Commit | Line | Data |
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917a718d JG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #include <stddef.h> | |
21 | #include <pthread.h> | |
22 | #include <signal.h> | |
23 | #include <sys/stat.h> | |
24 | #include <common/compat/getenv.h> | |
25 | #include <common/unix.h> | |
26 | #include <common/utils.h> | |
27 | #include <lttng/userspace-probe-internal.h> | |
28 | #include <lttng/event-internal.h> | |
b178f53e JG |
29 | #include <lttng/session-internal.h> |
30 | #include <lttng/session-descriptor-internal.h> | |
917a718d JG |
31 | |
32 | #include "client.h" | |
33 | #include "lttng-sessiond.h" | |
34 | #include "cmd.h" | |
35 | #include "kernel.h" | |
36 | #include "save.h" | |
37 | #include "health-sessiond.h" | |
38 | #include "testpoint.h" | |
39 | #include "utils.h" | |
4ec029ed | 40 | #include "manage-consumer.h" |
917a718d JG |
41 | |
42 | static bool is_root; | |
43 | ||
44 | static struct thread_state { | |
6cb45e93 JG |
45 | sem_t ready; |
46 | bool running; | |
47 | } thread_state; | |
48 | ||
49 | static void set_thread_status(bool running) | |
917a718d | 50 | { |
6cb45e93 JG |
51 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
52 | thread_state.running = running; | |
53 | sem_post(&thread_state.ready); | |
917a718d JG |
54 | } |
55 | ||
6cb45e93 | 56 | static bool wait_thread_status(void) |
917a718d | 57 | { |
6cb45e93 JG |
58 | DBG("Waiting for client thread to be ready"); |
59 | sem_wait(&thread_state.ready); | |
60 | if (thread_state.running) { | |
61 | DBG("Client thread is ready"); | |
62 | } else { | |
63 | ERR("Initialization of client thread failed"); | |
917a718d | 64 | } |
6cb45e93 JG |
65 | |
66 | return thread_state.running; | |
917a718d JG |
67 | } |
68 | ||
69 | /* | |
70 | * Setup the outgoing data buffer for the response (llm) by allocating the | |
71 | * right amount of memory and copying the original information from the lsm | |
72 | * structure. | |
73 | * | |
74 | * Return 0 on success, negative value on error. | |
75 | */ | |
76 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, | |
77 | const void *payload_buf, size_t payload_len, | |
78 | const void *cmd_header_buf, size_t cmd_header_len) | |
79 | { | |
80 | int ret = 0; | |
81 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); | |
82 | const size_t cmd_header_offset = header_len; | |
83 | const size_t payload_offset = cmd_header_offset + cmd_header_len; | |
84 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; | |
85 | ||
99a98ed3 | 86 | free(cmd_ctx->llm); |
917a718d JG |
87 | cmd_ctx->llm = zmalloc(total_msg_size); |
88 | ||
89 | if (cmd_ctx->llm == NULL) { | |
90 | PERROR("zmalloc"); | |
91 | ret = -ENOMEM; | |
92 | goto end; | |
93 | } | |
94 | ||
95 | /* Copy common data */ | |
96 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
97 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; | |
98 | cmd_ctx->llm->cmd_header_size = cmd_header_len; | |
99 | cmd_ctx->llm->data_size = payload_len; | |
100 | cmd_ctx->lttng_msg_size = total_msg_size; | |
101 | ||
102 | /* Copy command header */ | |
103 | if (cmd_header_len) { | |
104 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, | |
105 | cmd_header_len); | |
106 | } | |
107 | ||
108 | /* Copy payload */ | |
109 | if (payload_len) { | |
110 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, | |
111 | payload_len); | |
112 | } | |
113 | ||
114 | end: | |
115 | return ret; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd | |
4ec029ed | 120 | * exec or it will fail. |
917a718d JG |
121 | */ |
122 | static int spawn_consumer_thread(struct consumer_data *consumer_data) | |
123 | { | |
4ec029ed | 124 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
917a718d JG |
125 | } |
126 | ||
127 | /* | |
128 | * Fork and exec a consumer daemon (consumerd). | |
129 | * | |
130 | * Return pid if successful else -1. | |
131 | */ | |
132 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) | |
133 | { | |
134 | int ret; | |
135 | pid_t pid; | |
136 | const char *consumer_to_use; | |
137 | const char *verbosity; | |
138 | struct stat st; | |
139 | ||
140 | DBG("Spawning consumerd"); | |
141 | ||
142 | pid = fork(); | |
143 | if (pid == 0) { | |
144 | /* | |
145 | * Exec consumerd. | |
146 | */ | |
147 | if (config.verbose_consumer) { | |
148 | verbosity = "--verbose"; | |
149 | } else if (lttng_opt_quiet) { | |
150 | verbosity = "--quiet"; | |
151 | } else { | |
152 | verbosity = ""; | |
153 | } | |
154 | ||
155 | switch (consumer_data->type) { | |
156 | case LTTNG_CONSUMER_KERNEL: | |
157 | /* | |
158 | * Find out which consumerd to execute. We will first try the | |
159 | * 64-bit path, then the sessiond's installation directory, and | |
160 | * fallback on the 32-bit one, | |
161 | */ | |
162 | DBG3("Looking for a kernel consumer at these locations:"); | |
163 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); | |
164 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); | |
165 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); | |
166 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { | |
167 | DBG3("Found location #1"); | |
168 | consumer_to_use = config.consumerd64_bin_path.value; | |
169 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { | |
170 | DBG3("Found location #2"); | |
171 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; | |
172 | } else if (config.consumerd32_bin_path.value && | |
173 | stat(config.consumerd32_bin_path.value, &st) == 0) { | |
174 | DBG3("Found location #3"); | |
175 | consumer_to_use = config.consumerd32_bin_path.value; | |
176 | } else { | |
177 | DBG("Could not find any valid consumerd executable"); | |
178 | ret = -EINVAL; | |
179 | goto error; | |
180 | } | |
181 | DBG("Using kernel consumer at: %s", consumer_to_use); | |
182 | (void) execl(consumer_to_use, | |
183 | "lttng-consumerd", verbosity, "-k", | |
184 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
185 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
186 | "--group", config.tracing_group_name.value, | |
187 | NULL); | |
188 | break; | |
189 | case LTTNG_CONSUMER64_UST: | |
190 | { | |
191 | if (config.consumerd64_lib_dir.value) { | |
192 | char *tmp; | |
193 | size_t tmplen; | |
194 | char *tmpnew; | |
195 | ||
196 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
197 | if (!tmp) { | |
198 | tmp = ""; | |
199 | } | |
200 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
201 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
202 | if (!tmpnew) { | |
203 | ret = -ENOMEM; | |
204 | goto error; | |
205 | } | |
206 | strcat(tmpnew, config.consumerd64_lib_dir.value); | |
207 | if (tmp[0] != '\0') { | |
208 | strcat(tmpnew, ":"); | |
209 | strcat(tmpnew, tmp); | |
210 | } | |
211 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
212 | free(tmpnew); | |
213 | if (ret) { | |
214 | ret = -errno; | |
215 | goto error; | |
216 | } | |
217 | } | |
218 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); | |
219 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
220 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
221 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
222 | "--group", config.tracing_group_name.value, | |
223 | NULL); | |
224 | break; | |
225 | } | |
226 | case LTTNG_CONSUMER32_UST: | |
227 | { | |
228 | if (config.consumerd32_lib_dir.value) { | |
229 | char *tmp; | |
230 | size_t tmplen; | |
231 | char *tmpnew; | |
232 | ||
233 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); | |
234 | if (!tmp) { | |
235 | tmp = ""; | |
236 | } | |
237 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); | |
238 | tmpnew = zmalloc(tmplen + 1 /* \0 */); | |
239 | if (!tmpnew) { | |
240 | ret = -ENOMEM; | |
241 | goto error; | |
242 | } | |
243 | strcat(tmpnew, config.consumerd32_lib_dir.value); | |
244 | if (tmp[0] != '\0') { | |
245 | strcat(tmpnew, ":"); | |
246 | strcat(tmpnew, tmp); | |
247 | } | |
248 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); | |
249 | free(tmpnew); | |
250 | if (ret) { | |
251 | ret = -errno; | |
252 | goto error; | |
253 | } | |
254 | } | |
255 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); | |
256 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", | |
257 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, | |
258 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, | |
259 | "--group", config.tracing_group_name.value, | |
260 | NULL); | |
261 | break; | |
262 | } | |
263 | default: | |
264 | ERR("unknown consumer type"); | |
265 | errno = 0; | |
266 | } | |
267 | if (errno != 0) { | |
268 | PERROR("Consumer execl()"); | |
269 | } | |
270 | /* Reaching this point, we got a failure on our execl(). */ | |
271 | exit(EXIT_FAILURE); | |
272 | } else if (pid > 0) { | |
273 | ret = pid; | |
274 | } else { | |
275 | PERROR("start consumer fork"); | |
276 | ret = -errno; | |
277 | } | |
278 | error: | |
279 | return ret; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Spawn the consumerd daemon and session daemon thread. | |
284 | */ | |
285 | static int start_consumerd(struct consumer_data *consumer_data) | |
286 | { | |
287 | int ret; | |
288 | ||
289 | /* | |
290 | * Set the listen() state on the socket since there is a possible race | |
291 | * between the exec() of the consumer daemon and this call if place in the | |
292 | * consumer thread. See bug #366 for more details. | |
293 | */ | |
294 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); | |
295 | if (ret < 0) { | |
296 | goto error; | |
297 | } | |
298 | ||
299 | pthread_mutex_lock(&consumer_data->pid_mutex); | |
300 | if (consumer_data->pid != 0) { | |
301 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
302 | goto end; | |
303 | } | |
