Commit | Line | Data |
---|---|---|
4ec029ed | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa MJ |
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 | ||
c9e313bc SM |
12 | #include <common/pipe.hpp> |
13 | #include <common/utils.hpp> | |
14 | ||
15 | #include "manage-consumer.hpp" | |
16 | #include "testpoint.hpp" | |
17 | #include "health-sessiond.hpp" | |
18 | #include "utils.hpp" | |
19 | #include "thread.hpp" | |
20 | #include "ust-consumer.hpp" | |
4ec029ed | 21 | |
f1494934 | 22 | namespace { |
4ec029ed JG |
23 | struct thread_notifiers { |
24 | struct lttng_pipe *quit_pipe; | |
25 | struct consumer_data *consumer_data; | |
52c50f8f | 26 | sem_t ready; |
4ec029ed JG |
27 | int initialization_result; |
28 | }; | |
f1494934 | 29 | } /* namespace */ |
4ec029ed JG |
30 | |
31 | static void mark_thread_as_ready(struct thread_notifiers *notifiers) | |
32 | { | |
33 | DBG("Marking consumer management thread as ready"); | |
34 | notifiers->initialization_result = 0; | |
35 | sem_post(¬ifiers->ready); | |
36 | } | |
37 | ||
38 | static void mark_thread_intialization_as_failed( | |
39 | struct thread_notifiers *notifiers) | |
40 | { | |
52c50f8f | 41 | ERR("Consumer management thread entering error state"); |
4ec029ed JG |
42 | notifiers->initialization_result = -1; |
43 | sem_post(¬ifiers->ready); | |
44 | } | |
45 | ||
46 | static void wait_until_thread_is_ready(struct thread_notifiers *notifiers) | |
47 | { | |
48 | DBG("Waiting for consumer management thread to be ready"); | |
49 | sem_wait(¬ifiers->ready); | |
50 | DBG("Consumer management thread is ready"); | |
51 | } | |
52 | ||
53 | /* | |
54 | * This thread manage the consumer error sent back to the session daemon. | |
55 | */ | |
0e0b3d3a | 56 | static void *thread_consumer_management(void *data) |
4ec029ed | 57 | { |
8a00688e MJ |
58 | int sock = -1, i, ret, err = -1, should_quit = 0; |
59 | uint32_t nb_fd; | |
4ec029ed JG |
60 | enum lttcomm_return_code code; |
61 | struct lttng_poll_event events; | |
7966af57 | 62 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
4ec029ed | 63 | struct consumer_data *consumer_data = notifiers->consumer_data; |
8a00688e | 64 | const auto thread_quit_pipe_fd = lttng_pipe_get_readfd(notifiers->quit_pipe); |
4ec029ed JG |
65 | struct consumer_socket *cmd_socket_wrapper = NULL; |
66 | ||
67 | DBG("[thread] Manage consumer started"); | |
68 | ||
69 | rcu_register_thread(); | |
70 | rcu_thread_online(); | |
71 | ||
412d7227 | 72 | health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
4ec029ed JG |
73 | |
74 | health_code_update(); | |
75 | ||
76 | /* | |
77 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the | |
78 | * metadata_sock. Nothing more will be added to this poll set. | |
79 | */ | |
80 | ret = lttng_poll_create(&events, 3, LTTNG_CLOEXEC); | |
81 | if (ret < 0) { | |
82 | mark_thread_intialization_as_failed(notifiers); | |
83 | goto error_poll; | |
84 | } | |
85 | ||
1524f98c | 86 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN); |
4ec029ed JG |
87 | if (ret < 0) { |
88 | mark_thread_intialization_as_failed(notifiers); | |
89 | goto error; | |
90 | } | |
91 | ||
92 | /* | |
93 | * The error socket here is already in a listening state which was done | |
94 | * just before spawning this thread to avoid a race between the consumer | |
