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


5055d59e8e1595c5451701fdc91c17a96cff7599
[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 static enum lttng_error_code receive_lttng_event_context(
838 const struct command_ctx *cmd_ctx,
839 int sock,
840 int *sock_error,
841 struct lttng_event_context **out_event_context)
842 {
843 int ret;
844 const size_t event_context_len =
845 (size_t) cmd_ctx->lsm.u.context.length;
846 ssize_t sock_recv_len;
847 enum lttng_error_code ret_code;
848 struct lttng_payload event_context_payload;
849 struct lttng_event_context *context = NULL;
850
851 lttng_payload_init(&event_context_payload);
852
853 ret = lttng_dynamic_buffer_set_size(&event_context_payload.buffer,
854 event_context_len);
855 if (ret) {
856 ret_code = LTTNG_ERR_NOMEM;
857 goto end;
858 }
859
860 sock_recv_len = lttcomm_recv_unix_sock(
861 sock, event_context_payload.buffer.data,
862 event_context_len);
863 if (sock_recv_len < 0 || sock_recv_len != event_context_len) {
864 ERR("Failed to receive event context in command payload");
865 *sock_error = 1;
866 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
867 goto end;
868 }
869
870 /* Deserialize event. */
871 {
872 ssize_t len;
873 struct lttng_payload_view event_context_view =
874 lttng_payload_view_from_payload(
875 &event_context_payload, 0, -1);
876
877 len = lttng_event_context_create_from_payload(
878 &event_context_view, &context);
879
880 if (len < 0) {
881 ERR("Failed to create a event context from the received buffer");
882 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
883 goto end;
884 }
885
886 if (len != event_context_len) {
887 ERR("Event context from the received buffer is not the advertised length: expected length = %zu, payload length = %zd", event_context_len, len);
888 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
889 goto end;
890 }
891 }
892
893 *out_event_context = context;
894 context = NULL;
895 ret_code = LTTNG_OK;
896
897 end:
898 lttng_event_context_destroy(context);
899 lttng_payload_reset(&event_context_payload);
900 return ret_code;
901 }
902
903 /*
904 * Version of setup_lttng_msg() without command header.
905 */
906 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
907 void *payload_buf, size_t payload_len)
908 {
909 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
910 }
911
912 /*
913 * Check if the current kernel tracer supports the session rotation feature.
914 * Return 1 if it does, 0 otherwise.
915 */
916 static int check_rotate_compatible(void)
917 {
918 int ret = 1;
919
920 if (the_kernel_tracer_version.major != 2 ||
921 the_kernel_tracer_version.minor < 11) {
922 DBG("Kernel tracer version is not compatible with the rotation feature");
923 ret = 0;
924 }
925
926 return ret;
927 }
928
929 /*
930 * Send data on a unix socket using the liblttsessiondcomm API.
931 *
932 * Return lttcomm error code.
933 */
934 static int send_unix_sock(int sock, struct lttng_payload_view *view)
935 {
936 int ret;
937 const int fd_count = lttng_payload_view_get_fd_handle_count(view);
938
939 /* Check valid length */
940 if (view->buffer.size == 0) {
941 ret = -1;
942 goto end;
943 }
944
945 ret = lttcomm_send_unix_sock(
946 sock, view->buffer.data, view->buffer.size);
947 if (ret < 0) {
948 goto end;
949 }
950
951 if (fd_count > 0) {
952 ret = lttcomm_send_payload_view_fds_unix_sock(sock, view);
953 if (ret < 0) {
954 goto end;
955 }
956 }
957
958 end:
959 return ret;
960 }
961
962 /*
963 * Process the command requested by the lttng client within the command
964 * context structure. This function make sure that the return structure (llm)
965 * is set and ready for transmission before returning.
966 *
967 * Return any error encountered or 0 for success.
968 *
969 * "sock" is only used for special-case var. len data.
970 * A command may assume the ownership of the socket, in which case its value
971 * should be set to -1.
972 *
973 * Should *NOT* be called with RCU read-side lock held.
974 */
975 static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
976 int *sock_error)
977 {
978 int ret = LTTNG_OK;
979 bool need_tracing_session = true;
980 bool need_domain;
981 bool need_consumerd;
982
983 DBG("Processing client command '%s\' (%d)",
984 lttcomm_sessiond_command_str(cmd_ctx->lsm.cmd_type),
985 cmd_ctx->lsm.cmd_type);
986
987 assert(!rcu_read_ongoing());
988
989 *sock_error = 0;
990
991 switch (cmd_ctx->lsm.cmd_type) {
992 case LTTNG_CREATE_SESSION_EXT:
993 case LTTNG_DESTROY_SESSION:
994 case LTTNG_LIST_SESSIONS:
995 case LTTNG_LIST_DOMAINS:
996 case LTTNG_START_TRACE:
997 case LTTNG_STOP_TRACE:
998 case LTTNG_DATA_PENDING:
999 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1000 case LTTNG_SNAPSHOT_DEL_OUTPUT:
1001 case LTTNG_SNAPSHOT_LIST_OUTPUT:
1002 case LTTNG_SNAPSHOT_RECORD:
1003 case LTTNG_SAVE_SESSION:
1004 case LTTNG_SET_SESSION_SHM_PATH:
1005 case LTTNG_REGENERATE_METADATA:
1006 case LTTNG_REGENERATE_STATEDUMP:
1007 case LTTNG_ROTATE_SESSION:
1008 case LTTNG_ROTATION_GET_INFO:
1009 case LTTNG_ROTATION_SET_SCHEDULE:
1010 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1011 case LTTNG_CLEAR_SESSION:
1012 case LTTNG_LIST_TRIGGERS:
1013 case LTTNG_EXECUTE_ERROR_QUERY:
1014 need_domain = false;
1015 break;
1016 default:
1017 need_domain = true;
1018 }
1019
1020 /* Needs a functioning consumerd? */
1021 switch (cmd_ctx->lsm.cmd_type) {
1022 case LTTNG_REGISTER_TRIGGER:
1023 case LTTNG_UNREGISTER_TRIGGER:
1024 case LTTNG_EXECUTE_ERROR_QUERY:
1025 need_consumerd = false;
1026 break;
1027 default:
1028 need_consumerd = true;
1029 break;
1030 }
1031
1032 if (the_config.no_kernel && need_domain &&
1033 cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) {
1034 if (!is_root) {
1035 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1036 } else {
1037 ret = LTTNG_ERR_KERN_NA;
1038 }
1039 goto error;
1040 }
1041
1042 /* Deny register consumer if we already have a spawned consumer. */
1043 if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) {
1044 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1045 if (the_kconsumer_data.pid > 0) {
1046 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1047 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1048 goto error;
1049 }
1050 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1051 }
1052
1053 /*
1054 * Check for command that don't needs to allocate a returned payload. We do
1055 * this here so we don't have to make the call for no payload at each
1056 * command.
