Commit | Line | Data |
---|---|---|
4d076222 | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
4d076222 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
4d076222 | 5 | * |
4d076222 DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
4d076222 DG |
9 | |
10 | #include <common/common.h> | |
11 | #include <common/sessiond-comm/sessiond-comm.h> | |
12 | #include <common/uri.h> | |
13 | #include <common/utils.h> | |
14 | ||
f263b7fd JD |
15 | #include <common/compat/endian.h> |
16 | ||
4d076222 | 17 | #include "fd-limit.h" |
022d91ba | 18 | #include "agent-thread.h" |
6a4e4039 | 19 | #include "agent.h" |
4d076222 | 20 | #include "lttng-sessiond.h" |
f20baf8e DG |
21 | #include "session.h" |
22 | #include "utils.h" | |
8a7e4590 | 23 | #include "thread.h" |
4d076222 | 24 | |
c78d8e86 JG |
25 | struct thread_notifiers { |
26 | struct lttng_pipe *quit_pipe; | |
27 | sem_t ready; | |
28 | }; | |
29 | ||
733c9165 JG |
30 | struct agent_app_id { |
31 | pid_t pid; | |
32 | enum lttng_domain_type domain; | |
33 | }; | |
34 | ||
35 | struct agent_protocol_version { | |
36 | unsigned int major, minor; | |
37 | }; | |
38 | ||
f28f9e44 JG |
39 | static int agent_tracing_enabled = -1; |
40 | ||
4d076222 DG |
41 | /* |
42 | * Note that there is not port here. It's set after this URI is parsed so we | |
43 | * can let the user define a custom one. However, localhost is ALWAYS the | |
44 | * default listening address. | |
45 | */ | |
fa91dc52 MD |
46 | static const char *default_reg_uri = |
47 | "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS; | |
4d076222 | 48 | |
f20baf8e | 49 | /* |
022d91ba | 50 | * Update agent application using the given socket. This is done just after |
f20baf8e DG |
51 | * registration was successful. |
52 | * | |
733c9165 JG |
53 | * This will acquire the various sessions' lock; none must be held by the |
54 | * caller. | |
55 | * The caller must hold the session list lock. | |
f20baf8e | 56 | */ |
733c9165 | 57 | static void update_agent_app(const struct agent_app *app) |
f20baf8e DG |
58 | { |
59 | struct ltt_session *session, *stmp; | |
60 | struct ltt_session_list *list; | |
44760c20 JR |
61 | struct agent *trigger_agent; |
62 | struct lttng_ht_iter iter; | |
f20baf8e DG |
63 | |
64 | list = session_get_list(); | |
a0377dfe | 65 | LTTNG_ASSERT(list); |
f20baf8e | 66 | |
f20baf8e | 67 | cds_list_for_each_entry_safe(session, stmp, &list->head, list) { |
e32d7f27 JG |
68 | if (!session_get(session)) { |
69 | continue; | |
70 | } | |
71 | ||
f20baf8e DG |
72 | session_lock(session); |
73 | if (session->ust_session) { | |
733c9165 | 74 | const struct agent *agt; |
fefd409b | 75 | |
4da703ad | 76 | rcu_read_lock(); |
fefd409b DG |
77 | agt = trace_ust_find_agent(session->ust_session, app->domain); |
78 | if (agt) { | |
733c9165 | 79 | agent_update(agt, app); |
fefd409b | 80 | } |
4da703ad | 81 | rcu_read_unlock(); |
f20baf8e DG |
82 | } |
83 | session_unlock(session); | |
e32d7f27 | 84 | session_put(session); |
f20baf8e | 85 | } |
44760c20 JR |
86 | |
87 | rcu_read_lock(); | |
88 | /* | |
89 | * We are protected against the addition of new events by the session | |
90 | * list lock being held. | |
91 | */ | |
412d7227 SM |
92 | cds_lfht_for_each_entry(the_trigger_agents_ht_by_domain->ht, |
93 | &iter.iter, trigger_agent, node.node) { | |
44760c20 JR |
94 | agent_update(trigger_agent, app); |
95 | } | |
96 | rcu_read_unlock(); | |
f20baf8e DG |
97 | } |
98 | ||
4d076222 DG |
99 | /* |
100 | * Create and init socket from uri. | |
101 | */ | |
