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Fix: remove debugging output
[lttng-tools.git] / src / bin / lttng-sessiond / client.cpp
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 lttcomm_lttng_msg llm {};
91
92 llm.cmd_type = cmd_ctx->lsm.cmd_type;
93 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
94 llm.cmd_header_size = (uint32_t) cmd_header_len;
95 llm.data_size = (uint32_t) payload_len;
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 struct lttcomm_lttng_msg *p_llm;
165 lttcomm_lttng_msg llm {};
166
167 llm.cmd_type = cmd_ctx->lsm.cmd_type;
168 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
169 llm.cmd_header_size = (uint32_t) cmd_header_len;
170 llm.data_size = (uint32_t) payload_len;
171
172 LTTNG_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 = (char *) 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 = (char *) 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 static int copy_session_consumer(int domain, struct ltt_session *session)
422 {
423 int ret;
424 const char *dir_name;
425 struct consumer_output *consumer;
426
427 LTTNG_ASSERT(session);
428 LTTNG_ASSERT(session->consumer);
429
430 switch (domain) {
431 case LTTNG_DOMAIN_KERNEL:
432 DBG3("Copying tracing session consumer output in kernel session");
433 /*
434 * XXX: We should audit the session creation and what this function
435 * does "extra" in order to avoid a destroy since this function is used
436 * in the domain session creation (kernel and ust) only. Same for UST
437 * domain.
438 */
439 if (session->kernel_session->consumer) {
440 consumer_output_put(session->kernel_session->consumer);
441 }
442 session->kernel_session->consumer =
443 consumer_copy_output(session->consumer);
444 /* Ease our life a bit for the next part */
445 consumer = session->kernel_session->consumer;
446 dir_name = DEFAULT_KERNEL_TRACE_DIR;
447 break;
448 case LTTNG_DOMAIN_JUL:
449 case LTTNG_DOMAIN_LOG4J:
450 case LTTNG_DOMAIN_PYTHON:
451 case LTTNG_DOMAIN_UST:
452 DBG3("Copying tracing session consumer output in UST session");
453 if (session->ust_session->consumer) {
454 consumer_output_put(session->ust_session->consumer);
455 }
456 session->ust_session->consumer =
457 consumer_copy_output(session->consumer);
458 /* Ease our life a bit for the next part */
459 consumer = session->ust_session->consumer;
460 dir_name = DEFAULT_UST_TRACE_DIR;
461 break;
462 default:
463 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
464 goto error;
465 }
466
467 /* Append correct directory to subdir */
468 ret = lttng_strncpy(consumer->domain_subdir, dir_name,
469 sizeof(consumer->domain_subdir));
470 if (ret) {
471 ret = LTTNG_ERR_UNK;
472 goto error;
473 }
474 DBG3("Copy session consumer subdir %s", consumer->domain_subdir);
475 ret = LTTNG_OK;
476
477 error:
478 return ret;
479 }
480
481 /*
482 * Create an UST session and add it to the session ust list.
483 */
484 static int create_ust_session(struct ltt_session *session,
485 const struct lttng_domain *domain)
486 {
487 int ret;
488 struct ltt_ust_session *lus = NULL;
489
490 LTTNG_ASSERT(session);
491 LTTNG_ASSERT(domain);
492 LTTNG_ASSERT(session->consumer);
493
494 switch (domain->type) {
495 case LTTNG_DOMAIN_JUL:
496 case LTTNG_DOMAIN_LOG4J:
497 case LTTNG_DOMAIN_PYTHON:
498 case LTTNG_DOMAIN_UST:
499 break;
500 default:
501 ERR("Unknown UST domain on create session %d", domain->type);
502 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
503 goto error;
504 }
505
506 DBG("Creating UST session");
507
508 lus = trace_ust_create_session(session->id);
509 if (lus == NULL) {
510 ret = LTTNG_ERR_UST_SESS_FAIL;
511 goto error;
512 }
513
514 lus->uid = session->uid;
515 lus->gid = session->gid;
516 lus->output_traces = session->output_traces;
517 lus->snapshot_mode = session->snapshot_mode;
518 lus->live_timer_interval = session->live_timer;
519 session->ust_session = lus;
520 if (session->shm_path[0]) {
521 strncpy(lus->root_shm_path, session->shm_path,
522 sizeof(lus->root_shm_path));
523 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
524 strncpy(lus->shm_path, session->shm_path,
525 sizeof(lus->shm_path));
526 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
527 strncat(lus->shm_path, "/ust",
528 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
529 }
530 /* Copy session output to the newly created UST session */
531 ret = copy_session_consumer(domain->type, session);
532 if (ret != LTTNG_OK) {
533 goto error;
534 }
535
536 return LTTNG_OK;
537
538 error:
539 free(lus);
540 session->ust_session = NULL;
541 return ret;
542 }
543
544 /*
545 * Create a kernel tracer session then create the default channel.
546 */
547 static int create_kernel_session(struct ltt_session *session)
548 {
549 int ret;
550
551 DBG("Creating kernel session");
552
553 ret = kernel_create_session(session);
554 if (ret < 0) {
555 ret = LTTNG_ERR_KERN_SESS_FAIL;
556 goto error_create;
557 }
558
559 /* Code flow safety */
560 LTTNG_ASSERT(session->kernel_session);
561
562 /* Copy session output to the newly created Kernel session */
563 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
564 if (ret != LTTNG_OK) {
565 goto error;
566 }
567
568 session->kernel_session->uid = session->uid;
569 session->kernel_session->gid = session->gid;
570 session->kernel_session->output_traces = session->output_traces;
571 session->kernel_session->snapshot_mode = session->snapshot_mode;
572 session->kernel_session->is_live_session = session->live_timer != 0;
573
574 return LTTNG_OK;
575
576 error:
577 trace_kernel_destroy_session(session->kernel_session);
578 session->kernel_session = NULL;
579 error_create:
580 return ret;
581 }
582
583 /*
584 * Count number of session permitted by uid/gid.
585 */
586 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
587 {
588 unsigned int i = 0;
589 struct ltt_session *session;
590 const struct ltt_session_list *session_list = session_get_list();
591
592 DBG("Counting number of available session for UID %d", uid);
593 cds_list_for_each_entry(session, &session_list->head, list) {
594 if (!session_get(session)) {
595 continue;
596 }
597 session_lock(session);
598 /* Only count the sessions the user can control. */
599 if (session_access_ok(session, uid) &&
600 !session->destroyed) {
601 i++;
602 }
603 session_unlock(session);
604 session_put(session);
605 }
606 return i;
607 }
608
609 static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx,
610 int sock,
611 int *sock_error,
612 struct lttng_trigger **_trigger)
613 {
614 int ret;
615 size_t trigger_len;
616 ssize_t sock_recv_len;
617 enum lttng_error_code ret_code;
618 struct lttng_payload trigger_payload;
619 struct lttng_trigger *trigger = NULL;
620
621 lttng_payload_init(&trigger_payload);
622 trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
623 ret = lttng_dynamic_buffer_set_size(
624 &trigger_payload.buffer, trigger_len);
625 if (ret) {
626 ret_code = LTTNG_ERR_NOMEM;
627 goto end;
628 }
629
630 sock_recv_len = lttcomm_recv_unix_sock(
631 sock, trigger_payload.buffer.data, trigger_len);
632 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
633 ERR("Failed to receive trigger in command payload");
634 *sock_error = 1;
635 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
636 goto end;
637 }
638
639 /* Receive fds, if any. */
640 if (cmd_ctx->lsm.fd_count > 0) {
641 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
642 sock, cmd_ctx->lsm.fd_count, &trigger_payload);
643 if (sock_recv_len > 0 &&
644 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
645 ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
646 cmd_ctx->lsm.fd_count, (int) ret);
647 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
648 *sock_error = 1;
649 goto end;
650 } else if (sock_recv_len <= 0) {
651 ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
652 cmd_ctx->lsm.fd_count, (int) ret);
653 ret_code = LTTNG_ERR_FATAL;
654 *sock_error = 1;
655 goto end;
656 }
657 }
658
659 /* Deserialize trigger. */
660 {
661 struct lttng_payload_view view =
662 lttng_payload_view_from_payload(
663 &trigger_payload, 0, -1);
664
665 if (lttng_trigger_create_from_payload(&view, &trigger) !=
666 trigger_len) {
667 ERR("Invalid trigger received as part of command payload");
668 ret_code = LTTNG_ERR_INVALID_TRIGGER;
669 lttng_trigger_put(trigger);
670 goto end;
671 }
672 }
673
674 *_trigger = trigger;
675 ret_code = LTTNG_OK;
676
677 end:
678 lttng_payload_reset(&trigger_payload);
679 return ret_code;
680 }
681
682 static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx,
683 int sock,
684 int *sock_error,
685 struct lttng_error_query **_query)
686 {
687 int ret;
688 size_t query_len;
689 ssize_t sock_recv_len;
690 enum lttng_error_code ret_code;
691 struct lttng_payload query_payload;
692 struct lttng_error_query *query = NULL;
693
694 lttng_payload_init(&query_payload);
695 query_len = (size_t) cmd_ctx->lsm.u.error_query.length;
696 ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len);
697 if (ret) {
698 ret_code = LTTNG_ERR_NOMEM;
699 goto end;
700 }
701
702 sock_recv_len = lttcomm_recv_unix_sock(
703 sock, query_payload.buffer.data, query_len);
704 if (sock_recv_len < 0 || sock_recv_len != query_len) {
705 ERR("Failed to receive error query in command payload");
706 *sock_error = 1;
707 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
708 goto end;
709 }
710
711 /* Receive fds, if any. */
712 if (cmd_ctx->lsm.fd_count > 0) {
