Fix: sessiond: assertion fails when getting name of trigger
[lttng-tools.git] / src / bin / lttng-sessiond / action-executor.c
1 /*
2 * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #include "action-executor.h"
9 #include "cmd.h"
10 #include "health-sessiond.h"
11 #include "lttng-sessiond.h"
12 #include "notification-thread-internal.h"
13 #include "session.h"
14 #include "thread.h"
15 #include <common/macros.h>
16 #include <common/optional.h>
17 #include <lttng/action/action-internal.h>
18 #include <lttng/action/group.h>
19 #include <lttng/action/notify.h>
20 #include <lttng/action/rotate-session.h>
21 #include <lttng/action/snapshot-session.h>
22 #include <lttng/action/start-session.h>
23 #include <lttng/action/stop-session.h>
24 #include <lttng/condition/evaluation.h>
25 #include <lttng/condition/event-rule-internal.h>
26 #include <lttng/lttng-error.h>
27 #include <lttng/trigger/trigger-internal.h>
28 #include <pthread.h>
29 #include <stdbool.h>
30 #include <stddef.h>
31 #include <urcu/list.h>
32
33 #define THREAD_NAME "Action Executor"
34 #define MAX_QUEUED_WORK_COUNT 8192
35
36 struct action_work_item {
37 uint64_t id;
38 struct lttng_trigger *trigger;
39 struct lttng_evaluation *evaluation;
40 struct notification_client_list *client_list;
41 LTTNG_OPTIONAL(struct lttng_credentials) object_creds;
42 struct cds_list_head list_node;
43 };
44
45 struct action_executor {
46 struct lttng_thread *thread;
47 struct notification_thread_handle *notification_thread_handle;
48 struct {
49 uint64_t pending_count;
50 struct cds_list_head list;
51 pthread_cond_t cond;
52 pthread_mutex_t lock;
53 } work;
54 bool should_quit;
55 uint64_t next_work_item_id;
56 };
57
58 /*
59 * Only return non-zero on a fatal error that should shut down the action
60 * executor.
61 */
62 typedef int (*action_executor_handler)(struct action_executor *executor,
63 const struct action_work_item *,
64 const struct lttng_action *action);
65
66 static int action_executor_notify_handler(struct action_executor *executor,
67 const struct action_work_item *,
68 const struct lttng_action *);
69 static int action_executor_start_session_handler(struct action_executor *executor,
70 const struct action_work_item *,
71 const struct lttng_action *);
72 static int action_executor_stop_session_handler(struct action_executor *executor,
73 const struct action_work_item *,
74 const struct lttng_action *);
75 static int action_executor_rotate_session_handler(struct action_executor *executor,
76 const struct action_work_item *,
77 const struct lttng_action *);
78 static int action_executor_snapshot_session_handler(struct action_executor *executor,
79 const struct action_work_item *,
80 const struct lttng_action *);
81 static int action_executor_group_handler(struct action_executor *executor,
82 const struct action_work_item *,
83 const struct lttng_action *);
84 static int action_executor_generic_handler(struct action_executor *executor,
85 const struct action_work_item *,
86 const struct lttng_action *);
87
88 static const action_executor_handler action_executors[] = {
89 [LTTNG_ACTION_TYPE_NOTIFY] = action_executor_notify_handler,
90 [LTTNG_ACTION_TYPE_START_SESSION] = action_executor_start_session_handler,
91 [LTTNG_ACTION_TYPE_STOP_SESSION] = action_executor_stop_session_handler,
92 [LTTNG_ACTION_TYPE_ROTATE_SESSION] = action_executor_rotate_session_handler,
93 [LTTNG_ACTION_TYPE_SNAPSHOT_SESSION] = action_executor_snapshot_session_handler,
94 [LTTNG_ACTION_TYPE_GROUP] = action_executor_group_handler,
95 };
96
97 static const char *action_type_names[] = {
