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 | 9 | |
c9e313bc SM |
10 | #include <common/common.hpp> |
11 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
12 | #include <common/uri.hpp> | |
13 | #include <common/utils.hpp> | |
14 | ||
15 | #include <common/compat/endian.hpp> | |
16 | ||
17 | #include "fd-limit.hpp" | |
18 | #include "agent-thread.hpp" | |
19 | #include "agent.hpp" | |
20 | #include "lttng-sessiond.hpp" | |
21 | #include "session.hpp" | |
22 | #include "utils.hpp" | |
23 | #include "thread.hpp" | |
4d076222 | 24 | |
f1494934 | 25 | namespace { |
c78d8e86 JG |
26 | struct thread_notifiers { |
27 | struct lttng_pipe *quit_pipe; | |
28 | sem_t ready; | |
29 | }; | |
30 | ||
733c9165 JG |
31 | struct agent_app_id { |
32 | pid_t pid; | |
33 | enum lttng_domain_type domain; | |
34 | }; | |
35 | ||
36 | struct agent_protocol_version { | |
37 | unsigned int major, minor; | |
38 | }; | |
39 | ||
f1494934 | 40 | int agent_tracing_enabled = -1; |
f28f9e44 | 41 | |
4d076222 DG |
42 | /* |
43 | * Note that there is not port here. It's set after this URI is parsed so we | |
44 | * can let the user define a custom one. However, localhost is ALWAYS the | |
45 | * default listening address. | |
46 | */ | |
f1494934 JG |
47 | const char *default_reg_uri = "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS; |
48 | } /* namespace */ | |
4d076222 | 49 | |
f20baf8e | 50 | /* |
022d91ba | 51 | * Update agent application using the given socket. This is done just after |
f20baf8e DG |
52 | * registration was successful. |
53 | * | |
733c9165 JG |
54 | * This will acquire the various sessions' lock; none must be held by the |
55 | * caller. | |
56 | * The caller must hold the session list lock. | |
f20baf8e | 57 | */ |
733c9165 | 58 | static void update_agent_app(const struct agent_app *app) |
f20baf8e DG |
59 | { |
60 | struct ltt_session *session, *stmp; | |
61 | struct ltt_session_list *list; | |
44760c20 JR |
62 | struct agent *trigger_agent; |
63 | struct lttng_ht_iter iter; | |
f20baf8e DG |
64 | |
65 | list = session_get_list(); | |
a0377dfe | 66 | LTTNG_ASSERT(list); |
f20baf8e | 67 | |
f20baf8e | 68 | cds_list_for_each_entry_safe(session, stmp, &list->head, list) { |
e32d7f27 JG |
69 | if (!session_get(session)) { |
70 | continue; | |
71 | } | |
72 | ||
f20baf8e DG |
73 | session_lock(session); |
74 | if (session->ust_session) { | |
733c9165 | 75 | const struct agent *agt; |
fefd409b | 76 | |
4da703ad | 77 | rcu_read_lock(); |
fefd409b DG |
78 | agt = trace_ust_find_agent(session->ust_session, app->domain); |
79 | if (agt) { | |
733c9165 | 80 | agent_update(agt, app); |
fefd409b | 81 | } |
4da703ad | 82 | rcu_read_unlock(); |
f20baf8e DG |
83 | } |
84 | session_unlock(session); | |
e32d7f27 | 85 | session_put(session); |
f20baf8e | 86 | } |
44760c20 JR |
87 | |
88 | rcu_read_lock(); | |
89 | /* | |
90 | * We are protected against the addition of new events by the session | |
91 | * list lock being held. | |
92 | */ | |
412d7227 SM |
93 | cds_lfht_for_each_entry(the_trigger_agents_ht_by_domain->ht, |
94 | &iter.iter, trigger_agent, node.node) { | |
