Commit | Line | Data |
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91d76f53 | 1 | /* |
90c106c6 | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa | 3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
91d76f53 | 6 | * |
91d76f53 DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
533a90fb FD |
10 | #include <errno.h> |
11 | #include <fcntl.h> | |
7972aab2 | 12 | #include <inttypes.h> |
91d76f53 DG |
13 | #include <pthread.h> |
14 | #include <stdio.h> | |
15 | #include <stdlib.h> | |
099e26bd | 16 | #include <string.h> |
533a90fb | 17 | #include <sys/mman.h> |
aba8e916 DG |
18 | #include <sys/stat.h> |
19 | #include <sys/types.h> | |
099e26bd | 20 | #include <unistd.h> |
0df502fd | 21 | #include <urcu/compiler.h> |
331744e3 | 22 | #include <signal.h> |
bec39940 | 23 | |
763f0d4c | 24 | #include <common/bytecode/bytecode.h> |
edf4b93e | 25 | #include <common/compat/errno.h> |
990570ed | 26 | #include <common/common.h> |
993578ff JR |
27 | #include <common/hashtable/utils.h> |
28 | #include <lttng/event-rule/event-rule.h> | |
29 | #include <lttng/event-rule/event-rule-internal.h> | |
45ce77e1 | 30 | #include <lttng/event-rule/user-tracepoint.h> |
993578ff | 31 | #include <lttng/condition/condition.h> |
670a26e4 JR |
32 | #include <lttng/condition/event-rule-matches-internal.h> |
33 | #include <lttng/condition/event-rule-matches.h> | |
f83be61d | 34 | #include <lttng/trigger/trigger-internal.h> |
86acf0da | 35 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 36 | |
7972aab2 | 37 | #include "buffer-registry.h" |
533a90fb | 38 | #include "condition-internal.h" |
86acf0da | 39 | #include "fd-limit.h" |
8782cc74 | 40 | #include "health-sessiond.h" |
56fff090 | 41 | #include "ust-app.h" |
48842b30 | 42 | #include "ust-consumer.h" |
75018ab6 JG |
43 | #include "lttng-ust-ctl.h" |
44 | #include "lttng-ust-error.h" | |
0b2dc8df | 45 | #include "utils.h" |
fb83fe64 | 46 | #include "session.h" |
e9404c27 JG |
47 | #include "lttng-sessiond.h" |
48 | #include "notification-thread-commands.h" | |
5c408ad8 | 49 | #include "rotate.h" |
44760c20 | 50 | #include "event.h" |
533a90fb | 51 | #include "event-notifier-error-accounting.h" |
28dc0326 | 52 | #include "ust-field-utils.h" |
d80a6244 | 53 | |
44cdb3a2 MJ |
54 | struct lttng_ht *ust_app_ht; |
55 | struct lttng_ht *ust_app_ht_by_sock; | |
56 | struct lttng_ht *ust_app_ht_by_notify_sock; | |
57 | ||
c4b88406 MD |
58 | static |
59 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
60 | ||
d9bf3ca4 MD |
61 | /* Next available channel key. Access under next_channel_key_lock. */ |
62 | static uint64_t _next_channel_key; | |
63 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
64 | ||
65 | /* Next available session ID. Access under next_session_id_lock. */ | |
66 | static uint64_t _next_session_id; | |
67 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
68 | |
69 | /* | |
d9bf3ca4 | 70 | * Return the incremented value of next_channel_key. |
ffe60014 | 71 | */ |
d9bf3ca4 | 72 | static uint64_t get_next_channel_key(void) |
ffe60014 | 73 | { |
d9bf3ca4 MD |
74 | uint64_t ret; |
75 | ||
76 | pthread_mutex_lock(&next_channel_key_lock); | |
77 | ret = ++_next_channel_key; | |
78 | pthread_mutex_unlock(&next_channel_key_lock); | |
79 | return ret; | |
ffe60014 DG |
80 | } |
81 | ||
82 | /* | |
7972aab2 | 83 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 84 | */ |
d9bf3ca4 | 85 | static uint64_t get_next_session_id(void) |
ffe60014 | 86 | { |
d9bf3ca4 MD |
87 | uint64_t ret; |
88 | ||
89 | pthread_mutex_lock(&next_session_id_lock); | |
90 | ret = ++_next_session_id; | |
91 | pthread_mutex_unlock(&next_session_id_lock); | |
92 | return ret; | |
ffe60014 DG |
93 | } |
94 | ||
d65d2de8 | 95 | static void copy_channel_attr_to_ustctl( |
b623cb6a | 96 | struct lttng_ust_ctl_consumer_channel_attr *attr, |
fc4b93fa | 97 | struct lttng_ust_abi_channel_attr *uattr) |
d65d2de8 DG |
98 | { |
99 | /* Copy event attributes since the layout is different. */ | |
100 | attr->subbuf_size = uattr->subbuf_size; | |
101 | attr->num_subbuf = uattr->num_subbuf; | |
102 | attr->overwrite = uattr->overwrite; | |
103 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
104 | attr->read_timer_interval = uattr->read_timer_interval; | |
105 | attr->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; | |
119 | ||
120 | assert(node); | |
121 | assert(_key); | |
122 | ||
123 | event = caa_container_of(node, struct ust_app_event, node.node); | |
124 | key = _key; | |
125 | ||
1af53eb5 | 126 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
127 | |
128 | /* Event name */ | |
129 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
130 | goto no_match; | |
131 | } | |
132 | ||
133 | /* Event loglevel. */ | |
1083b49a JG |
134 | if (!loglevels_match(event->attr.loglevel_type, event->attr.loglevel, |
135 | key->loglevel_type, key->loglevel_value, | |
136 | LTTNG_UST_ABI_LOGLEVEL_ALL)) { | |
137 | goto no_match; | |
18eace3b DG |
138 | } |
139 | ||
140 | /* One of the filters is NULL, fail. */ | |
141 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
142 | goto no_match; | |
143 | } | |
144 | ||
025faf73 DG |
145 | if (key->filter && event->filter) { |
146 | /* Both filters exists, check length followed by the bytecode. */ | |
147 | if (event->filter->len != key->filter->len || | |
148 | memcmp(event->filter->data, key->filter->data, | |
149 | event->filter->len) != 0) { | |
150 | goto no_match; | |
151 | } | |
18eace3b DG |
152 | } |
153 | ||
1af53eb5 JI |
154 | /* One of the exclusions is NULL, fail. */ |
155 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
156 | goto no_match; | |
157 | } | |
158 | ||
159 | if (key->exclusion && event->exclusion) { | |
160 | /* Both exclusions exists, check count followed by the names. */ | |
161 | if (event->exclusion->count != key->exclusion->count || | |
162 | memcmp(event->exclusion->names, key->exclusion->names, | |
fc4b93fa | 163 | event->exclusion->count * LTTNG_UST_ABI_SYM_NAME_LEN) != 0) { |
1af53eb5 JI |
164 | goto no_match; |
165 | } | |
166 | } | |
167 | ||
168 | ||
025faf73 | 169 | /* Match. */ |
18eace3b DG |
170 | return 1; |
171 | ||
172 | no_match: | |
173 | return 0; | |
18eace3b DG |
174 | } |
175 | ||
025faf73 DG |
176 | /* |
177 | * Unique add of an ust app event in the given ht. This uses the custom | |
178 | * ht_match_ust_app_event match function and the event name as hash. | |
179 | */ | |
d0b96690 | 180 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
181 | struct ust_app_event *event) |
182 | { | |
183 | struct cds_lfht_node *node_ptr; | |
184 | struct ust_app_ht_key key; | |
d0b96690 | 185 | struct lttng_ht *ht; |
18eace3b | 186 | |
d0b96690 DG |
187 | assert(ua_chan); |
188 | assert(ua_chan->events); | |
18eace3b DG |
189 | assert(event); |
190 | ||
d0b96690 | 191 | ht = ua_chan->events; |
18eace3b DG |
192 | key.name = event->attr.name; |
193 | key.filter = event->filter; | |
1083b49a JG |
194 | key.loglevel_type = (enum lttng_ust_abi_loglevel_type) |
195 | event->attr.loglevel_type; | |
196 | key.loglevel_value = event->attr.loglevel; | |
91c89f23 | 197 | key.exclusion = event->exclusion; |
18eace3b DG |
198 | |
199 | node_ptr = cds_lfht_add_unique(ht->ht, | |
200 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
201 | ht_match_ust_app_event, &key, &event->node.node); | |
202 | assert(node_ptr == &event->node.node); | |
203 | } | |
204 | ||
d88aee68 DG |
205 | /* |
206 | * Close the notify socket from the given RCU head object. This MUST be called | |
207 | * through a call_rcu(). | |
208 | */ | |
209 | static void close_notify_sock_rcu(struct rcu_head *head) | |
210 | { | |
211 | int ret; | |
212 | struct ust_app_notify_sock_obj *obj = | |
213 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
214 | ||
215 | /* Must have a valid fd here. */ | |
216 | assert(obj->fd >= 0); | |
217 | ||
218 | ret = close(obj->fd); | |
219 | if (ret) { | |
220 | ERR("close notify sock %d RCU", obj->fd); | |
221 | } | |
222 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
223 | ||
224 | free(obj); | |
225 | } | |
226 | ||
7972aab2 DG |
227 | /* |
228 | * Return the session registry according to the buffer type of the given | |
229 | * session. | |
230 | * | |
231 | * A registry per UID object MUST exists before calling this function or else | |
232 | * it assert() if not found. RCU read side lock must be acquired. | |
233 | */ | |
234 | static struct ust_registry_session *get_session_registry( | |
235 | struct ust_app_session *ua_sess) | |
236 | { | |
237 | struct ust_registry_session *registry = NULL; | |
238 | ||
239 | assert(ua_sess); | |
240 | ||
241 | switch (ua_sess->buffer_type) { | |
242 | case LTTNG_BUFFER_PER_PID: | |
243 | { | |
244 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
245 | if (!reg_pid) { | |
246 | goto error; | |
247 | } | |
248 | registry = reg_pid->registry->reg.ust; | |
249 | break; | |
250 | } | |
251 | case LTTNG_BUFFER_PER_UID: | |
252 | { | |
253 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 | 254 | ua_sess->tracing_id, ua_sess->bits_per_long, |
ff588497 | 255 | lttng_credentials_get_uid(&ua_sess->real_credentials)); |
7972aab2 DG |
256 | if (!reg_uid) { |
257 | goto error; | |
258 | } | |
259 | registry = reg_uid->registry->reg.ust; | |
260 | break; | |
261 | } | |
262 | default: | |
263 | assert(0); | |
264 | }; | |
265 | ||
266 | error: | |
267 | return registry; | |
268 | } | |
269 | ||
55cc08a6 DG |
270 | /* |
271 | * Delete ust context safely. RCU read lock must be held before calling | |
272 | * this function. | |
273 | */ | |
274 | static | |
fb45065e MD |
275 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
276 | struct ust_app *app) | |
55cc08a6 | 277 | { |
ffe60014 DG |
278 | int ret; |
279 | ||
280 | assert(ua_ctx); | |
281 | ||
55cc08a6 | 282 | if (ua_ctx->obj) { |
fb45065e | 283 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 284 | ret = lttng_ust_ctl_release_object(sock, ua_ctx->obj); |
fb45065e | 285 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
286 | if (ret < 0) { |
287 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
288 | DBG3("UST app release ctx failed. Application is dead: pid = %d, sock = %d", | |
289 | app->pid, app->sock); | |
290 | } else if (ret == -EAGAIN) { | |
291 | WARN("UST app release ctx failed. Communication time out: pid = %d, sock = %d", | |
292 | app->pid, app->sock); | |
293 | } else { | |
294 | ERR("UST app release ctx obj handle %d failed with ret %d: pid = %d, sock = %d", | |
295 | ua_ctx->obj->handle, ret, | |
296 | app->pid, app->sock); | |
297 | } | |
ffe60014 | 298 | } |
55cc08a6 DG |
299 | free(ua_ctx->obj); |
300 | } | |
301 | free(ua_ctx); | |
302 | } | |
303 | ||
d80a6244 DG |
304 | /* |
305 | * Delete ust app event safely. RCU read lock must be held before calling | |
306 | * this function. | |
307 | */ | |
8b366481 | 308 | static |
fb45065e MD |
309 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
310 | struct ust_app *app) | |
d80a6244 | 311 | { |
ffe60014 DG |
312 | int ret; |
313 | ||
314 | assert(ua_event); | |
315 | ||
53a80697 | 316 | free(ua_event->filter); |
951f0b71 JI |
317 | if (ua_event->exclusion != NULL) |
318 | free(ua_event->exclusion); | |
edb67388 | 319 | if (ua_event->obj != NULL) { |
fb45065e | 320 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 321 | ret = lttng_ust_ctl_release_object(sock, ua_event->obj); |
fb45065e | 322 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
323 | if (ret < 0) { |
324 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
325 | DBG3("UST app release event failed. Application is dead: pid = %d, sock = %d", | |
326 | app->pid, app->sock); | |
327 | } else if (ret == -EAGAIN) { | |
328 | WARN("UST app release event failed. Communication time out: pid = %d, sock = %d", | |
329 | app->pid, app->sock); | |
330 | } else { | |
331 | ERR("UST app release event obj failed with ret %d: pid = %d, sock = %d", | |
332 | ret, app->pid, app->sock); | |
333 | } | |
ffe60014 | 334 | } |
edb67388 DG |
335 | free(ua_event->obj); |
336 | } | |
d80a6244 DG |
337 | free(ua_event); |
338 | } | |
339 | ||
993578ff JR |
340 | /* |
341 | * Delayed reclaim of a ust_app_event_notifier_rule object. This MUST be called | |
342 | * through a call_rcu(). | |
343 | */ | |
344 | static | |
345 | void free_ust_app_event_notifier_rule_rcu(struct rcu_head *head) | |
346 | { | |
347 | struct ust_app_event_notifier_rule *obj = caa_container_of( | |
348 | head, struct ust_app_event_notifier_rule, rcu_head); | |
349 | ||
350 | free(obj); | |
351 | } | |
352 | ||
353 | /* | |
354 | * Delete ust app event notifier rule safely. | |
355 | */ | |
356 | static void delete_ust_app_event_notifier_rule(int sock, | |
357 | struct ust_app_event_notifier_rule *ua_event_notifier_rule, | |
358 | struct ust_app *app) | |
359 | { | |
360 | int ret; | |
361 | ||
362 | assert(ua_event_notifier_rule); | |
363 | ||
364 | if (ua_event_notifier_rule->exclusion != NULL) { | |
365 | free(ua_event_notifier_rule->exclusion); | |
366 | } | |
367 | ||
368 | if (ua_event_notifier_rule->obj != NULL) { | |
369 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 370 | ret = lttng_ust_ctl_release_object(sock, ua_event_notifier_rule->obj); |
993578ff | 371 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
372 | if (ret < 0) { |
373 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
374 | DBG3("UST app release event notifier failed. Application is dead: pid = %d, sock = %d", | |
375 | app->pid, app->sock); | |
376 | } else if (ret == -EAGAIN) { | |
377 | WARN("UST app release event notifier failed. Communication time out: pid = %d, sock = %d", | |
378 | app->pid, app->sock); | |
379 | } else { | |
380 | ERR("UST app release event notifier failed with ret %d: pid = %d, sock = %d", | |
381 | ret, app->pid, app->sock); | |
382 | } | |
993578ff JR |
383 | } |
384 | ||
385 | free(ua_event_notifier_rule->obj); | |
386 | } | |
387 | ||
267d66aa | 388 | lttng_trigger_put(ua_event_notifier_rule->trigger); |
993578ff JR |
389 | call_rcu(&ua_event_notifier_rule->rcu_head, |
390 | free_ust_app_event_notifier_rule_rcu); | |
391 | } | |
392 | ||
d80a6244 | 393 | /* |
7972aab2 DG |
394 | * Release ust data object of the given stream. |
395 | * | |
396 | * Return 0 on success or else a negative value. | |
d80a6244 | 397 | */ |
fb45065e MD |
398 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
399 | struct ust_app *app) | |
d80a6244 | 400 | { |
7972aab2 | 401 | int ret = 0; |
ffe60014 DG |
402 | |
403 | assert(stream); | |
404 | ||
8b366481 | 405 | if (stream->obj) { |
fb45065e | 406 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 407 | ret = lttng_ust_ctl_release_object(sock, stream->obj); |
fb45065e | 408 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
409 | if (ret < 0) { |
410 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
411 | DBG3("UST app release stream failed. Application is dead: pid = %d, sock = %d", | |
412 | app->pid, app->sock); | |
413 | } else if (ret == -EAGAIN) { | |
414 | WARN("UST app release stream failed. Communication time out: pid = %d, sock = %d", | |
415 | app->pid, app->sock); | |
416 | } else { | |
417 | ERR("UST app release stream obj failed with ret %d: pid = %d, sock = %d", | |
418 | ret, app->pid, app->sock); | |
419 | } | |
ffe60014 | 420 | } |
4063050c | 421 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
422 | free(stream->obj); |
423 | } | |
7972aab2 DG |
424 | |
425 | return ret; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Delete ust app stream safely. RCU read lock must be held before calling | |
430 | * this function. | |
431 | */ | |
432 | static | |
fb45065e MD |
433 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
434 | struct ust_app *app) | |
7972aab2 DG |
435 | { |
436 | assert(stream); | |
437 | ||
fb45065e | 438 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 439 | free(stream); |
d80a6244 DG |
440 | } |
441 | ||
36b588ed MD |
442 | /* |
443 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
444 | * section and outside of call_rcu thread, so we postpone its execution |
445 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
446 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
447 | */ |
448 | static | |
449 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
450 | { | |
451 | struct ust_app_channel *ua_chan = | |
452 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
453 | ||
0b2dc8df MD |
454 | ht_cleanup_push(ua_chan->ctx); |
455 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
456 | free(ua_chan); |
457 | } | |
458 | ||
fb83fe64 JD |
459 | /* |
460 | * Extract the lost packet or discarded events counter when the channel is | |
461 | * being deleted and store the value in the parent channel so we can | |
462 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
463 | * |
464 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
465 | */ |
466 | static | |
467 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
468 | { | |
469 | uint64_t discarded = 0, lost = 0; | |
470 | struct ltt_session *session; | |
471 | struct ltt_ust_channel *uchan; | |
472 | ||
fc4b93fa | 473 | if (ua_chan->attr.type != LTTNG_UST_ABI_CHAN_PER_CPU) { |
fb83fe64 JD |
474 | return; |
475 | } | |
476 | ||
477 | rcu_read_lock(); | |
478 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
479 | if (!session || !session->ust_session) { |
480 | /* | |
481 | * Not finding the session is not an error because there are | |
482 | * multiple ways the channels can be torn down. | |
483 | * | |
484 | * 1) The session daemon can initiate the destruction of the | |
485 | * ust app session after receiving a destroy command or | |
486 | * during its shutdown/teardown. | |
487 | * 2) The application, since we are in per-pid tracing, is | |
488 | * unregistering and tearing down its ust app session. | |
489 | * | |
490 | * Both paths are protected by the session list lock which | |
491 | * ensures that the accounting of lost packets and discarded | |
492 | * events is done exactly once. The session is then unpublished | |
493 | * from the session list, resulting in this condition. | |
494 | */ | |
fb83fe64 JD |
495 | goto end; |
496 | } | |
497 | ||
498 | if (ua_chan->attr.overwrite) { | |
499 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
500 | ua_chan->key, session->ust_session->consumer, | |
501 | &lost); | |
502 | } else { | |
503 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
504 | ua_chan->key, session->ust_session->consumer, | |
505 | &discarded); | |
506 | } | |
507 | uchan = trace_ust_find_channel_by_name( | |
508 | session->ust_session->domain_global.channels, | |
509 | ua_chan->name); | |
510 | if (!uchan) { | |
511 | ERR("Missing UST channel to store discarded counters"); | |
512 | goto end; | |
513 | } | |
514 | ||
515 | uchan->per_pid_closed_app_discarded += discarded; | |
516 | uchan->per_pid_closed_app_lost += lost; | |
517 | ||
518 | end: | |
519 | rcu_read_unlock(); | |
e32d7f27 JG |
520 | if (session) { |
521 | session_put(session); | |
522 | } | |
fb83fe64 JD |
523 | } |
524 | ||
d80a6244 DG |
525 | /* |
526 | * Delete ust app channel safely. RCU read lock must be held before calling | |
527 | * this function. | |
82cac6d2 JG |
528 | * |
529 | * The session list lock must be held by the caller. | |
d80a6244 | 530 | */ |
8b366481 | 531 | static |
d0b96690 DG |
532 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
533 | struct ust_app *app) | |
d80a6244 DG |
534 | { |
535 | int ret; | |
bec39940 | 536 | struct lttng_ht_iter iter; |
d80a6244 | 537 | struct ust_app_event *ua_event; |
55cc08a6 | 538 | struct ust_app_ctx *ua_ctx; |
030a66fa | 539 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 540 | struct ust_registry_session *registry; |
d80a6244 | 541 | |
ffe60014 DG |
542 | assert(ua_chan); |
543 | ||
544 | DBG3("UST app deleting channel %s", ua_chan->name); | |
545 | ||
55cc08a6 | 546 | /* Wipe stream */ |
d80a6244 | 547 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 548 | cds_list_del(&stream->list); |
fb45065e | 549 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
550 | } |
551 | ||
55cc08a6 | 552 | /* Wipe context */ |
bec39940 | 553 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 554 | cds_list_del(&ua_ctx->list); |
bec39940 | 555 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 556 | assert(!ret); |
fb45065e | 557 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 558 | } |
d80a6244 | 559 | |
55cc08a6 | 560 | /* Wipe events */ |
bec39940 DG |
561 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
562 | node.node) { | |
563 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 564 | assert(!ret); |
fb45065e | 565 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 566 | } |
edb67388 | 567 | |
c8335706 MD |
568 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
569 | /* Wipe and free registry from session registry. */ | |
570 | registry = get_session_registry(ua_chan->session); | |
571 | if (registry) { | |
e9404c27 | 572 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
573 | sock >= 0); |
574 | } | |
45798a31 JG |
575 | /* |
576 | * A negative socket can be used by the caller when | |
577 | * cleaning-up a ua_chan in an error path. Skip the | |
578 | * accounting in this case. | |
579 | */ | |
e38d96f9 MD |
580 | if (sock >= 0) { |
581 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 582 | } |
7972aab2 | 583 | } |
d0b96690 | 584 | |
edb67388 | 585 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
586 | /* Remove channel from application UST object descriptor. */ |
587 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
588 | ret = lttng_ht_del(app->ust_objd, &iter); |
589 | assert(!ret); | |
fb45065e | 590 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 591 | ret = lttng_ust_ctl_release_object(sock, ua_chan->obj); |
fb45065e | 592 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
593 | if (ret < 0) { |
594 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
595 | DBG3("UST app channel %s release failed. Application is dead: pid = %d, sock = %d", | |
596 | ua_chan->name, app->pid, | |
597 | app->sock); | |
598 | } else if (ret == -EAGAIN) { | |
599 | WARN("UST app channel %s release failed. Communication time out: pid = %d, sock = %d", | |
600 | ua_chan->name, app->pid, | |
601 | app->sock); | |
602 | } else { | |
603 | ERR("UST app channel %s release failed with ret %d: pid = %d, sock = %d", | |
604 | ua_chan->name, ret, app->pid, | |
605 | app->sock); | |
606 | } | |
ffe60014 | 607 | } |
7972aab2 | 608 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
609 | free(ua_chan->obj); |
610 | } | |
36b588ed | 611 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
612 | } |
613 | ||
fb45065e MD |
614 | int ust_app_register_done(struct ust_app *app) |
615 | { | |
616 | int ret; | |
617 | ||
618 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 619 | ret = lttng_ust_ctl_register_done(app->sock); |
fb45065e MD |
620 | pthread_mutex_unlock(&app->sock_lock); |
621 | return ret; | |
622 | } | |
623 | ||
fc4b93fa | 624 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data) |
fb45065e MD |
625 | { |
626 | int ret, sock; | |
627 | ||
628 | if (app) { | |
629 | pthread_mutex_lock(&app->sock_lock); | |
630 | sock = app->sock; | |
631 | } else { | |
632 | sock = -1; | |
633 | } | |
b623cb6a | 634 | ret = lttng_ust_ctl_release_object(sock, data); |
fb45065e MD |
635 | if (app) { |
636 | pthread_mutex_unlock(&app->sock_lock); | |
637 | } | |
638 | return ret; | |
639 | } | |
640 | ||
331744e3 | 641 | /* |
1b532a60 DG |
642 | * Push metadata to consumer socket. |
643 | * | |
dc2bbdae MD |
644 | * RCU read-side lock must be held to guarantee existance of socket. |
645 | * Must be called with the ust app session lock held. | |
646 | * Must be called with the registry lock held. | |
331744e3 JD |
647 | * |
648 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
649 | * Returning a -EPIPE return value means we could not send the metadata, |
650 | * but it can be caused by recoverable errors (e.g. the application has | |
651 | * terminated concurrently). | |
331744e3 JD |
652 | */ |
653 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
654 | struct consumer_socket *socket, int send_zero_data) | |
655 | { | |
656 | int ret; | |
657 | char *metadata_str = NULL; | |
c585821b | 658 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 659 | ssize_t ret_val; |
93ec662e | 660 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
661 | |
662 | assert(registry); | |
663 | assert(socket); | |
1b532a60 | 664 | |
c585821b MD |
665 | metadata_key = registry->metadata_key; |
666 | ||
ce34fcd0 | 667 | /* |
dc2bbdae MD |
668 | * Means that no metadata was assigned to the session. This can |
669 | * happens if no start has been done previously. | |
ce34fcd0 | 670 | */ |
c585821b | 671 | if (!metadata_key) { |
ce34fcd0 MD |
672 | return 0; |
673 | } | |
674 | ||
331744e3 JD |
675 | offset = registry->metadata_len_sent; |
676 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 677 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 678 | metadata_version = registry->metadata_version; |
331744e3 JD |
679 | if (len == 0) { |
680 | DBG3("No metadata to push for metadata key %" PRIu64, | |
681 | registry->metadata_key); | |
682 | ret_val = len; | |
683 | if (send_zero_data) { | |
684 | DBG("No metadata to push"); | |
685 | goto push_data; | |
686 | } | |
687 | goto end; | |
688 | } | |
689 | ||
690 | /* Allocate only what we have to send. */ | |
691 | metadata_str = zmalloc(len); | |
692 | if (!metadata_str) { | |
693 | PERROR("zmalloc ust app metadata string"); | |
694 | ret_val = -ENOMEM; | |
695 | goto error; | |
696 | } | |
c585821b | 697 | /* Copy what we haven't sent out. */ |
331744e3 | 698 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
699 | |
700 | push_data: | |
c585821b MD |
701 | pthread_mutex_unlock(®istry->lock); |
702 | /* | |
703 | * We need to unlock the registry while we push metadata to | |
704 | * break a circular dependency between the consumerd metadata | |
705 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
706 | * to the consumerd awaits that it gets pushed all the way to | |
707 | * relayd, but doing so requires grabbing the metadata lock. If | |
708 | * a concurrent metadata request is being performed by | |
709 | * consumerd, this can try to grab the registry lock on the | |
710 | * sessiond while holding the metadata lock on the consumer | |
711 | * daemon. Those push and pull schemes are performed on two | |
712 | * different bidirectionnal communication sockets. | |
713 | */ | |
714 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 715 | metadata_str, len, offset, metadata_version); |
c585821b | 716 | pthread_mutex_lock(®istry->lock); |
331744e3 | 717 | if (ret < 0) { |
000baf6a | 718 | /* |
dc2bbdae MD |
719 | * There is an acceptable race here between the registry |
720 | * metadata key assignment and the creation on the | |
721 | * consumer. The session daemon can concurrently push | |
722 | * metadata for this registry while being created on the | |
723 | * consumer since the metadata key of the registry is | |
724 | * assigned *before* it is setup to avoid the consumer | |
725 | * to ask for metadata that could possibly be not found | |
726 | * in the session daemon. | |
000baf6a | 727 | * |
dc2bbdae MD |
728 | * The metadata will get pushed either by the session |
729 | * being stopped or the consumer requesting metadata if | |
730 | * that race is triggered. | |
000baf6a DG |
731 | */ |
732 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
733 | ret = 0; | |
c585821b MD |
734 | } else { |
735 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 736 | } |
331744e3 JD |
737 | ret_val = ret; |
738 | goto error_push; | |
c585821b MD |
739 | } else { |
740 | /* | |
741 | * Metadata may have been concurrently pushed, since | |
742 | * we're not holding the registry lock while pushing to | |
743 | * consumer. This is handled by the fact that we send | |
744 | * the metadata content, size, and the offset at which | |
745 | * that metadata belongs. This may arrive out of order | |
746 | * on the consumer side, and the consumer is able to | |
747 | * deal with overlapping fragments. The consumer | |
748 | * supports overlapping fragments, which must be | |
749 | * contiguous starting from offset 0. We keep the | |
750 | * largest metadata_len_sent value of the concurrent | |
751 | * send. | |
752 | */ | |
753 | registry->metadata_len_sent = | |
754 | max_t(size_t, registry->metadata_len_sent, | |
755 | new_metadata_len_sent); | |
331744e3 | 756 | } |
331744e3 JD |
757 | free(metadata_str); |
758 | return len; | |
759 | ||
760 | end: | |
761 | error: | |
ce34fcd0 MD |
762 | if (ret_val) { |
763 | /* | |
dc2bbdae MD |
764 | * On error, flag the registry that the metadata is |
765 | * closed. We were unable to push anything and this | |
766 | * means that either the consumer is not responding or | |
767 | * the metadata cache has been destroyed on the | |
768 | * consumer. | |
ce34fcd0 MD |
769 | */ |
770 | registry->metadata_closed = 1; | |
771 | } | |
331744e3 JD |
772 | error_push: |
773 | free(metadata_str); | |
774 | return ret_val; | |
775 | } | |
776 | ||
d88aee68 | 777 | /* |
ce34fcd0 | 778 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
779 | * Either sock or consumer is required : if sock is NULL, the default |
780 | * socket to send the metadata is retrieved from consumer, if sock | |
781 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 782 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
783 | * therefore ensuring existance of registry. It also ensures existance |
784 | * of socket throughout this function. | |
d88aee68 DG |
785 | * |
786 | * Return 0 on success else a negative error. | |
2c57e06d MD |
787 | * Returning a -EPIPE return value means we could not send the metadata, |
788 | * but it can be caused by recoverable errors (e.g. the application has | |
789 | * terminated concurrently). | |
d88aee68 | 790 | */ |
7972aab2 DG |
791 | static int push_metadata(struct ust_registry_session *registry, |
792 | struct consumer_output *consumer) | |
d88aee68 | 793 | { |
331744e3 JD |
794 | int ret_val; |
795 | ssize_t ret; | |
d88aee68 DG |
796 | struct consumer_socket *socket; |
797 | ||
7972aab2 DG |
798 | assert(registry); |
799 | assert(consumer); | |
800 | ||
ce34fcd0 | 801 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 802 | if (registry->metadata_closed) { |
dc2bbdae MD |
803 | ret_val = -EPIPE; |
804 | goto error; | |
d88aee68 DG |
805 | } |
806 | ||
d88aee68 | 807 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
808 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
809 | consumer); | |
d88aee68 | 810 | if (!socket) { |
331744e3 | 811 | ret_val = -1; |
ce34fcd0 | 812 | goto error; |
d88aee68 DG |
813 | } |
814 | ||
331744e3 | 815 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 816 | if (ret < 0) { |
331744e3 | 817 | ret_val = ret; |
ce34fcd0 | 818 | goto error; |
d88aee68 | 819 | } |
dc2bbdae | 820 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
821 | return 0; |
822 | ||
ce34fcd0 | 823 | error: |
dc2bbdae | 824 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 825 | return ret_val; |
d88aee68 DG |
826 | } |
827 | ||
828 | /* | |
829 | * Send to the consumer a close metadata command for the given session. Once | |
830 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 831 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
832 | * in the destroy path. |
833 | * | |
a70ac2f4 MD |
834 | * Do not hold the registry lock while communicating with the consumerd, because |
835 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
836 | * the metadata request notification. | |
837 | * | |
d88aee68 DG |
838 | * Return 0 on success else a negative value. |
839 | */ | |
7972aab2 DG |
840 | static int close_metadata(struct ust_registry_session *registry, |
841 | struct consumer_output *consumer) | |
d88aee68 DG |
842 | { |
843 | int ret; | |
844 | struct consumer_socket *socket; | |
a70ac2f4 MD |
845 | uint64_t metadata_key; |
846 | bool registry_was_already_closed; | |
d88aee68 | 847 | |
7972aab2 DG |
848 | assert(registry); |
849 | assert(consumer); | |
d88aee68 | 850 | |
7972aab2 DG |
851 | rcu_read_lock(); |
852 | ||
ce34fcd0 | 853 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
854 | metadata_key = registry->metadata_key; |
855 | registry_was_already_closed = registry->metadata_closed; | |
856 | if (metadata_key != 0) { | |
857 | /* | |
858 | * Metadata closed. Even on error this means that the consumer | |
859 | * is not responding or not found so either way a second close | |
860 | * should NOT be emit for this registry. | |
861 | */ | |
862 | registry->metadata_closed = 1; | |
863 | } | |
864 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 865 | |
a70ac2f4 | 866 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 867 | ret = 0; |
1b532a60 | 868 | goto end; |
d88aee68 DG |
869 | } |
870 | ||
d88aee68 | 871 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
872 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
873 | consumer); | |
d88aee68 DG |
874 | if (!socket) { |
875 | ret = -1; | |
a70ac2f4 | 876 | goto end; |
d88aee68 DG |
877 | } |
878 | ||
a70ac2f4 | 879 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 880 | if (ret < 0) { |
a70ac2f4 | 881 | goto end; |
d88aee68 DG |
882 | } |
883 | ||
1b532a60 | 884 | end: |
7972aab2 | 885 | rcu_read_unlock(); |
d88aee68 DG |
886 | return ret; |
887 | } | |
888 | ||
36b588ed MD |
889 | /* |
890 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
891 | * section and outside of call_rcu thread, so we postpone its execution |
892 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
893 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
894 | */ |
895 | static | |
896 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
897 | { | |
898 | struct ust_app_session *ua_sess = | |
899 | caa_container_of(head, struct ust_app_session, rcu_head); | |
900 | ||
0b2dc8df | 901 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
902 | free(ua_sess); |
903 | } | |
904 | ||
d80a6244 DG |
905 | /* |
906 | * Delete ust app session safely. RCU read lock must be held before calling | |
907 | * this function. | |
82cac6d2 JG |
908 | * |
909 | * The session list lock must be held by the caller. | |
d80a6244 | 910 | */ |
8b366481 | 911 | static |
d0b96690 DG |
912 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
913 | struct ust_app *app) | |
d80a6244 DG |
914 | { |
915 | int ret; | |
bec39940 | 916 | struct lttng_ht_iter iter; |
d80a6244 | 917 | struct ust_app_channel *ua_chan; |
7972aab2 | 918 | struct ust_registry_session *registry; |
d80a6244 | 919 | |
d88aee68 DG |
920 | assert(ua_sess); |
921 | ||
1b532a60 DG |
922 | pthread_mutex_lock(&ua_sess->lock); |
923 | ||
b161602a MD |
924 | assert(!ua_sess->deleted); |
925 | ua_sess->deleted = true; | |
926 | ||
7972aab2 | 927 | registry = get_session_registry(ua_sess); |
fad1ed2f | 928 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 929 | if (registry) { |
d88aee68 | 930 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 931 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 932 | |
7972aab2 DG |
933 | /* |
934 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
935 | * metadata only on destroy trace session in this case. Also, the |
936 | * previous push metadata could have flag the metadata registry to | |
937 | * close so don't send a close command if closed. | |
7972aab2 | 938 | */ |
ce34fcd0 | 939 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
940 | /* And ask to close it for this session registry. */ |
941 | (void) close_metadata(registry, ua_sess->consumer); | |
942 | } | |
d80a6244 DG |
943 | } |
944 | ||
bec39940 DG |
945 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
946 | node.node) { | |
947 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 948 | assert(!ret); |
d0b96690 | 949 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 950 | } |
d80a6244 | 951 | |
7972aab2 DG |
952 | /* In case of per PID, the registry is kept in the session. */ |
953 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
954 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
955 | if (reg_pid) { | |
fad1ed2f JR |
956 | /* |
957 | * Registry can be null on error path during | |
958 | * initialization. | |
959 | */ | |
7972aab2 DG |
960 | buffer_reg_pid_remove(reg_pid); |
961 | buffer_reg_pid_destroy(reg_pid); | |
962 | } | |
963 | } | |
d0b96690 | 964 | |
aee6bafd | 965 | if (ua_sess->handle != -1) { |
fb45065e | 966 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 967 | ret = lttng_ust_ctl_release_handle(sock, ua_sess->handle); |
fb45065e | 968 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
969 | if (ret < 0) { |
970 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
971 | DBG3("UST app release session handle failed. Application is dead: pid = %d, sock = %d", | |
972 | app->pid, app->sock); | |
973 | } else if (ret == -EAGAIN) { | |
974 | WARN("UST app release session handle failed. Communication time out: pid = %d, sock = %d", | |
975 | app->pid, app->sock); | |
976 | } else { | |
977 | ERR("UST app release session handle failed with ret %d: pid = %d, sock = %d", | |
978 | ret, app->pid, app->sock); | |
979 | } | |
ffe60014 | 980 | } |
569744c5 | 981 | |
10b56aef MD |
982 | /* Remove session from application UST object descriptor. */ |
983 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
984 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