98 [LTTNG_ACTION_TYPE_NOTIFY] = "Notify",
99 [LTTNG_ACTION_TYPE_START_SESSION] = "Start session",
100 [LTTNG_ACTION_TYPE_STOP_SESSION] = "Stop session",
101 [LTTNG_ACTION_TYPE_ROTATE_SESSION] = "Rotate session",
102 [LTTNG_ACTION_TYPE_SNAPSHOT_SESSION] = "Snapshot session",
103 [LTTNG_ACTION_TYPE_GROUP] = "Group",
104 };
105
106 static const char *get_action_name(const struct lttng_action *action)
107 {
108 const enum lttng_action_type action_type = lttng_action_get_type(action);
109
110 assert(action_type != LTTNG_ACTION_TYPE_UNKNOWN);
111
112 return action_type_names[action_type];
113 }
114
115 /* Check if this trigger allowed to interect with a given session. */
116 static bool is_trigger_allowed_for_session(const struct lttng_trigger *trigger,
117 struct ltt_session *session)
118 {
119 bool is_allowed = false;
120 const struct lttng_credentials session_creds = {
121 .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid),
122 .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid),
123 };
124 /* Can never be NULL. */
125 const struct lttng_credentials *trigger_creds =
126 lttng_trigger_get_credentials(trigger);
127
128 is_allowed = (lttng_credentials_is_equal_uid(trigger_creds, &session_creds)) ||
129 (lttng_credentials_get_uid(trigger_creds) == 0);
130 if (!is_allowed) {
131 WARN("Trigger is not allowed to interact with session `%s`: session uid = %ld, session gid = %ld, trigger uid = %ld",
132 session->name,
133 (long int) session->uid,
134 (long int) session->gid,
135 (long int) lttng_credentials_get_uid(trigger_creds));
136 }
137
138 return is_allowed;
139 }
140
141 static const char *get_trigger_name(const struct lttng_trigger *trigger)
142 {
143 const char *trigger_name;
144 enum lttng_trigger_status trigger_status;
145
146 trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
147 assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
148
149 return trigger_name;
150 }
151
152 static int client_handle_transmission_status(
153 struct notification_client *client,
154 enum client_transmission_status status,
155 void *user_data)
156 {
157 int ret = 0;
158 struct action_executor *executor = user_data;
159 bool update_communication = true;
160
161 switch (status) {
162 case CLIENT_TRANSMISSION_STATUS_COMPLETE:
163 DBG("Successfully sent full notification to client, client_id = %" PRIu64,
164 client->id);
165 update_communication = false;
166 break;
167 case CLIENT_TRANSMISSION_STATUS_QUEUED:
168 DBG("Queued notification in client outgoing buffer, client_id = %" PRIu64,
169 client->id);
170 break;
171 case CLIENT_TRANSMISSION_STATUS_FAIL:
172 DBG("Communication error occurred while sending notification to client, client_id = %" PRIu64,
173 client->id);
174 break;
175 default:
176 ERR("Fatal error encoutered while sending notification to client, client_id = %" PRIu64,
177 client->id);
178 ret = -1;
179 goto end;
180 }
181
182 if (!update_communication) {
183 goto end;
184 }
185
186 /* Safe to read client's id without locking as it is immutable. */
187 ret = notification_thread_client_communication_update(
188 executor->notification_thread_handle, client->id,
189 status);
190 end:
191 return ret;
192 }
193
194 static int action_executor_notify_handler(struct action_executor *executor,
195 const struct action_work_item *work_item,
196 const struct lttng_action *action)
197 {
198 return notification_client_list_send_evaluation(work_item->client_list,
199 lttng_trigger_get_const_condition(work_item->trigger),
200 work_item->evaluation,
201 lttng_trigger_get_credentials(work_item->trigger),
202 work_item->object_creds.is_set ?