304 | ||
305 | ret = spawn_consumerd(consumer_data); | |
306 | if (ret < 0) { | |
307 | ERR("Spawning consumerd failed"); | |
308 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
309 | goto error; | |
310 | } | |
311 | ||
312 | /* Setting up the consumer_data pid */ | |
313 | consumer_data->pid = ret; | |
314 | DBG2("Consumer pid %d", consumer_data->pid); | |
315 | pthread_mutex_unlock(&consumer_data->pid_mutex); | |
316 | ||
317 | DBG2("Spawning consumer control thread"); | |
318 | ret = spawn_consumer_thread(consumer_data); | |
319 | if (ret < 0) { | |
320 | ERR("Fatal error spawning consumer control thread"); | |
321 | goto error; | |
322 | } | |
323 | ||
324 | end: | |
325 | return 0; | |
326 | ||
327 | error: | |
328 | /* Cleanup already created sockets on error. */ | |
329 | if (consumer_data->err_sock >= 0) { | |
330 | int err; | |
331 | ||
332 | err = close(consumer_data->err_sock); | |
333 | if (err < 0) { | |
334 | PERROR("close consumer data error socket"); | |
335 | } | |
336 | } | |
337 | return ret; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Copy consumer output from the tracing session to the domain session. The | |
342 | * function also applies the right modification on a per domain basis for the | |
343 | * trace files destination directory. | |
344 | * | |
345 | * Should *NOT* be called with RCU read-side lock held. | |
346 | */ | |
347 | static int copy_session_consumer(int domain, struct ltt_session *session) | |
348 | { | |
349 | int ret; | |
350 | const char *dir_name; | |
351 | struct consumer_output *consumer; | |
352 | ||
353 | assert(session); | |
354 | assert(session->consumer); | |
355 | ||
356 | switch (domain) { | |
357 | case LTTNG_DOMAIN_KERNEL: | |
358 | DBG3("Copying tracing session consumer output in kernel session"); | |
359 | /* | |
360 | * XXX: We should audit the session creation and what this function | |
361 | * does "extra" in order to avoid a destroy since this function is used | |
362 | * in the domain session creation (kernel and ust) only. Same for UST | |
363 | * domain. | |
364 | */ | |
365 | if (session->kernel_session->consumer) { | |
366 | consumer_output_put(session->kernel_session->consumer); | |
367 | } | |
368 | session->kernel_session->consumer = | |
369 | consumer_copy_output(session->consumer); | |
370 | /* Ease our life a bit for the next part */ | |
371 | consumer = session->kernel_session->consumer; | |
372 | dir_name = DEFAULT_KERNEL_TRACE_DIR; | |
373 | break; | |
374 | case LTTNG_DOMAIN_JUL: | |
375 | case LTTNG_DOMAIN_LOG4J: | |
376 | case LTTNG_DOMAIN_PYTHON: | |
377 | case LTTNG_DOMAIN_UST: | |
378 | DBG3("Copying tracing session consumer output in UST session"); | |
379 | if (session->ust_session->consumer) { | |
380 | consumer_output_put(session->ust_session->consumer); | |
381 | } | |
382 | session->ust_session->consumer = | |
383 | consumer_copy_output(session->consumer); | |
384 | /* Ease our life a bit for the next part */ | |
385 | consumer = session->ust_session->consumer; | |
386 | dir_name = DEFAULT_UST_TRACE_DIR; | |
387 | break; | |
388 | default: | |
389 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
390 | goto error; | |
391 | } | |
392 | ||
393 | /* Append correct directory to subdir */ | |
b178f53e JG |
394 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
395 | sizeof(consumer->domain_subdir)); | |
396 | if (ret) { | |
397 | ret = LTTNG_ERR_UNK; | |
398 | goto error; | |
399 | } | |
400 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); | |
917a718d JG |
401 | ret = LTTNG_OK; |
402 | ||
403 | error: | |
404 | return ret; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Create an UST session and add it to the session ust list. | |
409 | * | |
410 | * Should *NOT* be called with RCU read-side lock held. | |
411 | */ | |
412 | static int create_ust_session(struct ltt_session *session, | |
df4f5a87 | 413 | const struct lttng_domain *domain) |
917a718d JG |
414 | { |
415 | int ret; | |
416 | struct ltt_ust_session *lus = NULL; | |
417 | ||
418 | assert(session); | |
419 | assert(domain); | |
420 | assert(session->consumer); | |
421 | ||
422 | switch (domain->type) { | |
423 | case LTTNG_DOMAIN_JUL: | |
424 | case LTTNG_DOMAIN_LOG4J: | |
425 | case LTTNG_DOMAIN_PYTHON: | |
426 | case LTTNG_DOMAIN_UST: | |
427 | break; | |
428 | default: | |
429 | ERR("Unknown UST domain on create session %d", domain->type); | |
430 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
431 | goto error; | |
432 | } | |
433 | ||
434 | DBG("Creating UST session"); | |
435 | ||
436 | lus = trace_ust_create_session(session->id); | |
437 | if (lus == NULL) { | |
438 | ret = LTTNG_ERR_UST_SESS_FAIL; | |
439 | goto error; | |
440 | } | |
441 | ||
442 | lus->uid = session->uid; | |
443 | lus->gid = session->gid; | |
444 | lus->output_traces = session->output_traces; | |
445 | lus->snapshot_mode = session->snapshot_mode; | |
446 | lus->live_timer_interval = session->live_timer; | |
447 | session->ust_session = lus; | |
448 | if (session->shm_path[0]) { | |
449 | strncpy(lus->root_shm_path, session->shm_path, | |
450 | sizeof(lus->root_shm_path)); | |
451 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; | |
452 | strncpy(lus->shm_path, session->shm_path, | |
453 | sizeof(lus->shm_path)); | |
454 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; | |
455 | strncat(lus->shm_path, "/ust", | |
456 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); | |
457 | } | |
458 | /* Copy session output to the newly created UST session */ | |
459 | ret = copy_session_consumer(domain->type, session); | |
460 | if (ret != LTTNG_OK) { | |
461 | goto error; | |
462 | } | |
463 | ||
464 | return LTTNG_OK; | |
465 | ||
466 | error: | |
467 | free(lus); | |
468 | session->ust_session = NULL; | |
469 | return ret; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Create a kernel tracer session then create the default channel. | |
474 | */ | |
475 | static int create_kernel_session(struct ltt_session *session) | |
476 | { | |
477 | int ret; | |
478 | ||
479 | DBG("Creating kernel session"); | |
480 | ||
7d268848 | 481 | ret = kernel_create_session(session); |
917a718d JG |
482 | if (ret < 0) { |
483 | ret = LTTNG_ERR_KERN_SESS_FAIL; | |
5d0a7bcb | 484 | goto error_create; |
917a718d JG |
485 | } |
486 | ||
487 | /* Code flow safety */ | |
488 | assert(session->kernel_session); | |
489 | ||
490 | /* Copy session output to the newly created Kernel session */ | |
491 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); | |
492 | if (ret != LTTNG_OK) { | |
493 | goto error; | |
494 | } | |
495 | ||
496 | session->kernel_session->uid = session->uid; | |
497 | session->kernel_session->gid = session->gid; | |
498 | session->kernel_session->output_traces = session->output_traces; | |
499 | session->kernel_session->snapshot_mode = session->snapshot_mode; | |
500 | ||
501 | return LTTNG_OK; | |
502 | ||
503 | error: | |
504 | trace_kernel_destroy_session(session->kernel_session); | |
505 | session->kernel_session = NULL; | |
5d0a7bcb | 506 | error_create: |
917a718d JG |
507 | return ret; |
508 | } | |
509 | ||
510 | /* | |
511 | * Count number of session permitted by uid/gid. | |
512 | */ | |
513 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) | |
514 | { | |
515 | unsigned int i = 0; | |
516 | struct ltt_session *session; | |
517 | const struct ltt_session_list *session_list = session_get_list(); | |
518 | ||
519 | DBG("Counting number of available session for UID %d GID %d", | |
520 | uid, gid); | |
521 | cds_list_for_each_entry(session, &session_list->head, list) { | |
522 | if (!session_get(session)) { | |
523 | continue; | |
524 | } | |
525 | session_lock(session); | |
526 | /* Only count the sessions the user can control. */ | |
527 | if (session_access_ok(session, uid, gid) && | |
528 | !session->destroyed) { | |
529 | i++; | |
530 | } | |
531 | session_unlock(session); | |
532 | session_put(session); | |
533 | } | |
534 | return i; | |
535 | } | |
536 | ||
537 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, | |
538 | int *sock_error, struct lttng_event *event) | |
539 | { | |
540 | int fd, ret; | |
541 | struct lttng_userspace_probe_location *probe_location; | |
542 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; | |
543 | struct lttng_dynamic_buffer probe_location_buffer; | |
544 | struct lttng_buffer_view buffer_view; | |
545 | ||
546 | /* | |
547 | * Create a buffer to store the serialized version of the probe | |
548 | * location. | |
549 | */ | |
550 | lttng_dynamic_buffer_init(&probe_location_buffer); | |
551 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, | |
552 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); | |
553 | if (ret) { | |
554 | ret = LTTNG_ERR_NOMEM; | |
555 | goto error; | |
556 | } | |
557 | ||
558 | /* | |
559 | * Receive the probe location. | |
560 | */ | |
561 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, | |
562 | probe_location_buffer.size); | |
563 | if (ret <= 0) { | |
564 | DBG("Nothing recv() from client var len data... continuing"); | |
565 | *sock_error = 1; | |
566 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
567 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
568 | goto error; | |
569 | } | |
570 | ||
571 | buffer_view = lttng_buffer_view_from_dynamic_buffer( | |
572 | &probe_location_buffer, 0, probe_location_buffer.size); | |
573 | ||
574 | /* | |
575 | * Extract the probe location from the serialized version. | |
576 | */ | |
577 | ret = lttng_userspace_probe_location_create_from_buffer( | |
578 | &buffer_view, &probe_location); | |
579 | if (ret < 0) { | |
580 | WARN("Failed to create a userspace probe location from the received buffer"); | |