985 | assert(!ret); | |
aee6bafd | 986 | } |
10b56aef | 987 | |
1b532a60 DG |
988 | pthread_mutex_unlock(&ua_sess->lock); |
989 | ||
6addfa37 MD |
990 | consumer_output_put(ua_sess->consumer); |
991 | ||
36b588ed | 992 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 993 | } |
91d76f53 DG |
994 | |
995 | /* | |
284d8f55 DG |
996 | * Delete a traceable application structure from the global list. Never call |
997 | * this function outside of a call_rcu call. | |
36b588ed MD |
998 | * |
999 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 1000 | */ |
8b366481 DG |
1001 | static |
1002 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 1003 | { |
8b366481 | 1004 | int ret, sock; |
d42f20df | 1005 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
993578ff JR |
1006 | struct lttng_ht_iter iter; |
1007 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5e2abfaf | 1008 | bool event_notifier_write_fd_is_open; |
44d3bd01 | 1009 | |
82cac6d2 JG |
1010 | /* |
1011 | * The session list lock must be held during this function to guarantee | |
1012 | * the existence of ua_sess. | |
1013 | */ | |
1014 | session_lock_list(); | |
d80a6244 | 1015 | /* Delete ust app sessions info */ |
852d0037 DG |
1016 | sock = app->sock; |
1017 | app->sock = -1; | |
d80a6244 | 1018 | |
8b366481 | 1019 | /* Wipe sessions */ |
d42f20df DG |
1020 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
1021 | teardown_node) { | |
1022 | /* Free every object in the session and the session. */ | |
36b588ed | 1023 | rcu_read_lock(); |
d0b96690 | 1024 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 1025 | rcu_read_unlock(); |
d80a6244 | 1026 | } |
36b588ed | 1027 | |
993578ff JR |
1028 | /* Remove the event notifier rules associated with this app. */ |
1029 | rcu_read_lock(); | |
1030 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
1031 | &iter.iter, event_notifier_rule, node.node) { | |
1032 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, &iter); | |
1033 | assert(!ret); | |
1034 | ||
1035 | delete_ust_app_event_notifier_rule( | |
1036 | app->sock, event_notifier_rule, app); | |
1037 | } | |
1038 | ||
1039 | rcu_read_unlock(); | |
1040 | ||
0b2dc8df | 1041 | ht_cleanup_push(app->sessions); |
10b56aef | 1042 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 1043 | ht_cleanup_push(app->ust_objd); |
993578ff | 1044 | ht_cleanup_push(app->token_to_event_notifier_rule_ht); |
d80a6244 | 1045 | |
da873412 JR |
1046 | /* |
1047 | * This could be NULL if the event notifier setup failed (e.g the app | |
1048 | * was killed or the tracer does not support this feature). | |
1049 | */ | |
1050 | if (app->event_notifier_group.object) { | |
1051 | enum lttng_error_code ret_code; | |
533a90fb FD |
1052 | enum event_notifier_error_accounting_status status; |
1053 | ||
da873412 JR |
1054 | const int event_notifier_read_fd = lttng_pipe_get_readfd( |
1055 | app->event_notifier_group.event_pipe); | |
1056 | ||
1057 | ret_code = notification_thread_command_remove_tracer_event_source( | |
412d7227 | 1058 | the_notification_thread_handle, |
da873412 JR |
1059 | event_notifier_read_fd); |
1060 | if (ret_code != LTTNG_OK) { | |
1061 | ERR("Failed to remove application tracer event source from notification thread"); | |
1062 | } | |
1063 | ||
533a90fb FD |
1064 | status = event_notifier_error_accounting_unregister_app(app); |
1065 | if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
1066 | ERR("Error unregistering app from event notifier error accounting"); | |
1067 | } | |
1068 | ||
b623cb6a | 1069 | lttng_ust_ctl_release_object(sock, app->event_notifier_group.object); |
da873412 JR |
1070 | free(app->event_notifier_group.object); |
1071 | } | |
1072 | ||
5e2abfaf JG |
1073 | event_notifier_write_fd_is_open = lttng_pipe_is_write_open( |
1074 | app->event_notifier_group.event_pipe); | |
da873412 | 1075 | lttng_pipe_destroy(app->event_notifier_group.event_pipe); |
5e2abfaf JG |
1076 | /* |
1077 | * Release the file descriptors reserved for the event notifier pipe. | |
1078 | * The app could be destroyed before the write end of the pipe could be | |
1079 | * passed to the application (and closed). In that case, both file | |
1080 | * descriptors must be released. | |
1081 | */ | |
1082 | lttng_fd_put(LTTNG_FD_APPS, event_notifier_write_fd_is_open ? 2 : 1); | |
da873412 | 1083 | |
6414a713 | 1084 | /* |
852d0037 DG |
1085 | * Wait until we have deleted the application from the sock hash table |
1086 | * before closing this socket, otherwise an application could re-use the | |
1087 | * socket ID and race with the teardown, using the same hash table entry. | |
1088 | * | |
1089 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
1090 | * all RCU readers that could run concurrently with unregister app, | |
1091 | * therefore we _need_ to only close that socket after a grace period. So | |
1092 | * it should stay in this RCU callback. | |
1093 | * | |
1094 | * This close() is a very important step of the synchronization model so | |
1095 | * every modification to this function must be carefully reviewed. | |
6414a713 | 1096 | */ |
799e2c4f MD |
1097 | ret = close(sock); |
1098 | if (ret) { | |
1099 | PERROR("close"); | |
1100 | } | |
4063050c | 1101 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 1102 | |
852d0037 | 1103 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 1104 | free(app); |
82cac6d2 | 1105 | session_unlock_list(); |
099e26bd DG |
1106 | } |
1107 | ||
1108 | /* | |
f6a9efaa | 1109 | * URCU intermediate call to delete an UST app. |
099e26bd | 1110 | */ |
8b366481 DG |
1111 | static |
1112 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 1113 | { |
bec39940 DG |
1114 | struct lttng_ht_node_ulong *node = |
1115 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 1116 | struct ust_app *app = |
852d0037 | 1117 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 1118 | |
852d0037 | 1119 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 1120 | delete_ust_app(app); |
099e26bd DG |
1121 | } |
1122 | ||
ffe60014 DG |
1123 | /* |
1124 | * Delete the session from the application ht and delete the data structure by | |
1125 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
1126 | * |
1127 | * The session list lock must be held by the caller. | |
ffe60014 | 1128 | */ |
d0b96690 | 1129 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
1130 | struct ust_app_session *ua_sess) |
1131 | { | |
1132 | int ret; | |
1133 | struct lttng_ht_iter iter; | |
1134 | ||
1135 | assert(app); | |
1136 | assert(ua_sess); | |
1137 | ||
1138 | iter.iter.node = &ua_sess->node.node; | |
1139 | ret = lttng_ht_del(app->sessions, &iter); | |
1140 | if (ret) { | |
1141 | /* Already scheduled for teardown. */ | |
1142 | goto end; | |
1143 | } | |
1144 | ||
1145 | /* Once deleted, free the data structure. */ | |
d0b96690 | 1146 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
1147 | |
1148 | end: | |
1149 | return; | |
1150 | } | |
1151 | ||
8b366481 DG |
1152 | /* |
1153 | * Alloc new UST app session. | |
1154 | */ | |
1155 | static | |
40bbd087 | 1156 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1157 | { |
1158 | struct ust_app_session *ua_sess; | |
1159 | ||
1160 | /* Init most of the default value by allocating and zeroing */ | |
1161 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
1162 | if (ua_sess == NULL) { | |
1163 | PERROR("malloc"); | |
ffe60014 | 1164 | goto error_free; |
8b366481 DG |
1165 | } |
1166 | ||
1167 | ua_sess->handle = -1; | |
bec39940 | 1168 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
fc4b93fa | 1169 | ua_sess->metadata_attr.type = LTTNG_UST_ABI_CHAN_METADATA; |
84ad93e8 | 1170 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1171 | |
8b366481 DG |
1172 | return ua_sess; |
1173 | ||
ffe60014 | 1174 | error_free: |
8b366481 DG |
1175 | return NULL; |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * Alloc new UST app channel. | |
1180 | */ | |
1181 | static | |
b53d4e59 | 1182 | struct ust_app_channel *alloc_ust_app_channel(const char *name, |
d0b96690 | 1183 | struct ust_app_session *ua_sess, |
fc4b93fa | 1184 | struct lttng_ust_abi_channel_attr *attr) |
8b366481 DG |
1185 | { |
1186 | struct ust_app_channel *ua_chan; | |
1187 | ||
1188 | /* Init most of the default value by allocating and zeroing */ | |
1189 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1190 | if (ua_chan == NULL) { | |
1191 | PERROR("malloc"); | |
1192 | goto error; | |
1193 | } | |
1194 | ||
1195 | /* Setup channel name */ | |
1196 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1197 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1198 | ||
1199 | ua_chan->enabled = 1; | |
1200 | ua_chan->handle = -1; | |
45893984 | 1201 | ua_chan->session = ua_sess; |
ffe60014 | 1202 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1203 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1204 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1205 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1206 | |
1207 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1208 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1209 | |
1210 | /* Copy attributes */ | |
1211 | if (attr) { | |
b623cb6a | 1212 | /* Translate from lttng_ust_channel to lttng_ust_ctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1213 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1214 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1215 | ua_chan->attr.overwrite = attr->overwrite; | |
1216 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1217 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1218 | ua_chan->attr.output = attr->output; | |
491d1539 | 1219 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1220 | } |
ffe60014 | 1221 | /* By default, the channel is a per cpu channel. */ |
fc4b93fa | 1222 | ua_chan->attr.type = LTTNG_UST_ABI_CHAN_PER_CPU; |
8b366481 DG |
1223 | |
1224 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1225 | ||
1226 | return ua_chan; | |
1227 | ||
1228 | error: | |
1229 | return NULL; | |
1230 | } | |
1231 | ||
37f1c236 DG |
1232 | /* |
1233 | * Allocate and initialize a UST app stream. | |
1234 | * | |
1235 | * Return newly allocated stream pointer or NULL on error. | |
1236 | */ | |
ffe60014 | 1237 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1238 | { |
1239 | struct ust_app_stream *stream = NULL; | |
1240 | ||
1241 | stream = zmalloc(sizeof(*stream)); | |
1242 | if (stream == NULL) { | |
1243 | PERROR("zmalloc ust app stream"); | |
1244 | goto error; | |
1245 | } | |
1246 | ||
1247 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1248 | stream->handle = -1; | |
1249 | ||
1250 | error: | |
1251 | return stream; | |
1252 | } | |
1253 | ||
8b366481 DG |
1254 | /* |
1255 | * Alloc new UST app event. | |
1256 | */ | |
1257 | static | |
1258 | struct ust_app_event *alloc_ust_app_event(char *name, | |
fc4b93fa | 1259 | struct lttng_ust_abi_event *attr) |
8b366481 DG |
1260 | { |
1261 | struct ust_app_event *ua_event; | |
1262 | ||
1263 | /* Init most of the default value by allocating and zeroing */ | |
1264 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1265 | if (ua_event == NULL) { | |
20533947 | 1266 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1267 | goto error; |
1268 | } | |
1269 | ||
1270 | ua_event->enabled = 1; | |
1271 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1272 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1273 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1274 | |
1275 | /* Copy attributes */ | |
1276 | if (attr) { | |
1277 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1278 | } | |
1279 | ||
1280 | DBG3("UST app event %s allocated", ua_event->name); | |
1281 | ||
1282 | return ua_event; | |
1283 | ||
1284 | error: | |
1285 | return NULL; | |
1286 | } | |
1287 | ||
993578ff JR |
1288 | /* |
1289 | * Allocate a new UST app event notifier rule. | |
1290 | */ | |
1291 | static struct ust_app_event_notifier_rule *alloc_ust_app_event_notifier_rule( | |
267d66aa | 1292 | struct lttng_trigger *trigger) |
993578ff JR |
1293 | { |
1294 | enum lttng_event_rule_generate_exclusions_status | |
1295 | generate_exclusion_status; | |
620b0c36 | 1296 | enum lttng_condition_status cond_status; |
993578ff | 1297 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; |
267d66aa JR |
1298 | struct lttng_condition *condition = NULL; |
1299 | const struct lttng_event_rule *event_rule = NULL; | |
993578ff JR |
1300 | |
1301 | ua_event_notifier_rule = zmalloc(sizeof(struct ust_app_event_notifier_rule)); | |
1302 | if (ua_event_notifier_rule == NULL) { | |
1303 | PERROR("Failed to allocate ust_app_event_notifier_rule structure"); | |
1304 | goto error; | |
1305 | } | |
1306 | ||
1307 | ua_event_notifier_rule->enabled = 1; | |
267d66aa JR |
1308 | ua_event_notifier_rule->token = lttng_trigger_get_tracer_token(trigger); |
1309 | lttng_ht_node_init_u64(&ua_event_notifier_rule->node, | |
1310 | ua_event_notifier_rule->token); | |
993578ff | 1311 | |
267d66aa JR |
1312 | condition = lttng_trigger_get_condition(trigger); |
1313 | assert(condition); | |
8dbb86b8 JR |
1314 | assert(lttng_condition_get_type(condition) == |
1315 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); | |
267d66aa | 1316 | |
620b0c36 FD |
1317 | cond_status = lttng_condition_event_rule_matches_get_rule( |
1318 | condition, &event_rule); | |
1319 | assert(cond_status == LTTNG_CONDITION_STATUS_OK); | |
267d66aa | 1320 | assert(event_rule); |
993578ff | 1321 | |
46e9a5fb | 1322 | ua_event_notifier_rule->error_counter_index = |
8dbb86b8 | 1323 | lttng_condition_event_rule_matches_get_error_counter_index(condition); |
267d66aa JR |
1324 | /* Acquire the event notifier's reference to the trigger. */ |
1325 | lttng_trigger_get(trigger); | |
1326 | ||
1327 | ua_event_notifier_rule->trigger = trigger; | |
993578ff JR |
1328 | ua_event_notifier_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule); |
1329 | generate_exclusion_status = lttng_event_rule_generate_exclusions( | |
1330 | event_rule, &ua_event_notifier_rule->exclusion); | |
1331 | switch (generate_exclusion_status) { | |
1332 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK: | |
1333 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE: | |
1334 | break; | |
1335 | default: | |
1a299778 | 1336 | /* Error occurred. */ |
267d66aa JR |
1337 | ERR("Failed to generate exclusions from trigger while allocating an event notifier rule"); |
1338 | goto error_put_trigger; | |
993578ff JR |
1339 | } |
1340 | ||
1341 | DBG3("UST app event notifier rule allocated: token = %" PRIu64, | |
1342 | ua_event_notifier_rule->token); | |
1343 | ||
1344 | return ua_event_notifier_rule; | |
1345 | ||
267d66aa JR |
1346 | error_put_trigger: |
1347 | lttng_trigger_put(trigger); | |
993578ff JR |
1348 | error: |
1349 | free(ua_event_notifier_rule); | |
1350 | return NULL; | |
1351 | } | |
1352 | ||
8b366481 DG |
1353 | /* |
1354 | * Alloc new UST app context. | |
1355 | */ | |
1356 | static | |
bdf64013 | 1357 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1358 | { |
1359 | struct ust_app_ctx *ua_ctx; | |
1360 | ||
1361 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1362 | if (ua_ctx == NULL) { | |
1363 | goto error; | |
1364 | } | |
1365 | ||
31746f93 DG |
1366 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1367 | ||
8b366481 DG |
1368 | if (uctx) { |
1369 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
fc4b93fa | 1370 | if (uctx->ctx == LTTNG_UST_ABI_CONTEXT_APP_CONTEXT) { |
f3db82be | 1371 | char *provider_name = NULL, *ctx_name = NULL; |
bdf64013 JG |
1372 | |
1373 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1374 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1375 | if (!provider_name || !ctx_name) { | |
1376 | free(provider_name); | |
1377 | free(ctx_name); | |
1378 | goto error; | |
1379 | } | |
1380 | ||
1381 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1382 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1383 | } | |
8b366481 DG |
1384 | } |
1385 | ||
1386 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1387 | return ua_ctx; |
bdf64013 JG |
1388 | error: |
1389 | free(ua_ctx); | |
1390 | return NULL; | |
8b366481 DG |
1391 | } |
1392 | ||
51755dc8 JG |
1393 | /* |
1394 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1395 | * | |
1396 | * Return allocated filter or NULL on error. | |
1397 | */ | |
fc4b93fa MD |
1398 | static struct lttng_ust_abi_filter_bytecode *create_ust_filter_bytecode_from_bytecode( |
1399 | const struct lttng_bytecode *orig_f) | |
51755dc8 | 1400 | { |
fc4b93fa | 1401 | struct lttng_ust_abi_filter_bytecode *filter = NULL; |
51755dc8 | 1402 | |
f2eafd2d | 1403 | /* Copy filter bytecode. */ |
51755dc8 JG |
1404 | filter = zmalloc(sizeof(*filter) + orig_f->len); |
1405 | if (!filter) { | |
f2eafd2d | 1406 | PERROR("Failed to allocate lttng_ust_filter_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); |
51755dc8 JG |
1407 | goto error; |
1408 | } | |
1409 | ||
2b00d462 | 1410 | assert(sizeof(struct lttng_bytecode) == |
fc4b93fa | 1411 | sizeof(struct lttng_ust_abi_filter_bytecode)); |
51755dc8 JG |
1412 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); |
1413 | error: | |
1414 | return filter; | |
1415 | } | |
1416 | ||
f2eafd2d JR |
1417 | /* |
1418 | * Create a liblttng-ust capture bytecode from given bytecode. | |
1419 | * | |
1420 | * Return allocated filter or NULL on error. | |
1421 | */ | |
fc4b93fa | 1422 | static struct lttng_ust_abi_capture_bytecode * |
f2eafd2d JR |
1423 | create_ust_capture_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) |
1424 | { | |
fc4b93fa | 1425 | struct lttng_ust_abi_capture_bytecode *capture = NULL; |
f2eafd2d JR |
1426 | |
1427 | /* Copy capture bytecode. */ | |
1428 | capture = zmalloc(sizeof(*capture) + orig_f->len); | |
1429 | if (!capture) { | |
fc4b93fa | 1430 | PERROR("Failed to allocate lttng_ust_abi_capture_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); |
f2eafd2d JR |
1431 | goto error; |
1432 | } | |
1433 | ||
1434 | assert(sizeof(struct lttng_bytecode) == | |
fc4b93fa | 1435 | sizeof(struct lttng_ust_abi_capture_bytecode)); |
f2eafd2d JR |
1436 | memcpy(capture, orig_f, sizeof(*capture) + orig_f->len); |
1437 | error: | |
1438 | return capture; | |
1439 | } | |
1440 | ||
099e26bd | 1441 | /* |
421cb601 DG |
1442 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1443 | * held before calling this helper function. | |
099e26bd | 1444 | */ |
f20baf8e | 1445 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1446 | { |
bec39940 | 1447 | struct lttng_ht_node_ulong *node; |
bec39940 | 1448 | struct lttng_ht_iter iter; |
f6a9efaa | 1449 | |
852d0037 | 1450 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1451 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1452 | if (node == NULL) { |
1453 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1454 | goto error; |
1455 | } | |
852d0037 DG |
1456 | |
1457 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1458 | |
1459 | error: | |
1460 | return NULL; | |
099e26bd DG |
1461 | } |
1462 | ||
d0b96690 DG |
1463 | /* |
1464 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1465 | * be held before calling this helper function. | |
1466 | */ | |
1467 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1468 | { | |
1469 | struct lttng_ht_node_ulong *node; | |
1470 | struct lttng_ht_iter iter; | |
1471 | ||
1472 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1473 | &iter); | |
1474 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1475 | if (node == NULL) { | |
1476 | DBG2("UST app find by notify sock %d not found", sock); | |
1477 | goto error; | |
1478 | } | |
1479 | ||
1480 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1481 | ||
1482 | error: | |
1483 | return NULL; | |
1484 | } | |
1485 | ||
025faf73 DG |
1486 | /* |
1487 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1488 | * event loglevel. | |
1489 | * | |
1490 | * Return an ust_app_event object or NULL on error. | |
1491 | */ | |
18eace3b | 1492 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1083b49a JG |
1493 | const char *name, |
1494 | const struct lttng_bytecode *filter, | |
1495 | enum lttng_ust_abi_loglevel_type loglevel_type, | |
2106efa0 | 1496 | int loglevel_value, |
39c5a3a7 | 1497 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1498 | { |
1499 | struct lttng_ht_iter iter; | |
1500 | struct lttng_ht_node_str *node; | |
1501 | struct ust_app_event *event = NULL; | |
1502 | struct ust_app_ht_key key; | |
18eace3b DG |
1503 | |
1504 | assert(name); | |
1505 | assert(ht); | |
1506 | ||
1507 | /* Setup key for event lookup. */ | |
1508 | key.name = name; | |
1509 | key.filter = filter; | |
1083b49a JG |
1510 | key.loglevel_type = loglevel_type; |
1511 | key.loglevel_value = loglevel_value; | |
39c5a3a7 | 1512 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1513 | key.exclusion = exclusion; |
18eace3b | 1514 | |
025faf73 DG |
1515 | /* Lookup using the event name as hash and a custom match fct. */ |
1516 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1517 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1518 | node = lttng_ht_iter_get_node_str(&iter); |
1519 | if (node == NULL) { | |
1520 | goto end; | |
1521 | } | |
1522 | ||
1523 | event = caa_container_of(node, struct ust_app_event, node); | |
1524 | ||
1525 | end: | |
18eace3b DG |
1526 | return event; |
1527 | } | |
1528 | ||
993578ff JR |
1529 | /* |
1530 | * Look-up an event notifier rule based on its token id. | |
1531 | * | |
1532 | * Must be called with the RCU read lock held. | |
1533 | * Return an ust_app_event_notifier_rule object or NULL on error. | |
1534 | */ | |
1535 | static struct ust_app_event_notifier_rule *find_ust_app_event_notifier_rule( | |
1536 | struct lttng_ht *ht, uint64_t token) | |
1537 | { | |
1538 | struct lttng_ht_iter iter; | |
1539 | struct lttng_ht_node_u64 *node; | |
1540 | struct ust_app_event_notifier_rule *event_notifier_rule = NULL; | |
1541 | ||
1542 | assert(ht); | |
1543 | ||
1544 | lttng_ht_lookup(ht, &token, &iter); | |
1545 | node = lttng_ht_iter_get_node_u64(&iter); | |
1546 | if (node == NULL) { | |
1547 | DBG2("UST app event notifier rule token not found: token = %" PRIu64, | |
1548 | token); | |
1549 | goto end; | |
1550 | } | |
1551 | ||
1552 | event_notifier_rule = caa_container_of( | |
1553 | node, struct ust_app_event_notifier_rule, node); | |
1554 | end: | |
1555 | return event_notifier_rule; | |
1556 | } | |
1557 | ||
55cc08a6 DG |
1558 | /* |
1559 | * Create the channel context on the tracer. | |
d0b96690 DG |
1560 | * |
1561 | * Called with UST app session lock held. | |
55cc08a6 DG |
1562 | */ |
1563 | static | |
1564 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1565 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1566 | { | |
1567 | int ret; | |
1568 | ||
840cb59c | 1569 | health_code_update(); |
86acf0da | 1570 | |
fb45065e | 1571 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1572 | ret = lttng_ust_ctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1573 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1574 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1575 | if (ret < 0) { |
569744c5 | 1576 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3757b385 | 1577 | ret = 0; |
569744c5 JR |
1578 | DBG3("UST app create channel context failed. Application is dead: pid = %d, sock = %d", |
1579 | app->pid, app->sock); | |
1580 | } else if (ret == -EAGAIN) { | |
1581 | ret = 0; | |
1582 | WARN("UST app create channel context failed. Communication time out: pid = %d, sock = %d", | |
1583 | app->pid, app->sock); | |
1584 | } else { | |
1585 | ERR("UST app create channel context failed with ret %d: pid = %d, sock = %d", | |
1586 | ret, app->pid, app->sock); | |
ffe60014 | 1587 | } |
55cc08a6 DG |
1588 | goto error; |
1589 | } | |
1590 | ||
1591 | ua_ctx->handle = ua_ctx->obj->handle; | |
1592 | ||
d0b96690 DG |
1593 | DBG2("UST app context handle %d created successfully for channel %s", |
1594 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1595 | |
1596 | error: | |
840cb59c | 1597 | health_code_update(); |
55cc08a6 DG |
1598 | return ret; |
1599 | } | |
1600 | ||
53a80697 MD |
1601 | /* |
1602 | * Set the filter on the tracer. | |
1603 | */ | |
a154c7b8 | 1604 | static int set_ust_object_filter(struct ust_app *app, |
2b00d462 | 1605 | const struct lttng_bytecode *bytecode, |
fc4b93fa | 1606 | struct lttng_ust_abi_object_data *ust_object) |
53a80697 MD |
1607 | { |
1608 | int ret; | |
fc4b93fa | 1609 | struct lttng_ust_abi_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1610 | |
840cb59c | 1611 | health_code_update(); |
86acf0da | 1612 | |
f2eafd2d | 1613 | ust_bytecode = create_ust_filter_bytecode_from_bytecode(bytecode); |
51755dc8 JG |
1614 | if (!ust_bytecode) { |
1615 | ret = -LTTNG_ERR_NOMEM; | |
1616 | goto error; | |
1617 | } | |
fb45065e | 1618 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1619 | ret = lttng_ust_ctl_set_filter(app->sock, ust_bytecode, |
a154c7b8 | 1620 | ust_object); |
fb45065e | 1621 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1622 | if (ret < 0) { |
569744c5 JR |
1623 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1624 | ret = 0; | |
1625 | DBG3("UST app set filter failed. Application is dead: pid = %d, sock = %d", | |
1626 | app->pid, app->sock); | |
1627 | } else if (ret == -EAGAIN) { | |
3757b385 | 1628 | ret = 0; |
569744c5 JR |
1629 | WARN("UST app set filter failed. Communication time out: pid = %d, sock = %d", |
1630 | app->pid, app->sock); | |
1631 | } else { | |
1632 | ERR("UST app set filter failed with ret %d: pid = %d, sock = %d, object = %p", | |
1633 | ret, app->pid, app->sock, ust_object); | |
ffe60014 | 1634 | } |
53a80697 MD |
1635 | goto error; |
1636 | } | |
1637 | ||
f2eafd2d JR |
1638 | DBG2("UST filter successfully set: object = %p", ust_object); |
1639 | ||
1640 | error: | |
1641 | health_code_update(); | |
1642 | free(ust_bytecode); | |
1643 | return ret; | |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * Set a capture bytecode for the passed object. | |
11f6ce94 JR |
1648 | * The sequence number enforces the ordering at runtime and on reception of |
1649 | * the captured payloads. | |
f2eafd2d JR |
1650 | */ |
1651 | static int set_ust_capture(struct ust_app *app, | |
1652 | const struct lttng_bytecode *bytecode, | |
11f6ce94 | 1653 | unsigned int capture_seqnum, |
3d1384a4 | 1654 | struct lttng_ust_abi_object_data *ust_object) |
f2eafd2d JR |
1655 | { |
1656 | int ret; | |
fc4b93fa | 1657 | struct lttng_ust_abi_capture_bytecode *ust_bytecode = NULL; |
f2eafd2d JR |
1658 | |
1659 | health_code_update(); | |
1660 | ||
1661 | ust_bytecode = create_ust_capture_bytecode_from_bytecode(bytecode); | |
1662 | if (!ust_bytecode) { | |
1663 | ret = -LTTNG_ERR_NOMEM; | |
1664 | goto error; | |
1665 | } | |
1666 | ||
11f6ce94 JR |
1667 | /* |
1668 | * Set the sequence number to ensure the capture of fields is ordered. | |
1669 | */ | |
1670 | ust_bytecode->seqnum = capture_seqnum; | |
1671 | ||
f2eafd2d | 1672 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1673 | ret = lttng_ust_ctl_set_capture(app->sock, ust_bytecode, |
f2eafd2d JR |
1674 | ust_object); |
1675 | pthread_mutex_unlock(&app->sock_lock); | |
1676 | if (ret < 0) { | |
569744c5 | 1677 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
f2eafd2d | 1678 | ret = 0; |
569744c5 JR |
1679 | DBG3("UST app set capture failed. Application is dead: pid = %d, sock = %d", |
1680 | app->pid, app->sock); | |
1681 | } else if (ret == -EAGAIN) { | |
1682 | ret = 0; | |
1683 | DBG3("UST app set capture failed. Communication timeout: pid = %d, sock = %d", | |
1684 | app->pid, app->sock); | |
1685 | } else { | |
1686 | ERR("UST app event set capture failed with ret %d: pid = %d, sock = %d", | |
1687 | ret, app->pid, | |
1688 | app->sock); | |
f2eafd2d JR |
1689 | } |
1690 | ||
1691 | goto error; | |
1692 | } | |
1693 | ||
1694 | DBG2("UST capture successfully set: object = %p", ust_object); | |
53a80697 MD |
1695 | |
1696 | error: | |
840cb59c | 1697 | health_code_update(); |
51755dc8 | 1698 | free(ust_bytecode); |
53a80697 MD |
1699 | return ret; |
1700 | } | |
1701 | ||
51755dc8 | 1702 | static |
fc4b93fa | 1703 | struct lttng_ust_abi_event_exclusion *create_ust_exclusion_from_exclusion( |
c0901ffa | 1704 | const struct lttng_event_exclusion *exclusion) |
51755dc8 | 1705 | { |
fc4b93fa MD |
1706 | struct lttng_ust_abi_event_exclusion *ust_exclusion = NULL; |
1707 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_abi_event_exclusion) + | |
1708 | LTTNG_UST_ABI_SYM_NAME_LEN * exclusion->count; | |
51755dc8 JG |
1709 | |
1710 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1711 | if (!ust_exclusion) { | |
1712 | PERROR("malloc"); | |
1713 | goto end; | |
1714 | } | |
1715 | ||
1716 | assert(sizeof(struct lttng_event_exclusion) == | |
fc4b93fa | 1717 | sizeof(struct lttng_ust_abi_event_exclusion)); |
51755dc8 JG |
1718 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); |
1719 | end: | |
1720 | return ust_exclusion; | |
1721 | } | |
1722 | ||
7cc9a73c JI |
1723 | /* |
1724 | * Set event exclusions on the tracer. | |
1725 | */ | |
c0901ffa JR |
1726 | static int set_ust_object_exclusions(struct ust_app *app, |
1727 | const struct lttng_event_exclusion *exclusions, | |
fc4b93fa | 1728 | struct lttng_ust_abi_object_data *ust_object) |
7cc9a73c JI |
1729 | { |
1730 | int ret; | |
fc4b93fa | 1731 | struct lttng_ust_abi_event_exclusion *ust_exclusions = NULL; |
7cc9a73c | 1732 | |
c0901ffa | 1733 | assert(exclusions && exclusions->count > 0); |
7cc9a73c | 1734 | |
c0901ffa | 1735 | health_code_update(); |
7cc9a73c | 1736 | |
c0901ffa JR |
1737 | ust_exclusions = create_ust_exclusion_from_exclusion( |
1738 | exclusions); | |
1739 | if (!ust_exclusions) { | |
51755dc8 JG |
1740 | ret = -LTTNG_ERR_NOMEM; |
1741 | goto error; | |
1742 | } | |
fb45065e | 1743 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1744 | ret = lttng_ust_ctl_set_exclusion(app->sock, ust_exclusions, ust_object); |
fb45065e | 1745 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c | 1746 | if (ret < 0) { |
569744c5 | 1747 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
7cc9a73c | 1748 | ret = 0; |
569744c5 JR |
1749 | DBG3("UST app event exclusion failed. Application is dead: pid = %d, sock = %d", |
1750 | app->pid, app->sock); | |
1751 | } else if (ret == -EAGAIN) { | |
1752 | ret = 0; | |
1753 | WARN("UST app event exclusion failed. Communication time out(pid: %d, sock = %d", | |
1754 | app->pid, app->sock); | |
1755 | } else { | |
1756 | ERR("UST app event exclusions failed with ret %d: pid = %d, sock = %d, object = %p", | |
1757 | ret, app->pid, app->sock, ust_object); | |
7cc9a73c JI |
1758 | } |
1759 | goto error; | |
1760 | } | |
1761 | ||
c0901ffa | 1762 | DBG2("UST exclusions set successfully for object %p", ust_object); |
7cc9a73c JI |
1763 | |
1764 | error: | |
1765 | health_code_update(); | |
c0901ffa | 1766 | free(ust_exclusions); |
7cc9a73c JI |
1767 | return ret; |
1768 | } | |
1769 | ||
9730260e DG |
1770 | /* |
1771 | * Disable the specified event on to UST tracer for the UST session. | |
1772 | */ | |
e2456d0a | 1773 | static int disable_ust_object(struct ust_app *app, |
fc4b93fa | 1774 | struct lttng_ust_abi_object_data *object) |
9730260e DG |
1775 | { |
1776 | int ret; | |
1777 | ||
840cb59c | 1778 | health_code_update(); |
86acf0da | 1779 | |
fb45065e | 1780 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1781 | ret = lttng_ust_ctl_disable(app->sock, object); |
fb45065e | 1782 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1783 | if (ret < 0) { |
569744c5 JR |
1784 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1785 | ret = 0; | |
1786 | DBG3("UST app disable object failed. Application is dead: pid = %d, sock = %d", | |
1787 | app->pid, app->sock); | |
1788 | } else if (ret == -EAGAIN) { | |
3757b385 | 1789 | ret = 0; |
569744c5 JR |
1790 | WARN("UST app disable object failed. Communication time out: pid = %d, sock = %d", |
1791 | app->pid, app->sock); | |
1792 | } else { | |
1793 | ERR("UST app disable object failed with ret %d: pid = %d, sock = %d, object = %p", | |
1794 | ret, app->pid, app->sock, object); | |
ffe60014 | 1795 | } |
9730260e DG |
1796 | goto error; |
1797 | } | |
1798 | ||
569744c5 | 1799 | DBG2("UST app object %p disabled successfully for app: pid = %d", |
e2456d0a | 1800 | object, app->pid); |
9730260e DG |
1801 | |
1802 | error: | |
840cb59c | 1803 | health_code_update(); |
9730260e DG |
1804 | return ret; |
1805 | } | |
1806 | ||
78f0bacd DG |
1807 | /* |
1808 | * Disable the specified channel on to UST tracer for the UST session. | |
1809 | */ | |
1810 | static int disable_ust_channel(struct ust_app *app, | |
1811 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1812 | { | |
1813 | int ret; | |
1814 | ||
840cb59c | 1815 | health_code_update(); |
86acf0da | 1816 | |
fb45065e | 1817 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1818 | ret = lttng_ust_ctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1819 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1820 | if (ret < 0) { |
569744c5 | 1821 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3757b385 | 1822 | ret = 0; |
569744c5 JR |
1823 | DBG3("UST app disable channel failed. Application is dead: pid = %d, sock = %d", |
1824 | app->pid, app->sock); | |
1825 | } else if (ret == -EAGAIN) { | |
1826 | ret = 0; | |
1827 | WARN("UST app disable channel failed. Communication time out: pid = %d, sock = %d", | |
1828 | app->pid, app->sock); | |
1829 | } else { | |
1830 | ERR("UST app channel %s disable failed, session handle %d, with ret %d: pid = %d, sock = %d", | |
1831 | ua_chan->name, ua_sess->handle, ret, | |
1832 | app->pid, app->sock); | |
ffe60014 | 1833 | } |
78f0bacd DG |
1834 | goto error; |
1835 | } | |
1836 | ||
569744c5 | 1837 | DBG2("UST app channel %s disabled successfully for app: pid = %d", |
852d0037 | 1838 | ua_chan->name, app->pid); |
78f0bacd DG |
1839 | |
1840 | error: | |
840cb59c | 1841 | health_code_update(); |
78f0bacd DG |
1842 | return ret; |
1843 | } | |
1844 | ||
1845 | /* | |
1846 | * Enable the specified channel on to UST tracer for the UST session. | |
1847 | */ | |
1848 | static int enable_ust_channel(struct ust_app *app, | |
1849 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1850 | { | |
1851 | int ret; | |
1852 | ||
840cb59c | 1853 | health_code_update(); |
86acf0da | 1854 | |
fb45065e | 1855 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1856 | ret = lttng_ust_ctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1857 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1858 | if (ret < 0) { |
569744c5 | 1859 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3757b385 | 1860 | ret = 0; |
569744c5 JR |
1861 | DBG3("UST app channel %s enable failed. Application is dead: pid = %d, sock = %d", |
1862 | ua_chan->name, app->pid, app->sock); | |
1863 | } else if (ret == -EAGAIN) { | |
1864 | ret = 0; | |
1865 | WARN("UST app channel %s enable failed. Communication time out: pid = %d, sock = %d", | |
1866 | ua_chan->name, app->pid, app->sock); | |
1867 | } else { | |
1868 | ERR("UST app channel %s enable failed, session handle %d, with ret %d: pid = %d, sock = %d", | |
1869 | ua_chan->name, ua_sess->handle, ret, | |
1870 | app->pid, app->sock); | |
ffe60014 | 1871 | } |
78f0bacd DG |
1872 | goto error; |
1873 | } | |
1874 | ||
1875 | ua_chan->enabled = 1; | |
1876 | ||
569744c5 | 1877 | DBG2("UST app channel %s enabled successfully for app: pid = %d", |
852d0037 | 1878 | ua_chan->name, app->pid); |
78f0bacd DG |
1879 | |
1880 | error: | |
840cb59c | 1881 | health_code_update(); |
78f0bacd DG |
1882 | return ret; |
1883 | } | |
1884 | ||
edb67388 DG |
1885 | /* |
1886 | * Enable the specified event on to UST tracer for the UST session. | |
1887 | */ | |
3428a1b7 | 1888 | static int enable_ust_object( |
fc4b93fa | 1889 | struct ust_app *app, struct lttng_ust_abi_object_data *ust_object) |
edb67388 DG |
1890 | { |
1891 | int ret; | |
1892 | ||
840cb59c | 1893 | health_code_update(); |
86acf0da | 1894 | |
fb45065e | 1895 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 1896 | ret = lttng_ust_ctl_enable(app->sock, ust_object); |
fb45065e | 1897 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1898 | if (ret < 0) { |
569744c5 JR |
1899 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1900 | ret = 0; | |
1901 | DBG3("UST app enable object failed. Application is dead: pid = %d, sock = %d", | |
1902 | app->pid, app->sock); | |
1903 | } else if (ret == -EAGAIN) { | |
3757b385 | 1904 | ret = 0; |
569744c5 JR |
1905 | WARN("UST app enable object failed. Communication time out: pid = %d, sock = %d", |
1906 | app->pid, app->sock); | |
1907 | } else { | |
1908 | ERR("UST app enable object failed with ret %d: pid = %d, sock = %d, object = %p", | |
1909 | ret, app->pid, app->sock, ust_object); | |
ffe60014 | 1910 | } |
edb67388 DG |
1911 | goto error; |
1912 | } | |
1913 | ||
569744c5 | 1914 | DBG2("UST app object %p enabled successfully for app: pid = %d", |
3428a1b7 | 1915 | ust_object, app->pid); |
edb67388 DG |
1916 | |
1917 | error: | |
840cb59c | 1918 | health_code_update(); |
edb67388 DG |
1919 | return ret; |
1920 | } | |
1921 | ||
099e26bd | 1922 | /* |
7972aab2 | 1923 | * Send channel and stream buffer to application. |
4f3ab6ee | 1924 | * |
ffe60014 | 1925 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1926 | */ |
7972aab2 DG |
1927 | static int send_channel_pid_to_ust(struct ust_app *app, |
