Commit | Line | Data |
---|---|---|
4ec029ed | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
4ec029ed | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
4ec029ed | 7 | * |
4ec029ed JG |
8 | */ |
9 | ||
10 | #include <signal.h> | |
11 | ||
12 | #include <common/pipe.h> | |
13 | #include <common/utils.h> | |
14 | ||
15 | #include "manage-consumer.h" | |
16 | #include "testpoint.h" | |
17 | #include "health-sessiond.h" | |
18 | #include "utils.h" | |
19 | #include "thread.h" | |
20 | #include "ust-consumer.h" | |
21 | ||
22 | struct thread_notifiers { | |
23 | struct lttng_pipe *quit_pipe; | |
24 | struct consumer_data *consumer_data; | |
52c50f8f | 25 | sem_t ready; |
4ec029ed JG |
26 | int initialization_result; |
27 | }; | |
28 | ||
29 | static void mark_thread_as_ready(struct thread_notifiers *notifiers) | |
30 | { | |
31 | DBG("Marking consumer management thread as ready"); | |
32 | notifiers->initialization_result = 0; | |
33 | sem_post(¬ifiers->ready); | |
34 | } | |
35 | ||
36 | static void mark_thread_intialization_as_failed( | |
37 | struct thread_notifiers *notifiers) | |
38 | { | |
52c50f8f | 39 | ERR("Consumer management thread entering error state"); |
4ec029ed JG |
40 | notifiers->initialization_result = -1; |
41 | sem_post(¬ifiers->ready); | |
42 | } | |
43 | ||
44 | static void wait_until_thread_is_ready(struct thread_notifiers *notifiers) | |
45 | { | |
46 | DBG("Waiting for consumer management thread to be ready"); | |
47 | sem_wait(¬ifiers->ready); | |
48 | DBG("Consumer management thread is ready"); | |
49 | } | |
50 | ||
51 | /* | |
52 | * This thread manage the consumer error sent back to the session daemon. | |
53 | */ | |
0e0b3d3a | 54 | static void *thread_consumer_management(void *data) |
4ec029ed JG |
55 | { |
56 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; | |
57 | uint32_t revents, nb_fd; | |
58 | enum lttcomm_return_code code; | |
59 | struct lttng_poll_event events; | |
60 | struct thread_notifiers *notifiers = data; | |
61 | struct consumer_data *consumer_data = notifiers->consumer_data; | |
62 | const int quit_pipe_read_fd = lttng_pipe_get_readfd(notifiers->quit_pipe); | |
63 | struct consumer_socket *cmd_socket_wrapper = NULL; | |
64 | ||
65 | DBG("[thread] Manage consumer started"); | |
66 | ||
67 | rcu_register_thread(); | |
68 | rcu_thread_online(); | |
69 | ||
70 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); | |
71 | ||
72 | health_code_update(); | |
73 | ||
74 | /* | |
75 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the | |
76 | * metadata_sock. Nothing more will be added to this poll set. | |
77 | */ | |
78 | ret = lttng_poll_create(&events, 3, LTTNG_CLOEXEC); | |
79 | if (ret < 0) { | |
80 | mark_thread_intialization_as_failed(notifiers); | |
81 | goto error_poll; | |
82 | } | |
83 | ||
84 | ret = lttng_poll_add(&events, quit_pipe_read_fd, LPOLLIN | LPOLLERR); | |
85 | if (ret < 0) { | |
86 | mark_thread_intialization_as_failed(notifiers); | |
87 | goto error; | |
88 | } | |
89 | ||
90 | /* | |
91 | * The error socket here is already in a listening state which was done | |
92 | * just before spawning this thread to avoid a race between the consumer | |
93 | * daemon exec trying to connect and the listen() call. | |
94 | */ | |
95 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); | |
96 | if (ret < 0) { | |
97 | mark_thread_intialization_as_failed(notifiers); | |
98 | goto error; | |
99 | } | |
100 | ||
101 | health_code_update(); | |
102 | ||
103 | /* Infinite blocking call, waiting for transmission */ | |
104 | health_poll_entry(); | |
105 | ||
106 | if (testpoint(sessiond_thread_manage_consumer)) { | |
107 | mark_thread_intialization_as_failed(notifiers); | |
108 | goto error; | |
109 | } | |
110 | ||
111 | ret = lttng_poll_wait(&events, -1); | |
112 | health_poll_exit(); | |
113 | if (ret < 0) { | |
114 | mark_thread_intialization_as_failed(notifiers); | |
115 | goto error; | |
116 | } | |
117 | ||
118 | nb_fd = ret; | |
119 | ||
120 | for (i = 0; i < nb_fd; i++) { | |