581 | lttng_dynamic_buffer_reset( &probe_location_buffer); | |
582 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
583 | goto error; | |
584 | } | |
585 | ||
586 | /* | |
587 | * Receive the file descriptor to the target binary from the client. | |
588 | */ | |
589 | DBG("Receiving userspace probe target FD from client ..."); | |
590 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); | |
591 | if (ret <= 0) { | |
592 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
593 | *sock_error = 1; | |
594 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
595 | goto error; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Set the file descriptor received from the client through the unix | |
600 | * socket in the probe location. | |
601 | */ | |
602 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); | |
603 | if (!lookup) { | |
604 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
605 | goto error; | |
606 | } | |
607 | ||
608 | /* | |
609 | * From the kernel tracer's perspective, all userspace probe event types | |
610 | * are all the same: a file and an offset. | |
611 | */ | |
612 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { | |
613 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
614 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
615 | probe_location, fd); | |
616 | break; | |
617 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
618 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
619 | probe_location, fd); | |
620 | break; | |
621 | default: | |
622 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
623 | goto error; | |
624 | } | |
625 | ||
626 | if (ret) { | |
627 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
628 | goto error; | |
629 | } | |
630 | ||
631 | /* Attach the probe location to the event. */ | |
632 | ret = lttng_event_set_userspace_probe_location(event, probe_location); | |
633 | if (ret) { | |
634 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
635 | goto error; | |
636 | } | |
637 | ||
638 | lttng_dynamic_buffer_reset(&probe_location_buffer); | |
639 | error: | |
640 | return ret; | |
641 | } | |
642 | ||
917a718d JG |
643 | /* |
644 | * Version of setup_lttng_msg() without command header. | |
645 | */ | |
646 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, | |
647 | void *payload_buf, size_t payload_len) | |
648 | { | |
649 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); | |
650 | } | |
651 | ||
652 | /* | |
653 | * Free memory of a command context structure. | |
654 | */ | |
655 | static void clean_command_ctx(struct command_ctx **cmd_ctx) | |
656 | { | |
657 | DBG("Clean command context structure"); | |
658 | if (*cmd_ctx) { | |
659 | if ((*cmd_ctx)->llm) { | |
660 | free((*cmd_ctx)->llm); | |
661 | } | |
662 | if ((*cmd_ctx)->lsm) { | |
663 | free((*cmd_ctx)->lsm); | |
664 | } | |
665 | free(*cmd_ctx); | |
666 | *cmd_ctx = NULL; | |
667 | } | |
668 | } | |
669 | ||
670 | /* | |
671 | * Check if the current kernel tracer supports the session rotation feature. | |
672 | * Return 1 if it does, 0 otherwise. | |
673 | */ | |
674 | static int check_rotate_compatible(void) | |
675 | { | |
676 | int ret = 1; | |
677 | ||
678 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { | |
679 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
680 | ret = 0; | |
681 | } | |
682 | ||
683 | return ret; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Send data on a unix socket using the liblttsessiondcomm API. | |
688 | * | |
689 | * Return lttcomm error code. | |
690 | */ | |
691 | static int send_unix_sock(int sock, void *buf, size_t len) | |
692 | { | |
693 | /* Check valid length */ | |
694 | if (len == 0) { | |
695 | return -1; | |
696 | } | |
697 | ||
698 | return lttcomm_send_unix_sock(sock, buf, len); | |
699 | } | |
700 | ||
701 | /* | |
702 | * Process the command requested by the lttng client within the command | |
703 | * context structure. This function make sure that the return structure (llm) | |
704 | * is set and ready for transmission before returning. | |
705 | * | |
706 | * Return any error encountered or 0 for success. | |
707 | * | |
708 | * "sock" is only used for special-case var. len data. | |
3e3665b8 JG |
709 | * A command may assume the ownership of the socket, in which case its value |
710 | * should be set to -1. | |
917a718d JG |
711 | * |
712 | * Should *NOT* be called with RCU read-side lock held. | |
713 | */ | |
3e3665b8 | 714 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
917a718d JG |
715 | int *sock_error) |
716 | { | |
717 | int ret = LTTNG_OK; | |
718 | int need_tracing_session = 1; | |
719 | int need_domain; | |
720 | ||
721 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); | |
722 | ||
723 | assert(!rcu_read_ongoing()); | |
724 | ||
725 | *sock_error = 0; | |
726 | ||
727 | switch (cmd_ctx->lsm->cmd_type) { | |
b178f53e | 728 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
729 | case LTTNG_DESTROY_SESSION: |
730 | case LTTNG_LIST_SESSIONS: | |
731 | case LTTNG_LIST_DOMAINS: | |
732 | case LTTNG_START_TRACE: | |
733 | case LTTNG_STOP_TRACE: | |
734 | case LTTNG_DATA_PENDING: | |
735 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
736 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
737 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
738 | case LTTNG_SNAPSHOT_RECORD: | |
739 | case LTTNG_SAVE_SESSION: | |
740 | case LTTNG_SET_SESSION_SHM_PATH: | |
741 | case LTTNG_REGENERATE_METADATA: | |
742 | case LTTNG_REGENERATE_STATEDUMP: | |
743 | case LTTNG_REGISTER_TRIGGER: | |
744 | case LTTNG_UNREGISTER_TRIGGER: | |
745 | case LTTNG_ROTATE_SESSION: | |
746 | case LTTNG_ROTATION_GET_INFO: | |
747 | case LTTNG_ROTATION_SET_SCHEDULE: | |
748 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
749 | need_domain = 0; | |
750 | break; | |
751 | default: | |
752 | need_domain = 1; | |
753 | } | |
754 | ||
755 | if (config.no_kernel && need_domain | |
756 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { | |
757 | if (!is_root) { | |
758 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
759 | } else { | |
760 | ret = LTTNG_ERR_KERN_NA; | |
761 | } | |
762 | goto error; | |
763 | } | |
764 | ||
765 | /* Deny register consumer if we already have a spawned consumer. */ | |
766 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { | |
767 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
768 | if (kconsumer_data.pid > 0) { | |
769 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
770 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
771 | goto error; | |
772 | } | |
773 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
774 | } | |
775 | ||
776 | /* | |
777 | * Check for command that don't needs to allocate a returned payload. We do | |
778 | * this here so we don't have to make the call for no payload at each | |
779 | * command. | |
780 | */ | |
781 | switch(cmd_ctx->lsm->cmd_type) { | |
782 | case LTTNG_LIST_SESSIONS: | |
783 | case LTTNG_LIST_TRACEPOINTS: | |
784 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
785 | case LTTNG_LIST_DOMAINS: | |
786 | case LTTNG_LIST_CHANNELS: | |
787 | case LTTNG_LIST_EVENTS: | |
788 | case LTTNG_LIST_SYSCALLS: | |
789 | case LTTNG_LIST_TRACKER_PIDS: | |
790 | case LTTNG_DATA_PENDING: | |
791 | case LTTNG_ROTATE_SESSION: | |
792 | case LTTNG_ROTATION_GET_INFO: | |
793 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
794 | break; | |
795 | default: | |
796 | /* Setup lttng message with no payload */ | |
797 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); | |
798 | if (ret < 0) { | |
799 | /* This label does not try to unlock the session */ | |
800 | goto init_setup_error; | |
801 | } | |
802 | } | |
803 | ||
804 | /* Commands that DO NOT need a session. */ | |
805 | switch (cmd_ctx->lsm->cmd_type) { | |
b178f53e | 806 | case LTTNG_CREATE_SESSION_EXT: |
917a718d JG |
807 | case LTTNG_LIST_SESSIONS: |
808 | case LTTNG_LIST_TRACEPOINTS: | |
809 | case LTTNG_LIST_SYSCALLS: | |
810 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
811 | case LTTNG_SAVE_SESSION: | |
812 | case LTTNG_REGISTER_TRIGGER: | |
813 | case LTTNG_UNREGISTER_TRIGGER: | |
814 | need_tracing_session = 0; | |
815 | break; | |
816 | default: | |
817 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); | |
818 | /* | |
819 | * We keep the session list lock across _all_ commands | |
820 | * for now, because the per-session lock does not | |
821 | * handle teardown properly. | |
822 | */ | |
823 | session_lock_list(); | |
824 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); | |
825 | if (cmd_ctx->session == NULL) { | |
826 | ret = LTTNG_ERR_SESS_NOT_FOUND; | |
827 | goto error; | |
828 | } else { | |
829 | /* Acquire lock for the session */ | |
830 | session_lock(cmd_ctx->session); | |
831 | } | |
832 | break; | |
833 | } | |
834 | ||
835 | /* | |
836 | * Commands that need a valid session but should NOT create one if none | |
837 | * exists. Instead of creating one and destroying it when the command is | |
838 | * handled, process that right before so we save some round trip in useless | |
839 | * code path. | |
840 | */ | |
841 | switch (cmd_ctx->lsm->cmd_type) { | |
842 | case LTTNG_DISABLE_CHANNEL: | |
843 | case LTTNG_DISABLE_EVENT: | |
844 | switch (cmd_ctx->lsm->domain.type) { | |
845 | case LTTNG_DOMAIN_KERNEL: | |
846 | if (!cmd_ctx->session->kernel_session) { | |
847 | ret = LTTNG_ERR_NO_CHANNEL; | |
848 | goto error; | |
849 | } | |
850 | break; | |
851 | case LTTNG_DOMAIN_JUL: | |
852 | case LTTNG_DOMAIN_LOG4J: | |
853 | case LTTNG_DOMAIN_PYTHON: | |
854 | case LTTNG_DOMAIN_UST: | |
855 | if (!cmd_ctx->session->ust_session) { | |
856 | ret = LTTNG_ERR_NO_CHANNEL; | |
857 | goto error; | |
858 | } | |
859 | break; | |
860 | default: | |