102 | static struct lttcomm_sock *init_tcp_socket(void) | |
103 | { | |
104 | int ret; | |
105 | struct lttng_uri *uri = NULL; | |
106 | struct lttcomm_sock *sock = NULL; | |
2288467f JG |
107 | unsigned int port; |
108 | bool bind_succeeded = false; | |
4d076222 DG |
109 | |
110 | /* | |
111 | * This should never fail since the URI is hardcoded and the port is set | |
112 | * before this thread is launched. | |
113 | */ | |
114 | ret = uri_parse(default_reg_uri, &uri); | |
a0377dfe FD |
115 | LTTNG_ASSERT(ret); |
116 | LTTNG_ASSERT(the_config.agent_tcp_port.begin > 0); | |
412d7227 | 117 | uri->port = the_config.agent_tcp_port.begin; |
4d076222 DG |
118 | |
119 | sock = lttcomm_alloc_sock_from_uri(uri); | |
120 | uri_free(uri); | |
121 | if (sock == NULL) { | |
bd0514a5 | 122 | ERR("agent allocating TCP socket"); |
4d076222 DG |
123 | goto error; |
124 | } | |
125 | ||
126 | ret = lttcomm_create_sock(sock); | |
127 | if (ret < 0) { | |
128 | goto error; | |
129 | } | |
130 | ||
412d7227 SM |
131 | for (port = the_config.agent_tcp_port.begin; |
132 | port <= the_config.agent_tcp_port.end; port++) { | |
2288467f JG |
133 | ret = lttcomm_sock_set_port(sock, (uint16_t) port); |
134 | if (ret) { | |
bd0514a5 | 135 | ERR("Failed to set port %u on socket", |
2288467f JG |
136 | port); |
137 | goto error; | |
138 | } | |
bd0514a5 | 139 | DBG3("Trying to bind on port %u", port); |
2288467f JG |
140 | ret = sock->ops->bind(sock); |
141 | if (!ret) { | |
142 | bind_succeeded = true; | |
143 | break; | |
144 | } | |
145 | ||
146 | if (errno == EADDRINUSE) { | |
147 | DBG("Failed to bind to port %u since it is already in use", | |
148 | port); | |
149 | } else { | |
150 | PERROR("Failed to bind to port %u", port); | |
151 | goto error; | |
152 | } | |
153 | } | |
154 | ||
155 | if (!bind_succeeded) { | |
412d7227 SM |
156 | if (the_config.agent_tcp_port.begin == |
157 | the_config.agent_tcp_port.end) { | |
2288467f | 158 | WARN("Another process is already using the agent port %i. " |
412d7227 SM |
159 | "Agent support will be deactivated.", |
160 | the_config.agent_tcp_port.begin); | |
2288467f JG |
161 | goto error; |
162 | } else { | |
163 | WARN("All ports in the range [%i, %i] are already in use. " | |
412d7227 SM |
164 | "Agent support will be deactivated.", |
165 | the_config.agent_tcp_port.begin, | |
166 | the_config.agent_tcp_port.end); | |
2288467f JG |
167 | goto error; |
168 | } | |
4d076222 DG |
169 | } |
170 | ||
171 | ret = sock->ops->listen(sock, -1); | |
172 | if (ret < 0) { | |
173 | goto error; | |
174 | } | |
175 | ||
bd0514a5 | 176 | DBG("Listening on TCP port %u and socket %d", |
2288467f | 177 | port, sock->fd); |
4d076222 DG |
178 | |
179 | return sock; | |
180 | ||
181 | error: | |
182 | if (sock) { | |
183 | lttcomm_destroy_sock(sock); | |
184 | } | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Close and destroy the given TCP socket. | |
190 | */ | |
191 | static void destroy_tcp_socket(struct lttcomm_sock *sock) | |
192 | { | |
2288467f JG |
193 | int ret; |
194 | uint16_t port; | |
195 | ||
a0377dfe | 196 | LTTNG_ASSERT(sock); |
4d076222 | 197 | |
2288467f JG |
198 | ret = lttcomm_sock_get_port(sock, &port); |
199 | if (ret) { | |
bd0514a5 | 200 | ERR("Failed to get port of agent TCP socket"); |
2288467f JG |
201 | port = 0; |
202 | } | |
203 | ||
bd0514a5 | 204 | DBG3("Destroy TCP socket on port %" PRIu16, |
2288467f | 205 | port); |
4d076222 DG |
206 | |
207 | /* This will return gracefully if fd is invalid. */ | |
208 | sock->ops->close(sock); | |