1928 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1929 | { |
1930 | int ret; | |
ffe60014 | 1931 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1932 | |
1933 | assert(app); | |
ffe60014 | 1934 | assert(ua_sess); |
4f3ab6ee | 1935 | assert(ua_chan); |
4f3ab6ee | 1936 | |
840cb59c | 1937 | health_code_update(); |
4f3ab6ee | 1938 | |
7972aab2 DG |
1939 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1940 | app->sock); | |
86acf0da | 1941 | |
ffe60014 DG |
1942 | /* Send channel to the application. */ |
1943 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1944 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1945 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1946 | goto error; | |
569744c5 JR |
1947 | } else if (ret == -EAGAIN) { |
1948 | /* Caused by timeout. */ | |
1949 | WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".", | |
1950 | app->pid, ua_chan->name, ua_sess->tracing_id); | |
1951 | /* Treat this the same way as an application that is exiting. */ | |
1952 | ret = -ENOTCONN; | |
1953 | goto error; | |
a7169585 | 1954 | } else if (ret < 0) { |
b551a063 DG |
1955 | goto error; |
1956 | } | |
1957 | ||
d88aee68 DG |
1958 | health_code_update(); |
1959 | ||
ffe60014 DG |
1960 | /* Send all streams to application. */ |
1961 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1962 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 | 1963 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
569744c5 | 1964 | ret = -ENOTCONN; /* Caused by app exiting. */ |
a7169585 | 1965 | goto error; |
569744c5 JR |
1966 | } else if (ret == -EAGAIN) { |
1967 | /* Caused by timeout. */ | |
1968 | WARN("Communication with application %d timed out on send_stream for stream \"%s\" of channel \"%s\" of session \"%" PRIu64 "\".", | |
1969 | app->pid, stream->name, ua_chan->name, | |
1970 | ua_sess->tracing_id); | |
1971 | /* | |
1972 | * Treat this the same way as an application that is | |
1973 | * exiting. | |
1974 | */ | |
1975 | ret = -ENOTCONN; | |
a7169585 | 1976 | } else if (ret < 0) { |
ffe60014 DG |
1977 | goto error; |
1978 | } | |
1979 | /* We don't need the stream anymore once sent to the tracer. */ | |
1980 | cds_list_del(&stream->list); | |
fb45065e | 1981 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1982 | } |
ffe60014 DG |
1983 | /* Flag the channel that it is sent to the application. */ |
1984 | ua_chan->is_sent = 1; | |
ffe60014 | 1985 | |
b551a063 | 1986 | error: |
840cb59c | 1987 | health_code_update(); |
b551a063 DG |
1988 | return ret; |
1989 | } | |
1990 | ||
91d76f53 | 1991 | /* |
5b4a0ec0 | 1992 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1993 | * |
1994 | * Should be called with session mutex held. | |
91d76f53 | 1995 | */ |
edb67388 DG |
1996 | static |
1997 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1998 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1999 | { |
5b4a0ec0 | 2000 | int ret = 0; |
284d8f55 | 2001 | |
840cb59c | 2002 | health_code_update(); |
86acf0da | 2003 | |
5b4a0ec0 | 2004 | /* Create UST event on tracer */ |
fb45065e | 2005 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 2006 | ret = lttng_ust_ctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 2007 | &ua_event->obj); |
fb45065e | 2008 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 2009 | if (ret < 0) { |
569744c5 JR |
2010 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2011 | ret = 0; | |
2012 | DBG3("UST app create event failed. Application is dead: pid = %d, sock = %d", | |
2013 | app->pid, app->sock); | |
2014 | } else if (ret == -EAGAIN) { | |
3757b385 | 2015 | ret = 0; |
569744c5 JR |
2016 | WARN("UST app create event failed. Communication time out: pid = %d, sock = %d", |
2017 | app->pid, app->sock); | |
2018 | } else { | |
2019 | ERR("UST app create event '%s' failed with ret %d: pid = %d, sock = %d", | |
2020 | ua_event->attr.name, ret, app->pid, | |
2021 | app->sock); | |
ffe60014 | 2022 | } |
5b4a0ec0 | 2023 | goto error; |
91d76f53 | 2024 | } |
f6a9efaa | 2025 | |
5b4a0ec0 | 2026 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 2027 | |
569744c5 | 2028 | DBG2("UST app event %s created successfully for pid:%d object = %p", |
3428a1b7 | 2029 | ua_event->attr.name, app->pid, ua_event->obj); |
f6a9efaa | 2030 | |
840cb59c | 2031 | health_code_update(); |
86acf0da | 2032 | |
025faf73 DG |
2033 | /* Set filter if one is present. */ |
2034 | if (ua_event->filter) { | |
a154c7b8 | 2035 | ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj); |
025faf73 DG |
2036 | if (ret < 0) { |
2037 | goto error; | |
2038 | } | |
2039 | } | |
2040 | ||
7cc9a73c JI |
2041 | /* Set exclusions for the event */ |
2042 | if (ua_event->exclusion) { | |
c0901ffa | 2043 | ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj); |
7cc9a73c JI |
2044 | if (ret < 0) { |
2045 | goto error; | |
2046 | } | |
2047 | } | |
2048 | ||
8535a6d9 | 2049 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
2050 | if (ua_event->enabled) { |
2051 | /* | |
2052 | * We now need to explicitly enable the event, since it | |
2053 | * is now disabled at creation. | |
2054 | */ | |
3428a1b7 | 2055 | ret = enable_ust_object(app, ua_event->obj); |
40113787 MD |
2056 | if (ret < 0) { |
2057 | /* | |
2058 | * If we hit an EPERM, something is wrong with our enable call. If | |
2059 | * we get an EEXIST, there is a problem on the tracer side since we | |
2060 | * just created it. | |
2061 | */ | |
2062 | switch (ret) { | |
2063 | case -LTTNG_UST_ERR_PERM: | |
2064 | /* Code flow problem */ | |
2065 | assert(0); | |
2066 | case -LTTNG_UST_ERR_EXIST: | |
2067 | /* It's OK for our use case. */ | |
2068 | ret = 0; | |
2069 | break; | |
2070 | default: | |
2071 | break; | |
2072 | } | |
2073 | goto error; | |
2074 | } | |
8535a6d9 DG |
2075 | } |
2076 | ||
5b4a0ec0 | 2077 | error: |
840cb59c | 2078 | health_code_update(); |
5b4a0ec0 | 2079 | return ret; |
91d76f53 | 2080 | } |
48842b30 | 2081 | |
993578ff JR |
2082 | static int init_ust_event_notifier_from_event_rule( |
2083 | const struct lttng_event_rule *rule, | |
fc4b93fa | 2084 | struct lttng_ust_abi_event_notifier *event_notifier) |
993578ff JR |
2085 | { |
2086 | enum lttng_event_rule_status status; | |
fc4b93fa | 2087 | enum lttng_ust_abi_loglevel_type ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
993578ff JR |
2088 | int loglevel = -1, ret = 0; |
2089 | const char *pattern; | |
2090 | ||
993578ff JR |
2091 | |
2092 | memset(event_notifier, 0, sizeof(*event_notifier)); | |
2093 | ||
44760c20 JR |
2094 | if (lttng_event_rule_targets_agent_domain(rule)) { |
2095 | /* | |
2096 | * Special event for agents | |
2097 | * The actual meat of the event is in the filter that will be | |
2098 | * attached later on. | |
2099 | * Set the default values for the agent event. | |
2100 | */ | |
2101 | pattern = event_get_default_agent_ust_name( | |
2102 | lttng_event_rule_get_domain_type(rule)); | |
2103 | loglevel = 0; | |
fc4b93fa | 2104 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
44760c20 | 2105 | } else { |
85b05318 | 2106 | const struct lttng_log_level_rule *log_level_rule; |
993578ff | 2107 | |
45ce77e1 JR |
2108 | assert(lttng_event_rule_get_type(rule) == |
2109 | LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT); | |
2110 | ||
2111 | status = lttng_event_rule_user_tracepoint_get_name_pattern(rule, &pattern); | |
44760c20 JR |
2112 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
2113 | /* At this point, this is a fatal error. */ | |
2114 | abort(); | |
2115 | } | |
993578ff | 2116 | |
45ce77e1 | 2117 | status = lttng_event_rule_user_tracepoint_get_log_level_rule( |
85b05318 JR |
2118 | rule, &log_level_rule); |
2119 | if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { | |
fc4b93fa | 2120 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
85b05318 JR |
2121 | } else if (status == LTTNG_EVENT_RULE_STATUS_OK) { |
2122 | enum lttng_log_level_rule_status llr_status; | |
2123 | ||
2124 | switch (lttng_log_level_rule_get_type(log_level_rule)) { | |
2125 | case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY: | |
2126 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_SINGLE; | |
2127 | llr_status = lttng_log_level_rule_exactly_get_level( | |
2128 | log_level_rule, &loglevel); | |
2129 | break; | |
2130 | case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS: | |
2131 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_RANGE; | |
2132 | llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level( | |
2133 | log_level_rule, &loglevel); | |
2134 | break; | |
2135 | default: | |
2136 | abort(); | |
2137 | } | |
993578ff | 2138 | |
85b05318 JR |
2139 | assert(llr_status == LTTNG_LOG_LEVEL_RULE_STATUS_OK); |
2140 | } else { | |
2141 | /* At this point this is a fatal error. */ | |
2142 | abort(); | |
44760c20 | 2143 | } |
993578ff JR |
2144 | } |
2145 | ||
fc4b93fa | 2146 | event_notifier->event.instrumentation = LTTNG_UST_ABI_TRACEPOINT; |
993578ff | 2147 | ret = lttng_strncpy(event_notifier->event.name, pattern, |
cf771fa9 | 2148 | sizeof(event_notifier->event.name)); |
993578ff JR |
2149 | if (ret) { |
2150 | ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ", | |
2151 | pattern); | |
2152 | goto end; | |
2153 | } | |
2154 | ||
2155 | event_notifier->event.loglevel_type = ust_loglevel_type; | |
2156 | event_notifier->event.loglevel = loglevel; | |
2157 | end: | |
2158 | return ret; | |
2159 | } | |
2160 | ||
2161 | /* | |
2162 | * Create the specified event notifier against the user space tracer of a | |
2163 | * given application. | |
2164 | */ | |
2165 | static int create_ust_event_notifier(struct ust_app *app, | |
2166 | struct ust_app_event_notifier_rule *ua_event_notifier_rule) | |
2167 | { | |
2168 | int ret = 0; | |
267d66aa JR |
2169 | enum lttng_condition_status condition_status; |
2170 | const struct lttng_condition *condition = NULL; | |
fc4b93fa | 2171 | struct lttng_ust_abi_event_notifier event_notifier; |
267d66aa | 2172 | const struct lttng_event_rule *event_rule = NULL; |
f83be61d JR |
2173 | unsigned int capture_bytecode_count = 0, i; |
2174 | enum lttng_condition_status cond_status; | |
45ce77e1 | 2175 | enum lttng_event_rule_type event_rule_type; |
993578ff JR |
2176 | |
2177 | health_code_update(); | |
2178 | assert(app->event_notifier_group.object); | |
2179 | ||
267d66aa JR |
2180 | condition = lttng_trigger_get_const_condition( |
2181 | ua_event_notifier_rule->trigger); | |
2182 | assert(condition); | |
8dbb86b8 JR |
2183 | assert(lttng_condition_get_type(condition) == |
2184 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); | |
993578ff | 2185 | |
8dbb86b8 | 2186 | condition_status = lttng_condition_event_rule_matches_get_rule( |
d602bd6a | 2187 | condition, &event_rule); |
267d66aa | 2188 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); |
d602bd6a | 2189 | |
267d66aa | 2190 | assert(event_rule); |
45ce77e1 JR |
2191 | |
2192 | event_rule_type = lttng_event_rule_get_type(event_rule); | |
2193 | assert(event_rule_type == LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT || | |
2194 | event_rule_type == LTTNG_EVENT_RULE_TYPE_JUL_LOGGING || | |
2195 | event_rule_type == | |
2196 | LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING || | |
2197 | event_rule_type == | |
2198 | LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING); | |
267d66aa JR |
2199 | |
2200 | init_ust_event_notifier_from_event_rule(event_rule, &event_notifier); | |
993578ff | 2201 | event_notifier.event.token = ua_event_notifier_rule->token; |
533a90fb | 2202 | event_notifier.error_counter_index = ua_event_notifier_rule->error_counter_index; |
993578ff JR |
2203 | |
2204 | /* Create UST event notifier against the tracer. */ | |
2205 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 2206 | ret = lttng_ust_ctl_create_event_notifier(app->sock, &event_notifier, |
993578ff JR |
2207 | app->event_notifier_group.object, |
2208 | &ua_event_notifier_rule->obj); | |
2209 | pthread_mutex_unlock(&app->sock_lock); | |
2210 | if (ret < 0) { | |
569744c5 JR |
2211 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2212 | ret = 0; | |
2213 | DBG3("UST app create event notifier failed. Application is dead: pid = %d, sock = %d", | |
2214 | app->pid, app->sock); | |
2215 | } else if (ret == -EAGAIN) { | |
993578ff | 2216 | ret = 0; |
569744c5 JR |
2217 | WARN("UST app create event notifier failed. Communication time out: pid = %d, sock = %d", |
2218 | app->pid, app->sock); | |
2219 | } else { | |
2220 | ERR("UST app create event notifier '%s' failed with ret %d: pid = %d, sock = %d", | |
2221 | event_notifier.event.name, ret, app->pid, | |
2222 | app->sock); | |
993578ff | 2223 | } |
993578ff JR |
2224 | goto error; |
2225 | } | |
2226 | ||
2227 | ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle; | |
2228 | ||
569744c5 JR |
2229 | DBG2("UST app event notifier %s created successfully: app = '%s': pid = %d), object = %p", |
2230 | event_notifier.event.name, app->name, app->pid, | |
993578ff JR |
2231 | ua_event_notifier_rule->obj); |
2232 | ||
2233 | health_code_update(); | |
2234 | ||
2235 | /* Set filter if one is present. */ | |
2236 | if (ua_event_notifier_rule->filter) { | |
2237 | ret = set_ust_object_filter(app, ua_event_notifier_rule->filter, | |
2238 | ua_event_notifier_rule->obj); | |
2239 | if (ret < 0) { | |
2240 | goto error; | |
2241 | } | |
2242 | } | |
2243 | ||
2244 | /* Set exclusions for the event. */ | |
2245 | if (ua_event_notifier_rule->exclusion) { | |
2246 | ret = set_ust_object_exclusions(app, | |
2247 | ua_event_notifier_rule->exclusion, | |
2248 | ua_event_notifier_rule->obj); | |
2249 | if (ret < 0) { | |
2250 | goto error; | |
2251 | } | |
2252 | } | |
f83be61d JR |
2253 | |
2254 | /* Set the capture bytecodes. */ | |
8dbb86b8 | 2255 | cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( |
f83be61d JR |
2256 | condition, &capture_bytecode_count); |
2257 | assert(cond_status == LTTNG_CONDITION_STATUS_OK); | |
2258 | ||
2259 | for (i = 0; i < capture_bytecode_count; i++) { | |
2260 | const struct lttng_bytecode *capture_bytecode = | |
8dbb86b8 | 2261 | lttng_condition_event_rule_matches_get_capture_bytecode_at_index( |
f83be61d JR |
2262 | condition, i); |
2263 | ||
11f6ce94 | 2264 | ret = set_ust_capture(app, capture_bytecode, i, |
f83be61d JR |
2265 | ua_event_notifier_rule->obj); |
2266 | if (ret < 0) { | |
2267 | goto error; | |
2268 | } | |
2269 | } | |
993578ff JR |
2270 | |
2271 | /* | |
2272 | * We now need to explicitly enable the event, since it | |
2273 | * is disabled at creation. | |
2274 | */ | |
2275 | ret = enable_ust_object(app, ua_event_notifier_rule->obj); | |
2276 | if (ret < 0) { | |
2277 | /* | |
2278 | * If we hit an EPERM, something is wrong with our enable call. | |
2279 | * If we get an EEXIST, there is a problem on the tracer side | |
2280 | * since we just created it. | |
2281 | */ | |
2282 | switch (ret) { | |
2283 | case -LTTNG_UST_ERR_PERM: | |
2284 | /* Code flow problem. */ | |
2285 | abort(); | |
2286 | case -LTTNG_UST_ERR_EXIST: | |
2287 | /* It's OK for our use case. */ | |
2288 | ret = 0; | |
2289 | break; | |
2290 | default: | |
2291 | break; | |
2292 | } | |
2293 | ||
2294 | goto error; | |
2295 | } | |
2296 | ||
2297 | ua_event_notifier_rule->enabled = true; | |
2298 | ||
2299 | error: | |
2300 | health_code_update(); | |
2301 | return ret; | |
2302 | } | |
2303 | ||
5b4a0ec0 DG |
2304 | /* |
2305 | * Copy data between an UST app event and a LTT event. | |
2306 | */ | |
421cb601 | 2307 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
2308 | struct ltt_ust_event *uevent) |
2309 | { | |
b4ffad32 JI |
2310 | size_t exclusion_alloc_size; |
2311 | ||
48842b30 DG |
2312 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
2313 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
2314 | ||
fc34caaa DG |
2315 | ua_event->enabled = uevent->enabled; |
2316 | ||
5b4a0ec0 DG |
2317 | /* Copy event attributes */ |
2318 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
2319 | ||
53a80697 MD |
2320 | /* Copy filter bytecode */ |
2321 | if (uevent->filter) { | |
2b00d462 | 2322 | ua_event->filter = lttng_bytecode_copy(uevent->filter); |
025faf73 | 2323 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2324 | } |
b4ffad32 JI |
2325 | |
2326 | /* Copy exclusion data */ | |
2327 | if (uevent->exclusion) { | |
51755dc8 | 2328 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
fc4b93fa | 2329 | LTTNG_UST_ABI_SYM_NAME_LEN * uevent->exclusion->count; |
b4ffad32 | 2330 | ua_event->exclusion = zmalloc(exclusion_alloc_size); |
5f8df26c JI |
2331 | if (ua_event->exclusion == NULL) { |
2332 | PERROR("malloc"); | |
2333 | } else { | |
2334 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2335 | exclusion_alloc_size); | |
b4ffad32 JI |
2336 | } |
2337 | } | |
48842b30 DG |
2338 | } |
2339 | ||
5b4a0ec0 DG |
2340 | /* |
2341 | * Copy data between an UST app channel and a LTT channel. | |
2342 | */ | |
421cb601 | 2343 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2344 | struct ltt_ust_channel *uchan) |
2345 | { | |
fc34caaa | 2346 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2347 | |
2348 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2349 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2350 | |
1624d5b7 JD |
2351 | ua_chan->tracefile_size = uchan->tracefile_size; |
2352 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2353 | ||
ffe60014 DG |
2354 | /* Copy event attributes since the layout is different. */ |
2355 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2356 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2357 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2358 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2359 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2360 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 2361 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
2362 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2363 | ||
ffe60014 DG |
2364 | /* |
2365 | * Note that the attribute channel type is not set since the channel on the | |
2366 | * tracing registry side does not have this information. | |
2367 | */ | |
48842b30 | 2368 | |
fc34caaa | 2369 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2370 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2371 | |
fc34caaa | 2372 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2373 | } |
2374 | ||
5b4a0ec0 DG |
2375 | /* |
2376 | * Copy data between a UST app session and a regular LTT session. | |
2377 | */ | |
421cb601 | 2378 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2379 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2380 | { |
477d7741 MD |
2381 | struct tm *timeinfo; |
2382 | char datetime[16]; | |
2383 | int ret; | |
d7ba1388 | 2384 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2385 | |
940c4592 | 2386 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2387 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2388 | |
421cb601 | 2389 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2390 | |
7972aab2 DG |
2391 | ua_sess->tracing_id = usess->id; |
2392 | ua_sess->id = get_next_session_id(); | |
ff588497 JR |
2393 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); |
2394 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); | |
2395 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); | |
2396 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); | |
7972aab2 DG |
2397 | ua_sess->buffer_type = usess->buffer_type; |
2398 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2399 | |
7972aab2 | 2400 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2401 | consumer_output_get(usess->consumer); |
7972aab2 | 2402 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2403 | |
2bba9e53 | 2404 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2405 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2406 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2407 | &usess->metadata_attr); | |
7972aab2 DG |
2408 | |
2409 | switch (ua_sess->buffer_type) { | |
2410 | case LTTNG_BUFFER_PER_PID: | |
2411 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2412 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2413 | datetime); |
2414 | break; | |
2415 | case LTTNG_BUFFER_PER_UID: | |
2416 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 | 2417 | DEFAULT_UST_TRACE_UID_PATH, |
ff588497 | 2418 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
470cc211 | 2419 | app->bits_per_long); |
7972aab2 DG |
2420 | break; |
2421 | default: | |
2422 | assert(0); | |
2423 | goto error; | |
2424 | } | |
477d7741 MD |
2425 | if (ret < 0) { |
2426 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 2427 | assert(0); |
7972aab2 | 2428 | goto error; |
477d7741 MD |
2429 | } |
2430 | ||
3d071855 MD |
2431 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2432 | sizeof(ua_sess->root_shm_path)); | |
2433 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2434 | strncpy(ua_sess->shm_path, usess->shm_path, |
2435 | sizeof(ua_sess->shm_path)); | |
2436 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2437 | if (ua_sess->shm_path[0]) { | |
2438 | switch (ua_sess->buffer_type) { | |
2439 | case LTTNG_BUFFER_PER_PID: | |
2440 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2441 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2442 | app->name, app->pid, datetime); |
2443 | break; | |
2444 | case LTTNG_BUFFER_PER_UID: | |
2445 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2446 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2447 | app->uid, app->bits_per_long); |
2448 | break; | |
2449 | default: | |
2450 | assert(0); | |
2451 | goto error; | |
2452 | } | |
2453 | if (ret < 0) { | |
2454 | PERROR("sprintf UST shadow copy session"); | |
2455 | assert(0); | |
2456 | goto error; | |
2457 | } | |
2458 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2459 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2460 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2461 | } | |
6addfa37 | 2462 | return; |
7972aab2 DG |
2463 | |
2464 | error: | |
6addfa37 | 2465 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2466 | } |
2467 | ||
78f0bacd DG |
2468 | /* |
2469 | * Lookup sesison wrapper. | |
2470 | */ | |
84cd17c6 | 2471 | static |
fb9a95c4 | 2472 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2473 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2474 | { |
2475 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2476 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2477 | } |
2478 | ||
421cb601 DG |
2479 | /* |
2480 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2481 | * id. |
421cb601 | 2482 | */ |
48842b30 | 2483 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2484 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2485 | { |
bec39940 | 2486 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2487 | struct lttng_ht_node_u64 *node; |
48842b30 | 2488 | |
84cd17c6 | 2489 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2490 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2491 | if (node == NULL) { |
2492 | goto error; | |
2493 | } | |
2494 | ||
2495 | return caa_container_of(node, struct ust_app_session, node); | |
2496 | ||
2497 | error: | |
2498 | return NULL; | |
2499 | } | |
2500 | ||
7972aab2 DG |
2501 | /* |
2502 | * Setup buffer registry per PID for the given session and application. If none | |
2503 | * is found, a new one is created, added to the global registry and | |
2504 | * initialized. If regp is valid, it's set with the newly created object. | |
2505 | * | |
2506 | * Return 0 on success or else a negative value. | |
2507 | */ | |
2508 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2509 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2510 | { | |
2511 | int ret = 0; | |
2512 | struct buffer_reg_pid *reg_pid; | |
2513 | ||
2514 | assert(ua_sess); | |
2515 | assert(app); | |
2516 | ||
2517 | rcu_read_lock(); | |
2518 | ||
2519 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2520 | if (!reg_pid) { | |
2521 | /* | |
2522 | * This is the create channel path meaning that if there is NO | |
2523 | * registry available, we have to create one for this session. | |
2524 | */ | |
d7ba1388 | 2525 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2526 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2527 | if (ret < 0) { |
2528 | goto error; | |
2529 | } | |
7972aab2 DG |
2530 | } else { |
2531 | goto end; | |
2532 | } | |
2533 | ||
2534 | /* Initialize registry. */ | |
2535 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2536 | app->bits_per_long, app->uint8_t_alignment, | |
2537 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2538 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2539 | app->byte_order, app->version.major, app->version.minor, |
2540 | reg_pid->root_shm_path, reg_pid->shm_path, | |
ff588497 JR |
2541 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
2542 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
2543 | ua_sess->tracing_id, | |
8de88061 | 2544 | app->uid); |
7972aab2 | 2545 | if (ret < 0) { |
286c991a MD |
2546 | /* |
2547 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2548 | * destroy the buffer registry, because it is always expected | |
2549 | * that if the buffer registry can be found, its ust registry is | |
2550 | * non-NULL. | |
2551 | */ | |
2552 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2553 | goto error; |
2554 | } | |
2555 | ||
286c991a MD |
2556 | buffer_reg_pid_add(reg_pid); |
2557 | ||
7972aab2 DG |
2558 | DBG3("UST app buffer registry per PID created successfully"); |
2559 | ||
2560 | end: | |
2561 | if (regp) { | |
2562 | *regp = reg_pid; | |
2563 | } | |
2564 | error: | |
2565 | rcu_read_unlock(); | |
2566 | return ret; | |
2567 | } | |
2568 | ||
2569 | /* | |
2570 | * Setup buffer registry per UID for the given session and application. If none | |
2571 | * is found, a new one is created, added to the global registry and | |
2572 | * initialized. If regp is valid, it's set with the newly created object. | |
2573 | * | |
2574 | * Return 0 on success or else a negative value. | |
2575 | */ | |
2576 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2577 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2578 | struct ust_app *app, struct buffer_reg_uid **regp) |
2579 | { | |
2580 | int ret = 0; | |
2581 | struct buffer_reg_uid *reg_uid; | |
2582 | ||
2583 | assert(usess); | |
2584 | assert(app); | |
2585 | ||
2586 | rcu_read_lock(); | |
2587 | ||
2588 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2589 | if (!reg_uid) { | |
2590 | /* | |
2591 | * This is the create channel path meaning that if there is NO | |
2592 | * registry available, we have to create one for this session. | |
2593 | */ | |
2594 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2595 | LTTNG_DOMAIN_UST, ®_uid, |
2596 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2597 | if (ret < 0) { |
2598 | goto error; | |
2599 | } | |
7972aab2 DG |
2600 | } else { |
2601 | goto end; | |
2602 | } | |
2603 | ||
2604 | /* Initialize registry. */ | |
af6142cf | 2605 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2606 | app->bits_per_long, app->uint8_t_alignment, |
2607 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2608 | app->uint64_t_alignment, app->long_alignment, |
2609 | app->byte_order, app->version.major, | |
3d071855 | 2610 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2611 | reg_uid->shm_path, usess->uid, usess->gid, |
2612 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2613 | if (ret < 0) { |
286c991a MD |
2614 | /* |
2615 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2616 | * destroy the buffer registry, because it is always expected | |
2617 | * that if the buffer registry can be found, its ust registry is | |
2618 | * non-NULL. | |
2619 | */ | |
2620 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2621 | goto error; |
2622 | } | |
2623 | /* Add node to teardown list of the session. */ | |
2624 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2625 | ||
286c991a | 2626 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2627 | |
286c991a | 2628 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2629 | end: |
2630 | if (regp) { | |
2631 | *regp = reg_uid; | |
2632 | } | |
2633 | error: | |
2634 | rcu_read_unlock(); | |
2635 | return ret; | |
2636 | } | |
2637 | ||
421cb601 | 2638 | /* |
3d8ca23b | 2639 | * Create a session on the tracer side for the given app. |
421cb601 | 2640 | * |
3d8ca23b DG |
2641 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2642 | * untouched. If the session was created, is_created is set to 1. On error, | |
2643 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2644 | * be NULL. | |
2645 | * | |
2646 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
b623cb6a | 2647 | * -ENOTCONN which is the default code if the lttng_ust_ctl_create_session fails. |
421cb601 | 2648 | */ |
03f91eaa | 2649 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2650 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2651 | int *is_created) | |
421cb601 | 2652 | { |
3d8ca23b | 2653 | int ret, created = 0; |
421cb601 DG |
2654 | struct ust_app_session *ua_sess; |
2655 | ||
3d8ca23b DG |
2656 | assert(usess); |
2657 | assert(app); | |
2658 | assert(ua_sess_ptr); | |
2659 | ||
840cb59c | 2660 | health_code_update(); |
86acf0da | 2661 | |
421cb601 DG |
2662 | ua_sess = lookup_session_by_app(usess, app); |
2663 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2664 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2665 | app->pid, usess->id); |
40bbd087 | 2666 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2667 | if (ua_sess == NULL) { |
2668 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2669 | ret = -ENOMEM; |
2670 | goto error; | |
421cb601 | 2671 | } |
477d7741 | 2672 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2673 | created = 1; |
421cb601 DG |
2674 | } |
2675 | ||
7972aab2 DG |
2676 | switch (usess->buffer_type) { |
2677 | case LTTNG_BUFFER_PER_PID: | |
2678 | /* Init local registry. */ | |
2679 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2680 | if (ret < 0) { |
e64207cf | 2681 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2682 | goto error; |
2683 | } | |
2684 | break; | |
2685 | case LTTNG_BUFFER_PER_UID: | |
2686 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2687 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2688 | if (ret < 0) { |
e64207cf | 2689 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2690 | goto error; |
2691 | } | |
2692 | break; | |
2693 | default: | |
2694 | assert(0); | |
2695 | ret = -EINVAL; | |
2696 | goto error; | |
2697 | } | |
2698 | ||
2699 | health_code_update(); | |
2700 | ||
2701 | if (ua_sess->handle == -1) { | |
fb45065e | 2702 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 2703 | ret = lttng_ust_ctl_create_session(app->sock); |
fb45065e | 2704 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 | 2705 | if (ret < 0) { |
569744c5 JR |
2706 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2707 | DBG("UST app creating session failed. Application is dead: pid = %d, sock = %d", | |
2708 | app->pid, app->sock); | |
3757b385 | 2709 | ret = 0; |
569744c5 JR |
2710 | } else if (ret == -EAGAIN) { |
2711 | DBG("UST app creating session failed. Communication time out: pid = %d, sock = %d", | |
2712 | app->pid, app->sock); | |
2713 | ret = 0; | |
2714 | } else { | |
2715 | ERR("UST app creating session failed with ret %d: pid = %d, sock =%d", | |
2716 | ret, app->pid, app->sock); | |
ffe60014 | 2717 | } |
d0b96690 | 2718 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2719 | if (ret != -ENOMEM) { |
2720 | /* | |
2721 | * Tracer is probably gone or got an internal error so let's | |
2722 | * behave like it will soon unregister or not usable. | |
2723 | */ | |
2724 | ret = -ENOTCONN; | |
2725 | } | |
2726 | goto error; | |
421cb601 DG |
2727 | } |
2728 | ||
7972aab2 DG |
2729 | ua_sess->handle = ret; |
2730 | ||
2731 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2732 | lttng_ht_node_init_u64(&ua_sess->node, |
2733 | ua_sess->tracing_id); | |
2734 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2735 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2736 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2737 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2738 | |
2739 | DBG2("UST app session created successfully with handle %d", ret); | |
2740 | } | |
2741 | ||
2742 | *ua_sess_ptr = ua_sess; | |
2743 | if (is_created) { | |
2744 | *is_created = created; | |
2745 | } | |
2746 | ||
2747 | /* Everything went well. */ | |
2748 | ret = 0; | |
2749 | ||
2750 | error: | |
2751 | health_code_update(); | |
2752 | return ret; | |
2753 | } | |
2754 | ||
6a6b2068 JG |
2755 | /* |
2756 | * Match function for a hash table lookup of ust_app_ctx. | |
2757 | * | |
2758 | * It matches an ust app context based on the context type and, in the case | |
2759 | * of perf counters, their name. | |
2760 | */ | |
2761 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2762 | { | |
2763 | struct ust_app_ctx *ctx; | |
bdf64013 | 2764 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2765 | |
2766 | assert(node); | |
2767 | assert(_key); | |
2768 | ||
2769 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2770 | key = _key; | |
2771 | ||
2772 | /* Context type */ | |
2773 | if (ctx->ctx.ctx != key->ctx) { | |
2774 | goto no_match; | |
2775 | } | |
2776 | ||
bdf64013 | 2777 | switch(key->ctx) { |
fc4b93fa | 2778 | case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER: |
6a6b2068 | 2779 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2780 | ctx->ctx.u.perf_counter.name, |
2781 | sizeof(key->u.perf_counter.name))) { | |
2782 | goto no_match; | |
2783 | } | |
2784 | break; | |
fc4b93fa | 2785 | case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT: |
bdf64013 JG |
2786 | if (strcmp(key->u.app_ctx.provider_name, |
2787 | ctx->ctx.u.app_ctx.provider_name) || | |
2788 | strcmp(key->u.app_ctx.ctx_name, | |
2789 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2790 | goto no_match; |
2791 | } | |
bdf64013 JG |
2792 | break; |
2793 | default: | |
2794 | break; | |
6a6b2068 JG |
2795 | } |
2796 | ||
2797 | /* Match. */ | |
2798 | return 1; | |
2799 | ||
2800 | no_match: | |
2801 | return 0; | |
2802 | } | |
2803 | ||
2804 | /* | |
2805 | * Lookup for an ust app context from an lttng_ust_context. | |
2806 | * | |
be184a0f | 2807 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2808 | * Return an ust_app_ctx object or NULL on error. |
2809 | */ | |
2810 | static | |
2811 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2812 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2813 | { |
2814 | struct lttng_ht_iter iter; | |
2815 | struct lttng_ht_node_ulong *node; | |
2816 | struct ust_app_ctx *app_ctx = NULL; | |
2817 | ||
2818 | assert(uctx); | |
2819 | assert(ht); | |
2820 | ||
2821 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2822 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2823 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2824 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2825 | if (!node) { | |
2826 | goto end; | |
2827 | } | |
2828 | ||
2829 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2830 | ||
2831 | end: | |
2832 | return app_ctx; | |
2833 | } | |
2834 | ||
7972aab2 DG |
2835 | /* |
2836 | * Create a context for the channel on the tracer. | |
2837 | * | |
2838 | * Called with UST app session lock held and a RCU read side lock. | |
2839 | */ | |
2840 | static | |
c9edf082 | 2841 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
f3db82be | 2842 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2843 | struct ust_app *app) |
2844 | { | |
2845 | int ret = 0; | |
7972aab2 DG |
2846 | struct ust_app_ctx *ua_ctx; |
2847 | ||
2848 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2849 | ||
6a6b2068 JG |
2850 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2851 | if (ua_ctx) { | |
7972aab2 DG |
2852 | ret = -EEXIST; |
2853 | goto error; | |
2854 | } | |
2855 | ||
2856 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2857 | if (ua_ctx == NULL) { | |
2858 | /* malloc failed */ | |
7682f304 | 2859 | ret = -ENOMEM; |
7972aab2 DG |
2860 | goto error; |
2861 | } | |
2862 | ||
2863 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2864 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2865 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2866 | |
2867 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2868 | if (ret < 0) { | |
2869 | goto error; | |
2870 | } | |
2871 | ||
2872 | error: | |
2873 | return ret; | |
2874 | } | |
2875 | ||
2876 | /* | |
2877 | * Enable on the tracer side a ust app event for the session and channel. | |
2878 | * | |
2879 | * Called with UST app session lock held. | |
2880 | */ | |
2881 | static | |
2882 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2883 | struct ust_app_event *ua_event, struct ust_app *app) | |
2884 | { | |
2885 | int ret; | |
2886 | ||
3428a1b7 | 2887 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2888 | if (ret < 0) { |
2889 | goto error; | |
2890 | } | |
2891 | ||
2892 | ua_event->enabled = 1; | |
2893 | ||
2894 | error: | |
2895 | return ret; | |
2896 | } | |
2897 | ||
2898 | /* | |
2899 | * Disable on the tracer side a ust app event for the session and channel. | |
2900 | */ | |
2901 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2902 | struct ust_app_event *ua_event, struct ust_app *app) | |
2903 | { | |
2904 | int ret; | |