121 | /* Fetch once the poll data */ | |
122 | revents = LTTNG_POLL_GETEV(&events, i); | |
123 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
124 | ||
125 | health_code_update(); | |
126 | ||
4ec029ed JG |
127 | /* Thread quit pipe has been closed. Killing thread. */ |
128 | if (pollfd == quit_pipe_read_fd) { | |
129 | err = 0; | |
130 | mark_thread_intialization_as_failed(notifiers); | |
131 | goto exit; | |
132 | } else if (pollfd == consumer_data->err_sock) { | |
133 | /* Event on the registration socket */ | |
134 | if (revents & LPOLLIN) { | |
135 | continue; | |
136 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
137 | ERR("consumer err socket poll error"); | |
138 | mark_thread_intialization_as_failed(notifiers); | |
139 | goto error; | |
140 | } else { | |
141 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
142 | mark_thread_intialization_as_failed(notifiers); | |
143 | goto error; | |
144 | } | |
145 | } | |
146 | } | |
147 | ||
148 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); | |
149 | if (sock < 0) { | |
150 | mark_thread_intialization_as_failed(notifiers); | |
151 | goto error; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
156 | * show must go on. | |
157 | */ | |
158 | (void) utils_set_fd_cloexec(sock); | |
159 | ||
160 | health_code_update(); | |
161 | ||
162 | DBG2("Receiving code from consumer err_sock"); | |
163 | ||
164 | /* Getting status code from kconsumerd */ | |
165 | ret = lttcomm_recv_unix_sock(sock, &code, | |
166 | sizeof(enum lttcomm_return_code)); | |
167 | if (ret <= 0) { | |
168 | mark_thread_intialization_as_failed(notifiers); | |
169 | goto error; | |
170 | } | |
171 | ||
172 | health_code_update(); | |
173 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { | |
174 | ERR("consumer error when waiting for SOCK_READY : %s", | |
175 | lttcomm_get_readable_code(-code)); | |
176 | mark_thread_intialization_as_failed(notifiers); | |
177 | goto error; | |
178 | } | |
179 | ||
180 | /* Connect both command and metadata sockets. */ | |
181 | consumer_data->cmd_sock = | |
182 | lttcomm_connect_unix_sock( | |
183 | consumer_data->cmd_unix_sock_path); | |
184 | consumer_data->metadata_fd = | |
185 | lttcomm_connect_unix_sock( | |
186 | consumer_data->cmd_unix_sock_path); | |
187 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { | |
188 | PERROR("consumer connect cmd socket"); | |
189 | mark_thread_intialization_as_failed(notifiers); | |
190 | goto error; | |
191 | } | |
192 | ||
193 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; | |
194 | ||
195 | /* Create metadata socket lock. */ | |
196 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); | |
197 | if (consumer_data->metadata_sock.lock == NULL) { | |
198 | PERROR("zmalloc pthread mutex"); | |
199 | mark_thread_intialization_as_failed(notifiers); | |
200 | goto error; | |
201 | } | |
202 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
203 | ||
204 | DBG("Consumer command socket ready (fd: %d)", consumer_data->cmd_sock); | |
205 | DBG("Consumer metadata socket ready (fd: %d)", | |
206 | consumer_data->metadata_fd); | |
207 | ||
208 | /* | |
209 | * Remove the consumerd error sock since we've established a connection. | |
210 | */ | |
211 | ret = lttng_poll_del(&events, consumer_data->err_sock); | |
212 | if (ret < 0) { | |
213 | mark_thread_intialization_as_failed(notifiers); | |
214 | goto error; | |
215 | } | |
216 | ||
217 | /* Add new accepted error socket. */ | |
218 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); | |
219 | if (ret < 0) { | |
220 | mark_thread_intialization_as_failed(notifiers); | |
221 | goto error; | |
222 | } | |
223 | ||
224 | /* Add metadata socket that is successfully connected. */ | |
225 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, | |
226 | LPOLLIN | LPOLLRDHUP); | |
227 | if (ret < 0) { | |
228 | mark_thread_intialization_as_failed(notifiers); | |
229 | goto error; | |
230 | } | |
231 | ||
232 | health_code_update(); | |
233 | ||
234 | /* | |
09ede842 JG |