861 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
862 | goto error; | |
863 | } | |
864 | default: | |
865 | break; | |
866 | } | |
867 | ||
868 | if (!need_domain) { | |
869 | goto skip_domain; | |
870 | } | |
871 | ||
872 | /* | |
873 | * Check domain type for specific "pre-action". | |
874 | */ | |
875 | switch (cmd_ctx->lsm->domain.type) { | |
876 | case LTTNG_DOMAIN_KERNEL: | |
877 | if (!is_root) { | |
878 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; | |
879 | goto error; | |
880 | } | |
881 | ||
7d268848 MD |
882 | /* Kernel tracer check */ |
883 | if (!kernel_tracer_is_initialized()) { | |
884 | /* Basically, load kernel tracer modules */ | |
885 | ret = init_kernel_tracer(); | |
886 | if (ret != 0) { | |
887 | goto error; | |
888 | } | |
889 | } | |
890 | ||
917a718d JG |
891 | /* Consumer is in an ERROR state. Report back to client */ |
892 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { | |
893 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
894 | goto error; | |
895 | } | |
896 | ||
897 | /* Need a session for kernel command */ | |
898 | if (need_tracing_session) { | |
899 | if (cmd_ctx->session->kernel_session == NULL) { | |
900 | ret = create_kernel_session(cmd_ctx->session); | |
51630bd8 | 901 | if (ret != LTTNG_OK) { |
917a718d JG |
902 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
903 | goto error; | |
904 | } | |
905 | } | |
906 | ||
907 | /* Start the kernel consumer daemon */ | |
908 | pthread_mutex_lock(&kconsumer_data.pid_mutex); | |
909 | if (kconsumer_data.pid == 0 && | |
910 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
911 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
912 | ret = start_consumerd(&kconsumer_data); | |
913 | if (ret < 0) { | |
914 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; | |
915 | goto error; | |
916 | } | |
917 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); | |
918 | } else { | |
919 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); | |
920 | } | |
921 | ||
922 | /* | |
923 | * The consumer was just spawned so we need to add the socket to | |
924 | * the consumer output of the session if exist. | |
925 | */ | |
926 | ret = consumer_create_socket(&kconsumer_data, | |
927 | cmd_ctx->session->kernel_session->consumer); | |
928 | if (ret < 0) { | |
929 | goto error; | |
930 | } | |
931 | } | |
932 | ||
933 | break; | |
934 | case LTTNG_DOMAIN_JUL: | |
935 | case LTTNG_DOMAIN_LOG4J: | |
936 | case LTTNG_DOMAIN_PYTHON: | |
937 | case LTTNG_DOMAIN_UST: | |
938 | { | |
939 | if (!ust_app_supported()) { | |
940 | ret = LTTNG_ERR_NO_UST; | |
941 | goto error; | |
942 | } | |
943 | /* Consumer is in an ERROR state. Report back to client */ | |
944 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { | |
945 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
946 | goto error; | |
947 | } | |
948 | ||
949 | if (need_tracing_session) { | |
950 | /* Create UST session if none exist. */ | |
951 | if (cmd_ctx->session->ust_session == NULL) { | |
952 | ret = create_ust_session(cmd_ctx->session, | |
df4f5a87 | 953 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain)); |
917a718d JG |
954 | if (ret != LTTNG_OK) { |
955 | goto error; | |
956 | } | |
957 | } | |
958 | ||
959 | /* Start the UST consumer daemons */ | |
960 | /* 64-bit */ | |
961 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); | |
962 | if (config.consumerd64_bin_path.value && | |
963 | ustconsumer64_data.pid == 0 && | |
964 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
965 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
966 | ret = start_consumerd(&ustconsumer64_data); | |
967 | if (ret < 0) { | |
968 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; | |
969 | uatomic_set(&ust_consumerd64_fd, -EINVAL); | |
970 | goto error; | |
971 | } | |
972 | ||
973 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); | |
974 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
975 | } else { | |
976 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); | |
977 | } | |
978 | ||
979 | /* | |
980 | * Setup socket for consumer 64 bit. No need for atomic access | |
981 | * since it was set above and can ONLY be set in this thread. | |
982 | */ | |
983 | ret = consumer_create_socket(&ustconsumer64_data, | |
984 | cmd_ctx->session->ust_session->consumer); | |
985 | if (ret < 0) { | |
986 | goto error; | |
987 | } | |
988 | ||
989 | /* 32-bit */ | |
990 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); | |
991 | if (config.consumerd32_bin_path.value && | |
992 | ustconsumer32_data.pid == 0 && | |
993 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
994 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
995 | ret = start_consumerd(&ustconsumer32_data); | |
996 | if (ret < 0) { | |
997 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; | |
998 | uatomic_set(&ust_consumerd32_fd, -EINVAL); | |
999 | goto error; | |
1000 | } | |
1001 | ||
1002 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); | |
1003 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); | |
1004 | } else { | |
1005 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Setup socket for consumer 32 bit. No need for atomic access | |
1010 | * since it was set above and can ONLY be set in this thread. | |
1011 | */ | |
1012 | ret = consumer_create_socket(&ustconsumer32_data, | |
1013 | cmd_ctx->session->ust_session->consumer); | |
1014 | if (ret < 0) { | |
1015 | goto error; | |
1016 | } | |
1017 | } | |
1018 | break; | |
1019 | } | |
1020 | default: | |
1021 | break; | |
1022 | } | |
1023 | skip_domain: | |
1024 | ||
1025 | /* Validate consumer daemon state when start/stop trace command */ | |
1026 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || | |
1027 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { | |
1028 | switch (cmd_ctx->lsm->domain.type) { | |
1029 | case LTTNG_DOMAIN_NONE: | |
1030 | break; | |
1031 | case LTTNG_DOMAIN_JUL: | |
1032 | case LTTNG_DOMAIN_LOG4J: | |
1033 | case LTTNG_DOMAIN_PYTHON: | |
1034 | case LTTNG_DOMAIN_UST: | |
1035 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { | |
1036 | ret = LTTNG_ERR_NO_USTCONSUMERD; | |
1037 | goto error; | |
1038 | } | |
1039 | break; | |
1040 | case LTTNG_DOMAIN_KERNEL: | |
1041 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { | |
1042 | ret = LTTNG_ERR_NO_KERNCONSUMERD; | |
1043 | goto error; | |
1044 | } | |
1045 | break; | |
1046 | default: | |
1047 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; | |
1048 | goto error; | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Check that the UID or GID match that of the tracing session. | |
1054 | * The root user can interact with all sessions. | |
1055 | */ | |
1056 | if (need_tracing_session) { | |
1057 | if (!session_access_ok(cmd_ctx->session, | |
1058 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1059 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || | |
1060 | cmd_ctx->session->destroyed) { | |
1061 | ret = LTTNG_ERR_EPERM; | |
1062 | goto error; | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Send relayd information to consumer as soon as we have a domain and a | |
1068 | * session defined. | |
1069 | */ | |
1070 | if (cmd_ctx->session && need_domain) { | |
1071 | /* | |
1072 | * Setup relayd if not done yet. If the relayd information was already | |
1073 | * sent to the consumer, this call will gracefully return. | |
1074 | */ | |
1075 | ret = cmd_setup_relayd(cmd_ctx->session); | |
1076 | if (ret != LTTNG_OK) { | |
1077 | goto error; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | /* Process by command type */ | |
1082 | switch (cmd_ctx->lsm->cmd_type) { | |
1083 | case LTTNG_ADD_CONTEXT: | |
1084 | { | |
1085 | /* | |
1086 | * An LTTNG_ADD_CONTEXT command might have a supplementary | |
1087 | * payload if the context being added is an application context. | |
1088 | */ | |
1089 | if (cmd_ctx->lsm->u.context.ctx.ctx == | |
1090 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1091 | char *provider_name = NULL, *context_name = NULL; | |
1092 | size_t provider_name_len = | |
1093 | cmd_ctx->lsm->u.context.provider_name_len; | |
1094 | size_t context_name_len = | |
1095 | cmd_ctx->lsm->u.context.context_name_len; | |
1096 | ||
1097 | if (provider_name_len == 0 || context_name_len == 0) { | |
1098 | /* | |
1099 | * Application provider and context names MUST | |
1100 | * be provided. | |
1101 | */ | |
1102 | ret = -LTTNG_ERR_INVALID; | |
1103 | goto error; | |
1104 | } | |
1105 | ||
1106 | provider_name = zmalloc(provider_name_len + 1); | |
1107 | if (!provider_name) { | |
1108 | ret = -LTTNG_ERR_NOMEM; | |
1109 | goto error; | |
1110 | } | |
1111 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = | |
1112 | provider_name; | |
1113 | ||
1114 | context_name = zmalloc(context_name_len + 1); | |
1115 | if (!context_name) { | |
1116 | ret = -LTTNG_ERR_NOMEM; | |
1117 | goto error_add_context; | |
1118 | } | |
1119 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = | |
1120 | context_name; | |
1121 | ||
3e3665b8 | 1122 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
917a718d JG |
1123 | provider_name_len); |
1124 | if (ret < 0) { | |
1125 | goto error_add_context; | |
1126 | } | |
1127 | ||
3e3665b8 | 1128 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
917a718d JG |
1129 | context_name_len); |
1130 | if (ret < 0) { | |
1131 | goto error_add_context; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * cmd_add_context assumes ownership of the provider and context | |
1137 | * names. | |
1138 | */ | |
1139 | ret = cmd_add_context(cmd_ctx->session, | |
1140 | cmd_ctx->lsm->domain.type, | |
1141 | cmd_ctx->lsm->u.context.channel_name, | |