209 | lttcomm_destroy_sock(sock); | |
210 | } | |
211 | ||
733c9165 JG |
212 | static const char *domain_type_str(enum lttng_domain_type domain_type) |
213 | { | |
214 | switch (domain_type) { | |
215 | case LTTNG_DOMAIN_NONE: | |
216 | return "none"; | |
217 | case LTTNG_DOMAIN_KERNEL: | |
218 | return "kernel"; | |
219 | case LTTNG_DOMAIN_UST: | |
220 | return "ust"; | |
221 | case LTTNG_DOMAIN_JUL: | |
222 | return "jul"; | |
223 | case LTTNG_DOMAIN_LOG4J: | |
224 | return "log4j"; | |
225 | case LTTNG_DOMAIN_PYTHON: | |
226 | return "python"; | |
227 | default: | |
228 | return "unknown"; | |
229 | } | |
230 | } | |
231 | ||
232 | static bool is_agent_protocol_version_supported( | |
233 | const struct agent_protocol_version *version) | |
234 | { | |
235 | const bool is_supported = version->major == AGENT_MAJOR_VERSION && | |
236 | version->minor == AGENT_MINOR_VERSION; | |
237 | ||
238 | if (!is_supported) { | |
239 | WARN("Refusing agent connection: unsupported protocol version %ui.%ui, expected %i.%i", | |
240 | version->major, version->minor, | |
241 | AGENT_MAJOR_VERSION, AGENT_MINOR_VERSION); | |
242 | } | |
243 | ||
244 | return is_supported; | |
245 | } | |
246 | ||
f20baf8e | 247 | /* |
733c9165 | 248 | * Handle a new agent connection on the registration socket. |
f20baf8e | 249 | * |
733c9165 JG |
250 | * Returns 0 on success, or else a negative errno value. |
251 | * On success, the resulting socket is returned through `agent_app_socket` | |
252 | * and the application's reported id is updated through `agent_app_id`. | |
f20baf8e | 253 | */ |
733c9165 JG |
254 | static int accept_agent_connection( |
255 | struct lttcomm_sock *reg_sock, | |
256 | struct agent_app_id *agent_app_id, | |
257 | struct lttcomm_sock **agent_app_socket) | |
f20baf8e DG |
258 | { |
259 | int ret; | |
733c9165 | 260 | struct agent_protocol_version agent_version; |
f20baf8e | 261 | ssize_t size; |
022d91ba | 262 | struct agent_register_msg msg; |
f20baf8e DG |
263 | struct lttcomm_sock *new_sock; |
264 | ||
a0377dfe | 265 | LTTNG_ASSERT(reg_sock); |
f20baf8e DG |
266 | |
267 | new_sock = reg_sock->ops->accept(reg_sock); | |
268 | if (!new_sock) { | |
269 | ret = -ENOTCONN; | |
733c9165 | 270 | goto end; |
f20baf8e DG |
271 | } |
272 | ||
273 | size = new_sock->ops->recvmsg(new_sock, &msg, sizeof(msg), 0); | |
274 | if (size < sizeof(msg)) { | |
733c9165 JG |
275 | if (size < 0) { |
276 | PERROR("Failed to register new agent application"); | |
277 | } else if (size != 0) { | |
278 | ERR("Failed to register new agent application: invalid registration message length: expected length = %zu, message length = %zd", | |
279 | sizeof(msg), size); | |
280 | } else { | |
281 | DBG("Failed to register new agent application: connection closed"); | |
282 | } | |
79865500 | 283 | ret = -EINVAL; |
733c9165 | 284 | goto error_close_socket; |
9474416f | 285 | } |
f20baf8e | 286 | |
733c9165 JG |
287 | agent_version = (struct agent_protocol_version) { |
288 | be32toh(msg.major_version), | |
289 | be32toh(msg.minor_version), | |
290 | }; | |
f20baf8e | 291 | |
733c9165 JG |
292 | /* Test communication protocol version of the registering agent. */ |
293 | if (!is_agent_protocol_version_supported(&agent_version)) { | |
294 | ret = -EINVAL; | |
295 | goto error_close_socket; | |
f20baf8e DG |
296 | } |
297 | ||
733c9165 | 298 | *agent_app_id = (struct agent_app_id) { |
733c9165 | 299 | .pid = (pid_t) be32toh(msg.pid), |
7966af57 | 300 | .domain = (lttng_domain_type) be32toh(msg.domain), |
733c9165 | 301 | }; |