44760c20 JR |
95 | agent_update(trigger_agent, app); |
96 | } | |
97 | rcu_read_unlock(); | |
f20baf8e DG |
98 | } |
99 | ||
4d076222 DG |
100 | /* |
101 | * Create and init socket from uri. | |
102 | */ | |
103 | static struct lttcomm_sock *init_tcp_socket(void) | |
104 | { | |
105 | int ret; | |
106 | struct lttng_uri *uri = NULL; | |
107 | struct lttcomm_sock *sock = NULL; | |
2288467f JG |
108 | unsigned int port; |
109 | bool bind_succeeded = false; | |
4d076222 DG |
110 | |
111 | /* | |
112 | * This should never fail since the URI is hardcoded and the port is set | |
113 | * before this thread is launched. | |
114 | */ | |
115 | ret = uri_parse(default_reg_uri, &uri); | |
a0377dfe FD |
116 | LTTNG_ASSERT(ret); |
117 | LTTNG_ASSERT(the_config.agent_tcp_port.begin > 0); | |
412d7227 | 118 | uri->port = the_config.agent_tcp_port.begin; |
4d076222 DG |
119 | |
120 | sock = lttcomm_alloc_sock_from_uri(uri); | |
121 | uri_free(uri); | |
122 | if (sock == NULL) { | |
bd0514a5 | 123 | ERR("agent allocating TCP socket"); |
4d076222 DG |
124 | goto error; |
125 | } | |
126 | ||
127 | ret = lttcomm_create_sock(sock); | |
128 | if (ret < 0) { | |
129 | goto error; | |
130 | } | |
131 | ||
412d7227 SM |
132 | for (port = the_config.agent_tcp_port.begin; |
133 | port <= the_config.agent_tcp_port.end; port++) { | |
2288467f JG |
134 | ret = lttcomm_sock_set_port(sock, (uint16_t) port); |
135 | if (ret) { | |
bd0514a5 | 136 | ERR("Failed to set port %u on socket", |
2288467f JG |
137 | port); |
138 | goto error; | |
139 | } | |
bd0514a5 | 140 | DBG3("Trying to bind on port %u", port); |
2288467f JG |
141 | ret = sock->ops->bind(sock); |
142 | if (!ret) { | |
143 | bind_succeeded = true; | |
144 | break; | |
145 | } | |
146 | ||
147 | if (errno == EADDRINUSE) { | |
148 | DBG("Failed to bind to port %u since it is already in use", | |
149 | port); | |
150 | } else { | |
151 | PERROR("Failed to bind to port %u", port); | |
152 | goto error; | |
153 | } | |
154 | } | |
155 | ||
156 | if (!bind_succeeded) { | |
412d7227 SM |
157 | if (the_config.agent_tcp_port.begin == |
158 | the_config.agent_tcp_port.end) { | |
2288467f | 159 | WARN("Another process is already using the agent port %i. " |
412d7227 SM |
160 | "Agent support will be deactivated.", |
161 | the_config.agent_tcp_port.begin); | |
2288467f JG |
162 | goto error; |
163 | } else { | |
164 | WARN("All ports in the range [%i, %i] are already in use. " | |
412d7227 SM |
165 | "Agent support will be deactivated.", |
166 | the_config.agent_tcp_port.begin, | |
167 | the_config.agent_tcp_port.end); | |
2288467f JG |
168 | goto error; |
169 | } | |
4d076222 DG |
170 | } |
171 | ||
172 | ret = sock->ops->listen(sock, -1); | |
173 | if (ret < 0) { | |
174 | goto error; | |
175 | } | |
176 | ||
bd0514a5 | 177 | DBG("Listening on TCP port %u and socket %d", |
2288467f | 178 | port, sock->fd); |
4d076222 DG |
179 | |
180 | return sock; | |
181 | ||
182 | error: | |
183 | if (sock) { | |
184 | lttcomm_destroy_sock(sock); | |
185 | } | |
186 | return NULL; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Close and destroy the given TCP socket. | |