235 | * Transfer the write-end of the channel monitoring pipe to the consumer |
236 | * by issuing a SET_CHANNEL_MONITOR_PIPE command. | |
4ec029ed JG |
237 | */ |
238 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); | |
239 | if (!cmd_socket_wrapper) { | |
240 | mark_thread_intialization_as_failed(notifiers); | |
241 | goto error; | |
242 | } | |
243 | cmd_socket_wrapper->lock = &consumer_data->lock; | |
244 | ||
09ede842 JG |
245 | pthread_mutex_lock(cmd_socket_wrapper->lock); |
246 | ret = consumer_init(cmd_socket_wrapper, sessiond_uuid); | |
247 | if (ret) { | |
248 | ERR("Failed to send sessiond uuid to consumer daemon"); | |
249 | mark_thread_intialization_as_failed(notifiers); | |
250 | pthread_mutex_unlock(cmd_socket_wrapper->lock); | |
251 | goto error; | |
252 | } | |
253 | pthread_mutex_unlock(cmd_socket_wrapper->lock); | |
254 | ||
4ec029ed JG |
255 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, |
256 | consumer_data->channel_monitor_pipe); | |
257 | if (ret) { | |
258 | mark_thread_intialization_as_failed(notifiers); | |
259 | goto error; | |
260 | } | |
261 | ||
262 | /* Discard the socket wrapper as it is no longer needed. */ | |
263 | consumer_destroy_socket(cmd_socket_wrapper); | |
264 | cmd_socket_wrapper = NULL; | |
265 | ||
266 | /* The thread is completely initialized, signal that it is ready. */ | |
267 | mark_thread_as_ready(notifiers); | |
268 | ||
269 | /* Infinite blocking call, waiting for transmission */ | |
270 | while (1) { | |
271 | health_code_update(); | |
272 | ||
273 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
274 | if (should_quit) { | |
275 | /* Not a health error. */ | |
276 | err = 0; | |
277 | goto exit; | |
278 | } | |
279 | ||
280 | health_poll_entry(); | |
281 | ret = lttng_poll_wait(&events, -1); | |
282 | health_poll_exit(); | |
283 | if (ret < 0) { | |
284 | goto error; | |
285 | } | |
286 | ||
287 | nb_fd = ret; | |
288 | ||
289 | for (i = 0; i < nb_fd; i++) { | |
290 | /* Fetch once the poll data */ | |
291 | revents = LTTNG_POLL_GETEV(&events, i); | |
292 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
293 | ||
294 | health_code_update(); | |
295 | ||
4ec029ed JG |
296 | /* |
297 | * Thread quit pipe has been triggered, flag that we should stop | |
298 | * but continue the current loop to handle potential data from | |
299 | * consumer. | |
300 | */ | |
301 | if (pollfd == quit_pipe_read_fd) { | |
302 | should_quit = 1; | |
303 | } else if (pollfd == sock) { | |
304 | /* Event on the consumerd socket */ | |
305 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) | |
306 | && !(revents & LPOLLIN)) { | |
307 | ERR("consumer err socket second poll error"); | |
308 | goto error; | |
309 | } | |
310 | health_code_update(); | |
311 | /* Wait for any kconsumerd error */ | |
312 | ret = lttcomm_recv_unix_sock(sock, &code, | |
313 | sizeof(enum lttcomm_return_code)); | |
314 | if (ret <= 0) { | |
315 | ERR("consumer closed the command socket"); | |
316 | goto error; | |
317 | } | |
318 | ||
319 | ERR("consumer return code : %s", | |
320 | lttcomm_get_readable_code(-code)); | |
321 | ||
322 | goto exit; | |
323 | } else if (pollfd == consumer_data->metadata_fd) { | |
324 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) | |
325 | && !(revents & LPOLLIN)) { | |
326 | ERR("consumer err metadata socket second poll error"); | |
327 | goto error; | |
328 | } | |
329 | /* UST metadata requests */ | |
330 | ret = ust_consumer_metadata_request( | |
331 | &consumer_data->metadata_sock); | |
332 | if (ret < 0) { | |
333 | ERR("Handling metadata request"); | |
334 | goto error; | |
335 | } | |
336 | } | |
337 | /* No need for an else branch all FDs are tested prior. */ | |
338 | } | |
339 | health_code_update(); | |
340 | } | |
341 | ||
342 | exit: | |
343 | error: | |
344 | /* | |
345 | * We lock here because we are about to close the sockets and some other | |
346 | * thread might be using them so get exclusive access which will abort all | |
347 | * other consumer command by other threads. | |
348 | */ | |
