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> | |
ab0ee2ca JG |
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" | |
c8a9de5a | 29 | #include "thread.h" |
ab0ee2ca JG |
30 | |
31 | #include <urcu.h> | |
32 | #include <urcu/list.h> | |
33 | #include <urcu/rculfhash.h> | |
34 | ||
ab0ee2ca JG |
35 | /* |
36 | * Destroy the thread data previously created by the init function. | |
37 | */ | |
38 | void notification_thread_handle_destroy( | |
39 | struct notification_thread_handle *handle) | |
40 | { | |
41 | int ret; | |
ab0ee2ca JG |
42 | |
43 | if (!handle) { | |
44 | goto end; | |
45 | } | |
46 | ||
8ada111f | 47 | assert(cds_list_empty(&handle->cmd_queue.list)); |
ab0ee2ca | 48 | pthread_mutex_destroy(&handle->cmd_queue.lock); |
c8a9de5a | 49 | sem_destroy(&handle->ready); |
ab0ee2ca | 50 | |
814b4934 JR |
51 | if (handle->cmd_queue.event_pipe) { |
52 | lttng_pipe_destroy(handle->cmd_queue.event_pipe); | |
53 | } | |
ab0ee2ca JG |
54 | if (handle->channel_monitoring_pipes.ust32_consumer >= 0) { |
55 | ret = close(handle->channel_monitoring_pipes.ust32_consumer); | |
56 | if (ret) { | |
57 | PERROR("close 32-bit consumer channel monitoring pipe"); | |
58 | } | |
59 | } | |
60 | if (handle->channel_monitoring_pipes.ust64_consumer >= 0) { | |
61 | ret = close(handle->channel_monitoring_pipes.ust64_consumer); | |
62 | if (ret) { | |
63 | PERROR("close 64-bit consumer channel monitoring pipe"); | |
64 | } | |
65 | } | |
66 | if (handle->channel_monitoring_pipes.kernel_consumer >= 0) { | |
67 | ret = close(handle->channel_monitoring_pipes.kernel_consumer); | |
68 | if (ret) { | |
69 | PERROR("close kernel consumer channel monitoring pipe"); | |
70 | } | |
71 | } | |
72 | end: | |
73 | free(handle); | |
74 | } | |
75 | ||
76 | struct notification_thread_handle *notification_thread_handle_create( | |
77 | struct lttng_pipe *ust32_channel_monitor_pipe, | |
78 | struct lttng_pipe *ust64_channel_monitor_pipe, | |
c8a9de5a | 79 | struct lttng_pipe *kernel_channel_monitor_pipe) |
ab0ee2ca JG |
80 | { |
81 | int ret; | |
82 | struct notification_thread_handle *handle; | |
814b4934 | 83 | struct lttng_pipe *event_pipe = NULL; |
ab0ee2ca JG |
84 | |
85 | handle = zmalloc(sizeof(*handle)); | |
86 | if (!handle) { | |
87 | goto end; | |
88 | } | |
89 | ||
c8a9de5a JG |
90 | sem_init(&handle->ready, 0, 0); |
91 | ||
18d08850 | 92 | event_pipe = lttng_pipe_open(FD_CLOEXEC); |
814b4934 JR |
93 | if (!event_pipe) { |
94 | ERR("event_pipe creation"); | |
ab0ee2ca JG |
95 | goto error; |
96 | } | |
814b4934 JR |
97 | |
98 | handle->cmd_queue.event_pipe = event_pipe; | |
99 | event_pipe = NULL; | |
100 | ||
ab0ee2ca JG |
101 | CDS_INIT_LIST_HEAD(&handle->cmd_queue.list); |
102 | ret = pthread_mutex_init(&handle->cmd_queue.lock, NULL); | |
103 | if (ret) { | |
104 | goto error; | |
105 | } | |
106 | ||
107 | if (ust32_channel_monitor_pipe) { | |
108 | handle->channel_monitoring_pipes.ust32_consumer = | |
109 | lttng_pipe_release_readfd( | |
110 | ust32_channel_monitor_pipe); | |
111 | if (handle->channel_monitoring_pipes.ust32_consumer < 0) { | |
112 | goto error; | |
113 | } | |
114 | } else { | |
115 | handle->channel_monitoring_pipes.ust32_consumer = -1; | |
116 | } | |
117 | if (ust64_channel_monitor_pipe) { | |
118 | handle->channel_monitoring_pipes.ust64_consumer = | |
119 | lttng_pipe_release_readfd( | |
120 | ust64_channel_monitor_pipe); | |
121 | if (handle->channel_monitoring_pipes.ust64_consumer < 0) { | |
122 | goto error; | |
123 | } | |
124 | } else { | |
125 | handle->channel_monitoring_pipes.ust64_consumer = -1; | |
126 | } | |
127 | if (kernel_channel_monitor_pipe) { | |
128 | handle->channel_monitoring_pipes.kernel_consumer = | |
129 | lttng_pipe_release_readfd( | |
130 | kernel_channel_monitor_pipe); | |