191 | */ | |
192 | static void destroy_tcp_socket(struct lttcomm_sock *sock) | |
193 | { | |
2288467f JG |
194 | int ret; |
195 | uint16_t port; | |
196 | ||
a0377dfe | 197 | LTTNG_ASSERT(sock); |
4d076222 | 198 | |
2288467f JG |
199 | ret = lttcomm_sock_get_port(sock, &port); |
200 | if (ret) { | |
bd0514a5 | 201 | ERR("Failed to get port of agent TCP socket"); |
2288467f JG |
202 | port = 0; |
203 | } | |
204 | ||
bd0514a5 | 205 | DBG3("Destroy TCP socket on port %" PRIu16, |
2288467f | 206 | port); |
4d076222 DG |
207 | |
208 | /* This will return gracefully if fd is invalid. */ | |
209 | sock->ops->close(sock); | |
210 | lttcomm_destroy_sock(sock); | |
211 | } | |
212 | ||
733c9165 JG |
213 | static const char *domain_type_str(enum lttng_domain_type domain_type) |
214 | { | |
215 | switch (domain_type) { | |
216 | case LTTNG_DOMAIN_NONE: | |
217 | return "none"; | |
218 | case LTTNG_DOMAIN_KERNEL: | |
219 | return "kernel"; | |
220 | case LTTNG_DOMAIN_UST: | |
221 | return "ust"; | |
222 | case LTTNG_DOMAIN_JUL: | |
223 | return "jul"; | |
224 | case LTTNG_DOMAIN_LOG4J: | |
225 | return "log4j"; | |
226 | case LTTNG_DOMAIN_PYTHON: | |
227 | return "python"; | |
228 | default: | |
229 | return "unknown"; | |
230 | } | |
231 | } | |
232 | ||
233 | static bool is_agent_protocol_version_supported( | |
234 | const struct agent_protocol_version *version) | |
235 | { | |
236 | const bool is_supported = version->major == AGENT_MAJOR_VERSION && | |
237 | version->minor == AGENT_MINOR_VERSION; | |
238 | ||
239 | if (!is_supported) { | |
240 | WARN("Refusing agent connection: unsupported protocol version %ui.%ui, expected %i.%i", | |
241 | version->major, version->minor, | |
242 | AGENT_MAJOR_VERSION, AGENT_MINOR_VERSION); | |
243 | } | |
244 | ||
245 | return is_supported; | |
246 | } | |
247 | ||
f20baf8e | 248 | /* |
733c9165 | 249 | * Handle a new agent connection on the registration socket. |
f20baf8e | 250 | * |
733c9165 JG |
251 | * Returns 0 on success, or else a negative errno value. |
252 | * On success, the resulting socket is returned through `agent_app_socket` | |
253 | * and the application's reported id is updated through `agent_app_id`. | |
f20baf8e | 254 | */ |
733c9165 JG |
255 | static int accept_agent_connection( |
256 | struct lttcomm_sock *reg_sock, | |
257 | struct agent_app_id *agent_app_id, | |
258 | struct lttcomm_sock **agent_app_socket) | |
f20baf8e DG |
259 | { |
260 | int ret; | |
733c9165 | 261 | struct agent_protocol_version agent_version; |
f20baf8e | 262 | ssize_t size; |
022d91ba | 263 | struct agent_register_msg msg; |
f20baf8e DG |
264 | struct lttcomm_sock *new_sock; |
265 | ||
a0377dfe | 266 | LTTNG_ASSERT(reg_sock); |
f20baf8e DG |
267 | |
268 | new_sock = reg_sock->ops->accept(reg_sock); | |
269 | if (!new_sock) { | |
270 | ret = -ENOTCONN; | |
733c9165 | 271 | goto end; |
f20baf8e DG |
272 | } |
273 | ||
274 | size = new_sock->ops->recvmsg(new_sock, &msg, sizeof(msg), 0); | |
275 | if (size < sizeof(msg)) { | |
733c9165 JG |
276 | if (size < 0) { |