95 | * daemon exec trying to connect and the listen() call. | |
96 | */ | |
97 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); | |
98 | if (ret < 0) { | |
99 | mark_thread_intialization_as_failed(notifiers); | |
100 | goto error; | |
101 | } | |
102 | ||
103 | health_code_update(); | |
104 | ||
105 | /* Infinite blocking call, waiting for transmission */ | |
106 | health_poll_entry(); | |
107 | ||
108 | if (testpoint(sessiond_thread_manage_consumer)) { | |
109 | mark_thread_intialization_as_failed(notifiers); | |
110 | goto error; | |
111 | } | |
112 | ||
113 | ret = lttng_poll_wait(&events, -1); | |
114 | health_poll_exit(); | |
115 | if (ret < 0) { | |
116 | mark_thread_intialization_as_failed(notifiers); | |
117 | goto error; | |
118 | } | |
119 | ||
120 | nb_fd = ret; | |
121 | ||
122 | for (i = 0; i < nb_fd; i++) { | |
123 | /* Fetch once the poll data */ | |
8a00688e MJ |
124 | const auto revents = LTTNG_POLL_GETEV(&events, i); |
125 | const auto pollfd = LTTNG_POLL_GETFD(&events, i); | |
4ec029ed JG |
126 | |
127 | health_code_update(); | |
128 | ||
8a00688e MJ |
129 | /* Activity on thread quit pipe, exiting. */ |
130 | if (pollfd == thread_quit_pipe_fd) { | |
131 | DBG("Activity on thread quit pipe"); | |
4ec029ed JG |
132 | err = 0; |
133 | mark_thread_intialization_as_failed(notifiers); | |
134 | goto exit; | |
135 | } else if (pollfd == consumer_data->err_sock) { | |
136 | /* Event on the registration socket */ | |
137 | if (revents & LPOLLIN) { | |
138 | continue; | |
139 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
140 | ERR("consumer err socket poll error"); | |
141 | mark_thread_intialization_as_failed(notifiers); | |
142 | goto error; | |
143 | } else { | |
144 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
145 | mark_thread_intialization_as_failed(notifiers); | |
146 | goto error; | |
147 | } | |
148 | } | |
149 | } | |
150 | ||
151 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); | |
152 | if (sock < 0) { | |
153 | mark_thread_intialization_as_failed(notifiers); | |
154 | goto error; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
159 | * show must go on. | |
160 | */ | |
161 | (void) utils_set_fd_cloexec(sock); | |
162 | ||
163 | health_code_update(); | |
164 | ||
165 | DBG2("Receiving code from consumer err_sock"); | |
166 | ||
167 | /* Getting status code from kconsumerd */ | |
168 | ret = lttcomm_recv_unix_sock(sock, &code, | |
169 | sizeof(enum lttcomm_return_code)); | |
170 | if (ret <= 0) { | |
171 | mark_thread_intialization_as_failed(notifiers); | |
172 | goto error; | |
173 | } | |
174 | ||
175 | health_code_update(); | |
176 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { | |
177 | ERR("consumer error when waiting for SOCK_READY : %s", | |
7966af57 | 178 | lttcomm_get_readable_code((lttcomm_return_code) -code)); |
4ec029ed JG |
179 | mark_thread_intialization_as_failed(notifiers); |
180 | goto error; | |
181 | } | |
182 | ||
183 | /* Connect both command and metadata sockets. */ | |
184 | consumer_data->cmd_sock = | |
185 | lttcomm_connect_unix_sock( | |
186 | consumer_data->cmd_unix_sock_path); | |
187 | consumer_data->metadata_fd = | |
188 | lttcomm_connect_unix_sock( | |
189 | consumer_data->cmd_unix_sock_path); | |
190 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { | |
191 | PERROR("consumer connect cmd socket"); | |
