the metadata is also created. Once done, this replies to the | |
6564 | * application with the appropriate error code. | |
6565 | * | |
6566 | * The session UST registry lock is acquired in the function. | |
6567 | * | |
6568 | * On success 0 is returned else a negative value. | |
6569 | */ | |
d0b96690 | 6570 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
b623cb6a | 6571 | char *sig, size_t nr_fields, struct lttng_ust_ctl_field *fields, |
2106efa0 | 6572 | int loglevel_value, char *model_emf_uri) |
d0b96690 DG |
6573 | { |
6574 | int ret, ret_code; | |
6575 | uint32_t event_id = 0; | |
7972aab2 | 6576 | uint64_t chan_reg_key; |
d0b96690 DG |
6577 | struct ust_app *app; |
6578 | struct ust_app_channel *ua_chan; | |
6579 | struct ust_app_session *ua_sess; | |
7972aab2 | 6580 | struct ust_registry_session *registry; |
d0b96690 DG |
6581 | |
6582 | rcu_read_lock(); | |
6583 | ||
6584 | /* Lookup application. If not found, there is a code flow error. */ | |
6585 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6586 | if (!app) { |
fad1ed2f | 6587 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 | 6588 | sock); |
48c77bf7 | 6589 | ret = -1; |
d88aee68 DG |
6590 | goto error_rcu_unlock; |
6591 | } | |
d0b96690 | 6592 | |
4950b860 | 6593 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6594 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6595 | if (!ua_chan) { |
fad1ed2f | 6596 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6597 | ret = 0; |
6598 | goto error_rcu_unlock; | |
6599 | } | |
6600 | ||
a0377dfe | 6601 | LTTNG_ASSERT(ua_chan->session); |
d0b96690 DG |
6602 | ua_sess = ua_chan->session; |
6603 | ||
7972aab2 | 6604 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
6605 | if (!registry) { |
6606 | DBG("Application session is being torn down. Abort event notify"); | |
6607 | ret = 0; | |
6608 | goto error_rcu_unlock; | |
6609 | } | |
7972aab2 DG |
6610 | |
6611 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6612 | chan_reg_key = ua_chan->tracing_channel_id; | |
6613 | } else { | |
6614 | chan_reg_key = ua_chan->key; | |
6615 | } | |
6616 | ||
6617 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 6618 | |
d5d629b5 DG |
6619 | /* |
6620 | * From this point on, this call acquires the ownership of the sig, fields | |
6621 | * and model_emf_uri meaning any free are done inside it if needed. These | |
6622 | * three variables MUST NOT be read/write after this. | |
6623 | */ | |
7972aab2 | 6624 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
6625 | sobjd, cobjd, name, sig, nr_fields, fields, |
6626 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
6627 | &event_id, app); | |
fad1ed2f JR |
6628 | sig = NULL; |
6629 | fields = NULL; | |
6630 | model_emf_uri = NULL; | |
d0b96690 DG |
6631 | |
6632 | /* | |
6633 | * The return value is returned to ustctl so in case of an error, the | |
6634 | * application can be notified. In case of an error, it's important not to | |
6635 | * return a negative error or else the application will get closed. | |
6636 | */ | |
b623cb6a | 6637 | ret = lttng_ust_ctl_reply_register_event(sock, event_id, ret_code); |
d0b96690 | 6638 | if (ret < 0) { |
be355079 JR |
6639 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6640 | DBG3("UST app reply event failed. Application died: pid = %d, sock = %d.", | |
6641 | app->pid, app->sock); | |
6642 | } else if (ret == -EAGAIN) { | |
6643 | WARN("UST app reply event failed. Communication time out: pid = %d, sock = %d", | |
6644 | app->pid, app->sock); | |
d0b96690 | 6645 | } else { |
be355079 JR |
6646 | ERR("UST app reply event failed with ret %d: pid = %d, sock = %d", |
6647 | ret, app->pid, app->sock); | |
d0b96690 DG |
6648 | } |
6649 | /* | |
6650 | * No need to wipe the create event since the application socket will | |
6651 | * get close on error hence cleaning up everything by itself. | |
6652 | */ | |
6653 | goto error; | |
6654 | } | |
6655 | ||
7972aab2 DG |
6656 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
6657 | name, event_id); | |
d88aee68 | 6658 | |
d0b96690 | 6659 | error: |
7972aab2 | 6660 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6661 | error_rcu_unlock: |
d0b96690 | 6662 | rcu_read_unlock(); |
fad1ed2f JR |
6663 | free(sig); |
6664 | free(fields); | |
6665 | free(model_emf_uri); | |
d0b96690 DG |
6666 | return ret; |
6667 | } | |
6668 | ||
10b56aef MD |
6669 | /* |
6670 | * Add enum to the UST session registry. Once done, this replies to the | |
6671 | * application with the appropriate error code. | |
6672 | * | |
6673 | * The session UST registry lock is acquired within this function. | |
6674 | * | |
6675 | * On success 0 is returned else a negative value. | |
6676 | */ | |
6677 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
b623cb6a | 6678 | struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries) |
10b56aef MD |
6679 | { |
6680 | int ret = 0, ret_code; | |
6681 | struct ust_app *app; | |
6682 | struct ust_app_session *ua_sess; | |
6683 | struct ust_registry_session *registry; | |
6684 | uint64_t enum_id = -1ULL; | |
6685 | ||
6686 | rcu_read_lock(); | |
6687 | ||
6688 | /* Lookup application. If not found, there is a code flow error. */ | |
6689 | app = find_app_by_notify_sock(sock); | |
6690 | if (!app) { | |
6691 | /* Return an error since this is not an error */ | |
6692 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6693 | sock); | |
6694 | free(entries); | |
48c77bf7 | 6695 | ret = -1; |
10b56aef MD |
6696 | goto error_rcu_unlock; |
6697 | } | |
6698 | ||
6699 | /* Lookup session by UST object descriptor. */ | |
6700 | ua_sess = find_session_by_objd(app, sobjd); | |
6701 | if (!ua_sess) { | |
6702 | /* Return an error since this is not an error */ | |
acfb63a8 | 6703 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6704 | free(entries); |
6705 | goto error_rcu_unlock; | |
6706 | } | |
6707 | ||
6708 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6709 | if (!registry) { |
acfb63a8 | 6710 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); |
fad1ed2f JR |
6711 | free(entries); |
6712 | goto error_rcu_unlock; | |
6713 | } | |
10b56aef MD |
6714 | |
6715 | pthread_mutex_lock(®istry->lock); | |