277 | PERROR("Failed to register new agent application"); | |
278 | } else if (size != 0) { | |
279 | ERR("Failed to register new agent application: invalid registration message length: expected length = %zu, message length = %zd", | |
280 | sizeof(msg), size); | |
281 | } else { | |
282 | DBG("Failed to register new agent application: connection closed"); | |
283 | } | |
79865500 | 284 | ret = -EINVAL; |
733c9165 | 285 | goto error_close_socket; |
9474416f | 286 | } |
f20baf8e | 287 | |
733c9165 JG |
288 | agent_version = (struct agent_protocol_version) { |
289 | be32toh(msg.major_version), | |
290 | be32toh(msg.minor_version), | |
291 | }; | |
f20baf8e | 292 | |
733c9165 JG |
293 | /* Test communication protocol version of the registering agent. */ |
294 | if (!is_agent_protocol_version_supported(&agent_version)) { | |
295 | ret = -EINVAL; | |
296 | goto error_close_socket; | |
f20baf8e DG |
297 | } |
298 | ||
733c9165 | 299 | *agent_app_id = (struct agent_app_id) { |
733c9165 | 300 | .pid = (pid_t) be32toh(msg.pid), |
7966af57 | 301 | .domain = (lttng_domain_type) be32toh(msg.domain), |
733c9165 | 302 | }; |
f20baf8e | 303 | |
733c9165 JG |
304 | DBG2("New registration for agent application: pid = %ld, domain = %s, socket fd = %d", |
305 | (long) agent_app_id->pid, | |
306 | domain_type_str(agent_app_id->domain), new_sock->fd); | |
1b500e7a | 307 | |
733c9165 JG |
308 | *agent_app_socket = new_sock; |
309 | new_sock = NULL; | |
310 | ret = 0; | |
311 | goto end; | |
f20baf8e | 312 | |
733c9165 | 313 | error_close_socket: |
f20baf8e DG |
314 | new_sock->ops->close(new_sock); |
315 | lttcomm_destroy_sock(new_sock); | |
733c9165 | 316 | end: |
f20baf8e DG |
317 | return ret; |
318 | } | |
319 | ||
f28f9e44 JG |
320 | bool agent_tracing_is_enabled(void) |
321 | { | |
322 | int enabled; | |
323 | ||
324 | enabled = uatomic_read(&agent_tracing_enabled); | |
a0377dfe | 325 | LTTNG_ASSERT(enabled != -1); |
f28f9e44 JG |
326 | return enabled == 1; |
327 | } | |
328 | ||
2288467f JG |
329 | /* |
330 | * Write agent TCP port using the rundir. | |
331 | */ | |
332 | static int write_agent_port(uint16_t port) | |
333 | { | |
412d7227 SM |
334 | return utils_create_pid_file( |
335 | (pid_t) port, the_config.agent_port_file_path.value); | |
2288467f JG |
336 | } |
337 | ||
c78d8e86 JG |
338 | static |
339 | void mark_thread_as_ready(struct thread_notifiers *notifiers) | |
340 | { | |
341 | DBG("Marking agent management thread as ready"); | |
342 | sem_post(¬ifiers->ready); | |
343 | } | |
344 | ||
345 | static | |
346 | void wait_until_thread_is_ready(struct thread_notifiers *notifiers) | |
347 | { | |
348 | DBG("Waiting for agent management thread to be ready"); | |
349 | sem_wait(¬ifiers->ready); | |
350 | DBG("Agent management thread is ready"); | |
351 | } | |
352 | ||
4d076222 DG |
353 | /* |
354 | * This thread manage application notify communication. | |
355 | */ | |
8a7e4590 | 356 | static void *thread_agent_management(void *data) |
4d076222 | 357 | { |
8a00688e MJ |
358 | int i, ret; |
359 | uint32_t nb_fd; | |
4d076222 DG |
360 | struct lttng_poll_event events; |