f20baf8e | 302 | |
733c9165 JG |
303 | DBG2("New registration for agent application: pid = %ld, domain = %s, socket fd = %d", |
304 | (long) agent_app_id->pid, | |
305 | domain_type_str(agent_app_id->domain), new_sock->fd); | |
1b500e7a | 306 | |
733c9165 JG |
307 | *agent_app_socket = new_sock; |
308 | new_sock = NULL; | |
309 | ret = 0; | |
310 | goto end; | |
f20baf8e | 311 | |
733c9165 | 312 | error_close_socket: |
f20baf8e DG |
313 | new_sock->ops->close(new_sock); |
314 | lttcomm_destroy_sock(new_sock); | |
733c9165 | 315 | end: |
f20baf8e DG |
316 | return ret; |
317 | } | |
318 | ||
f28f9e44 JG |
319 | bool agent_tracing_is_enabled(void) |
320 | { | |
321 | int enabled; | |
322 | ||
323 | enabled = uatomic_read(&agent_tracing_enabled); | |
a0377dfe | 324 | LTTNG_ASSERT(enabled != -1); |
f28f9e44 JG |
325 | return enabled == 1; |
326 | } | |
327 | ||
2288467f JG |
328 | /* |
329 | * Write agent TCP port using the rundir. | |
330 | */ | |
331 | static int write_agent_port(uint16_t port) | |
332 | { | |
412d7227 SM |
333 | return utils_create_pid_file( |
334 | (pid_t) port, the_config.agent_port_file_path.value); | |
2288467f JG |
335 | } |
336 | ||
c78d8e86 JG |
337 | static |
338 | void mark_thread_as_ready(struct thread_notifiers *notifiers) | |
339 | { | |
340 | DBG("Marking agent management thread as ready"); | |
341 | sem_post(¬ifiers->ready); | |
342 | } | |
343 | ||
344 | static | |
345 | void wait_until_thread_is_ready(struct thread_notifiers *notifiers) | |
346 | { | |
347 | DBG("Waiting for agent management thread to be ready"); | |
348 | sem_wait(¬ifiers->ready); | |
349 | DBG("Agent management thread is ready"); | |
350 | } | |
351 | ||
4d076222 DG |
352 | /* |
353 | * This thread manage application notify communication. | |
354 | */ | |
8a7e4590 | 355 | static void *thread_agent_management(void *data) |
4d076222 DG |
356 | { |
357 | int i, ret, pollfd; | |
358 | uint32_t revents, nb_fd; | |
359 | struct lttng_poll_event events; | |
360 | struct lttcomm_sock *reg_sock; | |
7966af57 | 361 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
c78d8e86 JG |
362 | const int quit_pipe_read_fd = lttng_pipe_get_readfd( |
363 | notifiers->quit_pipe); | |
4d076222 | 364 | |
bd0514a5 | 365 | DBG("Manage agent application registration."); |
4d076222 DG |
366 | |
367 | rcu_register_thread(); | |
368 | rcu_thread_online(); | |
369 | ||
022d91ba | 370 | /* Agent initialization call MUST be called before starting the thread. */ |
a0377dfe | 371 | LTTNG_ASSERT(the_agent_apps_ht_by_sock); |
f20baf8e | 372 | |
8a7e4590 JG |
373 | /* Create pollset with size 2, quit pipe and registration socket. */ |
374 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
4d076222 DG |
375 | if (ret < 0) { |
376 | goto error_poll_create; | |
377 | } | |
378 | ||
8a7e4590 JG |
379 | ret = lttng_poll_add(&events, quit_pipe_read_fd, |
380 | LPOLLIN | LPOLLERR); | |
381 | if (ret < 0) { | |
382 | goto error_tcp_socket; | |
383 | } | |
384 | ||
4d076222 | 385 | reg_sock = init_tcp_socket(); |
2288467f JG |
386 | if (reg_sock) { |
387 | uint16_t port; | |
388 | ||
cc3b9644 | 389 | ret = lttcomm_sock_get_port(reg_sock, &port); |
a0377dfe | 390 | LTTNG_ASSERT(ret == 0); |
2288467f JG |
391 | |
392 | ret = write_agent_port(port); | |
393 | if (ret) { | |
bd0514a5 | 394 | ERR("Failed to create agent port file: agent tracing will be unavailable"); |
2288467f | 395 | /* Don't prevent the launch of the sessiond on error. */ |
c78d8e86 | 396 | mark_thread_as_ready(notifiers); |
2288467f JG |