6716 | ||
6717 | /* | |
6718 | * From this point on, the callee acquires the ownership of | |
6719 | * entries. The variable entries MUST NOT be read/written after | |
6720 | * call. | |
6721 | */ | |
6722 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6723 | entries, nr_entries, &enum_id); | |
6724 | entries = NULL; | |
6725 | ||
6726 | /* | |
6727 | * The return value is returned to ustctl so in case of an error, the | |
6728 | * application can be notified. In case of an error, it's important not to | |
6729 | * return a negative error or else the application will get closed. | |
6730 | */ | |
b623cb6a | 6731 | ret = lttng_ust_ctl_reply_register_enum(sock, enum_id, ret_code); |
10b56aef | 6732 | if (ret < 0) { |
be355079 JR |
6733 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6734 | DBG3("UST app reply enum failed. Application died: pid = %d, sock = %d", | |
6735 | app->pid, app->sock); | |
6736 | } else if (ret == -EAGAIN) { | |
6737 | WARN("UST app reply enum failed. Communication time out: pid = %d, sock = %d", | |
6738 | app->pid, app->sock); | |
10b56aef | 6739 | } else { |
be355079 JR |
6740 | ERR("UST app reply enum failed with ret %d: pid = %d, sock = %d", |
6741 | ret, app->pid, app->sock); | |
10b56aef MD |
6742 | } |
6743 | /* | |
6744 | * No need to wipe the create enum since the application socket will | |
6745 | * get close on error hence cleaning up everything by itself. | |
6746 | */ | |
6747 | goto error; | |
6748 | } | |
6749 | ||
6750 | DBG3("UST registry enum %s added successfully or already found", name); | |
6751 | ||
6752 | error: | |
6753 | pthread_mutex_unlock(®istry->lock); | |
6754 | error_rcu_unlock: | |
6755 | rcu_read_unlock(); | |
6756 | return ret; | |
6757 | } | |
6758 | ||
d88aee68 DG |
6759 | /* |
6760 | * Handle application notification through the given notify socket. | |
6761 | * | |
6762 | * Return 0 on success or else a negative value. | |
6763 | */ | |
d0b96690 DG |
6764 | int ust_app_recv_notify(int sock) |
6765 | { | |
6766 | int ret; | |
b623cb6a | 6767 | enum lttng_ust_ctl_notify_cmd cmd; |
d0b96690 DG |
6768 | |
6769 | DBG3("UST app receiving notify from sock %d", sock); | |
6770 | ||
b623cb6a | 6771 | ret = lttng_ust_ctl_recv_notify(sock, &cmd); |
d0b96690 | 6772 | if (ret < 0) { |
be355079 JR |
6773 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6774 | DBG3("UST app recv notify failed. Application died: sock = %d", | |
6775 | sock); | |
6776 | } else if (ret == -EAGAIN) { | |
6777 | WARN("UST app recv notify failed. Communication time out: sock = %d", | |
6778 | sock); | |
d0b96690 | 6779 | } else { |
be355079 JR |
6780 | ERR("UST app recv notify failed with ret %d: sock = %d", |
6781 | ret, sock); | |
d0b96690 DG |
6782 | } |
6783 | goto error; | |
6784 | } | |
6785 | ||
6786 | switch (cmd) { | |
b623cb6a | 6787 | case LTTNG_UST_CTL_NOTIFY_CMD_EVENT: |
d0b96690 | 6788 | { |
2106efa0 | 6789 | int sobjd, cobjd, loglevel_value; |
fc4b93fa | 6790 | char name[LTTNG_UST_ABI_SYM_NAME_LEN], *sig, *model_emf_uri; |
d0b96690 | 6791 | size_t nr_fields; |
b623cb6a | 6792 | struct lttng_ust_ctl_field *fields; |
d0b96690 DG |
6793 | |
6794 | DBG2("UST app ustctl register event received"); | |
6795 | ||
b623cb6a | 6796 | ret = lttng_ust_ctl_recv_register_event(sock, &sobjd, &cobjd, name, |
2106efa0 PP |
6797 | &loglevel_value, &sig, &nr_fields, &fields, |
6798 | &model_emf_uri); | |
d0b96690 | 6799 | if (ret < 0) { |
be355079 JR |
6800 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6801 | DBG3("UST app recv event failed. Application died: sock = %d", | |
6802 | sock); | |
6803 | } else if (ret == -EAGAIN) { | |
6804 | WARN("UST app recv event failed. Communication time out: sock = %d", | |
6805 | sock); | |
d0b96690 | 6806 | } else { |
be355079 JR |
6807 | ERR("UST app recv event failed with ret %d: sock = %d", |
6808 | ret, sock); | |
d0b96690 DG |
6809 | } |
6810 | goto error; | |
6811 | } | |
6812 | ||
d5d629b5 DG |
6813 | /* |
6814 | * Add event to the UST registry coming from the notify socket. This | |
6815 | * call will free if needed the sig, fields and model_emf_uri. This | |
6816 | * code path loses the ownsership of these variables and transfer them | |
6817 | * to the this function. | |
6818 | */ | |
d0b96690 | 6819 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6820 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6821 | if (ret < 0) { |
6822 | goto error; | |
6823 | } | |
6824 | ||
6825 | break; | |
6826 | } | |
b623cb6a | 6827 | case LTTNG_UST_CTL_NOTIFY_CMD_CHANNEL: |
d0b96690 DG |
6828 | { |
6829 | int sobjd, cobjd; | |
6830 | size_t nr_fields; | |
b623cb6a | 6831 | struct lttng_ust_ctl_field *fields; |
d0b96690 DG |
6832 | |
6833 | DBG2("UST app ustctl register channel received"); | |
6834 | ||
b623cb6a | 6835 | ret = lttng_ust_ctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, |
d0b96690 DG |
6836 | &fields); |
6837 | if (ret < 0) { | |
be355079 JR |
6838 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6839 | DBG3("UST app recv channel failed. Application died: sock = %d", | |
6840 | sock); | |
6841 | } else if (ret == -EAGAIN) { | |
6842 | WARN("UST app recv channel failed. Communication time out: sock = %d", | |
6843 | sock); | |
d0b96690 | 6844 | } else { |
9324443a | 6845 | ERR("UST app recv channel failed with ret %d: sock = %d", |
be355079 | 6846 | ret, sock); |
d0b96690 DG |
6847 | } |
6848 | goto error; | |
6849 | } | |
6850 | ||
d5d629b5 DG |
6851 | /* |
6852 | * The fields ownership are transfered to this function call meaning | |
6853 | * that if needed it will be freed. After this, it's invalid to access | |
6854 | * fields or clean it up. | |
6855 | */ | |
8eede835 | 6856 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6857 | fields); |
6858 | if (ret < 0) { | |
6859 | goto error; | |
6860 | } | |
6861 | ||
6862 | break; | |
6863 | } | |
b623cb6a | 6864 | case LTTNG_UST_CTL_NOTIFY_CMD_ENUM: |
10b56aef MD |
6865 | { |
6866 | int sobjd; | |
fc4b93fa | 6867 | char name[LTTNG_UST_ABI_SYM_NAME_LEN]; |
10b56aef | 6868 | size_t nr_entries; |
b623cb6a | 6869 | struct lttng_ust_ctl_enum_entry *entries; |
10b56aef MD |
6870 | |