131 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { | |
132 | goto error; | |
133 | } | |
134 | } else { | |
135 | handle->channel_monitoring_pipes.kernel_consumer = -1; | |
136 | } | |
137 | end: | |
138 | return handle; | |
139 | error: | |
814b4934 | 140 | lttng_pipe_destroy(event_pipe); |
ab0ee2ca JG |
141 | notification_thread_handle_destroy(handle); |
142 | return NULL; | |
143 | } | |
144 | ||
145 | static | |
146 | char *get_notification_channel_sock_path(void) | |
147 | { | |
148 | int ret; | |
149 | bool is_root = !getuid(); | |
150 | char *sock_path; | |
151 | ||
152 | sock_path = zmalloc(LTTNG_PATH_MAX); | |
153 | if (!sock_path) { | |
154 | goto error; | |
155 | } | |
156 | ||
157 | if (is_root) { | |
158 | ret = snprintf(sock_path, LTTNG_PATH_MAX, | |
159 | DEFAULT_GLOBAL_NOTIFICATION_CHANNEL_UNIX_SOCK); | |
160 | if (ret < 0) { | |
161 | goto error; | |
162 | } | |
163 | } else { | |
4f00620d | 164 | const char *home_path = utils_get_home_dir(); |
ab0ee2ca JG |
165 | |
166 | if (!home_path) { | |
167 | ERR("Can't get HOME directory for socket creation"); | |
168 | goto error; | |
169 | } | |
170 | ||
171 | ret = snprintf(sock_path, LTTNG_PATH_MAX, | |
172 | DEFAULT_HOME_NOTIFICATION_CHANNEL_UNIX_SOCK, | |
173 | home_path); | |
174 | if (ret < 0) { | |
175 | goto error; | |
176 | } | |
177 | } | |
178 | ||
179 | return sock_path; | |
180 | error: | |
181 | free(sock_path); | |
182 | return NULL; | |
183 | } | |
184 | ||
185 | static | |
186 | void notification_channel_socket_destroy(int fd) | |
187 | { | |
188 | int ret; | |
189 | char *sock_path = get_notification_channel_sock_path(); | |
190 | ||
191 | DBG("[notification-thread] Destroying notification channel socket"); | |
192 | ||
193 | if (sock_path) { | |
194 | ret = unlink(sock_path); | |
195 | free(sock_path); | |
196 | if (ret < 0) { | |
197 | PERROR("unlink notification channel socket"); | |
198 | } | |
199 | } | |
200 | ||
201 | ret = close(fd); | |
202 | if (ret) { | |
203 | PERROR("close notification channel socket"); | |
204 | } | |
205 | } | |
206 | ||
207 | static | |
208 | int notification_channel_socket_create(void) | |
209 | { | |
210 | int fd = -1, ret; | |
211 | char *sock_path = get_notification_channel_sock_path(); | |
212 | ||
213 | DBG("[notification-thread] Creating notification channel UNIX socket at %s", | |
214 | sock_path); | |
215 | ||
216 | ret = lttcomm_create_unix_sock(sock_path); | |
217 | if (ret < 0) { | |
218 | ERR("[notification-thread] Failed to create notification socket"); | |
219 | goto error; | |
220 | } | |
221 | fd = ret; | |
222 | ||
223 | ret = chmod(sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
224 | if (ret < 0) { | |
225 | ERR("Set file permissions failed: %s", sock_path); | |
226 | PERROR("chmod notification channel socket"); | |
227 | goto error; | |
228 | } | |
229 | ||
230 | if (getuid() == 0) { | |
28ab59d0 JR |
231 | gid_t gid; |
232 | ||
233 | ret = utils_get_group_id(config.tracing_group_name.value, true, | |
234 | &gid); | |
235 | if (ret) { | |
236 | /* Default to root group. */ | |
237 | gid = 0; | |
238 | } | |
239 | ||
240 | ret = chown(sock_path, 0, gid); | |
ab0ee2ca JG |
241 | if (ret) { |
242 | ERR("Failed to set the notification channel socket's group"); | |
243 | ret = -1; | |
244 | goto error; | |
245 | } | |
246 | } | |
247 | ||
248 | DBG("[notification-thread] Notification channel UNIX socket created (fd = %i)", | |
249 | fd); | |
250 | free(sock_path); | |
251 | return fd; | |
252 | error: | |
253 | if (fd >= 0 && close(fd) < 0) { | |
254 | PERROR("close notification channel socket"); | |
255 | } | |
256 | free(sock_path); | |
257 | return ret; | |
258 | } | |
259 | ||
260 | static | |
261 | int init_poll_set(struct lttng_poll_event *poll_set, | |