1057 */
1058 switch(cmd_ctx->lsm.cmd_type) {
1059 case LTTNG_LIST_SESSIONS:
1060 case LTTNG_LIST_TRACEPOINTS:
1061 case LTTNG_LIST_TRACEPOINT_FIELDS:
1062 case LTTNG_LIST_DOMAINS:
1063 case LTTNG_LIST_CHANNELS:
1064 case LTTNG_LIST_EVENTS:
1065 case LTTNG_LIST_SYSCALLS:
1066 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1067 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1068 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1069 case LTTNG_DATA_PENDING:
1070 case LTTNG_ROTATE_SESSION:
1071 case LTTNG_ROTATION_GET_INFO:
1072 case LTTNG_REGISTER_TRIGGER:
1073 case LTTNG_LIST_TRIGGERS:
1074 case LTTNG_EXECUTE_ERROR_QUERY:
1075 break;
1076 default:
1077 /* Setup lttng message with no payload */
1078 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
1079 if (ret < 0) {
1080 /* This label does not try to unlock the session */
1081 goto init_setup_error;
1082 }
1083 }
1084
1085 /* Commands that DO NOT need a session. */
1086 switch (cmd_ctx->lsm.cmd_type) {
1087 case LTTNG_CREATE_SESSION_EXT:
1088 case LTTNG_LIST_SESSIONS:
1089 case LTTNG_LIST_TRACEPOINTS:
1090 case LTTNG_LIST_SYSCALLS:
1091 case LTTNG_LIST_TRACEPOINT_FIELDS:
1092 case LTTNG_SAVE_SESSION:
1093 case LTTNG_REGISTER_TRIGGER:
1094 case LTTNG_UNREGISTER_TRIGGER:
1095 case LTTNG_LIST_TRIGGERS:
1096 case LTTNG_EXECUTE_ERROR_QUERY:
1097 need_tracing_session = false;
1098 break;
1099 default:
1100 DBG("Getting session %s by name", cmd_ctx->lsm.session.name);
1101 /*
1102 * We keep the session list lock across _all_ commands
1103 * for now, because the per-session lock does not
1104 * handle teardown properly.
1105 */
1106 session_lock_list();
1107 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name);
1108 if (cmd_ctx->session == NULL) {
1109 ret = LTTNG_ERR_SESS_NOT_FOUND;
1110 goto error;
1111 } else {
1112 /* Acquire lock for the session */
1113 session_lock(cmd_ctx->session);
1114 }
1115 break;
1116 }
1117
1118 /*
1119 * Commands that need a valid session but should NOT create one if none
1120 * exists. Instead of creating one and destroying it when the command is
1121 * handled, process that right before so we save some round trip in useless
1122 * code path.
1123 */
1124 switch (cmd_ctx->lsm.cmd_type) {
1125 case LTTNG_DISABLE_CHANNEL:
1126 case LTTNG_DISABLE_EVENT:
1127 switch (cmd_ctx->lsm.domain.type) {
1128 case LTTNG_DOMAIN_KERNEL:
1129 if (!cmd_ctx->session->kernel_session) {
1130 ret = LTTNG_ERR_NO_CHANNEL;
1131 goto error;
1132 }
1133 break;
1134 case LTTNG_DOMAIN_JUL:
1135 case LTTNG_DOMAIN_LOG4J:
1136 case LTTNG_DOMAIN_PYTHON:
1137 case LTTNG_DOMAIN_UST:
1138 if (!cmd_ctx->session->ust_session) {
1139 ret = LTTNG_ERR_NO_CHANNEL;
1140 goto error;
1141 }
1142 break;
1143 default:
1144 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1145 goto error;
1146 }
1147 default:
1148 break;
1149 }
1150
1151 if (!need_domain) {
1152 goto skip_domain;
1153 }
1154
1155 /*
1156 * Check domain type for specific "pre-action".
1157 */
1158 switch (cmd_ctx->lsm.domain.type) {
1159 case LTTNG_DOMAIN_KERNEL:
1160 if (!is_root) {
1161 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1162 goto error;
1163 }
1164
1165 /* Kernel tracer check */
1166 if (!kernel_tracer_is_initialized()) {
1167 /* Basically, load kernel tracer modules */
1168 ret = init_kernel_tracer();
1169 if (ret != 0) {
1170 goto error;
1171 }
1172 }
1173
1174 /* Consumer is in an ERROR state. Report back to client */
1175 if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) ==
1176 CONSUMER_ERROR) {
1177 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1178 goto error;
1179 }
1180
1181 /* Need a session for kernel command */
1182 if (need_tracing_session) {
1183 if (cmd_ctx->session->kernel_session == NULL) {
1184 ret = create_kernel_session(cmd_ctx->session);
1185 if (ret != LTTNG_OK) {
1186 ret = LTTNG_ERR_KERN_SESS_FAIL;
1187 goto error;
1188 }
1189 }
1190
1191 /* Start the kernel consumer daemon */
1192 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1193 if (the_kconsumer_data.pid == 0 &&
1194 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1195 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1196 ret = start_consumerd(&the_kconsumer_data);
1197 if (ret < 0) {
1198 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1199 goto error;
1200 }
1201 uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED);
1202 } else {
1203 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1204 }
1205
1206 /*
1207 * The consumer was just spawned so we need to add the socket to
1208 * the consumer output of the session if exist.
1209 */
1210 ret = consumer_create_socket(&the_kconsumer_data,
1211 cmd_ctx->session->kernel_session->consumer);
1212 if (ret < 0) {
1213 goto error;
1214 }
1215 }
1216
1217 break;
1218 case LTTNG_DOMAIN_JUL:
1219 case LTTNG_DOMAIN_LOG4J:
1220 case LTTNG_DOMAIN_PYTHON:
1221 if (!agent_tracing_is_enabled()) {
1222 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1223 goto error;
1224 }
1225 /* Fallthrough */
1226 case LTTNG_DOMAIN_UST:
1227 {
1228 if (!ust_app_supported()) {
1229 ret = LTTNG_ERR_NO_UST;
1230 goto error;
1231 }
1232
1233 /* Consumer is in an ERROR state. Report back to client */
1234 if (need_consumerd &&
1235 uatomic_read(&the_ust_consumerd_state) ==
1236 CONSUMER_ERROR) {
1237 ret = LTTNG_ERR_NO_USTCONSUMERD;
1238 goto error;
1239 }
1240
1241 if (need_tracing_session) {
1242 /* Create UST session if none exist. */
1243 if (cmd_ctx->session->ust_session == NULL) {
1244 ret = create_ust_session(cmd_ctx->session,
1245 ALIGNED_CONST_PTR(cmd_ctx->lsm.domain));
1246 if (ret != LTTNG_OK) {
1247 goto error;
1248 }
1249 }
1250
1251 /* Start the UST consumer daemons */
1252 /* 64-bit */
1253 pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex);
1254 if (the_config.consumerd64_bin_path.value &&
1255 the_ustconsumer64_data.pid == 0 &&
1256 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1257 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1258 ret = start_consumerd(&the_ustconsumer64_data);
1259 if (ret < 0) {
1260 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
1261 uatomic_set(&the_ust_consumerd64_fd, -EINVAL);
1262 goto error;
1263 }
1264
1265 uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock);
1266 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1267 } else {
1268 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1269 }
1270
1271 /*
1272 * Setup socket for consumer 64 bit. No need for atomic access
1273 * since it was set above and can ONLY be set in this thread.
1274 */
1275 ret = consumer_create_socket(&the_ustconsumer64_data,
1276 cmd_ctx->session->ust_session->consumer);
1277 if (ret < 0) {
1278 goto error;
1279 }
1280
1281 /* 32-bit */
1282 pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex);
1283 if (the_config.consumerd32_bin_path.value &&
1284 the_ustconsumer32_data.pid == 0 &&
1285 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1286 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1287 ret = start_consumerd(&the_ustconsumer32_data);
1288 if (ret < 0) {
1289 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
1290 uatomic_set(&the_ust_consumerd32_fd, -EINVAL);
1291 goto error;
1292 }
1293
1294 uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock);
1295 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1296 } else {
1297 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1298 }
1299
1300 /*
1301 * Setup socket for consumer 32 bit. No need for atomic access
1302 * since it was set above and can ONLY be set in this thread.