361 | struct lttcomm_sock *reg_sock; | |
7966af57 | 362 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
8a00688e | 363 | const auto thread_quit_pipe_fd = lttng_pipe_get_readfd( |
c78d8e86 | 364 | notifiers->quit_pipe); |
4d076222 | 365 | |
bd0514a5 | 366 | DBG("Manage agent application registration."); |
4d076222 DG |
367 | |
368 | rcu_register_thread(); | |
369 | rcu_thread_online(); | |
370 | ||
022d91ba | 371 | /* Agent initialization call MUST be called before starting the thread. */ |
a0377dfe | 372 | LTTNG_ASSERT(the_agent_apps_ht_by_sock); |
f20baf8e | 373 | |
8a7e4590 JG |
374 | /* Create pollset with size 2, quit pipe and registration socket. */ |
375 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
4d076222 DG |
376 | if (ret < 0) { |
377 | goto error_poll_create; | |
378 | } | |
379 | ||
1524f98c | 380 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN); |
8a7e4590 JG |
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. */ |
1524f98c | 413 | ret = lttng_poll_add(&events, reg_sock->fd, LPOLLIN | LPOLLRDHUP); |
4d076222 DG |
414 | if (ret < 0) { |
415 | goto error; | |
416 | } | |
417 | ||
418 | while (1) { | |
bd0514a5 | 419 | DBG3("Manage agent polling"); |
4d076222 DG |
420 | |
421 | /* Inifinite blocking call, waiting for transmission */ | |
422 | restart: | |
423 | ret = lttng_poll_wait(&events, -1); | |
bd0514a5 | 424 | DBG3("Manage agent return from poll on %d fds", |
7fa2082e | 425 | LTTNG_POLL_GETNB(&events)); |
4d076222 DG |
426 | if (ret < 0) { |
427 | /* | |
428 | * Restart interrupted system call. | |
429 | */ | |
430 | if (errno == EINTR) { | |
431 | goto restart; | |
432 | } | |
433 | goto error; | |
434 | } | |
435 | nb_fd = ret; | |
bd0514a5 | 436 | DBG3("%d fd ready", nb_fd); |
4d076222 DG |
437 | |
438 | for (i = 0; i < nb_fd; i++) { | |
439 | /* Fetch once the poll data */ | |
8a00688e MJ |
440 | const auto revents = LTTNG_POLL_GETEV(&events, i); |
441 | const auto pollfd = LTTNG_POLL_GETFD(&events, i); | |
4d076222 | 442 | |
8a00688e MJ |
443 | /* Activity on thread quit pipe, exiting. */ |
444 | if (pollfd == thread_quit_pipe_fd) { | |
445 | DBG("Activity on thread quit pipe"); | |
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 | */ | |
1524f98c | 485 | ret = lttng_poll_add(&events, new_app_socket_fd, LPOLLRDHUP); |
f20baf8e | 486 | if (ret < 0) { |
733c9165 | 487 | agent_destroy_app(new_app); |
f20baf8e DG |
488 | continue; |
489 | } | |
490 | ||
733c9165 JG |
491 | /* |
492 | * Prevent sessions from being modified while | |
493 | * the agent application's configuration is | |
494 | * updated. | |
495 | */ | |
496 | session_lock_list(); | |
497 | ||
498 | /* | |
499 | * Update the newly registered applications's | |
500 | * configuration. | |
501 | */ | |
502 | update_agent_app(new_app); | |
1b500e7a | 503 | |
733c9165 | 504 | ret = agent_send_registration_done(new_app); |
03e43155 | 505 | if (ret < 0) { |
733c9165 JG |
506 | agent_destroy_app(new_app); |
507 | /* Removing from the poll set. */ | |
508 | ret = lttng_poll_del(&events, | |
509 | new_app_socket_fd); | |
