projects / lttng-tools.git / blob
? search:


82ace4902596f71fcc1f9a9e03cf5d4dc500ce85
[lttng-tools.git] / src / bin / lttng-sessiond / client.c
1 /*
2 * Copyright (C) 2011 EfficiOS Inc.
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 *
6 * SPDX-License-Identifier: GPL-2.0-only
7 *
8 */
9
10 #include "common/buffer-view.h"
11 #include "common/compat/socket.h"
12 #include "common/dynamic-array.h"
13 #include "common/dynamic-buffer.h"
14 #include "common/fd-handle.h"
15 #include "common/payload-view.h"
16 #include "common/payload.h"
17 #include "common/sessiond-comm/sessiond-comm.h"
18 #include "lttng/lttng-error.h"
19 #include "lttng/tracker.h"
20 #include <common/compat/getenv.h>
21 #include <common/tracker.h>
22 #include <common/unix.h>
23 #include <common/utils.h>
24 #include <lttng/error-query-internal.h>
25 #include <lttng/event-internal.h>
26 #include <lttng/session-descriptor-internal.h>
27 #include <lttng/session-internal.h>
28 #include <lttng/userspace-probe-internal.h>
29 #include <pthread.h>
30 #include <signal.h>
31 #include <stddef.h>
32 #include <stdint.h>
33 #include <sys/stat.h>
34 #include <unistd.h>
35
36 #include "agent-thread.h"
37 #include "clear.h"
38 #include "client.h"
39 #include "cmd.h"
40 #include "health-sessiond.h"
41 #include "kernel.h"
42 #include "lttng-sessiond.h"
43 #include "manage-consumer.h"
44 #include "save.h"
45 #include "testpoint.h"
46 #include "utils.h"
47
48 static bool is_root;
49
50 static struct thread_state {
51 sem_t ready;
52 bool running;
53 int client_sock;
54 } thread_state;
55
56 static void set_thread_status(bool running)
57 {
58 DBG("Marking client thread's state as %s", running ? "running" : "error");
59 thread_state.running = running;
60 sem_post(&thread_state.ready);
61 }
62
63 static bool wait_thread_status(void)
64 {
65 DBG("Waiting for client thread to be ready");
66 sem_wait(&thread_state.ready);
67 if (thread_state.running) {
68 DBG("Client thread is ready");
69 } else {
70 ERR("Initialization of client thread failed");
71 }
72
73 return thread_state.running;
74 }
75
76 /*
77 * Setup the outgoing data buffer for the response (llm) by allocating the
78 * right amount of memory and copying the original information from the lsm
79 * structure.
80 *
81 * Return 0 on success, negative value on error.
82 */
83 static int setup_lttng_msg(struct command_ctx *cmd_ctx,
84 const void *payload_buf, size_t payload_len,
85 const void *cmd_header_buf, size_t cmd_header_len)
86 {
87 int ret = 0;
88 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
89 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
90 const struct lttcomm_lttng_msg llm = {
91 .cmd_type = cmd_ctx->lsm.cmd_type,
92 .pid = cmd_ctx->lsm.domain.attr.pid,
93 .cmd_header_size = cmd_header_len,
94 .data_size = payload_len,
95 };
96
97 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
98 if (ret) {
99 goto end;
100 }
101
102 lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles);
103
104 cmd_ctx->lttng_msg_size = total_msg_size;
105
106 /* Append reply header. */
107 ret = lttng_dynamic_buffer_append(
108 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
109 if (ret) {
110 goto end;
111 }
112
113 /* Append command header. */
114 if (cmd_header_len) {
115 ret = lttng_dynamic_buffer_append(
116 &cmd_ctx->reply_payload.buffer, cmd_header_buf,
117 cmd_header_len);
118 if (ret) {
119 goto end;
120 }
121 }
122
123 /* Append payload. */
124 if (payload_len) {
125 ret = lttng_dynamic_buffer_append(
126 &cmd_ctx->reply_payload.buffer, payload_buf,
127 payload_len);
128 if (ret) {
129 goto end;
130 }
131 }
132
133 end:
134 return ret;
135 }
136
137 static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx)
138 {
139 int ret;
140 const struct lttcomm_lttng_msg llm = {};
141
142 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
143 if (ret) {
144 goto end;
145 }
146
147 /* Append place-holder reply header. */
148 ret = lttng_dynamic_buffer_append(
149 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
150 if (ret) {
151 goto end;
152 }
153
154 cmd_ctx->lttng_msg_size = sizeof(llm);
155 end:
156 return ret;
157 }
158
159 static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len,
160 size_t payload_len)
161 {
162 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
163 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
164 const struct lttcomm_lttng_msg llm = {
165 .cmd_type = cmd_ctx->lsm.cmd_type,
166 .pid = cmd_ctx->lsm.domain.attr.pid,
167 .cmd_header_size = cmd_header_len,
168 .data_size = payload_len,
169 };
170 struct lttcomm_lttng_msg *p_llm;
171
172 assert(cmd_ctx->reply_payload.buffer.size >= sizeof(llm));
173
174 p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data;
175
176 /* Update existing header. */
177 memcpy(p_llm, &llm, sizeof(llm));
178
179 cmd_ctx->lttng_msg_size = total_msg_size;
180 }
181
182 /*
183 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
184 * exec or it will fail.
185 */
186 static int spawn_consumer_thread(struct consumer_data *consumer_data)
187 {
188 return launch_consumer_management_thread(consumer_data) ? 0 : -1;
189 }
190
191 /*
192 * Fork and exec a consumer daemon (consumerd).
193 *
194 * Return pid if successful else -1.
195 */
196 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
197 {
198 int ret;
199 pid_t pid;
200 const char *consumer_to_use;
201 const char *verbosity;
202 struct stat st;
203
204 DBG("Spawning consumerd");
205
206 pid = fork();
207 if (pid == 0) {
208 /*
209 * Exec consumerd.
210 */
211 if (the_config.verbose_consumer) {
212 verbosity = "--verbose";
213 } else if (lttng_opt_quiet) {
214 verbosity = "--quiet";
215 } else {
216 verbosity = "";
217 }
218
219 switch (consumer_data->type) {
220 case LTTNG_CONSUMER_KERNEL:
221 /*
222 * Find out which consumerd to execute. We will first try the
223 * 64-bit path, then the sessiond's installation directory, and
224 * fallback on the 32-bit one,
225 */
226 DBG3("Looking for a kernel consumer at these locations:");
227 DBG3(" 1) %s", the_config.consumerd64_bin_path.value ? : "NULL");
228 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE);
229 DBG3(" 3) %s", the_config.consumerd32_bin_path.value ? : "NULL");
230 if (stat(the_config.consumerd64_bin_path.value, &st) == 0) {
231 DBG3("Found location #1");
232 consumer_to_use = the_config.consumerd64_bin_path.value;
233 } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) {
234 DBG3("Found location #2");
235 consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE;
236 } else if (the_config.consumerd32_bin_path.value &&
237 stat(the_config.consumerd32_bin_path.value, &st) == 0) {
238 DBG3("Found location #3");
239 consumer_to_use = the_config.consumerd32_bin_path.value;
240 } else {
241 DBG("Could not find any valid consumerd executable");
242 ret = -EINVAL;
243 goto error;
244 }
245 DBG("Using kernel consumer at: %s", consumer_to_use);
246 (void) execl(consumer_to_use, "lttng-consumerd",
247 verbosity, "-k", "--consumerd-cmd-sock",
248 consumer_data->cmd_unix_sock_path,
249 "--consumerd-err-sock",
250 consumer_data->err_unix_sock_path,
251 "--group",
252 the_config.tracing_group_name.value,
253 NULL);
254 break;
255 case LTTNG_CONSUMER64_UST:
256 {
257 if (the_config.consumerd64_lib_dir.value) {
258 const char *tmp;
259 size_t tmplen;
260 char *tmpnew;
261
262 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
263 if (!tmp) {
264 tmp = "";
265 }
266 tmplen = strlen(the_config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp);
267 tmpnew = zmalloc(tmplen + 1 /* \0 */);
268 if (!tmpnew) {
269 ret = -ENOMEM;
270 goto error;
271 }
272 strcat(tmpnew, the_config.consumerd64_lib_dir.value);
273 if (tmp[0] != '\0') {
274 strcat(tmpnew, ":");
275 strcat(tmpnew, tmp);
276 }
277 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
278 free(tmpnew);
279 if (ret) {
280 ret = -errno;
281 goto error;
282 }
283 }
284 DBG("Using 64-bit UST consumer at: %s",
285 the_config.consumerd64_bin_path.value);
286 (void) execl(the_config.consumerd64_bin_path.value,
287 "lttng-consumerd", verbosity, "-u",
288 "--consumerd-cmd-sock",
289 consumer_data->cmd_unix_sock_path,
290 "--consumerd-err-sock",
291 consumer_data->err_unix_sock_path,
292 "--group",
293 the_config.tracing_group_name.value,
294 NULL);
295 break;
296 }
297 case LTTNG_CONSUMER32_UST:
298 {
299 if (the_config.consumerd32_lib_dir.value) {
300 const char *tmp;
301 size_t tmplen;
302 char *tmpnew;
303
304 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
305 if (!tmp) {
306 tmp = "";
307 }
308 tmplen = strlen(the_config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp);
309 tmpnew = zmalloc(tmplen + 1 /* \0 */);
310 if (!tmpnew) {
311 ret = -ENOMEM;
312 goto error;
313 }
314 strcat(tmpnew, the_config.consumerd32_lib_dir.value);
315 if (tmp[0] != '\0') {
316 strcat(tmpnew, ":");
317 strcat(tmpnew, tmp);
318 }
319 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
320 free(tmpnew);
321 if (ret) {
322 ret = -errno;
323 goto error;
324 }
325 }
326 DBG("Using 32-bit UST consumer at: %s",
327 the_config.consumerd32_bin_path.value);
328 (void) execl(the_config.consumerd32_bin_path.value,
329 "lttng-consumerd", verbosity, "-u",
330 "--consumerd-cmd-sock",
331 consumer_data->cmd_unix_sock_path,
332 "--consumerd-err-sock",
333 consumer_data->err_unix_sock_path,
334 "--group",
335 the_config.tracing_group_name.value,
336 NULL);
337 break;
338 }
339 default:
340 ERR("unknown consumer type");
341 errno = 0;
342 }
343 if (errno != 0) {
344 PERROR("Consumer execl()");
345 }
346 /* Reaching this point, we got a failure on our execl(). */
347 exit(EXIT_FAILURE);
348 } else if (pid > 0) {
349 ret = pid;
350 } else {
351 PERROR("start consumer fork");
352 ret = -errno;
353 }
354 error:
355 return ret;
356 }
357
358 /*
359 * Spawn the consumerd daemon and session daemon thread.