203 &(work_item->object_creds.value) :
204 NULL,
205 client_handle_transmission_status, executor);
206 }
207
208 static int action_executor_start_session_handler(struct action_executor *executor,
209 const struct action_work_item *work_item,
210 const struct lttng_action *action)
211 {
212 int ret = 0;
213 const char *session_name;
214 enum lttng_action_status action_status;
215 struct ltt_session *session;
216 enum lttng_error_code cmd_ret;
217
218 action_status = lttng_action_start_session_get_session_name(
219 action, &session_name);
220 if (action_status != LTTNG_ACTION_STATUS_OK) {
221 ERR("Failed to get session name from `%s` action",
222 get_action_name(action));
223 ret = -1;
224 goto end;
225 }
226
227 session_lock_list();
228 session = session_find_by_name(session_name);
229 if (!session) {
230 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
231 session_name, get_action_name(action),
232 get_trigger_name(work_item->trigger));
233 goto error_unlock_list;
234 }
235
236 session_lock(session);
237 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
238 goto error_dispose_session;
239 }
240
241 cmd_ret = cmd_start_trace(session);
242 switch (cmd_ret) {
243 case LTTNG_OK:
244 DBG("Successfully started session `%s` on behalf of trigger `%s`",
245 session_name, get_trigger_name(work_item->trigger));
246 break;
247 case LTTNG_ERR_TRACE_ALREADY_STARTED:
248 DBG("Attempted to start session `%s` on behalf of trigger `%s` but it was already started",
249 session_name, get_trigger_name(work_item->trigger));
250 break;
251 default:
252 WARN("Failed to start session `%s` on behalf of trigger `%s`: %s",
253 session_name, get_trigger_name(work_item->trigger),
254 lttng_strerror(-cmd_ret));
255 break;
256 }
257
258 error_dispose_session:
259 session_unlock(session);
260 session_put(session);
261 error_unlock_list:
262 session_unlock_list();
263 end:
264 return ret;
265 }
266
267 static int action_executor_stop_session_handler(struct action_executor *executor,
268 const struct action_work_item *work_item,
269 const struct lttng_action *action)
270 {
271 int ret = 0;
272 const char *session_name;
273 enum lttng_action_status action_status;
274 struct ltt_session *session;
275 enum lttng_error_code cmd_ret;
276
277 action_status = lttng_action_stop_session_get_session_name(
278 action, &session_name);
279 if (action_status != LTTNG_ACTION_STATUS_OK) {
280 ERR("Failed to get session name from `%s` action",
281 get_action_name(action));
282 ret = -1;
283 goto end;
284 }
285
286 session_lock_list();
287 session = session_find_by_name(session_name);
288 if (!session) {
289 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
290 session_name, get_action_name(action),
291 get_trigger_name(work_item->trigger));
292 goto error_unlock_list;
293 }
294
295 session_lock(session);
296 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
297 goto error_dispose_session;
298 }
299
300 cmd_ret = cmd_stop_trace(session);
301 switch (cmd_ret) {
302 case LTTNG_OK:
303 DBG("Successfully stopped session `%s` on behalf of trigger `%s`",
304 session_name, get_trigger_name(work_item->trigger));
305 break;
306 case LTTNG_ERR_TRACE_ALREADY_STOPPED:
307 DBG("Attempted to stop session `%s` on behalf of trigger `%s` but it was already stopped",
308 session_name, get_trigger_name(work_item->trigger));
309 break;
310 default:
311 WARN("Failed to stop session `%s` on behalf of trigger `%s`: %s",
312 session_name, get_trigger_name(work_item->trigger),
313 lttng_strerror(-cmd_ret));
314 break;
315 }
316
317 error_dispose_session:
318 session_unlock(session);
319 session_put(session);
320 error_unlock_list:
321 session_unlock_list();
322 end:
323 return ret;
324 }
325
326 static int action_executor_rotate_session_handler(struct action_executor *executor,
327 const struct action_work_item *work_item,
328 const struct lttng_action *action)
329 {
330 int ret = 0;
331 const char *session_name;
332 enum lttng_action_status action_status;
333 struct ltt_session *session;
334 enum lttng_error_code cmd_ret;
335
336 action_status = lttng_action_rotate_session_get_session_name(
337 action, &session_name);
338 if (action_status != LTTNG_ACTION_STATUS_OK) {
