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ab0ee2ca JG |
1 | /* |
2 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _LGPL_SOURCE | |
19 | #include <lttng/trigger/trigger.h> | |
20 | #include <lttng/notification/channel-internal.h> | |
21 | #include <lttng/notification/notification-internal.h> | |
22 | #include <lttng/condition/condition-internal.h> | |
23 | #include <lttng/condition/buffer-usage-internal.h> | |
24 | #include <common/error.h> | |
25 | #include <common/config/session-config.h> | |
26 | #include <common/defaults.h> | |
27 | #include <common/utils.h> | |
ab0ee2ca JG |
28 | #include <common/align.h> |
29 | #include <common/time.h> | |
30 | #include <sys/eventfd.h> | |
31 | #include <sys/stat.h> | |
32 | #include <time.h> | |
33 | #include <signal.h> | |
34 | ||
35 | #include "notification-thread.h" | |
36 | #include "notification-thread-events.h" | |
37 | #include "notification-thread-commands.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "health-sessiond.h" | |
c8a9de5a | 40 | #include "thread.h" |
ab0ee2ca JG |
41 | |
42 | #include <urcu.h> | |
43 | #include <urcu/list.h> | |
44 | #include <urcu/rculfhash.h> | |
45 | ||
ab0ee2ca JG |
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; | |
ab0ee2ca JG |
53 | |
54 | if (!handle) { | |
55 | goto end; | |
56 | } | |
57 | ||
8ada111f | 58 | assert(cds_list_empty(&handle->cmd_queue.list)); |
ab0ee2ca | 59 | pthread_mutex_destroy(&handle->cmd_queue.lock); |
c8a9de5a | 60 | sem_destroy(&handle->ready); |
ab0ee2ca | 61 | |
814b4934 JR |
62 | if (handle->cmd_queue.event_pipe) { |
63 | lttng_pipe_destroy(handle->cmd_queue.event_pipe); | |
64 | } | |
ab0ee2ca JG |
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 | end: | |
84 | free(handle); | |
85 | } | |
86 | ||
87 | struct notification_thread_handle *notification_thread_handle_create( | |
88 | struct lttng_pipe *ust32_channel_monitor_pipe, | |
89 | struct lttng_pipe *ust64_channel_monitor_pipe, | |
c8a9de5a | 90 | struct lttng_pipe *kernel_channel_monitor_pipe) |
ab0ee2ca JG |
91 | { |
92 | int ret; | |
93 | struct notification_thread_handle *handle; | |
814b4934 | 94 | struct lttng_pipe *event_pipe = NULL; |
ab0ee2ca JG |
95 | |
96 | handle = zmalloc(sizeof(*handle)); | |
97 | if (!handle) { | |
98 | goto end; | |
99 | } | |
100 | ||
c8a9de5a JG |
101 | sem_init(&handle->ready, 0, 0); |
102 | ||
18d08850 | 103 | event_pipe = lttng_pipe_open(FD_CLOEXEC); |
814b4934 JR |
104 | if (!event_pipe) { |
105 | ERR("event_pipe creation"); | |
ab0ee2ca JG |
106 | goto error; |
107 | } | |
814b4934 JR |
108 | |
109 | handle->cmd_queue.event_pipe = event_pipe; | |
110 | event_pipe = NULL; | |
111 | ||
ab0ee2ca JG |
112 | CDS_INIT_LIST_HEAD(&handle->cmd_queue.list); |
113 | ret = pthread_mutex_init(&handle->cmd_queue.lock, NULL); | |
114 | if (ret) { | |
115 | goto error; | |
116 | } | |
117 | ||
118 | if (ust32_channel_monitor_pipe) { | |
119 | handle->channel_monitoring_pipes.ust32_consumer = | |
120 | lttng_pipe_release_readfd( | |
121 | ust32_channel_monitor_pipe); | |
122 | if (handle->channel_monitoring_pipes.ust32_consumer < 0) { | |
123 | goto error; | |
124 | } | |
125 | } else { | |
126 | handle->channel_monitoring_pipes.ust32_consumer = -1; | |
127 | } | |
128 | if (ust64_channel_monitor_pipe) { | |
129 | handle->channel_monitoring_pipes.ust64_consumer = | |
130 | lttng_pipe_release_readfd( | |
131 | ust64_channel_monitor_pipe); | |
132 | if (handle->channel_monitoring_pipes.ust64_consumer < 0) { | |
133 | goto error; | |
134 | } | |
135 | } else { | |
136 | handle->channel_monitoring_pipes.ust64_consumer = -1; | |
137 | } | |
138 | if (kernel_channel_monitor_pipe) { | |