360 */
361 static int start_consumerd(struct consumer_data *consumer_data)
362 {
363 int ret;
364
365 /*
366 * Set the listen() state on the socket since there is a possible race
367 * between the exec() of the consumer daemon and this call if place in the
368 * consumer thread. See bug #366 for more details.
369 */
370 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
371 if (ret < 0) {
372 goto error;
373 }
374
375 pthread_mutex_lock(&consumer_data->pid_mutex);
376 if (consumer_data->pid != 0) {
377 pthread_mutex_unlock(&consumer_data->pid_mutex);
378 goto end;
379 }
380
381 ret = spawn_consumerd(consumer_data);
382 if (ret < 0) {
383 ERR("Spawning consumerd failed");
384 pthread_mutex_unlock(&consumer_data->pid_mutex);
385 goto error;
386 }
387
388 /* Setting up the consumer_data pid */
389 consumer_data->pid = ret;
390 DBG2("Consumer pid %d", consumer_data->pid);
391 pthread_mutex_unlock(&consumer_data->pid_mutex);
392
393 DBG2("Spawning consumer control thread");
394 ret = spawn_consumer_thread(consumer_data);
395 if (ret < 0) {
396 ERR("Fatal error spawning consumer control thread");
397 goto error;
398 }
399
400 end:
401 return 0;
402
403 error:
404 /* Cleanup already created sockets on error. */
405 if (consumer_data->err_sock >= 0) {
406 int err;
407
408 err = close(consumer_data->err_sock);
409 if (err < 0) {
410 PERROR("close consumer data error socket");
411 }
412 }
413 return ret;
414 }
415
416 /*
417 * Copy consumer output from the tracing session to the domain session. The
418 * function also applies the right modification on a per domain basis for the
419 * trace files destination directory.
420 *
421 * Should *NOT* be called with RCU read-side lock held.
422 */
423 static int copy_session_consumer(int domain, struct ltt_session *session)
424 {
425 int ret;
426 const char *dir_name;
427 struct consumer_output *consumer;
428
429 assert(session);
430 assert(session->consumer);
431
432 switch (domain) {
433 case LTTNG_DOMAIN_KERNEL:
434 DBG3("Copying tracing session consumer output in kernel session");
435 /*
436 * XXX: We should audit the session creation and what this function
437 * does "extra" in order to avoid a destroy since this function is used
438 * in the domain session creation (kernel and ust) only. Same for UST
439 * domain.
440 */
441 if (session->kernel_session->consumer) {
442 consumer_output_put(session->kernel_session->consumer);
443 }
444 session->kernel_session->consumer =
445 consumer_copy_output(session->consumer);
446 /* Ease our life a bit for the next part */
447 consumer = session->kernel_session->consumer;
448 dir_name = DEFAULT_KERNEL_TRACE_DIR;
449 break;
450 case LTTNG_DOMAIN_JUL:
451 case LTTNG_DOMAIN_LOG4J:
452 case LTTNG_DOMAIN_PYTHON:
453 case LTTNG_DOMAIN_UST:
454 DBG3("Copying tracing session consumer output in UST session");
455 if (session->ust_session->consumer) {
456 consumer_output_put(session->ust_session->consumer);
457 }
458 session->ust_session->consumer =
459 consumer_copy_output(session->consumer);
460 /* Ease our life a bit for the next part */
461 consumer = session->ust_session->consumer;
462 dir_name = DEFAULT_UST_TRACE_DIR;
463 break;
464 default:
465 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
466 goto error;
467 }
468
469 /* Append correct directory to subdir */
470 ret = lttng_strncpy(consumer->domain_subdir, dir_name,
471 sizeof(consumer->domain_subdir));
472 if (ret) {
473 ret = LTTNG_ERR_UNK;
474 goto error;
475 }
476 DBG3("Copy session consumer subdir %s", consumer->domain_subdir);
477 ret = LTTNG_OK;
478
479 error:
480 return ret;
481 }
482
483 /*
484 * Create an UST session and add it to the session ust list.
485 *
486 * Should *NOT* be called with RCU read-side lock held.
487 */
488 static int create_ust_session(struct ltt_session *session,
489 const struct lttng_domain *domain)
490 {
491 int ret;
492 struct ltt_ust_session *lus = NULL;
493
494 assert(session);
495 assert(domain);
496 assert(session->consumer);
497
498 switch (domain->type) {
499 case LTTNG_DOMAIN_JUL:
500 case LTTNG_DOMAIN_LOG4J:
501 case LTTNG_DOMAIN_PYTHON:
502 case LTTNG_DOMAIN_UST:
503 break;
504 default:
505 ERR("Unknown UST domain on create session %d", domain->type);
506 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
507 goto error;
508 }
509
510 DBG("Creating UST session");
511
512 lus = trace_ust_create_session(session->id);
513 if (lus == NULL) {
514 ret = LTTNG_ERR_UST_SESS_FAIL;
515 goto error;
516 }
517
518 lus->uid = session->uid;
519 lus->gid = session->gid;
520 lus->output_traces = session->output_traces;
521 lus->snapshot_mode = session->snapshot_mode;
522 lus->live_timer_interval = session->live_timer;
523 session->ust_session = lus;
524 if (session->shm_path[0]) {
525 strncpy(lus->root_shm_path, session->shm_path,
526 sizeof(lus->root_shm_path));
527 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
528 strncpy(lus->shm_path, session->shm_path,
529 sizeof(lus->shm_path));
530 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
531 strncat(lus->shm_path, "/ust",
532 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
533 }
534 /* Copy session output to the newly created UST session */
535 ret = copy_session_consumer(domain->type, session);
536 if (ret != LTTNG_OK) {
537 goto error;
538 }
539
540 return LTTNG_OK;
541
542 error:
543 free(lus);
544 session->ust_session = NULL;
545 return ret;
546 }
547
548 /*
549 * Create a kernel tracer session then create the default channel.
550 */
551 static int create_kernel_session(struct ltt_session *session)
552 {
553 int ret;
554
555 DBG("Creating kernel session");
556
557 ret = kernel_create_session(session);
558 if (ret < 0) {
559 ret = LTTNG_ERR_KERN_SESS_FAIL;
560 goto error_create;
561 }
562
563 /* Code flow safety */
564 assert(session->kernel_session);
565
566 /* Copy session output to the newly created Kernel session */
567 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
568 if (ret != LTTNG_OK) {
569 goto error;
570 }
571
572 session->kernel_session->uid = session->uid;
573 session->kernel_session->gid = session->gid;
574 session->kernel_session->output_traces = session->output_traces;
575 session->kernel_session->snapshot_mode = session->snapshot_mode;
576 session->kernel_session->is_live_session = session->live_timer != 0;
577
578 return LTTNG_OK;
579
580 error:
581 trace_kernel_destroy_session(session->kernel_session);
582 session->kernel_session = NULL;
583 error_create:
584 return ret;
585 }
586
587 /*
588 * Count number of session permitted by uid/gid.
589 */
590 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
591 {
592 unsigned int i = 0;
593 struct ltt_session *session;
594 const struct ltt_session_list *session_list = session_get_list();
595
596 DBG("Counting number of available session for UID %d", uid);
597 cds_list_for_each_entry(session, &session_list->head, list) {
598 if (!session_get(session)) {
599 continue;
600 }
601 session_lock(session);
602 /* Only count the sessions the user can control. */
603 if (session_access_ok(session, uid) &&
604 !session->destroyed) {
605 i++;
606 }
607 session_unlock(session);
608 session_put(session);
609 }
610 return i;
611 }
612
613 static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx,
614 int sock,
615 int *sock_error,
616 struct lttng_trigger **_trigger)
617 {
618 int ret;
619 size_t trigger_len;
620 ssize_t sock_recv_len;
621 enum lttng_error_code ret_code;
622 struct lttng_payload trigger_payload;
623 struct lttng_trigger *trigger = NULL;
624
625 lttng_payload_init(&trigger_payload);
626 trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
627 ret = lttng_dynamic_buffer_set_size(
628 &trigger_payload.buffer, trigger_len);
629 if (ret) {
630 ret_code = LTTNG_ERR_NOMEM;
631 goto end;
632 }
633
634 sock_recv_len = lttcomm_recv_unix_sock(
635 sock, trigger_payload.buffer.data, trigger_len);
636 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
637 ERR("Failed to receive trigger in command payload");
638 *sock_error = 1;
639 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
640 goto end;
641 }
642
643 /* Receive fds, if any. */
644 if (cmd_ctx->lsm.fd_count > 0) {
645 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
646 sock, cmd_ctx->lsm.fd_count, &trigger_payload);
647 if (sock_recv_len > 0 &&
648 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
649 ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
650 cmd_ctx->lsm.fd_count, (int) ret);
651 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
652 *sock_error = 1;
653 goto end;
654 } else if (sock_recv_len <= 0) {
655 ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
656 cmd_ctx->lsm.fd_count, (int) ret);
657 ret_code = LTTNG_ERR_FATAL;
658 *sock_error = 1;
659 goto end;
660 }
661 }
662
663 /* Deserialize trigger. */
664 {
665 struct lttng_payload_view view =
666 lttng_payload_view_from_payload(
667 &trigger_payload, 0, -1);
668
669 if (lttng_trigger_create_from_payload(&view, &trigger) !=
670 trigger_len) {
671 ERR("Invalid trigger received as part of command payload");
672 ret_code = LTTNG_ERR_INVALID_TRIGGER;
673 lttng_trigger_put(trigger);
674 goto end;
675 }
676 }
677
678 *_trigger = trigger;
679 ret_code = LTTNG_OK;
680
681 end:
682 lttng_payload_reset(&trigger_payload);
683 return ret_code;
684 }
685
686 static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx,
687 int sock,
688 int *sock_error,
689 struct lttng_error_query **_query)
690 {
691 int ret;
692 size_t query_len;
693 ssize_t sock_recv_len;
694 enum lttng_error_code ret_code;
695 struct lttng_payload query_payload;
696 struct lttng_error_query *query = NULL;
697
698 lttng_payload_init(&query_payload);
699 query_len = (size_t) cmd_ctx->lsm.u.error_query.length;
700 ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len);
701 if (ret) {
702 ret_code = LTTNG_ERR_NOMEM;
703 goto end;
704 }
705
706 sock_recv_len = lttcomm_recv_unix_sock(
