Remove ht-cleanup thread
[lttng-tools.git] / src / bin / lttng-sessiond / notification-thread.cpp
1 /*
2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #define _LGPL_SOURCE
9 #include <lttng/trigger/trigger.h>
10 #include <lttng/notification/channel-internal.h>
11 #include <lttng/notification/notification-internal.h>
12 #include <lttng/condition/condition-internal.h>
13 #include <lttng/condition/buffer-usage-internal.h>
14 #include <common/error.h>
15 #include <common/config/session-config.h>
16 #include <common/defaults.h>
17 #include <common/utils.h>
18 #include <common/align.h>
19 #include <common/time.h>
20 #include <sys/stat.h>
21 #include <time.h>
22 #include <signal.h>
23
24 #include "notification-thread.h"
25 #include "notification-thread-events.h"
26 #include "notification-thread-commands.h"
27 #include "lttng-sessiond.h"
28 #include "health-sessiond.h"
29 #include "thread.h"
30 #include "testpoint.h"
31
32 #include "kernel.h"
33 #include <common/kernel-ctl/kernel-ctl.h>
34
35 #include <urcu.h>
36 #include <urcu/list.h>
37 #include <urcu/rculfhash.h>
38
39 /*
40 * Flag used to temporarily pause data consumption from testpoints.
41 *
42 * This variable is dlsym-ed from a test, so needs to be exported.
43 */
44 LTTNG_EXPORT int notifier_consumption_paused;
45
46 /*
47 * Destroy the thread data previously created by the init function.
48 */
49 void notification_thread_handle_destroy(
50 struct notification_thread_handle *handle)
51 {
52 int ret;
53
54 if (!handle) {
55 goto end;
56 }
57
58 LTTNG_ASSERT(cds_list_empty(&handle->cmd_queue.list));
59 pthread_mutex_destroy(&handle->cmd_queue.lock);
60 sem_destroy(&handle->ready);
61
62 if (handle->cmd_queue.event_pipe) {
63 lttng_pipe_destroy(handle->cmd_queue.event_pipe);
64 }
65 if (handle->channel_monitoring_pipes.ust32_consumer >= 0) {
66 ret = close(handle->channel_monitoring_pipes.ust32_consumer);
67 if (ret) {
68 PERROR("close 32-bit consumer channel monitoring pipe");
69 }
70 }
71 if (handle->channel_monitoring_pipes.ust64_consumer >= 0) {
72 ret = close(handle->channel_monitoring_pipes.ust64_consumer);
73 if (ret) {
74 PERROR("close 64-bit consumer channel monitoring pipe");
75 }
76 }
77 if (handle->channel_monitoring_pipes.kernel_consumer >= 0) {
78 ret = close(handle->channel_monitoring_pipes.kernel_consumer);
79 if (ret) {
80 PERROR("close kernel consumer channel monitoring pipe");
81 }
82 }
83
84 end:
85 free(handle);
86 }
87
88 struct notification_thread_handle *notification_thread_handle_create(
89 struct lttng_pipe *ust32_channel_monitor_pipe,
90 struct lttng_pipe *ust64_channel_monitor_pipe,
91 struct lttng_pipe *kernel_channel_monitor_pipe)
92 {
93 int ret;
94 struct notification_thread_handle *handle;
95 struct lttng_pipe *event_pipe = NULL;
96
97 handle = (notification_thread_handle *) zmalloc(sizeof(*handle));
98 if (!handle) {
99 goto end;
100 }
101
102 sem_init(&handle->ready, 0, 0);
103
104 event_pipe = lttng_pipe_open(FD_CLOEXEC);
105 if (!event_pipe) {
106 ERR("event_pipe creation");
107 goto error;
108 }
109
110 handle->cmd_queue.event_pipe = event_pipe;
111 event_pipe = NULL;
112
113 CDS_INIT_LIST_HEAD(&handle->cmd_queue.list);
114 ret = pthread_mutex_init(&handle->cmd_queue.lock, NULL);
115 if (ret) {
116 goto error;
117 }
118
119 if (ust32_channel_monitor_pipe) {
120 handle->channel_monitoring_pipes.ust32_consumer =
121 lttng_pipe_release_readfd(
122 ust32_channel_monitor_pipe);
123 if (handle->channel_monitoring_pipes.ust32_consumer < 0) {
124 goto error;
125 }
126 } else {
127 handle->channel_monitoring_pipes.ust32_consumer = -1;
128 }
129 if (ust64_channel_monitor_pipe) {
130 handle->channel_monitoring_pipes.ust64_consumer =