713 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
714 sock, cmd_ctx->lsm.fd_count, &query_payload);
715 if (sock_recv_len > 0 &&
716 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
717 ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d",
718 cmd_ctx->lsm.fd_count, (int) ret);
719 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
720 *sock_error = 1;
721 goto end;
722 } else if (sock_recv_len <= 0) {
723 ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d",
724 cmd_ctx->lsm.fd_count, (int) ret);
725 ret_code = LTTNG_ERR_FATAL;
726 *sock_error = 1;
727 goto end;
728 }
729 }
730
731 /* Deserialize error query. */
732 {
733 struct lttng_payload_view view =
734 lttng_payload_view_from_payload(
735 &query_payload, 0, -1);
736
737 if (lttng_error_query_create_from_payload(&view, &query) !=
738 query_len) {
739 ERR("Invalid error query received as part of command payload");
740 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
741 goto end;
742 }
743 }
744
745 *_query = query;
746 ret_code = LTTNG_OK;
747
748 end:
749 lttng_payload_reset(&query_payload);
750 return ret_code;
751 }
752
753 static enum lttng_error_code receive_lttng_event(struct command_ctx *cmd_ctx,
754 int sock,
755 int *sock_error,
756 struct lttng_event **out_event,
757 char **out_filter_expression,
758 struct lttng_bytecode **out_bytecode,
759 struct lttng_event_exclusion **out_exclusion)
760 {
761 int ret;
762 size_t event_len;
763 ssize_t sock_recv_len;
764 enum lttng_error_code ret_code;
765 struct lttng_payload event_payload;
766
767 lttng_payload_init(&event_payload);
768 if (cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT) {
769 event_len = (size_t) cmd_ctx->lsm.u.enable.length;
770 } else if (cmd_ctx->lsm.cmd_type == LTTNG_DISABLE_EVENT) {
771 event_len = (size_t) cmd_ctx->lsm.u.disable.length;
772 } else {
773 abort();
774 }
775
776 ret = lttng_dynamic_buffer_set_size(&event_payload.buffer, event_len);
777 if (ret) {
778 ret_code = LTTNG_ERR_NOMEM;
779 goto end;
780 }
781
782 sock_recv_len = lttcomm_recv_unix_sock(
783 sock, event_payload.buffer.data, event_len);
784 if (sock_recv_len < 0 || sock_recv_len != event_len) {
785 ERR("Failed to receive event in command payload");
786 *sock_error = 1;
787 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
788 goto end;
789 }
790
791 /* Receive fds, if any. */
792 if (cmd_ctx->lsm.fd_count > 0) {
793 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
794 sock, cmd_ctx->lsm.fd_count, &event_payload);
795 if (sock_recv_len > 0 &&
796 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
797 ERR("Failed to receive all file descriptors for event in command payload: expected fd count = %u, ret = %d",
798 cmd_ctx->lsm.fd_count, (int) ret);
799 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
800 *sock_error = 1;
801 goto end;
802 } else if (sock_recv_len <= 0) {
803 ERR("Failed to receive file descriptors for event in command payload: expected fd count = %u, ret = %d",
804 cmd_ctx->lsm.fd_count, (int) ret);
805 ret_code = LTTNG_ERR_FATAL;
806 *sock_error = 1;
807 goto end;
808 }
809 }
810
811 /* Deserialize event. */
812 {
813 struct lttng_payload_view event_view =
814 lttng_payload_view_from_payload(
815 &event_payload, 0, -1);
816
817 if (lttng_event_create_from_payload(&event_view, out_event,
818 out_exclusion, out_filter_expression,
819 out_bytecode) != event_len) {
820 ERR("Invalid event received as part of command payload");
821 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
822 goto end;
823 }
824 }
825
826 ret_code = LTTNG_OK;
827
828 end:
829 lttng_payload_reset(&event_payload);
830 return ret_code;
831 }
832
833 static enum lttng_error_code receive_lttng_event_context(
834 const struct command_ctx *cmd_ctx,
835 int sock,
836 int *sock_error,
837 struct lttng_event_context **out_event_context)
838 {
839 int ret;
840 const size_t event_context_len =
841 (size_t) cmd_ctx->lsm.u.context.length;
842 ssize_t sock_recv_len;
843 enum lttng_error_code ret_code;
844 struct lttng_payload event_context_payload;
845
846 lttng_payload_init(&event_context_payload);
847
848 ret = lttng_dynamic_buffer_set_size(&event_context_payload.buffer,
849 event_context_len);
850 if (ret) {
851 ret_code = LTTNG_ERR_NOMEM;
852 goto end;
853 }
854
855 sock_recv_len = lttcomm_recv_unix_sock(
856 sock, event_context_payload.buffer.data,
857 event_context_len);
858 if (sock_recv_len < 0 || sock_recv_len != event_context_len) {
859 ERR("Failed to receive event context in command payload");
860 *sock_error = 1;
861 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
862 goto end;
863 }
864
865 /* Deserialize event. */
866 {
867 struct lttng_payload_view event_context_view =
868 lttng_payload_view_from_payload(
869 &event_context_payload, 0, -1);
870
871 if (lttng_event_context_create_from_payload(
872 &event_context_view, out_event_context) !=
873 event_context_len) {
874 ERR("Invalid event context received as part of command payload");
875 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
876 goto end;
877 }
878 }
879
880 ret_code = LTTNG_OK;
881
882 end:
883 lttng_payload_reset(&event_context_payload);
884 return ret_code;
885 }
886
887 /*
888 * Version of setup_lttng_msg() without command header.
889 */
890 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
891 void *payload_buf, size_t payload_len)
892 {
893 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
894 }
895
896 /*
897 * Check if the current kernel tracer supports the session rotation feature.
898 * Return 1 if it does, 0 otherwise.
899 */
900 static int check_rotate_compatible(void)
901 {
902 int ret = 1;
903
904 if (the_kernel_tracer_version.major != 2 ||
905 the_kernel_tracer_version.minor < 11) {
906 DBG("Kernel tracer version is not compatible with the rotation feature");
907 ret = 0;
908 }
909
910 return ret;
911 }
912
913 /*
914 * Send data on a unix socket using the liblttsessiondcomm API.
915 *
916 * Return lttcomm error code.
917 */
918 static int send_unix_sock(int sock, struct lttng_payload_view *view)
919 {
920 int ret;
921 const int fd_count = lttng_payload_view_get_fd_handle_count(view);
922
923 /* Check valid length */
924 if (view->buffer.size == 0) {
925 ret = -1;
926 goto end;
927 }
928
929 ret = lttcomm_send_unix_sock(
930 sock, view->buffer.data, view->buffer.size);
931 if (ret < 0) {
932 goto end;
933 }
934
935 if (fd_count > 0) {
936 ret = lttcomm_send_payload_view_fds_unix_sock(sock, view);
937 if (ret < 0) {
938 goto end;
939 }
940 }
941
942 end:
943 return ret;
944 }
945
946 /*
947 * Process the command requested by the lttng client within the command
948 * context structure. This function make sure that the return structure (llm)
949 * is set and ready for transmission before returning.
950 *
951 * Return any error encountered or 0 for success.
952 *
953 * "sock" is only used for special-case var. len data.
954 * A command may assume the ownership of the socket, in which case its value
955 * should be set to -1.
956 */
957 static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
958 int *sock_error)
959 {
960 int ret = LTTNG_OK;
961 bool need_tracing_session = true;
962 bool need_domain;
963 bool need_consumerd;
964
965 DBG("Processing client command '%s\' (%d)",
966 lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx->lsm.cmd_type),
967 cmd_ctx->lsm.cmd_type);
968
969 *sock_error = 0;
970
971 switch (cmd_ctx->lsm.cmd_type) {
972 case LTTNG_CREATE_SESSION_EXT:
973 case LTTNG_DESTROY_SESSION:
974 case LTTNG_LIST_SESSIONS:
975 case LTTNG_LIST_DOMAINS:
976 case LTTNG_START_TRACE:
977 case LTTNG_STOP_TRACE:
978 case LTTNG_DATA_PENDING:
979 case LTTNG_SNAPSHOT_ADD_OUTPUT:
980 case LTTNG_SNAPSHOT_DEL_OUTPUT:
981 case LTTNG_SNAPSHOT_LIST_OUTPUT:
982 case LTTNG_SNAPSHOT_RECORD:
983 case LTTNG_SAVE_SESSION:
984 case LTTNG_SET_SESSION_SHM_PATH:
985 case LTTNG_REGENERATE_METADATA:
986 case LTTNG_REGENERATE_STATEDUMP:
987 case LTTNG_ROTATE_SESSION:
988 case LTTNG_ROTATION_GET_INFO:
989 case LTTNG_ROTATION_SET_SCHEDULE:
990 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
991 case LTTNG_CLEAR_SESSION:
992 case LTTNG_LIST_TRIGGERS:
993 case LTTNG_EXECUTE_ERROR_QUERY:
994 need_domain = false;
995 break;
996 default:
997 need_domain = true;
998 }
999
1000 /* Needs a functioning consumerd? */
1001 switch (cmd_ctx->lsm.cmd_type) {
1002 case LTTNG_REGISTER_TRIGGER:
1003 case LTTNG_UNREGISTER_TRIGGER:
1004 case LTTNG_EXECUTE_ERROR_QUERY:
1005 need_consumerd = false;
1006 break;
1007 default:
1008 need_consumerd = true;
1009 break;
1010 }
1011
1012 if (the_config.no_kernel && need_domain &&
1013 cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) {
1014 if (!is_root) {
1015 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1016 } else {
1017 ret = LTTNG_ERR_KERN_NA;
1018 }
1019 goto error;
1020 }
1021
1022 /* Deny register consumer if we already have a spawned consumer. */
1023 if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) {
1024 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1025 if (the_kconsumer_data.pid > 0) {
1026 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1027 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1028 goto error;
1029 }
1030 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1031 }
1032
1033 /*
1034 * Check for command that don't needs to allocate a returned payload. We do
1035 * this here so we don't have to make the call for no payload at each
1036 * command.