707 sock, query_payload.buffer.data, query_len);
708 if (sock_recv_len < 0 || sock_recv_len != query_len) {
709 ERR("Failed to receive error query in command payload");
710 *sock_error = 1;
711 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
712 goto end;
713 }
714
715 /* Receive fds, if any. */
716 if (cmd_ctx->lsm.fd_count > 0) {
717 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
718 sock, cmd_ctx->lsm.fd_count, &query_payload);
719 if (sock_recv_len > 0 &&
720 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
721 ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d",
722 cmd_ctx->lsm.fd_count, (int) ret);
723 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
724 *sock_error = 1;
725 goto end;
726 } else if (sock_recv_len <= 0) {
727 ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d",
728 cmd_ctx->lsm.fd_count, (int) ret);
729 ret_code = LTTNG_ERR_FATAL;
730 *sock_error = 1;
731 goto end;
732 }
733 }
734
735 /* Deserialize error query. */
736 {
737 struct lttng_payload_view view =
738 lttng_payload_view_from_payload(
739 &query_payload, 0, -1);
740
741 if (lttng_error_query_create_from_payload(&view, &query) !=
742 query_len) {
743 ERR("Invalid error query received as part of command payload");
744 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
745 goto end;
746 }
747 }
748
749 *_query = query;
750 ret_code = LTTNG_OK;
751
752 end:
753 lttng_payload_reset(&query_payload);
754 return ret_code;
755 }
756
757 static enum lttng_error_code receive_lttng_event(struct command_ctx *cmd_ctx,
758 int sock,
759 int *sock_error,
760 struct lttng_event **out_event,
761 char **out_filter_expression,
762 struct lttng_bytecode **out_bytecode,
763 struct lttng_event_exclusion **out_exclusion)
764 {
765 int ret;
766 size_t event_len;
767 ssize_t sock_recv_len;
768 enum lttng_error_code ret_code;
769 struct lttng_payload event_payload;
770
771 lttng_payload_init(&event_payload);
772 if (cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT) {
773 event_len = (size_t) cmd_ctx->lsm.u.enable.length;
774 } else if (cmd_ctx->lsm.cmd_type == LTTNG_DISABLE_EVENT) {
775 event_len = (size_t) cmd_ctx->lsm.u.disable.length;
776 } else {
777 abort();
778 }
779
780 ret = lttng_dynamic_buffer_set_size(&event_payload.buffer, event_len);
781 if (ret) {
782 ret_code = LTTNG_ERR_NOMEM;
783 goto end;
784 }
785
786 sock_recv_len = lttcomm_recv_unix_sock(
787 sock, event_payload.buffer.data, event_len);
788 if (sock_recv_len < 0 || sock_recv_len != event_len) {
789 ERR("Failed to receive event in command payload");
790 *sock_error = 1;
791 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
792 goto end;
793 }
794
795 /* Receive fds, if any. */
796 if (cmd_ctx->lsm.fd_count > 0) {
797 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
798 sock, cmd_ctx->lsm.fd_count, &event_payload);
799 if (sock_recv_len > 0 &&
800 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
801 ERR("Failed to receive all file descriptors for event in command payload: expected fd count = %u, ret = %d",
802 cmd_ctx->lsm.fd_count, (int) ret);
803 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
804 *sock_error = 1;
805 goto end;
806 } else if (sock_recv_len <= 0) {
807 ERR("Failed to receive file descriptors for event in command payload: expected fd count = %u, ret = %d",
808 cmd_ctx->lsm.fd_count, (int) ret);
809 ret_code = LTTNG_ERR_FATAL;
810 *sock_error = 1;
811 goto end;
812 }
813 }
814
815 /* Deserialize event. */
816 {
817 struct lttng_payload_view event_view =
818 lttng_payload_view_from_payload(
819 &event_payload, 0, -1);
820
821 if (lttng_event_create_from_payload(&event_view, out_event,
822 out_exclusion, out_filter_expression,
823 out_bytecode) != event_len) {
824 ERR("Invalid event received as part of command payload");
825 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
826 goto end;
827 }
828 }
829
830 ret_code = LTTNG_OK;
831
832 end:
833 lttng_payload_reset(&event_payload);
834 return ret_code;
835 }
836
837 /*
838 * Version of setup_lttng_msg() without command header.
839 */
840 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
841 void *payload_buf, size_t payload_len)
842 {
843 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
844 }
845
846 /*
847 * Check if the current kernel tracer supports the session rotation feature.
848 * Return 1 if it does, 0 otherwise.
849 */
850 static int check_rotate_compatible(void)
851 {
852 int ret = 1;
853
854 if (the_kernel_tracer_version.major != 2 ||
855 the_kernel_tracer_version.minor < 11) {
856 DBG("Kernel tracer version is not compatible with the rotation feature");
857 ret = 0;
858 }
859
860 return ret;
861 }
862
863 /*
864 * Send data on a unix socket using the liblttsessiondcomm API.
865 *
866 * Return lttcomm error code.
867 */
868 static int send_unix_sock(int sock, struct lttng_payload_view *view)
869 {
870 int ret;
871 const int fd_count = lttng_payload_view_get_fd_handle_count(view);
872
873 /* Check valid length */
874 if (view->buffer.size == 0) {
875 ret = -1;
876 goto end;
877 }
878
879 ret = lttcomm_send_unix_sock(
880 sock, view->buffer.data, view->buffer.size);
881 if (ret < 0) {
882 goto end;
883 }
884
885 if (fd_count > 0) {
886 ret = lttcomm_send_payload_view_fds_unix_sock(sock, view);
887 if (ret < 0) {
888 goto end;
889 }
890 }
891
892 end:
893 return ret;
894 }
895
896 /*
897 * Process the command requested by the lttng client within the command
898 * context structure. This function make sure that the return structure (llm)
899 * is set and ready for transmission before returning.
900 *
901 * Return any error encountered or 0 for success.
902 *
903 * "sock" is only used for special-case var. len data.
904 * A command may assume the ownership of the socket, in which case its value
905 * should be set to -1.
906 *
907 * Should *NOT* be called with RCU read-side lock held.
908 */
909 static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
910 int *sock_error)
911 {
912 int ret = LTTNG_OK;
913 bool need_tracing_session = true;
914 bool need_domain;
915 bool need_consumerd;
916
917 DBG("Processing client command '%s\' (%d)",
918 lttcomm_sessiond_command_str(cmd_ctx->lsm.cmd_type),
919 cmd_ctx->lsm.cmd_type);
920
921 assert(!rcu_read_ongoing());
922
923 *sock_error = 0;
924
925 switch (cmd_ctx->lsm.cmd_type) {
926 case LTTNG_CREATE_SESSION_EXT:
927 case LTTNG_DESTROY_SESSION:
928 case LTTNG_LIST_SESSIONS:
929 case LTTNG_LIST_DOMAINS:
930 case LTTNG_START_TRACE:
931 case LTTNG_STOP_TRACE:
932 case LTTNG_DATA_PENDING:
933 case LTTNG_SNAPSHOT_ADD_OUTPUT:
934 case LTTNG_SNAPSHOT_DEL_OUTPUT:
935 case LTTNG_SNAPSHOT_LIST_OUTPUT:
936 case LTTNG_SNAPSHOT_RECORD:
937 case LTTNG_SAVE_SESSION:
938 case LTTNG_SET_SESSION_SHM_PATH:
939 case LTTNG_REGENERATE_METADATA:
940 case LTTNG_REGENERATE_STATEDUMP:
941 case LTTNG_ROTATE_SESSION:
942 case LTTNG_ROTATION_GET_INFO:
943 case LTTNG_ROTATION_SET_SCHEDULE:
944 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
945 case LTTNG_CLEAR_SESSION:
946 case LTTNG_LIST_TRIGGERS:
947 case LTTNG_EXECUTE_ERROR_QUERY:
948 need_domain = false;
949 break;
950 default:
951 need_domain = true;
952 }
953
954 /* Needs a functioning consumerd? */
955 switch (cmd_ctx->lsm.cmd_type) {
956 case LTTNG_REGISTER_TRIGGER:
957 case LTTNG_UNREGISTER_TRIGGER:
958 case LTTNG_EXECUTE_ERROR_QUERY:
959 need_consumerd = false;
960 break;
961 default:
962 need_consumerd = true;
963 break;
964 }
965
966 if (the_config.no_kernel && need_domain &&
967 cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) {
968 if (!is_root) {
969 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
970 } else {
971 ret = LTTNG_ERR_KERN_NA;
972 }
973 goto error;
974 }
975
976 /* Deny register consumer if we already have a spawned consumer. */
977 if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) {
978 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
979 if (the_kconsumer_data.pid > 0) {
980 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
981 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
982 goto error;
983 }
984 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
985 }
986
987 /*
988 * Check for command that don't needs to allocate a returned payload. We do
989 * this here so we don't have to make the call for no payload at each
990 * command.
991 */
992 switch(cmd_ctx->lsm.cmd_type) {
993 case LTTNG_LIST_SESSIONS:
994 case LTTNG_LIST_TRACEPOINTS:
995 case LTTNG_LIST_TRACEPOINT_FIELDS:
996 case LTTNG_LIST_DOMAINS:
997 case LTTNG_LIST_CHANNELS:
998 case LTTNG_LIST_EVENTS:
999 case LTTNG_LIST_SYSCALLS:
1000 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1001 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1002 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1003 case LTTNG_DATA_PENDING:
1004 case LTTNG_ROTATE_SESSION:
1005 case LTTNG_ROTATION_GET_INFO:
1006 case LTTNG_REGISTER_TRIGGER:
1007 case LTTNG_LIST_TRIGGERS:
1008 case LTTNG_EXECUTE_ERROR_QUERY:
1009 break;
1010 default:
1011 /* Setup lttng message with no payload */
1012 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
1013 if (ret < 0) {
1014 /* This label does not try to unlock the session */
1015 goto init_setup_error;
1016 }
1017 }
1018
1019 /* Commands that DO NOT need a session. */
1020 switch (cmd_ctx->lsm.cmd_type) {
1021 case LTTNG_CREATE_SESSION_EXT:
1022 case LTTNG_LIST_SESSIONS:
1023 case LTTNG_LIST_TRACEPOINTS:
1024 case LTTNG_LIST_SYSCALLS:
1025 case LTTNG_LIST_TRACEPOINT_FIELDS:
1026 case LTTNG_SAVE_SESSION:
1027 case LTTNG_REGISTER_TRIGGER:
1028 case LTTNG_UNREGISTER_TRIGGER:
1029 case LTTNG_LIST_TRIGGERS:
1030 case LTTNG_EXECUTE_ERROR_QUERY:
1031 need_tracing_session = false;
1032 break;
1033 default:
1034 DBG("Getting session %s by name", cmd_ctx->lsm.session.name);
1035 /*
1036 * We keep the session list lock across _all_ commands
1037 * for now, because the per-session lock does not
1038 * handle teardown properly.