2905 | ||
e2456d0a | 2906 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2907 | if (ret < 0) { |
2908 | goto error; | |
2909 | } | |
2910 | ||
2911 | ua_event->enabled = 0; | |
2912 | ||
2913 | error: | |
2914 | return ret; | |
2915 | } | |
2916 | ||
2917 | /* | |
2918 | * Lookup ust app channel for session and disable it on the tracer side. | |
2919 | */ | |
2920 | static | |
2921 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2922 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2923 | { | |
2924 | int ret; | |
2925 | ||
2926 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2927 | if (ret < 0) { | |
2928 | goto error; | |
2929 | } | |
2930 | ||
2931 | ua_chan->enabled = 0; | |
2932 | ||
2933 | error: | |
2934 | return ret; | |
2935 | } | |
2936 | ||
2937 | /* | |
2938 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2939 | * MUST be called with a RCU read side lock acquired. | |
2940 | */ | |
2941 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2942 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2943 | { | |
2944 | int ret = 0; | |
2945 | struct lttng_ht_iter iter; | |
2946 | struct lttng_ht_node_str *ua_chan_node; | |
2947 | struct ust_app_channel *ua_chan; | |
2948 | ||
2949 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2950 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2951 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2952 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2953 | uchan->name, ua_sess->tracing_id); |
2954 | goto error; | |
2955 | } | |
2956 | ||
2957 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2958 | ||
2959 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2960 | if (ret < 0) { | |
2961 | goto error; | |
2962 | } | |
2963 | ||
2964 | error: | |
2965 | return ret; | |
2966 | } | |
2967 | ||
2968 | /* | |
2969 | * Ask the consumer to create a channel and get it if successful. | |
2970 | * | |
fad1ed2f JR |
2971 | * Called with UST app session lock held. |
2972 | * | |
7972aab2 DG |
2973 | * Return 0 on success or else a negative value. |
2974 | */ | |
2975 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2976 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2977 | int bitness, struct ust_registry_session *registry, |
2978 | uint64_t trace_archive_id) | |
7972aab2 DG |
2979 | { |
2980 | int ret; | |
2981 | unsigned int nb_fd = 0; | |
2982 | struct consumer_socket *socket; | |
2983 | ||
2984 | assert(usess); | |
2985 | assert(ua_sess); | |
2986 | assert(ua_chan); | |
2987 | assert(registry); | |
2988 | ||
2989 | rcu_read_lock(); | |
2990 | health_code_update(); | |
2991 | ||
2992 | /* Get the right consumer socket for the application. */ | |
2993 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2994 | if (!socket) { | |
2995 | ret = -EINVAL; | |
2996 | goto error; | |
2997 | } | |
2998 | ||
2999 | health_code_update(); | |
3000 | ||
3001 | /* Need one fd for the channel. */ | |
3002 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3003 | if (ret < 0) { | |
3004 | ERR("Exhausted number of available FD upon create channel"); | |
3005 | goto error; | |
3006 | } | |
3007 | ||
3008 | /* | |
3009 | * Ask consumer to create channel. The consumer will return the number of | |
3010 | * stream we have to expect. | |
3011 | */ | |
3012 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 3013 | registry, usess->current_trace_chunk); |
7972aab2 DG |
3014 | if (ret < 0) { |
3015 | goto error_ask; | |
3016 | } | |
3017 | ||
3018 | /* | |
3019 | * Compute the number of fd needed before receiving them. It must be 2 per | |
3020 | * stream (2 being the default value here). | |
3021 | */ | |
3022 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
3023 | ||
3024 | /* Reserve the amount of file descriptor we need. */ | |
3025 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
3026 | if (ret < 0) { | |
3027 | ERR("Exhausted number of available FD upon create channel"); | |
3028 | goto error_fd_get_stream; | |
3029 | } | |
3030 | ||
3031 | health_code_update(); | |
3032 | ||
3033 | /* | |
db786d44 | 3034 | * Now get the channel from the consumer. This call will populate the stream |
7972aab2 DG |
3035 | * list of that channel and set the ust objects. |
3036 | */ | |
d9078d0c DG |
3037 | if (usess->consumer->enabled) { |
3038 | ret = ust_consumer_get_channel(socket, ua_chan); | |
3039 | if (ret < 0) { | |
3040 | goto error_destroy; | |
3041 | } | |
7972aab2 DG |
3042 | } |
3043 | ||
3044 | rcu_read_unlock(); | |
3045 | return 0; | |
3046 | ||
3047 | error_destroy: | |
3048 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
3049 | error_fd_get_stream: | |
3050 | /* | |
3051 | * Initiate a destroy channel on the consumer since we had an error | |
3052 | * handling it on our side. The return value is of no importance since we | |
3053 | * already have a ret value set by the previous error that we need to | |
3054 | * return. | |
3055 | */ | |
3056 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
3057 | error_ask: | |
3058 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3059 | error: | |
3060 | health_code_update(); | |
3061 | rcu_read_unlock(); | |
3062 | return ret; | |
3063 | } | |
3064 | ||
3065 | /* | |
3066 | * Duplicate the ust data object of the ust app stream and save it in the | |
3067 | * buffer registry stream. | |
3068 | * | |
3069 | * Return 0 on success or else a negative value. | |
3070 | */ | |
3071 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
3072 | struct ust_app_stream *stream) | |
3073 | { | |
3074 | int ret; | |
3075 | ||
3076 | assert(reg_stream); | |
3077 | assert(stream); | |
3078 | ||
ec472351 | 3079 | /* Duplicating a stream requires 2 new fds. Reserve them. */ |
7972aab2 DG |
3080 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); |
3081 | if (ret < 0) { | |
3082 | ERR("Exhausted number of available FD upon duplicate stream"); | |
3083 | goto error; | |
3084 | } | |
3085 | ||
3086 | /* Duplicate object for stream once the original is in the registry. */ | |
b623cb6a | 3087 | ret = lttng_ust_ctl_duplicate_ust_object_data(&stream->obj, |
7972aab2 DG |
3088 | reg_stream->obj.ust); |
3089 | if (ret < 0) { | |
3090 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
3091 | reg_stream->obj.ust, stream->obj, ret); | |
3092 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
3093 | goto error; | |
3094 | } | |
3095 | stream->handle = stream->obj->handle; | |
3096 | ||
3097 | error: | |
3098 | return ret; | |
3099 | } | |
3100 | ||
3101 | /* | |
3102 | * Duplicate the ust data object of the ust app. channel and save it in the | |
3103 | * buffer registry channel. | |
3104 | * | |
3105 | * Return 0 on success or else a negative value. | |
3106 | */ | |
3273699d | 3107 | static int duplicate_channel_object(struct buffer_reg_channel *buf_reg_chan, |
7972aab2 DG |
3108 | struct ust_app_channel *ua_chan) |
3109 | { | |
3110 | int ret; | |
3111 | ||
3273699d | 3112 | assert(buf_reg_chan); |
7972aab2 DG |
3113 | assert(ua_chan); |
3114 | ||
ec472351 | 3115 | /* Duplicating a channel requires 1 new fd. Reserve it. */ |
7972aab2 DG |
3116 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
3117 | if (ret < 0) { | |
3118 | ERR("Exhausted number of available FD upon duplicate channel"); | |
3119 | goto error_fd_get; | |
3120 | } | |
3121 | ||
3122 | /* Duplicate object for stream once the original is in the registry. */ | |
b623cb6a | 3123 | ret = lttng_ust_ctl_duplicate_ust_object_data(&ua_chan->obj, buf_reg_chan->obj.ust); |
7972aab2 DG |
3124 | if (ret < 0) { |
3125 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
3273699d | 3126 | buf_reg_chan->obj.ust, ua_chan->obj, ret); |
7972aab2 DG |
3127 | goto error; |
3128 | } | |
3129 | ua_chan->handle = ua_chan->obj->handle; | |
3130 | ||
3131 | return 0; | |
3132 | ||
3133 | error: | |
3134 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3135 | error_fd_get: | |
3136 | return ret; | |
3137 | } | |
3138 | ||
3139 | /* | |
3140 | * For a given channel buffer registry, setup all streams of the given ust | |
3141 | * application channel. | |
3142 | * | |
3143 | * Return 0 on success or else a negative value. | |
3144 | */ | |
3273699d | 3145 | static int setup_buffer_reg_streams(struct buffer_reg_channel *buf_reg_chan, |
fb45065e MD |
3146 | struct ust_app_channel *ua_chan, |
3147 | struct ust_app *app) | |
7972aab2 DG |
3148 | { |
3149 | int ret = 0; | |
3150 | struct ust_app_stream *stream, *stmp; | |
3151 | ||
3273699d | 3152 | assert(buf_reg_chan); |
7972aab2 DG |
3153 | assert(ua_chan); |
3154 | ||
3155 | DBG2("UST app setup buffer registry stream"); | |
3156 | ||
3157 | /* Send all streams to application. */ | |
3158 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
3159 | struct buffer_reg_stream *reg_stream; | |
3160 | ||
3161 | ret = buffer_reg_stream_create(®_stream); | |
3162 | if (ret < 0) { | |
3163 | goto error; | |
3164 | } | |
3165 | ||
3166 | /* | |
3167 | * Keep original pointer and nullify it in the stream so the delete | |
3168 | * stream call does not release the object. | |
3169 | */ | |
3170 | reg_stream->obj.ust = stream->obj; | |
3171 | stream->obj = NULL; | |
3273699d | 3172 | buffer_reg_stream_add(reg_stream, buf_reg_chan); |
421cb601 | 3173 | |
7972aab2 DG |
3174 | /* We don't need the streams anymore. */ |
3175 | cds_list_del(&stream->list); | |
fb45065e | 3176 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 3177 | } |
421cb601 | 3178 | |
7972aab2 DG |
3179 | error: |
3180 | return ret; | |
3181 | } | |
3182 | ||
3183 | /* | |
3184 | * Create a buffer registry channel for the given session registry and | |
3185 | * application channel object. If regp pointer is valid, it's set with the | |
3186 | * created object. Important, the created object is NOT added to the session | |
3187 | * registry hash table. | |
3188 | * | |
3189 | * Return 0 on success else a negative value. | |
3190 | */ | |
3191 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
3192 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
3193 | { | |
3194 | int ret; | |
3273699d | 3195 | struct buffer_reg_channel *buf_reg_chan = NULL; |
7972aab2 DG |
3196 | |
3197 | assert(reg_sess); | |
3198 | assert(ua_chan); | |
3199 | ||
3200 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
3201 | ||
3202 | /* Create buffer registry channel. */ | |
3273699d | 3203 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &buf_reg_chan); |
7972aab2 DG |
3204 | if (ret < 0) { |
3205 | goto error_create; | |
421cb601 | 3206 | } |
3273699d FD |
3207 | assert(buf_reg_chan); |
3208 | buf_reg_chan->consumer_key = ua_chan->key; | |
3209 | buf_reg_chan->subbuf_size = ua_chan->attr.subbuf_size; | |
3210 | buf_reg_chan->num_subbuf = ua_chan->attr.num_subbuf; | |
421cb601 | 3211 | |
7972aab2 DG |
3212 | /* Create and add a channel registry to session. */ |
3213 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
3214 | ua_chan->tracing_channel_id); | |
3215 | if (ret < 0) { | |
3216 | goto error; | |
d88aee68 | 3217 | } |
3273699d | 3218 | buffer_reg_channel_add(reg_sess, buf_reg_chan); |
d88aee68 | 3219 | |
7972aab2 | 3220 | if (regp) { |
3273699d | 3221 | *regp = buf_reg_chan; |
3d8ca23b | 3222 | } |
d88aee68 | 3223 | |
7972aab2 | 3224 | return 0; |
3d8ca23b DG |
3225 | |
3226 | error: | |
7972aab2 | 3227 | /* Safe because the registry channel object was not added to any HT. */ |
3273699d | 3228 | buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); |
7972aab2 | 3229 | error_create: |
3d8ca23b | 3230 | return ret; |
421cb601 DG |
3231 | } |
3232 | ||
55cc08a6 | 3233 | /* |
7972aab2 DG |
3234 | * Setup buffer registry channel for the given session registry and application |
3235 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 3236 | * |
7972aab2 | 3237 | * Return 0 on success else a negative value. |
55cc08a6 | 3238 | */ |
7972aab2 | 3239 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
3273699d | 3240 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *buf_reg_chan, |
fb45065e | 3241 | struct ust_app *app) |
55cc08a6 | 3242 | { |
7972aab2 | 3243 | int ret; |
55cc08a6 | 3244 | |
7972aab2 | 3245 | assert(reg_sess); |
3273699d | 3246 | assert(buf_reg_chan); |
7972aab2 DG |
3247 | assert(ua_chan); |
3248 | assert(ua_chan->obj); | |
55cc08a6 | 3249 | |
7972aab2 | 3250 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 3251 | |
7972aab2 | 3252 | /* Setup all streams for the registry. */ |
3273699d | 3253 | ret = setup_buffer_reg_streams(buf_reg_chan, ua_chan, app); |
7972aab2 | 3254 | if (ret < 0) { |
55cc08a6 DG |
3255 | goto error; |
3256 | } | |
3257 | ||
3273699d | 3258 | buf_reg_chan->obj.ust = ua_chan->obj; |
7972aab2 | 3259 | ua_chan->obj = NULL; |
55cc08a6 | 3260 | |
7972aab2 | 3261 | return 0; |
55cc08a6 DG |
3262 | |
3263 | error: | |
3273699d FD |
3264 | buffer_reg_channel_remove(reg_sess, buf_reg_chan); |
3265 | buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
3266 | return ret; |
3267 | } | |
3268 | ||
edb67388 | 3269 | /* |
7972aab2 | 3270 | * Send buffer registry channel to the application. |
d0b96690 | 3271 | * |
7972aab2 | 3272 | * Return 0 on success else a negative value. |
edb67388 | 3273 | */ |
3273699d | 3274 | static int send_channel_uid_to_ust(struct buffer_reg_channel *buf_reg_chan, |
7972aab2 DG |
3275 | struct ust_app *app, struct ust_app_session *ua_sess, |
3276 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
3277 | { |
3278 | int ret; | |
7972aab2 | 3279 | struct buffer_reg_stream *reg_stream; |
edb67388 | 3280 | |
3273699d | 3281 | assert(buf_reg_chan); |
7972aab2 DG |
3282 | assert(app); |
3283 | assert(ua_sess); | |
3284 | assert(ua_chan); | |
3285 | ||
3286 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
3287 | ||
3273699d | 3288 | ret = duplicate_channel_object(buf_reg_chan, ua_chan); |
edb67388 DG |
3289 | if (ret < 0) { |
3290 | goto error; | |
3291 | } | |
3292 | ||
7972aab2 DG |
3293 | /* Send channel to the application. */ |
3294 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
3295 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3296 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
3297 | goto error; | |
569744c5 JR |
3298 | } else if (ret == -EAGAIN) { |
3299 | /* Caused by timeout. */ | |
3300 | WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".", | |
3301 | app->pid, ua_chan->name, ua_sess->tracing_id); | |
3302 | /* Treat this the same way as an application that is exiting. */ | |
3303 | ret = -ENOTCONN; | |
3304 | goto error; | |
a7169585 | 3305 | } else if (ret < 0) { |
7972aab2 DG |
3306 | goto error; |
3307 | } | |
3308 | ||
3309 | health_code_update(); | |
3310 | ||
3311 | /* Send all streams to application. */ | |
3273699d FD |
3312 | pthread_mutex_lock(&buf_reg_chan->stream_list_lock); |
3313 | cds_list_for_each_entry(reg_stream, &buf_reg_chan->streams, lnode) { | |
491d2deb | 3314 | struct ust_app_stream stream = {}; |
7972aab2 DG |
3315 | |
3316 | ret = duplicate_stream_object(reg_stream, &stream); | |
3317 | if (ret < 0) { | |
3318 | goto error_stream_unlock; | |
3319 | } | |
3320 | ||
3321 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
3322 | if (ret < 0) { | |
a7169585 MD |
3323 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3324 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
569744c5 JR |
3325 | } else if (ret == -EAGAIN) { |
3326 | /* | |
3327 | * Caused by timeout. | |
3328 | * Treat this the same way as an application | |
3329 | * that is exiting. | |
3330 | */ | |
491d2deb JG |
3331 | WARN("Communication with application %d timed out on send_stream for stream of channel \"%s\" of session \"%" PRIu64 "\".", |
3332 | app->pid, | |
569744c5 JR |
3333 | ua_chan->name, |
3334 | ua_sess->tracing_id); | |
3335 | ret = -ENOTCONN; | |
a7169585 | 3336 | } |
569744c5 | 3337 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3338 | goto error_stream_unlock; |
3339 | } | |
edb67388 | 3340 | |
7972aab2 DG |
3341 | /* |
3342 | * The return value is not important here. This function will output an | |
3343 | * error if needed. | |
3344 | */ | |
fb45065e | 3345 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3346 | } |
3347 | ua_chan->is_sent = 1; | |
3348 | ||
3349 | error_stream_unlock: | |
3273699d | 3350 | pthread_mutex_unlock(&buf_reg_chan->stream_list_lock); |
edb67388 DG |
3351 | error: |
3352 | return ret; | |
3353 | } | |
3354 | ||
9730260e | 3355 | /* |
7972aab2 DG |
3356 | * Create and send to the application the created buffers with per UID buffers. |
3357 | * | |
9acdc1d6 | 3358 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3359 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3360 | * |
7972aab2 | 3361 | * Return 0 on success else a negative value. |
9730260e | 3362 | */ |
7972aab2 DG |
3363 | static int create_channel_per_uid(struct ust_app *app, |
3364 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3365 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3366 | { |
3367 | int ret; | |
7972aab2 | 3368 | struct buffer_reg_uid *reg_uid; |
3273699d | 3369 | struct buffer_reg_channel *buf_reg_chan; |
e32d7f27 | 3370 | struct ltt_session *session = NULL; |
e098433c | 3371 | enum lttng_error_code notification_ret; |
3273699d | 3372 | struct ust_registry_channel *ust_reg_chan; |
9730260e | 3373 | |
7972aab2 DG |
3374 | assert(app); |
3375 | assert(usess); | |
3376 | assert(ua_sess); | |
3377 | assert(ua_chan); | |
3378 | ||
3379 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3380 | ||
3381 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3382 | /* | |
3383 | * The session creation handles the creation of this global registry | |
3384 | * object. If none can be find, there is a code flow problem or a | |
3385 | * teardown race. | |
3386 | */ | |
3387 | assert(reg_uid); | |
3388 | ||
3273699d | 3389 | buf_reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, |
7972aab2 | 3390 | reg_uid); |
3273699d | 3391 | if (buf_reg_chan) { |
2721f7ea JG |
3392 | goto send_channel; |
3393 | } | |
7972aab2 | 3394 | |
2721f7ea | 3395 | /* Create the buffer registry channel object. */ |
3273699d | 3396 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &buf_reg_chan); |
2721f7ea JG |
3397 | if (ret < 0) { |
3398 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3399 | ua_chan->name); |
2721f7ea JG |
3400 | goto error; |
3401 | } | |
f14256d6 | 3402 | |
e098433c JG |
3403 | session = session_find_by_id(ua_sess->tracing_id); |
3404 | assert(session); | |
3405 | assert(pthread_mutex_trylock(&session->lock)); | |
3406 | assert(session_trylock_list()); | |
3407 | ||
2721f7ea JG |
3408 | /* |
3409 | * Create the buffers on the consumer side. This call populates the | |
3410 | * ust app channel object with all streams and data object. | |
3411 | */ | |
3412 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3413 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3414 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3415 | if (ret < 0) { |
3416 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3417 | ua_chan->name); | |
7972aab2 DG |
3418 | |
3419 | /* | |
2721f7ea JG |
3420 | * Let's remove the previously created buffer registry channel so |
3421 | * it's not visible anymore in the session registry. | |
7972aab2 | 3422 | */ |
2721f7ea JG |
3423 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3424 | ua_chan->tracing_channel_id, false); | |
3273699d FD |
3425 | buffer_reg_channel_remove(reg_uid->registry, buf_reg_chan); |
3426 | buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); | |
2721f7ea | 3427 | goto error; |
7972aab2 DG |
3428 | } |
3429 | ||
2721f7ea JG |
3430 | /* |
3431 | * Setup the streams and add it to the session registry. | |
3432 | */ | |
3433 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3273699d | 3434 | ua_chan, buf_reg_chan, app); |
2721f7ea JG |
3435 | if (ret < 0) { |
3436 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3437 | goto error; | |
3438 | } | |
3439 | ||
e098433c JG |
3440 | /* Notify the notification subsystem of the channel's creation. */ |
3441 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3273699d | 3442 | ust_reg_chan = ust_registry_channel_find(reg_uid->registry->reg.ust, |
e098433c | 3443 | ua_chan->tracing_channel_id); |
3273699d FD |
3444 | assert(ust_reg_chan); |
3445 | ust_reg_chan->consumer_key = ua_chan->key; | |
3446 | ust_reg_chan = NULL; | |
e098433c | 3447 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); |
e9404c27 | 3448 | |
e098433c | 3449 | notification_ret = notification_thread_command_add_channel( |
412d7227 SM |
3450 | the_notification_thread_handle, session->name, |
3451 | lttng_credentials_get_uid( | |
3452 | &ua_sess->effective_credentials), | |
3453 | lttng_credentials_get_gid( | |
3454 | &ua_sess->effective_credentials), | |
3455 | ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST, | |
e098433c JG |
3456 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3457 | if (notification_ret != LTTNG_OK) { | |
3458 | ret = - (int) notification_ret; | |
3459 | ERR("Failed to add channel to notification thread"); | |
3460 | goto error; | |
e9404c27 JG |
3461 | } |
3462 | ||
2721f7ea | 3463 | send_channel: |
66ff8e3f | 3464 | /* Send buffers to the application. */ |
3273699d | 3465 | ret = send_channel_uid_to_ust(buf_reg_chan, app, ua_sess, ua_chan); |
66ff8e3f JG |
3466 | if (ret < 0) { |
3467 | if (ret != -ENOTCONN) { | |
3468 | ERR("Error sending channel to application"); | |
3469 | } | |
3470 | goto error; | |
3471 | } | |
3472 | ||
9730260e | 3473 | error: |
e32d7f27 JG |
3474 | if (session) { |
3475 | session_put(session); | |
3476 | } | |
9730260e DG |
3477 | return ret; |
3478 | } | |
3479 | ||
78f0bacd | 3480 | /* |
7972aab2 DG |
3481 | * Create and send to the application the created buffers with per PID buffers. |
3482 | * | |
fad1ed2f | 3483 | * Called with UST app session lock held. |
71e0a100 | 3484 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3485 | * |
7972aab2 | 3486 | * Return 0 on success else a negative value. |
78f0bacd | 3487 | */ |
7972aab2 DG |
3488 | static int create_channel_per_pid(struct ust_app *app, |
3489 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3490 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3491 | { |
8535a6d9 | 3492 | int ret; |
7972aab2 | 3493 | struct ust_registry_session *registry; |
e9404c27 | 3494 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3495 | struct ltt_session *session = NULL; |
e9404c27 | 3496 | uint64_t chan_reg_key; |
3273699d | 3497 | struct ust_registry_channel *ust_reg_chan; |
78f0bacd | 3498 | |
7972aab2 DG |
3499 | assert(app); |
3500 | assert(usess); | |
3501 | assert(ua_sess); | |
3502 | assert(ua_chan); | |
3503 | ||
3504 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3505 | ||
3506 | rcu_read_lock(); | |
3507 | ||
3508 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3509 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
3510 | assert(registry); |
3511 | ||
3512 | /* Create and add a new channel registry to session. */ | |
3513 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3514 | if (ret < 0) { |
f14256d6 MD |
3515 | ERR("Error creating the UST channel \"%s\" registry instance", |
3516 | ua_chan->name); | |
78f0bacd DG |
3517 | goto error; |
3518 | } | |
3519 | ||
e098433c JG |
3520 | session = session_find_by_id(ua_sess->tracing_id); |
3521 | assert(session); | |
3522 | ||
3523 | assert(pthread_mutex_trylock(&session->lock)); | |
3524 | assert(session_trylock_list()); | |
3525 | ||
7972aab2 DG |
3526 | /* Create and get channel on the consumer side. */ |
3527 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3528 | app->bits_per_long, registry, |
d2956687 | 3529 | session->most_recent_chunk_id.value); |
7972aab2 | 3530 | if (ret < 0) { |
f14256d6 MD |
3531 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3532 | ua_chan->name); | |
5b951542 | 3533 | goto error_remove_from_registry; |
7972aab2 DG |
3534 | } |
3535 | ||
3536 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3537 | if (ret < 0) { | |
a7169585 MD |
3538 | if (ret != -ENOTCONN) { |
3539 | ERR("Error sending channel to application"); | |
3540 | } | |
5b951542 | 3541 | goto error_remove_from_registry; |
7972aab2 | 3542 | } |
8535a6d9 | 3543 | |
e9404c27 JG |
3544 | chan_reg_key = ua_chan->key; |
3545 | pthread_mutex_lock(®istry->lock); | |
3273699d FD |
3546 | ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key); |
3547 | assert(ust_reg_chan); | |
3548 | ust_reg_chan->consumer_key = ua_chan->key; | |
e9404c27 JG |
3549 | pthread_mutex_unlock(®istry->lock); |
3550 | ||
3551 | cmd_ret = notification_thread_command_add_channel( | |
412d7227 SM |
3552 | the_notification_thread_handle, session->name, |
3553 | lttng_credentials_get_uid( | |
3554 | &ua_sess->effective_credentials), | |
3555 | lttng_credentials_get_gid( | |
3556 | &ua_sess->effective_credentials), | |
3557 | ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST, | |
e9404c27 JG |
3558 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3559 | if (cmd_ret != LTTNG_OK) { | |
3560 | ret = - (int) cmd_ret; | |
3561 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3562 | goto error_remove_from_registry; |
e9404c27 JG |
3563 | } |
3564 | ||
5b951542 MD |
3565 | error_remove_from_registry: |
3566 | if (ret) { | |
3567 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3568 | } | |
78f0bacd | 3569 | error: |
7972aab2 | 3570 | rcu_read_unlock(); |
e32d7f27 JG |
3571 | if (session) { |
3572 | session_put(session); | |
3573 | } | |
78f0bacd DG |
3574 | return ret; |
3575 | } | |
3576 | ||
3577 | /* | |
7972aab2 | 3578 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3579 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3580 | * side lock acquired. |
3581 | * | |
fad1ed2f JR |
3582 | * Called with UST app session lock held. |
3583 | * | |
a7169585 MD |
3584 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3585 | * the application exited concurrently. | |
78f0bacd | 3586 | */ |
88e3c2f5 | 3587 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3588 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3589 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3590 | { |
7972aab2 | 3591 | int ret; |
78f0bacd | 3592 | |
7972aab2 DG |
3593 | assert(app); |
3594 | assert(usess); | |
88e3c2f5 | 3595 | assert(usess->active); |
7972aab2 DG |
3596 | assert(ua_sess); |
3597 | assert(ua_chan); | |
3598 | ||
3599 | /* Handle buffer type before sending the channel to the application. */ | |
3600 | switch (usess->buffer_type) { | |
3601 | case LTTNG_BUFFER_PER_UID: | |
3602 | { | |
3603 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3604 | if (ret < 0) { | |
3605 | goto error; | |
3606 | } | |
3607 | break; | |
3608 | } | |
3609 | case LTTNG_BUFFER_PER_PID: | |
3610 | { | |
3611 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3612 | if (ret < 0) { | |
3613 | goto error; | |
3614 | } | |
3615 | break; | |
3616 | } | |
3617 | default: | |
3618 | assert(0); | |
3619 | ret = -EINVAL; | |
78f0bacd DG |
3620 | goto error; |
3621 | } | |
3622 | ||
7972aab2 DG |
3623 | /* Initialize ust objd object using the received handle and add it. */ |
3624 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3625 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3626 | |
7972aab2 DG |
3627 | /* If channel is not enabled, disable it on the tracer */ |
3628 | if (!ua_chan->enabled) { | |
3629 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3630 | if (ret < 0) { | |
3631 | goto error; | |
3632 | } | |
78f0bacd DG |
3633 | } |
3634 | ||
3635 | error: | |
3636 | return ret; | |
3637 | } | |
3638 | ||
284d8f55 | 3639 | /* |
88e3c2f5 | 3640 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3641 | * |
36b588ed | 3642 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3643 | * |
88e3c2f5 | 3644 | * Return 0 on success or else a negative value. |
284d8f55 | 3645 | */ |
88e3c2f5 JG |
3646 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3647 | struct ltt_ust_channel *uchan, | |
fc4b93fa | 3648 | enum lttng_ust_abi_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3649 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3650 | { |
3651 | int ret = 0; | |
bec39940 DG |
3652 | struct lttng_ht_iter iter; |
3653 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3654 | struct ust_app_channel *ua_chan; |
3655 | ||
3656 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3657 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3658 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3659 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3660 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3661 | goto end; |
5b4a0ec0 DG |
3662 | } |
3663 | ||
d0b96690 | 3664 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3665 | if (ua_chan == NULL) { |
3666 | /* Only malloc can fail here */ | |
4d710ac2 | 3667 | ret = -ENOMEM; |
88e3c2f5 | 3668 | goto error; |
fc34caaa DG |
3669 | } |
3670 | shadow_copy_channel(ua_chan, uchan); | |
3671 | ||
ffe60014 DG |
3672 | /* Set channel type. */ |
3673 | ua_chan->attr.type = type; | |
3674 | ||
d0b96690 DG |
3675 | /* Only add the channel if successful on the tracer side. */ |
3676 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3677 | end: |
4d710ac2 DG |
3678 | if (ua_chanp) { |
3679 | *ua_chanp = ua_chan; | |
3680 | } | |
3681 | ||
3682 | /* Everything went well. */ | |
3683 | return 0; | |
5b4a0ec0 DG |
3684 | |
3685 | error: | |
4d710ac2 | 3686 | return ret; |
5b4a0ec0 DG |
3687 | } |
3688 | ||
3689 | /* | |
3690 | * Create UST app event and create it on the tracer side. | |
d0b96690 | 3691 | * |
993578ff | 3692 | * Must be called with the RCU read side lock held. |
d0b96690 | 3693 | * Called with ust app session mutex held. |
5b4a0ec0 | 3694 | */ |
edb67388 DG |
3695 | static |
3696 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3697 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3698 | struct ust_app *app) | |
284d8f55 | 3699 | { |
edb67388 | 3700 | int ret = 0; |
5b4a0ec0 | 3701 | struct ust_app_event *ua_event; |
284d8f55 | 3702 | |
edb67388 DG |
3703 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3704 | if (ua_event == NULL) { | |
20533947 | 3705 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3706 | ret = -ENOMEM; |
fc34caaa | 3707 | goto end; |
5b4a0ec0 | 3708 | } |
edb67388 | 3709 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3710 | |
edb67388 | 3711 | /* Create it on the tracer side */ |
5b4a0ec0 | 3712 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3713 | if (ret < 0) { |
e9f11505 JG |
3714 | /* |
3715 | * Not found previously means that it does not exist on the | |
3716 | * tracer. If the application reports that the event existed, | |
3717 | * it means there is a bug in the sessiond or lttng-ust | |
3718 | * (or corruption, etc.) | |
3719 | */ | |
3720 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3721 | ERR("Tracer for application reported that an event being created already existed: " | |
3722 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3723 | uevent->attr.name, | |
3724 | app->pid, app->ppid, app->uid, | |
3725 | app->gid); | |
3726 | } | |
284d8f55 DG |
3727 | goto error; |
3728 | } | |
3729 | ||
d0b96690 | 3730 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3731 | |
569744c5 JR |
3732 | DBG2("UST app create event completed: app = '%s' pid = %d", |
3733 | app->name, app->pid); | |
7f79d3a1 | 3734 | |
edb67388 | 3735 | end: |
fc34caaa DG |
3736 | return ret; |
3737 | ||
5b4a0ec0 | 3738 | error: |
fc34caaa | 3739 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3740 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3741 | return ret; |
5b4a0ec0 DG |
3742 | } |
3743 | ||
993578ff JR |
3744 | /* |
3745 | * Create UST app event notifier rule and create it on the tracer side. | |
3746 | * | |
3747 | * Must be called with the RCU read side lock held. | |
3748 | * Called with ust app session mutex held. | |
3749 | */ | |
3750 | static | |
267d66aa JR |
3751 | int create_ust_app_event_notifier_rule(struct lttng_trigger *trigger, |
3752 | struct ust_app *app) | |
993578ff JR |
3753 | { |
3754 | int ret = 0; | |
3755 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
3756 | ||
267d66aa | 3757 | ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(trigger); |
993578ff JR |
3758 | if (ua_event_notifier_rule == NULL) { |
3759 | ret = -ENOMEM; | |
3760 | goto end; | |
3761 | } | |
3762 | ||
3763 | /* Create it on the tracer side. */ | |
3764 | ret = create_ust_event_notifier(app, ua_event_notifier_rule); | |
3765 | if (ret < 0) { | |
3766 | /* | |
3767 | * Not found previously means that it does not exist on the | |
3768 | * tracer. If the application reports that the event existed, | |
3769 | * it means there is a bug in the sessiond or lttng-ust | |
3770 | * (or corruption, etc.) | |
3771 | */ | |
3772 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3773 | ERR("Tracer for application reported that an event notifier being created already exists: " | |
3774 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
267d66aa | 3775 | lttng_trigger_get_tracer_token(trigger), |
993578ff JR |
3776 | app->pid, app->ppid, app->uid, |
3777 | app->gid); | |
3778 | } | |
3779 | goto error; | |
3780 | } | |
3781 | ||
3782 | lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht, | |
3783 | &ua_event_notifier_rule->node); | |
3784 | ||
569744c5 JR |
3785 | DBG2("UST app create token event rule completed: app = '%s', pid = %d), token = %" PRIu64, |
3786 | app->name, app->pid, lttng_trigger_get_tracer_token(trigger)); | |
993578ff | 3787 | |
533a90fb | 3788 | goto end; |
993578ff JR |
3789 | |
3790 | error: | |
3791 | /* The RCU read side lock is already being held by the caller. */ | |
3792 | delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app); | |
533a90fb | 3793 | end: |
993578ff JR |
3794 | return ret; |
3795 | } | |
3796 | ||
5b4a0ec0 DG |
3797 | /* |
3798 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3799 | * |
7972aab2 | 3800 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3801 | */ |
3802 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3803 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3804 | { |
3805 | int ret = 0; | |
ffe60014 | 3806 | struct ust_app_channel *metadata; |
d88aee68 | 3807 | struct consumer_socket *socket; |
7972aab2 | 3808 | struct ust_registry_session *registry; |
e32d7f27 | 3809 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3810 | |
ffe60014 DG |
3811 | assert(ua_sess); |
3812 | assert(app); | |
d88aee68 | 3813 | assert(consumer); |
5b4a0ec0 | 3814 | |
7972aab2 | 3815 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3816 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3817 | assert(registry); |
3818 | ||
ce34fcd0 MD |
3819 | pthread_mutex_lock(®istry->lock); |
3820 | ||
1b532a60 DG |
3821 | /* Metadata already exists for this registry or it was closed previously */ |
3822 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3823 | ret = 0; |
3824 | goto error; | |
5b4a0ec0 DG |
3825 | } |
3826 | ||
ffe60014 | 3827 | /* Allocate UST metadata */ |
d0b96690 | 3828 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3829 | if (!metadata) { |
3830 | /* malloc() failed */ | |
3831 | ret = -ENOMEM; | |
3832 | goto error; | |
3833 | } | |
5b4a0ec0 | 3834 | |
ad7a9107 | 3835 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3836 | |
7972aab2 DG |
3837 | /* Need one fd for the channel. */ |
3838 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3839 | if (ret < 0) { | |
3840 | ERR("Exhausted number of available FD upon create metadata"); | |
3841 | goto error; | |
3842 | } | |
3843 | ||
4dc3dfc5 DG |
3844 | /* Get the right consumer socket for the application. */ |
3845 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3846 | if (!socket) { | |
3847 | ret = -EINVAL; | |
3848 | goto error_consumer; | |
3849 | } | |
3850 | ||
331744e3 JD |
3851 | /* |
3852 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3853 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3854 | * consumer requesting the metadata and the ask_channel call on our side | |
3855 | * did not returned yet. | |
3856 | */ | |
3857 | registry->metadata_key = metadata->key; | |
3858 | ||
e098433c JG |
3859 | session = session_find_by_id(ua_sess->tracing_id); |
3860 | assert(session); | |
3861 | ||
3862 | assert(pthread_mutex_trylock(&session->lock)); | |
3863 | assert(session_trylock_list()); | |
3864 | ||
d88aee68 DG |
3865 | /* |
3866 | * Ask the metadata channel creation to the consumer. The metadata object | |
3867 | * will be created by the consumer and kept their. However, the stream is | |
3868 | * never added or monitored until we do a first push metadata to the | |
3869 | * consumer. | |
3870 | */ | |
7972aab2 | 3871 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3872 | registry, session->current_trace_chunk); |
d88aee68 | 3873 | if (ret < 0) { |
f2a444f1 DG |
3874 | /* Nullify the metadata key so we don't try to close it later on. */ |
3875 | registry->metadata_key = 0; | |
d88aee68 DG |
3876 | goto error_consumer; |
3877 | } | |
3878 | ||
3879 | /* | |
3880 | * The setup command will make the metadata stream be sent to the relayd, | |
3881 | * if applicable, and the thread managing the metadatas. This is important | |
3882 | * because after this point, if an error occurs, the only way the stream | |
3883 | * can be deleted is to be monitored in the consumer. | |
3884 | */ | |
7972aab2 | 3885 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3886 | if (ret < 0) { |
f2a444f1 DG |
3887 | /* Nullify the metadata key so we don't try to close it later on. */ |