139 | handle->channel_monitoring_pipes.kernel_consumer = | |
140 | lttng_pipe_release_readfd( | |
141 | kernel_channel_monitor_pipe); | |
142 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { | |
143 | goto error; | |
144 | } | |
145 | } else { | |
146 | handle->channel_monitoring_pipes.kernel_consumer = -1; | |
147 | } | |
148 | end: | |
149 | return handle; | |
150 | error: | |
814b4934 | 151 | lttng_pipe_destroy(event_pipe); |
ab0ee2ca JG |
152 | notification_thread_handle_destroy(handle); |
153 | return NULL; | |
154 | } | |
155 | ||
156 | static | |
157 | char *get_notification_channel_sock_path(void) | |
158 | { | |
159 | int ret; | |
160 | bool is_root = !getuid(); | |
161 | char *sock_path; | |
162 | ||
163 | sock_path = zmalloc(LTTNG_PATH_MAX); | |
164 | if (!sock_path) { | |
165 | goto error; | |
166 | } | |
167 | ||
168 | if (is_root) { | |
169 | ret = snprintf(sock_path, LTTNG_PATH_MAX, | |
170 | DEFAULT_GLOBAL_NOTIFICATION_CHANNEL_UNIX_SOCK); | |
171 | if (ret < 0) { | |
172 | goto error; | |
173 | } | |
174 | } else { | |
4f00620d | 175 | const char *home_path = utils_get_home_dir(); |
ab0ee2ca JG |
176 | |
177 | if (!home_path) { | |
178 | ERR("Can't get HOME directory for socket creation"); | |
179 | goto error; | |
180 | } | |
181 | ||
182 | ret = snprintf(sock_path, LTTNG_PATH_MAX, | |
183 | DEFAULT_HOME_NOTIFICATION_CHANNEL_UNIX_SOCK, | |
184 | home_path); | |
185 | if (ret < 0) { | |
186 | goto error; | |
187 | } | |
188 | } | |
189 | ||
190 | return sock_path; | |
191 | error: | |
192 | free(sock_path); | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | static | |
197 | void notification_channel_socket_destroy(int fd) | |
198 | { | |
199 | int ret; | |
200 | char *sock_path = get_notification_channel_sock_path(); | |
201 | ||
202 | DBG("[notification-thread] Destroying notification channel socket"); | |
203 | ||
204 | if (sock_path) { | |
205 | ret = unlink(sock_path); | |
206 | free(sock_path); | |
207 | if (ret < 0) { | |
208 | PERROR("unlink notification channel socket"); | |
209 | } | |
210 | } | |
211 | ||
212 | ret = close(fd); | |
213 | if (ret) { | |
214 | PERROR("close notification channel socket"); | |
215 | } | |
216 | } | |
217 | ||
218 | static | |
219 | int notification_channel_socket_create(void) | |
220 | { | |
221 | int fd = -1, ret; | |
222 | char *sock_path = get_notification_channel_sock_path(); | |
223 | ||
224 | DBG("[notification-thread] Creating notification channel UNIX socket at %s", | |
225 | sock_path); | |
226 | ||
227 | ret = lttcomm_create_unix_sock(sock_path); | |
228 | if (ret < 0) { | |
229 | ERR("[notification-thread] Failed to create notification socket"); | |
230 | goto error; | |
231 | } | |
232 | fd = ret; | |
233 | ||
234 | ret = chmod(sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
235 | if (ret < 0) { | |
236 | ERR("Set file permissions failed: %s", sock_path); | |
237 | PERROR("chmod notification channel socket"); | |
238 | goto error; | |
239 | } | |
240 | ||
241 | if (getuid() == 0) { | |
28ab59d0 JR |
242 | gid_t gid; |
243 | ||
244 | ret = utils_get_group_id(config.tracing_group_name.value, true, | |
245 | &gid); | |
246 | if (ret) { | |
247 | /* Default to root group. */ | |
248 | gid = 0; | |
249 | } | |
250 | ||
251 | ret = chown(sock_path, 0, gid); | |
ab0ee2ca JG |
252 | if (ret) { |
253 | ERR("Failed to set the notification channel socket's group"); | |
254 | ret = -1; | |
255 | goto error; | |
256 | } | |
257 | } | |
258 | ||
259 | DBG("[notification-thread] Notification channel UNIX socket created (fd = %i)", | |
260 | fd); | |
261 | free(sock_path); | |
262 | return fd; | |
263 | error: | |
264 | if (fd >= 0 && close(fd) < 0) { | |