131 lttng_pipe_release_readfd(
132 ust64_channel_monitor_pipe);
133 if (handle->channel_monitoring_pipes.ust64_consumer < 0) {
134 goto error;
135 }
136 } else {
137 handle->channel_monitoring_pipes.ust64_consumer = -1;
138 }
139 if (kernel_channel_monitor_pipe) {
140 handle->channel_monitoring_pipes.kernel_consumer =
141 lttng_pipe_release_readfd(
142 kernel_channel_monitor_pipe);
143 if (handle->channel_monitoring_pipes.kernel_consumer < 0) {
144 goto error;
145 }
146 } else {
147 handle->channel_monitoring_pipes.kernel_consumer = -1;
148 }
149
150 end:
151 return handle;
152 error:
153 lttng_pipe_destroy(event_pipe);
154 notification_thread_handle_destroy(handle);
155 return NULL;
156 }
157
158 static
159 char *get_notification_channel_sock_path(void)
160 {
161 int ret;
162 bool is_root = !getuid();
163 char *sock_path;
164
165 sock_path = (char *) zmalloc(LTTNG_PATH_MAX);
166 if (!sock_path) {
167 goto error;
168 }
169
170 if (is_root) {
171 ret = snprintf(sock_path, LTTNG_PATH_MAX,
172 DEFAULT_GLOBAL_NOTIFICATION_CHANNEL_UNIX_SOCK);
173 if (ret < 0) {
174 goto error;
175 }
176 } else {
177 const char *home_path = utils_get_home_dir();
178
179 if (!home_path) {
180 ERR("Can't get HOME directory for socket creation");
181 goto error;
182 }
183
184 ret = snprintf(sock_path, LTTNG_PATH_MAX,
185 DEFAULT_HOME_NOTIFICATION_CHANNEL_UNIX_SOCK,
186 home_path);
187 if (ret < 0) {
188 goto error;
189 }
190 }
191
192 return sock_path;
193 error:
194 free(sock_path);
195 return NULL;
196 }
197
198 static
199 void notification_channel_socket_destroy(int fd)
200 {
201 int ret;
202 char *sock_path = get_notification_channel_sock_path();
203
204 DBG("Destroying notification channel socket");
205
206 if (sock_path) {
207 ret = unlink(sock_path);
208 free(sock_path);
209 if (ret < 0) {
210 PERROR("unlink notification channel socket");
211 }
212 }
213
214 ret = close(fd);
215 if (ret) {
216 PERROR("close notification channel socket");
217 }
218 }
219
220 static
221 int notification_channel_socket_create(void)
222 {
223 int fd = -1, ret;
224 char *sock_path = get_notification_channel_sock_path();
225
226 DBG("Creating notification channel UNIX socket at %s",
227 sock_path);
228
229 ret = lttcomm_create_unix_sock(sock_path);
230 if (ret < 0) {
231 ERR("Failed to create notification socket");
232 goto error;
233 }
234 fd = ret;
235
236 ret = chmod(sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
237 if (ret < 0) {
238 ERR("Set file permissions failed: %s", sock_path);
239 PERROR("chmod notification channel socket");
240 goto error;
241 }
242
243 if (getuid() == 0) {
244 gid_t gid;
245
246 ret = utils_get_group_id(the_config.tracing_group_name.value,
247 true, &gid);
248 if (ret) {
249 /* Default to root group. */
250 gid = 0;
251 }
252
253 ret = chown(sock_path, 0, gid);
254 if (ret) {
255 ERR("Failed to set the notification channel socket's group");
256 ret = -1;
257 goto error;
258 }
259 }
260
261 DBG("Notification channel UNIX socket created (fd = %i)",
262 fd);
263 free(sock_path);
264 return fd;
265 error:
266 if (fd >= 0 && close(fd) < 0) {
267 PERROR("close notification channel socket");
268 }
269 free(sock_path);
270 return ret;
271 }
272
273 static
274 int init_poll_set(struct lttng_poll_event *poll_set,
275 struct notification_thread_handle *handle,
276 int notification_channel_socket)
277 {
278 int ret;
279
280 /*
281 * Create pollset with size 5:
282 * - notification channel socket (listen for new connections),
283 * - command queue event fd (internal sessiond commands),
284 * - consumerd (32-bit user space) channel monitor pipe,
285 * - consumerd (64-bit user space) channel monitor pipe,
286 * - consumerd (kernel) channel monitor pipe.