3888 | registry->metadata_key = 0; | |
d88aee68 | 3889 | goto error_consumer; |
5b4a0ec0 DG |
3890 | } |
3891 | ||
7972aab2 DG |
3892 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3893 | metadata->key, app->pid); | |
5b4a0ec0 | 3894 | |
d88aee68 | 3895 | error_consumer: |
b80f0b6c | 3896 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3897 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3898 | error: |
ce34fcd0 | 3899 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3900 | if (session) { |
3901 | session_put(session); | |
3902 | } | |
ffe60014 | 3903 | return ret; |
5b4a0ec0 DG |
3904 | } |
3905 | ||
5b4a0ec0 | 3906 | /* |
d88aee68 DG |
3907 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3908 | * acquired before calling this function. | |
5b4a0ec0 DG |
3909 | */ |
3910 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3911 | { | |
d88aee68 | 3912 | struct ust_app *app = NULL; |
bec39940 DG |
3913 | struct lttng_ht_node_ulong *node; |
3914 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3915 | |
bec39940 DG |
3916 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3917 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3918 | if (node == NULL) { |
3919 | DBG2("UST app no found with pid %d", pid); | |
3920 | goto error; | |
3921 | } | |
5b4a0ec0 DG |
3922 | |
3923 | DBG2("Found UST app by pid %d", pid); | |
3924 | ||
d88aee68 | 3925 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3926 | |
3927 | error: | |
d88aee68 | 3928 | return app; |
5b4a0ec0 DG |
3929 | } |
3930 | ||
d88aee68 DG |
3931 | /* |
3932 | * Allocate and init an UST app object using the registration information and | |
3933 | * the command socket. This is called when the command socket connects to the | |
3934 | * session daemon. | |
3935 | * | |
3936 | * The object is returned on success or else NULL. | |
3937 | */ | |
d0b96690 | 3938 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3939 | { |
5e2abfaf | 3940 | int ret; |
d0b96690 | 3941 | struct ust_app *lta = NULL; |
da873412 | 3942 | struct lttng_pipe *event_notifier_event_source_pipe = NULL; |
d0b96690 DG |
3943 | |
3944 | assert(msg); | |
3945 | assert(sock >= 0); | |
3946 | ||
3947 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3948 | |
173af62f | 3949 | if ((msg->bits_per_long == 64 && |
412d7227 SM |
3950 | (uatomic_read(&the_ust_consumerd64_fd) == |
3951 | -EINVAL)) || | |
3952 | (msg->bits_per_long == 32 && | |
3953 | (uatomic_read(&the_ust_consumerd32_fd) == | |
3954 | -EINVAL))) { | |
f943b0fb | 3955 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3956 | "%d-bit long, but no consumerd for this size is available.\n", |
3957 | msg->name, msg->pid, msg->bits_per_long); | |
3958 | goto error; | |
3f2c5fcc | 3959 | } |
d0b96690 | 3960 | |
5e2abfaf JG |
3961 | /* |
3962 | * Reserve the two file descriptors of the event source pipe. The write | |
3963 | * end will be closed once it is passed to the application, at which | |
3964 | * point a single 'put' will be performed. | |
3965 | */ | |
3966 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
3967 | if (ret) { | |
569744c5 JR |
3968 | ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s', pid = %d", |
3969 | msg->name, (int) msg->pid); | |
5e2abfaf JG |
3970 | goto error; |
3971 | } | |
3972 | ||
da873412 JR |
3973 | event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3974 | if (!event_notifier_event_source_pipe) { | |
569744c5 JR |
3975 | PERROR("Failed to open application event source pipe: '%s' (pid = %d)", |
3976 | msg->name, msg->pid); | |
da873412 JR |
3977 | goto error; |
3978 | } | |
3979 | ||
5b4a0ec0 DG |
3980 | lta = zmalloc(sizeof(struct ust_app)); |
3981 | if (lta == NULL) { | |
3982 | PERROR("malloc"); | |
da873412 | 3983 | goto error_free_pipe; |
5b4a0ec0 DG |
3984 | } |
3985 | ||
3faa1e3d JG |
3986 | urcu_ref_init(<a->ref); |
3987 | ||
da873412 JR |
3988 | lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe; |
3989 | ||
5b4a0ec0 DG |
3990 | lta->ppid = msg->ppid; |
3991 | lta->uid = msg->uid; | |
3992 | lta->gid = msg->gid; | |
d0b96690 | 3993 | |
7753dea8 | 3994 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3995 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3996 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3997 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3998 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3999 | lta->long_alignment = msg->long_alignment; | |
4000 | lta->byte_order = msg->byte_order; | |
4001 | ||
5b4a0ec0 DG |
4002 | lta->v_major = msg->major; |
4003 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 4004 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 4005 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 4006 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 4007 | lta->notify_sock = -1; |
993578ff | 4008 | lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
4009 | |
4010 | /* Copy name and make sure it's NULL terminated. */ | |
4011 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
4012 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
4013 | ||
4014 | /* | |
4015 | * Before this can be called, when receiving the registration information, | |
4016 | * the application compatibility is checked. So, at this point, the | |
4017 | * application can work with this session daemon. | |
4018 | */ | |
d0b96690 | 4019 | lta->compatible = 1; |
5b4a0ec0 | 4020 | |
852d0037 | 4021 | lta->pid = msg->pid; |
d0b96690 | 4022 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 4023 | lta->sock = sock; |
fb45065e | 4024 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 4025 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 4026 | |
d42f20df | 4027 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 | 4028 | return lta; |
da873412 JR |
4029 | |
4030 | error_free_pipe: | |
4031 | lttng_pipe_destroy(event_notifier_event_source_pipe); | |
5e2abfaf | 4032 | lttng_fd_put(LTTNG_FD_APPS, 2); |
da873412 JR |
4033 | error: |
4034 | return NULL; | |
d0b96690 DG |
4035 | } |
4036 | ||
d88aee68 DG |
4037 | /* |
4038 | * For a given application object, add it to every hash table. | |
4039 | */ | |
d0b96690 DG |
4040 | void ust_app_add(struct ust_app *app) |
4041 | { | |
4042 | assert(app); | |
4043 | assert(app->notify_sock >= 0); | |
4044 | ||
940c4592 JR |
4045 | app->registration_time = time(NULL); |
4046 | ||
5b4a0ec0 | 4047 | rcu_read_lock(); |
852d0037 DG |
4048 | |
4049 | /* | |
4050 | * On a re-registration, we want to kick out the previous registration of | |
4051 | * that pid | |
4052 | */ | |
d0b96690 | 4053 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
4054 | |
4055 | /* | |
4056 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
4057 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
4058 | * already in the table. | |
4059 | */ | |
d0b96690 | 4060 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 4061 | |
d0b96690 DG |
4062 | /* Add application to the notify socket hash table. */ |
4063 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
4064 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 4065 | |
569744c5 JR |
4066 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock =%d name:%s " |
4067 | "notify_sock =%d (version %d.%d)", app->pid, app->ppid, app->uid, | |
d88aee68 DG |
4068 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, |
4069 | app->v_minor); | |
5b4a0ec0 | 4070 | |
d0b96690 DG |
4071 | rcu_read_unlock(); |
4072 | } | |
4073 | ||
d88aee68 DG |
4074 | /* |
4075 | * Set the application version into the object. | |
4076 | * | |
4077 | * Return 0 on success else a negative value either an errno code or a | |
4078 | * LTTng-UST error code. | |
4079 | */ | |
d0b96690 DG |
4080 | int ust_app_version(struct ust_app *app) |
4081 | { | |
d88aee68 DG |
4082 | int ret; |
4083 | ||
d0b96690 | 4084 | assert(app); |
d88aee68 | 4085 | |
fb45065e | 4086 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 4087 | ret = lttng_ust_ctl_tracer_version(app->sock, &app->version); |
fb45065e | 4088 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 | 4089 | if (ret < 0) { |
569744c5 JR |
4090 | if (ret == -LTTNG_UST_ERR_EXITING || ret == -EPIPE) { |
4091 | DBG3("UST app version failed. Application is dead: pid = %d, sock = %d", | |
4092 | app->pid, app->sock); | |
4093 | } else if (ret == -EAGAIN) { | |
4094 | WARN("UST app version failed. Communication time out: pid = %d, sock = %d", | |
4095 | app->pid, app->sock); | |
d88aee68 | 4096 | } else { |
569744c5 JR |
4097 | ERR("UST app version failed with ret %d: pid = %d, sock = %d", |
4098 | ret, app->pid, app->sock); | |
d88aee68 DG |
4099 | } |
4100 | } | |
4101 | ||
4102 | return ret; | |
5b4a0ec0 DG |
4103 | } |
4104 | ||
27a3be48 MD |
4105 | bool ust_app_supports_notifiers(const struct ust_app *app) |
4106 | { | |
4107 | return app->v_major >= 9; | |
4108 | } | |
4109 | ||
4110 | bool ust_app_supports_counters(const struct ust_app *app) | |
4111 | { | |
4112 | return app->v_major >= 9; | |
4113 | } | |
4114 | ||
da873412 JR |
4115 | /* |
4116 | * Setup the base event notifier group. | |
4117 | * | |
4118 | * Return 0 on success else a negative value either an errno code or a | |
4119 | * LTTng-UST error code. | |
4120 | */ | |
4121 | int ust_app_setup_event_notifier_group(struct ust_app *app) | |
4122 | { | |
4123 | int ret; | |
4124 | int event_pipe_write_fd; | |
fc4b93fa | 4125 | struct lttng_ust_abi_object_data *event_notifier_group = NULL; |
da873412 | 4126 | enum lttng_error_code lttng_ret; |
533a90fb | 4127 | enum event_notifier_error_accounting_status event_notifier_error_accounting_status; |
da873412 JR |
4128 | |
4129 | assert(app); | |
4130 | ||
27a3be48 MD |
4131 | if (!ust_app_supports_notifiers(app)) { |
4132 | ret = -ENOSYS; | |
4133 | goto error; | |
4134 | } | |
4135 | ||
da873412 JR |
4136 | /* Get the write side of the pipe. */ |
4137 | event_pipe_write_fd = lttng_pipe_get_writefd( | |
4138 | app->event_notifier_group.event_pipe); | |
4139 | ||
4140 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 4141 | ret = lttng_ust_ctl_create_event_notifier_group(app->sock, |
da873412 JR |
4142 | event_pipe_write_fd, &event_notifier_group); |
4143 | pthread_mutex_unlock(&app->sock_lock); | |
4144 | if (ret < 0) { | |
569744c5 JR |
4145 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
4146 | ret = 0; | |
4147 | DBG3("UST app create event notifier group failed. Application is dead: pid = %d, sock = %d", | |
4148 | app->pid, app->sock); | |
4149 | } else if (ret == -EAGAIN) { | |
4150 | ret = 0; | |
4151 | WARN("UST app create event notifier group failed. Communication time out: pid = %d, sock = %d", | |
4152 | app->pid, app->sock); | |
da873412 | 4153 | } else { |
569744c5 JR |
4154 | ERR("UST app create event notifier group failed with ret %d: pid = %d, sock = %d, event_pipe_write_fd: %d", |
4155 | ret, app->pid, app->sock, event_pipe_write_fd); | |
da873412 | 4156 | } |
da873412 JR |
4157 | goto error; |
4158 | } | |
4159 | ||
5d4193fd JG |
4160 | ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe); |
4161 | if (ret) { | |
569744c5 JR |
4162 | ERR("Failed to close write end of the application's event source pipe: app = '%s' (pid = %d)", |
4163 | app->name, app->pid); | |
5d4193fd JG |
4164 | goto error; |
4165 | } | |
4166 | ||
5e2abfaf JG |
4167 | /* |
4168 | * Release the file descriptor that was reserved for the write-end of | |
4169 | * the pipe. | |
4170 | */ | |
4171 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
4172 | ||
da873412 | 4173 | lttng_ret = notification_thread_command_add_tracer_event_source( |
412d7227 SM |
4174 | the_notification_thread_handle, |
4175 | lttng_pipe_get_readfd( | |
4176 | app->event_notifier_group.event_pipe), | |
da873412 JR |
4177 | LTTNG_DOMAIN_UST); |
4178 | if (lttng_ret != LTTNG_OK) { | |
4179 | ERR("Failed to add tracer event source to notification thread"); | |
4180 | ret = - 1; | |
4181 | goto error; | |
4182 | } | |
4183 | ||
4184 | /* Assign handle only when the complete setup is valid. */ | |
4185 | app->event_notifier_group.object = event_notifier_group; | |
533a90fb | 4186 | |
a5a21280 FD |
4187 | event_notifier_error_accounting_status = |
4188 | event_notifier_error_accounting_register_app(app); | |
27a3be48 MD |
4189 | switch (event_notifier_error_accounting_status) { |
4190 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK: | |
4191 | break; | |
4192 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_UNSUPPORTED: | |
569744c5 JR |
4193 | 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", |
4194 | app->sock, app->name, (int) app->pid); | |
27a3be48 MD |
4195 | ret = 0; |
4196 | goto error_accounting; | |
4197 | case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD: | |
569744c5 JR |
4198 | DBG3("Failed to setup event notifier error accounting (application is dead): app socket fd = %d, app name = '%s', app pid = %d", |
4199 | app->sock, app->name, (int) app->pid); | |
27a3be48 MD |
4200 | ret = 0; |
4201 | goto error_accounting; | |
4202 | default: | |
533a90fb FD |
4203 | ERR("Failed to setup event notifier error accounting for app"); |
4204 | ret = -1; | |
cd9c532c | 4205 | goto error_accounting; |
533a90fb FD |
4206 | } |
4207 | ||
da873412 JR |
4208 | return ret; |
4209 | ||
cd9c532c FD |
4210 | error_accounting: |
4211 | lttng_ret = notification_thread_command_remove_tracer_event_source( | |
4212 | the_notification_thread_handle, | |
4213 | lttng_pipe_get_readfd( | |
4214 | app->event_notifier_group.event_pipe)); | |
4215 | if (lttng_ret != LTTNG_OK) { | |
4216 | ERR("Failed to remove application tracer event source from notification thread"); | |
4217 | } | |
4218 | ||
da873412 | 4219 | error: |
b623cb6a | 4220 | lttng_ust_ctl_release_object(app->sock, app->event_notifier_group.object); |
da873412 | 4221 | free(app->event_notifier_group.object); |
88631abd | 4222 | app->event_notifier_group.object = NULL; |
da873412 JR |
4223 | return ret; |
4224 | } | |
4225 | ||
3faa1e3d | 4226 | static void ust_app_unregister(struct ust_app *app) |
5b4a0ec0 | 4227 | { |
3faa1e3d | 4228 | int ret; |
bec39940 | 4229 | struct lttng_ht_iter iter; |
d42f20df | 4230 | struct ust_app_session *ua_sess; |
5b4a0ec0 DG |
4231 | |
4232 | rcu_read_lock(); | |
886459c6 | 4233 | |
d88aee68 | 4234 | /* |
ce34fcd0 MD |
4235 | * For per-PID buffers, perform "push metadata" and flush all |
4236 | * application streams before removing app from hash tables, | |
4237 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 4238 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 4239 | */ |
3faa1e3d | 4240 | cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess, |
d42f20df | 4241 | node.node) { |
7972aab2 DG |
4242 | struct ust_registry_session *registry; |
4243 | ||
3faa1e3d | 4244 | ret = lttng_ht_del(app->sessions, &iter); |
d42f20df DG |
4245 | if (ret) { |
4246 | /* The session was already removed so scheduled for teardown. */ | |
4247 | continue; | |
4248 | } | |
4249 | ||
ce34fcd0 | 4250 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3faa1e3d | 4251 | (void) ust_app_flush_app_session(app, ua_sess); |
ce34fcd0 | 4252 | } |
c4b88406 | 4253 | |
d42f20df DG |
4254 | /* |
4255 | * Add session to list for teardown. This is safe since at this point we | |
4256 | * are the only one using this list. | |
4257 | */ | |
d88aee68 DG |
4258 | pthread_mutex_lock(&ua_sess->lock); |
4259 | ||
b161602a MD |
4260 | if (ua_sess->deleted) { |
4261 | pthread_mutex_unlock(&ua_sess->lock); | |
4262 | continue; | |
4263 | } | |
4264 | ||
d88aee68 DG |
4265 | /* |
4266 | * Normally, this is done in the delete session process which is | |
4267 | * executed in the call rcu below. However, upon registration we can't | |
4268 | * afford to wait for the grace period before pushing data or else the | |
4269 | * data pending feature can race between the unregistration and stop | |
4270 | * command where the data pending command is sent *before* the grace | |
4271 | * period ended. | |
4272 | * | |
4273 | * The close metadata below nullifies the metadata pointer in the | |
4274 | * session so the delete session will NOT push/close a second time. | |
4275 | */ | |
7972aab2 | 4276 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 4277 | if (registry) { |
7972aab2 DG |
4278 | /* Push metadata for application before freeing the application. */ |
4279 | (void) push_metadata(registry, ua_sess->consumer); | |
4280 | ||
4281 | /* | |
4282 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
4283 | * metadata only on destroy trace session in this case. Also, the |
4284 | * previous push metadata could have flag the metadata registry to | |
4285 | * close so don't send a close command if closed. | |
7972aab2 | 4286 | */ |
ce34fcd0 | 4287 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
4288 | /* And ask to close it for this session registry. */ |
4289 | (void) close_metadata(registry, ua_sess->consumer); | |
4290 | } | |
4291 | } | |
c4b88406 | 4292 | |
3faa1e3d | 4293 | cds_list_add(&ua_sess->teardown_node, &app->teardown_head); |
d88aee68 | 4294 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
4295 | } |
4296 | ||
c4b88406 MD |
4297 | /* |
4298 | * Remove application from notify hash table. The thread handling the | |
4299 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
4300 | * either way it's valid. The close of that socket is handled by the |
4301 | * apps_notify_thread. | |
c4b88406 | 4302 | */ |
3faa1e3d | 4303 | iter.iter.node = &app->notify_sock_n.node; |
c4b88406 MD |
4304 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
4305 | ||
3faa1e3d | 4306 | iter.iter.node = &app->pid_n.node; |
c4b88406 MD |
4307 | ret = lttng_ht_del(ust_app_ht, &iter); |
4308 | if (ret) { | |
3faa1e3d | 4309 | WARN("Unregister app by PID %d failed", app->pid); |
c4b88406 MD |
4310 | } |
4311 | ||
3faa1e3d JG |
4312 | rcu_read_unlock(); |
4313 | } | |
4314 | ||
4315 | /* | |
4316 | * Unregister app by removing it from the global traceable app list and freeing | |
4317 | * the data struct. | |
4318 | * | |
4319 | * The socket is already closed at this point, so there is no need to close it. | |
4320 | */ | |
4321 | void ust_app_unregister_by_socket(int sock) | |
4322 | { | |
4323 | struct ust_app *app; | |
4324 | struct lttng_ht_node_ulong *node; | |
4325 | struct lttng_ht_iter ust_app_sock_iter; | |
4326 | int ret; | |
4327 | ||
4328 | rcu_read_lock(); | |
4329 | ||
4330 | /* Get the node reference for a call_rcu */ | |
4331 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); | |
4332 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
4333 | assert(node); | |
4334 | ||
4335 | app = caa_container_of(node, struct ust_app, sock_n); | |
4336 | ||
4337 | DBG("PID %d unregistering with sock %d", app->pid, sock); | |
852d0037 | 4338 | |
3faa1e3d JG |
4339 | /* Remove application from socket hash table */ |
4340 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
4341 | assert(!ret); | |
4342 | ||
4343 | /* | |
4344 | * The socket is closed: release its reference to the application | |
4345 | * to trigger its eventual teardown. | |
4346 | */ | |
4347 | ust_app_put(app); | |
5b4a0ec0 | 4348 | rcu_read_unlock(); |
284d8f55 DG |
4349 | } |
4350 | ||
5b4a0ec0 DG |
4351 | /* |
4352 | * Fill events array with all events name of all registered apps. | |
4353 | */ | |
4354 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 4355 | { |
5b4a0ec0 DG |
4356 | int ret, handle; |
4357 | size_t nbmem, count = 0; | |
bec39940 | 4358 | struct lttng_ht_iter iter; |
5b4a0ec0 | 4359 | struct ust_app *app; |
c617c0c6 | 4360 | struct lttng_event *tmp_event; |
421cb601 | 4361 | |
5b4a0ec0 | 4362 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
4363 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
4364 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
4365 | PERROR("zmalloc ust app events"); |
4366 | ret = -ENOMEM; | |
421cb601 DG |
4367 | goto error; |
4368 | } | |
4369 | ||
5b4a0ec0 | 4370 | rcu_read_lock(); |
421cb601 | 4371 | |
852d0037 | 4372 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
fc4b93fa | 4373 | struct lttng_ust_abi_tracepoint_iter uiter; |
ac3bd9c0 | 4374 | |
840cb59c | 4375 | health_code_update(); |
86acf0da | 4376 | |
e0c7ec2b DG |
4377 | if (!app->compatible) { |
4378 | /* | |
4379 | * TODO: In time, we should notice the caller of this error by | |
4380 | * telling him that this is a version error. | |
4381 | */ | |
4382 | continue; | |
4383 | } | |
fb45065e | 4384 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 4385 | handle = lttng_ust_ctl_tracepoint_list(app->sock); |
5b4a0ec0 | 4386 | if (handle < 0) { |
ffe60014 DG |
4387 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4388 | ERR("UST app list events getting handle failed for app pid %d", | |
4389 | app->pid); | |
4390 | } | |
fb45065e | 4391 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
4392 | continue; |
4393 | } | |
421cb601 | 4394 | |
b623cb6a | 4395 | while ((ret = lttng_ust_ctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 4396 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4397 | /* Handle ustctl error. */ |
4398 | if (ret < 0) { | |
fb45065e MD |
4399 | int release_ret; |
4400 | ||
a2ba1ab0 | 4401 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4402 | ERR("UST app tp list get failed for app %d with ret %d", |
4403 | app->sock, ret); | |
4404 | } else { | |
4405 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 | 4406 | break; |
ffe60014 | 4407 | } |
98f595d4 | 4408 | free(tmp_event); |
b623cb6a | 4409 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
68313703 JG |
4410 | if (release_ret < 0 && |
4411 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4412 | release_ret != -EPIPE) { | |
fb45065e MD |
4413 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4414 | } | |
4415 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
4416 | goto rcu_error; |
4417 | } | |
4418 | ||
840cb59c | 4419 | health_code_update(); |
815564d8 | 4420 | if (count >= nbmem) { |
d7b3776f | 4421 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4422 | struct lttng_event *new_tmp_event; |
4423 | size_t new_nbmem; | |
4424 | ||
4425 | new_nbmem = nbmem << 1; | |
4426 | DBG2("Reallocating event list from %zu to %zu entries", | |
4427 | nbmem, new_nbmem); | |
4428 | new_tmp_event = realloc(tmp_event, | |
4429 | new_nbmem * sizeof(struct lttng_event)); | |
4430 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4431 | int release_ret; |
4432 | ||
5b4a0ec0 | 4433 | PERROR("realloc ust app events"); |
c617c0c6 | 4434 | free(tmp_event); |
5b4a0ec0 | 4435 | ret = -ENOMEM; |
b623cb6a | 4436 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
68313703 JG |
4437 | if (release_ret < 0 && |
4438 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4439 | release_ret != -EPIPE) { | |
fb45065e MD |
4440 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4441 | } | |
4442 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
4443 | goto rcu_error; |
4444 | } | |
53efb85a MD |
4445 | /* Zero the new memory */ |
4446 | memset(new_tmp_event + nbmem, 0, | |
4447 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4448 | nbmem = new_nbmem; | |
4449 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4450 | } |
fc4b93fa | 4451 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4452 | tmp_event[count].loglevel = uiter.loglevel; |
fc4b93fa | 4453 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_ABI_TRACEPOINT; |
c617c0c6 MD |
4454 | tmp_event[count].pid = app->pid; |
4455 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4456 | count++; |
421cb601 | 4457 | } |
b623cb6a | 4458 | ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4459 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
4460 | if (ret < 0) { |
4461 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
4462 | DBG3("Error releasing app handle. Application died: pid = %d, sock = %d", | |
4463 | app->pid, app->sock); | |
4464 | } else if (ret == -EAGAIN) { | |
4465 | WARN("Error releasing app handle. Communication time out: pid = %d, sock = %d", | |
4466 | app->pid, app->sock); | |
4467 | } else { | |
4468 | ERR("Error releasing app handle with ret %d: pid = %d, sock = %d", | |
4469 | ret, app->pid, app->sock); | |
4470 | } | |
fb45065e | 4471 | } |
421cb601 DG |
4472 | } |
4473 | ||
5b4a0ec0 | 4474 | ret = count; |
c617c0c6 | 4475 | *events = tmp_event; |
421cb601 | 4476 | |
5b4a0ec0 | 4477 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4478 | |
5b4a0ec0 DG |
4479 | rcu_error: |
4480 | rcu_read_unlock(); | |
421cb601 | 4481 | error: |
840cb59c | 4482 | health_code_update(); |
5b4a0ec0 | 4483 | return ret; |
421cb601 DG |
4484 | } |
4485 | ||
f37d259d MD |
4486 | /* |
4487 | * Fill events array with all events name of all registered apps. | |
4488 | */ | |
4489 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4490 | { | |
4491 | int ret, handle; | |
4492 | size_t nbmem, count = 0; | |
4493 | struct lttng_ht_iter iter; | |
4494 | struct ust_app *app; | |
c617c0c6 | 4495 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4496 | |
4497 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
4498 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
4499 | if (tmp_event == NULL) { | |
f37d259d MD |
4500 | PERROR("zmalloc ust app event fields"); |
4501 | ret = -ENOMEM; | |
4502 | goto error; | |
4503 | } | |
4504 | ||
4505 | rcu_read_lock(); | |
4506 | ||
4507 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
fc4b93fa | 4508 | struct lttng_ust_abi_field_iter uiter; |
f37d259d | 4509 | |
840cb59c | 4510 | health_code_update(); |
86acf0da | 4511 | |
f37d259d MD |
4512 | if (!app->compatible) { |
4513 | /* | |
4514 | * TODO: In time, we should notice the caller of this error by | |
4515 | * telling him that this is a version error. | |
4516 | */ | |
4517 | continue; | |
4518 | } | |
fb45065e | 4519 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 4520 | handle = lttng_ust_ctl_tracepoint_field_list(app->sock); |
f37d259d | 4521 | if (handle < 0) { |
ffe60014 DG |
4522 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4523 | ERR("UST app list field getting handle failed for app pid %d", | |
4524 | app->pid); | |
4525 | } | |
fb45065e | 4526 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4527 | continue; |
4528 | } | |
4529 | ||
b623cb6a | 4530 | while ((ret = lttng_ust_ctl_tracepoint_field_list_get(app->sock, handle, |
fb54cdbf | 4531 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4532 | /* Handle ustctl error. */ |
4533 | if (ret < 0) { | |
fb45065e MD |
4534 | int release_ret; |
4535 | ||
a2ba1ab0 | 4536 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4537 | ERR("UST app tp list field failed for app %d with ret %d", |
4538 | app->sock, ret); | |
4539 | } else { | |
4540 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 | 4541 | break; |
ffe60014 | 4542 | } |
98f595d4 | 4543 | free(tmp_event); |
b623cb6a | 4544 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4545 | pthread_mutex_unlock(&app->sock_lock); |
68313703 JG |
4546 | if (release_ret < 0 && |
4547 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4548 | release_ret != -EPIPE) { | |
fb45065e MD |
4549 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4550 | } | |
ffe60014 DG |
4551 | goto rcu_error; |
4552 | } | |
4553 | ||
840cb59c | 4554 | health_code_update(); |
f37d259d | 4555 | if (count >= nbmem) { |
d7b3776f | 4556 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4557 | struct lttng_event_field *new_tmp_event; |
4558 | size_t new_nbmem; | |
4559 | ||
4560 | new_nbmem = nbmem << 1; | |
4561 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4562 | nbmem, new_nbmem); | |
4563 | new_tmp_event = realloc(tmp_event, | |
4564 | new_nbmem * sizeof(struct lttng_event_field)); | |
4565 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4566 | int release_ret; |
4567 | ||
f37d259d | 4568 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4569 | free(tmp_event); |
f37d259d | 4570 | ret = -ENOMEM; |
b623cb6a | 4571 | release_ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4572 | pthread_mutex_unlock(&app->sock_lock); |
68313703 JG |
4573 | if (release_ret && |
4574 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4575 | release_ret != -EPIPE) { | |
fb45065e MD |
4576 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4577 | } | |
f37d259d MD |
4578 | goto rcu_error; |
4579 | } | |
53efb85a MD |
4580 | /* Zero the new memory */ |
4581 | memset(new_tmp_event + nbmem, 0, | |
4582 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4583 | nbmem = new_nbmem; | |
4584 | tmp_event = new_tmp_event; | |
f37d259d | 4585 | } |
f37d259d | 4586 | |
fc4b93fa | 4587 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
2e84128e DG |
4588 | /* Mapping between these enums matches 1 to 1. */ |
4589 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4590 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4591 | |
fc4b93fa | 4592 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4593 | tmp_event[count].event.loglevel = uiter.loglevel; |
2e84128e | 4594 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4595 | tmp_event[count].event.pid = app->pid; |
4596 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4597 | count++; |
4598 | } | |
b623cb6a | 4599 | ret = lttng_ust_ctl_release_handle(app->sock, handle); |
fb45065e | 4600 | pthread_mutex_unlock(&app->sock_lock); |
68313703 JG |
4601 | if (ret < 0 && |
4602 | ret != -LTTNG_UST_ERR_EXITING && | |
4603 | ret != -EPIPE) { | |
fb45065e MD |
4604 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4605 | } | |
f37d259d MD |
4606 | } |
4607 | ||
4608 | ret = count; | |
c617c0c6 | 4609 | *fields = tmp_event; |
f37d259d MD |
4610 | |
4611 | DBG2("UST app list event fields done (%zu events)", count); | |
4612 | ||
4613 | rcu_error: | |
4614 | rcu_read_unlock(); | |
4615 | error: | |
840cb59c | 4616 | health_code_update(); |
f37d259d MD |
4617 | return ret; |
4618 | } | |
4619 | ||
5b4a0ec0 DG |
4620 | /* |
4621 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
4622 | * |
4623 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
4624 | */ |
4625 | void ust_app_clean_list(void) | |
421cb601 | 4626 | { |
5b4a0ec0 | 4627 | int ret; |
659ed79f | 4628 | struct ust_app *app; |
bec39940 | 4629 | struct lttng_ht_iter iter; |
421cb601 | 4630 | |
5b4a0ec0 | 4631 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4632 | |
5b4a0ec0 | 4633 | rcu_read_lock(); |
421cb601 | 4634 | |
faadaa3a JG |
4635 | /* Cleanup notify socket hash table */ |
4636 | if (ust_app_ht_by_notify_sock) { | |
4637 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4638 | notify_sock_n.node) { | |
b69a1b40 JG |
4639 | /* |
4640 | * Assert that all notifiers are gone as all triggers | |
4641 | * are unregistered prior to this clean-up. | |
4642 | */ | |
4643 | assert(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0); | |
faadaa3a JG |
4644 | ust_app_notify_sock_unregister(app->notify_sock); |
4645 | } | |
4646 | } | |
4647 | ||
852d0037 | 4648 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4649 | if (ust_app_ht_by_sock) { |
4650 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4651 | sock_n.node) { | |
4652 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
4653 | assert(!ret); | |
3faa1e3d JG |
4654 | |
4655 | ust_app_put(app); | |
f1b711c4 | 4656 | } |
bec39940 | 4657 | } |
852d0037 | 4658 | |
36b588ed | 4659 | rcu_read_unlock(); |
d88aee68 | 4660 | |
bec39940 | 4661 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4662 | if (ust_app_ht) { |
4663 | ht_cleanup_push(ust_app_ht); | |
4664 | } | |
4665 | if (ust_app_ht_by_sock) { | |
4666 | ht_cleanup_push(ust_app_ht_by_sock); | |
4667 | } | |
4668 | if (ust_app_ht_by_notify_sock) { | |
4669 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4670 | } | |
5b4a0ec0 DG |
4671 | } |
4672 | ||
4673 | /* | |
4674 | * Init UST app hash table. | |
4675 | */ | |
57703f6e | 4676 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4677 | { |
bec39940 | 4678 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4679 | if (!ust_app_ht) { |
4680 | return -1; | |
4681 | } | |
852d0037 | 4682 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4683 | if (!ust_app_ht_by_sock) { |
4684 | return -1; | |
4685 | } | |
d0b96690 | 4686 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4687 | if (!ust_app_ht_by_notify_sock) { |
4688 | return -1; | |
4689 | } | |
4690 | return 0; | |
421cb601 DG |
4691 | } |
4692 | ||
78f0bacd DG |
4693 | /* |
4694 | * For a specific UST session, disable the channel for all registered apps. | |
4695 | */ | |
35a9059d | 4696 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4697 | struct ltt_ust_channel *uchan) |
4698 | { | |
4699 | int ret = 0; | |
bec39940 DG |
4700 | struct lttng_ht_iter iter; |
4701 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4702 | struct ust_app *app; |
4703 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4704 | struct ust_app_channel *ua_chan; |
78f0bacd | 4705 | |
88e3c2f5 | 4706 | assert(usess->active); |
d9bf3ca4 | 4707 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4708 | uchan->name, usess->id); |
78f0bacd DG |
4709 | |
4710 | rcu_read_lock(); | |
4711 | ||
4712 | /* For every registered applications */ | |
852d0037 | 4713 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4714 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4715 | if (!app->compatible) { |
4716 | /* | |
4717 | * TODO: In time, we should notice the caller of this error by | |
4718 | * telling him that this is a version error. | |
4719 | */ | |
4720 | continue; | |
4721 | } | |
78f0bacd DG |
4722 | ua_sess = lookup_session_by_app(usess, app); |
4723 | if (ua_sess == NULL) { | |
4724 | continue; | |
4725 | } | |
4726 | ||
8535a6d9 | 4727 | /* Get channel */ |
bec39940 DG |
4728 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4729 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4730 | /* If the session if found for the app, the channel must be there */ |
4731 | assert(ua_chan_node); | |
4732 | ||
4733 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4734 | /* The channel must not be already disabled */ | |
4735 | assert(ua_chan->enabled == 1); | |
4736 | ||
4737 | /* Disable channel onto application */ | |
4738 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4739 | if (ret < 0) { |
4740 | /* XXX: We might want to report this error at some point... */ | |
4741 | continue; | |
4742 | } | |
4743 | } | |
4744 | ||
4745 | rcu_read_unlock(); | |
78f0bacd DG |
4746 | return ret; |
4747 | } | |
4748 | ||
4749 | /* | |
4750 | * For a specific UST session, enable the channel for all registered apps. | |
4751 | */ | |
35a9059d | 4752 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4753 | struct ltt_ust_channel *uchan) |
4754 | { | |
4755 | int ret = 0; | |
bec39940 | 4756 | struct lttng_ht_iter iter; |
78f0bacd DG |
4757 | struct ust_app *app; |
4758 | struct ust_app_session *ua_sess; | |
4759 | ||
88e3c2f5 | 4760 | assert(usess->active); |
d9bf3ca4 | 4761 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4762 | uchan->name, usess->id); |
78f0bacd DG |
4763 | |
4764 | rcu_read_lock(); | |
4765 | ||
4766 | /* For every registered applications */ | |
852d0037 | 4767 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4768 | if (!app->compatible) { |
4769 | /* | |
4770 | * TODO: In time, we should notice the caller of this error by | |
4771 | * telling him that this is a version error. | |
4772 | */ | |
4773 | continue; | |
4774 | } | |
78f0bacd DG |
4775 | ua_sess = lookup_session_by_app(usess, app); |
4776 | if (ua_sess == NULL) { | |
4777 | continue; | |
4778 | } | |
4779 | ||
4780 | /* Enable channel onto application */ | |
4781 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4782 | if (ret < 0) { | |
4783 | /* XXX: We might want to report this error at some point... */ | |
4784 | continue; | |
4785 | } | |
4786 | } | |
4787 | ||
4788 | rcu_read_unlock(); | |
78f0bacd DG |
4789 | return ret; |
4790 | } | |
4791 | ||
b0a40d28 DG |
4792 | /* |
4793 | * Disable an event in a channel and for a specific session. | |
4794 | */ | |
35a9059d DG |
4795 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4796 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4797 | { |
4798 | int ret = 0; | |
bec39940 | 4799 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4800 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4801 | struct ust_app *app; |
4802 | struct ust_app_session *ua_sess; | |
4803 | struct ust_app_channel *ua_chan; | |
4804 | struct ust_app_event *ua_event; | |
4805 | ||
88e3c2f5 | 4806 | assert(usess->active); |
b0a40d28 | 4807 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4808 | "%s for session id %" PRIu64, |
4809 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4810 | |
4811 | rcu_read_lock(); | |
4812 | ||
4813 | /* For all registered applications */ | |
852d0037 | 4814 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4815 | if (!app->compatible) { |
4816 | /* | |
4817 | * TODO: In time, we should notice the caller of this error by | |
4818 | * telling him that this is a version error. | |
4819 | */ | |
4820 | continue; | |
4821 | } | |
b0a40d28 DG |
4822 | ua_sess = lookup_session_by_app(usess, app); |
4823 | if (ua_sess == NULL) { | |
4824 | /* Next app */ | |
4825 | continue; | |
4826 | } | |
4827 | ||
4828 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4829 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4830 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4831 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4832 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4833 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4834 | continue; |