339 ERR("Failed to get session name from `%s` action",
340 get_action_name(action));
341 ret = -1;
342 goto end;
343 }
344
345 session_lock_list();
346 session = session_find_by_name(session_name);
347 if (!session) {
348 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%s`",
349 session_name, get_action_name(action),
350 get_trigger_name(work_item->trigger));
351 goto error_unlock_list;
352 }
353
354 session_lock(session);
355 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
356 goto error_dispose_session;
357 }
358
359 cmd_ret = cmd_rotate_session(session, NULL, false,
360 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
361 switch (cmd_ret) {
362 case LTTNG_OK:
363 DBG("Successfully started rotation of session `%s` on behalf of trigger `%s`",
364 session_name, get_trigger_name(work_item->trigger));
365 break;
366 case LTTNG_ERR_ROTATION_PENDING:
367 DBG("Attempted to start a rotation of session `%s` on behalf of trigger `%s` but a rotation is already ongoing",
368 session_name, get_trigger_name(work_item->trigger));
369 break;
370 case LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP:
371 case LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR:
372 DBG("Attempted to start a rotation of session `%s` on behalf of trigger `%s` but a rotation has already been completed since the last stop or clear",
373 session_name, get_trigger_name(work_item->trigger));
374 break;
375 default:
376 WARN("Failed to start a rotation of session `%s` on behalf of trigger `%s`: %s",
377 session_name, get_trigger_name(work_item->trigger),
378 lttng_strerror(-cmd_ret));
379 break;
380 }
381
382 error_dispose_session:
383 session_unlock(session);
384 session_put(session);
385 error_unlock_list:
386 session_unlock_list();
387 end:
388 return ret;
389 }
390
391 static int action_executor_snapshot_session_handler(struct action_executor *executor,
392 const struct action_work_item *work_item,
393 const struct lttng_action *action)
394 {
395 int ret = 0;
396 const char *session_name;
397 enum lttng_action_status action_status;
398 struct ltt_session *session;
399 const struct lttng_snapshot_output default_snapshot_output = {
400 .max_size = UINT64_MAX,
401 };
402 const struct lttng_snapshot_output *snapshot_output =
403 &default_snapshot_output;
404 enum lttng_error_code cmd_ret;
405
406 action_status = lttng_action_snapshot_session_get_session_name(
407 action, &session_name);
408 if (action_status != LTTNG_ACTION_STATUS_OK) {
409 ERR("Failed to get session name from `%s` action",
410 get_action_name(action));
411 ret = -1;
412 goto end;
413 }
414
415 action_status = lttng_action_snapshot_session_get_output(
416 action, &snapshot_output);
417 if (action_status != LTTNG_ACTION_STATUS_OK &&
418 action_status != LTTNG_ACTION_STATUS_UNSET) {
419 ERR("Failed to get output from `%s` action",
420 get_action_name(action));
421 ret = -1;
422 goto end;
423 }
424
425 session_lock_list();
426 session = session_find_by_name(session_name);
427 if (!session) {
428 DBG("Failed to find session `%s` by name while executing `%s` action of trigger `%p`",
429 session_name, get_action_name(action),
430 work_item->trigger);
431 goto error_unlock_list;
432 }
433
434
435 session_lock(session);
436 if (!is_trigger_allowed_for_session(work_item->trigger, session)) {
437 goto error_dispose_session;
438 }
439
440 cmd_ret = cmd_snapshot_record(session, snapshot_output, 0);
441 switch (cmd_ret) {
442 case LTTNG_OK:
443 DBG("Successfully recorded snapshot of session `%s` on behalf of trigger `%s`",
444 session_name, get_trigger_name(work_item->trigger));
445 break;
446 default:
447 WARN("Failed to record snapshot of session `%s` on behalf of trigger `%s`: %s",
448 session_name, get_trigger_name(work_item->trigger),
449 lttng_strerror(-cmd_ret));
450 break;
451 }
452
453 error_dispose_session:
454 session_unlock(session);
455 session_put(session);
456 error_unlock_list:
457 session_unlock_list();
458 end:
459 return ret;
460 }
461
462 static int action_executor_group_handler(struct action_executor *executor,
463 const struct action_work_item *work_item,
464 const struct lttng_action *action_group)
465 {
466 int ret = 0;
467 unsigned int i, count;
468 enum lttng_action_status action_status;
