Commit | Line | Data |
---|---|---|
ab0ee2ca | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
ab0ee2ca | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
ab0ee2ca | 5 | * |
ab0ee2ca JG |
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> | |
ab0ee2ca JG |
18 | #include <common/align.h> |
19 | #include <common/time.h> | |
20 | #include <sys/eventfd.h> | |
21 | #include <sys/stat.h> | |
22 | #include <time.h> | |
23 | #include <signal.h> | |
24 | ||
25 | #include "notification-thread.h" | |
26 | #include "notification-thread-events.h" | |
27 | #include "notification-thread-commands.h" | |
28 | #include "lttng-sessiond.h" | |
29 | #include "health-sessiond.h" | |
c8a9de5a | 30 | #include "thread.h" |
ab0ee2ca JG |
31 | |
32 | #include <urcu.h> | |
33 | #include <urcu/list.h> | |
34 | #include <urcu/rculfhash.h> | |
35 | ||
ab0ee2ca JG |
36 | /* |
37 | * Destroy the thread data previously created by the init function. | |
38 | */ | |
39 | void notification_thread_handle_destroy( | |
40 | struct notification_thread_handle *handle) | |
41 | { | |
42 | int ret; | |
ab0ee2ca JG |
43 | |
44 | if (!handle) { | |
45 | goto end; | |
46 | } | |
47 | ||
8ada111f | 48 | assert(cds_list_empty(&handle->cmd_queue.list)); |
ab0ee2ca | 49 | pthread_mutex_destroy(&handle->cmd_queue.lock); |
c8a9de5a | 50 | sem_destroy(&handle->ready); |
ab0ee2ca | 51 | |
814b4934 JR |
52 | if (handle->cmd_queue.event_pipe) { |
53 | lttng_pipe_destroy(handle->cmd_queue.event_pipe); | |
54 | } | |
ab0ee2ca JG |
55 | if (handle->channel_monitoring_pipes.ust32_consumer >= 0) { |
56 | ret = close(handle->channel_monitoring_pipes.ust32_consumer); | |
57 | if (ret) { | |
58 | PERROR("close 32-bit consumer channel monitoring pipe"); | |
59 | } | |
60 | } | |
61 | if (handle->channel_monitoring_pipes.ust64_consumer >= 0) { | |
62 | ret = close(handle->channel_monitoring_pipes.ust64_consumer); | |
63 | if (ret) { | |
64 | PERROR("close 64-bit consumer channel monitoring pipe"); | |
65 | } | |
66 | } | |
67 | if (handle->channel_monitoring_pipes.kernel_consumer >= 0) { | |
68 | ret = close(handle->channel_monitoring_pipes.kernel_consumer); | |
69 | if (ret) { | |
70 | PERROR("close kernel consumer channel monitoring pipe"); | |
71 | } | |
72 | } | |
73 | end: | |
74 | free(handle); | |
75 | } | |
76 | ||
77 | struct notification_thread_handle *notification_thread_handle_create( | |
78 | struct lttng_pipe *ust32_channel_monitor_pipe, | |
79 | struct lttng_pipe *ust64_channel_monitor_pipe, | |
c8a9de5a | 80 | struct lttng_pipe *kernel_channel_monitor_pipe) |
ab0ee2ca JG |
81 | { |
82 | int ret; | |
83 | struct notification_thread_handle *handle; | |
814b4934 | 84 | struct lttng_pipe *event_pipe = NULL; |
ab0ee2ca JG |
85 | |
86 | handle = zmalloc(sizeof(*handle)); | |
87 | if (!handle) { | |
88 | goto end; | |
89 | } | |
90 | ||
c8a9de5a JG |
91 | sem_init(&handle->ready, 0, 0); |
92 | ||
18d08850 | 93 | event_pipe = lttng_pipe_open(FD_CLOEXEC); |
814b4934 JR |
94 | if (!event_pipe) { |
95 | ERR("event_pipe creation"); | |
ab0ee2ca JG |
96 | goto error; |
97 | } | |
814b4934 JR |
98 | |
99 | handle->cmd_queue.event_pipe = event_pipe; | |
100 | event_pipe = NULL; | |
101 | ||
ab0ee2ca JG |
102 | CDS_INIT_LIST_HEAD(&handle->cmd_queue.list); |
103 | ret = pthread_mutex_init(&handle->cmd_queue.lock, NULL); | |
104 | if (ret) { | |
105 | goto error; | |
106 | } | |
107 | ||
108 | if (ust32_channel_monitor_pipe) { | |
109 | handle->channel_monitoring_pipes.ust32_consumer = | |
110 | lttng_pipe_release_readfd( | |
111 | ust32_channel_monitor_pipe); | |
112 | if (handle->channel_monitoring_pipes.ust32_consumer < 0) { | |
113 | goto error; | |
114 | } | |
115 | } else { | |
116 | handle->channel_monitoring_pipes.ust32_consumer = -1; | |