397 | goto error; |
398 | } | |
399 | } else { | |
400 | /* Don't prevent the launch of the sessiond on error. */ | |
c78d8e86 | 401 | mark_thread_as_ready(notifiers); |
2288467f JG |
402 | goto error_tcp_socket; |
403 | } | |
f28f9e44 JG |
404 | |
405 | /* | |
406 | * Signal that the agent thread is ready. The command thread | |
407 | * may start to query whether or not agent tracing is enabled. | |
408 | */ | |
2288467f | 409 | uatomic_set(&agent_tracing_enabled, 1); |
c78d8e86 | 410 | mark_thread_as_ready(notifiers); |
4d076222 | 411 | |
733c9165 | 412 | /* Add TCP socket to the poll set. */ |
4d076222 DG |
413 | ret = lttng_poll_add(&events, reg_sock->fd, |
414 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); | |
415 | if (ret < 0) { | |
416 | goto error; | |
417 | } | |
418 | ||
419 | while (1) { | |
bd0514a5 | 420 | DBG3("Manage agent polling"); |
4d076222 DG |
421 | |
422 | /* Inifinite blocking call, waiting for transmission */ | |
423 | restart: | |
424 | ret = lttng_poll_wait(&events, -1); | |
bd0514a5 | 425 | DBG3("Manage agent return from poll on %d fds", |
7fa2082e | 426 | LTTNG_POLL_GETNB(&events)); |
4d076222 DG |
427 | if (ret < 0) { |
428 | /* | |
429 | * Restart interrupted system call. | |
430 | */ | |
431 | if (errno == EINTR) { | |
432 | goto restart; | |
433 | } | |
434 | goto error; | |
435 | } | |
436 | nb_fd = ret; | |
bd0514a5 | 437 | DBG3("%d fd ready", nb_fd); |
4d076222 DG |
438 | |
439 | for (i = 0; i < nb_fd; i++) { | |
440 | /* Fetch once the poll data */ | |
441 | revents = LTTNG_POLL_GETEV(&events, i); | |
442 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
443 | ||
444 | /* Thread quit pipe has been closed. Killing thread. */ | |
8a7e4590 | 445 | if (pollfd == quit_pipe_read_fd) { |
4d076222 DG |
446 | goto exit; |
447 | } | |
448 | ||
733c9165 | 449 | /* Activity on the registration socket. */ |
03e43155 | 450 | if (revents & LPOLLIN) { |
733c9165 JG |
451 | struct agent_app_id new_app_id; |
452 | struct agent_app *new_app = NULL; | |
453 | struct lttcomm_sock *new_app_socket; | |
454 | int new_app_socket_fd; | |
f20baf8e | 455 | |
a0377dfe | 456 | LTTNG_ASSERT(pollfd == reg_sock->fd); |
733c9165 JG |
457 | |
458 | ret = accept_agent_connection( | |
459 | reg_sock, &new_app_id, &new_app_socket); | |
460 | if (ret < 0) { | |
461 | /* Errors are already logged. */ | |
f20baf8e DG |
462 | continue; |
463 | } | |
464 | ||
03e43155 | 465 | /* |
733c9165 JG |
466 | * new_app_socket's ownership has been |
467 | * transferred to the new agent app. | |
03e43155 | 468 | */ |
733c9165 JG |
469 | new_app = agent_create_app(new_app_id.pid, |
470 | new_app_id.domain, | |
471 | new_app_socket); | |
472 | if (!new_app) { | |
473 | new_app_socket->ops->close( | |
474 | new_app_socket); | |
475 | continue; | |
476 | } | |
477 | new_app_socket_fd = new_app_socket->fd; | |
478 | new_app_socket = NULL; | |
479 | ||
480 | /* | |
481 | * Since this is a command socket (write then | |
482 | * read), only add poll error event to only | |
483 | * detect shutdown. | |
484 | */ | |
485 | ret = lttng_poll_add(&events, new_app_socket_fd, | |
f20baf8e DG |
486 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); |
487 | if (ret < 0) { | |
733c9165 | 488 | agent_destroy_app(new_app); |
f20baf8e DG |
489 | continue; |
490 | } | |
491 | ||
733c9165 JG |
492 | /* |
493 | * Prevent sessions from being modified while | |
494 | * the agent application's configuration is | |
495 | * updated. | |
496 | */ | |
497 | session_lock_list(); | |
498 | ||
499 | /* | |
