Fix kconsumerd multiple spawn bug
[lttng-tools.git] / ltt-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/ipc.h>
31 #include <sys/shm.h>
32 #include <sys/socket.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35 #include <unistd.h>
36
37 #include <urcu/list.h> /* URCU list library (-lurcu) */
38 #include <ust/ustctl.h> /* UST control lib (-lust) */
39 #include <lttng/lttng.h>
40
41 #include "liblttsessiondcomm.h"
42 #include "ltt-sessiond.h"
43 #include "lttngerr.h"
44 #include "kernel-ctl.h"
45 #include "ust-ctl.h"
46 #include "session.h"
47 #include "traceable-app.h"
48 #include "lttng-kconsumerd.h"
49
50 /*
51 * TODO:
52 * teardown: signal SIGTERM handler -> write into pipe. Threads waits
53 * with epoll on pipe and on other pipes/sockets for commands. Main
54 * simply waits on pthread join.
55 */
56
57 /* Const values */
58 const char default_home_dir[] = DEFAULT_HOME_DIR;
59 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
60 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
61 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
62
63 /* Variables */
64 int opt_verbose; /* Not static for lttngerr.h */
65 int opt_quiet; /* Not static for lttngerr.h */
66 const char *progname;
67 const char *opt_tracing_group;
68 static int opt_sig_parent;
69 static int opt_daemon;
70 static int is_root; /* Set to 1 if the daemon is running as root */
71 static pid_t ppid; /* Parent PID for --sig-parent option */
72 static pid_t kconsumerd_pid;
73
74 static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
75 static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
76 static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
77 static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
78
79 /* Sockets and FDs */
80 static int client_sock;
81 static int apps_sock;
82 static int kconsumerd_err_sock;
83 static int kconsumerd_cmd_sock;
84 static int kernel_tracer_fd;
85
86 /* Pthread, Mutexes and Semaphores */
87 static pthread_t kconsumerd_thread;
88 static pthread_t apps_thread;
89 static pthread_t client_thread;
90 static sem_t kconsumerd_sem;
91
92 static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
93
94 /*
95 * teardown_kernel_session
96 *
97 * Complete teardown of a kernel session. This free all data structure
98 * related to a kernel session and update counter.
99 */
100 static void teardown_kernel_session(struct ltt_session *session)
101 {
102 if (session->kernel_session != NULL) {
103 DBG("Tearing down kernel session");
104 trace_destroy_kernel_session(session->kernel_session);
105 /* Extra precaution */
106 session->kernel_session = NULL;
107 /* Decrement session count */
108 session->kern_session_count--;
109 }
110 }
111
112 /*
113 * cleanup
114 *
115 * Cleanup the daemon on exit
116 */
117 static void cleanup()
118 {
119 int ret;
120 char *cmd;
121 struct ltt_session *sess;
122
123 DBG("Cleaning up");
124
125 /* <fun> */
126 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
127 MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0);
128 /* </fun> */
129
130 /* Stopping all threads */
131 DBG("Terminating all threads");
132 pthread_cancel(client_thread);
133 pthread_cancel(apps_thread);
134 if (kconsumerd_pid != 0) {
135 pthread_cancel(kconsumerd_thread);
136 }
137
138 DBG("Unlinking all unix socket");
139 unlink(client_unix_sock_path);
140 unlink(apps_unix_sock_path);
141 unlink(kconsumerd_err_unix_sock_path);
142
143 DBG("Removing %s directory", LTTNG_RUNDIR);
144 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
145 if (ret < 0) {
146 ERR("asprintf failed. Something is really wrong!");
147 }
148
149 /* Remove lttng run directory */
150 ret = system(cmd);
151 if (ret < 0) {
152 ERR("Unable to clean " LTTNG_RUNDIR);
153 }
154
155 DBG("Cleaning up all session");
156 /* Cleanup ALL session */
157 cds_list_for_each_entry(sess, &ltt_session_list.head, list) {
158 teardown_kernel_session(sess);
159 // TODO complete session cleanup (including UST)
160 }
161
162 close(kernel_tracer_fd);
163 }
164
165 /*
166 * send_unix_sock
167 *
168 * Send data on a unix socket using the liblttsessiondcomm API.
169 *
170 * Return lttcomm error code.
171 */
172 static int send_unix_sock(int sock, void *buf, size_t len)
173 {
174 /* Check valid length */
175 if (len <= 0) {
176 return -1;
177 }
178
179 return lttcomm_send_unix_sock(sock, buf, len);
180 }
181
182 /*
183 * clean_command_ctx
184 *
185 * Free memory of a command context structure.