1303 */
1304 ret = consumer_create_socket(&the_ustconsumer32_data,
1305 cmd_ctx->session->ust_session->consumer);
1306 if (ret < 0) {
1307 goto error;
1308 }
1309 }
1310 break;
1311 }
1312 default:
1313 break;
1314 }
1315 skip_domain:
1316
1317 /* Validate consumer daemon state when start/stop trace command */
1318 if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE ||
1319 cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) {
1320 switch (cmd_ctx->lsm.domain.type) {
1321 case LTTNG_DOMAIN_NONE:
1322 break;
1323 case LTTNG_DOMAIN_JUL:
1324 case LTTNG_DOMAIN_LOG4J:
1325 case LTTNG_DOMAIN_PYTHON:
1326 case LTTNG_DOMAIN_UST:
1327 if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) {
1328 ret = LTTNG_ERR_NO_USTCONSUMERD;
1329 goto error;
1330 }
1331 break;
1332 case LTTNG_DOMAIN_KERNEL:
1333 if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) {
1334 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1335 goto error;
1336 }
1337 break;
1338 default:
1339 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1340 goto error;
1341 }
1342 }
1343
1344 /*
1345 * Check that the UID matches that of the tracing session.
1346 * The root user can interact with all sessions.
1347 */
1348 if (need_tracing_session) {
1349 if (!session_access_ok(cmd_ctx->session,
1350 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) ||
1351 cmd_ctx->session->destroyed) {
1352 ret = LTTNG_ERR_EPERM;
1353 goto error;
1354 }
1355 }
1356
1357 /*
1358 * Send relayd information to consumer as soon as we have a domain and a
1359 * session defined.
1360 */
1361 if (cmd_ctx->session && need_domain) {
1362 /*
1363 * Setup relayd if not done yet. If the relayd information was already
1364 * sent to the consumer, this call will gracefully return.
1365 */
1366 ret = cmd_setup_relayd(cmd_ctx->session);
1367 if (ret != LTTNG_OK) {
1368 goto error;
1369 }
1370 }
1371
1372 /* Process by command type */
1373 switch (cmd_ctx->lsm.cmd_type) {
1374 case LTTNG_ADD_CONTEXT:
1375 {
1376 struct lttng_event_context *event_context = NULL;
1377 const enum lttng_error_code ret_code =
1378 receive_lttng_event_context(
1379 cmd_ctx, *sock, sock_error, &event_context);
1380
1381 if (ret_code != LTTNG_OK) {
1382 ret = (int) ret_code;
1383 goto error;
1384 }
1385
1386 ret = cmd_add_context(cmd_ctx, event_context, the_kernel_poll_pipe[1]);
1387 lttng_event_context_destroy(event_context);
1388 break;
1389 }
1390 case LTTNG_DISABLE_CHANNEL:
1391 {
1392 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1393 cmd_ctx->lsm.u.disable.channel_name);
1394 break;
1395 }
1396 case LTTNG_ENABLE_CHANNEL:
1397 {
1398 ret = cmd_enable_channel(
1399 cmd_ctx, *sock, the_kernel_poll_pipe[1]);
1400 break;
1401 }
1402 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE:
1403 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE:
1404 {
1405 struct lttng_dynamic_buffer payload;
1406 struct lttng_buffer_view payload_view;
1407 const bool add_value =
1408 cmd_ctx->lsm.cmd_type ==
1409 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE;
1410 const size_t name_len =
1411 cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1412 .name_len;
1413 const enum lttng_domain_type domain_type =
1414 (enum lttng_domain_type)
1415 cmd_ctx->lsm.domain.type;
1416 const enum lttng_process_attr process_attr =
1417 (enum lttng_process_attr) cmd_ctx->lsm.u
1418 .process_attr_tracker_add_remove_include_value
1419 .process_attr;
1420 const enum lttng_process_attr_value_type value_type =
1421 (enum lttng_process_attr_value_type) cmd_ctx
1422 ->lsm.u
1423 .process_attr_tracker_add_remove_include_value
1424 .value_type;
1425 struct process_attr_value *value;
1426 enum lttng_error_code ret_code;
1427 long login_name_max;
1428
1429 login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
1430 if (login_name_max < 0) {
1431 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1432 ret = LTTNG_ERR_INVALID;
1433 goto error;
1434 }
1435
1436 /* Receive remaining variable length payload if applicable. */
1437 if (name_len > login_name_max) {
1438 /*
1439 * POSIX mandates user and group names that are at least
1440 * 8 characters long. Note that although shadow-utils
1441 * (useradd, groupaadd, etc.) use 32 chars as their
1442 * limit (from bits/utmp.h, UT_NAMESIZE),
1443 * LOGIN_NAME_MAX is defined to 256.
1444 */
1445 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1446 add_value ? "addition" : "removal",
1447 name_len, login_name_max);
1448 ret = LTTNG_ERR_INVALID;
1449 goto error;
1450 }
1451
1452 lttng_dynamic_buffer_init(&payload);
1453 if (name_len != 0) {
1454 /*
1455 * Receive variable payload for user/group name
1456 * arguments.
1457 */
1458 ret = lttng_dynamic_buffer_set_size(&payload, name_len);
1459 if (ret) {
1460 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1461 add_value ? "add" : "remove");
1462 ret = LTTNG_ERR_NOMEM;
1463 goto error_add_remove_tracker_value;
1464 }
1465
1466 ret = lttcomm_recv_unix_sock(
1467 *sock, payload.data, name_len);
1468 if (ret <= 0) {
1469 ERR("Failed to receive payload of %s process attribute tracker value argument",
1470 add_value ? "add" : "remove");
1471 *sock_error = 1;
1472 ret = LTTNG_ERR_INVALID_PROTOCOL;
1473 goto error_add_remove_tracker_value;
1474 }
1475 }
1476
1477 payload_view = lttng_buffer_view_from_dynamic_buffer(
1478 &payload, 0, name_len);
1479 if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) {
1480 ret = LTTNG_ERR_INVALID_PROTOCOL;
1481 goto error_add_remove_tracker_value;
1482 }
1483
1484 /*
1485 * Validate the value type and domains are legal for the process
1486 * attribute tracker that is specified and convert the value to
1487 * add/remove to the internal sessiond representation.