469
470 action_status = lttng_action_group_get_count(action_group, &count);
471 if (action_status != LTTNG_ACTION_STATUS_OK) {
472 /* Fatal error. */
473 ERR("Failed to get count of action in action group");
474 ret = -1;
475 goto end;
476 }
477
478 DBG("Action group has %u action%s", count, count != 1 ? "s" : "");
479 for (i = 0; i < count; i++) {
480 const struct lttng_action *action =
481 lttng_action_group_get_at_index(
482 action_group, i);
483
484 ret = action_executor_generic_handler(
485 executor, work_item, action);
486 if (ret) {
487 ERR("Stopping the execution of the action group of trigger `%s` following a fatal error",
488 get_trigger_name(work_item->trigger));
489 goto end;
490 }
491 }
492 end:
493 return ret;
494 }
495
496 static int action_executor_generic_handler(struct action_executor *executor,
497 const struct action_work_item *work_item,
498 const struct lttng_action *action)
499 {
500 const enum lttng_action_type action_type = lttng_action_get_type(action);
501
502 assert(action_type != LTTNG_ACTION_TYPE_UNKNOWN);
503
504 DBG("Executing action `%s` of trigger `%p` action work item %" PRIu64,
505 get_action_name(action),
506 get_trigger_name(work_item->trigger),
507 work_item->id);
508
509 return action_executors[action_type](
510 executor, work_item, action);
511 }
512
513 static int action_work_item_execute(struct action_executor *executor,
514 struct action_work_item *work_item)
515 {
516 int ret;
517 const struct lttng_action *action =
518 lttng_trigger_get_const_action(work_item->trigger);
519
520 DBG("Starting execution of action work item %" PRIu64 " of trigger `%s`",
521 work_item->id, get_trigger_name(work_item->trigger));
522 ret = action_executor_generic_handler(executor, work_item, action);
523 DBG("Completed execution of action work item %" PRIu64 " of trigger `%s`",
524 work_item->id, get_trigger_name(work_item->trigger));
525 return ret;
526 }
527
528 static void action_work_item_destroy(struct action_work_item *work_item)
529 {
530 lttng_trigger_put(work_item->trigger);
531 lttng_evaluation_destroy(work_item->evaluation);
532 notification_client_list_put(work_item->client_list);
533 free(work_item);
534 }
535
536 static void *action_executor_thread(void *_data)
537 {
538 struct action_executor *executor = _data;
539
540 assert(executor);
541
542 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_ACTION_EXECUTOR);
543
544 rcu_register_thread();
545 rcu_thread_online();
546
547 DBG("Entering work execution loop");
548 pthread_mutex_lock(&executor->work.lock);
549 while (!executor->should_quit) {
550 int ret;
551 struct action_work_item *work_item;
552
553 health_code_update();
554 if (executor->work.pending_count == 0) {
555 health_poll_entry();
556 DBG("No work items enqueued, entering wait");
557 pthread_cond_wait(&executor->work.cond,
558 &executor->work.lock);
559 DBG("Woke-up from wait");
560 health_poll_exit();
561 continue;
562 }
563
564 /* Pop item from front of the list with work lock held. */
565 work_item = cds_list_first_entry(&executor->work.list,
566 struct action_work_item, list_node);
567 cds_list_del(&work_item->list_node);
568 executor->work.pending_count--;
569
570 /*
571 * Work can be performed without holding the work lock,
572 * allowing new items to be queued.
573 */
574 pthread_mutex_unlock(&executor->work.lock);
575 ret = action_work_item_execute(executor, work_item);
576 action_work_item_destroy(work_item);
577 if (ret) {
578 /* Fatal error. */
579 break;
580 }
581
582 health_code_update();
583 pthread_mutex_lock(&executor->work.lock);
584 }
585
586 if (executor->should_quit) {
587 pthread_mutex_unlock(&executor->work.lock);
588 }
589 DBG("Left work execution loop");
590
591 health_code_update();
592
593 rcu_thread_offline();
594 rcu_unregister_thread();
595 health_unregister(health_sessiond);
596
597 return NULL;
598 }
599
600 static bool shutdown_action_executor_thread(void *_data)
601 {
602 struct action_executor *executor = _data;
603
604 pthread_mutex_lock(&executor->work.lock);
605 executor->should_quit = true;
606 pthread_cond_signal(&executor->work.cond);
607 pthread_mutex_unlock(&executor->work.lock);
608 return true;
609 }
610