1037 */
1038 switch(cmd_ctx->lsm.cmd_type) {
1039 case LTTNG_LIST_SESSIONS:
1040 case LTTNG_LIST_TRACEPOINTS:
1041 case LTTNG_LIST_TRACEPOINT_FIELDS:
1042 case LTTNG_LIST_DOMAINS:
1043 case LTTNG_LIST_CHANNELS:
1044 case LTTNG_LIST_EVENTS:
1045 case LTTNG_LIST_SYSCALLS:
1046 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1047 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1048 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1049 case LTTNG_DATA_PENDING:
1050 case LTTNG_ROTATE_SESSION:
1051 case LTTNG_ROTATION_GET_INFO:
1052 case LTTNG_REGISTER_TRIGGER:
1053 case LTTNG_LIST_TRIGGERS:
1054 case LTTNG_EXECUTE_ERROR_QUERY:
1055 break;
1056 default:
1057 /* Setup lttng message with no payload */
1058 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
1059 if (ret < 0) {
1060 /* This label does not try to unlock the session */
1061 goto init_setup_error;
1062 }
1063 }
1064
1065 /* Commands that DO NOT need a session. */
1066 switch (cmd_ctx->lsm.cmd_type) {
1067 case LTTNG_CREATE_SESSION_EXT:
1068 case LTTNG_LIST_SESSIONS:
1069 case LTTNG_LIST_TRACEPOINTS:
1070 case LTTNG_LIST_SYSCALLS:
1071 case LTTNG_LIST_TRACEPOINT_FIELDS:
1072 case LTTNG_SAVE_SESSION:
1073 case LTTNG_REGISTER_TRIGGER:
1074 case LTTNG_UNREGISTER_TRIGGER:
1075 case LTTNG_LIST_TRIGGERS:
1076 case LTTNG_EXECUTE_ERROR_QUERY:
1077 need_tracing_session = false;
1078 break;
1079 default:
1080 DBG("Getting session %s by name", cmd_ctx->lsm.session.name);
1081 /*
1082 * We keep the session list lock across _all_ commands
1083 * for now, because the per-session lock does not
1084 * handle teardown properly.
1085 */
1086 session_lock_list();
1087 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name);
1088 if (cmd_ctx->session == NULL) {
1089 ret = LTTNG_ERR_SESS_NOT_FOUND;
1090 goto error;
1091 } else {
1092 /* Acquire lock for the session */
1093 session_lock(cmd_ctx->session);
1094 }
1095 break;
1096 }
1097
1098 /*
1099 * Commands that need a valid session but should NOT create one if none
1100 * exists. Instead of creating one and destroying it when the command is
1101 * handled, process that right before so we save some round trip in useless
1102 * code path.
1103 */
1104 switch (cmd_ctx->lsm.cmd_type) {
1105 case LTTNG_DISABLE_CHANNEL:
1106 case LTTNG_DISABLE_EVENT:
1107 switch (cmd_ctx->lsm.domain.type) {
1108 case LTTNG_DOMAIN_KERNEL:
1109 if (!cmd_ctx->session->kernel_session) {
1110 ret = LTTNG_ERR_NO_CHANNEL;
1111 goto error;
1112 }
1113 break;
1114 case LTTNG_DOMAIN_JUL:
1115 case LTTNG_DOMAIN_LOG4J:
1116 case LTTNG_DOMAIN_PYTHON:
1117 case LTTNG_DOMAIN_UST:
1118 if (!cmd_ctx->session->ust_session) {
1119 ret = LTTNG_ERR_NO_CHANNEL;
1120 goto error;
1121 }
1122 break;
1123 default:
1124 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1125 goto error;
1126 }
1127 default:
1128 break;
1129 }
1130
1131 if (!need_domain) {
1132 goto skip_domain;
1133 }
1134
1135 /*
1136 * Check domain type for specific "pre-action".
1137 */
1138 switch (cmd_ctx->lsm.domain.type) {
1139 case LTTNG_DOMAIN_KERNEL:
1140 if (!is_root) {
1141 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1142 goto error;
1143 }
1144
1145 /* Kernel tracer check */
1146 if (!kernel_tracer_is_initialized()) {
1147 /* Basically, load kernel tracer modules */
1148 ret = init_kernel_tracer();
1149 if (ret != 0) {
1150 goto error;
1151 }
1152 }
1153
1154 /* Consumer is in an ERROR state. Report back to client */
1155 if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) ==
1156 CONSUMER_ERROR) {
1157 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1158 goto error;
1159 }
1160
1161 /* Need a session for kernel command */
1162 if (need_tracing_session) {
1163 if (cmd_ctx->session->kernel_session == NULL) {
1164 ret = create_kernel_session(cmd_ctx->session);
1165 if (ret != LTTNG_OK) {
1166 ret = LTTNG_ERR_KERN_SESS_FAIL;
1167 goto error;
1168 }
1169 }
1170
1171 /* Start the kernel consumer daemon */
1172 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1173 if (the_kconsumer_data.pid == 0 &&
1174 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1175 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1176 ret = start_consumerd(&the_kconsumer_data);
1177 if (ret < 0) {
1178 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1179 goto error;
1180 }
1181 uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED);
1182 } else {
1183 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1184 }
1185
1186 /*
1187 * The consumer was just spawned so we need to add the socket to
1188 * the consumer output of the session if exist.
1189 */
1190 ret = consumer_create_socket(&the_kconsumer_data,
1191 cmd_ctx->session->kernel_session->consumer);
1192 if (ret < 0) {
1193 goto error;
1194 }
1195 }
1196
1197 break;
1198 case LTTNG_DOMAIN_JUL:
1199 case LTTNG_DOMAIN_LOG4J:
1200 case LTTNG_DOMAIN_PYTHON:
1201 if (!agent_tracing_is_enabled()) {
1202 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1203 goto error;
1204 }
1205 /* Fallthrough */
1206 case LTTNG_DOMAIN_UST:
1207 {
1208 if (!ust_app_supported()) {
1209 ret = LTTNG_ERR_NO_UST;
1210 goto error;
1211 }
1212
1213 /* Consumer is in an ERROR state. Report back to client */
1214 if (need_consumerd &&
1215 uatomic_read(&the_ust_consumerd_state) ==
1216 CONSUMER_ERROR) {
1217 ret = LTTNG_ERR_NO_USTCONSUMERD;
1218 goto error;
1219 }
1220
1221 if (need_tracing_session) {
1222 /* Create UST session if none exist. */
1223 if (cmd_ctx->session->ust_session == NULL) {
1224 lttng_domain domain = cmd_ctx->lsm.domain;
1225 ret = create_ust_session(cmd_ctx->session, &domain);
1226 if (ret != LTTNG_OK) {
1227 goto error;
1228 }
1229 }
1230
1231 /* Start the UST consumer daemons */
1232 /* 64-bit */
1233 pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex);
1234 if (the_config.consumerd64_bin_path.value &&
1235 the_ustconsumer64_data.pid == 0 &&
1236 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1237 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1238 ret = start_consumerd(&the_ustconsumer64_data);
1239 if (ret < 0) {
1240 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
1241 uatomic_set(&the_ust_consumerd64_fd, -EINVAL);
1242 goto error;
1243 }
1244
1245 uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock);
1246 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1247 } else {
1248 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1249 }
1250
1251 /*
1252 * Setup socket for consumer 64 bit. No need for atomic access
1253 * since it was set above and can ONLY be set in this thread.
1254 */
1255 ret = consumer_create_socket(&the_ustconsumer64_data,
1256 cmd_ctx->session->ust_session->consumer);
1257 if (ret < 0) {
1258 goto error;
1259 }
1260
1261 /* 32-bit */
1262 pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex);
1263 if (the_config.consumerd32_bin_path.value &&
1264 the_ustconsumer32_data.pid == 0 &&
1265 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1266 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1267 ret = start_consumerd(&the_ustconsumer32_data);
1268 if (ret < 0) {
1269 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
1270 uatomic_set(&the_ust_consumerd32_fd, -EINVAL);
1271 goto error;
1272 }
1273
1274 uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock);
1275 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1276 } else {
1277 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1278 }
1279
1280 /*
1281 * Setup socket for consumer 32 bit. No need for atomic access
1282 * since it was set above and can ONLY be set in this thread.
