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