df4f5a87 | 1142 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.context.ctx), |
917a718d JG |
1143 | kernel_poll_pipe[1]); |
1144 | ||
1145 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; | |
1146 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; | |
1147 | error_add_context: | |
1148 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); | |
1149 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); | |
1150 | if (ret < 0) { | |
1151 | goto error; | |
1152 | } | |
1153 | break; | |
1154 | } | |
1155 | case LTTNG_DISABLE_CHANNEL: | |
1156 | { | |
1157 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1158 | cmd_ctx->lsm->u.disable.channel_name); | |
1159 | break; | |
1160 | } | |
1161 | case LTTNG_DISABLE_EVENT: | |
1162 | { | |
1163 | ||
1164 | /* | |
1165 | * FIXME: handle filter; for now we just receive the filter's | |
1166 | * bytecode along with the filter expression which are sent by | |
1167 | * liblttng-ctl and discard them. | |
1168 | * | |
1169 | * This fixes an issue where the client may block while sending | |
1170 | * the filter payload and encounter an error because the session | |
1171 | * daemon closes the socket without ever handling this data. | |
1172 | */ | |
1173 | size_t count = cmd_ctx->lsm->u.disable.expression_len + | |
1174 | cmd_ctx->lsm->u.disable.bytecode_len; | |
1175 | ||
1176 | if (count) { | |
1177 | char data[LTTNG_FILTER_MAX_LEN]; | |
1178 | ||
1179 | DBG("Discarding disable event command payload of size %zu", count); | |
1180 | while (count) { | |
3e3665b8 | 1181 | ret = lttcomm_recv_unix_sock(*sock, data, |
917a718d JG |
1182 | count > sizeof(data) ? sizeof(data) : count); |
1183 | if (ret < 0) { | |
1184 | goto error; | |
1185 | } | |
1186 | ||
1187 | count -= (size_t) ret; | |
1188 | } | |
1189 | } | |
917a718d JG |
1190 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
1191 | cmd_ctx->lsm->u.disable.channel_name, | |
df4f5a87 | 1192 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.disable.event)); |
917a718d JG |
1193 | break; |
1194 | } | |
1195 | case LTTNG_ENABLE_CHANNEL: | |
1196 | { | |
1197 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = | |
1198 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; | |
df4f5a87 JG |
1199 | ret = cmd_enable_channel(cmd_ctx->session, |
1200 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), | |
1201 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.channel.chan), | |
917a718d JG |
1202 | kernel_poll_pipe[1]); |
1203 | break; | |
1204 | } | |
1205 | case LTTNG_TRACK_PID: | |
1206 | { | |
1207 | ret = cmd_track_pid(cmd_ctx->session, | |
1208 | cmd_ctx->lsm->domain.type, | |
1209 | cmd_ctx->lsm->u.pid_tracker.pid); | |
1210 | break; | |
1211 | } | |
1212 | case LTTNG_UNTRACK_PID: | |
1213 | { | |
1214 | ret = cmd_untrack_pid(cmd_ctx->session, | |
1215 | cmd_ctx->lsm->domain.type, | |
1216 | cmd_ctx->lsm->u.pid_tracker.pid); | |
1217 | break; | |
1218 | } | |
1219 | case LTTNG_ENABLE_EVENT: | |
1220 | { | |
1221 | struct lttng_event *ev = NULL; | |
1222 | struct lttng_event_exclusion *exclusion = NULL; | |
1223 | struct lttng_filter_bytecode *bytecode = NULL; | |
1224 | char *filter_expression = NULL; | |
1225 | ||
1226 | /* Handle exclusion events and receive it from the client. */ | |
1227 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { | |
1228 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; | |
1229 | ||
1230 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + | |
1231 | (count * LTTNG_SYMBOL_NAME_LEN)); | |
1232 | if (!exclusion) { | |
1233 | ret = LTTNG_ERR_EXCLUSION_NOMEM; | |
1234 | goto error; | |
1235 | } | |
1236 | ||
1237 | DBG("Receiving var len exclusion event list from client ..."); | |
1238 | exclusion->count = count; | |
3e3665b8 | 1239 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
917a718d JG |
1240 | count * LTTNG_SYMBOL_NAME_LEN); |
1241 | if (ret <= 0) { | |
1242 | DBG("Nothing recv() from client var len data... continuing"); | |
1243 | *sock_error = 1; | |
1244 | free(exclusion); | |
1245 | ret = LTTNG_ERR_EXCLUSION_INVAL; | |
1246 | goto error; | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | /* Get filter expression from client. */ | |
1251 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { | |
1252 | size_t expression_len = | |
1253 | cmd_ctx->lsm->u.enable.expression_len; | |
1254 | ||
1255 | if (expression_len > LTTNG_FILTER_MAX_LEN) { | |
1256 | ret = LTTNG_ERR_FILTER_INVAL; | |
1257 | free(exclusion); | |
1258 | goto error; | |
1259 | } | |
1260 | ||
1261 | filter_expression = zmalloc(expression_len); | |
1262 | if (!filter_expression) { | |
1263 | free(exclusion); | |
1264 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1265 | goto error; | |
1266 | } | |
1267 | ||
1268 | /* Receive var. len. data */ | |
1269 | DBG("Receiving var len filter's expression from client ..."); | |
3e3665b8 | 1270 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
917a718d JG |
1271 | expression_len); |
1272 | if (ret <= 0) { | |
1273 | DBG("Nothing recv() from client var len data... continuing"); | |
1274 | *sock_error = 1; | |
1275 | free(filter_expression); | |
1276 | free(exclusion); | |
1277 | ret = LTTNG_ERR_FILTER_INVAL; | |
1278 | goto error; | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | /* Handle filter and get bytecode from client. */ | |
1283 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { | |
1284 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; | |
1285 | ||
1286 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { | |
1287 | ret = LTTNG_ERR_FILTER_INVAL; | |
1288 | free(filter_expression); | |
1289 | free(exclusion); | |
1290 | goto error; | |
1291 | } | |
1292 | ||
1293 | bytecode = zmalloc(bytecode_len); | |
1294 | if (!bytecode) { | |
1295 | free(filter_expression); | |
1296 | free(exclusion); | |
1297 | ret = LTTNG_ERR_FILTER_NOMEM; | |
1298 | goto error; | |
1299 | } | |
1300 | ||
1301 | /* Receive var. len. data */ | |
1302 | DBG("Receiving var len filter's bytecode from client ..."); | |
3e3665b8 | 1303 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
917a718d JG |
1304 | if (ret <= 0) { |
1305 | DBG("Nothing recv() from client var len data... continuing"); | |
1306 | *sock_error = 1; | |
1307 | free(filter_expression); | |
1308 | free(bytecode); | |
1309 | free(exclusion); | |
1310 | ret = LTTNG_ERR_FILTER_INVAL; | |
1311 | goto error; | |
1312 | } | |
1313 | ||
1314 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { | |
1315 | free(filter_expression); | |
1316 | free(bytecode); | |
1317 | free(exclusion); | |
1318 | ret = LTTNG_ERR_FILTER_INVAL; | |
1319 | goto error; | |
1320 | } | |
1321 | } | |
1322 | ||
df4f5a87 | 1323 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm->u.enable.event)); |
917a718d JG |
1324 | if (!ev) { |
1325 | DBG("Failed to copy event: %s", | |
1326 | cmd_ctx->lsm->u.enable.event.name); | |
1327 | free(filter_expression); | |
1328 | free(bytecode); | |
1329 | free(exclusion); | |
1330 | ret = LTTNG_ERR_NOMEM; | |
1331 | goto error; | |
1332 | } | |
1333 | ||
1334 | ||
1335 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { | |
1336 | /* Expect a userspace probe description. */ | |
3e3665b8 | 1337 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
917a718d JG |
1338 | if (ret) { |
1339 | free(filter_expression); | |
1340 | free(bytecode); | |
1341 | free(exclusion); | |
1342 | lttng_event_destroy(ev); | |
1343 | goto error; | |
1344 | } | |
1345 | } | |
1346 | ||
df4f5a87 JG |
1347 | ret = cmd_enable_event(cmd_ctx->session, |
1348 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), | |
917a718d JG |
1349 | cmd_ctx->lsm->u.enable.channel_name, |
1350 | ev, | |
1351 | filter_expression, bytecode, exclusion, | |
1352 | kernel_poll_pipe[1]); | |
1353 | lttng_event_destroy(ev); | |
1354 | break; | |
1355 | } | |
1356 | case LTTNG_LIST_TRACEPOINTS: | |
1357 | { | |
1358 | struct lttng_event *events; | |
1359 | ssize_t nb_events; | |
1360 | ||
1361 | session_lock_list(); | |
1362 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); | |
1363 | session_unlock_list(); | |
1364 | if (nb_events < 0) { | |
1365 | /* Return value is a negative lttng_error_code. */ | |
1366 | ret = -nb_events; | |
1367 | goto error; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * Setup lttng message with payload size set to the event list size in | |
1372 | * bytes and then copy list into the llm payload. | |
1373 | */ | |
1374 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1375 | sizeof(struct lttng_event) * nb_events); | |
1376 | free(events); | |
1377 | ||
1378 | if (ret < 0) { | |
1379 | goto setup_error; | |
1380 | } | |
1381 | ||
1382 | ret = LTTNG_OK; | |
1383 | break; | |
1384 | } | |
1385 | case LTTNG_LIST_TRACEPOINT_FIELDS: | |
1386 | { | |
1387 | struct lttng_event_field *fields; | |
1388 | ssize_t nb_fields; | |
1389 | ||
1390 | session_lock_list(); | |
1391 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, | |
1392 | &fields); | |
1393 | session_unlock_list(); | |
1394 | if (nb_fields < 0) { | |
1395 | /* Return value is a negative lttng_error_code. */ | |
1396 | ret = -nb_fields; | |
1397 | goto error; | |
1398 | } | |
1399 | ||
1400 | /* | |
1401 | * Setup lttng message with payload size set to the event list size in | |
1402 | * bytes and then copy list into the llm payload. | |
1403 | */ | |
1404 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, | |
1405 | sizeof(struct lttng_event_field) * nb_fields); | |
1406 | free(fields); | |
1407 | ||
1408 | if (ret < 0) { | |
1409 | goto setup_error; | |
1410 | } | |
1411 | ||
1412 | ret = LTTNG_OK; | |
1413 | break; | |
1414 | } | |
1415 | case LTTNG_LIST_SYSCALLS: | |
1416 | { | |
1417 | struct lttng_event *events; | |
1418 | ssize_t nb_events; | |