500 | * Update the newly registered applications's | |
501 | * configuration. | |
502 | */ | |
503 | update_agent_app(new_app); | |
1b500e7a | 504 | |
733c9165 | 505 | ret = agent_send_registration_done(new_app); |
03e43155 | 506 | if (ret < 0) { |
733c9165 JG |
507 | agent_destroy_app(new_app); |
508 | /* Removing from the poll set. */ | |
509 | ret = lttng_poll_del(&events, | |
510 | new_app_socket_fd); | |
03e43155 | 511 | if (ret < 0) { |
733c9165 | 512 | session_unlock_list(); |
03e43155 MD |
513 | goto error; |
514 | } | |
03e43155 MD |
515 | continue; |
516 | } | |
733c9165 JG |
517 | |
518 | /* Publish the new agent app. */ | |
519 | agent_add_app(new_app); | |
520 | ||
521 | session_unlock_list(); | |
03e43155 MD |
522 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
523 | /* Removing from the poll set */ | |
524 | ret = lttng_poll_del(&events, pollfd); | |
525 | if (ret < 0) { | |
526 | goto error; | |
527 | } | |
528 | agent_destroy_app_by_sock(pollfd); | |
4d076222 | 529 | } else { |
03e43155 MD |
530 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
531 | goto error; | |
4d076222 DG |
532 | } |
533 | } | |
534 | } | |
535 | ||
536 | exit: | |
f20baf8e DG |
537 | /* Whatever happens, try to delete it and exit. */ |
538 | (void) lttng_poll_del(&events, reg_sock->fd); | |
4d076222 DG |
539 | error: |
540 | destroy_tcp_socket(reg_sock); | |
541 | error_tcp_socket: | |
542 | lttng_poll_clean(&events); | |
543 | error_poll_create: | |
2288467f | 544 | uatomic_set(&agent_tracing_enabled, 0); |
bd0514a5 | 545 | DBG("Cleaning up and stopping."); |
4d076222 DG |
546 | rcu_thread_offline(); |
547 | rcu_unregister_thread(); | |
548 | return NULL; | |
549 | } | |
8a7e4590 JG |
550 | |
551 | static bool shutdown_agent_management_thread(void *data) | |
552 | { | |
7966af57 | 553 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
c78d8e86 | 554 | const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); |
8a7e4590 JG |
555 | |
556 | return notify_thread_pipe(write_fd) == 1; | |
557 | } | |
558 | ||
5b093681 JG |
559 | static void cleanup_agent_management_thread(void *data) |
560 | { | |
7966af57 | 561 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
5b093681 | 562 | |
c78d8e86 JG |
563 | lttng_pipe_destroy(notifiers->quit_pipe); |
564 | sem_destroy(¬ifiers->ready); | |
565 | free(notifiers); | |
5b093681 JG |
566 | } |
567 | ||
568 | bool launch_agent_management_thread(void) | |
8a7e4590 | 569 | { |
c78d8e86 | 570 | struct thread_notifiers *notifiers; |
8a7e4590 JG |
571 | struct lttng_thread *thread; |
572 | ||
7966af57 | 573 | notifiers = (thread_notifiers *) zmalloc(sizeof(*notifiers)); |
c78d8e86 | 574 | if (!notifiers) { |
21fa020e | 575 | goto error_alloc; |
c78d8e86 JG |
576 | } |
577 | ||
578 | sem_init(¬ifiers->ready, 0, 0); | |
579 | notifiers->quit_pipe = lttng_pipe_open(FD_CLOEXEC); | |
580 | if (!notifiers->quit_pipe) { | |
8a7e4590 JG |
581 | goto error; |
582 | } | |
583 | thread = lttng_thread_create("Agent management", | |
584 | thread_agent_management, | |
585 | shutdown_agent_management_thread, | |
5b093681 | 586 | cleanup_agent_management_thread, |
c78d8e86 | 587 | notifiers); |
8a7e4590 JG |
588 | if (!thread) { |
589 | goto error; | |
590 | } | |
c78d8e86 | 591 | wait_until_thread_is_ready(notifiers); |
8a7e4590 JG |
592 | lttng_thread_put(thread); |
593 | return true; | |
594 | error: | |
c78d8e86 | 595 | cleanup_agent_management_thread(notifiers); |
21fa020e | 596 | error_alloc: |
8a7e4590 JG |
597 | return false; |
598 | } |