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> | |
c9e313bc SM |
10 | #include <lttng/notification/channel-internal.hpp> |
11 | #include <lttng/notification/notification-internal.hpp> | |
12 | #include <lttng/condition/condition-internal.hpp> | |
13 | #include <lttng/condition/buffer-usage-internal.hpp> | |
14 | #include <common/error.hpp> | |
15 | #include <common/config/session-config.hpp> | |
16 | #include <common/defaults.hpp> | |
17 | #include <common/utils.hpp> | |
18 | #include <common/align.hpp> | |
19 | #include <common/time.hpp> | |
ab0ee2ca JG |
20 | #include <sys/stat.h> |
21 | #include <time.h> | |
22 | #include <signal.h> | |
23 | ||
c9e313bc SM |
24 | #include "notification-thread.hpp" |
25 | #include "notification-thread-events.hpp" | |
26 | #include "notification-thread-commands.hpp" | |
27 | #include "lttng-sessiond.hpp" | |
28 | #include "health-sessiond.hpp" | |
29 | #include "thread.hpp" | |
30 | #include "testpoint.hpp" | |
ab0ee2ca | 31 | |
c9e313bc SM |
32 | #include "kernel.hpp" |
33 | #include <common/kernel-ctl/kernel-ctl.hpp> | |
94078603 | 34 | |
ab0ee2ca JG |
35 | #include <urcu.h> |
36 | #include <urcu/list.h> | |
37 | #include <urcu/rculfhash.h> | |
38 | ||
4bd69c5f SM |
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; | |
38eb8a68 | 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 | ||
a0377dfe | 58 | LTTNG_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 | } | |
94078603 | 83 | |
ab0ee2ca JG |
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, | |
c8a9de5a | 91 | struct lttng_pipe *kernel_channel_monitor_pipe) |
ab0ee2ca JG |
92 | { |
93 | int ret; | |
94 | struct notification_thread_handle *handle; | |
814b4934 | 95 | struct lttng_pipe *event_pipe = NULL; |
ab0ee2ca | 96 | |
64803277 | 97 | handle = zmalloc<notification_thread_handle>(); |
ab0ee2ca JG |
98 | if (!handle) { |
99 | goto end; | |
100 | } | |
101 | ||
c8a9de5a JG |
102 | sem_init(&handle->ready, 0, 0); |
103 | ||
18d08850 | 104 | event_pipe = lttng_pipe_open(FD_CLOEXEC); |
814b4934 JR |
105 | if (!event_pipe) { |
106 | ERR("event_pipe creation"); | |
ab0ee2ca JG |
107 | goto error; |
108 | } | |
814b4934 JR |
109 | |
110 | handle->cmd_queue.event_pipe = event_pipe; | |
111 | event_pipe = NULL; | |
112 | ||
ab0ee2ca JG |
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 | } | |
d02d7404 | 149 | |
ab0ee2ca JG |
150 | end: |
151 | return handle; | |
152 | error: | |
814b4934 | 153 | lttng_pipe_destroy(event_pipe); |
ab0ee2ca JG |
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 | ||
64803277 | 165 | sock_path = calloc<char>(LTTNG_PATH_MAX); |
ab0ee2ca JG |
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 { | |
4f00620d | 177 | const char *home_path = utils_get_home_dir(); |
ab0ee2ca JG |
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 | ||
bd0514a5 | 204 | DBG("Destroying notification channel socket"); |
ab0ee2ca JG |
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 | ||
bd0514a5 | 226 | DBG("Creating notification channel UNIX socket at %s", |
ab0ee2ca JG |
227 | sock_path); |
228 | ||
229 | ret = lttcomm_create_unix_sock(sock_path); | |
230 | if (ret < 0) { | |
bd0514a5 | 231 | ERR("Failed to create notification socket"); |
ab0ee2ca JG |
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) { | |
28ab59d0 JR |
244 | gid_t gid; |
245 | ||
412d7227 SM |
246 | ret = utils_get_group_id(the_config.tracing_group_name.value, |
247 | true, &gid); | |
28ab59d0 JR |
248 | if (ret) { |
249 | /* Default to root group. */ | |
250 | gid = 0; | |
251 | } | |
252 | ||
253 | ret = chown(sock_path, 0, gid); | |
ab0ee2ca JG |