265 | PERROR("close notification channel socket"); | |
266 | } | |
267 | free(sock_path); | |
268 | return ret; | |
269 | } | |
270 | ||
271 | static | |
272 | int init_poll_set(struct lttng_poll_event *poll_set, | |
273 | struct notification_thread_handle *handle, | |
274 | int notification_channel_socket) | |
275 | { | |
276 | int ret; | |
277 | ||
278 | /* | |
279 | * Create pollset with size 5: | |
280 | * - notification channel socket (listen for new connections), | |
281 | * - command queue event fd (internal sessiond commands), | |
282 | * - consumerd (32-bit user space) channel monitor pipe, | |
283 | * - consumerd (64-bit user space) channel monitor pipe, | |
284 | * - consumerd (kernel) channel monitor pipe. | |
285 | */ | |
286 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); | |
287 | if (ret < 0) { | |
288 | goto end; | |
289 | } | |
290 | ||
291 | ret = lttng_poll_add(poll_set, notification_channel_socket, | |
292 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
293 | if (ret < 0) { | |
294 | ERR("[notification-thread] Failed to add notification channel socket to pollset"); | |
295 | goto error; | |
296 | } | |
814b4934 | 297 | ret = lttng_poll_add(poll_set, lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), |
ab0ee2ca JG |
298 | LPOLLIN | LPOLLERR); |
299 | if (ret < 0) { | |
300 | ERR("[notification-thread] Failed to add notification command queue event fd to pollset"); | |
301 | goto error; | |
302 | } | |
303 | ret = lttng_poll_add(poll_set, | |
304 | handle->channel_monitoring_pipes.ust32_consumer, | |
305 | LPOLLIN | LPOLLERR); | |
306 | if (ret < 0) { | |
307 | ERR("[notification-thread] Failed to add ust-32 channel monitoring pipe fd to pollset"); | |
308 | goto error; | |
309 | } | |
310 | ret = lttng_poll_add(poll_set, | |
311 | handle->channel_monitoring_pipes.ust64_consumer, | |
312 | LPOLLIN | LPOLLERR); | |
313 | if (ret < 0) { | |
314 | ERR("[notification-thread] Failed to add ust-64 channel monitoring pipe fd to pollset"); | |
315 | goto error; | |
316 | } | |
317 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { | |
318 | goto end; | |
319 | } | |
320 | ret = lttng_poll_add(poll_set, | |
321 | handle->channel_monitoring_pipes.kernel_consumer, | |
322 | LPOLLIN | LPOLLERR); | |
323 | if (ret < 0) { | |
324 | ERR("[notification-thread] Failed to add kernel channel monitoring pipe fd to pollset"); | |
325 | goto error; | |
326 | } | |
327 | end: | |
328 | return ret; | |
329 | error: | |
330 | lttng_poll_clean(poll_set); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static | |
335 | void fini_thread_state(struct notification_thread_state *state) | |
336 | { | |
337 | int ret; | |
338 | ||
339 | if (state->client_socket_ht) { | |
340 | ret = handle_notification_thread_client_disconnect_all(state); | |
341 | assert(!ret); | |
342 | ret = cds_lfht_destroy(state->client_socket_ht, NULL); | |
343 | assert(!ret); | |
344 | } | |
345 | if (state->triggers_ht) { | |
346 | ret = handle_notification_thread_trigger_unregister_all(state); | |
347 | assert(!ret); | |
348 | ret = cds_lfht_destroy(state->triggers_ht, NULL); | |
349 | assert(!ret); | |
350 | } | |
351 | if (state->channel_triggers_ht) { | |
352 | ret = cds_lfht_destroy(state->channel_triggers_ht, NULL); | |
353 | assert(!ret); | |
354 | } | |
355 | if (state->channel_state_ht) { | |
356 | ret = cds_lfht_destroy(state->channel_state_ht, NULL); | |
357 | assert(!ret); | |
358 | } | |
359 | if (state->notification_trigger_clients_ht) { | |
360 | ret = cds_lfht_destroy(state->notification_trigger_clients_ht, | |
361 | NULL); | |
362 | assert(!ret); | |
363 | } | |
364 | if (state->channels_ht) { | |