4835 | } | |
4836 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4837 | ||
1083b49a JG |
4838 | ua_event = find_ust_app_event(ua_chan->events, |
4839 | uevent->attr.name, uevent->filter, | |
4840 | (enum lttng_ust_abi_loglevel_type) | |
4841 | uevent->attr.loglevel_type, | |
4842 | uevent->attr.loglevel, uevent->exclusion); | |
700c5a9d | 4843 | if (ua_event == NULL) { |
b0a40d28 | 4844 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4845 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4846 | continue; |
4847 | } | |
b0a40d28 | 4848 | |
7f79d3a1 | 4849 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4850 | if (ret < 0) { |
4851 | /* XXX: Report error someday... */ | |
4852 | continue; | |
4853 | } | |
4854 | } | |
4855 | ||
4856 | rcu_read_unlock(); | |
88e3c2f5 JG |
4857 | return ret; |
4858 | } | |
4859 | ||
4860 | /* The ua_sess lock must be held by the caller. */ | |
4861 | static | |
4862 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4863 | struct ust_app_session *ua_sess, | |
4864 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4865 | struct ust_app_channel **_ua_chan) | |
4866 | { | |
4867 | int ret = 0; | |
4868 | struct ust_app_channel *ua_chan = NULL; | |
4869 | ||
4870 | assert(ua_sess); | |
4871 | ASSERT_LOCKED(ua_sess->lock); | |
4872 | ||
4873 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4874 | sizeof(uchan->name))) { | |
4875 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4876 | &uchan->attr); | |
4877 | ret = 0; | |
4878 | } else { | |
4879 | struct ltt_ust_context *uctx = NULL; | |
4880 | ||
4881 | /* | |
4882 | * Create channel onto application and synchronize its | |
4883 | * configuration. | |
4884 | */ | |
4885 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
fc4b93fa | 4886 | LTTNG_UST_ABI_CHAN_PER_CPU, usess, |
88e3c2f5 | 4887 | &ua_chan); |
88ebf5a7 JR |
4888 | if (ret < 0) { |
4889 | goto error; | |
4890 | } | |
4891 | ||
4892 | ret = ust_app_channel_send(app, usess, | |
4893 | ua_sess, ua_chan); | |
4894 | if (ret) { | |
4895 | goto error; | |
88e3c2f5 JG |
4896 | } |
4897 | ||
4898 | /* Add contexts. */ | |
4899 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4900 | ret = create_ust_app_channel_context(ua_chan, | |
4901 | &uctx->ctx, app); | |
4902 | if (ret) { | |
88ebf5a7 | 4903 | goto error; |
88e3c2f5 JG |
4904 | } |
4905 | } | |
4906 | } | |
88ebf5a7 JR |
4907 | |
4908 | error: | |
88e3c2f5 JG |
4909 | if (ret < 0) { |
4910 | switch (ret) { | |
4911 | case -ENOTCONN: | |
4912 | /* | |
4913 | * The application's socket is not valid. Either a bad socket | |
4914 | * or a timeout on it. We can't inform the caller that for a | |
4915 | * specific app, the session failed so lets continue here. | |
4916 | */ | |
4917 | ret = 0; /* Not an error. */ | |
4918 | break; | |
4919 | case -ENOMEM: | |
4920 | default: | |
4921 | break; | |
4922 | } | |
4923 | } | |
88ebf5a7 | 4924 | |
88e3c2f5 JG |
4925 | if (ret == 0 && _ua_chan) { |
4926 | /* | |
4927 | * Only return the application's channel on success. Note | |
4928 | * that the channel can still be part of the application's | |
4929 | * channel hashtable on error. | |
4930 | */ | |
4931 | *_ua_chan = ua_chan; | |
4932 | } | |
b0a40d28 DG |
4933 | return ret; |
4934 | } | |
4935 | ||
5b4a0ec0 | 4936 | /* |
edb67388 | 4937 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4938 | */ |
35a9059d | 4939 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4940 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4941 | { | |
4942 | int ret = 0; | |
bec39940 | 4943 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4944 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4945 | struct ust_app *app; |
4946 | struct ust_app_session *ua_sess; | |
4947 | struct ust_app_channel *ua_chan; | |
4948 | struct ust_app_event *ua_event; | |
48842b30 | 4949 | |
88e3c2f5 | 4950 | assert(usess->active); |
d9bf3ca4 | 4951 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4952 | uevent->attr.name, usess->id); |
48842b30 | 4953 | |
edb67388 DG |
4954 | /* |
4955 | * NOTE: At this point, this function is called only if the session and | |
4956 | * channel passed are already created for all apps. and enabled on the | |
4957 | * tracer also. | |
4958 | */ | |
4959 | ||
48842b30 | 4960 | rcu_read_lock(); |
421cb601 DG |
4961 | |
4962 | /* For all registered applications */ | |
852d0037 | 4963 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4964 | if (!app->compatible) { |
4965 | /* | |
4966 | * TODO: In time, we should notice the caller of this error by | |
4967 | * telling him that this is a version error. | |
4968 | */ | |
4969 | continue; | |
4970 | } | |
edb67388 | 4971 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4972 | if (!ua_sess) { |
4973 | /* The application has problem or is probably dead. */ | |
4974 | continue; | |
4975 | } | |
ba767faf | 4976 | |
d0b96690 DG |
4977 | pthread_mutex_lock(&ua_sess->lock); |
4978 | ||
b161602a MD |
4979 | if (ua_sess->deleted) { |
4980 | pthread_mutex_unlock(&ua_sess->lock); | |
4981 | continue; | |
4982 | } | |
4983 | ||
edb67388 | 4984 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4985 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4986 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4987 | /* |
4988 | * It is possible that the channel cannot be found is | |
4989 | * the channel/event creation occurs concurrently with | |
4990 | * an application exit. | |
4991 | */ | |
4992 | if (!ua_chan_node) { | |
4993 | pthread_mutex_unlock(&ua_sess->lock); | |
4994 | continue; | |
4995 | } | |
edb67388 DG |
4996 | |
4997 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4998 | ||
18eace3b | 4999 | /* Get event node */ |
1083b49a JG |
5000 | ua_event = find_ust_app_event(ua_chan->events, |
5001 | uevent->attr.name, uevent->filter, | |
5002 | (enum lttng_ust_abi_loglevel_type) | |
5003 | uevent->attr.loglevel_type, | |
5004 | uevent->attr.loglevel, uevent->exclusion); | |
18eace3b | 5005 | if (ua_event == NULL) { |
7f79d3a1 | 5006 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 5007 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 5008 | goto next_app; |
35a9059d | 5009 | } |
35a9059d DG |
5010 | |
5011 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
5012 | if (ret < 0) { | |
d0b96690 | 5013 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 5014 | goto error; |
48842b30 | 5015 | } |
d0b96690 DG |
5016 | next_app: |
5017 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
5018 | } |
5019 | ||
7f79d3a1 | 5020 | error: |
edb67388 | 5021 | rcu_read_unlock(); |
edb67388 DG |
5022 | return ret; |
5023 | } | |
5024 | ||
5025 | /* | |
5026 | * For a specific existing UST session and UST channel, creates the event for | |
5027 | * all registered apps. | |
5028 | */ | |
35a9059d | 5029 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
5030 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
5031 | { | |
5032 | int ret = 0; | |
bec39940 DG |
5033 | struct lttng_ht_iter iter, uiter; |
5034 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
5035 | struct ust_app *app; |
5036 | struct ust_app_session *ua_sess; | |
5037 | struct ust_app_channel *ua_chan; | |
5038 | ||
88e3c2f5 | 5039 | assert(usess->active); |
d9bf3ca4 | 5040 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 5041 | uevent->attr.name, usess->id); |
edb67388 | 5042 | |
edb67388 DG |
5043 | rcu_read_lock(); |
5044 | ||
5045 | /* For all registered applications */ | |
852d0037 | 5046 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5047 | if (!app->compatible) { |
5048 | /* | |
5049 | * TODO: In time, we should notice the caller of this error by | |
5050 | * telling him that this is a version error. | |
5051 | */ | |
5052 | continue; | |
5053 | } | |
edb67388 | 5054 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
5055 | if (!ua_sess) { |
5056 | /* The application has problem or is probably dead. */ | |
5057 | continue; | |
5058 | } | |
48842b30 | 5059 | |
d0b96690 | 5060 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5061 | |
5062 | if (ua_sess->deleted) { | |
5063 | pthread_mutex_unlock(&ua_sess->lock); | |
5064 | continue; | |
5065 | } | |
5066 | ||
48842b30 | 5067 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5068 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5069 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
5070 | /* If the channel is not found, there is a code flow error */ |
5071 | assert(ua_chan_node); | |
5072 | ||
48842b30 DG |
5073 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
5074 | ||
edb67388 | 5075 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 5076 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 5077 | if (ret < 0) { |
49c336c1 | 5078 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
5079 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
5080 | break; | |
5081 | } | |
5082 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 5083 | uevent->attr.name, app->pid); |
5b4a0ec0 | 5084 | continue; |
48842b30 | 5085 | } |
48842b30 | 5086 | } |
5b4a0ec0 | 5087 | |
48842b30 | 5088 | rcu_read_unlock(); |
48842b30 DG |
5089 | return ret; |
5090 | } | |
5091 | ||
5b4a0ec0 DG |
5092 | /* |
5093 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
5094 | * |
5095 | * Called with UST app session lock held. | |
5096 | * | |
5b4a0ec0 | 5097 | */ |
b34cbebf | 5098 | static |
421cb601 | 5099 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
5100 | { |
5101 | int ret = 0; | |
48842b30 | 5102 | struct ust_app_session *ua_sess; |
48842b30 | 5103 | |
852d0037 | 5104 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 5105 | |
509cbaf8 MD |
5106 | rcu_read_lock(); |
5107 | ||
e0c7ec2b DG |
5108 | if (!app->compatible) { |
5109 | goto end; | |
5110 | } | |
5111 | ||
421cb601 DG |
5112 | ua_sess = lookup_session_by_app(usess, app); |
5113 | if (ua_sess == NULL) { | |
d42f20df DG |
5114 | /* The session is in teardown process. Ignore and continue. */ |
5115 | goto end; | |
421cb601 | 5116 | } |
48842b30 | 5117 | |
d0b96690 DG |
5118 | pthread_mutex_lock(&ua_sess->lock); |
5119 | ||
b161602a MD |
5120 | if (ua_sess->deleted) { |
5121 | pthread_mutex_unlock(&ua_sess->lock); | |
5122 | goto end; | |
5123 | } | |
5124 | ||
b0a1c741 JR |
5125 | if (ua_sess->enabled) { |
5126 | pthread_mutex_unlock(&ua_sess->lock); | |
5127 | goto end; | |
5128 | } | |
5129 | ||
aea829b3 DG |
5130 | /* Upon restart, we skip the setup, already done */ |
5131 | if (ua_sess->started) { | |
8be98f9a | 5132 | goto skip_setup; |
aea829b3 | 5133 | } |
8be98f9a | 5134 | |
840cb59c | 5135 | health_code_update(); |
86acf0da | 5136 | |
8be98f9a | 5137 | skip_setup: |
a945cdc7 | 5138 | /* This starts the UST tracing */ |
fb45065e | 5139 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5140 | ret = lttng_ust_ctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 5141 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 5142 | if (ret < 0) { |
569744c5 JR |
5143 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
5144 | DBG3("UST app start session failed. Application is dead: pid = %d, sock = %d", | |
5145 | app->pid, app->sock); | |
3757b385 DG |
5146 | pthread_mutex_unlock(&ua_sess->lock); |
5147 | goto end; | |
569744c5 JR |
5148 | } else if (ret == -EAGAIN) { |
5149 | WARN("UST app start session failed. Communication time out: pid = %d, sock = %d", | |
5150 | app->pid, app->sock); | |
5151 | pthread_mutex_unlock(&ua_sess->lock); | |
5152 | goto end; | |
5153 | ||
5154 | } else { | |
5155 | ERR("UST app start session failed with ret %d: pid = %d, sock = %d", | |
5156 | ret, app->pid, app->sock); | |
ffe60014 | 5157 | } |
d0b96690 | 5158 | goto error_unlock; |
421cb601 | 5159 | } |
5b4a0ec0 | 5160 | |
55c3953d DG |
5161 | /* Indicate that the session has been started once */ |
5162 | ua_sess->started = 1; | |
b0a1c741 | 5163 | ua_sess->enabled = 1; |
55c3953d | 5164 | |
d0b96690 DG |
5165 | pthread_mutex_unlock(&ua_sess->lock); |
5166 | ||
840cb59c | 5167 | health_code_update(); |
86acf0da | 5168 | |
421cb601 | 5169 | /* Quiescent wait after starting trace */ |
fb45065e | 5170 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5171 | ret = lttng_ust_ctl_wait_quiescent(app->sock); |
fb45065e | 5172 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
5173 | if (ret < 0) { |
5174 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
5175 | DBG3("UST app wait quiescent failed. Application is dead: pid = %d, sock = %d", | |
5176 | app->pid, app->sock); | |
5177 | } else if (ret == -EAGAIN) { | |
5178 | WARN("UST app wait quiescent failed. Communication time out: pid = %d, sock = %d", | |
5179 | app->pid, app->sock); | |
5180 | } else { | |
5181 | ERR("UST app wait quiescent failed with ret %d: pid %d, sock = %d", | |
5182 | ret, app->pid, app->sock); | |
5183 | } | |
ffe60014 | 5184 | } |
48842b30 | 5185 | |
e0c7ec2b DG |
5186 | end: |
5187 | rcu_read_unlock(); | |
840cb59c | 5188 | health_code_update(); |
421cb601 | 5189 | return 0; |
48842b30 | 5190 | |
d0b96690 DG |
5191 | error_unlock: |
5192 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 5193 | rcu_read_unlock(); |
840cb59c | 5194 | health_code_update(); |
421cb601 DG |
5195 | return -1; |
5196 | } | |
48842b30 | 5197 | |
8be98f9a MD |
5198 | /* |
5199 | * Stop tracing for a specific UST session and app. | |
5200 | */ | |
b34cbebf | 5201 | static |
8be98f9a MD |
5202 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
5203 | { | |
5204 | int ret = 0; | |
5205 | struct ust_app_session *ua_sess; | |
7972aab2 | 5206 | struct ust_registry_session *registry; |
8be98f9a | 5207 | |
852d0037 | 5208 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
5209 | |
5210 | rcu_read_lock(); | |
5211 | ||
e0c7ec2b | 5212 | if (!app->compatible) { |
d88aee68 | 5213 | goto end_no_session; |
e0c7ec2b DG |
5214 | } |
5215 | ||
8be98f9a MD |
5216 | ua_sess = lookup_session_by_app(usess, app); |
5217 | if (ua_sess == NULL) { | |
d88aee68 | 5218 | goto end_no_session; |
8be98f9a MD |
5219 | } |
5220 | ||
d88aee68 DG |
5221 | pthread_mutex_lock(&ua_sess->lock); |
5222 | ||
b161602a MD |
5223 | if (ua_sess->deleted) { |
5224 | pthread_mutex_unlock(&ua_sess->lock); | |
5225 | goto end_no_session; | |
5226 | } | |
5227 | ||
9bc07046 DG |
5228 | /* |
5229 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
5230 | * that was never started. It's possible since we can have a fail start |
5231 | * from either the application manager thread or the command thread. Simply | |
5232 | * indicate that this is a stop error. | |
9bc07046 | 5233 | */ |
f9dfc3d9 | 5234 | if (!ua_sess->started) { |
c45536e1 DG |
5235 | goto error_rcu_unlock; |
5236 | } | |
7db205b5 | 5237 | |
840cb59c | 5238 | health_code_update(); |
86acf0da | 5239 | |
9d6c7d3f | 5240 | /* This inhibits UST tracing */ |
fb45065e | 5241 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5242 | ret = lttng_ust_ctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 5243 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 5244 | if (ret < 0) { |
569744c5 JR |
5245 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
5246 | DBG3("UST app stop session failed. Application is dead: pid = %d, sock = %d", | |
5247 | app->pid, app->sock); | |
3757b385 | 5248 | goto end_unlock; |
569744c5 JR |
5249 | } else if (ret == -EAGAIN) { |
5250 | WARN("UST app stop session failed. Communication time out: pid = %d, sock = %d", | |
5251 | app->pid, app->sock); | |
5252 | goto end_unlock; | |
5253 | ||
5254 | } else { | |
5255 | ERR("UST app stop session failed with ret %d: pid = %d, sock = %d", | |
5256 | ret, app->pid, app->sock); | |
ffe60014 | 5257 | } |
9d6c7d3f DG |
5258 | goto error_rcu_unlock; |
5259 | } | |
5260 | ||
840cb59c | 5261 | health_code_update(); |
b0a1c741 | 5262 | ua_sess->enabled = 0; |
86acf0da | 5263 | |
9d6c7d3f | 5264 | /* Quiescent wait after stopping trace */ |
fb45065e | 5265 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5266 | ret = lttng_ust_ctl_wait_quiescent(app->sock); |
fb45065e | 5267 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
5268 | if (ret < 0) { |
5269 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
5270 | DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d)", | |
5271 | app->pid, app->sock); | |
5272 | } else if (ret == -EAGAIN) { | |
5273 | WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d)", | |
5274 | app->pid, app->sock); | |
5275 | } else { | |
5276 | ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d)", | |
5277 | ret, app->pid, app->sock); | |
5278 | } | |
ffe60014 | 5279 | } |
9d6c7d3f | 5280 | |
840cb59c | 5281 | health_code_update(); |
86acf0da | 5282 | |
b34cbebf | 5283 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5284 | |
5285 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 5286 | assert(registry); |
1b532a60 | 5287 | |
ce34fcd0 MD |
5288 | /* Push metadata for application before freeing the application. */ |
5289 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 5290 | |
3757b385 | 5291 | end_unlock: |
b34cbebf MD |
5292 | pthread_mutex_unlock(&ua_sess->lock); |
5293 | end_no_session: | |
5294 | rcu_read_unlock(); | |
5295 | health_code_update(); | |
5296 | return 0; | |
5297 | ||
5298 | error_rcu_unlock: | |
5299 | pthread_mutex_unlock(&ua_sess->lock); | |
5300 | rcu_read_unlock(); | |
5301 | health_code_update(); | |
5302 | return -1; | |
5303 | } | |
5304 | ||
b34cbebf | 5305 | static |
c4b88406 MD |
5306 | int ust_app_flush_app_session(struct ust_app *app, |
5307 | struct ust_app_session *ua_sess) | |
b34cbebf | 5308 | { |
c4b88406 | 5309 | int ret, retval = 0; |
b34cbebf | 5310 | struct lttng_ht_iter iter; |
b34cbebf | 5311 | struct ust_app_channel *ua_chan; |
c4b88406 | 5312 | struct consumer_socket *socket; |
b34cbebf | 5313 | |
c4b88406 | 5314 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
5315 | |
5316 | rcu_read_lock(); | |
5317 | ||
5318 | if (!app->compatible) { | |
c4b88406 | 5319 | goto end_not_compatible; |
b34cbebf MD |
5320 | } |
5321 | ||
5322 | pthread_mutex_lock(&ua_sess->lock); | |
5323 | ||
b161602a MD |
5324 | if (ua_sess->deleted) { |
5325 | goto end_deleted; | |
5326 | } | |
5327 | ||
b34cbebf MD |
5328 | health_code_update(); |
5329 | ||
9d6c7d3f | 5330 | /* Flushing buffers */ |
c4b88406 MD |
5331 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
5332 | ua_sess->consumer); | |
ce34fcd0 MD |
5333 | |
5334 | /* Flush buffers and push metadata. */ | |
5335 | switch (ua_sess->buffer_type) { | |
5336 | case LTTNG_BUFFER_PER_PID: | |
5337 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
5338 | node.node) { | |
5339 | health_code_update(); | |
ce34fcd0 MD |
5340 | ret = consumer_flush_channel(socket, ua_chan->key); |
5341 | if (ret) { | |
5342 | ERR("Error flushing consumer channel"); | |
5343 | retval = -1; | |
5344 | continue; | |
5345 | } | |
8be98f9a | 5346 | } |
ce34fcd0 MD |
5347 | break; |
5348 | case LTTNG_BUFFER_PER_UID: | |
5349 | default: | |
5350 | assert(0); | |
5351 | break; | |
8be98f9a | 5352 | } |
8be98f9a | 5353 | |
840cb59c | 5354 | health_code_update(); |
86acf0da | 5355 | |
b161602a | 5356 | end_deleted: |
d88aee68 | 5357 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 5358 | |
c4b88406 MD |
5359 | end_not_compatible: |
5360 | rcu_read_unlock(); | |
5361 | health_code_update(); | |
5362 | return retval; | |
5363 | } | |
5364 | ||
5365 | /* | |
ce34fcd0 MD |
5366 | * Flush buffers for all applications for a specific UST session. |
5367 | * Called with UST session lock held. | |
c4b88406 MD |
5368 | */ |
5369 | static | |
ce34fcd0 | 5370 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
5371 | |
5372 | { | |
99b1411c | 5373 | int ret = 0; |
c4b88406 | 5374 | |
ce34fcd0 | 5375 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
5376 | |
5377 | rcu_read_lock(); | |
5378 | ||
ce34fcd0 MD |
5379 | /* Flush buffers and push metadata. */ |
5380 | switch (usess->buffer_type) { | |
5381 | case LTTNG_BUFFER_PER_UID: | |
5382 | { | |
5383 | struct buffer_reg_uid *reg; | |
5384 | struct lttng_ht_iter iter; | |
5385 | ||
5386 | /* Flush all per UID buffers associated to that session. */ | |
5387 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5388 | struct ust_registry_session *ust_session_reg; | |
3273699d | 5389 | struct buffer_reg_channel *buf_reg_chan; |
ce34fcd0 MD |
5390 | struct consumer_socket *socket; |
5391 | ||
5392 | /* Get consumer socket to use to push the metadata.*/ | |
5393 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5394 | usess->consumer); | |
5395 | if (!socket) { | |
5396 | /* Ignore request if no consumer is found for the session. */ | |
5397 | continue; | |
5398 | } | |
5399 | ||
5400 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3273699d | 5401 | buf_reg_chan, node.node) { |
ce34fcd0 MD |
5402 | /* |
5403 | * The following call will print error values so the return | |
5404 | * code is of little importance because whatever happens, we | |
5405 | * have to try them all. | |
5406 | */ | |
3273699d | 5407 | (void) consumer_flush_channel(socket, buf_reg_chan->consumer_key); |
ce34fcd0 MD |
5408 | } |
5409 | ||
5410 | ust_session_reg = reg->registry->reg.ust; | |
5411 | /* Push metadata. */ | |
5412 | (void) push_metadata(ust_session_reg, usess->consumer); | |
5413 | } | |
ce34fcd0 MD |
5414 | break; |
5415 | } | |
5416 | case LTTNG_BUFFER_PER_PID: | |
5417 | { | |
5418 | struct ust_app_session *ua_sess; | |
5419 | struct lttng_ht_iter iter; | |
5420 | struct ust_app *app; | |
5421 | ||
5422 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5423 | ua_sess = lookup_session_by_app(usess, app); | |
5424 | if (ua_sess == NULL) { | |
5425 | continue; | |
5426 | } | |
5427 | (void) ust_app_flush_app_session(app, ua_sess); | |
5428 | } | |
5429 | break; | |
5430 | } | |
5431 | default: | |
99b1411c | 5432 | ret = -1; |
ce34fcd0 MD |
5433 | assert(0); |
5434 | break; | |
c4b88406 | 5435 | } |
c4b88406 | 5436 | |
7db205b5 | 5437 | rcu_read_unlock(); |
840cb59c | 5438 | health_code_update(); |
c4b88406 | 5439 | return ret; |
8be98f9a MD |
5440 | } |
5441 | ||
0dd01979 MD |
5442 | static |
5443 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
5444 | struct ust_app_session *ua_sess) | |
5445 | { | |
5446 | int ret = 0; | |
5447 | struct lttng_ht_iter iter; | |
5448 | struct ust_app_channel *ua_chan; | |
5449 | struct consumer_socket *socket; | |
5450 | ||
5451 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
5452 | ||
5453 | rcu_read_lock(); | |
5454 | ||
5455 | if (!app->compatible) { | |
5456 | goto end_not_compatible; | |
5457 | } | |
5458 | ||
5459 | pthread_mutex_lock(&ua_sess->lock); | |
5460 | ||
5461 | if (ua_sess->deleted) { | |
5462 | goto end_unlock; | |
5463 | } | |
5464 | ||
5465 | health_code_update(); | |
5466 | ||
5467 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5468 | ua_sess->consumer); | |
5469 | if (!socket) { | |
5470 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5471 | app->bits_per_long); | |
5472 | ret = -1; | |
5473 | goto end_unlock; | |
5474 | } | |
5475 | ||
5476 | /* Clear quiescent state. */ | |
5477 | switch (ua_sess->buffer_type) { | |
5478 | case LTTNG_BUFFER_PER_PID: | |
5479 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5480 | ua_chan, node.node) { | |
5481 | health_code_update(); | |
5482 | ret = consumer_clear_quiescent_channel(socket, | |
5483 | ua_chan->key); | |
5484 | if (ret) { | |
5485 | ERR("Error clearing quiescent state for consumer channel"); | |
5486 | ret = -1; | |
5487 | continue; | |
5488 | } | |
5489 | } | |
5490 | break; | |
5491 | case LTTNG_BUFFER_PER_UID: | |
5492 | default: | |
5493 | assert(0); | |
5494 | ret = -1; | |
5495 | break; | |
5496 | } | |
5497 | ||
5498 | health_code_update(); | |
5499 | ||
5500 | end_unlock: | |
5501 | pthread_mutex_unlock(&ua_sess->lock); | |
5502 | ||
5503 | end_not_compatible: | |
5504 | rcu_read_unlock(); | |
5505 | health_code_update(); | |
5506 | return ret; | |
5507 | } | |
5508 | ||
5509 | /* | |
5510 | * Clear quiescent state in each stream for all applications for a | |
5511 | * specific UST session. | |
5512 | * Called with UST session lock held. | |
5513 | */ | |
5514 | static | |
5515 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5516 | ||
5517 | { | |
5518 | int ret = 0; | |
5519 | ||
5520 | DBG("Clearing stream quiescent state for all ust apps"); | |
5521 | ||
5522 | rcu_read_lock(); | |
5523 | ||
5524 | switch (usess->buffer_type) { | |
5525 | case LTTNG_BUFFER_PER_UID: | |
5526 | { | |
5527 | struct lttng_ht_iter iter; | |
5528 | struct buffer_reg_uid *reg; | |
5529 | ||
5530 | /* | |
5531 | * Clear quiescent for all per UID buffers associated to | |
5532 | * that session. | |
5533 | */ | |
5534 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5535 | struct consumer_socket *socket; | |
3273699d | 5536 | struct buffer_reg_channel *buf_reg_chan; |
0dd01979 MD |
5537 | |
5538 | /* Get associated consumer socket.*/ | |
5539 | socket = consumer_find_socket_by_bitness( | |
5540 | reg->bits_per_long, usess->consumer); | |
5541 | if (!socket) { | |
5542 | /* | |
5543 | * Ignore request if no consumer is found for | |
5544 | * the session. | |
5545 | */ | |
5546 | continue; | |
5547 | } | |
5548 | ||
5549 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
3273699d | 5550 | &iter.iter, buf_reg_chan, node.node) { |
0dd01979 MD |
5551 | /* |
5552 | * The following call will print error values so | |
5553 | * the return code is of little importance | |
5554 | * because whatever happens, we have to try them | |
5555 | * all. | |
5556 | */ | |
5557 | (void) consumer_clear_quiescent_channel(socket, | |
3273699d | 5558 | buf_reg_chan->consumer_key); |
0dd01979 MD |
5559 | } |
5560 | } | |
5561 | break; | |
5562 | } | |
5563 | case LTTNG_BUFFER_PER_PID: | |
5564 | { | |
5565 | struct ust_app_session *ua_sess; | |
5566 | struct lttng_ht_iter iter; | |
5567 | struct ust_app *app; | |
5568 | ||
5569 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5570 | pid_n.node) { | |
5571 | ua_sess = lookup_session_by_app(usess, app); | |
5572 | if (ua_sess == NULL) { | |
5573 | continue; | |
5574 | } | |
5575 | (void) ust_app_clear_quiescent_app_session(app, | |
5576 | ua_sess); | |
5577 | } | |
5578 | break; | |
5579 | } | |
5580 | default: | |
5581 | ret = -1; | |
5582 | assert(0); | |
5583 | break; | |
5584 | } | |
5585 | ||
5586 | rcu_read_unlock(); | |
5587 | health_code_update(); | |
5588 | return ret; | |
5589 | } | |
5590 | ||
84cd17c6 MD |
5591 | /* |
5592 | * Destroy a specific UST session in apps. | |
5593 | */ | |
3353de95 | 5594 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5595 | { |
ffe60014 | 5596 | int ret; |
84cd17c6 | 5597 | struct ust_app_session *ua_sess; |
bec39940 | 5598 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5599 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5600 | |
852d0037 | 5601 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5602 | |
5603 | rcu_read_lock(); | |
5604 | ||
e0c7ec2b DG |
5605 | if (!app->compatible) { |
5606 | goto end; | |
5607 | } | |
5608 | ||
84cd17c6 | 5609 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5610 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5611 | if (node == NULL) { |
d42f20df DG |
5612 | /* Session is being or is deleted. */ |
5613 | goto end; | |
84cd17c6 MD |
5614 | } |
5615 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5616 | |
840cb59c | 5617 | health_code_update(); |
d0b96690 | 5618 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5619 | |
840cb59c | 5620 | health_code_update(); |
7db205b5 | 5621 | |
84cd17c6 | 5622 | /* Quiescent wait after stopping trace */ |
fb45065e | 5623 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 5624 | ret = lttng_ust_ctl_wait_quiescent(app->sock); |
fb45065e | 5625 | pthread_mutex_unlock(&app->sock_lock); |
569744c5 JR |
5626 | if (ret < 0) { |
5627 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { | |
5628 | DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d)", | |
5629 | app->pid, app->sock); | |
5630 | } else if (ret == -EAGAIN) { | |
5631 | WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d)", | |
5632 | app->pid, app->sock); | |
5633 | } else { | |
5634 | ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d)", | |
5635 | ret, app->pid, app->sock); | |
5636 | } | |
ffe60014 | 5637 | } |
e0c7ec2b DG |
5638 | end: |
5639 | rcu_read_unlock(); | |
840cb59c | 5640 | health_code_update(); |
84cd17c6 | 5641 | return 0; |
84cd17c6 MD |
5642 | } |
5643 | ||
5b4a0ec0 DG |
5644 | /* |
5645 | * Start tracing for the UST session. | |
5646 | */ | |
421cb601 DG |
5647 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5648 | { | |
bec39940 | 5649 | struct lttng_ht_iter iter; |
421cb601 | 5650 | struct ust_app *app; |
48842b30 | 5651 | |
421cb601 DG |
5652 | DBG("Starting all UST traces"); |
5653 | ||
bb2452c8 MD |
5654 | /* |
5655 | * Even though the start trace might fail, flag this session active so | |
5656 | * other application coming in are started by default. | |
5657 | */ | |
5658 | usess->active = 1; | |
5659 | ||
421cb601 | 5660 | rcu_read_lock(); |
421cb601 | 5661 | |
0dd01979 MD |
5662 | /* |
5663 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5664 | * of each channel set by the prior stop command, thus ensuring that a | |
5665 | * following stop or destroy is sure to grab a timestamp_end near those | |
5666 | * operations, even if the packet is empty. | |
5667 | */ | |
5668 | (void) ust_app_clear_quiescent_session(usess); | |
5669 | ||
0498a00c MD |
5670 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5671 | ust_app_global_update(usess, app); | |
5672 | } | |
5673 | ||
48842b30 DG |
5674 | rcu_read_unlock(); |
5675 | ||
5676 | return 0; | |
5677 | } | |
487cf67c | 5678 | |
8be98f9a MD |
5679 | /* |
5680 | * Start tracing for the UST session. | |
ce34fcd0 | 5681 | * Called with UST session lock held. |
8be98f9a MD |
5682 | */ |
5683 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5684 | { | |
5685 | int ret = 0; | |
bec39940 | 5686 | struct lttng_ht_iter iter; |
8be98f9a MD |
5687 | struct ust_app *app; |
5688 | ||
5689 | DBG("Stopping all UST traces"); | |
5690 | ||
bb2452c8 MD |
5691 | /* |
5692 | * Even though the stop trace might fail, flag this session inactive so | |
5693 | * other application coming in are not started by default. | |
5694 | */ | |
5695 | usess->active = 0; | |
5696 | ||
8be98f9a MD |
5697 | rcu_read_lock(); |
5698 | ||
b34cbebf MD |
5699 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5700 | ret = ust_app_stop_trace(usess, app); | |
5701 | if (ret < 0) { | |
5702 | /* Continue to next apps even on error */ | |
5703 | continue; | |
5704 | } | |
5705 | } | |
5706 | ||
ce34fcd0 | 5707 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5708 | |
5709 | rcu_read_unlock(); | |
5710 | ||
5711 | return 0; | |
5712 | } | |
5713 | ||
84cd17c6 MD |
5714 | /* |
5715 | * Destroy app UST session. | |
5716 | */ | |
5717 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5718 | { | |
5719 | int ret = 0; | |
bec39940 | 5720 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5721 | struct ust_app *app; |
5722 | ||
5723 | DBG("Destroy all UST traces"); | |
5724 | ||
5725 | rcu_read_lock(); | |
5726 | ||
852d0037 | 5727 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5728 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5729 | if (ret < 0) { |
5730 | /* Continue to next apps even on error */ | |
5731 | continue; | |
5732 | } | |
5733 | } | |
5734 | ||
5735 | rcu_read_unlock(); | |
5736 | ||
5737 | return 0; | |
5738 | } | |
5739 | ||
88e3c2f5 | 5740 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5741 | static |
88e3c2f5 JG |
5742 | int find_or_create_ust_app_channel( |
5743 | struct ltt_ust_session *usess, | |
5744 | struct ust_app_session *ua_sess, | |
5745 | struct ust_app *app, | |
5746 | struct ltt_ust_channel *uchan, | |
5747 | struct ust_app_channel **ua_chan) | |
487cf67c | 5748 | { |
55c54cce | 5749 | int ret = 0; |
88e3c2f5 JG |
5750 | struct lttng_ht_iter iter; |
5751 | struct lttng_ht_node_str *ua_chan_node; | |
5752 | ||
5753 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5754 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5755 | if (ua_chan_node) { | |
5756 | *ua_chan = caa_container_of(ua_chan_node, | |
5757 | struct ust_app_channel, node); | |
5758 | goto end; | |
5759 | } | |
5760 | ||
5761 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5762 | if (ret) { | |
5763 | goto end; | |
5764 | } | |
5765 | end: | |
5766 | return ret; | |
5767 | } | |
5768 | ||
5769 | static | |
5770 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5771 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5772 | struct ust_app *app) | |
5773 | { | |
5774 | int ret = 0; | |
5775 | struct ust_app_event *ua_event = NULL; | |
5776 | ||
5777 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
1083b49a JG |
5778 | uevent->filter, |
5779 | (enum lttng_ust_abi_loglevel_type) | |
5780 | uevent->attr.loglevel_type, | |
5781 | uevent->attr.loglevel, uevent->exclusion); | |
88e3c2f5 JG |
5782 | if (!ua_event) { |
5783 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5784 | if (ret < 0) { | |
5785 | goto end; | |
5786 | } | |
5787 | } else { | |
5788 | if (ua_event->enabled != uevent->enabled) { | |
5789 | ret = uevent->enabled ? | |
5790 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5791 | disable_ust_app_event(ua_sess, ua_event, app); | |
5792 | } | |
5793 | } | |
5794 | ||
5795 | end: | |
5796 | return ret; | |
5797 | } | |
5798 | ||
993578ff JR |
5799 | /* Called with RCU read-side lock held. */ |
5800 | static | |
5801 | void ust_app_synchronize_event_notifier_rules(struct ust_app *app) | |
5802 | { | |
5803 | int ret = 0; | |
5804 | enum lttng_error_code ret_code; | |
5805 | enum lttng_trigger_status t_status; | |
5806 | struct lttng_ht_iter app_trigger_iter; | |
5807 | struct lttng_triggers *triggers = NULL; | |
5808 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5809 | unsigned int count, i; | |
5810 | ||
27a3be48 MD |
5811 | if (!ust_app_supports_notifiers(app)) { |
5812 | goto end; | |
5813 | } | |
5814 | ||
993578ff JR |
5815 | /* |
5816 | * Currrently, registering or unregistering a trigger with an | |
5817 | * event rule condition causes a full synchronization of the event | |
5818 | * notifiers. | |
5819 | * | |
5820 | * The first step attempts to add an event notifier for all registered | |
5821 | * triggers that apply to the user space tracers. Then, the | |
5822 | * application's event notifiers rules are all checked against the list | |
5823 | * of registered triggers. Any event notifier that doesn't have a | |
5824 | * matching trigger can be assumed to have been disabled. | |
5825 | * | |
5826 | * All of this is inefficient, but is put in place to get the feature | |
5827 | * rolling as it is simpler at this moment. It will be optimized Soon™ | |
5828 | * to allow the state of enabled | |
5829 | * event notifiers to be synchronized in a piece-wise way. | |
5830 | */ | |
5831 | ||
5832 | /* Get all triggers using uid 0 (root) */ | |
5833 | ret_code = notification_thread_command_list_triggers( | |
412d7227 | 5834 | the_notification_thread_handle, 0, &triggers); |
993578ff | 5835 | if (ret_code != LTTNG_OK) { |
993578ff JR |
5836 | goto end; |
5837 | } | |
5838 | ||
5839 | assert(triggers); | |
5840 | ||
5841 | t_status = lttng_triggers_get_count(triggers, &count); | |
5842 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
993578ff JR |
5843 | goto end; |
5844 | } | |
5845 | ||
5846 | for (i = 0; i < count; i++) { | |
5847 | struct lttng_condition *condition; | |
5848 | struct lttng_event_rule *event_rule; | |
5849 | struct lttng_trigger *trigger; | |
5850 | const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule; | |
5851 | enum lttng_condition_status condition_status; | |
5852 | uint64_t token; | |
5853 | ||
5854 | trigger = lttng_triggers_borrow_mutable_at_index(triggers, i); | |
5855 | assert(trigger); | |
5856 | ||
5857 | token = lttng_trigger_get_tracer_token(trigger); | |
5858 | condition = lttng_trigger_get_condition(trigger); | |
5859 | ||
8dbb86b8 JR |
5860 | if (lttng_condition_get_type(condition) != |
5861 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES) { | |
993578ff JR |
5862 | /* Does not apply */ |
5863 | continue; | |
5864 | } | |
5865 | ||
8dbb86b8 JR |
5866 | condition_status = |
5867 | lttng_condition_event_rule_matches_borrow_rule_mutable( | |
5868 | condition, &event_rule); | |
993578ff JR |
5869 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); |
5870 | ||
5871 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5872 | /* Skip kernel related triggers. */ | |
5873 | continue; | |
5874 | } | |
5875 | ||
5876 | /* | |
5877 | * Find or create the associated token event rule. The caller | |
5878 | * holds the RCU read lock, so this is safe to call without | |
5879 | * explicitly acquiring it here. | |
5880 | */ | |
5881 | looked_up_event_notifier_rule = find_ust_app_event_notifier_rule( | |
5882 | app->token_to_event_notifier_rule_ht, token); | |
5883 | if (!looked_up_event_notifier_rule) { | |
267d66aa | 5884 | ret = create_ust_app_event_notifier_rule(trigger, app); |
993578ff JR |
5885 | if (ret < 0) { |
5886 | goto end; | |
5887 | } | |
5888 | } | |
5889 | } | |
5890 | ||
5891 | rcu_read_lock(); | |
5892 | /* Remove all unknown event sources from the app. */ | |
5893 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