1488 */
1489 ret_code = process_attr_value_from_comm(domain_type,
1490 process_attr, value_type,
1491 &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1492 .integral_value,
1493 &payload_view, &value);
1494 if (ret_code != LTTNG_OK) {
1495 ret = ret_code;
1496 goto error_add_remove_tracker_value;
1497 }
1498
1499 if (add_value) {
1500 ret = cmd_process_attr_tracker_inclusion_set_add_value(
1501 cmd_ctx->session, domain_type,
1502 process_attr, value);
1503 } else {
1504 ret = cmd_process_attr_tracker_inclusion_set_remove_value(
1505 cmd_ctx->session, domain_type,
1506 process_attr, value);
1507 }
1508 process_attr_value_destroy(value);
1509 error_add_remove_tracker_value:
1510 lttng_dynamic_buffer_reset(&payload);
1511 break;
1512 }
1513 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1514 {
1515 enum lttng_tracking_policy tracking_policy;
1516 const enum lttng_domain_type domain_type =
1517 (enum lttng_domain_type)
1518 cmd_ctx->lsm.domain.type;
1519 const enum lttng_process_attr process_attr =
1520 (enum lttng_process_attr) cmd_ctx->lsm.u
1521 .process_attr_tracker_get_tracking_policy
1522 .process_attr;
1523
1524 ret = cmd_process_attr_tracker_get_tracking_policy(
1525 cmd_ctx->session, domain_type, process_attr,
1526 &tracking_policy);
1527 if (ret != LTTNG_OK) {
1528 goto error;
1529 }
1530
1531 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1532 &(uint32_t){tracking_policy}, sizeof(uint32_t));
1533 if (ret < 0) {
1534 ret = LTTNG_ERR_NOMEM;
1535 goto error;
1536 }
1537 ret = LTTNG_OK;
1538 break;
1539 }
1540 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY:
1541 {
1542 const enum lttng_tracking_policy tracking_policy =
1543 (enum lttng_tracking_policy) cmd_ctx->lsm.u
1544 .process_attr_tracker_set_tracking_policy
1545 .tracking_policy;
1546 const enum lttng_domain_type domain_type =
1547 (enum lttng_domain_type)
1548 cmd_ctx->lsm.domain.type;
1549 const enum lttng_process_attr process_attr =
1550 (enum lttng_process_attr) cmd_ctx->lsm.u
1551 .process_attr_tracker_set_tracking_policy
1552 .process_attr;
1553
1554 ret = cmd_process_attr_tracker_set_tracking_policy(
1555 cmd_ctx->session, domain_type, process_attr,
1556 tracking_policy);
1557 if (ret != LTTNG_OK) {
1558 goto error;
1559 }
1560 break;
1561 }
1562 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1563 {
1564 struct lttng_process_attr_values *values;
1565 struct lttng_dynamic_buffer reply;
1566 const enum lttng_domain_type domain_type =
1567 (enum lttng_domain_type)
1568 cmd_ctx->lsm.domain.type;
1569 const enum lttng_process_attr process_attr =
1570 (enum lttng_process_attr) cmd_ctx->lsm.u
1571 .process_attr_tracker_get_inclusion_set
1572 .process_attr;
1573
1574 ret = cmd_process_attr_tracker_get_inclusion_set(
1575 cmd_ctx->session, domain_type, process_attr,
1576 &values);
1577 if (ret != LTTNG_OK) {
1578 goto error;
1579 }
1580
1581 lttng_dynamic_buffer_init(&reply);
1582 ret = lttng_process_attr_values_serialize(values, &reply);
1583 if (ret < 0) {
1584 goto error_tracker_get_inclusion_set;
1585 }
1586
1587 ret = setup_lttng_msg_no_cmd_header(
1588 cmd_ctx, reply.data, reply.size);
1589 if (ret < 0) {
1590 ret = LTTNG_ERR_NOMEM;
1591 goto error_tracker_get_inclusion_set;
1592 }
1593 ret = LTTNG_OK;
1594
1595 error_tracker_get_inclusion_set:
1596 lttng_process_attr_values_destroy(values);
1597 lttng_dynamic_buffer_reset(&reply);
1598 break;
1599 }
1600 case LTTNG_ENABLE_EVENT:
1601 case LTTNG_DISABLE_EVENT:
1602 {
1603 struct lttng_event *event;
1604 char *filter_expression;
1605 struct lttng_event_exclusion *exclusions;
1606 struct lttng_bytecode *bytecode;
1607 const enum lttng_error_code ret_code = receive_lttng_event(
1608 cmd_ctx, *sock, sock_error, &event,
1609 &filter_expression, &bytecode, &exclusions);
1610
1611 if (ret_code != LTTNG_OK) {
1612 ret = (int) ret_code;
1613 goto error;
1614 }
1615
1616 /*
1617 * Ownership of filter_expression, exclusions, and bytecode is
1618 * always transferred.
1619 */
1620 ret = cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT ?
1621 cmd_enable_event(cmd_ctx, event,
1622 filter_expression, exclusions,
1623 bytecode,
1624 the_kernel_poll_pipe[1]) :
1625 cmd_disable_event(cmd_ctx, event,
1626 filter_expression, bytecode,
1627 exclusions);
1628 lttng_event_destroy(event);
1629 break;
1630 }
1631 case LTTNG_LIST_TRACEPOINTS:
1632 {
1633 enum lttng_error_code ret_code;
1634 size_t original_payload_size;
1635 size_t payload_size;
1636 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1637
1638 ret = setup_empty_lttng_msg(cmd_ctx);
1639 if (ret) {
1640 ret = LTTNG_ERR_NOMEM;
1641 goto setup_error;
1642 }
1643
1644 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1645
1646 session_lock_list();
1647 ret_code = cmd_list_tracepoints(cmd_ctx->lsm.domain.type,
1648 &cmd_ctx->reply_payload);
1649 session_unlock_list();
1650 if (ret_code != LTTNG_OK) {
1651 ret = (int) ret_code;
1652 goto error;
1653 }
1654
1655 payload_size = cmd_ctx->reply_payload.buffer.size -
1656 command_header_size - original_payload_size;
1657 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1658
1659 ret = LTTNG_OK;
1660 break;
1661 }
1662 case LTTNG_LIST_TRACEPOINT_FIELDS:
1663 {
1664 enum lttng_error_code ret_code;
1665 size_t original_payload_size;
1666 size_t payload_size;
1667 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1668
1669 ret = setup_empty_lttng_msg(cmd_ctx);
1670 if (ret) {
1671 ret = LTTNG_ERR_NOMEM;
1672 goto setup_error;
1673 }
1674
1675 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1676
1677 session_lock_list();
1678 ret_code = cmd_list_tracepoint_fields(
1679 cmd_ctx->lsm.domain.type, &cmd_ctx->reply_payload);
1680 session_unlock_list();
1681 if (ret_code != LTTNG_OK) {
1682 ret = (int) ret_code;
1683 goto error;
1684 }
1685
1686 payload_size = cmd_ctx->reply_payload.buffer.size -
1687 command_header_size - original_payload_size;
1688 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1689
1690 ret = LTTNG_OK;
1691 break;
1692 }
1693 case LTTNG_LIST_SYSCALLS:
1694 {
1695 enum lttng_error_code ret_code;
1696 size_t original_payload_size;
1697 size_t payload_size;
1698 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1699
1700 ret = setup_empty_lttng_msg(cmd_ctx);
1701 if (ret) {
1702 ret = LTTNG_ERR_NOMEM;
1703 goto setup_error;
1704 }
1705
1706 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1707
1708 ret_code = cmd_list_syscalls(&cmd_ctx->reply_payload);
1709 if (ret_code != LTTNG_OK) {
1710 ret = (int) ret_code;
1711 goto error;
1712 }
1713
1714 payload_size = cmd_ctx->reply_payload.buffer.size -
1715 command_header_size - original_payload_size;
1716 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1717
1718 ret = LTTNG_OK;
1719 break;
1720 }
1721 case LTTNG_SET_CONSUMER_URI:
1722 {
1723 size_t nb_uri, len;
1724 struct lttng_uri *uris;
1725
1726 nb_uri = cmd_ctx->lsm.u.uri.size;
1727 len = nb_uri * sizeof(struct lttng_uri);
1728
1729 if (nb_uri == 0) {
1730 ret = LTTNG_ERR_INVALID;
1731 goto error;
1732 }
1733
1734 uris = zmalloc(len);
1735 if (uris == NULL) {
1736 ret = LTTNG_ERR_FATAL;
1737 goto error;
1738 }
1739
1740 /* Receive variable len data */
1741 DBG("Receiving %zu URI(s) from client ...", nb_uri);
1742 ret = lttcomm_recv_unix_sock(*sock, uris, len);
1743 if (ret <= 0) {
1744 DBG("No URIs received from client... continuing");
1745 *sock_error = 1;
1746 ret = LTTNG_ERR_SESSION_FAIL;
1747 free(uris);
1748 goto error;
1749 }
1750
1751 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
1752 free(uris);
1753 if (ret != LTTNG_OK) {
1754 goto error;
1755 }
1756
1757
1758 break;
1759 }
1760 case LTTNG_START_TRACE:
1761 {
1762 /*
1763 * On the first start, if we have a kernel session and we have
1764 * enabled time or size-based rotations, we have to make sure
1765 * the kernel tracer supports it.