1039 */
1040 session_lock_list();
1041 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name);
1042 if (cmd_ctx->session == NULL) {
1043 ret = LTTNG_ERR_SESS_NOT_FOUND;
1044 goto error;
1045 } else {
1046 /* Acquire lock for the session */
1047 session_lock(cmd_ctx->session);
1048 }
1049 break;
1050 }
1051
1052 /*
1053 * Commands that need a valid session but should NOT create one if none
1054 * exists. Instead of creating one and destroying it when the command is
1055 * handled, process that right before so we save some round trip in useless
1056 * code path.
1057 */
1058 switch (cmd_ctx->lsm.cmd_type) {
1059 case LTTNG_DISABLE_CHANNEL:
1060 case LTTNG_DISABLE_EVENT:
1061 switch (cmd_ctx->lsm.domain.type) {
1062 case LTTNG_DOMAIN_KERNEL:
1063 if (!cmd_ctx->session->kernel_session) {
1064 ret = LTTNG_ERR_NO_CHANNEL;
1065 goto error;
1066 }
1067 break;
1068 case LTTNG_DOMAIN_JUL:
1069 case LTTNG_DOMAIN_LOG4J:
1070 case LTTNG_DOMAIN_PYTHON:
1071 case LTTNG_DOMAIN_UST:
1072 if (!cmd_ctx->session->ust_session) {
1073 ret = LTTNG_ERR_NO_CHANNEL;
1074 goto error;
1075 }
1076 break;
1077 default:
1078 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1079 goto error;
1080 }
1081 default:
1082 break;
1083 }
1084
1085 if (!need_domain) {
1086 goto skip_domain;
1087 }
1088
1089 /*
1090 * Check domain type for specific "pre-action".
1091 */
1092 switch (cmd_ctx->lsm.domain.type) {
1093 case LTTNG_DOMAIN_KERNEL:
1094 if (!is_root) {
1095 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1096 goto error;
1097 }
1098
1099 /* Kernel tracer check */
1100 if (!kernel_tracer_is_initialized()) {
1101 /* Basically, load kernel tracer modules */
1102 ret = init_kernel_tracer();
1103 if (ret != 0) {
1104 goto error;
1105 }
1106 }
1107
1108 /* Consumer is in an ERROR state. Report back to client */
1109 if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) ==
1110 CONSUMER_ERROR) {
1111 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1112 goto error;
1113 }
1114
1115 /* Need a session for kernel command */
1116 if (need_tracing_session) {
1117 if (cmd_ctx->session->kernel_session == NULL) {
1118 ret = create_kernel_session(cmd_ctx->session);
1119 if (ret != LTTNG_OK) {
1120 ret = LTTNG_ERR_KERN_SESS_FAIL;
1121 goto error;
1122 }
1123 }
1124
1125 /* Start the kernel consumer daemon */
1126 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1127 if (the_kconsumer_data.pid == 0 &&
1128 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1129 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1130 ret = start_consumerd(&the_kconsumer_data);
1131 if (ret < 0) {
1132 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1133 goto error;
1134 }
1135 uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED);
1136 } else {
1137 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1138 }
1139
1140 /*
1141 * The consumer was just spawned so we need to add the socket to
1142 * the consumer output of the session if exist.
1143 */
1144 ret = consumer_create_socket(&the_kconsumer_data,
1145 cmd_ctx->session->kernel_session->consumer);
1146 if (ret < 0) {
1147 goto error;
1148 }
1149 }
1150
1151 break;
1152 case LTTNG_DOMAIN_JUL:
1153 case LTTNG_DOMAIN_LOG4J:
1154 case LTTNG_DOMAIN_PYTHON:
1155 if (!agent_tracing_is_enabled()) {
1156 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1157 goto error;
1158 }
1159 /* Fallthrough */
1160 case LTTNG_DOMAIN_UST:
1161 {
1162 if (!ust_app_supported()) {
1163 ret = LTTNG_ERR_NO_UST;
1164 goto error;
1165 }
1166
1167 /* Consumer is in an ERROR state. Report back to client */
1168 if (need_consumerd &&
1169 uatomic_read(&the_ust_consumerd_state) ==
1170 CONSUMER_ERROR) {
1171 ret = LTTNG_ERR_NO_USTCONSUMERD;
1172 goto error;
1173 }
1174
1175 if (need_tracing_session) {
1176 /* Create UST session if none exist. */
1177 if (cmd_ctx->session->ust_session == NULL) {
1178 ret = create_ust_session(cmd_ctx->session,
1179 ALIGNED_CONST_PTR(cmd_ctx->lsm.domain));
1180 if (ret != LTTNG_OK) {
1181 goto error;
1182 }
1183 }
1184
1185 /* Start the UST consumer daemons */
1186 /* 64-bit */
1187 pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex);
1188 if (the_config.consumerd64_bin_path.value &&
1189 the_ustconsumer64_data.pid == 0 &&
1190 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1191 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1192 ret = start_consumerd(&the_ustconsumer64_data);
1193 if (ret < 0) {
1194 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
1195 uatomic_set(&the_ust_consumerd64_fd, -EINVAL);
1196 goto error;
1197 }
1198
1199 uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock);
1200 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1201 } else {
1202 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1203 }
1204
1205 /*
1206 * Setup socket for consumer 64 bit. No need for atomic access
1207 * since it was set above and can ONLY be set in this thread.
1208 */
1209 ret = consumer_create_socket(&the_ustconsumer64_data,
1210 cmd_ctx->session->ust_session->consumer);
1211 if (ret < 0) {
1212 goto error;
1213 }
1214
1215 /* 32-bit */
1216 pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex);
1217 if (the_config.consumerd32_bin_path.value &&
1218 the_ustconsumer32_data.pid == 0 &&
1219 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1220 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1221 ret = start_consumerd(&the_ustconsumer32_data);
1222 if (ret < 0) {
1223 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
1224 uatomic_set(&the_ust_consumerd32_fd, -EINVAL);
1225 goto error;
1226 }
1227
1228 uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock);
1229 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1230 } else {
1231 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1232 }
1233
1234 /*
1235 * Setup socket for consumer 32 bit. No need for atomic access
1236 * since it was set above and can ONLY be set in this thread.
1237 */
1238 ret = consumer_create_socket(&the_ustconsumer32_data,
1239 cmd_ctx->session->ust_session->consumer);
1240 if (ret < 0) {
1241 goto error;
1242 }
1243 }
1244 break;
1245 }
1246 default:
1247 break;
1248 }
1249 skip_domain:
1250
1251 /* Validate consumer daemon state when start/stop trace command */
1252 if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE ||
1253 cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) {
1254 switch (cmd_ctx->lsm.domain.type) {
1255 case LTTNG_DOMAIN_NONE:
1256 break;
1257 case LTTNG_DOMAIN_JUL:
1258 case LTTNG_DOMAIN_LOG4J:
1259 case LTTNG_DOMAIN_PYTHON:
1260 case LTTNG_DOMAIN_UST:
1261 if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) {
1262 ret = LTTNG_ERR_NO_USTCONSUMERD;
1263 goto error;
1264 }
1265 break;
1266 case LTTNG_DOMAIN_KERNEL:
1267 if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) {
1268 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1269 goto error;
1270 }
1271 break;
1272 default:
1273 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1274 goto error;
1275 }
1276 }
1277
1278 /*
1279 * Check that the UID matches that of the tracing session.
1280 * The root user can interact with all sessions.
1281 */
1282 if (need_tracing_session) {
1283 if (!session_access_ok(cmd_ctx->session,
1284 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) ||
1285 cmd_ctx->session->destroyed) {
1286 ret = LTTNG_ERR_EPERM;
1287 goto error;
1288 }
1289 }
1290
1291 /*
1292 * Send relayd information to consumer as soon as we have a domain and a
1293 * session defined.
1294 */
1295 if (cmd_ctx->session && need_domain) {
1296 /*
1297 * Setup relayd if not done yet. If the relayd information was already
1298 * sent to the consumer, this call will gracefully return.
1299 */
1300 ret = cmd_setup_relayd(cmd_ctx->session);
1301 if (ret != LTTNG_OK) {
1302 goto error;
1303 }
1304 }
1305
1306 /* Process by command type */
1307 switch (cmd_ctx->lsm.cmd_type) {
1308 case LTTNG_ADD_CONTEXT:
1309 {
1310 /*
1311 * An LTTNG_ADD_CONTEXT command might have a supplementary
1312 * payload if the context being added is an application context.
1313 */
1314 if (cmd_ctx->lsm.u.context.ctx.ctx ==
1315 LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1316 char *provider_name = NULL, *context_name = NULL;
1317 size_t provider_name_len =
1318 cmd_ctx->lsm.u.context.provider_name_len;
1319 size_t context_name_len =
1320 cmd_ctx->lsm.u.context.context_name_len;
1321
1322 if (provider_name_len == 0 || context_name_len == 0) {
1323 /*
1324 * Application provider and context names MUST
1325 * be provided.
1326 */
1327 ret = -LTTNG_ERR_INVALID;
1328 goto error;
1329 }
1330
1331 provider_name = zmalloc(provider_name_len + 1);
1332 if (!provider_name) {
1333 ret = -LTTNG_ERR_NOMEM;
1334 goto error;
1335 }
1336 cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name =
1337 provider_name;
1338
1339 context_name = zmalloc(context_name_len + 1);
1340 if (!context_name) {
1341 ret = -LTTNG_ERR_NOMEM;
1342 goto error_add_context;
1343 }
1344 cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name =
1345 context_name;
1346
1347 ret = lttcomm_recv_unix_sock(*sock, provider_name,
1348 provider_name_len);
1349 if (ret < 0) {
1350 goto error_add_context;
1351 }
1352
1353 ret = lttcomm_recv_unix_sock(*sock, context_name,
1354 context_name_len);
1355 if (ret < 0) {
1356 goto error_add_context;
1357 }
1358 }
1359
1360 /*
1361 * cmd_add_context assumes ownership of the provider and context
1362 * names.