6871 | DBG2("UST app ustctl register enum received"); | |
6872 | ||
b623cb6a | 6873 | ret = lttng_ust_ctl_recv_register_enum(sock, &sobjd, name, |
10b56aef MD |
6874 | &entries, &nr_entries); |
6875 | if (ret < 0) { | |
be355079 JR |
6876 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6877 | DBG3("UST app recv enum failed. Application died: sock = %d", | |
6878 | sock); | |
6879 | } else if (ret == -EAGAIN) { | |
6880 | WARN("UST app recv enum failed. Communication time out: sock = %d", | |
6881 | sock); | |
10b56aef | 6882 | } else { |
be355079 JR |
6883 | ERR("UST app recv enum failed with ret %d: sock = %d", |
6884 | ret, sock); | |
10b56aef MD |
6885 | } |
6886 | goto error; | |
6887 | } | |
6888 | ||
6889 | /* Callee assumes ownership of entries */ | |
6890 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6891 | entries, nr_entries); | |
6892 | if (ret < 0) { | |
6893 | goto error; | |
6894 | } | |
6895 | ||
6896 | break; | |
6897 | } | |
d0b96690 DG |
6898 | default: |
6899 | /* Should NEVER happen. */ | |
a0377dfe | 6900 | abort(); |
d0b96690 DG |
6901 | } |
6902 | ||
6903 | error: | |
6904 | return ret; | |
6905 | } | |
d88aee68 DG |
6906 | |
6907 | /* | |
6908 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6909 | * corresponding application. On failure, the call_rcu to close the socket is | |
6910 | * executed. If an application is found, it tries to delete it from the notify | |
6911 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6912 | * | |
6913 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6914 | * call RCU is not done but the rest of the cleanup is. | |
6915 | */ | |
6916 | void ust_app_notify_sock_unregister(int sock) | |
6917 | { | |
6918 | int err_enomem = 0; | |
6919 | struct lttng_ht_iter iter; | |
6920 | struct ust_app *app; | |
6921 | struct ust_app_notify_sock_obj *obj; | |
6922 | ||
a0377dfe | 6923 | LTTNG_ASSERT(sock >= 0); |
d88aee68 DG |
6924 | |
6925 | rcu_read_lock(); | |
6926 | ||
7966af57 | 6927 | obj = (ust_app_notify_sock_obj *) zmalloc(sizeof(*obj)); |
d88aee68 DG |
6928 | if (!obj) { |
6929 | /* | |
6930 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6931 | * procedure but the call_rcu will not be called. In this case, we | |
6932 | * accept the fd leak rather than possibly creating an unsynchronized | |
6933 | * state between threads. | |
6934 | * | |
6935 | * TODO: The notify object should be created once the notify socket is | |
6936 | * registered and stored independantely from the ust app object. The | |
6937 | * tricky part is to synchronize the teardown of the application and | |
6938 | * this notify object. Let's keep that in mind so we can avoid this | |
6939 | * kind of shenanigans with ENOMEM in the teardown path. | |
6940 | */ | |
6941 | err_enomem = 1; | |
6942 | } else { | |
6943 | obj->fd = sock; | |
6944 | } | |
6945 | ||
6946 | DBG("UST app notify socket unregister %d", sock); | |
6947 | ||
6948 | /* | |
6949 | * Lookup application by notify socket. If this fails, this means that the | |
6950 | * hash table delete has already been done by the application | |
6951 | * unregistration process so we can safely close the notify socket in a | |
6952 | * call RCU. | |
6953 | */ | |
6954 | app = find_app_by_notify_sock(sock); | |
6955 | if (!app) { | |
6956 | goto close_socket; | |
6957 | } | |
6958 | ||
6959 | iter.iter.node = &app->notify_sock_n.node; | |
6960 | ||
6961 | /* | |
6962 | * Whatever happens here either we fail or succeed, in both cases we have | |
6963 | * to close the socket after a grace period to continue to the call RCU | |
6964 | * here. If the deletion is successful, the application is not visible | |
6965 | * anymore by other threads and is it fails it means that it was already | |
6966 | * deleted from the hash table so either way we just have to close the | |
6967 | * socket. | |
6968 | */ | |
6969 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6970 | ||
6971 | close_socket: | |
6972 | rcu_read_unlock(); | |
6973 | ||
6974 | /* | |
6975 | * Close socket after a grace period to avoid for the socket to be reused | |
6976 | * before the application object is freed creating potential race between | |
6977 | * threads trying to add unique in the global hash table. | |
6978 | */ | |
6979 | if (!err_enomem) { | |
6980 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6981 | } | |
6982 | } | |
f45e313d DG |
6983 | |
6984 | /* | |
6985 | * Destroy a ust app data structure and free its memory. | |
6986 | */ | |
6987 | void ust_app_destroy(struct ust_app *app) | |
6988 | { | |
6989 | if (!app) { | |
6990 | return; | |
6991 | } | |
6992 | ||
6993 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
6994 | } | |
6dc3064a DG |
6995 | |
6996 | /* | |
6997 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
6998 | * output. | |
6999 | * | |
9a654598 | 7000 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 7001 | */ |
fb9a95c4 JG |
7002 | enum lttng_error_code ust_app_snapshot_record( |
7003 | const struct ltt_ust_session *usess, | |
348a81dc | 7004 | const struct consumer_output *output, int wait, |
d07ceecd | 7005 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
7006 | { |
7007 | int ret = 0; | |
9a654598 | 7008 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
7009 | struct lttng_ht_iter iter; |
7010 | struct ust_app *app; | |
affce97e | 7011 | char *trace_path = NULL; |
6dc3064a | 7012 | |
a0377dfe FD |
7013 | LTTNG_ASSERT(usess); |
7014 | LTTNG_ASSERT(output); | |
6dc3064a DG |
7015 | |
7016 | rcu_read_lock(); | |
7017 | ||
8c924c7b MD |
7018 | switch (usess->buffer_type) { |
7019 | case LTTNG_BUFFER_PER_UID: | |
7020 | { | |
7021 | struct buffer_reg_uid *reg; | |
6dc3064a | 7022 | |
8c924c7b | 7023 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
3273699d | 7024 | struct buffer_reg_channel *buf_reg_chan; |
8c924c7b | 7025 | struct consumer_socket *socket; |
3b967712 | 7026 | char pathname[PATH_MAX]; |
5da88b0f | 7027 | size_t consumer_path_offset = 0; |
6dc3064a | 7028 | |
2b269489 JR |
7029 | if (!reg->registry->reg.ust->metadata_key) { |
7030 | /* Skip since no metadata is present */ | |
7031 | continue; | |
7032 | } | |
7033 | ||
8c924c7b MD |