287 */
288 ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC);
289 if (ret < 0) {
290 goto end;
291 }
292
293 ret = lttng_poll_add(poll_set, notification_channel_socket,
294 LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP);
295 if (ret < 0) {
296 ERR("Failed to add notification channel socket to pollset");
297 goto error;
298 }
299 ret = lttng_poll_add(poll_set, lttng_pipe_get_readfd(handle->cmd_queue.event_pipe),
300 LPOLLIN | LPOLLERR);
301 if (ret < 0) {
302 ERR("Failed to add notification command queue event fd to pollset");
303 goto error;
304 }
305 ret = lttng_poll_add(poll_set,
306 handle->channel_monitoring_pipes.ust32_consumer,
307 LPOLLIN | LPOLLERR);
308 if (ret < 0) {
309 ERR("Failed to add ust-32 channel monitoring pipe fd to pollset");
310 goto error;
311 }
312 ret = lttng_poll_add(poll_set,
313 handle->channel_monitoring_pipes.ust64_consumer,
314 LPOLLIN | LPOLLERR);
315 if (ret < 0) {
316 ERR("Failed to add ust-64 channel monitoring pipe fd to pollset");
317 goto error;
318 }
319 if (handle->channel_monitoring_pipes.kernel_consumer < 0) {
320 goto end;
321 }
322 ret = lttng_poll_add(poll_set,
323 handle->channel_monitoring_pipes.kernel_consumer,
324 LPOLLIN | LPOLLERR);
325 if (ret < 0) {
326 ERR("Failed to add kernel channel monitoring pipe fd to pollset");
327 goto error;
328 }
329 end:
330 return ret;
331 error:
332 lttng_poll_clean(poll_set);
333 return ret;
334 }
335
336 static
337 void fini_thread_state(struct notification_thread_state *state)
338 {
339 int ret;
340
341 if (state->client_socket_ht) {
342 ret = handle_notification_thread_client_disconnect_all(state);
343 LTTNG_ASSERT(!ret);
344 ret = cds_lfht_destroy(state->client_socket_ht, NULL);
345 LTTNG_ASSERT(!ret);
346 }
347 if (state->client_id_ht) {
348 ret = cds_lfht_destroy(state->client_id_ht, NULL);
349 LTTNG_ASSERT(!ret);
350 }
351 if (state->triggers_ht) {
352 ret = handle_notification_thread_trigger_unregister_all(state);
353 LTTNG_ASSERT(!ret);
354 ret = cds_lfht_destroy(state->triggers_ht, NULL);
355 LTTNG_ASSERT(!ret);
356 }
357 if (state->channel_triggers_ht) {
358 ret = cds_lfht_destroy(state->channel_triggers_ht, NULL);
359 LTTNG_ASSERT(!ret);
360 }
361 if (state->channel_state_ht) {
362 ret = cds_lfht_destroy(state->channel_state_ht, NULL);
363 LTTNG_ASSERT(!ret);
364 }
365 if (state->notification_trigger_clients_ht) {
366 ret = cds_lfht_destroy(state->notification_trigger_clients_ht,
367 NULL);
368 LTTNG_ASSERT(!ret);
369 }
370 if (state->channels_ht) {
371 ret = cds_lfht_destroy(state->channels_ht, NULL);
372 LTTNG_ASSERT(!ret);
373 }
374 if (state->sessions_ht) {
375 ret = cds_lfht_destroy(state->sessions_ht, NULL);
376 LTTNG_ASSERT(!ret);
377 }
378 if (state->triggers_by_name_uid_ht) {
379 ret = cds_lfht_destroy(state->triggers_by_name_uid_ht, NULL);
380 LTTNG_ASSERT(!ret);
381 }
382 if (state->trigger_tokens_ht) {
383 ret = cds_lfht_destroy(state->trigger_tokens_ht, NULL);
384 LTTNG_ASSERT(!ret);
385 }
386 /*
387 * Must be destroyed after all channels have been destroyed.