1283 */
1284 ret = consumer_create_socket(&the_ustconsumer32_data,
1285 cmd_ctx->session->ust_session->consumer);
1286 if (ret < 0) {
1287 goto error;
1288 }
1289 }
1290 break;
1291 }
1292 default:
1293 break;
1294 }
1295 skip_domain:
1296
1297 /* Validate consumer daemon state when start/stop trace command */
1298 if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE ||
1299 cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) {
1300 switch (cmd_ctx->lsm.domain.type) {
1301 case LTTNG_DOMAIN_NONE:
1302 break;
1303 case LTTNG_DOMAIN_JUL:
1304 case LTTNG_DOMAIN_LOG4J:
1305 case LTTNG_DOMAIN_PYTHON:
1306 case LTTNG_DOMAIN_UST:
1307 if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) {
1308 ret = LTTNG_ERR_NO_USTCONSUMERD;
1309 goto error;
1310 }
1311 break;
1312 case LTTNG_DOMAIN_KERNEL:
1313 if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) {
1314 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1315 goto error;
1316 }
1317 break;
1318 default:
1319 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1320 goto error;
1321 }
1322 }
1323
1324 /*
1325 * Check that the UID matches that of the tracing session.
1326 * The root user can interact with all sessions.
1327 */
1328 if (need_tracing_session) {
1329 if (!session_access_ok(cmd_ctx->session,
1330 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) ||
1331 cmd_ctx->session->destroyed) {
1332 ret = LTTNG_ERR_EPERM;
1333 goto error;
1334 }
1335 }
1336
1337 /*
1338 * Send relayd information to consumer as soon as we have a domain and a
1339 * session defined.
1340 */
1341 if (cmd_ctx->session && need_domain) {
1342 /*
1343 * Setup relayd if not done yet. If the relayd information was already
1344 * sent to the consumer, this call will gracefully return.
1345 */
1346 ret = cmd_setup_relayd(cmd_ctx->session);
1347 if (ret != LTTNG_OK) {
1348 goto error;
1349 }
1350 }
1351
1352 /* Process by command type */
1353 switch (cmd_ctx->lsm.cmd_type) {
1354 case LTTNG_ADD_CONTEXT:
1355 {
1356 struct lttng_event_context *event_context;
1357 const enum lttng_error_code ret_code =
1358 receive_lttng_event_context(
1359 cmd_ctx, *sock, sock_error, &event_context);
1360
1361 if (ret_code != LTTNG_OK) {
1362 ret = (int) ret_code;
1363 goto error;
1364 }
1365
1366 ret = cmd_add_context(cmd_ctx, event_context, the_kernel_poll_pipe[1]);
1367 lttng_event_context_destroy(event_context);
1368 break;
1369 }
1370 case LTTNG_DISABLE_CHANNEL:
1371 {
1372 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1373 cmd_ctx->lsm.u.disable.channel_name);
1374 break;
1375 }
1376 case LTTNG_ENABLE_CHANNEL:
1377 {
1378 ret = cmd_enable_channel(
1379 cmd_ctx, *sock, the_kernel_poll_pipe[1]);
1380 break;
1381 }
1382 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE:
1383 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE:
1384 {
1385 struct lttng_dynamic_buffer payload;
1386 struct lttng_buffer_view payload_view;
1387 const bool add_value =
1388 cmd_ctx->lsm.cmd_type ==
1389 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE;
1390 const size_t name_len =
1391 cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1392 .name_len;
1393 const enum lttng_domain_type domain_type =
1394 (enum lttng_domain_type)
1395 cmd_ctx->lsm.domain.type;
1396 const enum lttng_process_attr process_attr =
1397 (enum lttng_process_attr) cmd_ctx->lsm.u
1398 .process_attr_tracker_add_remove_include_value
1399 .process_attr;
1400 const enum lttng_process_attr_value_type value_type =
1401 (enum lttng_process_attr_value_type) cmd_ctx
1402 ->lsm.u
1403 .process_attr_tracker_add_remove_include_value
1404 .value_type;
1405 struct process_attr_value *value;
1406 enum lttng_error_code ret_code;
1407 long login_name_max;
1408
1409 login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
1410 if (login_name_max < 0) {
1411 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1412 ret = LTTNG_ERR_INVALID;
1413 goto error;
1414 }
1415
1416 /* Receive remaining variable length payload if applicable. */
1417 if (name_len > login_name_max) {
1418 /*
1419 * POSIX mandates user and group names that are at least
1420 * 8 characters long. Note that although shadow-utils
1421 * (useradd, groupaadd, etc.) use 32 chars as their
1422 * limit (from bits/utmp.h, UT_NAMESIZE),
1423 * LOGIN_NAME_MAX is defined to 256.
1424 */
1425 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1426 add_value ? "addition" : "removal",
1427 name_len, login_name_max);
1428 ret = LTTNG_ERR_INVALID;
1429 goto error;
1430 }
1431
1432 lttng_dynamic_buffer_init(&payload);
1433 if (name_len != 0) {
1434 /*
1435 * Receive variable payload for user/group name
1436 * arguments.
1437 */
1438 ret = lttng_dynamic_buffer_set_size(&payload, name_len);
1439 if (ret) {
1440 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1441 add_value ? "add" : "remove");
1442 ret = LTTNG_ERR_NOMEM;
1443 goto error_add_remove_tracker_value;
1444 }
1445
1446 ret = lttcomm_recv_unix_sock(
1447 *sock, payload.data, name_len);
1448 if (ret <= 0) {
1449 ERR("Failed to receive payload of %s process attribute tracker value argument",
1450 add_value ? "add" : "remove");
1451 *sock_error = 1;
1452 ret = LTTNG_ERR_INVALID_PROTOCOL;
1453 goto error_add_remove_tracker_value;
1454 }
1455 }
1456
1457 payload_view = lttng_buffer_view_from_dynamic_buffer(
1458 &payload, 0, name_len);
1459 if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) {
1460 ret = LTTNG_ERR_INVALID_PROTOCOL;
1461 goto error_add_remove_tracker_value;
1462 }
1463
1464 /*
1465 * Validate the value type and domains are legal for the process
1466 * attribute tracker that is specified and convert the value to
1467 * add/remove to the internal sessiond representation.
1468 */
1469 ret_code = process_attr_value_from_comm(domain_type,
1470 process_attr, value_type,
1471 &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1472 .integral_value,
1473 &payload_view, &value);
1474 if (ret_code != LTTNG_OK) {
1475 ret = ret_code;
1476 goto error_add_remove_tracker_value;
1477 }
1478
1479 if (add_value) {
1480 ret = cmd_process_attr_tracker_inclusion_set_add_value(
1481 cmd_ctx->session, domain_type,
1482 process_attr, value);
1483 } else {
1484 ret = cmd_process_attr_tracker_inclusion_set_remove_value(
1485 cmd_ctx->session, domain_type,
1486 process_attr, value);
1487 }
1488 process_attr_value_destroy(value);
1489 error_add_remove_tracker_value:
1490 lttng_dynamic_buffer_reset(&payload);
1491 break;
1492 }
1493 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1494 {
1495 enum lttng_tracking_policy tracking_policy;
1496 const enum lttng_domain_type domain_type =
1497 (enum lttng_domain_type)
1498 cmd_ctx->lsm.domain.type;
1499 const enum lttng_process_attr process_attr =
1500 (enum lttng_process_attr) cmd_ctx->lsm.u
1501 .process_attr_tracker_get_tracking_policy
1502 .process_attr;
1503
1504 ret = cmd_process_attr_tracker_get_tracking_policy(
1505 cmd_ctx->session, domain_type, process_attr,
1506 &tracking_policy);
1507 if (ret != LTTNG_OK) {
1508 goto error;
1509 }
1510
1511 uint32_t tracking_policy_u32 = tracking_policy;
1512 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1513 &tracking_policy_u32, sizeof(uint32_t));
1514 if (ret < 0) {
1515 ret = LTTNG_ERR_NOMEM;
1516 goto error;
1517 }
1518 ret = LTTNG_OK;
1519 break;
1520 }
1521 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY:
1522 {
1523 const enum lttng_tracking_policy tracking_policy =
1524 (enum lttng_tracking_policy) cmd_ctx->lsm.u
1525 .process_attr_tracker_set_tracking_policy
1526 .tracking_policy;
1527 const enum lttng_domain_type domain_type =
1528 (enum lttng_domain_type)
1529 cmd_ctx->lsm.domain.type;
1530 const enum lttng_process_attr process_attr =
1531 (enum lttng_process_attr) cmd_ctx->lsm.u
1532 .process_attr_tracker_set_tracking_policy
1533 .process_attr;
1534
1535 ret = cmd_process_attr_tracker_set_tracking_policy(
1536 cmd_ctx->session, domain_type, process_attr,
1537 tracking_policy);
1538 if (ret != LTTNG_OK) {
1539 goto error;
1540 }
1541 break;
1542 }
1543 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1544 {
1545 struct lttng_process_attr_values *values;
1546 struct lttng_dynamic_buffer reply;
1547 const enum lttng_domain_type domain_type =
1548 (enum lttng_domain_type)
1549 cmd_ctx->lsm.domain.type;
1550 const enum lttng_process_attr process_attr =
1551 (enum lttng_process_attr) cmd_ctx->lsm.u
1552 .process_attr_tracker_get_inclusion_set
1553 .process_attr;
1554
1555 ret = cmd_process_attr_tracker_get_inclusion_set(
1556 cmd_ctx->session, domain_type, process_attr,
1557 &values);
1558 if (ret != LTTNG_OK) {
1559 goto error;
1560 }
1561
1562 lttng_dynamic_buffer_init(&reply);
1563 ret = lttng_process_attr_values_serialize(values, &reply);
1564 if (ret < 0) {
1565 goto error_tracker_get_inclusion_set;
1566 }
1567
1568 ret = setup_lttng_msg_no_cmd_header(
1569 cmd_ctx, reply.data, reply.size);
1570 if (ret < 0) {
1571 ret = LTTNG_ERR_NOMEM;
1572 goto error_tracker_get_inclusion_set;
1573 }
1574 ret = LTTNG_OK;
1575
1576 error_tracker_get_inclusion_set:
1577 lttng_process_attr_values_destroy(values);
1578 lttng_dynamic_buffer_reset(&reply);
1579 break;
1580 }
1581 case LTTNG_ENABLE_EVENT:
1582 case LTTNG_DISABLE_EVENT:
1583 {
1584 struct lttng_event *event;
1585 char *filter_expression;
1586 struct lttng_event_exclusion *exclusions;
1587 struct lttng_bytecode *bytecode;
1588 const enum lttng_error_code ret_code = receive_lttng_event(
1589 cmd_ctx, *sock, sock_error, &event,
1590 &filter_expression, &bytecode, &exclusions);
1591
1592 if (ret_code != LTTNG_OK) {
1593 ret = (int) ret_code;
1594 goto error;
1595 }
1596
1597 /*
1598 * Ownership of filter_expression, exclusions, and bytecode is
1599 * always transferred.