117 | } | |
118 | if (ust64_channel_monitor_pipe) { | |
119 | handle->channel_monitoring_pipes.ust64_consumer = | |
120 | lttng_pipe_release_readfd( | |
121 | ust64_channel_monitor_pipe); | |
122 | if (handle->channel_monitoring_pipes.ust64_consumer < 0) { | |
123 | goto error; | |
124 | } | |
125 | } else { | |
126 | handle->channel_monitoring_pipes.ust64_consumer = -1; | |
127 | } | |
128 | if (kernel_channel_monitor_pipe) { | |
129 | handle->channel_monitoring_pipes.kernel_consumer = | |
130 | lttng_pipe_release_readfd( | |
131 | kernel_channel_monitor_pipe); | |
132 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { | |
133 | goto error; | |
134 | } | |
135 | } else { | |
136 | handle->channel_monitoring_pipes.kernel_consumer = -1; | |
137 | } | |
138 | end: | |
139 | return handle; | |
140 | error: | |
814b4934 | 141 | lttng_pipe_destroy(event_pipe); |
ab0ee2ca JG |
142 | notification_thread_handle_destroy(handle); |
143 | return NULL; | |
144 | } | |
145 | ||
146 | static | |
147 | char *get_notification_channel_sock_path(void) | |
148 | { | |
149 | int ret; | |
150 | bool is_root = !getuid(); | |
151 | char *sock_path; | |
152 | ||
153 | sock_path = zmalloc(LTTNG_PATH_MAX); | |
154 | if (!sock_path) { | |
155 | goto error; | |
156 | } | |
157 | ||
158 | if (is_root) { | |
159 | ret = snprintf(sock_path, LTTNG_PATH_MAX, | |
160 | DEFAULT_GLOBAL_NOTIFICATION_CHANNEL_UNIX_SOCK); | |
161 | if (ret < 0) { | |
162 | goto error; | |
163 | } | |
164 | } else { | |
4f00620d | 165 | const char *home_path = utils_get_home_dir(); |
ab0ee2ca JG |
166 | |
167 | if (!home_path) { | |
168 | ERR("Can't get HOME directory for socket creation"); | |
169 | goto error; | |
170 | } | |
171 | ||
172 | ret = snprintf(sock_path, LTTNG_PATH_MAX, | |
173 | DEFAULT_HOME_NOTIFICATION_CHANNEL_UNIX_SOCK, | |
174 | home_path); | |
175 | if (ret < 0) { | |
176 | goto error; | |
177 | } | |
178 | } | |
179 | ||
180 | return sock_path; | |
181 | error: | |
182 | free(sock_path); | |
183 | return NULL; | |
184 | } | |
185 | ||
186 | static | |
187 | void notification_channel_socket_destroy(int fd) | |
188 | { | |
189 | int ret; | |
190 | char *sock_path = get_notification_channel_sock_path(); | |
191 | ||
192 | DBG("[notification-thread] Destroying notification channel socket"); | |
193 | ||
194 | if (sock_path) { | |
195 | ret = unlink(sock_path); | |
196 | free(sock_path); | |
197 | if (ret < 0) { | |
198 | PERROR("unlink notification channel socket"); | |
199 | } | |
200 | } | |
201 | ||
202 | ret = close(fd); | |
203 | if (ret) { | |
204 | PERROR("close notification channel socket"); | |
205 | } | |
206 | } | |
207 | ||
208 | static | |
209 | int notification_channel_socket_create(void) | |
210 | { | |
211 | int fd = -1, ret; | |
212 | char *sock_path = get_notification_channel_sock_path(); | |
213 | ||
214 | DBG("[notification-thread] Creating notification channel UNIX socket at %s", | |
215 | sock_path); | |
216 | ||
217 | ret = lttcomm_create_unix_sock(sock_path); | |
218 | if (ret < 0) { | |
219 | ERR("[notification-thread] Failed to create notification socket"); | |
220 | goto error; | |
221 | } | |
222 | fd = ret; | |
223 | ||
224 | ret = chmod(sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
225 | if (ret < 0) { | |
226 | ERR("Set file permissions failed: %s", sock_path); | |
227 | PERROR("chmod notification channel socket"); | |
228 | goto error; | |
229 | } | |
230 | ||
231 | if (getuid() == 0) { | |
28ab59d0 JR |
232 | gid_t gid; |
233 | ||
234 | ret = utils_get_group_id(config.tracing_group_name.value, true, | |
235 | &gid); | |
236 | if (ret) { | |
237 | /* Default to root group. */ | |
238 | gid = 0; | |
239 | } | |
240 | ||
241 | ret = chown(sock_path, 0, gid); | |
ab0ee2ca JG |
242 | if (ret) { |