1766 */
1767 if (!cmd_ctx->session->has_been_started && \
1768 cmd_ctx->session->kernel_session && \
1769 (cmd_ctx->session->rotate_timer_period || \
1770 cmd_ctx->session->rotate_size) && \
1771 !check_rotate_compatible()) {
1772 DBG("Kernel tracer version is not compatible with the rotation feature");
1773 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
1774 goto error;
1775 }
1776 ret = cmd_start_trace(cmd_ctx->session);
1777 break;
1778 }
1779 case LTTNG_STOP_TRACE:
1780 {
1781 ret = cmd_stop_trace(cmd_ctx->session);
1782 break;
1783 }
1784 case LTTNG_DESTROY_SESSION:
1785 {
1786 ret = cmd_destroy_session(cmd_ctx->session,
1787 the_notification_thread_handle, sock);
1788 break;
1789 }
1790 case LTTNG_LIST_DOMAINS:
1791 {
1792 ssize_t nb_dom;
1793 struct lttng_domain *domains = NULL;
1794
1795 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
1796 if (nb_dom < 0) {
1797 /* Return value is a negative lttng_error_code. */
1798 ret = -nb_dom;
1799 goto error;
1800 }
1801
1802 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
1803 nb_dom * sizeof(struct lttng_domain));
1804 free(domains);
1805
1806 if (ret < 0) {
1807 goto setup_error;
1808 }
1809
1810 ret = LTTNG_OK;
1811 break;
1812 }
1813 case LTTNG_LIST_CHANNELS:
1814 {
1815 enum lttng_error_code ret_code;
1816 size_t original_payload_size;
1817 size_t payload_size;
1818 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1819
1820 ret = setup_empty_lttng_msg(cmd_ctx);
1821 if (ret) {
1822 ret = LTTNG_ERR_NOMEM;
1823 goto setup_error;
1824 }
1825
1826 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1827
1828 ret_code = cmd_list_channels(cmd_ctx->lsm.domain.type,
1829 cmd_ctx->session, &cmd_ctx->reply_payload);
1830 if (ret_code != LTTNG_OK) {
1831 ret = (int) ret_code;
1832 goto error;
1833 }
1834
1835 payload_size = cmd_ctx->reply_payload.buffer.size -
1836 command_header_size - original_payload_size;
1837 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1838
1839 ret = LTTNG_OK;
1840 break;
1841 }
1842 case LTTNG_LIST_EVENTS:
1843 {
1844 enum lttng_error_code ret_code;
1845 size_t original_payload_size;
1846 size_t payload_size;
1847 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1848
1849 ret = setup_empty_lttng_msg(cmd_ctx);
1850 if (ret) {
1851 ret = LTTNG_ERR_NOMEM;
1852 goto setup_error;
1853 }
1854
1855 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1856
1857 ret_code = cmd_list_events(cmd_ctx->lsm.domain.type,
1858 cmd_ctx->session,
1859 cmd_ctx->lsm.u.list.channel_name, &cmd_ctx->reply_payload);
1860 if (ret_code != LTTNG_OK) {
1861 ret = (int) ret_code;
1862 goto error;
1863 }
1864
1865 payload_size = cmd_ctx->reply_payload.buffer.size -
1866 command_header_size - original_payload_size;
1867 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1868
1869 ret = LTTNG_OK;
1870 break;
1871 }
1872 case LTTNG_LIST_SESSIONS:
1873 {
1874 unsigned int nr_sessions;
1875 void *sessions_payload;
1876 size_t payload_len;
1877
1878 session_lock_list();
1879 nr_sessions = lttng_sessions_count(
1880 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1881 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1882
1883 payload_len = (sizeof(struct lttng_session) * nr_sessions) +
1884 (sizeof(struct lttng_session_extended) * nr_sessions);
1885 sessions_payload = zmalloc(payload_len);
1886
1887 if (!sessions_payload) {
1888 session_unlock_list();
1889 ret = -ENOMEM;
1890 goto setup_error;
1891 }
1892
1893 cmd_list_lttng_sessions(sessions_payload, nr_sessions,
1894 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1895 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1896 session_unlock_list();
1897
1898 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload,
1899 payload_len);
1900 free(sessions_payload);
1901
1902 if (ret < 0) {
1903 goto setup_error;
1904 }
1905
1906 ret = LTTNG_OK;
1907 break;
1908 }
1909 case LTTNG_REGISTER_CONSUMER:
1910 {
1911 struct consumer_data *cdata;
1912
1913 switch (cmd_ctx->lsm.domain.type) {
1914 case LTTNG_DOMAIN_KERNEL:
1915 cdata = &the_kconsumer_data;
1916 break;
1917 default:
1918 ret = LTTNG_ERR_UND;
1919 goto error;
1920 }
1921
1922 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1923 cmd_ctx->lsm.u.reg.path, cdata);
1924 break;
1925 }
1926 case LTTNG_DATA_PENDING:
1927 {
1928 int pending_ret;
1929 uint8_t pending_ret_byte;
1930
1931 pending_ret = cmd_data_pending(cmd_ctx->session);
1932
1933 /*
1934 * FIXME
1935 *
1936 * This function may returns 0 or 1 to indicate whether or not
1937 * there is data pending. In case of error, it should return an
1938 * LTTNG_ERR code. However, some code paths may still return
1939 * a nondescript error code, which we handle by returning an
1940 * "unknown" error.
1941 */
1942 if (pending_ret == 0 || pending_ret == 1) {
1943 /*
1944 * ret will be set to LTTNG_OK at the end of
1945 * this function.