1600 */
1601 ret = cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT ?
1602 cmd_enable_event(cmd_ctx, event,
1603 filter_expression, exclusions,
1604 bytecode,
1605 the_kernel_poll_pipe[1]) :
1606 cmd_disable_event(cmd_ctx, event,
1607 filter_expression, bytecode,
1608 exclusions);
1609 lttng_event_destroy(event);
1610 break;
1611 }
1612 case LTTNG_LIST_TRACEPOINTS:
1613 {
1614 enum lttng_error_code ret_code;
1615 size_t original_payload_size;
1616 size_t payload_size;
1617 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1618
1619 ret = setup_empty_lttng_msg(cmd_ctx);
1620 if (ret) {
1621 ret = LTTNG_ERR_NOMEM;
1622 goto setup_error;
1623 }
1624
1625 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1626
1627 session_lock_list();
1628 ret_code = cmd_list_tracepoints(cmd_ctx->lsm.domain.type,
1629 &cmd_ctx->reply_payload);
1630 session_unlock_list();
1631 if (ret_code != LTTNG_OK) {
1632 ret = (int) ret_code;
1633 goto error;
1634 }
1635
1636 payload_size = cmd_ctx->reply_payload.buffer.size -
1637 command_header_size - original_payload_size;
1638 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1639
1640 ret = LTTNG_OK;
1641 break;
1642 }
1643 case LTTNG_LIST_TRACEPOINT_FIELDS:
1644 {
1645 enum lttng_error_code ret_code;
1646 size_t original_payload_size;
1647 size_t payload_size;
1648 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1649
1650 ret = setup_empty_lttng_msg(cmd_ctx);
1651 if (ret) {
1652 ret = LTTNG_ERR_NOMEM;
1653 goto setup_error;
1654 }
1655
1656 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1657
1658 session_lock_list();
1659 ret_code = cmd_list_tracepoint_fields(
1660 cmd_ctx->lsm.domain.type, &cmd_ctx->reply_payload);
1661 session_unlock_list();
1662 if (ret_code != LTTNG_OK) {
1663 ret = (int) ret_code;
1664 goto error;
1665 }
1666
1667 payload_size = cmd_ctx->reply_payload.buffer.size -
1668 command_header_size - original_payload_size;
1669 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1670
1671 ret = LTTNG_OK;
1672 break;
1673 }
1674 case LTTNG_LIST_SYSCALLS:
1675 {
1676 enum lttng_error_code ret_code;
1677 size_t original_payload_size;
1678 size_t payload_size;
1679 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1680
1681 ret = setup_empty_lttng_msg(cmd_ctx);
1682 if (ret) {
1683 ret = LTTNG_ERR_NOMEM;
1684 goto setup_error;
1685 }
1686
1687 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1688
1689 ret_code = cmd_list_syscalls(&cmd_ctx->reply_payload);
1690 if (ret_code != LTTNG_OK) {
1691 ret = (int) ret_code;
1692 goto error;
1693 }
1694
1695 payload_size = cmd_ctx->reply_payload.buffer.size -
1696 command_header_size - original_payload_size;
1697 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1698
1699 ret = LTTNG_OK;
1700 break;
1701 }
1702 case LTTNG_SET_CONSUMER_URI:
1703 {
1704 size_t nb_uri, len;
1705 struct lttng_uri *uris;
1706
1707 nb_uri = cmd_ctx->lsm.u.uri.size;
1708 len = nb_uri * sizeof(struct lttng_uri);
1709
1710 if (nb_uri == 0) {
1711 ret = LTTNG_ERR_INVALID;
1712 goto error;
1713 }
1714
1715 uris = (lttng_uri *) zmalloc(len);
1716 if (uris == NULL) {
1717 ret = LTTNG_ERR_FATAL;
1718 goto error;
1719 }
1720
1721 /* Receive variable len data */
1722 DBG("Receiving %zu URI(s) from client ...", nb_uri);
1723 ret = lttcomm_recv_unix_sock(*sock, uris, len);
1724 if (ret <= 0) {
1725 DBG("No URIs received from client... continuing");
1726 *sock_error = 1;
1727 ret = LTTNG_ERR_SESSION_FAIL;
1728 free(uris);
1729 goto error;
1730 }
1731
1732 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
1733 free(uris);
1734 if (ret != LTTNG_OK) {
1735 goto error;
1736 }
1737
1738
1739 break;
1740 }
1741 case LTTNG_START_TRACE:
1742 {
1743 /*
1744 * On the first start, if we have a kernel session and we have
1745 * enabled time or size-based rotations, we have to make sure
1746 * the kernel tracer supports it.