243 | ERR("Failed to set the notification channel socket's group"); | |
244 | ret = -1; | |
245 | goto error; | |
246 | } | |
247 | } | |
248 | ||
249 | DBG("[notification-thread] Notification channel UNIX socket created (fd = %i)", | |
250 | fd); | |
251 | free(sock_path); | |
252 | return fd; | |
253 | error: | |
254 | if (fd >= 0 && close(fd) < 0) { | |
255 | PERROR("close notification channel socket"); | |
256 | } | |
257 | free(sock_path); | |
258 | return ret; | |
259 | } | |
260 | ||
261 | static | |
262 | int init_poll_set(struct lttng_poll_event *poll_set, | |
263 | struct notification_thread_handle *handle, | |
264 | int notification_channel_socket) | |
265 | { | |
266 | int ret; | |
267 | ||
268 | /* | |
269 | * Create pollset with size 5: | |
270 | * - notification channel socket (listen for new connections), | |
271 | * - command queue event fd (internal sessiond commands), | |
272 | * - consumerd (32-bit user space) channel monitor pipe, | |
273 | * - consumerd (64-bit user space) channel monitor pipe, | |
274 | * - consumerd (kernel) channel monitor pipe. | |
275 | */ | |
276 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); | |
277 | if (ret < 0) { | |
278 | goto end; | |
279 | } | |
280 | ||
281 | ret = lttng_poll_add(poll_set, notification_channel_socket, | |
282 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
283 | if (ret < 0) { | |
284 | ERR("[notification-thread] Failed to add notification channel socket to pollset"); | |
285 | goto error; | |
286 | } | |
814b4934 | 287 | ret = lttng_poll_add(poll_set, lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), |
ab0ee2ca JG |
288 | LPOLLIN | LPOLLERR); |
289 | if (ret < 0) { | |
290 | ERR("[notification-thread] Failed to add notification command queue event fd to pollset"); | |
291 | goto error; | |
292 | } | |
293 | ret = lttng_poll_add(poll_set, | |
294 | handle->channel_monitoring_pipes.ust32_consumer, | |
295 | LPOLLIN | LPOLLERR); | |
296 | if (ret < 0) { | |
297 | ERR("[notification-thread] Failed to add ust-32 channel monitoring pipe fd to pollset"); | |
298 | goto error; | |
299 | } | |
300 | ret = lttng_poll_add(poll_set, | |
301 | handle->channel_monitoring_pipes.ust64_consumer, | |
302 | LPOLLIN | LPOLLERR); | |
303 | if (ret < 0) { | |
304 | ERR("[notification-thread] Failed to add ust-64 channel monitoring pipe fd to pollset"); | |
305 | goto error; | |
306 | } | |
307 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { | |
308 | goto end; | |
309 | } | |
310 | ret = lttng_poll_add(poll_set, | |
311 | handle->channel_monitoring_pipes.kernel_consumer, | |
312 | LPOLLIN | LPOLLERR); | |
313 | if (ret < 0) { | |
314 | ERR("[notification-thread] Failed to add kernel channel monitoring pipe fd to pollset"); | |
315 | goto error; | |
316 | } | |
317 | end: | |
318 | return ret; | |
319 | error: | |
320 | lttng_poll_clean(poll_set); | |
321 | return ret; | |
322 | } | |
323 | ||
324 | static | |
325 | void fini_thread_state(struct notification_thread_state *state) | |
326 | { | |
327 | int ret; | |
328 | ||
329 | if (state->client_socket_ht) { | |
330 | ret = handle_notification_thread_client_disconnect_all(state); | |
331 | assert(!ret); | |
332 | ret = cds_lfht_destroy(state->client_socket_ht, NULL); | |
333 | assert(!ret); | |
334 | } | |
335 | if (state->triggers_ht) { | |
336 | ret = handle_notification_thread_trigger_unregister_all(state); | |
337 | assert(!ret); | |
338 | ret = cds_lfht_destroy(state->triggers_ht, NULL); | |
339 | assert(!ret); | |
340 | } | |
341 | if (state->channel_triggers_ht) { | |
342 | ret = cds_lfht_destroy(state->channel_triggers_ht, NULL); | |
343 | assert(!ret); | |
344 | } | |
345 | if (state->channel_state_ht) { | |
346 | ret = cds_lfht_destroy(state->channel_state_ht, NULL); | |