1419 | ||
1420 | nb_events = cmd_list_syscalls(&events); | |
1421 | if (nb_events < 0) { | |
1422 | /* Return value is a negative lttng_error_code. */ | |
1423 | ret = -nb_events; | |
1424 | goto error; | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * Setup lttng message with payload size set to the event list size in | |
1429 | * bytes and then copy list into the llm payload. | |
1430 | */ | |
1431 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, | |
1432 | sizeof(struct lttng_event) * nb_events); | |
1433 | free(events); | |
1434 | ||
1435 | if (ret < 0) { | |
1436 | goto setup_error; | |
1437 | } | |
1438 | ||
1439 | ret = LTTNG_OK; | |
1440 | break; | |
1441 | } | |
1442 | case LTTNG_LIST_TRACKER_PIDS: | |
1443 | { | |
1444 | int32_t *pids = NULL; | |
1445 | ssize_t nr_pids; | |
1446 | ||
1447 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, | |
1448 | cmd_ctx->lsm->domain.type, &pids); | |
1449 | if (nr_pids < 0) { | |
1450 | /* Return value is a negative lttng_error_code. */ | |
1451 | ret = -nr_pids; | |
1452 | goto error; | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * Setup lttng message with payload size set to the event list size in | |
1457 | * bytes and then copy list into the llm payload. | |
1458 | */ | |
1459 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, | |
1460 | sizeof(int32_t) * nr_pids); | |
1461 | free(pids); | |
1462 | ||
1463 | if (ret < 0) { | |
1464 | goto setup_error; | |
1465 | } | |
1466 | ||
1467 | ret = LTTNG_OK; | |
1468 | break; | |
1469 | } | |
1470 | case LTTNG_SET_CONSUMER_URI: | |
1471 | { | |
1472 | size_t nb_uri, len; | |
1473 | struct lttng_uri *uris; | |
1474 | ||
1475 | nb_uri = cmd_ctx->lsm->u.uri.size; | |
1476 | len = nb_uri * sizeof(struct lttng_uri); | |
1477 | ||
1478 | if (nb_uri == 0) { | |
1479 | ret = LTTNG_ERR_INVALID; | |
1480 | goto error; | |
1481 | } | |
1482 | ||
1483 | uris = zmalloc(len); | |
1484 | if (uris == NULL) { | |
1485 | ret = LTTNG_ERR_FATAL; | |
1486 | goto error; | |
1487 | } | |
1488 | ||
1489 | /* Receive variable len data */ | |
1490 | DBG("Receiving %zu URI(s) from client ...", nb_uri); | |
3e3665b8 | 1491 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
917a718d JG |
1492 | if (ret <= 0) { |
1493 | DBG("No URIs received from client... continuing"); | |
1494 | *sock_error = 1; | |
1495 | ret = LTTNG_ERR_SESSION_FAIL; | |
1496 | free(uris); | |
1497 | goto error; | |
1498 | } | |
1499 | ||
1500 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); | |
1501 | free(uris); | |
1502 | if (ret != LTTNG_OK) { | |
1503 | goto error; | |
1504 | } | |
1505 | ||
1506 | ||
1507 | break; | |
1508 | } | |
1509 | case LTTNG_START_TRACE: | |
1510 | { | |
1511 | /* | |
1512 | * On the first start, if we have a kernel session and we have | |
1513 | * enabled time or size-based rotations, we have to make sure | |
1514 | * the kernel tracer supports it. | |
1515 | */ | |
1516 | if (!cmd_ctx->session->has_been_started && \ | |
1517 | cmd_ctx->session->kernel_session && \ | |
1518 | (cmd_ctx->session->rotate_timer_period || \ | |
1519 | cmd_ctx->session->rotate_size) && \ | |
1520 | !check_rotate_compatible()) { | |
1521 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1522 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1523 | goto error; | |
1524 | } | |
1525 | ret = cmd_start_trace(cmd_ctx->session); | |
1526 | break; | |
1527 | } | |
1528 | case LTTNG_STOP_TRACE: | |
1529 | { | |
1530 | ret = cmd_stop_trace(cmd_ctx->session); | |
1531 | break; | |
1532 | } | |
917a718d JG |
1533 | case LTTNG_DESTROY_SESSION: |
1534 | { | |
1535 | ret = cmd_destroy_session(cmd_ctx->session, | |
3e3665b8 JG |
1536 | notification_thread_handle, |
1537 | sock); | |
917a718d JG |
1538 | break; |
1539 | } | |
1540 | case LTTNG_LIST_DOMAINS: | |
1541 | { | |
1542 | ssize_t nb_dom; | |
1543 | struct lttng_domain *domains = NULL; | |
1544 | ||
1545 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); | |
1546 | if (nb_dom < 0) { | |
1547 | /* Return value is a negative lttng_error_code. */ | |
1548 | ret = -nb_dom; | |
1549 | goto error; | |
1550 | } | |
1551 | ||
1552 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, | |
1553 | nb_dom * sizeof(struct lttng_domain)); | |
1554 | free(domains); | |
1555 | ||
1556 | if (ret < 0) { | |
1557 | goto setup_error; | |
1558 | } | |
1559 | ||
1560 | ret = LTTNG_OK; | |
1561 | break; | |
1562 | } | |
1563 | case LTTNG_LIST_CHANNELS: | |
1564 | { | |
1565 | ssize_t payload_size; | |
1566 | struct lttng_channel *channels = NULL; | |
1567 | ||
1568 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, | |
1569 | cmd_ctx->session, &channels); | |
1570 | if (payload_size < 0) { | |
1571 | /* Return value is a negative lttng_error_code. */ | |
1572 | ret = -payload_size; | |
1573 | goto error; | |
1574 | } | |
1575 | ||
1576 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, | |
1577 | payload_size); | |
1578 | free(channels); | |
1579 | ||
1580 | if (ret < 0) { | |
1581 | goto setup_error; | |
1582 | } | |
1583 | ||
1584 | ret = LTTNG_OK; | |
1585 | break; | |
1586 | } | |
1587 | case LTTNG_LIST_EVENTS: | |
1588 | { | |
1589 | ssize_t nb_event; | |
1590 | struct lttng_event *events = NULL; | |
1591 | struct lttcomm_event_command_header cmd_header; | |
1592 | size_t total_size; | |
1593 | ||
1594 | memset(&cmd_header, 0, sizeof(cmd_header)); | |
1595 | /* Extended infos are included at the end of events */ | |
1596 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, | |
1597 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, | |
1598 | &events, &total_size); | |
1599 | ||
1600 | if (nb_event < 0) { | |
1601 | /* Return value is a negative lttng_error_code. */ | |
1602 | ret = -nb_event; | |
1603 | goto error; | |
1604 | } | |
1605 | ||
1606 | cmd_header.nb_events = nb_event; | |
1607 | ret = setup_lttng_msg(cmd_ctx, events, total_size, | |
1608 | &cmd_header, sizeof(cmd_header)); | |
1609 | free(events); | |
1610 | ||
1611 | if (ret < 0) { | |
1612 | goto setup_error; | |
1613 | } | |
1614 | ||
1615 | ret = LTTNG_OK; | |
1616 | break; | |
1617 | } | |
1618 | case LTTNG_LIST_SESSIONS: | |
1619 | { | |
1620 | unsigned int nr_sessions; | |
1621 | void *sessions_payload; | |
1622 | size_t payload_len; | |
1623 | ||
1624 | session_lock_list(); | |
1625 | nr_sessions = lttng_sessions_count( | |
1626 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), | |
1627 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
b178f53e JG |
1628 | |
1629 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + | |
1630 | (sizeof(struct lttng_session_extended) * nr_sessions); | |
917a718d JG |
1631 | sessions_payload = zmalloc(payload_len); |
1632 | ||
1633 | if (!sessions_payload) { | |
1634 | session_unlock_list(); | |
1635 | ret = -ENOMEM; | |
1636 | goto setup_error; | |
1637 | } | |
1638 | ||
b178f53e | 1639 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
917a718d JG |
1640 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
1641 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); | |
1642 | session_unlock_list(); | |
1643 | ||
1644 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, | |
1645 | payload_len); | |
1646 | free(sessions_payload); | |
1647 | ||
1648 | if (ret < 0) { | |
1649 | goto setup_error; | |
1650 | } | |
1651 | ||
1652 | ret = LTTNG_OK; | |
1653 | break; | |
1654 | } | |
1655 | case LTTNG_REGISTER_CONSUMER: | |
1656 | { | |
1657 | struct consumer_data *cdata; | |
1658 | ||
1659 | switch (cmd_ctx->lsm->domain.type) { | |
1660 | case LTTNG_DOMAIN_KERNEL: | |
1661 | cdata = &kconsumer_data; | |
1662 | break; | |
1663 | default: | |
1664 | ret = LTTNG_ERR_UND; | |
1665 | goto error; | |
1666 | } | |
1667 | ||
1668 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, | |
1669 | cmd_ctx->lsm->u.reg.path, cdata); | |
1670 | break; | |
1671 | } | |
1672 | case LTTNG_DATA_PENDING: | |
1673 | { | |
1674 | int pending_ret; | |
1675 | uint8_t pending_ret_byte; | |
1676 | ||
1677 | pending_ret = cmd_data_pending(cmd_ctx->session); | |
1678 | ||
1679 | /* | |
1680 | * FIXME | |
1681 | * | |
1682 | * This function may returns 0 or 1 to indicate whether or not | |
1683 | * there is data pending. In case of error, it should return an | |
1684 | * LTTNG_ERR code. However, some code paths may still return | |
1685 | * a nondescript error code, which we handle by returning an | |
1686 | * "unknown" error. | |
1687 | */ | |
1688 | if (pending_ret == 0 || pending_ret == 1) { | |
1689 | /* | |
1690 | * ret will be set to LTTNG_OK at the end of | |
1691 | * this function. | |
1692 | */ | |
1693 | } else if (pending_ret < 0) { | |
1694 | ret = LTTNG_ERR_UNK; | |
1695 | goto setup_error; | |
1696 | } else { | |
1697 | ret = pending_ret; | |
1698 | goto setup_error; | |
1699 | } | |
1700 | ||
1701 | pending_ret_byte = (uint8_t) pending_ret; | |
1702 | ||
1703 | /* 1 byte to return whether or not data is pending */ | |
1704 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, | |
1705 | &pending_ret_byte, 1); | |
1706 | ||
1707 | if (ret < 0) { | |
1708 | goto setup_error; | |
1709 | } | |
1710 | ||
1711 | ret = LTTNG_OK; | |
1712 | break; | |
1713 | } | |
1714 | case LTTNG_SNAPSHOT_ADD_OUTPUT: | |
1715 | { | |
a914e76a | 1716 | uint32_t snapshot_id; |
917a718d JG |
1717 | struct lttcomm_lttng_output_id reply; |
1718 | ||
1719 | ret = cmd_snapshot_add_output(cmd_ctx->session, | |
df4f5a87 JG |
1720 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output), |
1721 | &snapshot_id); | |
917a718d JG |
1722 | if (ret != LTTNG_OK) { |
1723 | goto error; | |
1724 | } | |
a914e76a | 1725 | reply.id = snapshot_id; |
917a718d JG |
1726 | |
1727 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, | |