254 | if (ret) { |
255 | ERR("Failed to set the notification channel socket's group"); | |
256 | ret = -1; | |
257 | goto error; | |
258 | } | |
259 | } | |
260 | ||
bd0514a5 | 261 | DBG("Notification channel UNIX socket created (fd = %i)", |
ab0ee2ca JG |
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) { | |
bd0514a5 | 296 | ERR("Failed to add notification channel socket to pollset"); |
ab0ee2ca JG |
297 | goto error; |
298 | } | |
814b4934 | 299 | ret = lttng_poll_add(poll_set, lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), |
ab0ee2ca JG |
300 | LPOLLIN | LPOLLERR); |
301 | if (ret < 0) { | |
bd0514a5 | 302 | ERR("Failed to add notification command queue event fd to pollset"); |
ab0ee2ca JG |
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) { | |
bd0514a5 | 309 | ERR("Failed to add ust-32 channel monitoring pipe fd to pollset"); |
ab0ee2ca JG |
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) { | |
bd0514a5 | 316 | ERR("Failed to add ust-64 channel monitoring pipe fd to pollset"); |
ab0ee2ca JG |
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) { | |
bd0514a5 | 326 | ERR("Failed to add kernel channel monitoring pipe fd to pollset"); |
ab0ee2ca JG |
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); | |
a0377dfe | 343 | LTTNG_ASSERT(!ret); |
ab0ee2ca | 344 | ret = cds_lfht_destroy(state->client_socket_ht, NULL); |
a0377dfe | 345 | LTTNG_ASSERT(!ret); |
ab0ee2ca | 346 | } |
ac1889bf JG |
347 | if (state->client_id_ht) { |
348 | ret = cds_lfht_destroy(state->client_id_ht, NULL); | |
a0377dfe | 349 | LTTNG_ASSERT(!ret); |
ac1889bf | 350 | } |
ab0ee2ca JG |
351 | if (state->triggers_ht) { |
352 | ret = handle_notification_thread_trigger_unregister_all(state); | |
a0377dfe | 353 | LTTNG_ASSERT(!ret); |
ab0ee2ca | 354 | ret = cds_lfht_destroy(state->triggers_ht, NULL); |
a0377dfe | 355 | LTTNG_ASSERT(!ret); |
ab0ee2ca JG |
356 | } |
357 | if (state->channel_triggers_ht) { | |
358 | ret = cds_lfht_destroy(state->channel_triggers_ht, NULL); | |
a0377dfe | 359 | LTTNG_ASSERT(!ret); |
ab0ee2ca JG |
360 | } |
361 | if (state->channel_state_ht) { | |
362 | ret = cds_lfht_destroy(state->channel_state_ht, NULL); | |
a0377dfe | 363 | LTTNG_ASSERT(!ret); |
ab0ee2ca JG |
364 | } |
365 | if (state->notification_trigger_clients_ht) { | |
366 | ret = cds_lfht_destroy(state->notification_trigger_clients_ht, | |
367 | NULL); | |
a0377dfe | 368 | LTTNG_ASSERT(!ret); |
ab0ee2ca JG |
369 | } |
370 | if (state->channels_ht) { | |
8abe313a | 371 | ret = cds_lfht_destroy(state->channels_ht, NULL); |
a0377dfe | 372 | LTTNG_ASSERT(!ret); |
8abe313a JG |
373 | } |
374 | if (state->sessions_ht) { | |
375 | ret = cds_lfht_destroy(state->sessions_ht, NULL); | |
a0377dfe | 376 | LTTNG_ASSERT(!ret); |
ab0ee2ca | 377 | } |
242388e4 JR |
378 | if (state->triggers_by_name_uid_ht) { |
379 | ret = cds_lfht_destroy(state->triggers_by_name_uid_ht, NULL); | |
a0377dfe | 380 | LTTNG_ASSERT(!ret); |
242388e4 | 381 | } |
e7c93cf9 JR |
382 | if (state->trigger_tokens_ht) { |
383 | ret = cds_lfht_destroy(state->trigger_tokens_ht, NULL); | |
a0377dfe | 384 | LTTNG_ASSERT(!ret); |
e7c93cf9 | 385 | } |
ea9a44f0 JG |
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); | |
a0377dfe | 392 | LTTNG_ASSERT(!ret); |
ea9a44f0 | 393 | } |
ab0ee2ca JG |
394 | if (state->notification_channel_socket >= 0) { |
395 | notification_channel_socket_destroy( | |
396 | state->notification_channel_socket); | |
397 | } | |
d02d7404 | 398 | |
a0377dfe | 399 | LTTNG_ASSERT(cds_list_empty(&state->tracer_event_sources_list)); |
d02d7404 | 400 | |
f2b3ef9f JG |
401 | if (state->executor) { |