192 | mark_thread_intialization_as_failed(notifiers); | |
193 | goto error; | |
194 | } | |
195 | ||
196 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; | |
197 | ||
198 | /* Create metadata socket lock. */ | |
64803277 | 199 | consumer_data->metadata_sock.lock = zmalloc<pthread_mutex_t>(); |
4ec029ed JG |
200 | if (consumer_data->metadata_sock.lock == NULL) { |
201 | PERROR("zmalloc pthread mutex"); | |
202 | mark_thread_intialization_as_failed(notifiers); | |
203 | goto error; | |
204 | } | |
205 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); | |
206 | ||
207 | DBG("Consumer command socket ready (fd: %d)", consumer_data->cmd_sock); | |
208 | DBG("Consumer metadata socket ready (fd: %d)", | |
209 | consumer_data->metadata_fd); | |
210 | ||
211 | /* | |
212 | * Remove the consumerd error sock since we've established a connection. | |
213 | */ | |
214 | ret = lttng_poll_del(&events, consumer_data->err_sock); | |
215 | if (ret < 0) { | |
216 | mark_thread_intialization_as_failed(notifiers); | |
217 | goto error; | |
218 | } | |
219 | ||
220 | /* Add new accepted error socket. */ | |
221 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); | |
222 | if (ret < 0) { | |
223 | mark_thread_intialization_as_failed(notifiers); | |
224 | goto error; | |
225 | } | |
226 | ||
227 | /* Add metadata socket that is successfully connected. */ | |
228 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, | |
229 | LPOLLIN | LPOLLRDHUP); | |
230 | if (ret < 0) { | |
231 | mark_thread_intialization_as_failed(notifiers); | |
232 | goto error; | |
233 | } | |
234 | ||
235 | health_code_update(); | |
236 | ||
237 | /* | |
09ede842 JG |
238 | * Transfer the write-end of the channel monitoring pipe to the consumer |
239 | * by issuing a SET_CHANNEL_MONITOR_PIPE command. | |
4ec029ed JG |
240 | */ |
241 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); | |
242 | if (!cmd_socket_wrapper) { | |
243 | mark_thread_intialization_as_failed(notifiers); | |
244 | goto error; | |
245 | } | |
246 | cmd_socket_wrapper->lock = &consumer_data->lock; | |
247 | ||
09ede842 | 248 | pthread_mutex_lock(cmd_socket_wrapper->lock); |
412d7227 | 249 | ret = consumer_init(cmd_socket_wrapper, the_sessiond_uuid); |
09ede842 JG |
250 | if (ret) { |
251 | ERR("Failed to send sessiond uuid to consumer daemon"); | |
252 | mark_thread_intialization_as_failed(notifiers); | |
253 | pthread_mutex_unlock(cmd_socket_wrapper->lock); | |
254 | goto error; | |
255 | } | |
256 | pthread_mutex_unlock(cmd_socket_wrapper->lock); | |
257 | ||
4ec029ed JG |
258 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, |
259 | consumer_data->channel_monitor_pipe); | |
260 | if (ret) { | |
261 | mark_thread_intialization_as_failed(notifiers); | |
262 | goto error; | |
263 | } | |
264 | ||
265 | /* Discard the socket wrapper as it is no longer needed. */ | |
266 | consumer_destroy_socket(cmd_socket_wrapper); | |
267 | cmd_socket_wrapper = NULL; | |
268 | ||
269 | /* The thread is completely initialized, signal that it is ready. */ | |
270 | mark_thread_as_ready(notifiers); | |
271 | ||
272 | /* Infinite blocking call, waiting for transmission */ | |
273 | while (1) { | |
274 | health_code_update(); | |
275 | ||
276 | /* Exit the thread because the thread quit pipe has been triggered. */ | |
277 | if (should_quit) { | |
278 | /* Not a health error. */ | |