388 * See comment in struct lttng_session_trigger_list.
389 */
390 if (state->session_triggers_ht) {
391 ret = cds_lfht_destroy(state->session_triggers_ht, NULL);
392 LTTNG_ASSERT(!ret);
393 }
394 if (state->notification_channel_socket >= 0) {
395 notification_channel_socket_destroy(
396 state->notification_channel_socket);
397 }
398
399 LTTNG_ASSERT(cds_list_empty(&state->tracer_event_sources_list));
400
401 if (state->executor) {
402 action_executor_destroy(state->executor);
403 }
404 lttng_poll_clean(&state->events);
405 }
406
407 static
408 void mark_thread_as_ready(struct notification_thread_handle *handle)
409 {
410 DBG("Marking notification thread as ready");
411 sem_post(&handle->ready);
412 }
413
414 static
415 void wait_until_thread_is_ready(struct notification_thread_handle *handle)
416 {
417 DBG("Waiting for notification thread to be ready");
418 sem_wait(&handle->ready);
419 DBG("Notification thread is ready");
420 }
421
422 static
423 int init_thread_state(struct notification_thread_handle *handle,
424 struct notification_thread_state *state)
425 {
426 int ret;
427
428 memset(state, 0, sizeof(*state));
429 state->notification_channel_socket = -1;
430 state->trigger_id.next_tracer_token = 1;
431 lttng_poll_init(&state->events);
432
433 ret = notification_channel_socket_create();
434 if (ret < 0) {
435 goto end;
436 }
437 state->notification_channel_socket = ret;
438
439 ret = init_poll_set(&state->events, handle,
440 state->notification_channel_socket);
441 if (ret) {
442 goto end;
443 }
444
445 DBG("Listening on notification channel socket");
446 ret = lttcomm_listen_unix_sock(state->notification_channel_socket);
447 if (ret < 0) {
448 ERR("Listen failed on notification channel socket");
449 goto error;
450 }
451
452 state->client_socket_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
453 CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
454 if (!state->client_socket_ht) {
455 goto error;
456 }
457
458 state->client_id_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
459 CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
460 if (!state->client_id_ht) {
461 goto error;
462 }
463
464 state->channel_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
465 CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
466 if (!state->channel_triggers_ht) {
467 goto error;
468 }
469
470 state->session_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
471 CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
472 if (!state->session_triggers_ht) {
473 goto error;
474 }
475
476 state->channel_state_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
477 CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
478 if (!state->channel_state_ht) {
479 goto error;
480 }
481
482 state->notification_trigger_clients_ht = cds_lfht_new(DEFAULT_HT_SIZE,
483 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
484 if (!state->notification_trigger_clients_ht) {
485 goto error;
486 }
487
488 state->channels_ht = cds_lfht_new(DEFAULT_HT_SIZE,
489 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
490 if (!state->channels_ht) {
491 goto error;
492 }
493 state->sessions_ht = cds_lfht_new(DEFAULT_HT_SIZE,
494 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
495 if (!state->sessions_ht) {
496 goto error;
497 }
498 state->triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE,
499 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
500 if (!state->triggers_ht) {
501 goto error;
502 }
503 state->triggers_by_name_uid_ht = cds_lfht_new(DEFAULT_HT_SIZE,
504 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
505 if (!state->triggers_by_name_uid_ht) {
506 goto error;
507 }
508
509 state->trigger_tokens_ht = cds_lfht_new(DEFAULT_HT_SIZE,
510 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
511 if (!state->trigger_tokens_ht) {
512 goto error;
513 }
514
515 CDS_INIT_LIST_HEAD(&state->tracer_event_sources_list);
516