1728 | sizeof(reply)); | |
1729 | if (ret < 0) { | |
1730 | goto setup_error; | |
1731 | } | |
1732 | ||
1733 | /* Copy output list into message payload */ | |
1734 | ret = LTTNG_OK; | |
1735 | break; | |
1736 | } | |
1737 | case LTTNG_SNAPSHOT_DEL_OUTPUT: | |
1738 | { | |
1739 | ret = cmd_snapshot_del_output(cmd_ctx->session, | |
df4f5a87 | 1740 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output)); |
917a718d JG |
1741 | break; |
1742 | } | |
1743 | case LTTNG_SNAPSHOT_LIST_OUTPUT: | |
1744 | { | |
1745 | ssize_t nb_output; | |
1746 | struct lttng_snapshot_output *outputs = NULL; | |
1747 | ||
1748 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); | |
1749 | if (nb_output < 0) { | |
1750 | ret = -nb_output; | |
1751 | goto error; | |
1752 | } | |
1753 | ||
1754 | assert((nb_output > 0 && outputs) || nb_output == 0); | |
1755 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, | |
1756 | nb_output * sizeof(struct lttng_snapshot_output)); | |
1757 | free(outputs); | |
1758 | ||
1759 | if (ret < 0) { | |
1760 | goto setup_error; | |
1761 | } | |
1762 | ||
1763 | ret = LTTNG_OK; | |
1764 | break; | |
1765 | } | |
1766 | case LTTNG_SNAPSHOT_RECORD: | |
1767 | { | |
1768 | ret = cmd_snapshot_record(cmd_ctx->session, | |
df4f5a87 | 1769 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_record.output), |
917a718d JG |
1770 | cmd_ctx->lsm->u.snapshot_record.wait); |
1771 | break; | |
1772 | } | |
b178f53e | 1773 | case LTTNG_CREATE_SESSION_EXT: |
917a718d | 1774 | { |
b178f53e JG |
1775 | struct lttng_dynamic_buffer payload; |
1776 | struct lttng_session_descriptor *return_descriptor = NULL; | |
917a718d | 1777 | |
b178f53e | 1778 | lttng_dynamic_buffer_init(&payload); |
3e3665b8 | 1779 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
b178f53e JG |
1780 | if (ret != LTTNG_OK) { |
1781 | goto error; | |
917a718d JG |
1782 | } |
1783 | ||
b178f53e JG |
1784 | ret = lttng_session_descriptor_serialize(return_descriptor, |
1785 | &payload); | |
1786 | if (ret) { | |
1787 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); | |
1788 | lttng_session_descriptor_destroy(return_descriptor); | |
1789 | ret = LTTNG_ERR_NOMEM; | |
1790 | goto error; | |
917a718d | 1791 | } |
b178f53e JG |
1792 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
1793 | payload.size); | |
1794 | if (ret) { | |
1795 | lttng_session_descriptor_destroy(return_descriptor); | |
1796 | ret = LTTNG_ERR_NOMEM; | |
1797 | goto error; | |
1798 | } | |
1799 | lttng_dynamic_buffer_reset(&payload); | |
1800 | lttng_session_descriptor_destroy(return_descriptor); | |
1801 | ret = LTTNG_OK; | |
917a718d JG |
1802 | break; |
1803 | } | |
1804 | case LTTNG_SAVE_SESSION: | |
1805 | { | |
1806 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, | |
1807 | &cmd_ctx->creds); | |
1808 | break; | |
1809 | } | |
1810 | case LTTNG_SET_SESSION_SHM_PATH: | |
1811 | { | |
1812 | ret = cmd_set_session_shm_path(cmd_ctx->session, | |
1813 | cmd_ctx->lsm->u.set_shm_path.shm_path); | |
1814 | break; | |
1815 | } | |
1816 | case LTTNG_REGENERATE_METADATA: | |
1817 | { | |
1818 | ret = cmd_regenerate_metadata(cmd_ctx->session); | |
1819 | break; | |
1820 | } | |
1821 | case LTTNG_REGENERATE_STATEDUMP: | |
1822 | { | |
1823 | ret = cmd_regenerate_statedump(cmd_ctx->session); | |
1824 | break; | |
1825 | } | |
1826 | case LTTNG_REGISTER_TRIGGER: | |
1827 | { | |
3e3665b8 | 1828 | ret = cmd_register_trigger(cmd_ctx, *sock, |
917a718d JG |
1829 | notification_thread_handle); |
1830 | break; | |
1831 | } | |
1832 | case LTTNG_UNREGISTER_TRIGGER: | |
1833 | { | |
3e3665b8 | 1834 | ret = cmd_unregister_trigger(cmd_ctx, *sock, |
917a718d JG |
1835 | notification_thread_handle); |
1836 | break; | |
1837 | } | |
1838 | case LTTNG_ROTATE_SESSION: | |
1839 | { | |
1840 | struct lttng_rotate_session_return rotate_return; | |
1841 | ||
1842 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); | |
1843 | ||
1844 | memset(&rotate_return, 0, sizeof(rotate_return)); | |
1845 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
1846 | DBG("Kernel tracer version is not compatible with the rotation feature"); | |
1847 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1848 | goto error; | |
1849 | } | |
1850 | ||
7fdbed1c JG |
1851 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
1852 | false); | |
917a718d JG |
1853 | if (ret < 0) { |
1854 | ret = -ret; | |
1855 | goto error; | |
1856 | } | |
1857 | ||
1858 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, | |
1859 | sizeof(rotate_return)); | |
1860 | if (ret < 0) { | |
1861 | ret = -ret; | |
1862 | goto error; | |
1863 | } | |
1864 | ||
1865 | ret = LTTNG_OK; | |
1866 | break; | |
1867 | } | |
1868 | case LTTNG_ROTATION_GET_INFO: | |
1869 | { | |
1870 | struct lttng_rotation_get_info_return get_info_return; | |
1871 | ||
1872 | memset(&get_info_return, 0, sizeof(get_info_return)); | |
1873 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, | |
1874 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); | |
1875 | if (ret < 0) { | |
1876 | ret = -ret; | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, | |
1881 | sizeof(get_info_return)); | |
1882 | if (ret < 0) { | |
1883 | ret = -ret; | |
1884 | goto error; | |
1885 | } | |
1886 | ||
1887 | ret = LTTNG_OK; | |
1888 | break; | |
1889 | } | |
1890 | case LTTNG_ROTATION_SET_SCHEDULE: | |
1891 | { | |
1892 | bool set_schedule; | |
1893 | enum lttng_rotation_schedule_type schedule_type; | |
1894 | uint64_t value; | |
1895 | ||
1896 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { | |
1897 | DBG("Kernel tracer version does not support session rotations"); | |
1898 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; | |
1899 | goto error; | |
1900 | } | |
1901 | ||
1902 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; | |
1903 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; | |
1904 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; | |
1905 | ||
1906 | ret = cmd_rotation_set_schedule(cmd_ctx->session, | |
1907 | set_schedule, | |
1908 | schedule_type, | |
1909 | value, | |
1910 | notification_thread_handle); | |
1911 | if (ret != LTTNG_OK) { | |
1912 | goto error; | |
1913 | } | |
1914 | ||
1915 | break; | |
1916 | } | |
1917 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: | |
1918 | { | |
1919 | struct lttng_session_list_schedules_return schedules = { | |
1920 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, | |
1921 | .periodic.value = cmd_ctx->session->rotate_timer_period, | |
1922 | .size.set = !!cmd_ctx->session->rotate_size, | |
1923 | .size.value = cmd_ctx->session->rotate_size, | |
1924 | }; | |
1925 | ||
1926 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, | |
1927 | sizeof(schedules)); | |
1928 | if (ret < 0) { | |
1929 | ret = -ret; | |
1930 | goto error; | |
1931 | } | |
1932 | ||
1933 | ret = LTTNG_OK; | |
1934 | break; | |
1935 | } | |
1936 | default: | |
1937 | ret = LTTNG_ERR_UND; | |
1938 | break; | |
1939 | } | |
1940 | ||
1941 | error: | |
1942 | if (cmd_ctx->llm == NULL) { | |
1943 | DBG("Missing llm structure. Allocating one."); | |
1944 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { | |
1945 | goto setup_error; | |
1946 | } | |
1947 | } | |
1948 | /* Set return code */ | |
1949 | cmd_ctx->llm->ret_code = ret; | |
1950 | setup_error: | |
1951 | if (cmd_ctx->session) { | |
1952 | session_unlock(cmd_ctx->session); | |
1953 | session_put(cmd_ctx->session); | |
3e3665b8 | 1954 | cmd_ctx->session = NULL; |
917a718d JG |
1955 | } |
1956 | if (need_tracing_session) { | |
1957 | session_unlock_list(); | |
1958 | } | |
1959 | init_setup_error: | |
1960 | assert(!rcu_read_ongoing()); | |
1961 | return ret; | |
1962 | } | |
1963 | ||
1964 | static int create_client_sock(void) | |
1965 | { | |
1966 | int ret, client_sock; | |
1967 | const mode_t old_umask = umask(0); | |
1968 | ||
1969 | /* Create client tool unix socket */ | |
1970 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); | |
1971 | if (client_sock < 0) { | |
1972 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); | |
1973 | ret = -1; | |
1974 | goto end; | |
1975 | } | |
1976 | ||
1977 | /* Set the cloexec flag */ | |
1978 | ret = utils_set_fd_cloexec(client_sock); | |
1979 | if (ret < 0) { | |
1980 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " | |
1981 | "Continuing but note that the consumer daemon will have a " | |
1982 | "reference to this socket on exec()", client_sock); | |
1983 | } | |
1984 | ||
1985 | /* File permission MUST be 660 */ | |
1986 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
1987 | if (ret < 0) { | |
1988 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); | |
1989 | PERROR("chmod"); | |
1990 | goto end; | |
1991 | } | |
1992 | DBG("Created client socket (fd = %i)", client_sock); | |
1993 | ret = client_sock; | |
1994 | end: | |
1995 | umask(old_umask); | |
1996 | return ret; | |
1997 | } | |
1998 | ||
1999 | static void cleanup_client_thread(void *data) | |
2000 | { | |
2001 | struct lttng_pipe *quit_pipe = data; | |
2002 | ||
2003 | lttng_pipe_destroy(quit_pipe); | |
2004 | } | |
2005 | ||
6cb45e93 JG |
2006 | static void thread_init_cleanup(void *data) |
2007 | { | |
2008 | set_thread_status(false); | |
2009 | } | |
2010 | ||
917a718d JG |
2011 | /* |
2012 | * This thread manage all clients request using the unix client socket for | |
2013 | * communication. | |
2014 | */ | |
2015 | static void *thread_manage_clients(void *data) | |
2016 | { | |
2017 | int sock = -1, ret, i, pollfd, err = -1; | |
2018 | int sock_error; | |
2019 | uint32_t revents, nb_fd; | |
2020 | struct command_ctx *cmd_ctx = NULL; | |
2021 | struct lttng_poll_event events; | |
2022 | int client_sock = -1; | |