347 | assert(!ret); | |
348 | } | |
349 | if (state->notification_trigger_clients_ht) { | |
350 | ret = cds_lfht_destroy(state->notification_trigger_clients_ht, | |
351 | NULL); | |
352 | assert(!ret); | |
353 | } | |
354 | if (state->channels_ht) { | |
8abe313a JG |
355 | ret = cds_lfht_destroy(state->channels_ht, NULL); |
356 | assert(!ret); | |
357 | } | |
358 | if (state->sessions_ht) { | |
359 | ret = cds_lfht_destroy(state->sessions_ht, NULL); | |
ab0ee2ca JG |
360 | assert(!ret); |
361 | } | |
ea9a44f0 JG |
362 | /* |
363 | * Must be destroyed after all channels have been destroyed. | |
364 | * See comment in struct lttng_session_trigger_list. | |
365 | */ | |
366 | if (state->session_triggers_ht) { | |
367 | ret = cds_lfht_destroy(state->session_triggers_ht, NULL); | |
368 | assert(!ret); | |
369 | } | |
ab0ee2ca JG |
370 | if (state->notification_channel_socket >= 0) { |
371 | notification_channel_socket_destroy( | |
372 | state->notification_channel_socket); | |
373 | } | |
374 | lttng_poll_clean(&state->events); | |
375 | } | |
376 | ||
c8a9de5a JG |
377 | static |
378 | void mark_thread_as_ready(struct notification_thread_handle *handle) | |
379 | { | |
380 | DBG("Marking notification thread as ready"); | |
381 | sem_post(&handle->ready); | |
382 | } | |
383 | ||
384 | static | |
385 | void wait_until_thread_is_ready(struct notification_thread_handle *handle) | |
386 | { | |
387 | DBG("Waiting for notification thread to be ready"); | |
388 | sem_wait(&handle->ready); | |
389 | DBG("Notification thread is ready"); | |
390 | } | |
391 | ||
ab0ee2ca JG |
392 | static |
393 | int init_thread_state(struct notification_thread_handle *handle, | |
394 | struct notification_thread_state *state) | |
395 | { | |
396 | int ret; | |
397 | ||
398 | memset(state, 0, sizeof(*state)); | |
399 | state->notification_channel_socket = -1; | |
400 | lttng_poll_init(&state->events); | |
401 | ||
402 | ret = notification_channel_socket_create(); | |
403 | if (ret < 0) { | |
404 | goto end; | |
405 | } | |
406 | state->notification_channel_socket = ret; | |
407 | ||
408 | ret = init_poll_set(&state->events, handle, | |
409 | state->notification_channel_socket); | |
410 | if (ret) { | |
411 | goto end; | |
412 | } | |
413 | ||
414 | DBG("[notification-thread] Listening on notification channel socket"); | |
415 | ret = lttcomm_listen_unix_sock(state->notification_channel_socket); | |
416 | if (ret < 0) { | |
417 | ERR("[notification-thread] Listen failed on notification channel socket"); | |
418 | goto error; | |
419 | } | |
420 | ||
421 | state->client_socket_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, | |
422 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
423 | if (!state->client_socket_ht) { | |
424 | goto error; | |
425 | } | |
426 | ||
427 | state->channel_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, | |
428 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
429 | if (!state->channel_triggers_ht) { | |
430 | goto error; | |
431 | } | |
432 | ||
ea9a44f0 JG |
433 | state->session_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
434 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
435 | if (!state->session_triggers_ht) { | |
436 | goto error; | |
437 | } | |
438 | ||
ab0ee2ca JG |
439 | state->channel_state_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
440 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
441 | if (!state->channel_state_ht) { | |
442 | goto error; | |
443 | } | |
444 | ||
445 | state->notification_trigger_clients_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
446 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
447 | if (!state->notification_trigger_clients_ht) { | |
448 | goto error; | |
449 | } | |
450 | ||