262 | struct notification_thread_handle *handle, | |
263 | int notification_channel_socket) | |
264 | { | |
265 | int ret; | |
266 | ||
267 | /* | |
268 | * Create pollset with size 5: | |
269 | * - notification channel socket (listen for new connections), | |
270 | * - command queue event fd (internal sessiond commands), | |
271 | * - consumerd (32-bit user space) channel monitor pipe, | |
272 | * - consumerd (64-bit user space) channel monitor pipe, | |
273 | * - consumerd (kernel) channel monitor pipe. | |
274 | */ | |
275 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); | |
276 | if (ret < 0) { | |
277 | goto end; | |
278 | } | |
279 | ||
280 | ret = lttng_poll_add(poll_set, notification_channel_socket, | |
281 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
282 | if (ret < 0) { | |
283 | ERR("[notification-thread] Failed to add notification channel socket to pollset"); | |
284 | goto error; | |
285 | } | |
814b4934 | 286 | ret = lttng_poll_add(poll_set, lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), |
ab0ee2ca JG |
287 | LPOLLIN | LPOLLERR); |
288 | if (ret < 0) { | |
289 | ERR("[notification-thread] Failed to add notification command queue event fd to pollset"); | |
290 | goto error; | |
291 | } | |
292 | ret = lttng_poll_add(poll_set, | |
293 | handle->channel_monitoring_pipes.ust32_consumer, | |
294 | LPOLLIN | LPOLLERR); | |
295 | if (ret < 0) { | |
296 | ERR("[notification-thread] Failed to add ust-32 channel monitoring pipe fd to pollset"); | |
297 | goto error; | |
298 | } | |
299 | ret = lttng_poll_add(poll_set, | |
300 | handle->channel_monitoring_pipes.ust64_consumer, | |
301 | LPOLLIN | LPOLLERR); | |
302 | if (ret < 0) { | |
303 | ERR("[notification-thread] Failed to add ust-64 channel monitoring pipe fd to pollset"); | |
304 | goto error; | |
305 | } | |
306 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { | |
307 | goto end; | |
308 | } | |
309 | ret = lttng_poll_add(poll_set, | |
310 | handle->channel_monitoring_pipes.kernel_consumer, | |
311 | LPOLLIN | LPOLLERR); | |
312 | if (ret < 0) { | |
313 | ERR("[notification-thread] Failed to add kernel channel monitoring pipe fd to pollset"); | |
314 | goto error; | |
315 | } | |
316 | end: | |
317 | return ret; | |
318 | error: | |
319 | lttng_poll_clean(poll_set); | |
320 | return ret; | |
321 | } | |
322 | ||
323 | static | |
324 | void fini_thread_state(struct notification_thread_state *state) | |
325 | { | |
326 | int ret; | |
327 | ||
328 | if (state->client_socket_ht) { | |
329 | ret = handle_notification_thread_client_disconnect_all(state); | |
330 | assert(!ret); | |
331 | ret = cds_lfht_destroy(state->client_socket_ht, NULL); | |
332 | assert(!ret); | |
333 | } | |
ac1889bf JG |
334 | if (state->client_id_ht) { |
335 | ret = cds_lfht_destroy(state->client_id_ht, NULL); | |
336 | assert(!ret); | |
337 | } | |
ab0ee2ca JG |
338 | if (state->triggers_ht) { |
339 | ret = handle_notification_thread_trigger_unregister_all(state); | |
340 | assert(!ret); | |
341 | ret = cds_lfht_destroy(state->triggers_ht, NULL); | |
342 | assert(!ret); | |
343 | } | |
344 | if (state->channel_triggers_ht) { | |
345 | ret = cds_lfht_destroy(state->channel_triggers_ht, NULL); | |
346 | assert(!ret); | |
347 | } | |
348 | if (state->channel_state_ht) { | |
349 | ret = cds_lfht_destroy(state->channel_state_ht, NULL); | |
350 | assert(!ret); | |
351 | } | |
352 | if (state->notification_trigger_clients_ht) { | |
353 | ret = cds_lfht_destroy(state->notification_trigger_clients_ht, | |
354 | NULL); | |
355 | assert(!ret); | |
356 | } | |
357 | if (state->channels_ht) { | |
8abe313a JG |
358 | ret = cds_lfht_destroy(state->channels_ht, NULL); |
359 | assert(!ret); | |
360 | } | |
361 | if (state->sessions_ht) { | |
362 | ret = cds_lfht_destroy(state->sessions_ht, NULL); | |