402 | action_executor_destroy(state->executor); | |
403 | } | |
ab0ee2ca JG |
404 | lttng_poll_clean(&state->events); |
405 | } | |
406 | ||
c8a9de5a JG |
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 | ||
ab0ee2ca JG |
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; | |
e6887944 | 430 | state->trigger_id.next_tracer_token = 1; |
ab0ee2ca JG |
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 | ||
bd0514a5 | 445 | DBG("Listening on notification channel socket"); |
ab0ee2ca JG |
446 | ret = lttcomm_listen_unix_sock(state->notification_channel_socket); |
447 | if (ret < 0) { | |
bd0514a5 | 448 | ERR("Listen failed on notification channel socket"); |
ab0ee2ca JG |
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 | ||
ac1889bf JG |
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 | ||
ab0ee2ca JG |
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 | ||
ea9a44f0 JG |
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 | ||
ab0ee2ca JG |
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 | } | |
8abe313a JG |
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 | } | |
ab0ee2ca JG |
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; | |
f2b3ef9f | 502 | } |
242388e4 JR |
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 | } | |
f2b3ef9f | 508 | |
e7c93cf9 JR |
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 | ||
d02d7404 JR |
515 | CDS_INIT_LIST_HEAD(&state->tracer_event_sources_list); |
516 | ||
f2b3ef9f JG |
517 | state->executor = action_executor_create(handle); |
518 | if (!state->executor) { | |
519 | goto error; | |
ab0ee2ca | 520 | } |
8b524060 FD |
521 | |
522 | state->restart_poll = false; | |
523 | ||
c8a9de5a | 524 | mark_thread_as_ready(handle); |
ab0ee2ca JG |
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) { | |
bd0514a5 | 552 | ERR("Failed to remove consumer monitoring pipe from poll set"); |
ab0ee2ca JG |
553 | } |
554 | goto end; | |
555 | } | |
556 | ||
557 | ret = handle_notification_thread_channel_sample( | |
558 | state, fd, domain); | |
559 | if (ret) { | |
bd0514a5 | 560 | ERR("Consumer sample handling error occurred"); |
ab0ee2ca JG |
561 | ret = -1; |
562 | goto end; | |
563 | } | |
564 | end: | |
565 | return ret; | |
566 | } | |
567 | ||
94078603 JR |
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)) { | |
34bf4f69 | 576 | ret = handle_notification_thread_tracer_event_source_died( |
94078603 JR |
577 | state, event_source_fd); |
578 | if (ret) { | |
bd0514a5 | 579 | ERR("Failed to remove event notification pipe from poll set: fd = %d", |
94078603 JR |
580 | event_source_fd); |
581 | } | |
582 | goto end; | |
583 | } | |
584 | ||
38eb8a68 FD |
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 | ||
94078603 JR |
596 | ret = handle_notification_thread_event_notification( |
597 | state, event_source_fd, domain); | |
598 | if (ret) { | |
bd0514a5 | 599 | ERR("Event notification handling error occurred for fd: %d", |
94078603 JR |
600 | event_source_fd); |
601 | ret = -1; | |
602 | goto end; | |
603 | } | |
38eb8a68 | 604 | |
94078603 JR |
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 | ||
a0377dfe | 618 | LTTNG_ASSERT(domain); |
94078603 JR |
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 | ||
ab0ee2ca JG |
633 | /* |
634 | * This thread services notification channel clients and commands received | |
635 | * from various lttng-sessiond components over a command queue. | |
636 | */ | |
c8a9de5a | 637 | static |
ab0ee2ca JG |
638 | void *thread_notification(void *data) |
639 | { | |
640 | int ret; | |
7966af57 | 641 | struct notification_thread_handle *handle = (notification_thread_handle *) data; |