1946 */
1947 } else if (pending_ret < 0) {
1948 ret = LTTNG_ERR_UNK;
1949 goto setup_error;
1950 } else {
1951 ret = pending_ret;
1952 goto setup_error;
1953 }
1954
1955 pending_ret_byte = (uint8_t) pending_ret;
1956
1957 /* 1 byte to return whether or not data is pending */
1958 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1959 &pending_ret_byte, 1);
1960
1961 if (ret < 0) {
1962 goto setup_error;
1963 }
1964
1965 ret = LTTNG_OK;
1966 break;
1967 }
1968 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1969 {
1970 uint32_t snapshot_id;
1971 struct lttcomm_lttng_output_id reply;
1972
1973 ret = cmd_snapshot_add_output(cmd_ctx->session,
1974 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output),
1975 &snapshot_id);
1976 if (ret != LTTNG_OK) {
1977 goto error;
1978 }
1979 reply.id = snapshot_id;
1980
1981 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
1982 sizeof(reply));
1983 if (ret < 0) {
1984 goto setup_error;
1985 }
1986
1987 /* Copy output list into message payload */
1988 ret = LTTNG_OK;
1989 break;
1990 }
1991 case LTTNG_SNAPSHOT_DEL_OUTPUT:
1992 {
1993 ret = cmd_snapshot_del_output(cmd_ctx->session,
1994 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output));
1995 break;
1996 }
1997 case LTTNG_SNAPSHOT_LIST_OUTPUT:
1998 {
1999 ssize_t nb_output;
2000 struct lttng_snapshot_output *outputs = NULL;
2001
2002 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
2003 if (nb_output < 0) {
2004 ret = -nb_output;
2005 goto error;
2006 }
2007
2008 assert((nb_output > 0 && outputs) || nb_output == 0);
2009 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
2010 nb_output * sizeof(struct lttng_snapshot_output));
2011 free(outputs);
2012
2013 if (ret < 0) {
2014 goto setup_error;
2015 }
2016
2017 ret = LTTNG_OK;
2018 break;
2019 }
2020 case LTTNG_SNAPSHOT_RECORD:
2021 {
2022 ret = cmd_snapshot_record(cmd_ctx->session,
2023 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_record.output),
2024 cmd_ctx->lsm.u.snapshot_record.wait);
2025 break;
2026 }
2027 case LTTNG_CREATE_SESSION_EXT:
2028 {
2029 struct lttng_dynamic_buffer payload;
2030 struct lttng_session_descriptor *return_descriptor = NULL;
2031
2032 lttng_dynamic_buffer_init(&payload);
2033 ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor);
2034 if (ret != LTTNG_OK) {
2035 goto error;
2036 }
2037
2038 ret = lttng_session_descriptor_serialize(return_descriptor,
2039 &payload);
2040 if (ret) {
2041 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2042 lttng_session_descriptor_destroy(return_descriptor);
2043 ret = LTTNG_ERR_NOMEM;
2044 goto error;
2045 }
2046 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data,
2047 payload.size);
2048 if (ret) {
2049 lttng_session_descriptor_destroy(return_descriptor);
2050 ret = LTTNG_ERR_NOMEM;
2051 goto error;
2052 }
2053 lttng_dynamic_buffer_reset(&payload);
2054 lttng_session_descriptor_destroy(return_descriptor);
2055 ret = LTTNG_OK;
2056 break;
2057 }
2058 case LTTNG_SAVE_SESSION:
2059 {
2060 ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr,
2061 &cmd_ctx->creds);
2062 break;
2063 }
2064 case LTTNG_SET_SESSION_SHM_PATH:
2065 {
2066 ret = cmd_set_session_shm_path(cmd_ctx->session,
2067 cmd_ctx->lsm.u.set_shm_path.shm_path);
2068 break;
2069 }
2070 case LTTNG_REGENERATE_METADATA:
2071 {
2072 ret = cmd_regenerate_metadata(cmd_ctx->session);
2073 break;
2074 }
2075 case LTTNG_REGENERATE_STATEDUMP:
2076 {
2077 ret = cmd_regenerate_statedump(cmd_ctx->session);
2078 break;
2079 }
2080 case LTTNG_REGISTER_TRIGGER:
2081 {
2082 struct lttng_trigger *payload_trigger;
2083 struct lttng_trigger *return_trigger;
2084 size_t original_reply_payload_size;
2085 size_t reply_payload_size;
2086 const struct lttng_credentials cmd_creds = {
2087 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2088 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2089 };
2090
2091 ret = setup_empty_lttng_msg(cmd_ctx);
2092 if (ret) {
2093 ret = LTTNG_ERR_NOMEM;
2094 goto setup_error;
2095 }
2096
2097 ret = receive_lttng_trigger(
2098 cmd_ctx, *sock, sock_error, &payload_trigger);
2099 if (ret != LTTNG_OK) {
2100 goto error;
2101 }
2102
2103 original_reply_payload_size = cmd_ctx->reply_payload.buffer.size;
2104
2105 ret = cmd_register_trigger(&cmd_creds, payload_trigger,
2106 cmd_ctx->lsm.u.trigger.is_trigger_anonymous,
2107 the_notification_thread_handle,
2108 &return_trigger);
2109 if (ret != LTTNG_OK) {
2110 lttng_trigger_put(payload_trigger);
2111 goto error;
2112 }
2113
2114 ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload);
2115 lttng_trigger_put(payload_trigger);
2116 lttng_trigger_put(return_trigger);
2117 if (ret) {
2118 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2119 ret = LTTNG_ERR_NOMEM;
2120 goto error;
2121 }
2122
2123 reply_payload_size = cmd_ctx->reply_payload.buffer.size -
2124 original_reply_payload_size;
2125
2126 update_lttng_msg(cmd_ctx, 0, reply_payload_size);
2127
2128 ret = LTTNG_OK;
2129 break;
2130 }
2131 case LTTNG_UNREGISTER_TRIGGER:
2132 {
2133 struct lttng_trigger *payload_trigger;
2134 const struct lttng_credentials cmd_creds = {
2135 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2136 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2137 };
2138
2139 ret = receive_lttng_trigger(
2140 cmd_ctx, *sock, sock_error, &payload_trigger);
2141 if (ret != LTTNG_OK) {
2142 goto error;
2143 }
2144
2145 ret = cmd_unregister_trigger(&cmd_creds, payload_trigger,
2146 the_notification_thread_handle);
2147 lttng_trigger_put(payload_trigger);
2148 break;
2149 }
2150 case LTTNG_ROTATE_SESSION:
2151 {
2152 struct lttng_rotate_session_return rotate_return;
2153
2154 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
2155
2156 memset(&rotate_return, 0, sizeof(rotate_return));
2157 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2158 DBG("Kernel tracer version is not compatible with the rotation feature");
2159 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2160 goto error;
2161 }
2162
2163 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return,
2164 false,
2165 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
2166 if (ret < 0) {
2167 ret = -ret;
2168 goto error;
2169 }
2170
2171 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
2172 sizeof(rotate_return));
2173 if (ret < 0) {
2174 ret = -ret;
2175 goto error;
2176 }
2177
2178 ret = LTTNG_OK;
2179 break;
2180 }
2181 case LTTNG_ROTATION_GET_INFO:
2182 {
2183 struct lttng_rotation_get_info_return get_info_return;
2184
2185 memset(&get_info_return, 0, sizeof(get_info_return));
2186 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
2187 cmd_ctx->lsm.u.get_rotation_info.rotation_id);
2188 if (ret < 0) {
2189 ret = -ret;
2190 goto error;
2191 }
2192
2193 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
2194 sizeof(get_info_return));
2195 if (ret < 0) {
2196 ret = -ret;
2197 goto error;
2198 }
2199
2200 ret = LTTNG_OK;
2201 break;
2202 }
2203 case LTTNG_ROTATION_SET_SCHEDULE:
2204 {
2205 bool set_schedule;
2206 enum lttng_rotation_schedule_type schedule_type;
2207 uint64_t value;
2208
2209 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2210 DBG("Kernel tracer version does not support session rotations");
2211 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2212 goto error;
2213 }
2214
2215 set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1;
2216 schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type;
2217 value = cmd_ctx->lsm.u.rotation_set_schedule.value;
2218
2219 ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule,
2220 schedule_type, value,
2221 the_notification_thread_handle);
2222 if (ret != LTTNG_OK) {
2223 goto error;