517 state->executor = action_executor_create(handle);
518 if (!state->executor) {
519 goto error;
520 }
521
522 state->restart_poll = false;
523
524 mark_thread_as_ready(handle);
525 end:
526 return 0;
527 error:
528 fini_thread_state(state);
529 return -1;
530 }
531
532 static
533 int handle_channel_monitoring_pipe(int fd, uint32_t revents,
534 struct notification_thread_handle *handle,
535 struct notification_thread_state *state)
536 {
537 int ret = 0;
538 enum lttng_domain_type domain;
539
540 if (fd == handle->channel_monitoring_pipes.ust32_consumer ||
541 fd == handle->channel_monitoring_pipes.ust64_consumer) {
542 domain = LTTNG_DOMAIN_UST;
543 } else if (fd == handle->channel_monitoring_pipes.kernel_consumer) {
544 domain = LTTNG_DOMAIN_KERNEL;
545 } else {
546 abort();
547 }
548
549 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
550 ret = lttng_poll_del(&state->events, fd);
551 if (ret) {
552 ERR("Failed to remove consumer monitoring pipe from poll set");
553 }
554 goto end;
555 }
556
557 ret = handle_notification_thread_channel_sample(
558 state, fd, domain);
559 if (ret) {
560 ERR("Consumer sample handling error occurred");
561 ret = -1;
562 goto end;
563 }
564 end:
565 return ret;
566 }
567
568 static int handle_event_notification_pipe(int event_source_fd,
569 enum lttng_domain_type domain,
570 uint32_t revents,
571 struct notification_thread_state *state)
572 {
573 int ret = 0;
574
575 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
576 ret = handle_notification_thread_tracer_event_source_died(
577 state, event_source_fd);
578 if (ret) {
579 ERR("Failed to remove event notification pipe from poll set: fd = %d",
580 event_source_fd);
581 }
582 goto end;
583 }
584
585 if (testpoint(sessiond_handle_notifier_event_pipe)) {
586 ret = 0;
587 goto end;
588 }
589
590 if (caa_unlikely(notifier_consumption_paused)) {
591 DBG("Event notifier notification consumption paused, sleeping...");
592 sleep(1);
593 goto end;
594 }
595
596 ret = handle_notification_thread_event_notification(
597 state, event_source_fd, domain);
598 if (ret) {
599 ERR("Event notification handling error occurred for fd: %d",
600 event_source_fd);
601 ret = -1;
602 goto end;
603 }
604
605 end:
606 return ret;
607 }
608
609 /*
610 * Return the event source domain type via parameter.
611 */
612 static bool fd_is_event_notification_source(const struct notification_thread_state *state,
613 int fd,
614 enum lttng_domain_type *domain)
615 {
616 struct notification_event_tracer_event_source_element *source_element;
617
618 LTTNG_ASSERT(domain);
619
620 cds_list_for_each_entry(source_element,
621 &state->tracer_event_sources_list, node) {
622 if (source_element->fd != fd) {
623 continue;
624 }
625
626 *domain = source_element->domain;
627 return true;
628 }
629
630 return false;
631 }
632
633 /*
634 * This thread services notification channel clients and commands received
635 * from various lttng-sessiond components over a command queue.
636 */
637 static
638 void *thread_notification(void *data)
639 {
640 int ret;
641 struct notification_thread_handle *handle = (notification_thread_handle *) data;
642 struct notification_thread_state state;
643 enum lttng_domain_type domain;
644
645 DBG("Started notification thread");
646
647 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_NOTIFICATION);
648 rcu_register_thread();
649 rcu_thread_online();
650
651 if (!handle) {
652 ERR("Invalid thread context provided");
653 goto end;
654 }
655
656 health_code_update();
657
658 ret = init_thread_state(handle, &state);
659 if (ret) {
660 goto end;
661 }
662
663 if (testpoint(sessiond_thread_notification)) {
664 goto end;
665 }
666
667 while (true) {
668 int fd_count, i;
669
670 health_poll_entry();
671 DBG("Entering poll wait");
672 ret = lttng_poll_wait(&state.events, -1);
673 DBG("Poll wait returned (%i)", ret);
674 health_poll_exit();
675 if (ret < 0) {
676 /*
677 * Restart interrupted system call.