451 | state->channels_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
452 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
453 | if (!state->channels_ht) { | |
454 | goto error; | |
455 | } | |
8abe313a JG |
456 | state->sessions_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
457 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
458 | if (!state->sessions_ht) { | |
459 | goto error; | |
460 | } | |
ab0ee2ca JG |
461 | state->triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
462 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
463 | if (!state->triggers_ht) { | |
464 | goto error; | |
465 | } | |
c8a9de5a | 466 | mark_thread_as_ready(handle); |
ab0ee2ca JG |
467 | end: |
468 | return 0; | |
469 | error: | |
470 | fini_thread_state(state); | |
471 | return -1; | |
472 | } | |
473 | ||
474 | static | |
475 | int handle_channel_monitoring_pipe(int fd, uint32_t revents, | |
476 | struct notification_thread_handle *handle, | |
477 | struct notification_thread_state *state) | |
478 | { | |
479 | int ret = 0; | |
480 | enum lttng_domain_type domain; | |
481 | ||
482 | if (fd == handle->channel_monitoring_pipes.ust32_consumer || | |
483 | fd == handle->channel_monitoring_pipes.ust64_consumer) { | |
484 | domain = LTTNG_DOMAIN_UST; | |
485 | } else if (fd == handle->channel_monitoring_pipes.kernel_consumer) { | |
486 | domain = LTTNG_DOMAIN_KERNEL; | |
487 | } else { | |
488 | abort(); | |
489 | } | |
490 | ||
491 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
492 | ret = lttng_poll_del(&state->events, fd); | |
493 | if (ret) { | |
494 | ERR("[notification-thread] Failed to remove consumer monitoring pipe from poll set"); | |
495 | } | |
496 | goto end; | |
497 | } | |
498 | ||
499 | ret = handle_notification_thread_channel_sample( | |
500 | state, fd, domain); | |
501 | if (ret) { | |
4149ace8 | 502 | ERR("[notification-thread] Consumer sample handling error occurred"); |
ab0ee2ca JG |
503 | ret = -1; |
504 | goto end; | |
505 | } | |
506 | end: | |
507 | return ret; | |
508 | } | |
509 | ||
510 | /* | |
511 | * This thread services notification channel clients and commands received | |
512 | * from various lttng-sessiond components over a command queue. | |
513 | */ | |
c8a9de5a | 514 | static |
ab0ee2ca JG |
515 | void *thread_notification(void *data) |
516 | { | |
517 | int ret; | |
518 | struct notification_thread_handle *handle = data; | |
519 | struct notification_thread_state state; | |
520 | ||
521 | DBG("[notification-thread] Started notification thread"); | |
522 | ||
f620cc28 JG |
523 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_NOTIFICATION); |
524 | rcu_register_thread(); | |
525 | rcu_thread_online(); | |
526 | ||
ab0ee2ca JG |
527 | if (!handle) { |
528 | ERR("[notification-thread] Invalid thread context provided"); | |
529 | goto end; | |
530 | } | |
531 | ||
ab0ee2ca JG |
532 | health_code_update(); |
533 | ||
534 | ret = init_thread_state(handle, &state); | |
535 | if (ret) { | |
536 | goto end; | |
537 | } | |
538 | ||
ab0ee2ca JG |
539 | while (true) { |
540 | int fd_count, i; | |
541 | ||
542 | health_poll_entry(); | |
543 | DBG("[notification-thread] Entering poll wait"); | |
544 | ret = lttng_poll_wait(&state.events, -1); | |
545 | DBG("[notification-thread] Poll wait returned (%i)", ret); | |
546 | health_poll_exit(); | |
547 | if (ret < 0) { | |
548 | /* | |
549 | * Restart interrupted system call. | |
550 | */ | |
551 | if (errno == EINTR) { | |
552 | continue; | |
553 | } | |
554 | ERR("[notification-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
555 | goto error; | |
556 | } | |
557 | ||
558 | fd_count = ret; | |
559 | for (i = 0; i < fd_count; i++) { | |
560 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