2224 }
2225
2226 break;
2227 }
2228 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
2229 {
2230 struct lttng_session_list_schedules_return schedules = {
2231 .periodic.set = !!cmd_ctx->session->rotate_timer_period,
2232 .periodic.value = cmd_ctx->session->rotate_timer_period,
2233 .size.set = !!cmd_ctx->session->rotate_size,
2234 .size.value = cmd_ctx->session->rotate_size,
2235 };
2236
2237 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
2238 sizeof(schedules));
2239 if (ret < 0) {
2240 ret = -ret;
2241 goto error;
2242 }
2243
2244 ret = LTTNG_OK;
2245 break;
2246 }
2247 case LTTNG_CLEAR_SESSION:
2248 {
2249 ret = cmd_clear_session(cmd_ctx->session, sock);
2250 break;
2251 }
2252 case LTTNG_LIST_TRIGGERS:
2253 {
2254 struct lttng_triggers *return_triggers = NULL;
2255 size_t original_payload_size;
2256 size_t payload_size;
2257
2258 ret = setup_empty_lttng_msg(cmd_ctx);
2259 if (ret) {
2260 ret = LTTNG_ERR_NOMEM;
2261 goto setup_error;
2262 }
2263
2264 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2265
2266 ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle,
2267 &return_triggers);
2268 if (ret != LTTNG_OK) {
2269 goto error;
2270 }
2271
2272 assert(return_triggers);
2273 ret = lttng_triggers_serialize(
2274 return_triggers, &cmd_ctx->reply_payload);
2275 lttng_triggers_destroy(return_triggers);
2276 if (ret) {
2277 ERR("Failed to serialize triggers in reply to `list triggers` command");
2278 ret = LTTNG_ERR_NOMEM;
2279 goto error;
2280 }
2281
2282 payload_size = cmd_ctx->reply_payload.buffer.size -
2283 original_payload_size;
2284
2285 update_lttng_msg(cmd_ctx, 0, payload_size);
2286
2287 ret = LTTNG_OK;
2288 break;
2289 }
2290 case LTTNG_EXECUTE_ERROR_QUERY:
2291 {
2292 struct lttng_error_query *query;
2293 const struct lttng_credentials cmd_creds = {
2294 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2295 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2296 };
2297 struct lttng_error_query_results *results = NULL;
2298 size_t original_payload_size;
2299 size_t payload_size;
2300
2301 ret = setup_empty_lttng_msg(cmd_ctx);
2302 if (ret) {
2303 ret = LTTNG_ERR_NOMEM;
2304 goto setup_error;
2305 }
2306
2307 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2308
2309 ret = receive_lttng_error_query(
2310 cmd_ctx, *sock, sock_error, &query);
2311 if (ret != LTTNG_OK) {
2312 goto error;
2313 }
2314
2315 ret = cmd_execute_error_query(&cmd_creds, query, &results,
2316 the_notification_thread_handle);
2317 lttng_error_query_destroy(query);
2318 if (ret != LTTNG_OK) {
2319 goto error;
2320 }
2321
2322 assert(results);
2323 ret = lttng_error_query_results_serialize(
2324 results, &cmd_ctx->reply_payload);
2325 lttng_error_query_results_destroy(results);
2326 if (ret) {
2327 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2328 ret = LTTNG_ERR_NOMEM;
2329 goto error;
2330 }
2331
2332 payload_size = cmd_ctx->reply_payload.buffer.size -
2333 original_payload_size;
2334
2335 update_lttng_msg(cmd_ctx, 0, payload_size);
2336
2337 ret = LTTNG_OK;
2338
2339 break;
2340 }
2341 default:
2342 ret = LTTNG_ERR_UND;
2343 break;
2344 }
2345
2346 error:
2347 if (cmd_ctx->reply_payload.buffer.size == 0) {
2348 DBG("Missing llm header, creating one.");
2349 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
2350 goto setup_error;
2351 }
2352 }
2353 /* Set return code */
2354 ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret;
2355 setup_error:
2356 if (cmd_ctx->session) {
2357 session_unlock(cmd_ctx->session);
2358 session_put(cmd_ctx->session);
2359 cmd_ctx->session = NULL;
2360 }
2361 if (need_tracing_session) {
2362 session_unlock_list();
2363 }
2364 init_setup_error:
2365 assert(!rcu_read_ongoing());
2366 return ret;
2367 }
2368
2369 static int create_client_sock(void)
2370 {
2371 int ret, client_sock;
2372 const mode_t old_umask = umask(0);
2373
2374 /* Create client tool unix socket */
2375 client_sock = lttcomm_create_unix_sock(
2376 the_config.client_unix_sock_path.value);
2377 if (client_sock < 0) {
2378 ERR("Create unix sock failed: %s",
2379 the_config.client_unix_sock_path.value);
2380 ret = -1;
2381 goto end;
2382 }
2383
2384 /* Set the cloexec flag */
2385 ret = utils_set_fd_cloexec(client_sock);
2386 if (ret < 0) {
2387 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2388 "Continuing but note that the consumer daemon will have a "
2389 "reference to this socket on exec()", client_sock);
2390 }
2391
2392 /* File permission MUST be 660 */
2393 ret = chmod(the_config.client_unix_sock_path.value,
2394 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2395 if (ret < 0) {
2396 ERR("Set file permissions failed: %s",
2397 the_config.client_unix_sock_path.value);
2398 PERROR("chmod");
2399 (void) lttcomm_close_unix_sock(client_sock);
2400 ret = -1;
2401 goto end;
2402 }
2403 DBG("Created client socket (fd = %i)", client_sock);
2404 ret = client_sock;
2405 end:
2406 umask(old_umask);
2407 return ret;
2408 }
2409
2410 static void cleanup_client_thread(void *data)
2411 {
2412 struct lttng_pipe *quit_pipe = data;
2413
2414 lttng_pipe_destroy(quit_pipe);
2415 }
2416
2417 static void thread_init_cleanup(void *data)
2418 {
2419 set_thread_status(false);
2420 }
2421
2422 /*
2423 * This thread manage all clients request using the unix client socket for
2424 * communication.
2425 */
2426 static void *thread_manage_clients(void *data)
2427 {
2428 int sock = -1, ret, i, pollfd, err = -1;
2429 int sock_error;
2430 uint32_t revents, nb_fd;
2431 struct lttng_poll_event events;
2432 const int client_sock = thread_state.client_sock;
2433 struct lttng_pipe *quit_pipe = data;
2434 const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe);
2435 struct command_ctx cmd_ctx = {};
2436
2437 DBG("[thread] Manage client started");
2438
2439 lttng_payload_init(&cmd_ctx.reply_payload);
2440
2441 is_root = (getuid() == 0);
2442
2443 pthread_cleanup_push(thread_init_cleanup, NULL);
2444
2445 rcu_register_thread();
2446
2447 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
2448
2449 health_code_update();
2450
2451 ret = lttcomm_listen_unix_sock(client_sock);
2452 if (ret < 0) {
2453 goto error_listen;
2454 }
2455
2456 /*
2457 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2458 * more will be added to this poll set.
2459 */
2460 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2461 if (ret < 0) {
2462 goto error_create_poll;
2463 }
2464
2465 /* Add the application registration socket */
2466 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2467 if (ret < 0) {
2468 goto error;
2469 }
2470
2471 /* Add thread quit pipe */
2472 ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR);
2473 if (ret < 0) {
2474 goto error;
2475 }
2476
2477 /* Set state as running. */
2478 set_thread_status(true);
2479 pthread_cleanup_pop(0);
2480
2481 /* This testpoint is after we signal readiness to the parent. */
2482 if (testpoint(sessiond_thread_manage_clients)) {
2483 goto error;
2484 }
2485
2486 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
2487 goto error;
2488 }
2489
2490 health_code_update();
2491
2492 while (1) {
2493 const struct cmd_completion_handler *cmd_completion_handler;
2494
2495 cmd_ctx.creds = (lttng_sock_cred) {
2496 .uid = UINT32_MAX,
2497 .gid = UINT32_MAX,
2498 };
2499 cmd_ctx.session = NULL;
2500 lttng_payload_clear(&cmd_ctx.reply_payload);
2501 cmd_ctx.lttng_msg_size = 0;
2502
2503 DBG("Accepting client command ...");
2504
2505 /* Inifinite blocking call, waiting for transmission */
2506 restart:
2507 health_poll_entry();
2508 ret = lttng_poll_wait(&events, -1);
2509 health_poll_exit();
2510 if (ret < 0) {
2511 /*
2512 * Restart interrupted system call.