5894 | &app_trigger_iter.iter, event_notifier_rule, | |
5895 | node.node) { | |
5896 | const uint64_t app_token = event_notifier_rule->token; | |
5897 | bool found = false; | |
5898 | ||
5899 | /* | |
5900 | * Check if the app event trigger still exists on the | |
5901 | * notification side. | |
5902 | */ | |
5903 | for (i = 0; i < count; i++) { | |
5904 | uint64_t notification_thread_token; | |
5905 | const struct lttng_trigger *trigger = | |
5906 | lttng_triggers_get_at_index( | |
5907 | triggers, i); | |
5908 | ||
5909 | assert(trigger); | |
5910 | ||
5911 | notification_thread_token = | |
5912 | lttng_trigger_get_tracer_token(trigger); | |
5913 | ||
5914 | if (notification_thread_token == app_token) { | |
5915 | found = true; | |
5916 | break; | |
5917 | } | |
5918 | } | |
5919 | ||
5920 | if (found) { | |
5921 | /* Still valid. */ | |
5922 | continue; | |
5923 | } | |
5924 | ||
5925 | /* | |
5926 | * This trigger was unregistered, disable it on the tracer's | |
5927 | * side. | |
5928 | */ | |
5929 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, | |
5930 | &app_trigger_iter); | |
5931 | assert(ret == 0); | |
5932 | ||
5933 | /* Callee logs errors. */ | |
5934 | (void) disable_ust_object(app, event_notifier_rule->obj); | |
5935 | ||
5936 | delete_ust_app_event_notifier_rule( | |
5937 | app->sock, event_notifier_rule, app); | |
5938 | } | |
5939 | ||
5940 | rcu_read_unlock(); | |
5941 | ||
5942 | end: | |
5943 | lttng_triggers_destroy(triggers); | |
5944 | return; | |
5945 | } | |
5946 | ||
88e3c2f5 | 5947 | /* |
a84d1024 | 5948 | * RCU read lock must be held by the caller. |
88e3c2f5 JG |
5949 | */ |
5950 | static | |
a84d1024 FD |
5951 | void ust_app_synchronize_all_channels(struct ltt_ust_session *usess, |
5952 | struct ust_app_session *ua_sess, | |
88e3c2f5 JG |
5953 | struct ust_app *app) |
5954 | { | |
5955 | int ret = 0; | |
5956 | struct cds_lfht_iter uchan_iter; | |
5957 | struct ltt_ust_channel *uchan; | |
1f3580c7 | 5958 | |
a84d1024 | 5959 | assert(usess); |
3d8ca23b | 5960 | assert(ua_sess); |
a84d1024 | 5961 | assert(app); |
ef67c072 | 5962 | |
88e3c2f5 JG |
5963 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, |
5964 | uchan, node.node) { | |
5965 | struct ust_app_channel *ua_chan; | |
5966 | struct cds_lfht_iter uevent_iter; | |
5967 | struct ltt_ust_event *uevent; | |
487cf67c | 5968 | |
31746f93 | 5969 | /* |
88e3c2f5 JG |
5970 | * Search for a matching ust_app_channel. If none is found, |
5971 | * create it. Creating the channel will cause the ua_chan | |
5972 | * structure to be allocated, the channel buffers to be | |
5973 | * allocated (if necessary) and sent to the application, and | |
5974 | * all enabled contexts will be added to the channel. | |
31746f93 | 5975 | */ |
f3db82be | 5976 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
88e3c2f5 JG |
5977 | app, uchan, &ua_chan); |
5978 | if (ret) { | |
5979 | /* Tracer is probably gone or ENOMEM. */ | |
a84d1024 | 5980 | goto end; |
727d5404 DG |
5981 | } |
5982 | ||
88e3c2f5 JG |
5983 | if (!ua_chan) { |
5984 | /* ua_chan will be NULL for the metadata channel */ | |
5985 | continue; | |
5986 | } | |
727d5404 | 5987 | |
88e3c2f5 | 5988 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5989 | node.node) { |
88e3c2f5 JG |
5990 | ret = ust_app_channel_synchronize_event(ua_chan, |
5991 | uevent, ua_sess, app); | |
5992 | if (ret) { | |
a84d1024 | 5993 | goto end; |
487cf67c | 5994 | } |
36dc12cc | 5995 | } |
d0b96690 | 5996 | |
88e3c2f5 JG |
5997 | if (ua_chan->enabled != uchan->enabled) { |
5998 | ret = uchan->enabled ? | |
5999 | enable_ust_app_channel(ua_sess, uchan, app) : | |
6000 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
6001 | if (ret) { | |
a84d1024 | 6002 | goto end; |
88e3c2f5 JG |
6003 | } |
6004 | } | |
36dc12cc | 6005 | } |
a84d1024 FD |
6006 | end: |
6007 | return; | |
6008 | } | |
6009 | ||
6010 | /* | |
6011 | * The caller must ensure that the application is compatible and is tracked | |
6012 | * by the process attribute trackers. | |
6013 | */ | |
6014 | static | |
6015 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
6016 | struct ust_app *app) | |
6017 | { | |
6018 | int ret = 0; | |
6019 | struct ust_app_session *ua_sess = NULL; | |
6020 | ||
6021 | /* | |
6022 | * The application's configuration should only be synchronized for | |
6023 | * active sessions. | |
6024 | */ | |
6025 | assert(usess->active); | |
6026 | ||
6027 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
6028 | if (ret < 0) { | |
6029 | /* Tracer is probably gone or ENOMEM. */ | |
1549157c FD |
6030 | if (ua_sess) { |
6031 | destroy_app_session(app, ua_sess); | |
6032 | } | |
6033 | goto end; | |
a84d1024 FD |
6034 | } |
6035 | assert(ua_sess); | |
6036 | ||
6037 | pthread_mutex_lock(&ua_sess->lock); | |
6038 | if (ua_sess->deleted) { | |
1549157c | 6039 | goto deleted_session; |
a84d1024 FD |
6040 | } |
6041 | ||
6042 | rcu_read_lock(); | |
6043 | ||
6044 | ust_app_synchronize_all_channels(usess, ua_sess, app); | |
ef67c072 JG |
6045 | |
6046 | /* | |
6047 | * Create the metadata for the application. This returns gracefully if a | |
6048 | * metadata was already set for the session. | |
6049 | * | |
6050 | * The metadata channel must be created after the data channels as the | |
6051 | * consumer daemon assumes this ordering. When interacting with a relay | |
6052 | * daemon, the consumer will use this assumption to send the | |
6053 | * "STREAMS_SENT" message to the relay daemon. | |
6054 | */ | |
6055 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
6056 | if (ret < 0) { | |
1549157c FD |
6057 | ERR("Metadata creation failed for app sock %d for session id %" PRIu64, |
6058 | app->sock, usess->id); | |
ef67c072 JG |
6059 | } |
6060 | ||
88e3c2f5 | 6061 | rcu_read_unlock(); |
0498a00c | 6062 | |
1549157c | 6063 | deleted_session: |
d0b96690 | 6064 | pthread_mutex_unlock(&ua_sess->lock); |
1549157c | 6065 | end: |
487cf67c DG |
6066 | return; |
6067 | } | |
55cc08a6 | 6068 | |
a9ad0c8f MD |
6069 | static |
6070 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
6071 | { | |
6072 | struct ust_app_session *ua_sess; | |
6073 | ||
6074 | ua_sess = lookup_session_by_app(usess, app); | |
6075 | if (ua_sess == NULL) { | |
6076 | return; | |
6077 | } | |
6078 | destroy_app_session(app, ua_sess); | |
6079 | } | |
6080 | ||
6081 | /* | |
6082 | * Add channels/events from UST global domain to registered apps at sock. | |
6083 | * | |
6084 | * Called with session lock held. | |
6085 | * Called with RCU read-side lock held. | |
6086 | */ | |
6087 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
6088 | { | |
6089 | assert(usess); | |
88e3c2f5 | 6090 | assert(usess->active); |
a9ad0c8f MD |
6091 | |
6092 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
6093 | app->sock, usess->id); | |
6094 | ||
6095 | if (!app->compatible) { | |
6096 | return; | |
6097 | } | |
159b042f JG |
6098 | if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, |
6099 | usess, app->pid) && | |
55c9e7ca | 6100 | trace_ust_id_tracker_lookup( |
159b042f JG |
6101 | LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, |
6102 | usess, app->uid) && | |
55c9e7ca | 6103 | trace_ust_id_tracker_lookup( |
159b042f JG |
6104 | LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, |
6105 | usess, app->gid)) { | |
88e3c2f5 JG |
6106 | /* |
6107 | * Synchronize the application's internal tracing configuration | |
6108 | * and start tracing. | |
6109 | */ | |
6110 | ust_app_synchronize(usess, app); | |
6111 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
6112 | } else { |
6113 | ust_app_global_destroy(usess, app); | |
6114 | } | |
6115 | } | |
6116 | ||
993578ff JR |
6117 | /* |
6118 | * Add all event notifiers to an application. | |
6119 | * | |
6120 | * Called with session lock held. | |
6121 | * Called with RCU read-side lock held. | |
6122 | */ | |
6123 | void ust_app_global_update_event_notifier_rules(struct ust_app *app) | |
6124 | { | |
569744c5 JR |
6125 | DBG2("UST application global event notifier rules update: app = '%s', pid = %d)", |
6126 | app->name, app->pid); | |
993578ff | 6127 | |
27a3be48 | 6128 | if (!app->compatible || !ust_app_supports_notifiers(app)) { |
993578ff JR |
6129 | return; |
6130 | } | |
6131 | ||
6132 | if (app->event_notifier_group.object == NULL) { | |
569744c5 JR |
6133 | WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s' pid = %d)", |
6134 | app->name, app->pid); | |
993578ff JR |
6135 | return; |
6136 | } | |
6137 | ||
6138 | ust_app_synchronize_event_notifier_rules(app); | |
6139 | } | |
6140 | ||
a9ad0c8f MD |
6141 | /* |
6142 | * Called with session lock held. | |
6143 | */ | |
6144 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
6145 | { | |
6146 | struct lttng_ht_iter iter; | |
6147 | struct ust_app *app; | |
6148 | ||
6149 | rcu_read_lock(); | |
6150 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6151 | ust_app_global_update(usess, app); | |
6152 | } | |
6153 | rcu_read_unlock(); | |
6154 | } | |
6155 | ||
993578ff JR |
6156 | void ust_app_global_update_all_event_notifier_rules(void) |
6157 | { | |
6158 | struct lttng_ht_iter iter; | |
6159 | struct ust_app *app; | |
6160 | ||
6161 | rcu_read_lock(); | |
6162 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6163 | ust_app_global_update_event_notifier_rules(app); | |
6164 | } | |
6165 | ||
6166 | rcu_read_unlock(); | |
6167 | } | |
6168 | ||
55cc08a6 DG |
6169 | /* |
6170 | * Add context to a specific channel for global UST domain. | |
6171 | */ | |
6172 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
6173 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
6174 | { | |
6175 | int ret = 0; | |
bec39940 DG |
6176 | struct lttng_ht_node_str *ua_chan_node; |
6177 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
6178 | struct ust_app_channel *ua_chan = NULL; |
6179 | struct ust_app_session *ua_sess; | |
6180 | struct ust_app *app; | |
6181 | ||
88e3c2f5 | 6182 | assert(usess->active); |
0498a00c | 6183 | |
55cc08a6 | 6184 | rcu_read_lock(); |
852d0037 | 6185 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
6186 | if (!app->compatible) { |
6187 | /* | |
6188 | * TODO: In time, we should notice the caller of this error by | |
6189 | * telling him that this is a version error. | |
6190 | */ | |
6191 | continue; | |
6192 | } | |
55cc08a6 DG |
6193 | ua_sess = lookup_session_by_app(usess, app); |
6194 | if (ua_sess == NULL) { | |
6195 | continue; | |
6196 | } | |
6197 | ||
d0b96690 | 6198 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
6199 | |
6200 | if (ua_sess->deleted) { | |
6201 | pthread_mutex_unlock(&ua_sess->lock); | |
6202 | continue; | |
6203 | } | |
6204 | ||
55cc08a6 | 6205 | /* Lookup channel in the ust app session */ |
bec39940 DG |
6206 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
6207 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 6208 | if (ua_chan_node == NULL) { |
d0b96690 | 6209 | goto next_app; |
55cc08a6 DG |
6210 | } |
6211 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
6212 | node); | |
c9edf082 | 6213 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 6214 | if (ret < 0) { |
d0b96690 | 6215 | goto next_app; |
55cc08a6 | 6216 | } |
d0b96690 DG |
6217 | next_app: |
6218 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
6219 | } |
6220 | ||
55cc08a6 | 6221 | rcu_read_unlock(); |
76d45b40 DG |
6222 | return ret; |
6223 | } | |
7f79d3a1 | 6224 | |
d0b96690 DG |
6225 | /* |
6226 | * Receive registration and populate the given msg structure. | |
6227 | * | |
6228 | * On success return 0 else a negative value returned by the ustctl call. | |
6229 | */ | |
6230 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
6231 | { | |
6232 | int ret; | |
6233 | uint32_t pid, ppid, uid, gid; | |
6234 | ||
6235 | assert(msg); | |
6236 | ||
b623cb6a | 6237 | ret = lttng_ust_ctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, |
d0b96690 DG |
6238 | &pid, &ppid, &uid, &gid, |
6239 | &msg->bits_per_long, | |
6240 | &msg->uint8_t_alignment, | |
6241 | &msg->uint16_t_alignment, | |
6242 | &msg->uint32_t_alignment, | |
6243 | &msg->uint64_t_alignment, | |
6244 | &msg->long_alignment, | |
6245 | &msg->byte_order, | |
6246 | msg->name); | |
6247 | if (ret < 0) { | |
6248 | switch (-ret) { | |
6249 | case EPIPE: | |
6250 | case ECONNRESET: | |
6251 | case LTTNG_UST_ERR_EXITING: | |
6252 | DBG3("UST app recv reg message failed. Application died"); | |
6253 | break; | |
6254 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
6255 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
6256 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
6257 | LTTNG_UST_ABI_MINOR_VERSION); | |
6258 | break; | |
6259 | default: | |
6260 | ERR("UST app recv reg message failed with ret %d", ret); | |
6261 | break; | |
6262 | } | |
6263 | goto error; | |
6264 | } | |
6265 | msg->pid = (pid_t) pid; | |
6266 | msg->ppid = (pid_t) ppid; | |
6267 | msg->uid = (uid_t) uid; | |
6268 | msg->gid = (gid_t) gid; | |
6269 | ||
6270 | error: | |
6271 | return ret; | |
6272 | } | |
6273 | ||
10b56aef MD |
6274 | /* |
6275 | * Return a ust app session object using the application object and the | |
6276 | * session object descriptor has a key. If not found, NULL is returned. | |
6277 | * A RCU read side lock MUST be acquired when calling this function. | |
6278 | */ | |
6279 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
6280 | int objd) | |
6281 | { | |
6282 | struct lttng_ht_node_ulong *node; | |
6283 | struct lttng_ht_iter iter; | |
6284 | struct ust_app_session *ua_sess = NULL; | |
6285 | ||
6286 | assert(app); | |
6287 | ||
6288 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
6289 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6290 | if (node == NULL) { | |
6291 | DBG2("UST app session find by objd %d not found", objd); | |
6292 | goto error; | |
6293 | } | |
6294 | ||
6295 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
6296 | ||
6297 | error: | |
6298 | return ua_sess; | |
6299 | } | |
6300 | ||
d88aee68 DG |
6301 | /* |
6302 | * Return a ust app channel object using the application object and the channel | |
6303 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
6304 | * lock MUST be acquired before calling this function. | |
6305 | */ | |
d0b96690 DG |
6306 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
6307 | int objd) | |
6308 | { | |
6309 | struct lttng_ht_node_ulong *node; | |
6310 | struct lttng_ht_iter iter; | |
6311 | struct ust_app_channel *ua_chan = NULL; | |
6312 | ||
6313 | assert(app); | |
6314 | ||
6315 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
6316 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6317 | if (node == NULL) { | |
6318 | DBG2("UST app channel find by objd %d not found", objd); | |
6319 | goto error; | |
6320 | } | |
6321 | ||
6322 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
6323 | ||
6324 | error: | |
6325 | return ua_chan; | |
6326 | } | |
6327 | ||
fefafa36 MD |
6328 | /* |
6329 | * Fixup legacy context fields for comparison: | |
6330 | * - legacy array becomes array_nestable, | |
6331 | * - legacy struct becomes struct_nestable, | |
6332 | * - legacy variant becomes variant_nestable, | |
6333 | * legacy sequences are not emitted in LTTng-UST contexts. | |
6334 | */ | |
6335 | static int ust_app_fixup_legacy_context_fields(size_t *_nr_fields, | |
6336 | struct lttng_ust_ctl_field **_fields) | |
6337 | { | |
6338 | struct lttng_ust_ctl_field *fields = *_fields, *new_fields = NULL; | |
6339 | size_t nr_fields = *_nr_fields, new_nr_fields = 0, i, j; | |
6340 | bool found = false; | |
6341 | int ret = 0; | |
6342 | ||
6343 | for (i = 0; i < nr_fields; i++) { | |
6344 | const struct lttng_ust_ctl_field *field = &fields[i]; | |
6345 | ||
6346 | switch (field->type.atype) { | |
6347 | case lttng_ust_ctl_atype_sequence: | |
6348 | ERR("Unexpected legacy sequence context."); | |
6349 | ret = -EINVAL; | |
6350 | goto end; | |
6351 | case lttng_ust_ctl_atype_array: | |
6352 | switch (field->type.u.legacy.array.elem_type.atype) { | |
6353 | case lttng_ust_ctl_atype_integer: | |
6354 | break; | |
6355 | default: | |
6356 | ERR("Unexpected legacy array element type in context."); | |
6357 | ret = -EINVAL; | |
6358 | goto end; | |
6359 | } | |
6360 | found = true; | |
6361 | /* One field for array_nested, one field for elem type. */ | |
6362 | new_nr_fields += 2; | |
6363 | break; | |
6364 | ||
6365 | case lttng_ust_ctl_atype_struct: /* Fallthrough */ | |
6366 | case lttng_ust_ctl_atype_variant: | |
6367 | found = true; | |
6368 | new_nr_fields++; | |
6369 | break; | |
6370 | default: | |
6371 | new_nr_fields++; | |
6372 | break; | |
6373 | } | |
6374 | } | |
6375 | if (!found) { | |
6376 | goto end; | |
6377 | } | |
6378 | new_fields = (struct lttng_ust_ctl_field *) zmalloc(sizeof(*new_fields) * new_nr_fields); | |
6379 | if (!new_fields) { | |
6380 | ret = -ENOMEM; | |
6381 | goto end; | |
6382 | } | |
6383 | for (i = 0, j = 0; i < nr_fields; i++, j++) { | |
6384 | const struct lttng_ust_ctl_field *field = &fields[i]; | |
6385 | struct lttng_ust_ctl_field *new_field = &new_fields[j]; | |
6386 | ||
6387 | switch (field->type.atype) { | |
6388 | case lttng_ust_ctl_atype_array: | |
6389 | /* One field for array_nested, one field for elem type. */ | |
6390 | strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6391 | new_field->type.atype = lttng_ust_ctl_atype_array_nestable; | |
6392 | new_field->type.u.array_nestable.length = field->type.u.legacy.array.length; | |
6393 | new_field->type.u.array_nestable.alignment = 0; | |
6394 | new_field = &new_fields[++j]; /* elem type */ | |
6395 | new_field->type.atype = field->type.u.legacy.array.elem_type.atype; | |
6396 | assert(new_field->type.atype == lttng_ust_ctl_atype_integer); | |
6397 | new_field->type.u.integer = field->type.u.legacy.array.elem_type.u.basic.integer; | |
6398 | break; | |
6399 | case lttng_ust_ctl_atype_struct: | |
6400 | strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6401 | new_field->type.atype = lttng_ust_ctl_atype_struct_nestable; | |
6402 | new_field->type.u.struct_nestable.nr_fields = field->type.u.legacy._struct.nr_fields; | |
6403 | new_field->type.u.struct_nestable.alignment = 0; | |
6404 | break; | |
6405 | case lttng_ust_ctl_atype_variant: | |
6406 | strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6407 | new_field->type.atype = lttng_ust_ctl_atype_variant_nestable; | |
6408 | new_field->type.u.variant_nestable.nr_choices = field->type.u.legacy.variant.nr_choices; | |
6409 | strncpy(new_field->type.u.variant_nestable.tag_name, | |
6410 | field->type.u.legacy.variant.tag_name, | |
6411 | LTTNG_UST_ABI_SYM_NAME_LEN - 1); | |
6412 | new_field->type.u.variant_nestable.alignment = 0; | |
6413 | break; | |
6414 | default: | |
6415 | *new_field = *field; | |
6416 | break; | |
6417 | } | |
6418 | } | |
6419 | free(fields); | |
6420 | *_fields = new_fields; | |
6421 | *_nr_fields = new_nr_fields; | |
6422 | end: | |
6423 | return ret; | |
6424 | } | |
6425 | ||
d88aee68 DG |
6426 | /* |
6427 | * Reply to a register channel notification from an application on the notify | |
6428 | * socket. The channel metadata is also created. | |
6429 | * | |
6430 | * The session UST registry lock is acquired in this function. | |
6431 | * | |
6432 | * On success 0 is returned else a negative value. | |
6433 | */ | |
8eede835 | 6434 | static int reply_ust_register_channel(int sock, int cobjd, |
b623cb6a | 6435 | size_t nr_fields, struct lttng_ust_ctl_field *fields) |
d0b96690 DG |
6436 | { |
6437 | int ret, ret_code = 0; | |
294e218e | 6438 | uint32_t chan_id; |
7972aab2 | 6439 | uint64_t chan_reg_key; |
fefafa36 | 6440 | enum lttng_ust_ctl_channel_header type = LTTNG_UST_CTL_CHANNEL_HEADER_UNKNOWN; |
d0b96690 DG |
6441 | struct ust_app *app; |
6442 | struct ust_app_channel *ua_chan; | |
6443 | struct ust_app_session *ua_sess; | |
7972aab2 | 6444 | struct ust_registry_session *registry; |
3273699d | 6445 | struct ust_registry_channel *ust_reg_chan; |
d0b96690 DG |
6446 | |
6447 | rcu_read_lock(); | |
6448 | ||
6449 | /* Lookup application. If not found, there is a code flow error. */ | |
6450 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6451 | if (!app) { |
fad1ed2f | 6452 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 | 6453 | sock); |
a5c3235f | 6454 | ret = -1; |
d88aee68 DG |
6455 | goto error_rcu_unlock; |
6456 | } | |
d0b96690 | 6457 | |
4950b860 | 6458 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6459 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6460 | if (!ua_chan) { |
fad1ed2f | 6461 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6462 | ret = 0; |
6463 | goto error_rcu_unlock; | |
6464 | } | |
6465 | ||
d0b96690 DG |
6466 | assert(ua_chan->session); |
6467 | ua_sess = ua_chan->session; | |
d0b96690 | 6468 | |
7972aab2 DG |
6469 | /* Get right session registry depending on the session buffer type. */ |
6470 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6471 | if (!registry) { |
6472 | DBG("Application session is being torn down. Abort event notify"); | |
6473 | ret = 0; | |
6474 | goto error_rcu_unlock; | |
6475 | }; | |
45893984 | 6476 | |
7972aab2 DG |
6477 | /* Depending on the buffer type, a different channel key is used. */ |
6478 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6479 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 6480 | } else { |
7972aab2 | 6481 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
6482 | } |
6483 | ||
7972aab2 DG |
6484 | pthread_mutex_lock(®istry->lock); |
6485 | ||
3273699d FD |
6486 | ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key); |
6487 | assert(ust_reg_chan); | |
7972aab2 | 6488 | |
28dc0326 MD |
6489 | /* Channel id is set during the object creation. */ |
6490 | chan_id = ust_reg_chan->chan_id; | |
6491 | ||
fefafa36 MD |
6492 | ret = ust_app_fixup_legacy_context_fields(&nr_fields, &fields); |
6493 | if (ret < 0) { | |
6494 | ERR("Registering application channel due to legacy context fields fixup error: pid = %d, sock = %d", | |
6495 | app->pid, app->sock); | |
6496 | ret_code = -EINVAL; | |
6497 | goto reply; | |
6498 | } | |
3273699d | 6499 | if (!ust_reg_chan->register_done) { |
294e218e MD |
6500 | /* |
6501 | * TODO: eventually use the registry event count for | |
6502 | * this channel to better guess header type for per-pid | |
6503 | * buffers. | |
6504 | */ | |
b623cb6a | 6505 | type = LTTNG_UST_CTL_CHANNEL_HEADER_LARGE; |
3273699d FD |
6506 | ust_reg_chan->nr_ctx_fields = nr_fields; |
6507 | ust_reg_chan->ctx_fields = fields; | |
fad1ed2f | 6508 | fields = NULL; |
3273699d | 6509 | ust_reg_chan->header_type = type; |
d0b96690 | 6510 | } else { |
7972aab2 | 6511 | /* Get current already assigned values. */ |
3273699d | 6512 | type = ust_reg_chan->header_type; |
28dc0326 MD |
6513 | /* |
6514 | * Validate that the context fields match between | |
6515 | * registry and newcoming application. | |
6516 | */ | |
6517 | if (!match_lttng_ust_ctl_field_array(ust_reg_chan->ctx_fields, | |
6518 | ust_reg_chan->nr_ctx_fields, | |
6519 | fields, nr_fields)) { | |
6520 | ERR("Registering application channel due to context field mismatch: pid = %d, sock = %d", | |
6521 | app->pid, app->sock); | |
6522 | ret_code = -EINVAL; | |
6523 | goto reply; | |
6524 | } | |
d0b96690 | 6525 | } |
d0b96690 DG |
6526 | |
6527 | /* Append to metadata */ | |
3273699d FD |
6528 | if (!ust_reg_chan->metadata_dumped) { |
6529 | ret_code = ust_metadata_channel_statedump(registry, ust_reg_chan); | |
d0b96690 DG |
6530 | if (ret_code) { |
6531 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
6532 | goto reply; | |
6533 | } | |
6534 | } | |
6535 | ||
6536 | reply: | |
7972aab2 | 6537 | DBG3("UST app replying to register channel key %" PRIu64 |
569744c5 | 6538 | " with id %u, type = %d, ret = %d", chan_reg_key, chan_id, type, |
7972aab2 | 6539 | ret_code); |
d0b96690 | 6540 | |
b623cb6a | 6541 | ret = lttng_ust_ctl_reply_register_channel(sock, chan_id, type, ret_code); |
d0b96690 | 6542 | if (ret < 0) { |
569744c5 JR |
6543 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6544 | DBG3("UST app reply channel failed. Application died: pid = %d, sock = %d", | |
6545 | app->pid, app->sock); | |
6546 | } else if (ret == -EAGAIN) { | |
6547 | WARN("UST app reply channel failed. Communication time out: pid = %d, sock = %d", | |
6548 | app->pid, app->sock); | |
d0b96690 | 6549 | } else { |
569744c5 JR |
6550 | ERR("UST app reply channel failed with ret %d: pid = %d, sock = %d", |
6551 | ret, app->pid, app->sock); | |
d0b96690 DG |
6552 | } |
6553 | goto error; | |
6554 | } | |
6555 | ||
7972aab2 | 6556 | /* This channel registry registration is completed. */ |
3273699d | 6557 | ust_reg_chan->register_done = 1; |
7972aab2 | 6558 | |
d0b96690 | 6559 | error: |
7972aab2 | 6560 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6561 | error_rcu_unlock: |
d0b96690 | 6562 | rcu_read_unlock(); |
fad1ed2f | 6563 | free(fields); |
d0b96690 DG |
6564 | return ret; |
6565 | } | |
6566 | ||
d88aee68 DG |
6567 | /* |
6568 | * Add event to the UST channel registry. When the event is added to the | |
6569 | * registry, the metadata is also created. Once done, this replies to the | |
6570 | * application with the appropriate error code. | |
6571 | * | |
6572 | * The session UST registry lock is acquired in the function. | |
6573 | * | |
6574 | * On success 0 is returned else a negative value. | |
6575 | */ | |
d0b96690 | 6576 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
b623cb6a | 6577 | char *sig, size_t nr_fields, struct lttng_ust_ctl_field *fields, |
2106efa0 | 6578 | int loglevel_value, char *model_emf_uri) |
d0b96690 DG |
6579 | { |
6580 | int ret, ret_code; | |
6581 | uint32_t event_id = 0; | |
7972aab2 | 6582 | uint64_t chan_reg_key; |
d0b96690 DG |
6583 | struct ust_app *app; |
6584 | struct ust_app_channel *ua_chan; | |
6585 | struct ust_app_session *ua_sess; | |
7972aab2 | 6586 | struct ust_registry_session *registry; |
d0b96690 DG |
6587 | |
6588 | rcu_read_lock(); | |
6589 | ||
6590 | /* Lookup application. If not found, there is a code flow error. */ | |
6591 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6592 | if (!app) { |
fad1ed2f | 6593 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 | 6594 | sock); |
a5c3235f | 6595 | ret = -1; |
d88aee68 DG |
6596 | goto error_rcu_unlock; |
6597 | } | |
d0b96690 | 6598 | |
4950b860 | 6599 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6600 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6601 | if (!ua_chan) { |
fad1ed2f | 6602 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6603 | ret = 0; |
6604 | goto error_rcu_unlock; | |
6605 | } | |
6606 | ||
d0b96690 DG |
6607 | assert(ua_chan->session); |
6608 | ua_sess = ua_chan->session; | |
6609 | ||
7972aab2 | 6610 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
6611 | if (!registry) { |
6612 | DBG("Application session is being torn down. Abort event notify"); | |
6613 | ret = 0; | |
6614 | goto error_rcu_unlock; | |
6615 | } | |
7972aab2 DG |
6616 | |
6617 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6618 | chan_reg_key = ua_chan->tracing_channel_id; | |
6619 | } else { | |
6620 | chan_reg_key = ua_chan->key; | |
6621 | } | |
6622 | ||
6623 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 6624 | |
d5d629b5 DG |
6625 | /* |
6626 | * From this point on, this call acquires the ownership of the sig, fields | |
6627 | * and model_emf_uri meaning any free are done inside it if needed. These | |
6628 | * three variables MUST NOT be read/write after this. | |
6629 | */ | |
7972aab2 | 6630 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
6631 | sobjd, cobjd, name, sig, nr_fields, fields, |
6632 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
6633 | &event_id, app); | |
fad1ed2f JR |
6634 | sig = NULL; |
6635 | fields = NULL; | |
6636 | model_emf_uri = NULL; | |
d0b96690 DG |
6637 | |
6638 | /* | |
6639 | * The return value is returned to ustctl so in case of an error, the | |
6640 | * application can be notified. In case of an error, it's important not to | |
6641 | * return a negative error or else the application will get closed. | |
6642 | */ | |
b623cb6a | 6643 | ret = lttng_ust_ctl_reply_register_event(sock, event_id, ret_code); |
d0b96690 | 6644 | if (ret < 0) { |
569744c5 JR |
6645 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6646 | DBG3("UST app reply event failed. Application died: pid = %d, sock = %d.", | |
6647 | app->pid, app->sock); | |
6648 | } else if (ret == -EAGAIN) { | |
6649 | WARN("UST app reply event failed. Communication time out: pid = %d, sock = %d", | |
6650 | app->pid, app->sock); | |
d0b96690 | 6651 | } else { |
569744c5 JR |
6652 | ERR("UST app reply event failed with ret %d: pid = %d, sock = %d", |
6653 | ret, app->pid, app->sock); | |
d0b96690 DG |
6654 | } |
6655 | /* | |
6656 | * No need to wipe the create event since the application socket will | |
6657 | * get close on error hence cleaning up everything by itself. | |
6658 | */ | |
6659 | goto error; | |
6660 | } | |
6661 | ||
7972aab2 DG |
6662 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
6663 | name, event_id); | |
d88aee68 | 6664 | |
d0b96690 | 6665 | error: |
7972aab2 | 6666 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6667 | error_rcu_unlock: |
d0b96690 | 6668 | rcu_read_unlock(); |
fad1ed2f JR |
6669 | free(sig); |
6670 | free(fields); | |
6671 | free(model_emf_uri); | |
d0b96690 DG |
6672 | return ret; |
6673 | } | |
6674 | ||
10b56aef MD |
6675 | /* |
6676 | * Add enum to the UST session registry. Once done, this replies to the | |
6677 | * application with the appropriate error code. | |
6678 | * | |
6679 | * The session UST registry lock is acquired within this function. | |
6680 | * | |
6681 | * On success 0 is returned else a negative value. | |
6682 | */ | |
6683 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
b623cb6a | 6684 | struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries) |
10b56aef MD |
6685 | { |
6686 | int ret = 0, ret_code; | |
6687 | struct ust_app *app; | |
6688 | struct ust_app_session *ua_sess; | |
6689 | struct ust_registry_session *registry; | |
6690 | uint64_t enum_id = -1ULL; | |
6691 | ||
6692 | rcu_read_lock(); | |
6693 | ||
6694 | /* Lookup application. If not found, there is a code flow error. */ | |
6695 | app = find_app_by_notify_sock(sock); | |
6696 | if (!app) { | |
6697 | /* Return an error since this is not an error */ | |
6698 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6699 | sock); | |
6700 | free(entries); | |
a5c3235f | 6701 | ret = -1; |
10b56aef MD |
6702 | goto error_rcu_unlock; |
6703 | } | |
6704 | ||
6705 | /* Lookup session by UST object descriptor. */ | |
6706 | ua_sess = find_session_by_objd(app, sobjd); | |
6707 | if (!ua_sess) { | |
6708 | /* Return an error since this is not an error */ | |
fad1ed2f | 6709 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6710 | free(entries); |
6711 | goto error_rcu_unlock; | |
6712 | } | |
6713 | ||
6714 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6715 | if (!registry) { |
6716 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
6717 | free(entries); | |
6718 | goto error_rcu_unlock; | |
6719 | } | |
10b56aef MD |
6720 | |
6721 | pthread_mutex_lock(®istry->lock); | |
6722 | ||
6723 | /* | |
6724 | * From this point on, the callee acquires the ownership of | |
6725 | * entries. The variable entries MUST NOT be read/written after | |
6726 | * call. | |
6727 | */ | |
6728 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6729 | entries, nr_entries, &enum_id); | |
6730 | entries = NULL; | |
6731 | ||
6732 | /* | |
6733 | * The return value is returned to ustctl so in case of an error, the | |
6734 | * application can be notified. In case of an error, it's important not to | |
6735 | * return a negative error or else the application will get closed. | |
6736 | */ | |
b623cb6a | 6737 | ret = lttng_ust_ctl_reply_register_enum(sock, enum_id, ret_code); |
10b56aef | 6738 | if (ret < 0) { |
569744c5 JR |
6739 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6740 | DBG3("UST app reply enum failed. Application died: pid = %d, sock = %d", | |
6741 | app->pid, app->sock); | |
6742 | } else if (ret == -EAGAIN) { | |
6743 | WARN("UST app reply enum failed. Communication time out: pid = %d, sock = %d", | |
6744 | app->pid, app->sock); | |
10b56aef | 6745 | } else { |
569744c5 JR |
6746 | ERR("UST app reply enum failed with ret %d: pid = %d, sock = %d", |
6747 | ret, app->pid, app->sock); | |
10b56aef MD |
6748 | } |
6749 | /* | |
6750 | * No need to wipe the create enum since the application socket will | |
6751 | * get close on error hence cleaning up everything by itself. | |
6752 | */ | |
6753 | goto error; | |
6754 | } | |
6755 | ||
6756 | DBG3("UST registry enum %s added successfully or already found", name); | |
6757 | ||
6758 | error: | |
6759 | pthread_mutex_unlock(®istry->lock); | |
6760 | error_rcu_unlock: | |
6761 | rcu_read_unlock(); | |
6762 | return ret; | |
6763 | } | |
6764 | ||
d88aee68 DG |
6765 | /* |
6766 | * Handle application notification through the given notify socket. | |
6767 | * | |
6768 | * Return 0 on success or else a negative value. | |
6769 | */ | |
d0b96690 DG |
6770 | int ust_app_recv_notify(int sock) |
6771 | { | |
6772 | int ret; | |
b623cb6a | 6773 | enum lttng_ust_ctl_notify_cmd cmd; |
d0b96690 DG |
6774 | |
6775 | DBG3("UST app receiving notify from sock %d", sock); | |
6776 | ||
b623cb6a | 6777 | ret = lttng_ust_ctl_recv_notify(sock, &cmd); |
d0b96690 | 6778 | if (ret < 0) { |
569744c5 JR |
6779 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6780 | DBG3("UST app recv notify failed. Application died: sock = %d", | |
6781 | sock); | |
6782 | } else if (ret == -EAGAIN) { | |
6783 | WARN("UST app recv notify failed. Communication time out: sock = %d", | |
6784 | sock); | |
d0b96690 | 6785 | } else { |
569744c5 JR |
6786 | ERR("UST app recv notify failed with ret %d: sock = %d", |
6787 | ret, sock); | |
d0b96690 DG |
6788 | } |
6789 | goto error; | |
6790 | } | |
6791 | ||
6792 | switch (cmd) { | |
b623cb6a | 6793 | case LTTNG_UST_CTL_NOTIFY_CMD_EVENT: |
d0b96690 | 6794 | { |
2106efa0 | 6795 | int sobjd, cobjd, loglevel_value; |
fc4b93fa | 6796 | char name[LTTNG_UST_ABI_SYM_NAME_LEN], *sig, *model_emf_uri; |
d0b96690 | 6797 | size_t nr_fields; |
b623cb6a | 6798 | struct lttng_ust_ctl_field *fields; |
d0b96690 DG |
6799 | |
6800 | DBG2("UST app ustctl register event received"); | |
6801 | ||
b623cb6a | 6802 | ret = lttng_ust_ctl_recv_register_event(sock, &sobjd, &cobjd, name, |
2106efa0 PP |
6803 | &loglevel_value, &sig, &nr_fields, &fields, |
6804 | &model_emf_uri); | |
d0b96690 | 6805 | if (ret < 0) { |
569744c5 JR |
6806 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6807 | DBG3("UST app recv event failed. Application died: sock = %d", | |
6808 | sock); | |
6809 | } else if (ret == -EAGAIN) { | |
6810 | WARN("UST app recv event failed. Communication time out: sock = %d", | |
6811 | sock); | |
d0b96690 | 6812 | } else { |
569744c5 JR |
6813 | ERR("UST app recv event failed with ret %d: sock = %d", |
6814 | ret, sock); | |
d0b96690 DG |
6815 | } |
6816 | goto error; | |
6817 | } | |
6818 | ||
d5d629b5 DG |
6819 | /* |
6820 | * Add event to the UST registry coming from the notify socket. This | |
6821 | * call will free if needed the sig, fields and model_emf_uri. This | |
6822 | * code path loses the ownsership of these variables and transfer them | |
6823 | * to the this function. | |
6824 | */ | |
d0b96690 | 6825 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6826 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6827 | if (ret < 0) { |
6828 | goto error; | |
6829 | } | |
6830 | ||
6831 | break; | |
6832 | } | |
b623cb6a | 6833 | case LTTNG_UST_CTL_NOTIFY_CMD_CHANNEL: |
d0b96690 DG |
6834 | { |
6835 | int sobjd, cobjd; | |
6836 | size_t nr_fields; | |
b623cb6a | 6837 | struct lttng_ust_ctl_field *fields; |
d0b96690 DG |
6838 | |
6839 | DBG2("UST app ustctl register channel received"); | |
6840 | ||
b623cb6a | 6841 | ret = lttng_ust_ctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, |
d0b96690 DG |
6842 | &fields); |
6843 | if (ret < 0) { | |
569744c5 JR |
6844 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6845 | DBG3("UST app recv channel failed. Application died: sock = %d", | |
6846 | sock); | |
6847 | } else if (ret == -EAGAIN) { | |
6848 | WARN("UST app recv channel failed. Communication time out: sock = %d", | |
6849 | sock); | |
d0b96690 | 6850 | } else { |
569744c5 JR |
6851 | ERR("UST app recv channel failed with ret %d: sock = %d)", |
6852 | ret, sock); | |
d0b96690 DG |
6853 | } |
6854 | goto error; | |
6855 | } | |
6856 | ||
d5d629b5 DG |
6857 | /* |
6858 | * The fields ownership are transfered to this function call meaning | |
6859 | * that if needed it will be freed. After this, it's invalid to access | |
6860 | * fields or clean it up. | |
6861 | */ | |
8eede835 | 6862 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6863 | fields); |
6864 | if (ret < 0) { | |
6865 | goto error; | |
6866 | } | |
6867 | ||
6868 | break; | |
6869 | } | |
b623cb6a | 6870 | case LTTNG_UST_CTL_NOTIFY_CMD_ENUM: |
10b56aef MD |
6871 | { |
6872 | int sobjd; | |
fc4b93fa | 6873 | char name[LTTNG_UST_ABI_SYM_NAME_LEN]; |
10b56aef | 6874 | size_t nr_entries; |
b623cb6a | 6875 | struct lttng_ust_ctl_enum_entry *entries; |
10b56aef MD |
6876 | |
6877 | DBG2("UST app ustctl register enum received"); | |
6878 | ||
b623cb6a | 6879 | ret = lttng_ust_ctl_recv_register_enum(sock, &sobjd, name, |