7034 | /* Get consumer socket to use to push the metadata.*/ |
7035 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7036 | usess->consumer); | |
7037 | if (!socket) { | |
9a654598 | 7038 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
7039 | goto error; |
7040 | } | |
6dc3064a | 7041 | |
8c924c7b MD |
7042 | memset(pathname, 0, sizeof(pathname)); |
7043 | ret = snprintf(pathname, sizeof(pathname), | |
bd666153 | 7044 | DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
7045 | reg->uid, reg->bits_per_long); |
7046 | if (ret < 0) { | |
7047 | PERROR("snprintf snapshot path"); | |
9a654598 | 7048 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
7049 | goto error; |
7050 | } | |
affce97e JG |
7051 | /* Free path allowed on previous iteration. */ |
7052 | free(trace_path); | |
5da88b0f MD |
7053 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
7054 | &consumer_path_offset); | |
3b967712 MD |
7055 | if (!trace_path) { |
7056 | status = LTTNG_ERR_INVALID; | |
7057 | goto error; | |
7058 | } | |
f3db82be | 7059 | /* Add the UST default trace dir to path. */ |
8c924c7b | 7060 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
3273699d | 7061 | buf_reg_chan, node.node) { |
9a654598 | 7062 | status = consumer_snapshot_channel(socket, |
3273699d | 7063 | buf_reg_chan->consumer_key, |
e098433c | 7064 | output, 0, usess->uid, |
5da88b0f | 7065 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 7066 | nb_packets_per_stream); |
9a654598 | 7067 | if (status != LTTNG_OK) { |
8c924c7b MD |
7068 | goto error; |
7069 | } | |
7070 | } | |
9a654598 | 7071 | status = consumer_snapshot_channel(socket, |
68808f4e | 7072 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
7073 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
7074 | wait, 0); | |
9a654598 | 7075 | if (status != LTTNG_OK) { |
8c924c7b MD |
7076 | goto error; |
7077 | } | |
af706bb7 | 7078 | } |
8c924c7b MD |
7079 | break; |
7080 | } | |
7081 | case LTTNG_BUFFER_PER_PID: | |
7082 | { | |
7083 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7084 | struct consumer_socket *socket; | |
7085 | struct lttng_ht_iter chan_iter; | |
7086 | struct ust_app_channel *ua_chan; | |
7087 | struct ust_app_session *ua_sess; | |
7088 | struct ust_registry_session *registry; | |
3b967712 | 7089 | char pathname[PATH_MAX]; |
5da88b0f | 7090 | size_t consumer_path_offset = 0; |
8c924c7b MD |
7091 | |
7092 | ua_sess = lookup_session_by_app(usess, app); | |
7093 | if (!ua_sess) { | |
7094 | /* Session not associated with this app. */ | |
7095 | continue; | |
7096 | } | |
af706bb7 | 7097 | |
8c924c7b MD |
7098 | /* Get the right consumer socket for the application. */ |
7099 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 7100 | output); |
8c924c7b | 7101 | if (!socket) { |
9a654598 | 7102 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
7103 | goto error; |
7104 | } | |
7105 | ||
8c924c7b MD |
7106 | /* Add the UST default trace dir to path. */ |
7107 | memset(pathname, 0, sizeof(pathname)); | |
bd666153 | 7108 | ret = snprintf(pathname, sizeof(pathname), "%s", |
8c924c7b | 7109 | ua_sess->path); |
6dc3064a | 7110 | if (ret < 0) { |
9a654598 | 7111 | status = LTTNG_ERR_INVALID; |
8c924c7b | 7112 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
7113 | goto error; |
7114 | } | |
affce97e JG |
7115 | /* Free path allowed on previous iteration. */ |
7116 | free(trace_path); | |
5da88b0f MD |
7117 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
7118 | &consumer_path_offset); | |
3b967712 MD |
7119 | if (!trace_path) { |
7120 | status = LTTNG_ERR_INVALID; | |
7121 | goto error; | |
7122 | } | |
f3db82be | 7123 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 7124 | ua_chan, node.node) { |
9a654598 | 7125 | status = consumer_snapshot_channel(socket, |
470cc211 | 7126 | ua_chan->key, output, 0, |
ff588497 JR |
7127 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7128 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 7129 | &trace_path[consumer_path_offset], wait, |
d2956687 | 7130 | nb_packets_per_stream); |
9a654598 JG |
7131 | switch (status) { |
7132 | case LTTNG_OK: | |
7133 | break; | |
7134 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
7135 | continue; | |
7136 | default: | |
8c924c7b MD |
7137 | goto error; |
7138 | } | |
7139 | } | |
7140 | ||
7141 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 7142 | if (!registry) { |
9bbfb88c MD |
7143 | DBG("Application session is being torn down. Skip application."); |
7144 | continue; | |
fad1ed2f | 7145 | } |
9a654598 | 7146 | status = consumer_snapshot_channel(socket, |
470cc211 | 7147 | registry->metadata_key, output, 1, |
ff588497 JR |
7148 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7149 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 7150 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
7151 | switch (status) { |
7152 | case LTTNG_OK: | |
7153 | break; | |
7154 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
7155 | continue; | |
7156 | default: | |
8c924c7b MD |
7157 | goto error; |
7158 | } | |
7159 | } | |
7160 | break; | |
7161 | } | |
7162 | default: | |
a0377dfe | 7163 | abort(); |
8c924c7b | 7164 | break; |
6dc3064a DG |
7165 | } |
7166 | ||
7167 | error: | |
affce97e | 7168 | free(trace_path); |
6dc3064a | 7169 | rcu_read_unlock(); |
9a654598 | 7170 | return status; |
6dc3064a | 7171 | } |
5c786ded JD |
7172 | |
7173 | /* | |
d07ceecd | 7174 | * Return the size taken by one more packet per stream. |
5c786ded | 7175 | */ |
fb9a95c4 JG |
7176 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
7177 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 7178 | { |
d07ceecd | 7179 | uint64_t tot_size = 0; |
5c786ded JD |
7180 | struct ust_app *app; |
7181 | struct lttng_ht_iter iter; | |
7182 | ||
a0377dfe | 7183 | LTTNG_ASSERT(usess); |
5c786ded JD |
7184 | |
7185 | switch (usess->buffer_type) { | |
7186 | case LTTNG_BUFFER_PER_UID: | |
7187 | { | |
7188 | struct buffer_reg_uid *reg; | |
7189 | ||
7190 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7191 | struct buffer_reg_channel *buf_reg_chan; |
5c786ded | 7192 | |
b7064eaa | 7193 | rcu_read_lock(); |
5c786ded | 7194 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