561 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
562 | ||
563 | DBG("[notification-thread] Handling fd (%i) activity (%u)", fd, revents); | |
564 | ||
565 | if (fd == state.notification_channel_socket) { | |
566 | if (revents & LPOLLIN) { | |
567 | ret = handle_notification_thread_client_connect( | |
568 | &state); | |
569 | if (ret < 0) { | |
570 | goto error; | |
571 | } | |
572 | } else if (revents & | |
573 | (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
574 | ERR("[notification-thread] Notification socket poll error"); | |
575 | goto error; | |
576 | } else { | |
577 | ERR("[notification-thread] Unexpected poll events %u for notification socket %i", revents, fd); | |
578 | goto error; | |
579 | } | |
814b4934 | 580 | } else if (fd == lttng_pipe_get_readfd(handle->cmd_queue.event_pipe)) { |
ab0ee2ca JG |
581 | ret = handle_notification_thread_command(handle, |
582 | &state); | |
583 | if (ret < 0) { | |
584 | DBG("[notification-thread] Error encountered while servicing command queue"); | |
585 | goto error; | |
586 | } else if (ret > 0) { | |
587 | goto exit; | |
588 | } | |
589 | } else if (fd == handle->channel_monitoring_pipes.ust32_consumer || | |
590 | fd == handle->channel_monitoring_pipes.ust64_consumer || | |
591 | fd == handle->channel_monitoring_pipes.kernel_consumer) { | |
592 | ret = handle_channel_monitoring_pipe(fd, | |
593 | revents, handle, &state); | |
594 | if (ret) { | |
595 | goto error; | |
596 | } | |
597 | } else { | |
598 | /* Activity on a client's socket. */ | |
599 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
600 | /* | |
601 | * It doesn't matter if a command was | |
602 | * pending on the client socket at this | |
603 | * point since it now has no way to | |
604 | * receive the notifications to which | |
605 | * it was subscribing or unsubscribing. | |
606 | */ | |
607 | ret = handle_notification_thread_client_disconnect( | |
608 | fd, &state); | |
609 | if (ret) { | |
610 | goto error; | |
611 | } | |
612 | } else { | |
613 | if (revents & LPOLLIN) { | |
614 | ret = handle_notification_thread_client_in( | |
615 | &state, fd); | |
616 | if (ret) { | |
617 | goto error; | |
618 | } | |
619 | } | |
620 | ||
621 | if (revents & LPOLLOUT) { | |
622 | ret = handle_notification_thread_client_out( | |
623 | &state, fd); | |
624 | if (ret) { | |
625 | goto error; | |
626 | } | |
627 | } | |
628 | } | |
629 | } | |
630 | } | |
631 | } | |
632 | exit: | |
633 | error: | |
634 | fini_thread_state(&state); | |
f620cc28 | 635 | end: |
ab0ee2ca JG |
636 | rcu_thread_offline(); |
637 | rcu_unregister_thread(); | |
f620cc28 | 638 | health_unregister(health_sessiond); |
ab0ee2ca JG |
639 | return NULL; |
640 | } | |
c8a9de5a JG |
641 | |
642 | static | |
643 | bool shutdown_notification_thread(void *thread_data) | |
644 | { | |
645 | struct notification_thread_handle *handle = thread_data; | |
646 | ||
647 | notification_thread_command_quit(handle); | |
648 | return true; | |
649 | } | |
650 | ||
4a91420c JG |
651 | struct lttng_thread *launch_notification_thread( |
652 | struct notification_thread_handle *handle) | |
c8a9de5a JG |
653 | { |
654 | struct lttng_thread *thread; | |
655 | ||
656 | thread = lttng_thread_create("Notification", | |
657 | thread_notification, | |
658 | shutdown_notification_thread, | |
659 | NULL, | |
660 | handle); | |
661 | if (!thread) { | |
662 | goto error; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Wait for the thread to be marked as "ready" before returning | |
667 | * as other subsystems depend on the notification subsystem | |
668 | * (e.g. rotation thread). | |
669 | */ | |
670 | wait_until_thread_is_ready(handle); | |
4a91420c | 671 | return thread; |
c8a9de5a | 672 | error: |
4a91420c | 673 | return NULL; |
c8a9de5a | 674 | } |