1747 */
1748 if (!cmd_ctx->session->has_been_started && \
1749 cmd_ctx->session->kernel_session && \
1750 (cmd_ctx->session->rotate_timer_period || \
1751 cmd_ctx->session->rotate_size) && \
1752 !check_rotate_compatible()) {
1753 DBG("Kernel tracer version is not compatible with the rotation feature");
1754 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
1755 goto error;
1756 }
1757 ret = cmd_start_trace(cmd_ctx->session);
1758 break;
1759 }
1760 case LTTNG_STOP_TRACE:
1761 {
1762 ret = cmd_stop_trace(cmd_ctx->session);
1763 break;
1764 }
1765 case LTTNG_DESTROY_SESSION:
1766 {
1767 ret = cmd_destroy_session(cmd_ctx->session,
1768 the_notification_thread_handle, sock);
1769 break;
1770 }
1771 case LTTNG_LIST_DOMAINS:
1772 {
1773 ssize_t nb_dom;
1774 struct lttng_domain *domains = NULL;
1775
1776 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
1777 if (nb_dom < 0) {
1778 /* Return value is a negative lttng_error_code. */
1779 ret = -nb_dom;
1780 goto error;
1781 }
1782
1783 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
1784 nb_dom * sizeof(struct lttng_domain));
1785 free(domains);
1786
1787 if (ret < 0) {
1788 goto setup_error;
1789 }
1790
1791 ret = LTTNG_OK;
1792 break;
1793 }
1794 case LTTNG_LIST_CHANNELS:
1795 {
1796 enum lttng_error_code ret_code;
1797 size_t original_payload_size;
1798 size_t payload_size;
1799 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1800
1801 ret = setup_empty_lttng_msg(cmd_ctx);
1802 if (ret) {
1803 ret = LTTNG_ERR_NOMEM;
1804 goto setup_error;
1805 }
1806
1807 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1808
1809 ret_code = cmd_list_channels(cmd_ctx->lsm.domain.type,
1810 cmd_ctx->session, &cmd_ctx->reply_payload);
1811 if (ret_code != LTTNG_OK) {
1812 ret = (int) ret_code;
1813 goto error;
1814 }
1815
1816 payload_size = cmd_ctx->reply_payload.buffer.size -
1817 command_header_size - original_payload_size;
1818 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1819
1820 ret = LTTNG_OK;
1821 break;
1822 }
1823 case LTTNG_LIST_EVENTS:
1824 {
1825 enum lttng_error_code ret_code;
1826 size_t original_payload_size;
1827 size_t payload_size;
1828 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1829
1830 ret = setup_empty_lttng_msg(cmd_ctx);
1831 if (ret) {
1832 ret = LTTNG_ERR_NOMEM;
1833 goto setup_error;
1834 }
1835
1836 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1837
1838 ret_code = cmd_list_events(cmd_ctx->lsm.domain.type,
1839 cmd_ctx->session,
1840 cmd_ctx->lsm.u.list.channel_name, &cmd_ctx->reply_payload);
1841 if (ret_code != LTTNG_OK) {
1842 ret = (int) ret_code;
1843 goto error;
1844 }
1845
1846 payload_size = cmd_ctx->reply_payload.buffer.size -
1847 command_header_size - original_payload_size;
1848 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1849
1850 ret = LTTNG_OK;
1851 break;
1852 }
1853 case LTTNG_LIST_SESSIONS:
1854 {
1855 unsigned int nr_sessions;
1856 lttng_session *sessions_payload;
1857 size_t payload_len;
1858
1859 session_lock_list();
1860 nr_sessions = lttng_sessions_count(
1861 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1862 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1863
1864 payload_len = (sizeof(struct lttng_session) * nr_sessions) +
1865 (sizeof(struct lttng_session_extended) * nr_sessions);
1866 sessions_payload = (lttng_session *) zmalloc(payload_len);
1867
1868 if (!sessions_payload) {
1869 session_unlock_list();
1870 ret = -ENOMEM;
1871 goto setup_error;
1872 }
1873
1874 cmd_list_lttng_sessions(sessions_payload, nr_sessions,
1875 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1876 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1877 session_unlock_list();
1878
1879 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload,
1880 payload_len);
1881 free(sessions_payload);
1882
1883 if (ret < 0) {
1884 goto setup_error;
1885 }
1886
1887 ret = LTTNG_OK;
1888 break;
1889 }
1890 case LTTNG_REGISTER_CONSUMER:
1891 {
1892 struct consumer_data *cdata;
1893
1894 switch (cmd_ctx->lsm.domain.type) {
1895 case LTTNG_DOMAIN_KERNEL:
1896 cdata = &the_kconsumer_data;
1897 break;
1898 default:
1899 ret = LTTNG_ERR_UND;
1900 goto error;
1901 }
1902
1903 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1904 cmd_ctx->lsm.u.reg.path, cdata);
1905 break;
1906 }
1907 case LTTNG_DATA_PENDING:
1908 {
1909 int pending_ret;
1910 uint8_t pending_ret_byte;
1911
1912 pending_ret = cmd_data_pending(cmd_ctx->session);
1913
1914 /*
1915 * FIXME
1916 *
1917 * This function may returns 0 or 1 to indicate whether or not
1918 * there is data pending. In case of error, it should return an
1919 * LTTNG_ERR code. However, some code paths may still return
1920 * a nondescript error code, which we handle by returning an
1921 * "unknown" error.
1922 */
1923 if (pending_ret == 0 || pending_ret == 1) {
1924 /*
1925 * ret will be set to LTTNG_OK at the end of
1926 * this function.
1927 */
1928 } else if (pending_ret < 0) {
1929 ret = LTTNG_ERR_UNK;
1930 goto setup_error;
1931 } else {
1932 ret = pending_ret;
1933 goto setup_error;
1934 }
1935
1936 pending_ret_byte = (uint8_t) pending_ret;
1937
1938 /* 1 byte to return whether or not data is pending */
1939 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1940 &pending_ret_byte, 1);
1941
1942 if (ret < 0) {
1943 goto setup_error;
1944 }
1945
1946 ret = LTTNG_OK;
1947 break;
1948 }
1949 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1950 {
1951 uint32_t snapshot_id;
1952 struct lttcomm_lttng_output_id reply;
1953 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
1954
1955 ret = cmd_snapshot_add_output(cmd_ctx->session,
1956 &output,
1957 &snapshot_id);
1958 if (ret != LTTNG_OK) {
1959 goto error;
1960 }
1961 reply.id = snapshot_id;
1962
1963 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
1964 sizeof(reply));
1965 if (ret < 0) {
1966 goto setup_error;
1967 }
1968
1969 /* Copy output list into message payload */
1970 ret = LTTNG_OK;
1971 break;
1972 }
1973 case LTTNG_SNAPSHOT_DEL_OUTPUT:
1974 {
1975 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
1976 ret = cmd_snapshot_del_output(cmd_ctx->session, &output);
1977 break;
1978 }
1979 case LTTNG_SNAPSHOT_LIST_OUTPUT:
1980 {
1981 ssize_t nb_output;
1982 struct lttng_snapshot_output *outputs = NULL;
1983
1984 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
1985 if (nb_output < 0) {
1986 ret = -nb_output;
1987 goto error;
1988 }
1989
1990 LTTNG_ASSERT((nb_output > 0 && outputs) || nb_output == 0);
1991 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
1992 nb_output * sizeof(struct lttng_snapshot_output));
1993 free(outputs);
1994
1995 if (ret < 0) {
1996 goto setup_error;
1997 }
1998
1999 ret = LTTNG_OK;
2000 break;
2001 }
2002 case LTTNG_SNAPSHOT_RECORD:
2003 {
2004 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_record.output;
2005 ret = cmd_snapshot_record(cmd_ctx->session,
2006 &output,
2007 cmd_ctx->lsm.u.snapshot_record.wait);
2008 break;
2009 }
2010 case LTTNG_CREATE_SESSION_EXT:
2011 {
2012 struct lttng_dynamic_buffer payload;
2013 struct lttng_session_descriptor *return_descriptor = NULL;
2014
2015 lttng_dynamic_buffer_init(&payload);
2016 ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor);
2017 if (ret != LTTNG_OK) {
2018 goto error;
2019 }
2020
2021 ret = lttng_session_descriptor_serialize(return_descriptor,
2022 &payload);
2023 if (ret) {
2024 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2025 lttng_session_descriptor_destroy(return_descriptor);
2026 ret = LTTNG_ERR_NOMEM;
2027 goto error;
2028 }
2029 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data,
2030 payload.size);
2031 if (ret) {
2032 lttng_session_descriptor_destroy(return_descriptor);
2033 ret = LTTNG_ERR_NOMEM;
2034 goto error;
2035 }
2036 lttng_dynamic_buffer_reset(&payload);
2037 lttng_session_descriptor_destroy(return_descriptor);
2038 ret = LTTNG_OK;
2039 break;
2040 }
2041 case LTTNG_SAVE_SESSION:
2042 {
2043 ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr,
2044 &cmd_ctx->creds);
2045 break;
2046 }
2047 case LTTNG_SET_SESSION_SHM_PATH:
2048 {
2049 ret = cmd_set_session_shm_path(cmd_ctx->session,
2050 cmd_ctx->lsm.u.set_shm_path.shm_path);
2051 break;
2052 }
2053 case LTTNG_REGENERATE_METADATA:
2054 {
2055 ret = cmd_regenerate_metadata(cmd_ctx->session);
2056 break;
2057 }
2058 case LTTNG_REGENERATE_STATEDUMP:
2059 {
2060 ret = cmd_regenerate_statedump(cmd_ctx->session);
2061 break;
2062 }
2063 case LTTNG_REGISTER_TRIGGER:
2064 {
2065 struct lttng_trigger *payload_trigger;
2066 struct lttng_trigger *return_trigger;
2067 size_t original_reply_payload_size;
2068 size_t reply_payload_size;
2069 const struct lttng_credentials cmd_creds = {
2070 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2071 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2072 };
2073
2074 ret = setup_empty_lttng_msg(cmd_ctx);
2075 if (ret) {
2076 ret = LTTNG_ERR_NOMEM;
2077 goto setup_error;
2078 }
2079
2080 ret = receive_lttng_trigger(
2081 cmd_ctx, *sock, sock_error, &payload_trigger);
2082 if (ret != LTTNG_OK) {
2083 goto error;
2084 }
2085
2086 original_reply_payload_size = cmd_ctx->reply_payload.buffer.size;
2087
2088 ret = cmd_register_trigger(&cmd_creds, payload_trigger,
2089 cmd_ctx->lsm.u.trigger.is_trigger_anonymous,
2090 the_notification_thread_handle,
2091 &return_trigger);
2092 if (ret != LTTNG_OK) {
2093 lttng_trigger_put(payload_trigger);
2094 goto error;
2095 }
2096
2097 ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload);