3273699d FD |
7195 | buf_reg_chan, node.node) { |
7196 | if (cur_nr_packets >= buf_reg_chan->num_subbuf) { | |
d07ceecd MD |
7197 | /* |
7198 | * Don't take channel into account if we | |
7199 | * already grab all its packets. | |
7200 | */ | |
7201 | continue; | |
7202 | } | |
3273699d | 7203 | tot_size += buf_reg_chan->subbuf_size * buf_reg_chan->stream_count; |
5c786ded | 7204 | } |
b7064eaa | 7205 | rcu_read_unlock(); |
5c786ded JD |
7206 | } |
7207 | break; | |
7208 | } | |
7209 | case LTTNG_BUFFER_PER_PID: | |
7210 | { | |
7211 | rcu_read_lock(); | |
7212 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7213 | struct ust_app_channel *ua_chan; | |
7214 | struct ust_app_session *ua_sess; | |
7215 | struct lttng_ht_iter chan_iter; | |
7216 | ||
7217 | ua_sess = lookup_session_by_app(usess, app); | |
7218 | if (!ua_sess) { | |
7219 | /* Session not associated with this app. */ | |
7220 | continue; | |
7221 | } | |
7222 | ||
7223 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7224 | ua_chan, node.node) { | |
d07ceecd MD |
7225 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
7226 | /* | |
7227 | * Don't take channel into account if we | |
7228 | * already grab all its packets. | |
7229 | */ | |
7230 | continue; | |
7231 | } | |
7232 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
7233 | } |
7234 | } | |
7235 | rcu_read_unlock(); | |
7236 | break; | |
7237 | } | |
7238 | default: | |
a0377dfe | 7239 | abort(); |
5c786ded JD |
7240 | break; |
7241 | } | |
7242 | ||
d07ceecd | 7243 | return tot_size; |
5c786ded | 7244 | } |
fb83fe64 JD |
7245 | |
7246 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
7247 | struct cds_list_head *buffer_reg_uid_list, | |
7248 | struct consumer_output *consumer, uint64_t uchan_id, | |
7249 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
7250 | { | |
7251 | int ret; | |
7252 | uint64_t consumer_chan_key; | |
7253 | ||
70dd8162 MD |
7254 | *discarded = 0; |
7255 | *lost = 0; | |
7256 | ||
fb83fe64 | 7257 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 7258 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 7259 | if (ret < 0) { |
70dd8162 MD |
7260 | /* Not found */ |
7261 | ret = 0; | |
fb83fe64 JD |
7262 | goto end; |
7263 | } | |
7264 | ||
7265 | if (overwrite) { | |
7266 | ret = consumer_get_lost_packets(ust_session_id, | |
7267 | consumer_chan_key, consumer, lost); | |
7268 | } else { | |
7269 | ret = consumer_get_discarded_events(ust_session_id, | |
7270 | consumer_chan_key, consumer, discarded); | |
7271 | } | |
7272 | ||
7273 | end: | |
7274 | return ret; | |
7275 | } | |
7276 | ||
7277 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
7278 | struct ltt_ust_channel *uchan, | |
7279 | struct consumer_output *consumer, int overwrite, | |
7280 | uint64_t *discarded, uint64_t *lost) | |
7281 | { | |
7282 | int ret = 0; | |
7283 | struct lttng_ht_iter iter; | |
7284 | struct lttng_ht_node_str *ua_chan_node; | |
7285 | struct ust_app *app; | |
7286 | struct ust_app_session *ua_sess; | |
7287 | struct ust_app_channel *ua_chan; | |
7288 | ||
70dd8162 MD |
7289 | *discarded = 0; |
7290 | *lost = 0; | |
7291 | ||
fb83fe64 JD |
7292 | rcu_read_lock(); |
7293 | /* | |
70dd8162 MD |
7294 | * Iterate over every registered applications. Sum counters for |
7295 | * all applications containing requested session and channel. | |
fb83fe64 JD |
7296 | */ |
7297 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7298 | struct lttng_ht_iter uiter; | |
7299 | ||
7300 | ua_sess = lookup_session_by_app(usess, app); | |
7301 | if (ua_sess == NULL) { | |
7302 | continue; | |
7303 | } | |
7304 | ||
7305 | /* Get channel */ | |
ee022399 | 7306 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
7307 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
7308 | /* If the session is found for the app, the channel must be there */ | |
a0377dfe | 7309 | LTTNG_ASSERT(ua_chan_node); |
fb83fe64 JD |
7310 | |
7311 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
7312 | ||
7313 | if (overwrite) { | |
70dd8162 MD |
7314 | uint64_t _lost; |
7315 | ||
fb83fe64 | 7316 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
7317 | consumer, &_lost); |
7318 | if (ret < 0) { | |
7319 | break; | |
7320 | } | |
7321 | (*lost) += _lost; | |
fb83fe64 | 7322 | } else { |
70dd8162 MD |
7323 | uint64_t _discarded; |
7324 | ||
fb83fe64 | 7325 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
7326 | ua_chan->key, consumer, &_discarded); |
7327 | if (ret < 0) { | |
7328 | break; | |
7329 | } | |
7330 | (*discarded) += _discarded; | |
fb83fe64 | 7331 | } |
fb83fe64 JD |
7332 | } |
7333 | ||
fb83fe64 JD |
7334 | rcu_read_unlock(); |
7335 | return ret; | |
7336 | } | |
c2561365 JD |
7337 | |
7338 | static | |
7339 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
7340 | struct ust_app *app) | |
7341 | { | |
7342 | int ret = 0; | |
7343 | struct ust_app_session *ua_sess; | |
7344 | ||
7345 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
7346 | ||
7347 | rcu_read_lock(); | |
7348 | ||
7349 | ua_sess = lookup_session_by_app(usess, app); | |
7350 | if (ua_sess == NULL) { | |
7351 | /* The session is in teardown process. Ignore and continue. */ | |
7352 | goto end; | |
7353 | } | |
7354 | ||
7355 | pthread_mutex_lock(&ua_sess->lock); | |
7356 | ||
7357 | if (ua_sess->deleted) { | |
7358 | goto end_unlock; | |
7359 | } | |
7360 | ||
7361 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 7362 | ret = lttng_ust_ctl_regenerate_statedump(app->sock, ua_sess->handle); |
c2561365 JD |
7363 | pthread_mutex_unlock(&app->sock_lock); |
7364 | ||
7365 | end_unlock: | |
7366 | pthread_mutex_unlock(&ua_sess->lock); | |
7367 | ||
7368 | end: | |
7369 | rcu_read_unlock(); | |
7370 | health_code_update(); | |
7371 | return ret; | |
7372 | } | |
7373 | ||
7374 | /* | |
7375 | * Regenerate the statedump for each app in the session. | |
7376 | */ | |
7377 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
7378 | { | |
7379 | int ret = 0; | |
7380 | struct lttng_ht_iter iter; | |
7381 | struct ust_app *app; | |
7382 | ||
7383 | DBG("Regenerating the metadata for all UST apps"); | |
7384 | ||
7385 | rcu_read_lock(); | |