1363 */
1364 ret = cmd_add_context(cmd_ctx->session,
1365 cmd_ctx->lsm.domain.type,
1366 cmd_ctx->lsm.u.context.channel_name,
1367 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.context.ctx),
1368 the_kernel_poll_pipe[1]);
1369
1370 cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
1371 cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
1372 error_add_context:
1373 free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.provider_name);
1374 free(cmd_ctx->lsm.u.context.ctx.u.app_ctx.ctx_name);
1375 if (ret < 0) {
1376 goto error;
1377 }
1378 break;
1379 }
1380 case LTTNG_DISABLE_CHANNEL:
1381 {
1382 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1383 cmd_ctx->lsm.u.disable.channel_name);
1384 break;
1385 }
1386 case LTTNG_ENABLE_CHANNEL:
1387 {
1388 ret = cmd_enable_channel(
1389 cmd_ctx, *sock, the_kernel_poll_pipe[1]);
1390 break;
1391 }
1392 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE:
1393 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE:
1394 {
1395 struct lttng_dynamic_buffer payload;
1396 struct lttng_buffer_view payload_view;
1397 const bool add_value =
1398 cmd_ctx->lsm.cmd_type ==
1399 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE;
1400 const size_t name_len =
1401 cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1402 .name_len;
1403 const enum lttng_domain_type domain_type =
1404 (enum lttng_domain_type)
1405 cmd_ctx->lsm.domain.type;
1406 const enum lttng_process_attr process_attr =
1407 (enum lttng_process_attr) cmd_ctx->lsm.u
1408 .process_attr_tracker_add_remove_include_value
1409 .process_attr;
1410 const enum lttng_process_attr_value_type value_type =
1411 (enum lttng_process_attr_value_type) cmd_ctx
1412 ->lsm.u
1413 .process_attr_tracker_add_remove_include_value
1414 .value_type;
1415 struct process_attr_value *value;
1416 enum lttng_error_code ret_code;
1417 long login_name_max;
1418
1419 login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
1420 if (login_name_max < 0) {
1421 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1422 ret = LTTNG_ERR_INVALID;
1423 goto error;
1424 }
1425
1426 /* Receive remaining variable length payload if applicable. */
1427 if (name_len > login_name_max) {
1428 /*
1429 * POSIX mandates user and group names that are at least
1430 * 8 characters long. Note that although shadow-utils
1431 * (useradd, groupaadd, etc.) use 32 chars as their
1432 * limit (from bits/utmp.h, UT_NAMESIZE),
1433 * LOGIN_NAME_MAX is defined to 256.
1434 */
1435 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1436 add_value ? "addition" : "removal",
1437 name_len, login_name_max);
1438 ret = LTTNG_ERR_INVALID;
1439 goto error;
1440 }
1441
1442 lttng_dynamic_buffer_init(&payload);
1443 if (name_len != 0) {
1444 /*
1445 * Receive variable payload for user/group name
1446 * arguments.
1447 */
1448 ret = lttng_dynamic_buffer_set_size(&payload, name_len);
1449 if (ret) {
1450 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1451 add_value ? "add" : "remove");
1452 ret = LTTNG_ERR_NOMEM;
1453 goto error_add_remove_tracker_value;
1454 }
1455
1456 ret = lttcomm_recv_unix_sock(
1457 *sock, payload.data, name_len);
1458 if (ret <= 0) {
1459 ERR("Failed to receive payload of %s process attribute tracker value argument",
1460 add_value ? "add" : "remove");
1461 *sock_error = 1;
1462 ret = LTTNG_ERR_INVALID_PROTOCOL;
1463 goto error_add_remove_tracker_value;
1464 }
1465 }
1466
1467 payload_view = lttng_buffer_view_from_dynamic_buffer(
1468 &payload, 0, name_len);
1469 if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) {
1470 ret = LTTNG_ERR_INVALID_PROTOCOL;
1471 goto error_add_remove_tracker_value;
1472 }
1473
1474 /*
1475 * Validate the value type and domains are legal for the process
1476 * attribute tracker that is specified and convert the value to
1477 * add/remove to the internal sessiond representation.
1478 */
1479 ret_code = process_attr_value_from_comm(domain_type,
1480 process_attr, value_type,
1481 &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1482 .integral_value,
1483 &payload_view, &value);
1484 if (ret_code != LTTNG_OK) {
1485 ret = ret_code;
1486 goto error_add_remove_tracker_value;
1487 }
1488
1489 if (add_value) {
1490 ret = cmd_process_attr_tracker_inclusion_set_add_value(
1491 cmd_ctx->session, domain_type,
1492 process_attr, value);
1493 } else {
1494 ret = cmd_process_attr_tracker_inclusion_set_remove_value(
1495 cmd_ctx->session, domain_type,
1496 process_attr, value);
1497 }
1498 process_attr_value_destroy(value);
1499 error_add_remove_tracker_value:
1500 lttng_dynamic_buffer_reset(&payload);
1501 break;
1502 }
1503 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1504 {
1505 enum lttng_tracking_policy tracking_policy;
1506 const enum lttng_domain_type domain_type =
1507 (enum lttng_domain_type)
1508 cmd_ctx->lsm.domain.type;
1509 const enum lttng_process_attr process_attr =
1510 (enum lttng_process_attr) cmd_ctx->lsm.u
1511 .process_attr_tracker_get_tracking_policy
1512 .process_attr;
1513
1514 ret = cmd_process_attr_tracker_get_tracking_policy(
1515 cmd_ctx->session, domain_type, process_attr,
1516 &tracking_policy);
1517 if (ret != LTTNG_OK) {
1518 goto error;
1519 }
1520
1521 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1522 &(uint32_t){tracking_policy}, sizeof(uint32_t));
1523 if (ret < 0) {
1524 ret = LTTNG_ERR_NOMEM;
1525 goto error;
1526 }
1527 ret = LTTNG_OK;
1528 break;
1529 }
1530 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY:
1531 {
1532 const enum lttng_tracking_policy tracking_policy =
1533 (enum lttng_tracking_policy) cmd_ctx->lsm.u
1534 .process_attr_tracker_set_tracking_policy
1535 .tracking_policy;
1536 const enum lttng_domain_type domain_type =
1537 (enum lttng_domain_type)
1538 cmd_ctx->lsm.domain.type;
1539 const enum lttng_process_attr process_attr =
1540 (enum lttng_process_attr) cmd_ctx->lsm.u
1541 .process_attr_tracker_set_tracking_policy
1542 .process_attr;
1543
1544 ret = cmd_process_attr_tracker_set_tracking_policy(
1545 cmd_ctx->session, domain_type, process_attr,
1546 tracking_policy);
1547 if (ret != LTTNG_OK) {
1548 goto error;
1549 }
1550 break;
1551 }
1552 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1553 {
1554 struct lttng_process_attr_values *values;
1555 struct lttng_dynamic_buffer reply;
1556 const enum lttng_domain_type domain_type =
1557 (enum lttng_domain_type)
1558 cmd_ctx->lsm.domain.type;
1559 const enum lttng_process_attr process_attr =
1560 (enum lttng_process_attr) cmd_ctx->lsm.u
1561 .process_attr_tracker_get_inclusion_set
1562 .process_attr;
1563
1564 ret = cmd_process_attr_tracker_get_inclusion_set(
1565 cmd_ctx->session, domain_type, process_attr,
1566 &values);
1567 if (ret != LTTNG_OK) {
1568 goto error;
1569 }
1570
1571 lttng_dynamic_buffer_init(&reply);
1572 ret = lttng_process_attr_values_serialize(values, &reply);
1573 if (ret < 0) {
1574 goto error_tracker_get_inclusion_set;
1575 }
1576
1577 ret = setup_lttng_msg_no_cmd_header(
1578 cmd_ctx, reply.data, reply.size);
1579 if (ret < 0) {
1580 ret = LTTNG_ERR_NOMEM;
1581 goto error_tracker_get_inclusion_set;
1582 }
1583 ret = LTTNG_OK;
1584
1585 error_tracker_get_inclusion_set:
1586 lttng_process_attr_values_destroy(values);
1587 lttng_dynamic_buffer_reset(&reply);
1588 break;
1589 }
1590 case LTTNG_ENABLE_EVENT:
1591 case LTTNG_DISABLE_EVENT:
1592 {
1593 struct lttng_event *event;
1594 char *filter_expression;
1595 struct lttng_event_exclusion *exclusions;
1596 struct lttng_bytecode *bytecode;
1597 const enum lttng_error_code ret_code = receive_lttng_event(
1598 cmd_ctx, *sock, sock_error, &event,
1599 &filter_expression, &bytecode, &exclusions);
1600
1601 if (ret_code != LTTNG_OK) {
1602 ret = (int) ret_code;
1603 goto error;
1604 }
1605
1606 /*
1607 * Ownership of filter_expression, exclusions, and bytecode is
1608 * always transferred.
1609 */
1610 ret = cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT ?
1611 cmd_enable_event(cmd_ctx, event,
1612 filter_expression, exclusions,
1613 bytecode,
1614 the_kernel_poll_pipe[1]) :
1615 cmd_disable_event(cmd_ctx, event,
1616 filter_expression, bytecode,
1617 exclusions);
1618 lttng_event_destroy(event);
1619 break;
1620 }
1621 case LTTNG_LIST_TRACEPOINTS:
1622 {
1623 enum lttng_error_code ret_code;
1624 size_t original_payload_size;
1625 size_t payload_size;
1626 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1627
1628 ret = setup_empty_lttng_msg(cmd_ctx);
1629 if (ret) {
1630 ret = LTTNG_ERR_NOMEM;
1631 goto setup_error;
1632 }
1633
1634 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1635
1636 session_lock_list();
1637 ret_code = cmd_list_tracepoints(cmd_ctx->lsm.domain.type,
1638 &cmd_ctx->reply_payload);
1639 session_unlock_list();
1640 if (ret_code != LTTNG_OK) {
1641 ret = (int) ret_code;
1642 goto error;
1643 }
1644
1645 payload_size = cmd_ctx->reply_payload.buffer.size -
1646 command_header_size - original_payload_size;
1647 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1648
1649 ret = LTTNG_OK;
1650 break;
1651 }
1652 case LTTNG_LIST_TRACEPOINT_FIELDS:
1653 {
1654 struct lttng_event_field *fields;
1655 ssize_t nb_fields;
1656
1657 session_lock_list();
1658 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm.domain.type,
1659 &fields);
1660 session_unlock_list();
1661 if (nb_fields < 0) {
1662 /* Return value is a negative lttng_error_code. */
1663 ret = -nb_fields;
1664 goto error;
1665 }
1666
1667 /*
1668 * Setup lttng message with payload size set to the event list size in
1669 * bytes and then copy list into the llm payload.