8abe313a JG |
365 | ret = cds_lfht_destroy(state->channels_ht, NULL); |
366 | assert(!ret); | |
367 | } | |
368 | if (state->sessions_ht) { | |
369 | ret = cds_lfht_destroy(state->sessions_ht, NULL); | |
ab0ee2ca JG |
370 | assert(!ret); |
371 | } | |
ea9a44f0 JG |
372 | /* |
373 | * Must be destroyed after all channels have been destroyed. | |
374 | * See comment in struct lttng_session_trigger_list. | |
375 | */ | |
376 | if (state->session_triggers_ht) { | |
377 | ret = cds_lfht_destroy(state->session_triggers_ht, NULL); | |
378 | assert(!ret); | |
379 | } | |
ab0ee2ca JG |
380 | if (state->notification_channel_socket >= 0) { |
381 | notification_channel_socket_destroy( | |
382 | state->notification_channel_socket); | |
383 | } | |
384 | lttng_poll_clean(&state->events); | |
385 | } | |
386 | ||
c8a9de5a JG |
387 | static |
388 | void mark_thread_as_ready(struct notification_thread_handle *handle) | |
389 | { | |
390 | DBG("Marking notification thread as ready"); | |
391 | sem_post(&handle->ready); | |
392 | } | |
393 | ||
394 | static | |
395 | void wait_until_thread_is_ready(struct notification_thread_handle *handle) | |
396 | { | |
397 | DBG("Waiting for notification thread to be ready"); | |
398 | sem_wait(&handle->ready); | |
399 | DBG("Notification thread is ready"); | |
400 | } | |
401 | ||
ab0ee2ca JG |
402 | static |
403 | int init_thread_state(struct notification_thread_handle *handle, | |
404 | struct notification_thread_state *state) | |
405 | { | |
406 | int ret; | |
407 | ||
408 | memset(state, 0, sizeof(*state)); | |
409 | state->notification_channel_socket = -1; | |
410 | lttng_poll_init(&state->events); | |
411 | ||
412 | ret = notification_channel_socket_create(); | |
413 | if (ret < 0) { | |
414 | goto end; | |
415 | } | |
416 | state->notification_channel_socket = ret; | |
417 | ||
418 | ret = init_poll_set(&state->events, handle, | |
419 | state->notification_channel_socket); | |
420 | if (ret) { | |
421 | goto end; | |
422 | } | |
423 | ||
424 | DBG("[notification-thread] Listening on notification channel socket"); | |
425 | ret = lttcomm_listen_unix_sock(state->notification_channel_socket); | |
426 | if (ret < 0) { | |
427 | ERR("[notification-thread] Listen failed on notification channel socket"); | |
428 | goto error; | |
429 | } | |
430 | ||
431 | state->client_socket_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, | |
432 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
433 | if (!state->client_socket_ht) { | |
434 | goto error; | |
435 | } | |
436 | ||
437 | state->channel_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, | |
438 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
439 | if (!state->channel_triggers_ht) { | |
440 | goto error; | |
441 | } | |
442 | ||
ea9a44f0 JG |
443 | state->session_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
444 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
445 | if (!state->session_triggers_ht) { | |
446 | goto error; | |
447 | } | |
448 | ||
ab0ee2ca JG |
449 | state->channel_state_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
450 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
451 | if (!state->channel_state_ht) { | |
452 | goto error; | |
453 | } | |
454 | ||
455 | state->notification_trigger_clients_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
456 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
457 | if (!state->notification_trigger_clients_ht) { | |
458 | goto error; | |
459 | } | |
460 | ||
461 | state->channels_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
462 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
463 | if (!state->channels_ht) { | |