2098 lttng_trigger_put(payload_trigger);
2099 lttng_trigger_put(return_trigger);
2100 if (ret) {
2101 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2102 ret = LTTNG_ERR_NOMEM;
2103 goto error;
2104 }
2105
2106 reply_payload_size = cmd_ctx->reply_payload.buffer.size -
2107 original_reply_payload_size;
2108
2109 update_lttng_msg(cmd_ctx, 0, reply_payload_size);
2110
2111 ret = LTTNG_OK;
2112 break;
2113 }
2114 case LTTNG_UNREGISTER_TRIGGER:
2115 {
2116 struct lttng_trigger *payload_trigger;
2117 const struct lttng_credentials cmd_creds = {
2118 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2119 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2120 };
2121
2122 ret = receive_lttng_trigger(
2123 cmd_ctx, *sock, sock_error, &payload_trigger);
2124 if (ret != LTTNG_OK) {
2125 goto error;
2126 }
2127
2128 ret = cmd_unregister_trigger(&cmd_creds, payload_trigger,
2129 the_notification_thread_handle);
2130 lttng_trigger_put(payload_trigger);
2131 break;
2132 }
2133 case LTTNG_ROTATE_SESSION:
2134 {
2135 struct lttng_rotate_session_return rotate_return;
2136
2137 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
2138
2139 memset(&rotate_return, 0, sizeof(rotate_return));
2140 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2141 DBG("Kernel tracer version is not compatible with the rotation feature");
2142 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2143 goto error;
2144 }
2145
2146 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return,
2147 false,
2148 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
2149 if (ret < 0) {
2150 ret = -ret;
2151 goto error;
2152 }
2153
2154 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
2155 sizeof(rotate_return));
2156 if (ret < 0) {
2157 ret = -ret;
2158 goto error;
2159 }
2160
2161 ret = LTTNG_OK;
2162 break;
2163 }
2164 case LTTNG_ROTATION_GET_INFO:
2165 {
2166 struct lttng_rotation_get_info_return get_info_return;
2167
2168 memset(&get_info_return, 0, sizeof(get_info_return));
2169 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
2170 cmd_ctx->lsm.u.get_rotation_info.rotation_id);
2171 if (ret < 0) {
2172 ret = -ret;
2173 goto error;
2174 }
2175
2176 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
2177 sizeof(get_info_return));
2178 if (ret < 0) {
2179 ret = -ret;
2180 goto error;
2181 }
2182
2183 ret = LTTNG_OK;
2184 break;
2185 }
2186 case LTTNG_ROTATION_SET_SCHEDULE:
2187 {
2188 bool set_schedule;
2189 enum lttng_rotation_schedule_type schedule_type;
2190 uint64_t value;
2191
2192 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2193 DBG("Kernel tracer version does not support session rotations");
2194 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2195 goto error;
2196 }
2197
2198 set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1;
2199 schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type;
2200 value = cmd_ctx->lsm.u.rotation_set_schedule.value;
2201
2202 ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule,
2203 schedule_type, value,
2204 the_notification_thread_handle);
2205 if (ret != LTTNG_OK) {
2206 goto error;
2207 }
2208
2209 break;
2210 }
2211 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
2212 {
2213 lttng_session_list_schedules_return schedules;
2214
2215 schedules.periodic.set = !!cmd_ctx->session->rotate_timer_period;
2216 schedules.periodic.value = cmd_ctx->session->rotate_timer_period;
2217 schedules.size.set = !!cmd_ctx->session->rotate_size;
2218 schedules.size.value = cmd_ctx->session->rotate_size;
2219
2220 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
2221 sizeof(schedules));
2222 if (ret < 0) {
2223 ret = -ret;
2224 goto error;
2225 }
2226
2227 ret = LTTNG_OK;
2228 break;
2229 }
2230 case LTTNG_CLEAR_SESSION:
2231 {
2232 ret = cmd_clear_session(cmd_ctx->session, sock);
2233 break;
2234 }
2235 case LTTNG_LIST_TRIGGERS:
2236 {
2237 struct lttng_triggers *return_triggers = NULL;
2238 size_t original_payload_size;
2239 size_t payload_size;
2240
2241 ret = setup_empty_lttng_msg(cmd_ctx);
2242 if (ret) {
2243 ret = LTTNG_ERR_NOMEM;
2244 goto setup_error;
2245 }
2246
2247 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2248
2249 ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle,
2250 &return_triggers);
2251 if (ret != LTTNG_OK) {
2252 goto error;
2253 }
2254
2255 LTTNG_ASSERT(return_triggers);
2256 ret = lttng_triggers_serialize(
2257 return_triggers, &cmd_ctx->reply_payload);
2258 lttng_triggers_destroy(return_triggers);
2259 if (ret) {
2260 ERR("Failed to serialize triggers in reply to `list triggers` command");
2261 ret = LTTNG_ERR_NOMEM;
2262 goto error;
2263 }
2264
2265 payload_size = cmd_ctx->reply_payload.buffer.size -
2266 original_payload_size;
2267
2268 update_lttng_msg(cmd_ctx, 0, payload_size);
2269
2270 ret = LTTNG_OK;
2271 break;
2272 }
2273 case LTTNG_EXECUTE_ERROR_QUERY:
2274 {
2275 struct lttng_error_query *query;
2276 const struct lttng_credentials cmd_creds = {
2277 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2278 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2279 };
2280 struct lttng_error_query_results *results = NULL;
2281 size_t original_payload_size;
2282 size_t payload_size;
2283
2284 ret = setup_empty_lttng_msg(cmd_ctx);
2285 if (ret) {
2286 ret = LTTNG_ERR_NOMEM;
2287 goto setup_error;
2288 }
2289
2290 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2291
2292 ret = receive_lttng_error_query(
2293 cmd_ctx, *sock, sock_error, &query);
2294 if (ret != LTTNG_OK) {
2295 goto error;
2296 }
2297
2298 ret = cmd_execute_error_query(&cmd_creds, query, &results,
2299 the_notification_thread_handle);
2300 lttng_error_query_destroy(query);
2301 if (ret != LTTNG_OK) {
2302 goto error;
2303 }
2304
2305 LTTNG_ASSERT(results);
2306 ret = lttng_error_query_results_serialize(
2307 results, &cmd_ctx->reply_payload);
2308 lttng_error_query_results_destroy(results);
2309 if (ret) {
2310 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2311 ret = LTTNG_ERR_NOMEM;
2312 goto error;
2313 }
2314
2315 payload_size = cmd_ctx->reply_payload.buffer.size -
2316 original_payload_size;
2317
2318 update_lttng_msg(cmd_ctx, 0, payload_size);
2319
2320 ret = LTTNG_OK;
2321
2322 break;
2323 }
2324 default:
2325 ret = LTTNG_ERR_UND;
2326 break;
2327 }
2328
2329 error:
2330 if (cmd_ctx->reply_payload.buffer.size == 0) {
2331 DBG("Missing llm header, creating one.");
2332 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
2333 goto setup_error;
2334 }
2335 }
2336 /* Set return code */
2337 ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret;
2338 setup_error:
2339 if (cmd_ctx->session) {
2340 session_unlock(cmd_ctx->session);
2341 session_put(cmd_ctx->session);
2342 cmd_ctx->session = NULL;
2343 }
2344 if (need_tracing_session) {
2345 session_unlock_list();
2346 }
2347 init_setup_error:
2348 LTTNG_ASSERT(!rcu_read_ongoing());
2349 return ret;
2350 }
2351
2352 static int create_client_sock(void)
2353 {
2354 int ret, client_sock;
2355 const mode_t old_umask = umask(0);
2356
2357 /* Create client tool unix socket */
2358 client_sock = lttcomm_create_unix_sock(
2359 the_config.client_unix_sock_path.value);
2360 if (client_sock < 0) {
2361 ERR("Create unix sock failed: %s",
2362 the_config.client_unix_sock_path.value);
2363 ret = -1;
2364 goto end;
2365 }
2366
2367 /* Set the cloexec flag */
2368 ret = utils_set_fd_cloexec(client_sock);
2369 if (ret < 0) {
2370 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2371 "Continuing but note that the consumer daemon will have a "
2372 "reference to this socket on exec()", client_sock);
2373 }
2374
2375 /* File permission MUST be 660 */
2376 ret = chmod(the_config.client_unix_sock_path.value,
2377 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2378 if (ret < 0) {
2379 ERR("Set file permissions failed: %s",
2380 the_config.client_unix_sock_path.value);
2381 PERROR("chmod");
2382 (void) lttcomm_close_unix_sock(client_sock);
2383 ret = -1;
2384 goto end;
2385 }
2386 DBG("Created client socket (fd = %i)", client_sock);
2387 ret = client_sock;
2388 end:
2389 umask(old_umask);
2390 return ret;
2391 }
2392
2393 static void cleanup_client_thread(void *data)
2394 {
2395 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
2396
2397 lttng_pipe_destroy(quit_pipe);
2398 }
2399
2400 static void thread_init_cleanup(void *data)
2401 {
2402 set_thread_status(false);
2403 }
2404
2405 /*
2406 * This thread manage all clients request using the unix client socket for
2407 * communication.
2408 */
2409 static void *thread_manage_clients(void *data)
2410 {
2411 int sock = -1, ret, i, pollfd, err = -1;
2412 int sock_error;
2413 uint32_t revents, nb_fd;
2414 struct lttng_poll_event events;
2415 const int client_sock = thread_state.client_sock;
2416 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
2417 const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe);
2418 struct command_ctx cmd_ctx = {};
2419
2420 DBG("[thread] Manage client started");
2421
2422 lttng_payload_init(&cmd_ctx.reply_payload);
2423
2424 is_root = (getuid() == 0);
2425
2426 pthread_cleanup_push(thread_init_cleanup, NULL);
2427
2428 rcu_register_thread();
2429
2430 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
2431
2432 health_code_update();
2433
2434 ret = lttcomm_listen_unix_sock(client_sock);
2435 if (ret < 0) {
2436 goto error_listen;
2437 }
2438
2439 /*
2440 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2441 * more will be added to this poll set.