1670 */
1671 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields,
1672 sizeof(struct lttng_event_field) * nb_fields);
1673 free(fields);
1674
1675 if (ret < 0) {
1676 goto setup_error;
1677 }
1678
1679 ret = LTTNG_OK;
1680 break;
1681 }
1682 case LTTNG_LIST_SYSCALLS:
1683 {
1684 enum lttng_error_code ret_code;
1685 size_t original_payload_size;
1686 size_t payload_size;
1687 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1688
1689 ret = setup_empty_lttng_msg(cmd_ctx);
1690 if (ret) {
1691 ret = LTTNG_ERR_NOMEM;
1692 goto setup_error;
1693 }
1694
1695 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1696
1697 ret_code = cmd_list_syscalls(&cmd_ctx->reply_payload);
1698 if (ret_code != LTTNG_OK) {
1699 ret = (int) ret_code;
1700 goto error;
1701 }
1702
1703 payload_size = cmd_ctx->reply_payload.buffer.size -
1704 command_header_size - original_payload_size;
1705 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1706
1707 ret = LTTNG_OK;
1708 break;
1709 }
1710 case LTTNG_SET_CONSUMER_URI:
1711 {
1712 size_t nb_uri, len;
1713 struct lttng_uri *uris;
1714
1715 nb_uri = cmd_ctx->lsm.u.uri.size;
1716 len = nb_uri * sizeof(struct lttng_uri);
1717
1718 if (nb_uri == 0) {
1719 ret = LTTNG_ERR_INVALID;
1720 goto error;
1721 }
1722
1723 uris = zmalloc(len);
1724 if (uris == NULL) {
1725 ret = LTTNG_ERR_FATAL;
1726 goto error;
1727 }
1728
1729 /* Receive variable len data */
1730 DBG("Receiving %zu URI(s) from client ...", nb_uri);
1731 ret = lttcomm_recv_unix_sock(*sock, uris, len);
1732 if (ret <= 0) {
1733 DBG("No URIs received from client... continuing");
1734 *sock_error = 1;
1735 ret = LTTNG_ERR_SESSION_FAIL;
1736 free(uris);
1737 goto error;
1738 }
1739
1740 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
1741 free(uris);
1742 if (ret != LTTNG_OK) {
1743 goto error;
1744 }
1745
1746
1747 break;
1748 }
1749 case LTTNG_START_TRACE:
1750 {
1751 /*
1752 * On the first start, if we have a kernel session and we have
1753 * enabled time or size-based rotations, we have to make sure
1754 * the kernel tracer supports it.
1755 */
1756 if (!cmd_ctx->session->has_been_started && \
1757 cmd_ctx->session->kernel_session && \
1758 (cmd_ctx->session->rotate_timer_period || \
1759 cmd_ctx->session->rotate_size) && \
1760 !check_rotate_compatible()) {
1761 DBG("Kernel tracer version is not compatible with the rotation feature");
1762 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
1763 goto error;
1764 }
1765 ret = cmd_start_trace(cmd_ctx->session);
1766 break;
1767 }
1768 case LTTNG_STOP_TRACE:
1769 {
1770 ret = cmd_stop_trace(cmd_ctx->session);
1771 break;
1772 }
1773 case LTTNG_DESTROY_SESSION:
1774 {
1775 ret = cmd_destroy_session(cmd_ctx->session,
1776 the_notification_thread_handle, sock);
1777 break;
1778 }
1779 case LTTNG_LIST_DOMAINS:
1780 {
1781 ssize_t nb_dom;
1782 struct lttng_domain *domains = NULL;
1783
1784 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
1785 if (nb_dom < 0) {
1786 /* Return value is a negative lttng_error_code. */
1787 ret = -nb_dom;
1788 goto error;
1789 }
1790
1791 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
1792 nb_dom * sizeof(struct lttng_domain));
1793 free(domains);
1794
1795 if (ret < 0) {
1796 goto setup_error;
1797 }
1798
1799 ret = LTTNG_OK;
1800 break;
1801 }
1802 case LTTNG_LIST_CHANNELS:
1803 {
1804 enum lttng_error_code ret_code;
1805 size_t original_payload_size;
1806 size_t payload_size;
1807 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1808
1809 ret = setup_empty_lttng_msg(cmd_ctx);
1810 if (ret) {
1811 ret = LTTNG_ERR_NOMEM;
1812 goto setup_error;
1813 }
1814
1815 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1816
1817 ret_code = cmd_list_channels(cmd_ctx->lsm.domain.type,
1818 cmd_ctx->session, &cmd_ctx->reply_payload);
1819 if (ret_code != LTTNG_OK) {
1820 ret = (int) ret_code;
1821 goto error;
1822 }
1823
1824 payload_size = cmd_ctx->reply_payload.buffer.size -
1825 command_header_size - original_payload_size;
1826 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1827
1828 ret = LTTNG_OK;
1829 break;
1830 }
1831 case LTTNG_LIST_EVENTS:
1832 {
1833 enum lttng_error_code ret_code;
1834 size_t original_payload_size;
1835 size_t payload_size;
1836 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1837
1838 ret = setup_empty_lttng_msg(cmd_ctx);
1839 if (ret) {
1840 ret = LTTNG_ERR_NOMEM;
1841 goto setup_error;
1842 }
1843
1844 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1845
1846 ret_code = cmd_list_events(cmd_ctx->lsm.domain.type,
1847 cmd_ctx->session,
1848 cmd_ctx->lsm.u.list.channel_name, &cmd_ctx->reply_payload);
1849 if (ret_code != LTTNG_OK) {
1850 ret = (int) ret_code;
1851 goto error;
1852 }
1853
1854 payload_size = cmd_ctx->reply_payload.buffer.size -
1855 command_header_size - original_payload_size;
1856 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1857
1858 ret = LTTNG_OK;
1859 break;
1860 }
1861 case LTTNG_LIST_SESSIONS:
1862 {
1863 unsigned int nr_sessions;
1864 void *sessions_payload;
1865 size_t payload_len;
1866
1867 session_lock_list();
1868 nr_sessions = lttng_sessions_count(
1869 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1870 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1871
1872 payload_len = (sizeof(struct lttng_session) * nr_sessions) +
1873 (sizeof(struct lttng_session_extended) * nr_sessions);
1874 sessions_payload = zmalloc(payload_len);
1875
1876 if (!sessions_payload) {
1877 session_unlock_list();
1878 ret = -ENOMEM;
1879 goto setup_error;
1880 }
1881
1882 cmd_list_lttng_sessions(sessions_payload, nr_sessions,
1883 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1884 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1885 session_unlock_list();
1886
1887 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload,
1888 payload_len);
1889 free(sessions_payload);
1890
1891 if (ret < 0) {
1892 goto setup_error;
1893 }
1894
1895 ret = LTTNG_OK;
1896 break;
1897 }
1898 case LTTNG_REGISTER_CONSUMER:
1899 {
1900 struct consumer_data *cdata;
1901
1902 switch (cmd_ctx->lsm.domain.type) {
1903 case LTTNG_DOMAIN_KERNEL:
1904 cdata = &the_kconsumer_data;
1905 break;
1906 default:
1907 ret = LTTNG_ERR_UND;
1908 goto error;
1909 }
1910
1911 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1912 cmd_ctx->lsm.u.reg.path, cdata);
1913 break;
1914 }
1915 case LTTNG_DATA_PENDING:
1916 {
1917 int pending_ret;
1918 uint8_t pending_ret_byte;
1919
1920 pending_ret = cmd_data_pending(cmd_ctx->session);
1921
1922 /*
1923 * FIXME
1924 *
1925 * This function may returns 0 or 1 to indicate whether or not
1926 * there is data pending. In case of error, it should return an
1927 * LTTNG_ERR code. However, some code paths may still return
1928 * a nondescript error code, which we handle by returning an
1929 * "unknown" error.
1930 */
1931 if (pending_ret == 0 || pending_ret == 1) {
1932 /*
1933 * ret will be set to LTTNG_OK at the end of
1934 * this function.