7386 | ||
7387 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7388 | if (!app->compatible) { | |
7389 | continue; | |
7390 | } | |
7391 | ||
7392 | ret = ust_app_regenerate_statedump(usess, app); | |
7393 | if (ret < 0) { | |
7394 | /* Continue to the next app even on error */ | |
7395 | continue; | |
7396 | } | |
7397 | } | |
7398 | ||
7399 | rcu_read_unlock(); | |
7400 | ||
7401 | return 0; | |
7402 | } | |
5c408ad8 JD |
7403 | |
7404 | /* | |
7405 | * Rotate all the channels of a session. | |
7406 | * | |
6f6d3b69 | 7407 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 7408 | */ |
6f6d3b69 | 7409 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 7410 | { |
6f6d3b69 MD |
7411 | int ret; |
7412 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
7413 | struct lttng_ht_iter iter; |
7414 | struct ust_app *app; | |
7415 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 | 7416 | |
a0377dfe | 7417 | LTTNG_ASSERT(usess); |
5c408ad8 JD |
7418 | |
7419 | rcu_read_lock(); | |
7420 | ||
7421 | switch (usess->buffer_type) { | |
7422 | case LTTNG_BUFFER_PER_UID: | |
7423 | { | |
7424 | struct buffer_reg_uid *reg; | |
7425 | ||
7426 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7427 | struct buffer_reg_channel *buf_reg_chan; |
5c408ad8 JD |
7428 | struct consumer_socket *socket; |
7429 | ||
7430 | /* Get consumer socket to use to push the metadata.*/ | |
7431 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7432 | usess->consumer); | |
7433 | if (!socket) { | |
6f6d3b69 | 7434 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7435 | goto error; |
7436 | } | |
7437 | ||
5c408ad8 JD |
7438 | /* Rotate the data channels. */ |
7439 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3273699d | 7440 | buf_reg_chan, node.node) { |
5c408ad8 | 7441 | ret = consumer_rotate_channel(socket, |
3273699d | 7442 | buf_reg_chan->consumer_key, |
5c408ad8 | 7443 | usess->uid, usess->gid, |
d2956687 JG |
7444 | usess->consumer, |
7445 | /* is_metadata_channel */ false); | |
5c408ad8 | 7446 | if (ret < 0) { |
6f6d3b69 | 7447 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7448 | goto error; |
7449 | } | |
7450 | } | |
7451 | ||
db786d44 JR |
7452 | /* |
7453 | * The metadata channel might not be present. | |
7454 | * | |
7455 | * Consumer stream allocation can be done | |
7456 | * asynchronously and can fail on intermediary | |
7457 | * operations (i.e add context) and lead to data | |
7458 | * channels created with no metadata channel. | |
7459 | */ | |
7460 | if (!reg->registry->reg.ust->metadata_key) { | |
7461 | /* Skip since no metadata is present. */ | |
7462 | continue; | |
7463 | } | |
7464 | ||
5c408ad8 JD |
7465 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); |
7466 | ||
7467 | ret = consumer_rotate_channel(socket, | |
7468 | reg->registry->reg.ust->metadata_key, | |
7469 | usess->uid, usess->gid, | |
d2956687 JG |
7470 | usess->consumer, |
7471 | /* is_metadata_channel */ true); | |
5c408ad8 | 7472 | if (ret < 0) { |
6f6d3b69 | 7473 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7474 | goto error; |
7475 | } | |
5c408ad8 JD |
7476 | } |
7477 | break; | |
7478 | } | |
7479 | case LTTNG_BUFFER_PER_PID: | |
7480 | { | |
7481 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7482 | struct consumer_socket *socket; | |
7483 | struct lttng_ht_iter chan_iter; | |
7484 | struct ust_app_channel *ua_chan; | |
7485 | struct ust_app_session *ua_sess; | |
7486 | struct ust_registry_session *registry; | |
7487 | ||
7488 | ua_sess = lookup_session_by_app(usess, app); | |
7489 | if (!ua_sess) { | |
7490 | /* Session not associated with this app. */ | |
7491 | continue; | |
7492 | } | |
5c408ad8 JD |
7493 | |
7494 | /* Get the right consumer socket for the application. */ | |
7495 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7496 | usess->consumer); | |
7497 | if (!socket) { | |
6f6d3b69 | 7498 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7499 | goto error; |
7500 | } | |
7501 | ||
7502 | registry = get_session_registry(ua_sess); | |
7503 | if (!registry) { | |
6f6d3b69 MD |
7504 | DBG("Application session is being torn down. Skip application."); |
7505 | continue; | |
5c408ad8 JD |
7506 | } |
7507 | ||
5c408ad8 JD |
7508 | /* Rotate the data channels. */ |
7509 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7510 | ua_chan, node.node) { | |
470cc211 JG |
7511 | ret = consumer_rotate_channel(socket, |
7512 | ua_chan->key, | |
ff588497 JR |
7513 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7514 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7515 | ua_sess->consumer, |
7516 | /* is_metadata_channel */ false); | |
5c408ad8 | 7517 | if (ret < 0) { |
6f6d3b69 MD |
7518 | /* Per-PID buffer and application going away. */ |
7519 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7520 | continue; | |
7521 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7522 | goto error; |
7523 | } | |
7524 | } | |
7525 | ||
7526 | /* Rotate the metadata channel. */ | |
7527 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
7528 | ret = consumer_rotate_channel(socket, |
7529 | registry->metadata_key, | |
ff588497 JR |
7530 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7531 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7532 | ua_sess->consumer, |
7533 | /* is_metadata_channel */ true); | |
5c408ad8 | 7534 | if (ret < 0) { |
6f6d3b69 MD |
7535 | /* Per-PID buffer and application going away. */ |
7536 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7537 | continue; | |
7538 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7539 | goto error; |
7540 | } | |
5c408ad8 JD |
7541 | } |
7542 | break; | |
7543 | } | |
7544 | default: | |
a0377dfe | 7545 | abort(); |
5c408ad8 JD |
7546 | break; |
7547 | } | |
7548 | ||
6f6d3b69 | 7549 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
7550 | |
7551 | error: | |
7552 | rcu_read_unlock(); | |
6f6d3b69 | 7553 | return cmd_ret; |
5c408ad8 | 7554 | } |
d2956687 JG |
7555 | |
7556 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
7557 | const struct ltt_ust_session *usess) | |
7558 | { | |
7559 | enum lttng_error_code ret = LTTNG_OK; | |
7560 | struct lttng_ht_iter iter; | |