2442 */
2443 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2444 if (ret < 0) {
2445 goto error_create_poll;
2446 }
2447
2448 /* Add the application registration socket */
2449 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2450 if (ret < 0) {
2451 goto error;
2452 }
2453
2454 /* Add thread quit pipe */
2455 ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR);
2456 if (ret < 0) {
2457 goto error;
2458 }
2459
2460 /* Set state as running. */
2461 set_thread_status(true);
2462 pthread_cleanup_pop(0);
2463
2464 /* This testpoint is after we signal readiness to the parent. */
2465 if (testpoint(sessiond_thread_manage_clients)) {
2466 goto error;
2467 }
2468
2469 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
2470 goto error;
2471 }
2472
2473 health_code_update();
2474
2475 while (1) {
2476 const struct cmd_completion_handler *cmd_completion_handler;
2477
2478 cmd_ctx.creds.uid = UINT32_MAX;
2479 cmd_ctx.creds.gid = UINT32_MAX;
2480 cmd_ctx.creds.pid = 0;
2481 cmd_ctx.session = NULL;
2482 lttng_payload_clear(&cmd_ctx.reply_payload);
2483 cmd_ctx.lttng_msg_size = 0;
2484
2485 DBG("Accepting client command ...");
2486
2487 /* Inifinite blocking call, waiting for transmission */
2488 restart:
2489 health_poll_entry();
2490 ret = lttng_poll_wait(&events, -1);
2491 health_poll_exit();
2492 if (ret < 0) {
2493 /*
2494 * Restart interrupted system call.
2495 */
2496 if (errno == EINTR) {
2497 goto restart;
2498 }
2499 goto error;
2500 }
2501
2502 nb_fd = ret;
2503
2504 for (i = 0; i < nb_fd; i++) {
2505 revents = LTTNG_POLL_GETEV(&events, i);
2506 pollfd = LTTNG_POLL_GETFD(&events, i);
2507
2508 health_code_update();
2509
2510 if (pollfd == thread_quit_pipe_fd) {
2511 err = 0;
2512 goto exit;
2513 } else {
2514 /* Event on the registration socket */
2515 if (revents & LPOLLIN) {
2516 continue;
2517 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2518 ERR("Client socket poll error");
2519 goto error;
2520 } else {
2521 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2522 goto error;
2523 }
2524 }
2525 }
2526
2527 DBG("Wait for client response");
2528
2529 health_code_update();
2530
2531 sock = lttcomm_accept_unix_sock(client_sock);
2532 if (sock < 0) {
2533 goto error;
2534 }
2535
2536 /*
2537 * Set the CLOEXEC flag. Return code is useless because either way, the
2538 * show must go on.
2539 */
2540 (void) utils_set_fd_cloexec(sock);
2541
2542 /* Set socket option for credentials retrieval */
2543 ret = lttcomm_setsockopt_creds_unix_sock(sock);
2544 if (ret < 0) {
2545 goto error;
2546 }
2547
2548 health_code_update();
2549
2550 /*
2551 * Data is received from the lttng client. The struct
2552 * lttcomm_session_msg (lsm) contains the command and data request of
2553 * the client.
2554 */
2555 DBG("Receiving data from client ...");
2556 ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm,
2557 sizeof(struct lttcomm_session_msg), &cmd_ctx.creds);
2558 if (ret != sizeof(struct lttcomm_session_msg)) {
2559 DBG("Incomplete recv() from client... continuing");
2560 ret = close(sock);
2561 if (ret) {
2562 PERROR("close");
2563 }
2564 sock = -1;
2565 continue;
2566 }
2567
2568 health_code_update();
2569
2570 // TODO: Validate cmd_ctx including sanity check for
2571 // security purpose.
2572
2573 rcu_thread_online();
2574 /*
2575 * This function dispatch the work to the kernel or userspace tracer
2576 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2577 * informations for the client. The command context struct contains
2578 * everything this function may needs.
2579 */
2580 ret = process_client_msg(&cmd_ctx, &sock, &sock_error);
2581 rcu_thread_offline();
2582 if (ret < 0) {
2583 if (sock >= 0) {
2584 ret = close(sock);
2585 if (ret) {
2586 PERROR("close");
2587 }
2588 }
2589 sock = -1;
2590 /*
2591 * TODO: Inform client somehow of the fatal error. At
2592 * this point, ret < 0 means that a zmalloc failed
2593 * (ENOMEM). Error detected but still accept
2594 * command, unless a socket error has been
2595 * detected.
2596 */
2597 continue;
2598 }
2599
2600 if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) {
2601 WARN("Command returned an invalid status code, returning unknown error: "
2602 "command type = %s (%d), ret = %d",
2603 lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx.lsm.cmd_type),
2604 cmd_ctx.lsm.cmd_type, ret);
2605 ret = LTTNG_ERR_UNK;
2606 }
2607
2608 cmd_completion_handler = cmd_pop_completion_handler();
2609 if (cmd_completion_handler) {
2610 enum lttng_error_code completion_code;
2611
2612 completion_code = cmd_completion_handler->run(
2613 cmd_completion_handler->data);
2614 if (completion_code != LTTNG_OK) {
2615 continue;
2616 }
2617 }
2618
2619 health_code_update();
2620
2621 if (sock >= 0) {
2622 struct lttng_payload_view view =
2623 lttng_payload_view_from_payload(
2624 &cmd_ctx.reply_payload,
2625 0, -1);
2626 struct lttcomm_lttng_msg *llm = (typeof(
2627 llm)) cmd_ctx.reply_payload.buffer.data;
2628
2629 LTTNG_ASSERT(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm));
2630 LTTNG_ASSERT(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size);
2631
2632 llm->fd_count = lttng_payload_view_get_fd_handle_count(&view);
2633
2634 DBG("Sending response (size: %d, retcode: %s (%d))",
2635 cmd_ctx.lttng_msg_size,
2636 lttng_strerror(-llm->ret_code),
2637 llm->ret_code);
2638 ret = send_unix_sock(sock, &view);
2639 if (ret < 0) {
2640 ERR("Failed to send data back to client");
2641 }
2642
2643 /* End of transmission */
2644 ret = close(sock);
2645 if (ret) {
2646 PERROR("close");
2647 }
2648 }
2649 sock = -1;
2650
2651 health_code_update();
2652 }
2653
2654 exit:
2655 error:
2656 if (sock >= 0) {
2657 ret = close(sock);
2658 if (ret) {
2659 PERROR("close");
2660 }
2661 }
2662
2663 lttng_poll_clean(&events);
2664
2665 error_listen:
2666 error_create_poll:
2667 unlink(the_config.client_unix_sock_path.value);
2668 ret = close(client_sock);
2669 if (ret) {
2670 PERROR("close");
2671 }
2672
2673 if (err) {
2674 health_error();
2675 ERR("Health error occurred in %s", __func__);
2676 }
2677
2678 health_unregister(the_health_sessiond);
2679
2680 DBG("Client thread dying");
2681 lttng_payload_reset(&cmd_ctx.reply_payload);
2682 rcu_unregister_thread();
2683 return NULL;
2684 }
2685
2686 static
2687 bool shutdown_client_thread(void *thread_data)
2688 {
2689 struct lttng_pipe *client_quit_pipe = (lttng_pipe *) thread_data;
2690 const int write_fd = lttng_pipe_get_writefd(client_quit_pipe);
2691
2692 return notify_thread_pipe(write_fd) == 1;
2693 }
2694
2695 struct lttng_thread *launch_client_thread(void)
2696 {
2697 bool thread_running;
2698 struct lttng_pipe *client_quit_pipe;
2699 struct lttng_thread *thread = NULL;
2700 int client_sock_fd = -1;
2701
2702 sem_init(&thread_state.ready, 0, 0);
2703 client_quit_pipe = lttng_pipe_open(FD_CLOEXEC);
2704 if (!client_quit_pipe) {
2705 goto error;
2706 }
2707
2708 client_sock_fd = create_client_sock();
2709 if (client_sock_fd < 0) {
2710 goto error;
2711 }
2712
2713 thread_state.client_sock = client_sock_fd;
2714 thread = lttng_thread_create("Client management",
2715 thread_manage_clients,
2716 shutdown_client_thread,
2717 cleanup_client_thread,
2718 client_quit_pipe);
2719 if (!thread) {
2720 goto error;
2721 }
2722 /* The client thread now owns the client sock fd and the quit pipe. */
2723 client_sock_fd = -1;
2724 client_quit_pipe = NULL;
2725
2726 /*
2727 * This thread is part of the threads that need to be fully
2728 * initialized before the session daemon is marked as "ready".
2729 */
2730 thread_running = wait_thread_status();
2731 if (!thread_running) {
2732 goto error;
2733 }
2734 return thread;
2735 error:
2736 if (client_sock_fd >= 0) {
2737 if (close(client_sock_fd)) {
2738 PERROR("Failed to close client socket");
2739 }
2740 }
2741 lttng_thread_put(thread);
2742 cleanup_client_thread(client_quit_pipe);
2743 return NULL;
2744 }
LTTng 2.0 tools and control repository
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