1935 */
1936 } else if (pending_ret < 0) {
1937 ret = LTTNG_ERR_UNK;
1938 goto setup_error;
1939 } else {
1940 ret = pending_ret;
1941 goto setup_error;
1942 }
1943
1944 pending_ret_byte = (uint8_t) pending_ret;
1945
1946 /* 1 byte to return whether or not data is pending */
1947 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1948 &pending_ret_byte, 1);
1949
1950 if (ret < 0) {
1951 goto setup_error;
1952 }
1953
1954 ret = LTTNG_OK;
1955 break;
1956 }
1957 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1958 {
1959 uint32_t snapshot_id;
1960 struct lttcomm_lttng_output_id reply;
1961
1962 ret = cmd_snapshot_add_output(cmd_ctx->session,
1963 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output),
1964 &snapshot_id);
1965 if (ret != LTTNG_OK) {
1966 goto error;
1967 }
1968 reply.id = snapshot_id;
1969
1970 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
1971 sizeof(reply));
1972 if (ret < 0) {
1973 goto setup_error;
1974 }
1975
1976 /* Copy output list into message payload */
1977 ret = LTTNG_OK;
1978 break;
1979 }
1980 case LTTNG_SNAPSHOT_DEL_OUTPUT:
1981 {
1982 ret = cmd_snapshot_del_output(cmd_ctx->session,
1983 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output));
1984 break;
1985 }
1986 case LTTNG_SNAPSHOT_LIST_OUTPUT:
1987 {
1988 ssize_t nb_output;
1989 struct lttng_snapshot_output *outputs = NULL;
1990
1991 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
1992 if (nb_output < 0) {
1993 ret = -nb_output;
1994 goto error;
1995 }
1996
1997 assert((nb_output > 0 && outputs) || nb_output == 0);
1998 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
1999 nb_output * sizeof(struct lttng_snapshot_output));
2000 free(outputs);
2001
2002 if (ret < 0) {
2003 goto setup_error;
2004 }
2005
2006 ret = LTTNG_OK;
2007 break;
2008 }
2009 case LTTNG_SNAPSHOT_RECORD:
2010 {
2011 ret = cmd_snapshot_record(cmd_ctx->session,
2012 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_record.output),
2013 cmd_ctx->lsm.u.snapshot_record.wait);
2014 break;
2015 }
2016 case LTTNG_CREATE_SESSION_EXT:
2017 {
2018 struct lttng_dynamic_buffer payload;
2019 struct lttng_session_descriptor *return_descriptor = NULL;
2020
2021 lttng_dynamic_buffer_init(&payload);
2022 ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor);
2023 if (ret != LTTNG_OK) {
2024 goto error;
2025 }
2026
2027 ret = lttng_session_descriptor_serialize(return_descriptor,
2028 &payload);
2029 if (ret) {
2030 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2031 lttng_session_descriptor_destroy(return_descriptor);
2032 ret = LTTNG_ERR_NOMEM;
2033 goto error;
2034 }
2035 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data,
2036 payload.size);
2037 if (ret) {
2038 lttng_session_descriptor_destroy(return_descriptor);
2039 ret = LTTNG_ERR_NOMEM;
2040 goto error;
2041 }
2042 lttng_dynamic_buffer_reset(&payload);
2043 lttng_session_descriptor_destroy(return_descriptor);
2044 ret = LTTNG_OK;
2045 break;
2046 }
2047 case LTTNG_SAVE_SESSION:
2048 {
2049 ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr,
2050 &cmd_ctx->creds);
2051 break;
2052 }
2053 case LTTNG_SET_SESSION_SHM_PATH:
2054 {
2055 ret = cmd_set_session_shm_path(cmd_ctx->session,
2056 cmd_ctx->lsm.u.set_shm_path.shm_path);
2057 break;
2058 }
2059 case LTTNG_REGENERATE_METADATA:
2060 {
2061 ret = cmd_regenerate_metadata(cmd_ctx->session);
2062 break;
2063 }
2064 case LTTNG_REGENERATE_STATEDUMP:
2065 {
2066 ret = cmd_regenerate_statedump(cmd_ctx->session);
2067 break;
2068 }
2069 case LTTNG_REGISTER_TRIGGER:
2070 {
2071 struct lttng_trigger *payload_trigger;
2072 struct lttng_trigger *return_trigger;
2073 size_t original_reply_payload_size;
2074 size_t reply_payload_size;
2075 const struct lttng_credentials cmd_creds = {
2076 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2077 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2078 };
2079
2080 ret = setup_empty_lttng_msg(cmd_ctx);
2081 if (ret) {
2082 ret = LTTNG_ERR_NOMEM;
2083 goto setup_error;
2084 }
2085
2086 ret = receive_lttng_trigger(
2087 cmd_ctx, *sock, sock_error, &payload_trigger);
2088 if (ret != LTTNG_OK) {
2089 goto error;
2090 }
2091
2092 original_reply_payload_size = cmd_ctx->reply_payload.buffer.size;
2093
2094 ret = cmd_register_trigger(&cmd_creds, payload_trigger,
2095 cmd_ctx->lsm.u.trigger.is_trigger_anonymous,
2096 the_notification_thread_handle,
2097 &return_trigger);
2098 if (ret != LTTNG_OK) {
2099 lttng_trigger_put(payload_trigger);
2100 goto error;
2101 }
2102
2103 ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload);
2104 lttng_trigger_put(payload_trigger);
2105 lttng_trigger_put(return_trigger);
2106 if (ret) {
2107 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2108 ret = LTTNG_ERR_NOMEM;
2109 goto error;
2110 }
2111
2112 reply_payload_size = cmd_ctx->reply_payload.buffer.size -
2113 original_reply_payload_size;
2114
2115 update_lttng_msg(cmd_ctx, 0, reply_payload_size);
2116
2117 ret = LTTNG_OK;
2118 break;
2119 }
2120 case LTTNG_UNREGISTER_TRIGGER:
2121 {
2122 struct lttng_trigger *payload_trigger;
2123 const struct lttng_credentials cmd_creds = {
2124 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2125 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2126 };
2127
2128 ret = receive_lttng_trigger(
2129 cmd_ctx, *sock, sock_error, &payload_trigger);
2130 if (ret != LTTNG_OK) {
2131 goto error;
2132 }
2133
2134 ret = cmd_unregister_trigger(&cmd_creds, payload_trigger,
2135 the_notification_thread_handle);
2136 lttng_trigger_put(payload_trigger);
2137 break;
2138 }
2139 case LTTNG_ROTATE_SESSION:
2140 {
2141 struct lttng_rotate_session_return rotate_return;
2142
2143 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
2144
2145 memset(&rotate_return, 0, sizeof(rotate_return));
2146 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2147 DBG("Kernel tracer version is not compatible with the rotation feature");
2148 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2149 goto error;
2150 }
2151
2152 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return,
2153 false,
2154 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
2155 if (ret < 0) {
2156 ret = -ret;
2157 goto error;
2158 }
2159
2160 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
2161 sizeof(rotate_return));
2162 if (ret < 0) {
2163 ret = -ret;
2164 goto error;
2165 }
2166
2167 ret = LTTNG_OK;
2168 break;
2169 }
2170 case LTTNG_ROTATION_GET_INFO:
2171 {
2172 struct lttng_rotation_get_info_return get_info_return;
2173
2174 memset(&get_info_return, 0, sizeof(get_info_return));
2175 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
2176 cmd_ctx->lsm.u.get_rotation_info.rotation_id);
2177 if (ret < 0) {
2178 ret = -ret;
2179 goto error;
2180 }
2181
2182 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
2183 sizeof(get_info_return));
2184 if (ret < 0) {
2185 ret = -ret;
2186 goto error;
2187 }
2188
2189 ret = LTTNG_OK;
2190 break;
2191 }
2192 case LTTNG_ROTATION_SET_SCHEDULE:
2193 {
2194 bool set_schedule;
2195 enum lttng_rotation_schedule_type schedule_type;
2196 uint64_t value;
2197
2198 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2199 DBG("Kernel tracer version does not support session rotations");
2200 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2201 goto error;
2202 }
2203
2204 set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1;
2205 schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type;
2206 value = cmd_ctx->lsm.u.rotation_set_schedule.value;
2207
2208 ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule,
2209 schedule_type, value,
2210 the_notification_thread_handle);
2211 if (ret != LTTNG_OK) {
2212 goto error;
2213 }
2214
2215 break;
2216 }
2217 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
2218 {
2219 struct lttng_session_list_schedules_return schedules = {
2220 .periodic.set = !!cmd_ctx->session->rotate_timer_period,
2221 .periodic.value = cmd_ctx->session->rotate_timer_period,
2222 .size.set = !!cmd_ctx->session->rotate_size,
2223 .size.value = cmd_ctx->session->rotate_size,
2224 };
2225
2226 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
2227 sizeof(schedules));
2228 if (ret < 0) {
2229 ret = -ret;
2230 goto error;
2231 }
2232
2233 ret = LTTNG_OK;
2234 break;
2235 }
2236 case LTTNG_CLEAR_SESSION:
2237 {
2238 ret = cmd_clear_session(cmd_ctx->session, sock);
2239 break;
2240 }
2241 case LTTNG_LIST_TRIGGERS:
2242 {
2243 struct lttng_triggers *return_triggers = NULL;
2244 size_t original_payload_size;
2245 size_t payload_size;
2246
2247 ret = setup_empty_lttng_msg(cmd_ctx);
2248 if (ret) {
2249 ret = LTTNG_ERR_NOMEM;
2250 goto setup_error;
2251 }
2252
2253 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2254
2255 ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle,
2256 &return_triggers);
2257 if (ret != LTTNG_OK) {
2258 goto error;
2259 }
2260
2261 assert(return_triggers);
2262 ret = lttng_triggers_serialize(
2263 return_triggers, &cmd_ctx->reply_payload);
2264 lttng_triggers_destroy(return_triggers);
2265 if (ret) {
2266 ERR("Failed to serialize triggers in reply to `list triggers` command");
2267 ret = LTTNG_ERR_NOMEM;
2268 goto error;
2269 }
2270
2271 payload_size = cmd_ctx->reply_payload.buffer.size -
2272 original_payload_size;
2273
2274 update_lttng_msg(cmd_ctx, 0, payload_size);
2275
2276 ret = LTTNG_OK;
2277 break;
2278 }
2279 case LTTNG_EXECUTE_ERROR_QUERY:
2280 {
2281 struct lttng_error_query *query;
2282 const struct lttng_credentials cmd_creds = {
2283 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2284 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2285 };
2286 struct lttng_error_query_results *results = NULL;
2287 size_t original_payload_size;
2288 size_t payload_size;
2289
2290 ret = setup_empty_lttng_msg(cmd_ctx);
2291 if (ret) {
2292 ret = LTTNG_ERR_NOMEM;
2293 goto setup_error;
2294 }
2295
2296 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2297
2298 ret = receive_lttng_error_query(
2299 cmd_ctx, *sock, sock_error, &query);
2300 if (ret != LTTNG_OK) {
2301 goto error;
2302 }
2303
2304 ret = cmd_execute_error_query(&cmd_creds, query, &results,
2305 the_notification_thread_handle);
2306 lttng_error_query_destroy(query);
2307 if (ret != LTTNG_OK) {
2308 goto error;
2309 }
2310
2311 assert(results);
2312 ret = lttng_error_query_results_serialize(
2313 results, &cmd_ctx->reply_payload);
2314 lttng_error_query_results_destroy(results);
2315 if (ret) {
2316 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2317 ret = LTTNG_ERR_NOMEM;
2318 goto error;
2319 }
2320
2321 payload_size = cmd_ctx->reply_payload.buffer.size -
2322 original_payload_size;
2323
2324 update_lttng_msg(cmd_ctx, 0, payload_size);
2325
2326 ret = LTTNG_OK;
2327
2328 break;
2329 }
2330 default:
2331 ret = LTTNG_ERR_UND;
2332 break;
2333 }
2334
2335 error:
2336 if (cmd_ctx->reply_payload.buffer.size == 0) {
2337 DBG("Missing llm header, creating one.");
2338 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
2339 goto setup_error;
2340 }
2341 }
2342 /* Set return code */
2343 ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret;
2344 setup_error:
2345 if (cmd_ctx->session) {
2346 session_unlock(cmd_ctx->session);
2347 session_put(cmd_ctx->session);
2348 cmd_ctx->session = NULL;
2349 }
2350 if (need_tracing_session) {
2351 session_unlock_list();
2352 }
2353 init_setup_error:
2354 assert(!rcu_read_ongoing());
2355 return ret;
2356 }
2357
2358 static int create_client_sock(void)
2359 {
2360 int ret, client_sock;
2361 const mode_t old_umask = umask(0);
2362
2363 /* Create client tool unix socket */
2364 client_sock = lttcomm_create_unix_sock(
2365 the_config.client_unix_sock_path.value);
2366 if (client_sock < 0) {
2367 ERR("Create unix sock failed: %s",
2368 the_config.client_unix_sock_path.value);
2369 ret = -1;
2370 goto end;
2371 }
2372
2373 /* Set the cloexec flag */
2374 ret = utils_set_fd_cloexec(client_sock);
2375 if (ret < 0) {
2376 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2377 "Continuing but note that the consumer daemon will have a "
2378 "reference to this socket on exec()", client_sock);
2379 }
2380
2381 /* File permission MUST be 660 */
2382 ret = chmod(the_config.client_unix_sock_path.value,
2383 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2384 if (ret < 0) {
2385 ERR("Set file permissions failed: %s",
2386 the_config.client_unix_sock_path.value);
2387 PERROR("chmod");
2388 (void) lttcomm_close_unix_sock(client_sock);
2389 ret = -1;
2390 goto end;
2391 }
2392 DBG("Created client socket (fd = %i)", client_sock);
2393 ret = client_sock;
2394 end:
2395 umask(old_umask);
2396 return ret;
2397 }
2398
2399 static void cleanup_client_thread(void *data)
2400 {
2401 struct lttng_pipe *quit_pipe = data;
2402
2403 lttng_pipe_destroy(quit_pipe);
2404 }
2405
2406 static void thread_init_cleanup(void *data)
2407 {
2408 set_thread_status(false);
2409 }
2410
2411 /*
2412 * This thread manage all clients request using the unix client socket for
2413 * communication.