ab0ee2ca | 642 | struct notification_thread_state state; |
94078603 | 643 | enum lttng_domain_type domain; |
ab0ee2ca | 644 | |
bd0514a5 | 645 | DBG("Started notification thread"); |
ab0ee2ca | 646 | |
412d7227 | 647 | health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_NOTIFICATION); |
f620cc28 JG |
648 | rcu_register_thread(); |
649 | rcu_thread_online(); | |
650 | ||
ab0ee2ca | 651 | if (!handle) { |
bd0514a5 | 652 | ERR("Invalid thread context provided"); |
ab0ee2ca JG |
653 | goto end; |
654 | } | |
655 | ||
ab0ee2ca JG |
656 | health_code_update(); |
657 | ||
658 | ret = init_thread_state(handle, &state); | |
659 | if (ret) { | |
660 | goto end; | |
661 | } | |
662 | ||
38eb8a68 FD |
663 | if (testpoint(sessiond_thread_notification)) { |
664 | goto end; | |
665 | } | |
666 | ||
ab0ee2ca JG |
667 | while (true) { |
668 | int fd_count, i; | |
669 | ||
670 | health_poll_entry(); | |
bd0514a5 | 671 | DBG("Entering poll wait"); |
ab0ee2ca | 672 | ret = lttng_poll_wait(&state.events, -1); |
bd0514a5 | 673 | DBG("Poll wait returned (%i)", ret); |
ab0ee2ca JG |
674 | health_poll_exit(); |
675 | if (ret < 0) { | |
676 | /* | |
677 | * Restart interrupted system call. | |
678 | */ | |
679 | if (errno == EINTR) { | |
680 | continue; | |
681 | } | |
bd0514a5 | 682 | ERR("Error encountered during lttng_poll_wait (%i)", ret); |
ab0ee2ca JG |
683 | goto error; |
684 | } | |
685 | ||
8b524060 FD |
686 | /* |
687 | * Reset restart_poll flag so that calls below might turn it | |
688 | * on. | |
689 | */ | |
690 | state.restart_poll = false; | |
691 | ||
ab0ee2ca JG |
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 | ||
bd0514a5 | 697 | DBG("Handling fd (%i) activity (%u)", fd, revents); |
ab0ee2ca JG |
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)) { | |
bd0514a5 | 708 | ERR("Notification socket poll error"); |
ab0ee2ca JG |
709 | goto error; |
710 | } else { | |
bd0514a5 | 711 | ERR("Unexpected poll events %u for notification socket %i", revents, fd); |
ab0ee2ca JG |
712 | goto error; |
713 | } | |
814b4934 | 714 | } else if (fd == lttng_pipe_get_readfd(handle->cmd_queue.event_pipe)) { |
ab0ee2ca JG |
715 | ret = handle_notification_thread_command(handle, |
716 | &state); | |
717 | if (ret < 0) { | |
bd0514a5 | 718 | DBG("Error encountered while servicing command queue"); |
ab0ee2ca JG |
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 | } | |
94078603 JR |
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 | } | |
ab0ee2ca JG |
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 | } | |
8b524060 FD |
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 | } | |
ab0ee2ca JG |
778 | } |
779 | } | |
780 | exit: | |
781 | error: | |
782 | fini_thread_state(&state); | |
f620cc28 | 783 | end: |
ab0ee2ca JG |
784 | rcu_thread_offline(); |
785 | rcu_unregister_thread(); | |
412d7227 | 786 | health_unregister(the_health_sessiond); |
ab0ee2ca JG |
787 | return NULL; |
788 | } | |
c8a9de5a JG |
789 | |
790 | static | |
791 | bool shutdown_notification_thread(void *thread_data) | |
792 | { | |
7966af57 | 793 | struct notification_thread_handle *handle = (notification_thread_handle *) thread_data; |
c8a9de5a JG |
794 | |
795 | notification_thread_command_quit(handle); | |
796 | return true; | |
797 | } | |
798 | ||
4a91420c JG |
799 | struct lttng_thread *launch_notification_thread( |
800 | struct notification_thread_handle *handle) | |
c8a9de5a JG |
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); | |
4a91420c | 819 | return thread; |
c8a9de5a | 820 | error: |
4a91420c | 821 | return NULL; |
c8a9de5a | 822 | } |