2513 */
2514 if (errno == EINTR) {
2515 goto restart;
2516 }
2517 goto error;
2518 }
2519
2520 nb_fd = ret;
2521
2522 for (i = 0; i < nb_fd; i++) {
2523 revents = LTTNG_POLL_GETEV(&events, i);
2524 pollfd = LTTNG_POLL_GETFD(&events, i);
2525
2526 health_code_update();
2527
2528 if (pollfd == thread_quit_pipe_fd) {
2529 err = 0;
2530 goto exit;
2531 } else {
2532 /* Event on the registration socket */
2533 if (revents & LPOLLIN) {
2534 continue;
2535 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2536 ERR("Client socket poll error");
2537 goto error;
2538 } else {
2539 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2540 goto error;
2541 }
2542 }
2543 }
2544
2545 DBG("Wait for client response");
2546
2547 health_code_update();
2548
2549 sock = lttcomm_accept_unix_sock(client_sock);
2550 if (sock < 0) {
2551 goto error;
2552 }
2553
2554 /*
2555 * Set the CLOEXEC flag. Return code is useless because either way, the
2556 * show must go on.
2557 */
2558 (void) utils_set_fd_cloexec(sock);
2559
2560 /* Set socket option for credentials retrieval */
2561 ret = lttcomm_setsockopt_creds_unix_sock(sock);
2562 if (ret < 0) {
2563 goto error;
2564 }
2565
2566 health_code_update();
2567
2568 /*
2569 * Data is received from the lttng client. The struct
2570 * lttcomm_session_msg (lsm) contains the command and data request of
2571 * the client.
2572 */
2573 DBG("Receiving data from client ...");
2574 ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm,
2575 sizeof(struct lttcomm_session_msg), &cmd_ctx.creds);
2576 if (ret != sizeof(struct lttcomm_session_msg)) {
2577 DBG("Incomplete recv() from client... continuing");
2578 ret = close(sock);
2579 if (ret) {
2580 PERROR("close");
2581 }
2582 sock = -1;
2583 continue;
2584 }
2585
2586 health_code_update();
2587
2588 // TODO: Validate cmd_ctx including sanity check for
2589 // security purpose.
2590
2591 rcu_thread_online();
2592 /*
2593 * This function dispatch the work to the kernel or userspace tracer
2594 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2595 * informations for the client. The command context struct contains
2596 * everything this function may needs.
2597 */
2598 ret = process_client_msg(&cmd_ctx, &sock, &sock_error);
2599 rcu_thread_offline();
2600 if (ret < 0) {
2601 if (sock >= 0) {
2602 ret = close(sock);
2603 if (ret) {
2604 PERROR("close");
2605 }
2606 }
2607 sock = -1;
2608 /*
2609 * TODO: Inform client somehow of the fatal error. At
2610 * this point, ret < 0 means that a zmalloc failed
2611 * (ENOMEM). Error detected but still accept
2612 * command, unless a socket error has been
2613 * detected.
2614 */
2615 continue;
2616 }
2617
2618 if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) {
2619 WARN("Command returned an invalid status code, returning unknown error: "
2620 "command type = %s (%d), ret = %d",
2621 lttcomm_sessiond_command_str(cmd_ctx.lsm.cmd_type),
2622 cmd_ctx.lsm.cmd_type, ret);
2623 ret = LTTNG_ERR_UNK;
2624 }
2625
2626 cmd_completion_handler = cmd_pop_completion_handler();
2627 if (cmd_completion_handler) {
2628 enum lttng_error_code completion_code;
2629
2630 completion_code = cmd_completion_handler->run(
2631 cmd_completion_handler->data);
2632 if (completion_code != LTTNG_OK) {
2633 continue;
2634 }
2635 }
2636
2637 health_code_update();
2638
2639 if (sock >= 0) {
2640 struct lttng_payload_view view =
2641 lttng_payload_view_from_payload(
2642 &cmd_ctx.reply_payload,
2643 0, -1);
2644 struct lttcomm_lttng_msg *llm = (typeof(
2645 llm)) cmd_ctx.reply_payload.buffer.data;
2646
2647 assert(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm));
2648 assert(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size);
2649
2650 llm->fd_count = lttng_payload_view_get_fd_handle_count(&view);
2651
2652 DBG("Sending response (size: %d, retcode: %s (%d))",
2653 cmd_ctx.lttng_msg_size,
2654 lttng_strerror(-llm->ret_code),
2655 llm->ret_code);
2656 ret = send_unix_sock(sock, &view);
2657 if (ret < 0) {
2658 ERR("Failed to send data back to client");
2659 }
2660
2661 /* End of transmission */
2662 ret = close(sock);
2663 if (ret) {
2664 PERROR("close");
2665 }
2666 }
2667 sock = -1;
2668
2669 health_code_update();
2670 }
2671
2672 exit:
2673 error:
2674 if (sock >= 0) {
2675 ret = close(sock);
2676 if (ret) {
2677 PERROR("close");
2678 }
2679 }
2680
2681 lttng_poll_clean(&events);
2682
2683 error_listen:
2684 error_create_poll:
2685 unlink(the_config.client_unix_sock_path.value);
2686 ret = close(client_sock);
2687 if (ret) {
2688 PERROR("close");
2689 }
2690
2691 if (err) {
2692 health_error();
2693 ERR("Health error occurred in %s", __func__);
2694 }
2695
2696 health_unregister(the_health_sessiond);
2697
2698 DBG("Client thread dying");
2699 lttng_payload_reset(&cmd_ctx.reply_payload);
2700 rcu_unregister_thread();
2701 return NULL;
2702 }
2703
2704 static
2705 bool shutdown_client_thread(void *thread_data)
2706 {
2707 struct lttng_pipe *client_quit_pipe = thread_data;
2708 const int write_fd = lttng_pipe_get_writefd(client_quit_pipe);
2709
2710 return notify_thread_pipe(write_fd) == 1;
2711 }
2712
2713 struct lttng_thread *launch_client_thread(void)
2714 {
2715 bool thread_running;
2716 struct lttng_pipe *client_quit_pipe;
2717 struct lttng_thread *thread = NULL;
2718 int client_sock_fd = -1;
2719
2720 sem_init(&thread_state.ready, 0, 0);
2721 client_quit_pipe = lttng_pipe_open(FD_CLOEXEC);
2722 if (!client_quit_pipe) {
2723 goto error;
2724 }
2725
2726 client_sock_fd = create_client_sock();
2727 if (client_sock_fd < 0) {
2728 goto error;
2729 }
2730
2731 thread_state.client_sock = client_sock_fd;
2732 thread = lttng_thread_create("Client management",
2733 thread_manage_clients,
2734 shutdown_client_thread,
2735 cleanup_client_thread,
2736 client_quit_pipe);
2737 if (!thread) {
2738 goto error;
2739 }
2740 /* The client thread now owns the client sock fd and the quit pipe. */
2741 client_sock_fd = -1;
2742 client_quit_pipe = NULL;
2743
2744 /*
2745 * This thread is part of the threads that need to be fully
2746 * initialized before the session daemon is marked as "ready".
2747 */
2748 thread_running = wait_thread_status();
2749 if (!thread_running) {
2750 goto error;
2751 }
2752 return thread;
2753 error:
2754 if (client_sock_fd >= 0) {
2755 if (close(client_sock_fd)) {
2756 PERROR("Failed to close client socket");
2757 }
2758 }
2759 lttng_thread_put(thread);
2760 cleanup_client_thread(client_quit_pipe);
2761 return NULL;
2762 }
LTTng 2.0 tools and control repository
This page took 0.113667 seconds and 3 git commands to generate.