611 static void clean_up_action_executor_thread(void *_data)
612 {
613 struct action_executor *executor = _data;
614
615 assert(cds_list_empty(&executor->work.list));
616
617 pthread_mutex_destroy(&executor->work.lock);
618 pthread_cond_destroy(&executor->work.cond);
619 free(executor);
620 }
621
622 struct action_executor *action_executor_create(
623 struct notification_thread_handle *handle)
624 {
625 struct action_executor *executor = zmalloc(sizeof(*executor));
626
627 if (!executor) {
628 goto end;
629 }
630
631 CDS_INIT_LIST_HEAD(&executor->work.list);
632 pthread_cond_init(&executor->work.cond, NULL);
633 pthread_mutex_init(&executor->work.lock, NULL);
634 executor->notification_thread_handle = handle;
635
636 executor->thread = lttng_thread_create(THREAD_NAME,
637 action_executor_thread, shutdown_action_executor_thread,
638 clean_up_action_executor_thread, executor);
639 end:
640 return executor;
641 }
642
643 void action_executor_destroy(struct action_executor *executor)
644 {
645 struct action_work_item *work_item, *tmp;
646
647 /* TODO Wait for work list to drain? */
648 lttng_thread_shutdown(executor->thread);
649 pthread_mutex_lock(&executor->work.lock);
650 if (executor->work.pending_count != 0) {
651 WARN("%" PRIu64
652 " trigger action%s still queued for execution and will be discarded",
653 executor->work.pending_count,
654 executor->work.pending_count == 1 ? " is" :
655 "s are");
656 }
657
658 cds_list_for_each_entry_safe (
659 work_item, tmp, &executor->work.list, list_node) {
660 WARN("Discarding action work item %" PRIu64
661 " associated to trigger `%s`",
662 work_item->id, get_trigger_name(work_item->trigger));
663 cds_list_del(&work_item->list_node);
664 action_work_item_destroy(work_item);
665 }
666 pthread_mutex_unlock(&executor->work.lock);
667 lttng_thread_put(executor->thread);
668 }
669
670 /* RCU read-lock must be held by the caller. */
671 enum action_executor_status action_executor_enqueue(
672 struct action_executor *executor,
673 struct lttng_trigger *trigger,
674 struct lttng_evaluation *evaluation,
675 const struct lttng_credentials *object_creds,
676 struct notification_client_list *client_list)
677 {
678 enum action_executor_status executor_status = ACTION_EXECUTOR_STATUS_OK;
679 const uint64_t work_item_id = executor->next_work_item_id++;
680 struct action_work_item *work_item;
681 bool signal = false;
682
683 pthread_mutex_lock(&executor->work.lock);
684 /* Check for queue overflow. */
685 if (executor->work.pending_count >= MAX_QUEUED_WORK_COUNT) {
686 /* Most likely spammy, remove if it is the case. */
687 DBG("Refusing to enqueue action for trigger `%s` as work item %" PRIu64
688 " (overflow)", get_trigger_name(trigger), work_item_id);
689 executor_status = ACTION_EXECUTOR_STATUS_OVERFLOW;
690 goto error_unlock;
691 }
692
693 work_item = zmalloc(sizeof(*work_item));
694 if (!work_item) {
695 PERROR("Failed to allocate action executor work item on behalf of trigger `%p`",
696 get_trigger_name(trigger));
697 executor_status = ACTION_EXECUTOR_STATUS_ERROR;
698 goto error_unlock;
699 }
700
701 lttng_trigger_get(trigger);
702 if (client_list) {
703 const bool reference_acquired =
704 notification_client_list_get(client_list);
705
706 assert(reference_acquired);
707 }
708
709 *work_item = (typeof(*work_item)){
710 .id = work_item_id,
711 .trigger = trigger,
712 /* Ownership transferred to the work item. */
713 .evaluation = evaluation,
714 .object_creds = {
715 .is_set = !!object_creds,
716 .value = object_creds ? *object_creds :
717 (typeof(work_item->object_creds.value)) {},
718 },
719 .client_list = client_list,
720 .list_node = CDS_LIST_HEAD_INIT(work_item->list_node),
721 };
722
723 evaluation = NULL;
724 cds_list_add_tail(&work_item->list_node, &executor->work.list);
725 executor->work.pending_count++;
726 DBG("Enqueued action for trigger `%p` as work item %" PRIu64,
727 get_trigger_name(trigger), work_item_id);
728 signal = true;
729
730 error_unlock:
731 if (signal) {
732 pthread_cond_signal(&executor->work.cond);
733 }
734 pthread_mutex_unlock(&executor->work.lock);
735
736 lttng_evaluation_destroy(evaluation);
737 return executor_status;
738 }
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