464 | goto error; | |
465 | } | |
8abe313a JG |
466 | state->sessions_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
467 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
468 | if (!state->sessions_ht) { | |
469 | goto error; | |
470 | } | |
ab0ee2ca JG |
471 | state->triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
472 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
473 | if (!state->triggers_ht) { | |
474 | goto error; | |
475 | } | |
c8a9de5a | 476 | mark_thread_as_ready(handle); |
ab0ee2ca JG |
477 | end: |
478 | return 0; | |
479 | error: | |
480 | fini_thread_state(state); | |
481 | return -1; | |
482 | } | |
483 | ||
484 | static | |
485 | int handle_channel_monitoring_pipe(int fd, uint32_t revents, | |
486 | struct notification_thread_handle *handle, | |
487 | struct notification_thread_state *state) | |
488 | { | |
489 | int ret = 0; | |
490 | enum lttng_domain_type domain; | |
491 | ||
492 | if (fd == handle->channel_monitoring_pipes.ust32_consumer || | |
493 | fd == handle->channel_monitoring_pipes.ust64_consumer) { | |
494 | domain = LTTNG_DOMAIN_UST; | |
495 | } else if (fd == handle->channel_monitoring_pipes.kernel_consumer) { | |
496 | domain = LTTNG_DOMAIN_KERNEL; | |
497 | } else { | |
498 | abort(); | |
499 | } | |
500 | ||
501 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
502 | ret = lttng_poll_del(&state->events, fd); | |
503 | if (ret) { | |
504 | ERR("[notification-thread] Failed to remove consumer monitoring pipe from poll set"); | |
505 | } | |
506 | goto end; | |
507 | } | |
508 | ||
509 | ret = handle_notification_thread_channel_sample( | |
510 | state, fd, domain); | |
511 | if (ret) { | |
4149ace8 | 512 | ERR("[notification-thread] Consumer sample handling error occurred"); |
ab0ee2ca JG |
513 | ret = -1; |
514 | goto end; | |
515 | } | |
516 | end: | |
517 | return ret; | |
518 | } | |
519 | ||
520 | /* | |
521 | * This thread services notification channel clients and commands received | |
522 | * from various lttng-sessiond components over a command queue. | |
523 | */ | |
c8a9de5a | 524 | static |
ab0ee2ca JG |
525 | void *thread_notification(void *data) |
526 | { | |
527 | int ret; | |
528 | struct notification_thread_handle *handle = data; | |
529 | struct notification_thread_state state; | |
530 | ||
531 | DBG("[notification-thread] Started notification thread"); | |
532 | ||
f620cc28 JG |
533 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_NOTIFICATION); |
534 | rcu_register_thread(); | |
535 | rcu_thread_online(); | |
536 | ||
ab0ee2ca JG |
537 | if (!handle) { |
538 | ERR("[notification-thread] Invalid thread context provided"); | |
539 | goto end; | |
540 | } | |
541 | ||
ab0ee2ca JG |
542 | health_code_update(); |
543 | ||
544 | ret = init_thread_state(handle, &state); | |
545 | if (ret) { | |
546 | goto end; | |
547 | } | |
548 | ||
ab0ee2ca JG |
549 | while (true) { |
550 | int fd_count, i; | |
551 | ||
552 | health_poll_entry(); | |
553 | DBG("[notification-thread] Entering poll wait"); | |
554 | ret = lttng_poll_wait(&state.events, -1); | |
555 | DBG("[notification-thread] Poll wait returned (%i)", ret); | |
556 | health_poll_exit(); | |
557 | if (ret < 0) { | |
558 | /* | |
559 | * Restart interrupted system call. | |
560 | */ | |
561 | if (errno == EINTR) { | |
562 | continue; | |
563 | } | |
564 | ERR("[notification-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
565 | goto error; | |
566 | } | |
567 | ||
568 | fd_count = ret; | |
569 | for (i = 0; i < fd_count; i++) { | |
570 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
571 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
572 | ||