2414 */
2415 static void *thread_manage_clients(void *data)
2416 {
2417 int sock = -1, ret, i, pollfd, err = -1;
2418 int sock_error;
2419 uint32_t revents, nb_fd;
2420 struct lttng_poll_event events;
2421 const int client_sock = thread_state.client_sock;
2422 struct lttng_pipe *quit_pipe = data;
2423 const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe);
2424 struct command_ctx cmd_ctx = {};
2425
2426 DBG("[thread] Manage client started");
2427
2428 lttng_payload_init(&cmd_ctx.reply_payload);
2429
2430 is_root = (getuid() == 0);
2431
2432 pthread_cleanup_push(thread_init_cleanup, NULL);
2433
2434 rcu_register_thread();
2435
2436 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
2437
2438 health_code_update();
2439
2440 ret = lttcomm_listen_unix_sock(client_sock);
2441 if (ret < 0) {
2442 goto error_listen;
2443 }
2444
2445 /*
2446 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2447 * more will be added to this poll set.
2448 */
2449 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2450 if (ret < 0) {
2451 goto error_create_poll;
2452 }
2453
2454 /* Add the application registration socket */
2455 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2456 if (ret < 0) {
2457 goto error;
2458 }
2459
2460 /* Add thread quit pipe */
2461 ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR);
2462 if (ret < 0) {
2463 goto error;
2464 }
2465
2466 /* Set state as running. */
2467 set_thread_status(true);
2468 pthread_cleanup_pop(0);
2469
2470 /* This testpoint is after we signal readiness to the parent. */
2471 if (testpoint(sessiond_thread_manage_clients)) {
2472 goto error;
2473 }
2474
2475 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
2476 goto error;
2477 }
2478
2479 health_code_update();
2480
2481 while (1) {
2482 const struct cmd_completion_handler *cmd_completion_handler;
2483
2484 cmd_ctx.creds = (lttng_sock_cred) {
2485 .uid = UINT32_MAX,
2486 .gid = UINT32_MAX,
2487 };
2488 cmd_ctx.session = NULL;
2489 lttng_payload_clear(&cmd_ctx.reply_payload);
2490 cmd_ctx.lttng_msg_size = 0;
2491
2492 DBG("Accepting client command ...");
2493
2494 /* Inifinite blocking call, waiting for transmission */
2495 restart:
2496 health_poll_entry();
2497 ret = lttng_poll_wait(&events, -1);
2498 health_poll_exit();
2499 if (ret < 0) {
2500 /*
2501 * Restart interrupted system call.
2502 */
2503 if (errno == EINTR) {
2504 goto restart;
2505 }
2506 goto error;
2507 }
2508
2509 nb_fd = ret;
2510
2511 for (i = 0; i < nb_fd; i++) {
2512 revents = LTTNG_POLL_GETEV(&events, i);
2513 pollfd = LTTNG_POLL_GETFD(&events, i);
2514
2515 health_code_update();
2516
2517 if (pollfd == thread_quit_pipe_fd) {
2518 err = 0;
2519 goto exit;
2520 } else {
2521 /* Event on the registration socket */
2522 if (revents & LPOLLIN) {
2523 continue;
2524 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2525 ERR("Client socket poll error");
2526 goto error;
2527 } else {
2528 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2529 goto error;
2530 }
2531 }
2532 }
2533
2534 DBG("Wait for client response");
2535
2536 health_code_update();
2537
2538 sock = lttcomm_accept_unix_sock(client_sock);
2539 if (sock < 0) {
2540 goto error;
2541 }
2542
2543 /*
2544 * Set the CLOEXEC flag. Return code is useless because either way, the
2545 * show must go on.
2546 */
2547 (void) utils_set_fd_cloexec(sock);
2548
2549 /* Set socket option for credentials retrieval */
2550 ret = lttcomm_setsockopt_creds_unix_sock(sock);
2551 if (ret < 0) {
2552 goto error;
2553 }
2554
2555 health_code_update();
2556
2557 /*
2558 * Data is received from the lttng client. The struct
2559 * lttcomm_session_msg (lsm) contains the command and data request of
2560 * the client.
2561 */
2562 DBG("Receiving data from client ...");
2563 ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm,
2564 sizeof(struct lttcomm_session_msg), &cmd_ctx.creds);
2565 if (ret != sizeof(struct lttcomm_session_msg)) {
2566 DBG("Incomplete recv() from client... continuing");
2567 ret = close(sock);
2568 if (ret) {
2569 PERROR("close");
2570 }
2571 sock = -1;
2572 continue;
2573 }
2574
2575 health_code_update();
2576
2577 // TODO: Validate cmd_ctx including sanity check for
2578 // security purpose.
2579
2580 rcu_thread_online();
2581 /*
2582 * This function dispatch the work to the kernel or userspace tracer
2583 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2584 * informations for the client. The command context struct contains
2585 * everything this function may needs.
2586 */
2587 ret = process_client_msg(&cmd_ctx, &sock, &sock_error);
2588 rcu_thread_offline();
2589 if (ret < 0) {
2590 if (sock >= 0) {
2591 ret = close(sock);
2592 if (ret) {
2593 PERROR("close");
2594 }
2595 }
2596 sock = -1;
2597 /*
2598 * TODO: Inform client somehow of the fatal error. At
2599 * this point, ret < 0 means that a zmalloc failed
2600 * (ENOMEM). Error detected but still accept
2601 * command, unless a socket error has been
2602 * detected.
2603 */
2604 continue;
2605 }
2606
2607 if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) {
2608 WARN("Command returned an invalid status code, returning unknown error: "
2609 "command type = %s (%d), ret = %d",
2610 lttcomm_sessiond_command_str(cmd_ctx.lsm.cmd_type),
2611 cmd_ctx.lsm.cmd_type, ret);
2612 ret = LTTNG_ERR_UNK;
2613 }
2614
2615 cmd_completion_handler = cmd_pop_completion_handler();
2616 if (cmd_completion_handler) {
2617 enum lttng_error_code completion_code;
2618
2619 completion_code = cmd_completion_handler->run(
2620 cmd_completion_handler->data);
2621 if (completion_code != LTTNG_OK) {
2622 continue;
2623 }
2624 }
2625
2626 health_code_update();
2627
2628 if (sock >= 0) {
2629 struct lttng_payload_view view =
2630 lttng_payload_view_from_payload(
2631 &cmd_ctx.reply_payload,
2632 0, -1);
2633 struct lttcomm_lttng_msg *llm = (typeof(
2634 llm)) cmd_ctx.reply_payload.buffer.data;
2635
2636 assert(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm));
2637 assert(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size);
2638
2639 llm->fd_count = lttng_payload_view_get_fd_handle_count(&view);
2640
2641 DBG("Sending response (size: %d, retcode: %s (%d))",
2642 cmd_ctx.lttng_msg_size,
2643 lttng_strerror(-llm->ret_code),
2644 llm->ret_code);
2645 ret = send_unix_sock(sock, &view);
2646 if (ret < 0) {
2647 ERR("Failed to send data back to client");
2648 }
2649
2650 /* End of transmission */
2651 ret = close(sock);
2652 if (ret) {
2653 PERROR("close");
2654 }
2655 }
2656 sock = -1;
2657
2658 health_code_update();
2659 }
2660
2661 exit:
2662 error:
2663 if (sock >= 0) {
2664 ret = close(sock);
2665 if (ret) {
2666 PERROR("close");
2667 }
2668 }
2669
2670 lttng_poll_clean(&events);
2671
2672 error_listen:
2673 error_create_poll:
2674 unlink(the_config.client_unix_sock_path.value);
2675 ret = close(client_sock);
2676 if (ret) {
2677 PERROR("close");
2678 }
2679
2680 if (err) {
2681 health_error();
2682 ERR("Health error occurred in %s", __func__);
2683 }
2684
2685 health_unregister(the_health_sessiond);
2686
2687 DBG("Client thread dying");
2688 lttng_payload_reset(&cmd_ctx.reply_payload);
2689 rcu_unregister_thread();
2690 return NULL;
2691 }
2692
2693 static
2694 bool shutdown_client_thread(void *thread_data)
2695 {
2696 struct lttng_pipe *client_quit_pipe = thread_data;
2697 const int write_fd = lttng_pipe_get_writefd(client_quit_pipe);
2698
2699 return notify_thread_pipe(write_fd) == 1;
2700 }
2701
2702 struct lttng_thread *launch_client_thread(void)
2703 {
2704 bool thread_running;
2705 struct lttng_pipe *client_quit_pipe;
2706 struct lttng_thread *thread = NULL;
2707 int client_sock_fd = -1;
2708
2709 sem_init(&thread_state.ready, 0, 0);
2710 client_quit_pipe = lttng_pipe_open(FD_CLOEXEC);
2711 if (!client_quit_pipe) {
2712 goto error;
2713 }
2714
2715 client_sock_fd = create_client_sock();
2716 if (client_sock_fd < 0) {
2717 goto error;
2718 }
2719
2720 thread_state.client_sock = client_sock_fd;
2721 thread = lttng_thread_create("Client management",
2722 thread_manage_clients,
2723 shutdown_client_thread,
2724 cleanup_client_thread,
2725 client_quit_pipe);
2726 if (!thread) {
2727 goto error;
2728 }
2729 /* The client thread now owns the client sock fd and the quit pipe. */
2730 client_sock_fd = -1;
2731 client_quit_pipe = NULL;
2732
2733 /*
2734 * This thread is part of the threads that need to be fully
2735 * initialized before the session daemon is marked as "ready".
2736 */
2737 thread_running = wait_thread_status();
2738 if (!thread_running) {
2739 goto error;
2740 }
2741 return thread;
2742 error:
2743 if (client_sock_fd >= 0) {
2744 if (close(client_sock_fd)) {
2745 PERROR("Failed to close client socket");
2746 }
2747 }
2748 lttng_thread_put(thread);
2749 cleanup_client_thread(client_quit_pipe);
2750 return NULL;
2751 }
LTTng 2.0 tools and control repository
This page took 0.137779 seconds and 3 git commands to generate.