ab0ee2ca JG |
363 | assert(!ret); |
364 | } | |
ea9a44f0 JG |
365 | /* |
366 | * Must be destroyed after all channels have been destroyed. | |
367 | * See comment in struct lttng_session_trigger_list. | |
368 | */ | |
369 | if (state->session_triggers_ht) { | |
370 | ret = cds_lfht_destroy(state->session_triggers_ht, NULL); | |
371 | assert(!ret); | |
372 | } | |
ab0ee2ca JG |
373 | if (state->notification_channel_socket >= 0) { |
374 | notification_channel_socket_destroy( | |
375 | state->notification_channel_socket); | |
376 | } | |
f2b3ef9f JG |
377 | if (state->executor) { |
378 | action_executor_destroy(state->executor); | |
379 | } | |
ab0ee2ca JG |
380 | lttng_poll_clean(&state->events); |
381 | } | |
382 | ||
c8a9de5a JG |
383 | static |
384 | void mark_thread_as_ready(struct notification_thread_handle *handle) | |
385 | { | |
386 | DBG("Marking notification thread as ready"); | |
387 | sem_post(&handle->ready); | |
388 | } | |
389 | ||
390 | static | |
391 | void wait_until_thread_is_ready(struct notification_thread_handle *handle) | |
392 | { | |
393 | DBG("Waiting for notification thread to be ready"); | |
394 | sem_wait(&handle->ready); | |
395 | DBG("Notification thread is ready"); | |
396 | } | |
397 | ||
ab0ee2ca JG |
398 | static |
399 | int init_thread_state(struct notification_thread_handle *handle, | |
400 | struct notification_thread_state *state) | |
401 | { | |
402 | int ret; | |
403 | ||
404 | memset(state, 0, sizeof(*state)); | |
405 | state->notification_channel_socket = -1; | |
406 | lttng_poll_init(&state->events); | |
407 | ||
408 | ret = notification_channel_socket_create(); | |
409 | if (ret < 0) { | |
410 | goto end; | |
411 | } | |
412 | state->notification_channel_socket = ret; | |
413 | ||
414 | ret = init_poll_set(&state->events, handle, | |
415 | state->notification_channel_socket); | |
416 | if (ret) { | |
417 | goto end; | |
418 | } | |
419 | ||
420 | DBG("[notification-thread] Listening on notification channel socket"); | |
421 | ret = lttcomm_listen_unix_sock(state->notification_channel_socket); | |
422 | if (ret < 0) { | |
423 | ERR("[notification-thread] Listen failed on notification channel socket"); | |
424 | goto error; | |
425 | } | |
426 | ||
427 | state->client_socket_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, | |
428 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
429 | if (!state->client_socket_ht) { | |
430 | goto error; | |
431 | } | |
432 | ||
ac1889bf JG |
433 | state->client_id_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
434 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
435 | if (!state->client_id_ht) { | |
436 | goto error; | |
437 | } | |
438 | ||
ab0ee2ca JG |
439 | state->channel_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
440 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
441 | if (!state->channel_triggers_ht) { | |
442 | goto error; | |
443 | } | |
444 | ||
ea9a44f0 JG |
445 | state->session_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
446 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
447 | if (!state->session_triggers_ht) { | |
448 | goto error; | |
449 | } | |
450 | ||
ab0ee2ca JG |
451 | state->channel_state_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
452 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
453 | if (!state->channel_state_ht) { | |
454 | goto error; | |
455 | } | |
456 | ||
457 | state->notification_trigger_clients_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
458 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
459 | if (!state->notification_trigger_clients_ht) { | |
460 | goto error; | |
461 | } | |
462 | ||
463 | state->channels_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
464 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