2023 | struct lttng_pipe *quit_pipe = data; | |
2024 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); | |
2025 | ||
2026 | DBG("[thread] Manage client started"); | |
2027 | ||
2028 | is_root = (getuid() == 0); | |
2029 | ||
6cb45e93 | 2030 | pthread_cleanup_push(thread_init_cleanup, NULL); |
917a718d JG |
2031 | client_sock = create_client_sock(); |
2032 | if (client_sock < 0) { | |
2033 | goto error_listen; | |
2034 | } | |
2035 | ||
2036 | rcu_register_thread(); | |
2037 | ||
2038 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); | |
2039 | ||
2040 | health_code_update(); | |
2041 | ||
2042 | ret = lttcomm_listen_unix_sock(client_sock); | |
2043 | if (ret < 0) { | |
2044 | goto error_listen; | |
2045 | } | |
2046 | ||
2047 | /* | |
2048 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing | |
2049 | * more will be added to this poll set. | |
2050 | */ | |
2051 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
2052 | if (ret < 0) { | |
2053 | goto error_create_poll; | |
2054 | } | |
2055 | ||
2056 | /* Add the application registration socket */ | |
2057 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); | |
2058 | if (ret < 0) { | |
2059 | goto error; | |
2060 | } | |
2061 | ||
2062 | /* Add thread quit pipe */ | |
2063 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); | |
2064 | if (ret < 0) { | |
2065 | goto error; | |
2066 | } | |
2067 | ||
6cb45e93 JG |
2068 | /* Set state as running. */ |
2069 | set_thread_status(true); | |
2070 | pthread_cleanup_pop(0); | |
2071 | ||
917a718d JG |
2072 | /* This testpoint is after we signal readiness to the parent. */ |
2073 | if (testpoint(sessiond_thread_manage_clients)) { | |
2074 | goto error; | |
2075 | } | |
2076 | ||
2077 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { | |
2078 | goto error; | |
2079 | } | |
2080 | ||
2081 | health_code_update(); | |
2082 | ||
917a718d JG |
2083 | while (1) { |
2084 | const struct cmd_completion_handler *cmd_completion_handler; | |
2085 | ||
2086 | DBG("Accepting client command ..."); | |
2087 | ||
2088 | /* Inifinite blocking call, waiting for transmission */ | |
2089 | restart: | |
2090 | health_poll_entry(); | |
2091 | ret = lttng_poll_wait(&events, -1); | |
2092 | health_poll_exit(); | |
2093 | if (ret < 0) { | |
2094 | /* | |
2095 | * Restart interrupted system call. | |
2096 | */ | |
2097 | if (errno == EINTR) { | |
2098 | goto restart; | |
2099 | } | |
2100 | goto error; | |
2101 | } | |
2102 | ||
2103 | nb_fd = ret; | |
2104 | ||
2105 | for (i = 0; i < nb_fd; i++) { | |
2106 | revents = LTTNG_POLL_GETEV(&events, i); | |
2107 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
2108 | ||
2109 | health_code_update(); | |
2110 | ||
917a718d JG |
2111 | if (pollfd == thread_quit_pipe_fd) { |
2112 | err = 0; | |
2113 | goto exit; | |
2114 | } else { | |
2115 | /* Event on the registration socket */ | |
2116 | if (revents & LPOLLIN) { | |
2117 | continue; | |
2118 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
2119 | ERR("Client socket poll error"); | |
2120 | goto error; | |
2121 | } else { | |
2122 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2123 | goto error; | |
2124 | } | |
2125 | } | |
2126 | } | |
2127 | ||
2128 | DBG("Wait for client response"); | |
2129 | ||
2130 | health_code_update(); | |
2131 | ||
2132 | sock = lttcomm_accept_unix_sock(client_sock); | |
2133 | if (sock < 0) { | |
2134 | goto error; | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
2139 | * show must go on. | |
2140 | */ | |
2141 | (void) utils_set_fd_cloexec(sock); | |
2142 | ||
2143 | /* Set socket option for credentials retrieval */ | |
2144 | ret = lttcomm_setsockopt_creds_unix_sock(sock); | |
2145 | if (ret < 0) { | |
2146 | goto error; | |
2147 | } | |
2148 | ||
2149 | /* Allocate context command to process the client request */ | |
2150 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); | |
2151 | if (cmd_ctx == NULL) { | |
2152 | PERROR("zmalloc cmd_ctx"); | |
2153 | goto error; | |
2154 | } | |
2155 | ||
2156 | /* Allocate data buffer for reception */ | |
2157 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); | |
2158 | if (cmd_ctx->lsm == NULL) { | |
2159 | PERROR("zmalloc cmd_ctx->lsm"); | |
2160 | goto error; | |
2161 | } | |
2162 | ||
2163 | cmd_ctx->llm = NULL; | |
2164 | cmd_ctx->session = NULL; | |
2165 | ||
2166 | health_code_update(); | |
2167 | ||
2168 | /* | |
2169 | * Data is received from the lttng client. The struct | |
2170 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2171 | * the client. | |
2172 | */ | |
2173 | DBG("Receiving data from client ..."); | |
2174 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, | |
2175 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); | |
2176 | if (ret <= 0) { | |
2177 | DBG("Nothing recv() from client... continuing"); | |
2178 | ret = close(sock); | |
2179 | if (ret) { | |
2180 | PERROR("close"); | |
2181 | } | |
2182 | sock = -1; | |
2183 | clean_command_ctx(&cmd_ctx); | |
2184 | continue; | |
2185 | } | |
2186 | ||
2187 | health_code_update(); | |
2188 | ||
2189 | // TODO: Validate cmd_ctx including sanity check for | |
2190 | // security purpose. | |
2191 | ||
2192 | rcu_thread_online(); | |
2193 | /* | |
2194 | * This function dispatch the work to the kernel or userspace tracer | |
2195 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2196 | * informations for the client. The command context struct contains | |
2197 | * everything this function may needs. | |
2198 | */ | |
3e3665b8 | 2199 | ret = process_client_msg(cmd_ctx, &sock, &sock_error); |
917a718d JG |
2200 | rcu_thread_offline(); |
2201 | if (ret < 0) { | |
3e3665b8 JG |
2202 | if (sock >= 0) { |
2203 | ret = close(sock); | |
2204 | if (ret) { | |
2205 | PERROR("close"); | |
2206 | } | |
2207 | } | |
2208 | sock = -1; | |
917a718d JG |
2209 | /* |
2210 | * TODO: Inform client somehow of the fatal error. At | |
2211 | * this point, ret < 0 means that a zmalloc failed | |
2212 | * (ENOMEM). Error detected but still accept | |
2213 | * command, unless a socket error has been | |
2214 | * detected. | |
2215 | */ | |
2216 | clean_command_ctx(&cmd_ctx); | |
2217 | continue; | |
2218 | } | |
2219 | ||
2220 | cmd_completion_handler = cmd_pop_completion_handler(); | |
2221 | if (cmd_completion_handler) { | |
2222 | enum lttng_error_code completion_code; | |
2223 | ||
2224 | completion_code = cmd_completion_handler->run( | |
2225 | cmd_completion_handler->data); | |
2226 | if (completion_code != LTTNG_OK) { | |
2227 | clean_command_ctx(&cmd_ctx); | |
2228 | continue; | |
2229 | } | |
2230 | } | |
2231 | ||
2232 | health_code_update(); | |
2233 | ||
3e3665b8 JG |
2234 | if (sock >= 0) { |
2235 | DBG("Sending response (size: %d, retcode: %s (%d))", | |
2236 | cmd_ctx->lttng_msg_size, | |
2237 | lttng_strerror(-cmd_ctx->llm->ret_code), | |
2238 | cmd_ctx->llm->ret_code); | |
2239 | ret = send_unix_sock(sock, cmd_ctx->llm, | |
2240 | cmd_ctx->lttng_msg_size); | |
2241 | if (ret < 0) { | |
2242 | ERR("Failed to send data back to client"); | |
2243 | } | |
917a718d | 2244 | |
3e3665b8 JG |
2245 | /* End of transmission */ |
2246 | ret = close(sock); | |
2247 | if (ret) { | |
2248 | PERROR("close"); | |
2249 | } | |
2250 | } | |
2251 | sock = -1; | |
917a718d JG |
2252 | |
2253 | clean_command_ctx(&cmd_ctx); | |
2254 | ||
2255 | health_code_update(); | |
2256 | } | |
2257 | ||
2258 | exit: | |
2259 | error: | |
2260 | if (sock >= 0) { | |
2261 | ret = close(sock); | |
2262 | if (ret) { | |
2263 | PERROR("close"); | |
2264 | } | |
2265 | } | |
2266 | ||
2267 | lttng_poll_clean(&events); | |
2268 | clean_command_ctx(&cmd_ctx); | |
2269 | ||
2270 | error_listen: | |
2271 | error_create_poll: | |
2272 | unlink(config.client_unix_sock_path.value); | |
2273 | if (client_sock >= 0) { | |
2274 | ret = close(client_sock); | |
2275 | if (ret) { | |
2276 | PERROR("close"); | |
2277 | } | |
2278 | } | |
2279 | ||
2280 | if (err) { | |
2281 | health_error(); | |
2282 | ERR("Health error occurred in %s", __func__); | |
2283 | } | |
2284 | ||
2285 | health_unregister(health_sessiond); | |
2286 | ||
2287 | DBG("Client thread dying"); | |
2288 | ||
2289 | rcu_unregister_thread(); | |
917a718d JG |
2290 | return NULL; |
2291 | } | |
2292 | ||
2293 | static | |
2294 | bool shutdown_client_thread(void *thread_data) | |
2295 | { | |
2296 | struct lttng_pipe *client_quit_pipe = thread_data; | |
2297 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); | |
2298 | ||
2299 | return notify_thread_pipe(write_fd) == 1; | |
2300 | } | |
2301 | ||
2302 | struct lttng_thread *launch_client_thread(void) | |
2303 | { | |
6cb45e93 | 2304 | bool thread_running; |
917a718d JG |
2305 | struct lttng_pipe *client_quit_pipe; |
2306 | struct lttng_thread *thread; | |
2307 | ||
6cb45e93 | 2308 | sem_init(&thread_state.ready, 0, 0); |
917a718d JG |
2309 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
2310 | if (!client_quit_pipe) { | |
2311 | goto error; | |
2312 | } | |
2313 | ||
2314 | thread = lttng_thread_create("Client management", | |
2315 | thread_manage_clients, | |
2316 | shutdown_client_thread, | |
2317 | cleanup_client_thread, | |
2318 | client_quit_pipe); | |
2319 | if (!thread) { | |
2320 | goto error; | |
2321 | } | |
2322 | ||
2323 | /* | |
2324 | * This thread is part of the threads that need to be fully | |
2325 | * initialized before the session daemon is marked as "ready". | |
2326 | */ | |
6cb45e93 JG |
2327 | thread_running = wait_thread_status(); |
2328 | if (!thread_running) { | |
2329 | lttng_thread_put(thread); | |
2330 | thread = NULL; | |
2331 | } | |
917a718d JG |
2332 | return thread; |
2333 | error: | |
2334 | cleanup_client_thread(client_quit_pipe); | |
2335 | return NULL; | |
2336 | } |