678 */
679 if (errno == EINTR) {
680 continue;
681 }
682 ERR("Error encountered during lttng_poll_wait (%i)", ret);
683 goto error;
684 }
685
686 /*
687 * Reset restart_poll flag so that calls below might turn it
688 * on.
689 */
690 state.restart_poll = false;
691
692 fd_count = ret;
693 for (i = 0; i < fd_count; i++) {
694 int fd = LTTNG_POLL_GETFD(&state.events, i);
695 uint32_t revents = LTTNG_POLL_GETEV(&state.events, i);
696
697 DBG("Handling fd (%i) activity (%u)", fd, revents);
698
699 if (fd == state.notification_channel_socket) {
700 if (revents & LPOLLIN) {
701 ret = handle_notification_thread_client_connect(
702 &state);
703 if (ret < 0) {
704 goto error;
705 }
706 } else if (revents &
707 (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
708 ERR("Notification socket poll error");
709 goto error;
710 } else {
711 ERR("Unexpected poll events %u for notification socket %i", revents, fd);
712 goto error;
713 }
714 } else if (fd == lttng_pipe_get_readfd(handle->cmd_queue.event_pipe)) {
715 ret = handle_notification_thread_command(handle,
716 &state);
717 if (ret < 0) {
718 DBG("Error encountered while servicing command queue");
719 goto error;
720 } else if (ret > 0) {
721 goto exit;
722 }
723 } else if (fd == handle->channel_monitoring_pipes.ust32_consumer ||
724 fd == handle->channel_monitoring_pipes.ust64_consumer ||
725 fd == handle->channel_monitoring_pipes.kernel_consumer) {
726 ret = handle_channel_monitoring_pipe(fd,
727 revents, handle, &state);
728 if (ret) {
729 goto error;
730 }
731 } else if (fd_is_event_notification_source(&state, fd, &domain)) {
732 ret = handle_event_notification_pipe(fd, domain, revents, &state);
733 if (ret) {
734 goto error;
735 }
736 } else {
737 /* Activity on a client's socket. */
738 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
739 /*
740 * It doesn't matter if a command was
741 * pending on the client socket at this
742 * point since it now has no way to
743 * receive the notifications to which
744 * it was subscribing or unsubscribing.
745 */
746 ret = handle_notification_thread_client_disconnect(
747 fd, &state);
748 if (ret) {
749 goto error;
750 }
751 } else {
752 if (revents & LPOLLIN) {
753 ret = handle_notification_thread_client_in(
754 &state, fd);
755 if (ret) {
756 goto error;
757 }
758 }
759
760 if (revents & LPOLLOUT) {
761 ret = handle_notification_thread_client_out(
762 &state, fd);
763 if (ret) {
764 goto error;
765 }
766 }
767 }
768 }
769
770 /*
771 * Calls above might have changed the state of the
772 * FDs in `state.events`. Call _poll_wait() again to
773 * ensure we have a consistent state.
774 */
775 if (state.restart_poll) {
776 break;
777 }
778 }
779 }
780 exit:
781 error:
782 fini_thread_state(&state);
783 end:
784 rcu_thread_offline();
785 rcu_unregister_thread();
786 health_unregister(the_health_sessiond);
787 return NULL;
788 }
789
790 static
791 bool shutdown_notification_thread(void *thread_data)
792 {
793 struct notification_thread_handle *handle = (notification_thread_handle *) thread_data;
794
795 notification_thread_command_quit(handle);
796 return true;
797 }
798
799 struct lttng_thread *launch_notification_thread(
800 struct notification_thread_handle *handle)
801 {
802 struct lttng_thread *thread;
803
804 thread = lttng_thread_create("Notification",
805 thread_notification,
806 shutdown_notification_thread,
807 NULL,
808 handle);
809 if (!thread) {
810 goto error;
811 }
812
813 /*
814 * Wait for the thread to be marked as "ready" before returning
815 * as other subsystems depend on the notification subsystem
816 * (e.g. rotation thread).
817 */
818 wait_until_thread_is_ready(handle);
819 return thread;
820 error:
821 return NULL;
822 }
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