465 | if (!state->channels_ht) { | |
466 | goto error; | |
467 | } | |
8abe313a JG |
468 | state->sessions_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
469 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
470 | if (!state->sessions_ht) { | |
471 | goto error; | |
472 | } | |
ab0ee2ca JG |
473 | state->triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
474 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
475 | if (!state->triggers_ht) { | |
476 | goto error; | |
f2b3ef9f JG |
477 | } |
478 | ||
479 | state->executor = action_executor_create(handle); | |
480 | if (!state->executor) { | |
481 | goto error; | |
ab0ee2ca | 482 | } |
c8a9de5a | 483 | mark_thread_as_ready(handle); |
ab0ee2ca JG |
484 | end: |
485 | return 0; | |
486 | error: | |
487 | fini_thread_state(state); | |
488 | return -1; | |
489 | } | |
490 | ||
491 | static | |
492 | int handle_channel_monitoring_pipe(int fd, uint32_t revents, | |
493 | struct notification_thread_handle *handle, | |
494 | struct notification_thread_state *state) | |
495 | { | |
496 | int ret = 0; | |
497 | enum lttng_domain_type domain; | |
498 | ||
499 | if (fd == handle->channel_monitoring_pipes.ust32_consumer || | |
500 | fd == handle->channel_monitoring_pipes.ust64_consumer) { | |
501 | domain = LTTNG_DOMAIN_UST; | |
502 | } else if (fd == handle->channel_monitoring_pipes.kernel_consumer) { | |
503 | domain = LTTNG_DOMAIN_KERNEL; | |
504 | } else { | |
505 | abort(); | |
506 | } | |
507 | ||
508 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
509 | ret = lttng_poll_del(&state->events, fd); | |
510 | if (ret) { | |
511 | ERR("[notification-thread] Failed to remove consumer monitoring pipe from poll set"); | |
512 | } | |
513 | goto end; | |
514 | } | |
515 | ||
516 | ret = handle_notification_thread_channel_sample( | |
517 | state, fd, domain); | |
518 | if (ret) { | |
4149ace8 | 519 | ERR("[notification-thread] Consumer sample handling error occurred"); |
ab0ee2ca JG |
520 | ret = -1; |
521 | goto end; | |
522 | } | |
523 | end: | |
524 | return ret; | |
525 | } | |
526 | ||
527 | /* | |
528 | * This thread services notification channel clients and commands received | |
529 | * from various lttng-sessiond components over a command queue. | |
530 | */ | |
c8a9de5a | 531 | static |
ab0ee2ca JG |
532 | void *thread_notification(void *data) |
533 | { | |
534 | int ret; | |
535 | struct notification_thread_handle *handle = data; | |
536 | struct notification_thread_state state; | |
537 | ||
538 | DBG("[notification-thread] Started notification thread"); | |
539 | ||
f620cc28 JG |
540 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_NOTIFICATION); |
541 | rcu_register_thread(); | |
542 | rcu_thread_online(); | |
543 | ||
ab0ee2ca JG |
544 | if (!handle) { |
545 | ERR("[notification-thread] Invalid thread context provided"); | |
546 | goto end; | |
547 | } | |
548 | ||
ab0ee2ca JG |
549 | health_code_update(); |
550 | ||
551 | ret = init_thread_state(handle, &state); | |
552 | if (ret) { | |
553 | goto end; | |
554 | } | |
555 | ||
ab0ee2ca JG |
556 | while (true) { |
557 | int fd_count, i; | |
558 | ||
559 | health_poll_entry(); | |
560 | DBG("[notification-thread] Entering poll wait"); | |
561 | ret = lttng_poll_wait(&state.events, -1); | |
562 | DBG("[notification-thread] Poll wait returned (%i)", ret); | |
563 | health_poll_exit(); | |
564 | if (ret < 0) { | |
565 | /* | |
566 | * Restart interrupted system call. | |
567 | */ | |
568 | if (errno == EINTR) { | |
569 | continue; | |
570 | } | |
571 | ERR("[notification-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
572 | goto error; | |
573 | } | |
574 | ||
575 | fd_count = ret; | |
576 | for (i = 0; i < fd_count; i++) { | |
577 | int fd = LTTNG_POLL_GETFD(&state.events, i); | |