03e43155 | 510 | if (ret < 0) { |
733c9165 | 511 | session_unlock_list(); |
03e43155 MD |
512 | goto error; |
513 | } | |
03e43155 MD |
514 | continue; |
515 | } | |
733c9165 JG |
516 | |
517 | /* Publish the new agent app. */ | |
518 | agent_add_app(new_app); | |
519 | ||
520 | session_unlock_list(); | |
03e43155 MD |
521 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
522 | /* Removing from the poll set */ | |
523 | ret = lttng_poll_del(&events, pollfd); | |
524 | if (ret < 0) { | |
525 | goto error; | |
526 | } | |
527 | agent_destroy_app_by_sock(pollfd); | |
4d076222 | 528 | } else { |
03e43155 MD |
529 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
530 | goto error; | |
4d076222 DG |
531 | } |
532 | } | |
533 | } | |
534 | ||
535 | exit: | |
f20baf8e DG |
536 | /* Whatever happens, try to delete it and exit. */ |
537 | (void) lttng_poll_del(&events, reg_sock->fd); | |
4d076222 DG |
538 | error: |
539 | destroy_tcp_socket(reg_sock); | |
540 | error_tcp_socket: | |
541 | lttng_poll_clean(&events); | |
542 | error_poll_create: | |
2288467f | 543 | uatomic_set(&agent_tracing_enabled, 0); |
bd0514a5 | 544 | DBG("Cleaning up and stopping."); |
4d076222 DG |
545 | rcu_thread_offline(); |
546 | rcu_unregister_thread(); | |
547 | return NULL; | |
548 | } | |
8a7e4590 JG |
549 | |
550 | static bool shutdown_agent_management_thread(void *data) | |
551 | { | |
7966af57 | 552 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
c78d8e86 | 553 | const int write_fd = lttng_pipe_get_writefd(notifiers->quit_pipe); |
8a7e4590 JG |
554 | |
555 | return notify_thread_pipe(write_fd) == 1; | |
556 | } | |
557 | ||
5b093681 JG |
558 | static void cleanup_agent_management_thread(void *data) |
559 | { | |
7966af57 | 560 | struct thread_notifiers *notifiers = (thread_notifiers *) data; |
5b093681 | 561 | |
c78d8e86 JG |
562 | lttng_pipe_destroy(notifiers->quit_pipe); |
563 | sem_destroy(¬ifiers->ready); | |
564 | free(notifiers); | |
5b093681 JG |
565 | } |
566 | ||
567 | bool launch_agent_management_thread(void) | |
8a7e4590 | 568 | { |
c78d8e86 | 569 | struct thread_notifiers *notifiers; |
8a7e4590 JG |
570 | struct lttng_thread *thread; |
571 | ||
64803277 | 572 | notifiers = zmalloc<thread_notifiers>(); |
c78d8e86 | 573 | if (!notifiers) { |
21fa020e | 574 | goto error_alloc; |
c78d8e86 JG |
575 | } |
576 | ||
577 | sem_init(¬ifiers->ready, 0, 0); | |
578 | notifiers->quit_pipe = lttng_pipe_open(FD_CLOEXEC); | |
579 | if (!notifiers->quit_pipe) { | |
8a7e4590 JG |
580 | goto error; |
581 | } | |
582 | thread = lttng_thread_create("Agent management", | |
583 | thread_agent_management, | |
584 | shutdown_agent_management_thread, | |
5b093681 | 585 | cleanup_agent_management_thread, |
c78d8e86 | 586 | notifiers); |
8a7e4590 JG |
587 | if (!thread) { |
588 | goto error; | |
589 | } | |
c78d8e86 | 590 | wait_until_thread_is_ready(notifiers); |
8a7e4590 JG |
591 | lttng_thread_put(thread); |
592 | return true; | |
593 | error: | |
c78d8e86 | 594 | cleanup_agent_management_thread(notifiers); |
21fa020e | 595 | error_alloc: |
8a7e4590 JG |
596 | return false; |
597 | } |