7561 | enum lttng_trace_chunk_status chunk_status; | |
7562 | char *pathname_index; | |
7563 | int fmt_ret; | |
7564 | ||
a0377dfe | 7565 | LTTNG_ASSERT(usess->current_trace_chunk); |
d2956687 JG |
7566 | rcu_read_lock(); |
7567 | ||
7568 | switch (usess->buffer_type) { | |
7569 | case LTTNG_BUFFER_PER_UID: | |
7570 | { | |
7571 | struct buffer_reg_uid *reg; | |
7572 | ||
7573 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7574 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7575 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7576 | reg->uid, reg->bits_per_long); |
7577 | if (fmt_ret < 0) { | |
7578 | ERR("Failed to format channel index directory"); | |
7579 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7580 | goto error; | |
7581 | } | |
7582 | ||
7583 | /* | |
7584 | * Create the index subdirectory which will take care | |
7585 | * of implicitly creating the channel's path. | |
7586 | */ | |
7587 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7588 | usess->current_trace_chunk, | |
7589 | pathname_index); | |
7590 | free(pathname_index); | |
7591 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7592 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7593 | goto error; | |
7594 | } | |
7595 | } | |
7596 | break; | |
7597 | } | |
7598 | case LTTNG_BUFFER_PER_PID: | |
7599 | { | |
7600 | struct ust_app *app; | |
7601 | ||
495dece5 MD |
7602 | /* |
7603 | * Create the toplevel ust/ directory in case no apps are running. | |
7604 | */ | |
7605 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7606 | usess->current_trace_chunk, | |
7607 | DEFAULT_UST_TRACE_DIR); | |
7608 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7609 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7610 | goto error; | |
7611 | } | |
7612 | ||
d2956687 JG |
7613 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
7614 | pid_n.node) { | |
7615 | struct ust_app_session *ua_sess; | |
7616 | struct ust_registry_session *registry; | |
7617 | ||
7618 | ua_sess = lookup_session_by_app(usess, app); | |
7619 | if (!ua_sess) { | |
7620 | /* Session not associated with this app. */ | |
7621 | continue; | |
7622 | } | |
7623 | ||
7624 | registry = get_session_registry(ua_sess); | |
7625 | if (!registry) { | |
7626 | DBG("Application session is being torn down. Skip application."); | |
7627 | continue; | |
7628 | } | |
7629 | ||
7630 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7631 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7632 | ua_sess->path); |
7633 | if (fmt_ret < 0) { | |
7634 | ERR("Failed to format channel index directory"); | |
7635 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7636 | goto error; | |
7637 | } | |
7638 | /* | |
7639 | * Create the index subdirectory which will take care | |
7640 | * of implicitly creating the channel's path. | |
7641 | */ | |
7642 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7643 | usess->current_trace_chunk, | |
7644 | pathname_index); | |
7645 | free(pathname_index); | |
7646 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7647 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7648 | goto error; | |
7649 | } | |
7650 | } | |
7651 | break; | |
7652 | } | |
7653 | default: | |
7654 | abort(); | |
7655 | } | |
7656 | ||
7657 | ret = LTTNG_OK; | |
7658 | error: | |
7659 | rcu_read_unlock(); | |
7660 | return ret; | |
7661 | } | |
4a9b9759 MD |
7662 | |
7663 | /* | |
7664 | * Clear all the channels of a session. | |
7665 | * | |
7666 | * Return LTTNG_OK on success or else an LTTng error code. | |
7667 | */ | |
7668 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
7669 | { | |
7670 | int ret; | |
7671 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
7672 | struct lttng_ht_iter iter; | |
7673 | struct ust_app *app; | |
7674 | struct ltt_ust_session *usess = session->ust_session; | |
7675 | ||
a0377dfe | 7676 | LTTNG_ASSERT(usess); |
4a9b9759 MD |
7677 | |
7678 | rcu_read_lock(); | |
7679 | ||
7680 | if (usess->active) { | |
7681 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
7682 | cmd_ret = LTTNG_ERR_FATAL; | |
7683 | goto end; | |
7684 | } | |
7685 | ||
7686 | switch (usess->buffer_type) { | |
7687 | case LTTNG_BUFFER_PER_UID: | |
7688 | { | |
7689 | struct buffer_reg_uid *reg; | |
7690 | ||
7691 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7692 | struct buffer_reg_channel *buf_reg_chan; |
4a9b9759 MD |
7693 | struct consumer_socket *socket; |
7694 | ||
7695 | /* Get consumer socket to use to push the metadata.*/ | |
7696 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7697 | usess->consumer); | |
7698 | if (!socket) { | |
7699 | cmd_ret = LTTNG_ERR_INVALID; | |
7700 | goto error_socket; | |
7701 | } | |
7702 | ||
7703 | /* Clear the data channels. */ | |
7704 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3273699d | 7705 | buf_reg_chan, node.node) { |
4a9b9759 | 7706 | ret = consumer_clear_channel(socket, |
3273699d | 7707 | buf_reg_chan->consumer_key); |
4a9b9759 MD |
7708 | if (ret < 0) { |
7709 | goto error; | |
7710 | } | |
7711 | } | |
7712 | ||
7713 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7714 | ||
7715 | /* | |
7716 | * Clear the metadata channel. | |
7717 | * Metadata channel is not cleared per se but we still need to | |
7718 | * perform a rotation operation on it behind the scene. | |
7719 | */ | |
7720 | ret = consumer_clear_channel(socket, | |
7721 | reg->registry->reg.ust->metadata_key); | |
7722 | if (ret < 0) { | |
7723 | goto error; | |
7724 | } | |
7725 | } | |
7726 | break; | |
7727 | } | |
7728 | case LTTNG_BUFFER_PER_PID: | |
7729 | { | |
7730 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7731 | struct consumer_socket *socket; | |
7732 | struct lttng_ht_iter chan_iter; | |
7733 | struct ust_app_channel *ua_chan; | |
7734 | struct ust_app_session *ua_sess; | |
7735 | struct ust_registry_session *registry; | |
7736 | ||
7737 | ua_sess = lookup_session_by_app(usess, app); | |
7738 | if (!ua_sess) { | |
7739 | /* Session not associated with this app. */ | |
7740 | continue; | |
7741 | } | |
7742 | ||
7743 | /* Get the right consumer socket for the application. */ | |
7744 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7745 | usess->consumer); | |