10b56aef MD |
6880 | &entries, &nr_entries); |
6881 | if (ret < 0) { | |
569744c5 JR |
6882 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
6883 | DBG3("UST app recv enum failed. Application died: sock = %d", | |
6884 | sock); | |
6885 | } else if (ret == -EAGAIN) { | |
6886 | WARN("UST app recv enum failed. Communication time out: sock = %d", | |
6887 | sock); | |
10b56aef | 6888 | } else { |
569744c5 JR |
6889 | ERR("UST app recv enum failed with ret %d: sock = %d", |
6890 | ret, sock); | |
10b56aef MD |
6891 | } |
6892 | goto error; | |
6893 | } | |
6894 | ||
6895 | /* Callee assumes ownership of entries */ | |
6896 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6897 | entries, nr_entries); | |
6898 | if (ret < 0) { | |
6899 | goto error; | |
6900 | } | |
6901 | ||
6902 | break; | |
6903 | } | |
d0b96690 DG |
6904 | default: |
6905 | /* Should NEVER happen. */ | |
6906 | assert(0); | |
6907 | } | |
6908 | ||
6909 | error: | |
6910 | return ret; | |
6911 | } | |
d88aee68 DG |
6912 | |
6913 | /* | |
6914 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6915 | * corresponding application. On failure, the call_rcu to close the socket is | |
6916 | * executed. If an application is found, it tries to delete it from the notify | |
6917 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6918 | * | |
6919 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6920 | * call RCU is not done but the rest of the cleanup is. | |
6921 | */ | |
6922 | void ust_app_notify_sock_unregister(int sock) | |
6923 | { | |
6924 | int err_enomem = 0; | |
6925 | struct lttng_ht_iter iter; | |
6926 | struct ust_app *app; | |
6927 | struct ust_app_notify_sock_obj *obj; | |
6928 | ||
6929 | assert(sock >= 0); | |
6930 | ||
6931 | rcu_read_lock(); | |
6932 | ||
6933 | obj = zmalloc(sizeof(*obj)); | |
6934 | if (!obj) { | |
6935 | /* | |
6936 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6937 | * procedure but the call_rcu will not be called. In this case, we | |
6938 | * accept the fd leak rather than possibly creating an unsynchronized | |
6939 | * state between threads. | |
6940 | * | |
6941 | * TODO: The notify object should be created once the notify socket is | |
6942 | * registered and stored independantely from the ust app object. The | |
6943 | * tricky part is to synchronize the teardown of the application and | |
6944 | * this notify object. Let's keep that in mind so we can avoid this | |
6945 | * kind of shenanigans with ENOMEM in the teardown path. | |
6946 | */ | |
6947 | err_enomem = 1; | |
6948 | } else { | |
6949 | obj->fd = sock; | |
6950 | } | |
6951 | ||
6952 | DBG("UST app notify socket unregister %d", sock); | |
6953 | ||
6954 | /* | |
6955 | * Lookup application by notify socket. If this fails, this means that the | |
6956 | * hash table delete has already been done by the application | |
6957 | * unregistration process so we can safely close the notify socket in a | |
6958 | * call RCU. | |
6959 | */ | |
6960 | app = find_app_by_notify_sock(sock); | |
6961 | if (!app) { | |
6962 | goto close_socket; | |
6963 | } | |
6964 | ||
6965 | iter.iter.node = &app->notify_sock_n.node; | |
6966 | ||
6967 | /* | |
6968 | * Whatever happens here either we fail or succeed, in both cases we have | |
6969 | * to close the socket after a grace period to continue to the call RCU | |
6970 | * here. If the deletion is successful, the application is not visible | |
6971 | * anymore by other threads and is it fails it means that it was already | |
6972 | * deleted from the hash table so either way we just have to close the | |
6973 | * socket. | |
6974 | */ | |
6975 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6976 | ||
6977 | close_socket: | |
6978 | rcu_read_unlock(); | |
6979 | ||
6980 | /* | |
6981 | * Close socket after a grace period to avoid for the socket to be reused | |
6982 | * before the application object is freed creating potential race between | |
6983 | * threads trying to add unique in the global hash table. | |
6984 | */ | |
6985 | if (!err_enomem) { | |
6986 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6987 | } | |
6988 | } | |
f45e313d DG |
6989 | |
6990 | /* | |
6991 | * Destroy a ust app data structure and free its memory. | |
6992 | */ | |
3faa1e3d | 6993 | static void ust_app_destroy(struct ust_app *app) |
f45e313d DG |
6994 | { |
6995 | if (!app) { | |
6996 | return; | |
6997 | } | |
6998 | ||
6999 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
7000 | } | |
6dc3064a DG |
7001 | |
7002 | /* | |
7003 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
7004 | * output. | |
7005 | * | |
9a654598 | 7006 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 7007 | */ |
fb9a95c4 JG |
7008 | enum lttng_error_code ust_app_snapshot_record( |
7009 | const struct ltt_ust_session *usess, | |
348a81dc | 7010 | const struct consumer_output *output, int wait, |
d07ceecd | 7011 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
7012 | { |
7013 | int ret = 0; | |
9a654598 | 7014 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
7015 | struct lttng_ht_iter iter; |
7016 | struct ust_app *app; | |
affce97e | 7017 | char *trace_path = NULL; |
6dc3064a DG |
7018 | |
7019 | assert(usess); | |
7020 | assert(output); | |
7021 | ||
7022 | rcu_read_lock(); | |
7023 | ||
8c924c7b MD |
7024 | switch (usess->buffer_type) { |
7025 | case LTTNG_BUFFER_PER_UID: | |
7026 | { | |
7027 | struct buffer_reg_uid *reg; | |
6dc3064a | 7028 | |
8c924c7b | 7029 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
3273699d | 7030 | struct buffer_reg_channel *buf_reg_chan; |
8c924c7b | 7031 | struct consumer_socket *socket; |
3b967712 | 7032 | char pathname[PATH_MAX]; |
5da88b0f | 7033 | size_t consumer_path_offset = 0; |
6dc3064a | 7034 | |
2b269489 JR |
7035 | if (!reg->registry->reg.ust->metadata_key) { |
7036 | /* Skip since no metadata is present */ | |
7037 | continue; | |
7038 | } | |
7039 | ||
8c924c7b MD |
7040 | /* Get consumer socket to use to push the metadata.*/ |
7041 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7042 | usess->consumer); | |
7043 | if (!socket) { | |
9a654598 | 7044 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
7045 | goto error; |
7046 | } | |
6dc3064a | 7047 | |
8c924c7b MD |
7048 | memset(pathname, 0, sizeof(pathname)); |
7049 | ret = snprintf(pathname, sizeof(pathname), | |
e4061179 | 7050 | DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
7051 | reg->uid, reg->bits_per_long); |
7052 | if (ret < 0) { | |
7053 | PERROR("snprintf snapshot path"); | |
9a654598 | 7054 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
7055 | goto error; |
7056 | } | |
affce97e JG |
7057 | /* Free path allowed on previous iteration. */ |
7058 | free(trace_path); | |
5da88b0f MD |
7059 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
7060 | &consumer_path_offset); | |
3b967712 MD |
7061 | if (!trace_path) { |
7062 | status = LTTNG_ERR_INVALID; | |
7063 | goto error; | |
7064 | } | |
f3db82be | 7065 | /* Add the UST default trace dir to path. */ |
8c924c7b | 7066 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
3273699d | 7067 | buf_reg_chan, node.node) { |
9a654598 | 7068 | status = consumer_snapshot_channel(socket, |
3273699d | 7069 | buf_reg_chan->consumer_key, |
e098433c | 7070 | output, 0, usess->uid, |
5da88b0f | 7071 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 7072 | nb_packets_per_stream); |
9a654598 | 7073 | if (status != LTTNG_OK) { |
8c924c7b MD |
7074 | goto error; |
7075 | } | |
7076 | } | |
9a654598 | 7077 | status = consumer_snapshot_channel(socket, |
68808f4e | 7078 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
7079 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
7080 | wait, 0); | |
9a654598 | 7081 | if (status != LTTNG_OK) { |
8c924c7b MD |
7082 | goto error; |
7083 | } | |
af706bb7 | 7084 | } |
8c924c7b MD |
7085 | break; |
7086 | } | |
7087 | case LTTNG_BUFFER_PER_PID: | |
7088 | { | |
7089 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7090 | struct consumer_socket *socket; | |
7091 | struct lttng_ht_iter chan_iter; | |
7092 | struct ust_app_channel *ua_chan; | |
7093 | struct ust_app_session *ua_sess; | |
7094 | struct ust_registry_session *registry; | |
3b967712 | 7095 | char pathname[PATH_MAX]; |
5da88b0f | 7096 | size_t consumer_path_offset = 0; |
8c924c7b MD |
7097 | |
7098 | ua_sess = lookup_session_by_app(usess, app); | |
7099 | if (!ua_sess) { | |
7100 | /* Session not associated with this app. */ | |
7101 | continue; | |
7102 | } | |
af706bb7 | 7103 | |
8c924c7b MD |
7104 | /* Get the right consumer socket for the application. */ |
7105 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 7106 | output); |
8c924c7b | 7107 | if (!socket) { |
9a654598 | 7108 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
7109 | goto error; |
7110 | } | |
7111 | ||
8c924c7b MD |
7112 | /* Add the UST default trace dir to path. */ |
7113 | memset(pathname, 0, sizeof(pathname)); | |
e4061179 | 7114 | ret = snprintf(pathname, sizeof(pathname), "%s", |
8c924c7b | 7115 | ua_sess->path); |
6dc3064a | 7116 | if (ret < 0) { |
9a654598 | 7117 | status = LTTNG_ERR_INVALID; |
8c924c7b | 7118 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
7119 | goto error; |
7120 | } | |
affce97e JG |
7121 | /* Free path allowed on previous iteration. */ |
7122 | free(trace_path); | |
5da88b0f MD |
7123 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
7124 | &consumer_path_offset); | |
3b967712 MD |
7125 | if (!trace_path) { |
7126 | status = LTTNG_ERR_INVALID; | |
7127 | goto error; | |
7128 | } | |
f3db82be | 7129 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 7130 | ua_chan, node.node) { |
9a654598 | 7131 | status = consumer_snapshot_channel(socket, |
470cc211 | 7132 | ua_chan->key, output, 0, |
ff588497 JR |
7133 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7134 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 7135 | &trace_path[consumer_path_offset], wait, |
d2956687 | 7136 | nb_packets_per_stream); |
9a654598 JG |
7137 | switch (status) { |
7138 | case LTTNG_OK: | |
7139 | break; | |
7140 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
7141 | continue; | |
7142 | default: | |
8c924c7b MD |
7143 | goto error; |
7144 | } | |
7145 | } | |
7146 | ||
7147 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 7148 | if (!registry) { |
9bbfb88c MD |
7149 | DBG("Application session is being torn down. Skip application."); |
7150 | continue; | |
fad1ed2f | 7151 | } |
9a654598 | 7152 | status = consumer_snapshot_channel(socket, |
470cc211 | 7153 | registry->metadata_key, output, 1, |
ff588497 JR |
7154 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7155 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 7156 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
7157 | switch (status) { |
7158 | case LTTNG_OK: | |
7159 | break; | |
7160 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
7161 | continue; | |
7162 | default: | |
8c924c7b MD |
7163 | goto error; |
7164 | } | |
7165 | } | |
7166 | break; | |
7167 | } | |
7168 | default: | |
7169 | assert(0); | |
7170 | break; | |
6dc3064a DG |
7171 | } |
7172 | ||
7173 | error: | |
affce97e | 7174 | free(trace_path); |
6dc3064a | 7175 | rcu_read_unlock(); |
9a654598 | 7176 | return status; |
6dc3064a | 7177 | } |
5c786ded JD |
7178 | |
7179 | /* | |
d07ceecd | 7180 | * Return the size taken by one more packet per stream. |
5c786ded | 7181 | */ |
fb9a95c4 JG |
7182 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
7183 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 7184 | { |
d07ceecd | 7185 | uint64_t tot_size = 0; |
5c786ded JD |
7186 | struct ust_app *app; |
7187 | struct lttng_ht_iter iter; | |
7188 | ||
7189 | assert(usess); | |
7190 | ||
7191 | switch (usess->buffer_type) { | |
7192 | case LTTNG_BUFFER_PER_UID: | |
7193 | { | |
7194 | struct buffer_reg_uid *reg; | |
7195 | ||
7196 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7197 | struct buffer_reg_channel *buf_reg_chan; |
5c786ded | 7198 | |
b7064eaa | 7199 | rcu_read_lock(); |
5c786ded | 7200 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
3273699d FD |
7201 | buf_reg_chan, node.node) { |
7202 | if (cur_nr_packets >= buf_reg_chan->num_subbuf) { | |
d07ceecd MD |
7203 | /* |
7204 | * Don't take channel into account if we | |
7205 | * already grab all its packets. | |
7206 | */ | |
7207 | continue; | |
7208 | } | |
3273699d | 7209 | tot_size += buf_reg_chan->subbuf_size * buf_reg_chan->stream_count; |
5c786ded | 7210 | } |
b7064eaa | 7211 | rcu_read_unlock(); |
5c786ded JD |
7212 | } |
7213 | break; | |
7214 | } | |
7215 | case LTTNG_BUFFER_PER_PID: | |
7216 | { | |
7217 | rcu_read_lock(); | |
7218 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7219 | struct ust_app_channel *ua_chan; | |
7220 | struct ust_app_session *ua_sess; | |
7221 | struct lttng_ht_iter chan_iter; | |
7222 | ||
7223 | ua_sess = lookup_session_by_app(usess, app); | |
7224 | if (!ua_sess) { | |
7225 | /* Session not associated with this app. */ | |
7226 | continue; | |
7227 | } | |
7228 | ||
7229 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7230 | ua_chan, node.node) { | |
d07ceecd MD |
7231 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
7232 | /* | |
7233 | * Don't take channel into account if we | |
7234 | * already grab all its packets. | |
7235 | */ | |
7236 | continue; | |
7237 | } | |
7238 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
7239 | } |
7240 | } | |
7241 | rcu_read_unlock(); | |
7242 | break; | |
7243 | } | |
7244 | default: | |
7245 | assert(0); | |
7246 | break; | |
7247 | } | |
7248 | ||
d07ceecd | 7249 | return tot_size; |
5c786ded | 7250 | } |
fb83fe64 JD |
7251 | |
7252 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
7253 | struct cds_list_head *buffer_reg_uid_list, | |
7254 | struct consumer_output *consumer, uint64_t uchan_id, | |
7255 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
7256 | { | |
7257 | int ret; | |
7258 | uint64_t consumer_chan_key; | |
7259 | ||
70dd8162 MD |
7260 | *discarded = 0; |
7261 | *lost = 0; | |
7262 | ||
fb83fe64 | 7263 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 7264 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 7265 | if (ret < 0) { |
70dd8162 MD |
7266 | /* Not found */ |
7267 | ret = 0; | |
fb83fe64 JD |
7268 | goto end; |
7269 | } | |
7270 | ||
7271 | if (overwrite) { | |
7272 | ret = consumer_get_lost_packets(ust_session_id, | |
7273 | consumer_chan_key, consumer, lost); | |
7274 | } else { | |
7275 | ret = consumer_get_discarded_events(ust_session_id, | |
7276 | consumer_chan_key, consumer, discarded); | |
7277 | } | |
7278 | ||
7279 | end: | |
7280 | return ret; | |
7281 | } | |
7282 | ||
7283 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
7284 | struct ltt_ust_channel *uchan, | |
7285 | struct consumer_output *consumer, int overwrite, | |
7286 | uint64_t *discarded, uint64_t *lost) | |
7287 | { | |
7288 | int ret = 0; | |
7289 | struct lttng_ht_iter iter; | |
7290 | struct lttng_ht_node_str *ua_chan_node; | |
7291 | struct ust_app *app; | |
7292 | struct ust_app_session *ua_sess; | |
7293 | struct ust_app_channel *ua_chan; | |
7294 | ||
70dd8162 MD |
7295 | *discarded = 0; |
7296 | *lost = 0; | |
7297 | ||
fb83fe64 JD |
7298 | rcu_read_lock(); |
7299 | /* | |
70dd8162 MD |
7300 | * Iterate over every registered applications. Sum counters for |
7301 | * all applications containing requested session and channel. | |
fb83fe64 JD |
7302 | */ |
7303 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7304 | struct lttng_ht_iter uiter; | |
7305 | ||
7306 | ua_sess = lookup_session_by_app(usess, app); | |
7307 | if (ua_sess == NULL) { | |
7308 | continue; | |
7309 | } | |
7310 | ||
7311 | /* Get channel */ | |
ee022399 | 7312 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
7313 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
7314 | /* If the session is found for the app, the channel must be there */ | |
7315 | assert(ua_chan_node); | |
7316 | ||
7317 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
7318 | ||
7319 | if (overwrite) { | |
70dd8162 MD |
7320 | uint64_t _lost; |
7321 | ||
fb83fe64 | 7322 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
7323 | consumer, &_lost); |
7324 | if (ret < 0) { | |
7325 | break; | |
7326 | } | |
7327 | (*lost) += _lost; | |
fb83fe64 | 7328 | } else { |
70dd8162 MD |
7329 | uint64_t _discarded; |
7330 | ||
fb83fe64 | 7331 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
7332 | ua_chan->key, consumer, &_discarded); |
7333 | if (ret < 0) { | |
7334 | break; | |
7335 | } | |
7336 | (*discarded) += _discarded; | |
fb83fe64 | 7337 | } |
fb83fe64 JD |
7338 | } |
7339 | ||
fb83fe64 JD |
7340 | rcu_read_unlock(); |
7341 | return ret; | |
7342 | } | |
c2561365 JD |
7343 | |
7344 | static | |
7345 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
7346 | struct ust_app *app) | |
7347 | { | |
7348 | int ret = 0; | |
7349 | struct ust_app_session *ua_sess; | |
7350 | ||
7351 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
7352 | ||
7353 | rcu_read_lock(); | |
7354 | ||
7355 | ua_sess = lookup_session_by_app(usess, app); | |
7356 | if (ua_sess == NULL) { | |
7357 | /* The session is in teardown process. Ignore and continue. */ | |
7358 | goto end; | |
7359 | } | |
7360 | ||
7361 | pthread_mutex_lock(&ua_sess->lock); | |
7362 | ||
7363 | if (ua_sess->deleted) { | |
7364 | goto end_unlock; | |
7365 | } | |
7366 | ||
7367 | pthread_mutex_lock(&app->sock_lock); | |
b623cb6a | 7368 | ret = lttng_ust_ctl_regenerate_statedump(app->sock, ua_sess->handle); |
c2561365 JD |
7369 | pthread_mutex_unlock(&app->sock_lock); |
7370 | ||
7371 | end_unlock: | |
7372 | pthread_mutex_unlock(&ua_sess->lock); | |
7373 | ||
7374 | end: | |
7375 | rcu_read_unlock(); | |
7376 | health_code_update(); | |
7377 | return ret; | |
7378 | } | |
7379 | ||
7380 | /* | |
7381 | * Regenerate the statedump for each app in the session. | |
7382 | */ | |
7383 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
7384 | { | |
7385 | int ret = 0; | |
7386 | struct lttng_ht_iter iter; | |
7387 | struct ust_app *app; | |
7388 | ||
7389 | DBG("Regenerating the metadata for all UST apps"); | |
7390 | ||
7391 | rcu_read_lock(); | |
7392 | ||
7393 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7394 | if (!app->compatible) { | |
7395 | continue; | |
7396 | } | |
7397 | ||
7398 | ret = ust_app_regenerate_statedump(usess, app); | |
7399 | if (ret < 0) { | |
7400 | /* Continue to the next app even on error */ | |
7401 | continue; | |
7402 | } | |
7403 | } | |
7404 | ||
7405 | rcu_read_unlock(); | |
7406 | ||
7407 | return 0; | |
7408 | } | |
5c408ad8 JD |
7409 | |
7410 | /* | |
7411 | * Rotate all the channels of a session. | |
7412 | * | |
6f6d3b69 | 7413 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 7414 | */ |
6f6d3b69 | 7415 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 7416 | { |
6f6d3b69 MD |
7417 | int ret; |
7418 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 | 7419 | struct lttng_ht_iter iter; |
3faa1e3d | 7420 | struct ust_app *app = NULL; |
5c408ad8 | 7421 | struct ltt_ust_session *usess = session->ust_session; |
5c408ad8 JD |
7422 | |
7423 | assert(usess); | |
7424 | ||
7425 | rcu_read_lock(); | |
7426 | ||
7427 | switch (usess->buffer_type) { | |
7428 | case LTTNG_BUFFER_PER_UID: | |
7429 | { | |
7430 | struct buffer_reg_uid *reg; | |
7431 | ||
7432 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7433 | struct buffer_reg_channel *buf_reg_chan; |
5c408ad8 JD |
7434 | struct consumer_socket *socket; |
7435 | ||
7436 | /* Get consumer socket to use to push the metadata.*/ | |
7437 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7438 | usess->consumer); | |
7439 | if (!socket) { | |
6f6d3b69 | 7440 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7441 | goto error; |
7442 | } | |
7443 | ||
5c408ad8 JD |
7444 | /* Rotate the data channels. */ |
7445 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3273699d | 7446 | buf_reg_chan, node.node) { |
5c408ad8 | 7447 | ret = consumer_rotate_channel(socket, |
3273699d | 7448 | buf_reg_chan->consumer_key, |
5c408ad8 | 7449 | usess->uid, usess->gid, |
d2956687 JG |
7450 | usess->consumer, |
7451 | /* is_metadata_channel */ false); | |
5c408ad8 | 7452 | if (ret < 0) { |
6f6d3b69 | 7453 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7454 | goto error; |
7455 | } | |
7456 | } | |
7457 | ||
db786d44 JR |
7458 | /* |
7459 | * The metadata channel might not be present. | |
7460 | * | |
7461 | * Consumer stream allocation can be done | |
7462 | * asynchronously and can fail on intermediary | |
7463 | * operations (i.e add context) and lead to data | |
7464 | * channels created with no metadata channel. | |
7465 | */ | |
7466 | if (!reg->registry->reg.ust->metadata_key) { | |
7467 | /* Skip since no metadata is present. */ | |
7468 | continue; | |
7469 | } | |
7470 | ||
5c408ad8 JD |
7471 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); |
7472 | ||
7473 | ret = consumer_rotate_channel(socket, | |
7474 | reg->registry->reg.ust->metadata_key, | |
7475 | usess->uid, usess->gid, | |
d2956687 JG |
7476 | usess->consumer, |
7477 | /* is_metadata_channel */ true); | |
5c408ad8 | 7478 | if (ret < 0) { |
6f6d3b69 | 7479 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7480 | goto error; |
7481 | } | |
5c408ad8 JD |
7482 | } |
7483 | break; | |
7484 | } | |
7485 | case LTTNG_BUFFER_PER_PID: | |
7486 | { | |
7487 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7488 | struct consumer_socket *socket; | |
7489 | struct lttng_ht_iter chan_iter; | |
7490 | struct ust_app_channel *ua_chan; | |
7491 | struct ust_app_session *ua_sess; | |
7492 | struct ust_registry_session *registry; | |
3faa1e3d JG |
7493 | bool app_reference_taken; |
7494 | ||
7495 | app_reference_taken = ust_app_get(app); | |
7496 | if (!app_reference_taken) { | |
7497 | /* Application unregistered concurrently, skip it. */ | |
7498 | DBG("Could not get application reference as it is being torn down; skipping application"); | |
7499 | continue; | |
7500 | } | |
5c408ad8 JD |
7501 | |
7502 | ua_sess = lookup_session_by_app(usess, app); | |
7503 | if (!ua_sess) { | |
7504 | /* Session not associated with this app. */ | |
3faa1e3d JG |
7505 | ust_app_put(app); |
7506 | app = NULL; | |
5c408ad8 JD |
7507 | continue; |
7508 | } | |
5c408ad8 JD |
7509 | |
7510 | /* Get the right consumer socket for the application. */ | |
7511 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7512 | usess->consumer); | |
7513 | if (!socket) { | |
6f6d3b69 | 7514 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7515 | goto error; |
7516 | } | |
7517 | ||
3faa1e3d | 7518 | |
5c408ad8 | 7519 | registry = get_session_registry(ua_sess); |
3faa1e3d | 7520 | assert(registry); |
5c408ad8 | 7521 | |
5c408ad8 JD |
7522 | /* Rotate the data channels. */ |
7523 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7524 | ua_chan, node.node) { | |
470cc211 JG |
7525 | ret = consumer_rotate_channel(socket, |
7526 | ua_chan->key, | |
ff588497 JR |
7527 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7528 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7529 | ua_sess->consumer, |
7530 | /* is_metadata_channel */ false); | |
5c408ad8 | 7531 | if (ret < 0) { |
6f6d3b69 | 7532 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7533 | goto error; |
7534 | } | |
7535 | } | |
7536 | ||
7537 | /* Rotate the metadata channel. */ | |
7538 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
7539 | ret = consumer_rotate_channel(socket, |
7540 | registry->metadata_key, | |
ff588497 JR |
7541 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7542 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7543 | ua_sess->consumer, |
7544 | /* is_metadata_channel */ true); | |
5c408ad8 | 7545 | if (ret < 0) { |
6f6d3b69 | 7546 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7547 | goto error; |
7548 | } | |
3faa1e3d JG |
7549 | |
7550 | ust_app_put(app); | |
7551 | app = NULL; | |
5c408ad8 | 7552 | } |
3faa1e3d JG |
7553 | |
7554 | app = NULL; | |
5c408ad8 JD |
7555 | break; |
7556 | } | |
7557 | default: | |
7558 | assert(0); | |
7559 | break; | |
7560 | } | |
7561 | ||
6f6d3b69 | 7562 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
7563 | |
7564 | error: | |
3faa1e3d | 7565 | ust_app_put(app); |
5c408ad8 | 7566 | rcu_read_unlock(); |
6f6d3b69 | 7567 | return cmd_ret; |
5c408ad8 | 7568 | } |
d2956687 JG |
7569 | |
7570 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
7571 | const struct ltt_ust_session *usess) | |
7572 | { | |
7573 | enum lttng_error_code ret = LTTNG_OK; | |
7574 | struct lttng_ht_iter iter; | |
7575 | enum lttng_trace_chunk_status chunk_status; | |
7576 | char *pathname_index; | |
7577 | int fmt_ret; | |
7578 | ||
7579 | assert(usess->current_trace_chunk); | |
7580 | rcu_read_lock(); | |
7581 | ||
7582 | switch (usess->buffer_type) { | |
7583 | case LTTNG_BUFFER_PER_UID: | |
7584 | { | |
7585 | struct buffer_reg_uid *reg; | |
7586 | ||
7587 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7588 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7589 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7590 | reg->uid, reg->bits_per_long); |
7591 | if (fmt_ret < 0) { | |
7592 | ERR("Failed to format channel index directory"); | |
7593 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7594 | goto error; | |
7595 | } | |
7596 | ||
7597 | /* | |
7598 | * Create the index subdirectory which will take care | |
7599 | * of implicitly creating the channel's path. | |
7600 | */ | |
7601 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7602 | usess->current_trace_chunk, | |
7603 | pathname_index); | |
7604 | free(pathname_index); | |
7605 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7606 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7607 | goto error; | |
7608 | } | |
7609 | } | |
7610 | break; | |
7611 | } | |
7612 | case LTTNG_BUFFER_PER_PID: | |
7613 | { | |
7614 | struct ust_app *app; | |
7615 | ||
495dece5 MD |
7616 | /* |
7617 | * Create the toplevel ust/ directory in case no apps are running. | |
7618 | */ | |
7619 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7620 | usess->current_trace_chunk, | |
7621 | DEFAULT_UST_TRACE_DIR); | |
7622 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7623 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7624 | goto error; | |
7625 | } | |
7626 | ||
d2956687 JG |
7627 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
7628 | pid_n.node) { | |
7629 | struct ust_app_session *ua_sess; | |
7630 | struct ust_registry_session *registry; | |
7631 | ||
7632 | ua_sess = lookup_session_by_app(usess, app); | |
7633 | if (!ua_sess) { | |
7634 | /* Session not associated with this app. */ | |
7635 | continue; | |
7636 | } | |
7637 | ||
7638 | registry = get_session_registry(ua_sess); | |
7639 | if (!registry) { | |
7640 | DBG("Application session is being torn down. Skip application."); | |
7641 | continue; | |
7642 | } | |
7643 | ||
7644 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7645 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7646 | ua_sess->path); |
7647 | if (fmt_ret < 0) { | |
7648 | ERR("Failed to format channel index directory"); | |
7649 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7650 | goto error; | |
7651 | } | |
7652 | /* | |
7653 | * Create the index subdirectory which will take care | |
7654 | * of implicitly creating the channel's path. | |
7655 | */ | |
7656 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7657 | usess->current_trace_chunk, | |
7658 | pathname_index); | |
7659 | free(pathname_index); | |
7660 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7661 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7662 | goto error; | |
7663 | } | |
7664 | } | |
7665 | break; | |
7666 | } | |
7667 | default: | |
7668 | abort(); | |
7669 | } | |
7670 | ||
7671 | ret = LTTNG_OK; | |
7672 | error: | |
7673 | rcu_read_unlock(); | |
7674 | return ret; | |
7675 | } | |
4a9b9759 MD |
7676 | |
7677 | /* | |
7678 | * Clear all the channels of a session. | |
7679 | * | |
7680 | * Return LTTNG_OK on success or else an LTTng error code. | |
7681 | */ | |
7682 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
7683 | { | |
7684 | int ret; | |
7685 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
7686 | struct lttng_ht_iter iter; | |
7687 | struct ust_app *app; | |
7688 | struct ltt_ust_session *usess = session->ust_session; | |
7689 | ||
7690 | assert(usess); | |
7691 | ||
7692 | rcu_read_lock(); | |
7693 | ||
7694 | if (usess->active) { | |
7695 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
7696 | cmd_ret = LTTNG_ERR_FATAL; | |
7697 | goto end; | |
7698 | } | |
7699 | ||
7700 | switch (usess->buffer_type) { | |
7701 | case LTTNG_BUFFER_PER_UID: | |
7702 | { | |
7703 | struct buffer_reg_uid *reg; | |
7704 | ||
7705 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7706 | struct buffer_reg_channel *buf_reg_chan; |
4a9b9759 MD |
7707 | struct consumer_socket *socket; |
7708 | ||
7709 | /* Get consumer socket to use to push the metadata.*/ | |
7710 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7711 | usess->consumer); | |
7712 | if (!socket) { | |
7713 | cmd_ret = LTTNG_ERR_INVALID; | |
7714 | goto error_socket; | |
7715 | } | |
7716 | ||
7717 | /* Clear the data channels. */ | |
7718 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3273699d | 7719 | buf_reg_chan, node.node) { |
4a9b9759 | 7720 | ret = consumer_clear_channel(socket, |
3273699d | 7721 | buf_reg_chan->consumer_key); |
4a9b9759 MD |
7722 | if (ret < 0) { |
7723 | goto error; | |
7724 | } | |
7725 | } | |
7726 | ||
7727 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7728 | ||
7729 | /* | |
7730 | * Clear the metadata channel. | |
7731 | * Metadata channel is not cleared per se but we still need to | |
7732 | * perform a rotation operation on it behind the scene. | |
7733 | */ | |
7734 | ret = consumer_clear_channel(socket, | |
7735 | reg->registry->reg.ust->metadata_key); | |
7736 | if (ret < 0) { | |
7737 | goto error; | |
7738 | } | |
7739 | } | |
7740 | break; | |
7741 | } | |
7742 | case LTTNG_BUFFER_PER_PID: | |
7743 | { | |
7744 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7745 | struct consumer_socket *socket; | |
7746 | struct lttng_ht_iter chan_iter; | |
7747 | struct ust_app_channel *ua_chan; | |
7748 | struct ust_app_session *ua_sess; | |
7749 | struct ust_registry_session *registry; | |
7750 | ||
7751 | ua_sess = lookup_session_by_app(usess, app); | |
7752 | if (!ua_sess) { | |
7753 | /* Session not associated with this app. */ | |
7754 | continue; | |
7755 | } | |
7756 | ||
7757 | /* Get the right consumer socket for the application. */ | |
7758 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7759 | usess->consumer); | |
7760 | if (!socket) { | |
7761 | cmd_ret = LTTNG_ERR_INVALID; | |
7762 | goto error_socket; | |
7763 | } | |
7764 | ||
7765 | registry = get_session_registry(ua_sess); | |
7766 | if (!registry) { | |
7767 | DBG("Application session is being torn down. Skip application."); | |
7768 | continue; | |
7769 | } | |
7770 | ||
7771 | /* Clear the data channels. */ | |
7772 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7773 | ua_chan, node.node) { | |
7774 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7775 | if (ret < 0) { | |
7776 | /* Per-PID buffer and application going away. */ | |
7777 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7778 | continue; | |
7779 | } | |
7780 | goto error; | |
7781 | } | |
7782 | } | |
7783 | ||
7784 | (void) push_metadata(registry, usess->consumer); | |
7785 | ||
7786 | /* | |
7787 | * Clear the metadata channel. | |
7788 | * Metadata channel is not cleared per se but we still need to | |
7789 | * perform rotation operation on it behind the scene. | |
7790 | */ | |
7791 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7792 | if (ret < 0) { | |
7793 | /* Per-PID buffer and application going away. */ | |
7794 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7795 | continue; | |
7796 | } | |
7797 | goto error; | |
7798 | } | |
7799 | } | |
7800 | break; | |
7801 | } | |
7802 | default: | |
7803 | assert(0); | |
7804 | break; | |
7805 | } | |
7806 | ||
7807 | cmd_ret = LTTNG_OK; | |
7808 | goto end; | |
7809 | ||
7810 | error: | |
7811 | switch (-ret) { | |
7812 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7813 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7814 | break; | |
7815 | default: | |
7816 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7817 | } | |
7818 | ||
7819 | error_socket: | |
7820 | end: | |
7821 | rcu_read_unlock(); | |
7822 | return cmd_ret; | |
7823 | } | |
04ed9e10 JG |
7824 | |
7825 | /* | |
7826 | * This function skips the metadata channel as the begin/end timestamps of a | |
7827 | * metadata packet are useless. | |
7828 | * | |
7829 | * Moreover, opening a packet after a "clear" will cause problems for live | |
7830 | * sessions as it will introduce padding that was not part of the first trace | |
7831 | * chunk. The relay daemon expects the content of the metadata stream of | |
7832 | * successive metadata trace chunks to be strict supersets of one another. | |
7833 | * | |
7834 | * For example, flushing a packet at the beginning of the metadata stream of | |
7835 | * a trace chunk resulting from a "clear" session command will cause the | |
7836 | * size of the metadata stream of the new trace chunk to not match the size of | |
7837 | * the metadata stream of the original chunk. This will confuse the relay | |
7838 | * daemon as the same "offset" in a metadata stream will no longer point | |
7839 | * to the same content. | |
7840 | */ | |
7841 | enum lttng_error_code ust_app_open_packets(struct ltt_session *session) | |
7842 | { | |
7843 | enum lttng_error_code ret = LTTNG_OK; | |
7844 | struct lttng_ht_iter iter; | |
7845 | struct ltt_ust_session *usess = session->ust_session; | |
7846 | ||
7847 | assert(usess); | |
7848 | ||
7849 | rcu_read_lock(); | |
7850 | ||
7851 | switch (usess->buffer_type) { | |
7852 | case LTTNG_BUFFER_PER_UID: | |
7853 | { | |
7854 | struct buffer_reg_uid *reg; | |
7855 | ||
7856 | cds_list_for_each_entry ( | |
7857 | reg, &usess->buffer_reg_uid_list, lnode) { | |
3273699d | 7858 | struct buffer_reg_channel *buf_reg_chan; |
04ed9e10 JG |
7859 | struct consumer_socket *socket; |
7860 | ||
7861 | socket = consumer_find_socket_by_bitness( | |
7862 | reg->bits_per_long, usess->consumer); | |
7863 | if (!socket) { | |
7864 | ret = LTTNG_ERR_FATAL; | |
7865 | goto error; | |
7866 | } | |
7867 | ||
7868 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
3273699d | 7869 | &iter.iter, buf_reg_chan, node.node) { |
04ed9e10 JG |
7870 | const int open_ret = |
7871 | consumer_open_channel_packets( | |
7872 | socket, | |
3273699d | 7873 | buf_reg_chan->consumer_key); |
04ed9e10 JG |
7874 | |
7875 | if (open_ret < 0) { | |
7876 | ret = LTTNG_ERR_UNK; | |
7877 | goto error; | |
7878 | } | |
7879 | } | |
7880 | } | |
7881 | break; | |
7882 | } | |
7883 | case LTTNG_BUFFER_PER_PID: | |
7884 | { | |
7885 | struct ust_app *app; | |
7886 | ||
7887 | cds_lfht_for_each_entry ( | |
7888 | ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7889 | struct consumer_socket *socket; | |
7890 | struct lttng_ht_iter chan_iter; | |
7891 | struct ust_app_channel *ua_chan; | |
7892 | struct ust_app_session *ua_sess; | |
7893 | struct ust_registry_session *registry; | |
7894 | ||
7895 | ua_sess = lookup_session_by_app(usess, app); | |
7896 | if (!ua_sess) { | |
7897 | /* Session not associated with this app. */ | |
7898 | continue; | |
7899 | } | |
7900 | ||
7901 | /* Get the right consumer socket for the application. */ | |
7902 | socket = consumer_find_socket_by_bitness( | |
7903 | app->bits_per_long, usess->consumer); | |
7904 | if (!socket) { | |
7905 | ret = LTTNG_ERR_FATAL; | |
7906 | goto error; | |
7907 | } | |
7908 | ||
7909 | registry = get_session_registry(ua_sess); | |
7910 | if (!registry) { | |
7911 | DBG("Application session is being torn down. Skip application."); | |
7912 | continue; | |
7913 | } | |
7914 | ||
7915 | cds_lfht_for_each_entry(ua_sess->channels->ht, | |
7916 | &chan_iter.iter, ua_chan, node.node) { | |
7917 | const int open_ret = | |
7918 | consumer_open_channel_packets( | |
7919 | socket, | |
7920 | ua_chan->key); | |
7921 | ||
7922 | if (open_ret < 0) { | |
7923 | /* | |
7924 | * Per-PID buffer and application going | |
7925 | * away. | |
7926 | */ | |
97a171e1 | 7927 | if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
04ed9e10 JG |
7928 | continue; |
7929 | } | |
7930 | ||
7931 | ret = LTTNG_ERR_UNK; | |
7932 | goto error; | |
7933 | } | |
7934 | } | |
7935 | } | |
7936 | break; | |
7937 | } | |
7938 | default: | |
7939 | abort(); | |
7940 | break; | |
7941 | } | |
7942 | ||
7943 | error: | |
7944 | rcu_read_unlock(); | |
7945 | return ret; | |
7946 | } | |
3faa1e3d JG |
7947 | |
7948 | static void ust_app_release(struct urcu_ref *ref) | |
7949 | { | |
7950 | struct ust_app *app = container_of(ref, struct ust_app, ref); | |
7951 | ||
7952 | ust_app_unregister(app); | |
7953 | ust_app_destroy(app); | |
7954 | } | |
7955 | ||
7956 | bool ust_app_get(struct ust_app *app) | |
7957 | { | |
7958 | assert(app); | |
7959 | return urcu_ref_get_unless_zero(&app->ref); | |
7960 | } | |
7961 | ||
7962 | void ust_app_put(struct ust_app *app) | |
7963 | { | |
7964 | if (!app) { | |
7965 | return; | |
7966 | } | |
7967 | ||
7968 | urcu_ref_put(&app->ref, ust_app_release); | |
7969 | } |