349 | pthread_mutex_lock(&consumer_data->lock); | |
350 | ||
351 | /* Immediately set the consumerd state to stopped */ | |
352 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
353 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); | |
354 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || | |
355 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
356 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); | |
357 | } else { | |
358 | /* Code flow error... */ | |
359 | assert(0); | |
360 | } | |
361 | ||
362 | if (consumer_data->err_sock >= 0) { | |
363 | ret = close(consumer_data->err_sock); | |
364 | if (ret) { | |
365 | PERROR("close"); | |
366 | } | |
367 | consumer_data->err_sock = -1; | |
368 | } | |
369 | if (consumer_data->cmd_sock >= 0) { | |
370 | ret = close(consumer_data->cmd_sock); | |
371 | if (ret) { | |
372 | PERROR("close"); | |
373 | } | |
374 | consumer_data->cmd_sock = -1; | |
375 | } | |
376 | if (consumer_data->metadata_sock.fd_ptr && | |
377 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
378 | ret = close(*consumer_data->metadata_sock.fd_ptr); | |
379 | if (ret) { | |
380 | PERROR("close"); | |
381 | } | |
382 | } | |
383 | if (sock >= 0) { | |
384 | ret = close(sock); | |
385 | if (ret) { | |
386 | PERROR("close"); | |
387 | } | |
388 | } | |
389 | ||
390 | unlink(consumer_data->err_unix_sock_path); | |
391 | unlink(consumer_data->cmd_unix_sock_path); | |
392 | pthread_mutex_unlock(&consumer_data->lock); | |
393 | ||
394 | /* Cleanup metadata socket mutex. */ | |
395 | if (consumer_data->metadata_sock.lock) { | |
396 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
397 | free(consumer_data->metadata_sock.lock); | |
398 | } | |
399 | lttng_poll_clean(&events); | |
400 | ||
401 | if (cmd_socket_wrapper) { | |
402 | consumer_destroy_socket(cmd_socket_wrapper); | |
403 | } | |
404 | error_poll: | |
405 | if (err) { | |
406 | health_error(); | |
407 | ERR("Health error occurred in %s", __func__); | |
408 | } | |
409 | health_unregister(health_sessiond); | |
410 | DBG("consumer thread cleanup completed"); | |
411 | ||
412 | rcu_thread_offline(); | |
413 | rcu_unregister_thread(); | |
414 | ||
415 | return NULL; | |
416 | } | |
417 | ||
418 | static bool shutdown_consumer_management_thread(void *data) | |
419 | { | |
420 | struct thread_notifiers *notifiers = data; | |
421 | const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); | |
422 | ||
423 | return notify_thread_pipe(write_fd) == 1; | |
424 | } | |
425 | ||
426 | static void cleanup_consumer_management_thread(void *data) | |
427 | { | |
428 | struct thread_notifiers *notifiers = data; | |
429 | ||
430 | lttng_pipe_destroy(notifiers->quit_pipe); | |
431 | free(notifiers); | |
432 | } | |
433 | ||
434 | bool launch_consumer_management_thread(struct consumer_data *consumer_data) | |
435 | { | |
436 | struct lttng_pipe *quit_pipe; | |
437 | struct thread_notifiers *notifiers = NULL; | |
438 | struct lttng_thread *thread; | |
439 | ||
4ec029ed JG |
440 | notifiers = zmalloc(sizeof(*notifiers)); |
441 | if (!notifiers) { | |
21fa020e JG |
442 | goto error_alloc; |
443 | } | |
444 | ||
445 | quit_pipe = lttng_pipe_open(FD_CLOEXEC); | |
446 | if (!quit_pipe) { | |
4ec029ed JG |
447 | goto error; |
448 | } | |
449 | notifiers->quit_pipe = quit_pipe; | |
450 | notifiers->consumer_data = consumer_data; | |
451 | sem_init(¬ifiers->ready, 0, 0); | |
452 | ||
453 | thread = lttng_thread_create("Consumer management", | |
454 | thread_consumer_management, | |
455 | shutdown_consumer_management_thread, | |
456 | cleanup_consumer_management_thread, | |
457 | notifiers); | |
458 | if (!thread) { | |
459 | goto error; | |
460 | } | |
461 | wait_until_thread_is_ready(notifiers); | |
462 | lttng_thread_put(thread); | |
463 | if (notifiers->initialization_result) { | |
bd3739b0 | 464 | return false; |
4ec029ed JG |
465 | } |
466 | return true; | |
467 | error: | |
468 | cleanup_consumer_management_thread(notifiers); | |
21fa020e | 469 | error_alloc: |
4ec029ed JG |
470 | return false; |
471 | } |