7746 | if (!socket) { | |
7747 | cmd_ret = LTTNG_ERR_INVALID; | |
7748 | goto error_socket; | |
7749 | } | |
7750 | ||
7751 | registry = get_session_registry(ua_sess); | |
7752 | if (!registry) { | |
7753 | DBG("Application session is being torn down. Skip application."); | |
7754 | continue; | |
7755 | } | |
7756 | ||
7757 | /* Clear the data channels. */ | |
7758 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7759 | ua_chan, node.node) { | |
7760 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7761 | if (ret < 0) { | |
7762 | /* Per-PID buffer and application going away. */ | |
7763 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7764 | continue; | |
7765 | } | |
7766 | goto error; | |
7767 | } | |
7768 | } | |
7769 | ||
7770 | (void) push_metadata(registry, usess->consumer); | |
7771 | ||
7772 | /* | |
7773 | * Clear the metadata channel. | |
7774 | * Metadata channel is not cleared per se but we still need to | |
7775 | * perform rotation operation on it behind the scene. | |
7776 | */ | |
7777 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7778 | if (ret < 0) { | |
7779 | /* Per-PID buffer and application going away. */ | |
7780 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7781 | continue; | |
7782 | } | |
7783 | goto error; | |
7784 | } | |
7785 | } | |
7786 | break; | |
7787 | } | |
7788 | default: | |
a0377dfe | 7789 | abort(); |
4a9b9759 MD |
7790 | break; |
7791 | } | |
7792 | ||
7793 | cmd_ret = LTTNG_OK; | |
7794 | goto end; | |
7795 | ||
7796 | error: | |
7797 | switch (-ret) { | |
7798 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7799 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7800 | break; | |
7801 | default: | |
7802 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7803 | } | |
7804 | ||
7805 | error_socket: | |
7806 | end: | |
7807 | rcu_read_unlock(); | |
7808 | return cmd_ret; | |
7809 | } | |
04ed9e10 JG |
7810 | |
7811 | /* | |
7812 | * This function skips the metadata channel as the begin/end timestamps of a | |
7813 | * metadata packet are useless. | |
7814 | * | |
7815 | * Moreover, opening a packet after a "clear" will cause problems for live | |
7816 | * sessions as it will introduce padding that was not part of the first trace | |
7817 | * chunk. The relay daemon expects the content of the metadata stream of | |
7818 | * successive metadata trace chunks to be strict supersets of one another. | |
7819 | * | |
7820 | * For example, flushing a packet at the beginning of the metadata stream of | |
7821 | * a trace chunk resulting from a "clear" session command will cause the | |
7822 | * size of the metadata stream of the new trace chunk to not match the size of | |
7823 | * the metadata stream of the original chunk. This will confuse the relay | |
7824 | * daemon as the same "offset" in a metadata stream will no longer point | |
7825 | * to the same content. | |
7826 | */ | |
7827 | enum lttng_error_code ust_app_open_packets(struct ltt_session *session) | |
7828 | { | |
7829 | enum lttng_error_code ret = LTTNG_OK; | |
7830 | struct lttng_ht_iter iter; | |
7831 | struct ltt_ust_session *usess = session->ust_session; | |
7832 | ||
a0377dfe | 7833 | LTTNG_ASSERT(usess); |
04ed9e10 JG |
7834 | |
7835 | rcu_read_lock(); | |
7836 | ||
7837 | switch (usess->buffer_type) { | |
7838 | case LTTNG_BUFFER_PER_UID: | |
7839 | { | |
7840 | struct buffer_reg_uid *reg; | |
7841 | ||
7842 | cds_list_for_each_entry ( | |
7843 | reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7844 | struct buffer_reg_channel *buf_reg_chan; |
04ed9e10 JG |
7845 | struct consumer_socket *socket; |
7846 | ||
7847 | socket = consumer_find_socket_by_bitness( | |
7848 | reg->bits_per_long, usess->consumer); | |
7849 | if (!socket) { | |
7850 | ret = LTTNG_ERR_FATAL; | |
7851 | goto error; | |
7852 | } | |
7853 | ||
7854 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
3273699d | 7855 | &iter.iter, buf_reg_chan, node.node) { |
04ed9e10 JG |
7856 | const int open_ret = |
7857 | consumer_open_channel_packets( | |
7858 | socket, | |
3273699d | 7859 | buf_reg_chan->consumer_key); |
04ed9e10 JG |
7860 | |
7861 | if (open_ret < 0) { | |
7862 | ret = LTTNG_ERR_UNK; | |
7863 | goto error; | |
7864 | } | |
7865 | } | |
7866 | } | |
7867 | break; | |
7868 | } | |
7869 | case LTTNG_BUFFER_PER_PID: | |
7870 | { | |
7871 | struct ust_app *app; | |
7872 | ||
7873 | cds_lfht_for_each_entry ( | |
7874 | ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7875 | struct consumer_socket *socket; | |
7876 | struct lttng_ht_iter chan_iter; | |
7877 | struct ust_app_channel *ua_chan; | |
7878 | struct ust_app_session *ua_sess; | |
7879 | struct ust_registry_session *registry; | |
7880 | ||
7881 | ua_sess = lookup_session_by_app(usess, app); | |
7882 | if (!ua_sess) { | |
7883 | /* Session not associated with this app. */ | |
7884 | continue; | |
7885 | } | |
7886 | ||
7887 | /* Get the right consumer socket for the application. */ | |
7888 | socket = consumer_find_socket_by_bitness( | |
7889 | app->bits_per_long, usess->consumer); | |
7890 | if (!socket) { | |
7891 | ret = LTTNG_ERR_FATAL; | |
7892 | goto error; | |
7893 | } | |
7894 | ||
7895 | registry = get_session_registry(ua_sess); | |
7896 | if (!registry) { | |
7897 | DBG("Application session is being torn down. Skip application."); | |
7898 | continue; | |
7899 | } | |
7900 | ||
7901 | cds_lfht_for_each_entry(ua_sess->channels->ht, | |
7902 | &chan_iter.iter, ua_chan, node.node) { | |
7903 | const int open_ret = | |
7904 | consumer_open_channel_packets( | |
7905 | socket, | |
7906 | ua_chan->key); | |
7907 | ||
7908 | if (open_ret < 0) { | |
7909 | /* | |
7910 | * Per-PID buffer and application going | |
7911 | * away. | |
7912 | */ | |
97a171e1 | 7913 | if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
04ed9e10 JG |
7914 | continue; |
7915 | } | |
7916 | ||
7917 | ret = LTTNG_ERR_UNK; | |
7918 | goto error; | |
7919 | } | |
7920 | } | |
7921 | } | |
7922 | break; | |
7923 | } | |
7924 | default: | |
7925 | abort(); | |
7926 | break; | |
7927 | } | |
7928 | ||
7929 | error: | |
7930 | rcu_read_unlock(); | |
7931 | return ret; | |
7932 | } |