279 | err = 0; | |
280 | goto exit; | |
281 | } | |
282 | ||
283 | health_poll_entry(); | |
284 | ret = lttng_poll_wait(&events, -1); | |
285 | health_poll_exit(); | |
286 | if (ret < 0) { | |
287 | goto error; | |
288 | } | |
289 | ||
290 | nb_fd = ret; | |
291 | ||
292 | for (i = 0; i < nb_fd; i++) { | |
293 | /* Fetch once the poll data */ | |
8a00688e MJ |
294 | const auto revents = LTTNG_POLL_GETEV(&events, i); |
295 | const auto pollfd = LTTNG_POLL_GETFD(&events, i); | |
4ec029ed JG |
296 | |
297 | health_code_update(); | |
298 | ||
4ec029ed JG |
299 | /* |
300 | * Thread quit pipe has been triggered, flag that we should stop | |
301 | * but continue the current loop to handle potential data from | |
302 | * consumer. | |
303 | */ | |
8a00688e | 304 | if (pollfd == thread_quit_pipe_fd) { |
4ec029ed JG |
305 | should_quit = 1; |
306 | } else if (pollfd == sock) { | |
307 | /* Event on the consumerd socket */ | |
308 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) | |
309 | && !(revents & LPOLLIN)) { | |
310 | ERR("consumer err socket second poll error"); | |
311 | goto error; | |
312 | } | |
313 | health_code_update(); | |
314 | /* Wait for any kconsumerd error */ | |
315 | ret = lttcomm_recv_unix_sock(sock, &code, | |
316 | sizeof(enum lttcomm_return_code)); | |
317 | if (ret <= 0) { | |
318 | ERR("consumer closed the command socket"); | |
319 | goto error; | |
320 | } | |
321 | ||
322 | ERR("consumer return code : %s", | |
7966af57 | 323 | lttcomm_get_readable_code((lttcomm_return_code) -code)); |
4ec029ed JG |
324 | |
325 | goto exit; | |
326 | } else if (pollfd == consumer_data->metadata_fd) { | |
327 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) | |
328 | && !(revents & LPOLLIN)) { | |
329 | ERR("consumer err metadata socket second poll error"); | |
330 | goto error; | |
331 | } | |
332 | /* UST metadata requests */ | |
333 | ret = ust_consumer_metadata_request( | |
334 | &consumer_data->metadata_sock); | |
335 | if (ret < 0) { | |
336 | ERR("Handling metadata request"); | |
337 | goto error; | |
338 | } | |
339 | } | |
340 | /* No need for an else branch all FDs are tested prior. */ | |
341 | } | |
342 | health_code_update(); | |
343 | } | |
344 | ||
345 | exit: | |
346 | error: | |
347 | /* | |
348 | * We lock here because we are about to close the sockets and some other | |
349 | * thread might be using them so get exclusive access which will abort all | |
350 | * other consumer command by other threads. | |
351 | */ | |
352 | pthread_mutex_lock(&consumer_data->lock); | |
353 | ||
354 | /* Immediately set the consumerd state to stopped */ | |
355 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { | |
412d7227 | 356 | uatomic_set(&the_kernel_consumerd_state, CONSUMER_ERROR); |
4ec029ed JG |
357 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || |
358 | consumer_data->type == LTTNG_CONSUMER32_UST) { | |
412d7227 | 359 | uatomic_set(&the_ust_consumerd_state, CONSUMER_ERROR); |
4ec029ed JG |
360 | } else { |
361 | /* Code flow error... */ | |
a0377dfe | 362 | abort(); |
4ec029ed JG |
363 | } |
364 | ||
365 | if (consumer_data->err_sock >= 0) { | |
366 | ret = close(consumer_data->err_sock); | |
367 | if (ret) { | |
368 | PERROR("close"); | |
369 | } | |
370 | consumer_data->err_sock = -1; | |
371 | } | |
372 | if (consumer_data->cmd_sock >= 0) { | |