578 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); | |
579 | ||
580 | DBG("[notification-thread] Handling fd (%i) activity (%u)", fd, revents); | |
581 | ||
582 | if (fd == state.notification_channel_socket) { | |
583 | if (revents & LPOLLIN) { | |
584 | ret = handle_notification_thread_client_connect( | |
585 | &state); | |
586 | if (ret < 0) { | |
587 | goto error; | |
588 | } | |
589 | } else if (revents & | |
590 | (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
591 | ERR("[notification-thread] Notification socket poll error"); | |
592 | goto error; | |
593 | } else { | |
594 | ERR("[notification-thread] Unexpected poll events %u for notification socket %i", revents, fd); | |
595 | goto error; | |
596 | } | |
814b4934 | 597 | } else if (fd == lttng_pipe_get_readfd(handle->cmd_queue.event_pipe)) { |
ab0ee2ca JG |
598 | ret = handle_notification_thread_command(handle, |
599 | &state); | |
600 | if (ret < 0) { | |
601 | DBG("[notification-thread] Error encountered while servicing command queue"); | |
602 | goto error; | |
603 | } else if (ret > 0) { | |
604 | goto exit; | |
605 | } | |
606 | } else if (fd == handle->channel_monitoring_pipes.ust32_consumer || | |
607 | fd == handle->channel_monitoring_pipes.ust64_consumer || | |
608 | fd == handle->channel_monitoring_pipes.kernel_consumer) { | |
609 | ret = handle_channel_monitoring_pipe(fd, | |
610 | revents, handle, &state); | |
611 | if (ret) { | |
612 | goto error; | |
613 | } | |
614 | } else { | |
615 | /* Activity on a client's socket. */ | |
616 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
617 | /* | |
618 | * It doesn't matter if a command was | |
619 | * pending on the client socket at this | |
620 | * point since it now has no way to | |
621 | * receive the notifications to which | |
622 | * it was subscribing or unsubscribing. | |
623 | */ | |
624 | ret = handle_notification_thread_client_disconnect( | |
625 | fd, &state); | |
626 | if (ret) { | |
627 | goto error; | |
628 | } | |
629 | } else { | |
630 | if (revents & LPOLLIN) { | |
631 | ret = handle_notification_thread_client_in( | |
632 | &state, fd); | |
633 | if (ret) { | |
634 | goto error; | |
635 | } | |
636 | } | |
637 | ||
638 | if (revents & LPOLLOUT) { | |
639 | ret = handle_notification_thread_client_out( | |
640 | &state, fd); | |
641 | if (ret) { | |
642 | goto error; | |
643 | } | |
644 | } | |
645 | } | |
646 | } | |
647 | } | |
648 | } | |
649 | exit: | |
650 | error: | |
651 | fini_thread_state(&state); | |
f620cc28 | 652 | end: |
ab0ee2ca JG |
653 | rcu_thread_offline(); |
654 | rcu_unregister_thread(); | |
f620cc28 | 655 | health_unregister(health_sessiond); |
ab0ee2ca JG |
656 | return NULL; |
657 | } | |
c8a9de5a JG |
658 | |
659 | static | |
660 | bool shutdown_notification_thread(void *thread_data) | |
661 | { | |
662 | struct notification_thread_handle *handle = thread_data; | |
663 | ||
664 | notification_thread_command_quit(handle); | |
665 | return true; | |
666 | } | |
667 | ||
4a91420c JG |
668 | struct lttng_thread *launch_notification_thread( |
669 | struct notification_thread_handle *handle) | |
c8a9de5a JG |
670 | { |
671 | struct lttng_thread *thread; | |
672 | ||
673 | thread = lttng_thread_create("Notification", | |
674 | thread_notification, | |
675 | shutdown_notification_thread, | |
676 | NULL, | |
677 | handle); | |
678 | if (!thread) { | |
679 | goto error; | |
680 | } | |
681 | ||
682 | /* | |
683 | * Wait for the thread to be marked as "ready" before returning | |
684 | * as other subsystems depend on the notification subsystem | |
685 | * (e.g. rotation thread). | |
686 | */ | |
687 | wait_until_thread_is_ready(handle); | |
4a91420c | 688 | return thread; |
c8a9de5a | 689 | error: |
4a91420c | 690 | return NULL; |
c8a9de5a | 691 | } |