573 | DBG("[notification-thread] Handling fd (%i) activity (%u)", fd, revents); | |
574 | ||
575 | if (fd == state.notification_channel_socket) { | |
576 | if (revents & LPOLLIN) { | |
577 | ret = handle_notification_thread_client_connect( | |
578 | &state); | |
579 | if (ret < 0) { | |
580 | goto error; | |
581 | } | |
582 | } else if (revents & | |
583 | (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
584 | ERR("[notification-thread] Notification socket poll error"); | |
585 | goto error; | |
586 | } else { | |
587 | ERR("[notification-thread] Unexpected poll events %u for notification socket %i", revents, fd); | |
588 | goto error; | |
589 | } | |
814b4934 | 590 | } else if (fd == lttng_pipe_get_readfd(handle->cmd_queue.event_pipe)) { |
ab0ee2ca JG |
591 | ret = handle_notification_thread_command(handle, |
592 | &state); | |
593 | if (ret < 0) { | |
594 | DBG("[notification-thread] Error encountered while servicing command queue"); | |
595 | goto error; | |
596 | } else if (ret > 0) { | |
597 | goto exit; | |
598 | } | |
599 | } else if (fd == handle->channel_monitoring_pipes.ust32_consumer || | |
600 | fd == handle->channel_monitoring_pipes.ust64_consumer || | |
601 | fd == handle->channel_monitoring_pipes.kernel_consumer) { | |
602 | ret = handle_channel_monitoring_pipe(fd, | |
603 | revents, handle, &state); | |
604 | if (ret) { | |
605 | goto error; | |
606 | } | |
607 | } else { | |
608 | /* Activity on a client's socket. */ | |
609 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
610 | /* | |
611 | * It doesn't matter if a command was | |
612 | * pending on the client socket at this | |
613 | * point since it now has no way to | |
614 | * receive the notifications to which | |
615 | * it was subscribing or unsubscribing. | |
616 | */ | |
617 | ret = handle_notification_thread_client_disconnect( | |
618 | fd, &state); | |
619 | if (ret) { | |
620 | goto error; | |
621 | } | |
622 | } else { | |
623 | if (revents & LPOLLIN) { | |
624 | ret = handle_notification_thread_client_in( | |
625 | &state, fd); | |
626 | if (ret) { | |
627 | goto error; | |
628 | } | |
629 | } | |
630 | ||
631 | if (revents & LPOLLOUT) { | |
632 | ret = handle_notification_thread_client_out( | |
633 | &state, fd); | |
634 | if (ret) { | |
635 | goto error; | |
636 | } | |
637 | } | |
638 | } | |
639 | } | |
640 | } | |
641 | } | |
642 | exit: | |
643 | error: | |
644 | fini_thread_state(&state); | |
f620cc28 | 645 | end: |
ab0ee2ca JG |
646 | rcu_thread_offline(); |
647 | rcu_unregister_thread(); | |
f620cc28 | 648 | health_unregister(health_sessiond); |
ab0ee2ca JG |
649 | return NULL; |
650 | } | |
c8a9de5a JG |
651 | |
652 | static | |
653 | bool shutdown_notification_thread(void *thread_data) | |
654 | { | |
655 | struct notification_thread_handle *handle = thread_data; | |
656 | ||
657 | notification_thread_command_quit(handle); | |
658 | return true; | |
659 | } | |
660 | ||
4a91420c JG |
661 | struct lttng_thread *launch_notification_thread( |
662 | struct notification_thread_handle *handle) | |
c8a9de5a JG |
663 | { |
664 | struct lttng_thread *thread; | |
665 | ||
666 | thread = lttng_thread_create("Notification", | |
667 | thread_notification, | |
668 | shutdown_notification_thread, | |
669 | NULL, | |
670 | handle); | |
671 | if (!thread) { | |
672 | goto error; | |
673 | } | |
674 | ||
675 | /* | |
676 | * Wait for the thread to be marked as "ready" before returning | |
677 | * as other subsystems depend on the notification subsystem | |
678 | * (e.g. rotation thread). | |
679 | */ | |
680 | wait_until_thread_is_ready(handle); | |
4a91420c | 681 | return thread; |
c8a9de5a | 682 | error: |
4a91420c | 683 | return NULL; |
c8a9de5a | 684 | } |