373 | ret = close(consumer_data->cmd_sock); | |
374 | if (ret) { | |
375 | PERROR("close"); | |
376 | } | |
377 | consumer_data->cmd_sock = -1; | |
378 | } | |
379 | if (consumer_data->metadata_sock.fd_ptr && | |
380 | *consumer_data->metadata_sock.fd_ptr >= 0) { | |
381 | ret = close(*consumer_data->metadata_sock.fd_ptr); | |
382 | if (ret) { | |
383 | PERROR("close"); | |
384 | } | |
385 | } | |
386 | if (sock >= 0) { | |
387 | ret = close(sock); | |
388 | if (ret) { | |
389 | PERROR("close"); | |
390 | } | |
391 | } | |
392 | ||
393 | unlink(consumer_data->err_unix_sock_path); | |
394 | unlink(consumer_data->cmd_unix_sock_path); | |
395 | pthread_mutex_unlock(&consumer_data->lock); | |
396 | ||
397 | /* Cleanup metadata socket mutex. */ | |
398 | if (consumer_data->metadata_sock.lock) { | |
399 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); | |
400 | free(consumer_data->metadata_sock.lock); | |
401 | } | |
402 | lttng_poll_clean(&events); | |
403 | ||
404 | if (cmd_socket_wrapper) { | |
405 | consumer_destroy_socket(cmd_socket_wrapper); | |
406 | } | |
407 | error_poll: | |
408 | if (err) { | |
409 | health_error(); | |
410 | ERR("Health error occurred in %s", __func__); | |
411 | } | |
412d7227 | 412 | health_unregister(the_health_sessiond); |
4ec029ed JG |
413 | DBG("consumer thread cleanup completed"); |
414 | ||
415 | rcu_thread_offline(); | |
416 | rcu_unregister_thread(); | |
417 | ||
418 | return NULL; | |
419 | } | |
420 | ||
421 | static bool shutdown_consumer_management_thread(void *data) | |
422 | { | |
7966af57 | 423 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
4ec029ed JG |
424 | const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); |
425 | ||
426 | return notify_thread_pipe(write_fd) == 1; | |
427 | } | |
428 | ||
429 | static void cleanup_consumer_management_thread(void *data) | |
430 | { | |
7966af57 | 431 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
4ec029ed JG |
432 | |
433 | lttng_pipe_destroy(notifiers->quit_pipe); | |
434 | free(notifiers); | |
435 | } | |
436 | ||
437 | bool launch_consumer_management_thread(struct consumer_data *consumer_data) | |
438 | { | |
439 | struct lttng_pipe *quit_pipe; | |
440 | struct thread_notifiers *notifiers = NULL; | |
441 | struct lttng_thread *thread; | |
442 | ||
64803277 | 443 | notifiers = zmalloc<thread_notifiers>(); |
4ec029ed | 444 | if (!notifiers) { |
21fa020e JG |
445 | goto error_alloc; |
446 | } | |
447 | ||
448 | quit_pipe = lttng_pipe_open(FD_CLOEXEC); | |
449 | if (!quit_pipe) { | |
4ec029ed JG |
450 | goto error; |
451 | } | |
452 | notifiers->quit_pipe = quit_pipe; | |
453 | notifiers->consumer_data = consumer_data; | |
454 | sem_init(¬ifiers->ready, 0, 0); | |
455 | ||
456 | thread = lttng_thread_create("Consumer management", | |
457 | thread_consumer_management, | |
458 | shutdown_consumer_management_thread, | |
459 | cleanup_consumer_management_thread, | |
460 | notifiers); | |
461 | if (!thread) { | |
462 | goto error; | |
463 | } | |
464 | wait_until_thread_is_ready(notifiers); | |
465 | lttng_thread_put(thread); | |
466 | if (notifiers->initialization_result) { | |
bd3739b0 | 467 | return false; |
4ec029ed JG |
468 | } |
469 | return true; | |
470 | error: | |
471 | cleanup_consumer_management_thread(notifiers); | |
21fa020e | 472 | error_alloc: |
4ec029ed JG |
473 | return false; |
474 | } |