186 */
187 static void clean_command_ctx(struct command_ctx *cmd_ctx)
188 {
189 DBG("Clean command context structure %p", cmd_ctx);
190 if (cmd_ctx) {
191 if (cmd_ctx->llm) {
192 free(cmd_ctx->llm);
193 }
194 if (cmd_ctx->lsm) {
195 free(cmd_ctx->lsm);
196 }
197 free(cmd_ctx);
198 cmd_ctx = NULL;
199 }
200 }
201
202 /*
203 * ust_connect_app
204 *
205 * Return a socket connected to the libust communication socket
206 * of the application identified by the pid.
207 *
208 * If the pid is not found in the traceable list,
209 * return -1 to indicate error.
210 */
211 static int ust_connect_app(pid_t pid)
212 {
213 int sock;
214 struct ltt_traceable_app *lta;
215
216 DBG("Connect to application pid %d", pid);
217
218 lta = find_app_by_pid(pid);
219 if (lta == NULL) {
220 /* App not found */
221 DBG("Application pid %d not found", pid);
222 return -1;
223 }
224
225 sock = ustctl_connect_pid(lta->pid);
226 if (sock < 0) {
227 ERR("Fail connecting to the PID %d\n", pid);
228 }
229
230 return sock;
231 }
232
233 /*
234 * notify_apps
235 *
236 * Notify apps by writing 42 to a named pipe using name.
237 * Every applications waiting for a ltt-sessiond will be notified
238 * and re-register automatically to the session daemon.
239 *
240 * Return open or write error value.
241 */
242 static int notify_apps(const char *name)
243 {
244 int fd;
245 int ret = -1;
246
247 DBG("Notify the global application pipe");
248
249 /* Try opening the global pipe */
250 fd = open(name, O_WRONLY);
251 if (fd < 0) {
252 goto error;
253 }
254
255 /* Notify by writing on the pipe */
256 ret = write(fd, "42", 2);
257 if (ret < 0) {
258 perror("write");
259 }
260
261 error:
262 return ret;
263 }
264
265 /*
266 * setup_lttng_msg
267 *
268 * Setup the outgoing data buffer for the response (llm) by allocating the
269 * right amount of memory and copying the original information from the lsm
270 * structure.
271 *
272 * Return total size of the buffer pointed by buf.
273 */
274 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
275 {
276 int ret, buf_size, trace_name_size;
277
278 /*
279 * Check for the trace_name. If defined, it's part of the payload data of
280 * the llm structure.
281 */
282 trace_name_size = strlen(cmd_ctx->lsm->trace_name);
283 buf_size = trace_name_size + size;
284
285 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
286 if (cmd_ctx->llm == NULL) {
287 perror("malloc");
288 ret = -ENOMEM;
289 goto error;
290 }
291
292 /* Copy common data */
293 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
294 cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
295 if (!uuid_is_null(cmd_ctx->lsm->session_uuid)) {
296 uuid_copy(cmd_ctx->llm->session_uuid, cmd_ctx->lsm->session_uuid);
297 }
298
299 cmd_ctx->llm->trace_name_offset = trace_name_size;
300 cmd_ctx->llm->data_size = size;
301 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
302
303 /* Copy trace name to the llm structure. Begining of the payload. */
304 memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size);
305
306 return buf_size;
307
308 error:
309 return ret;
310 }
311
312 /*
313 * thread_manage_kconsumerd
314 *
315 * This thread manage the kconsumerd error sent
316 * back to the session daemon.
317 */
318 static void *thread_manage_kconsumerd(void *data)
319 {
320 int sock, ret;
321 enum lttcomm_return_code code;
322
323 DBG("[thread] Manage kconsumerd started");
324
325 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
326 if (ret < 0) {
327 goto error;
328 }
329
330 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
331 if (sock < 0) {
332 goto error;
333 }
334
335 /* Getting status code from kconsumerd */
336 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
337 if (ret <= 0) {
338 goto error;
339 }
340
341 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
342 kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
343 if (kconsumerd_cmd_sock < 0) {
344 sem_post(&kconsumerd_sem);
345 perror("kconsumerd connect");
346 goto error;
347 }
348 /* Signal condition to tell that the kconsumerd is ready */
349 sem_post(&kconsumerd_sem);
350 DBG("Kconsumerd command socket ready");
351 } else {
352 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
353 lttcomm_get_readable_code(-code));
354 goto error;
355 }
356
357 /* Wait for any kconsumerd error */
358 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
359 if (ret <= 0) {
360 ERR("Kconsumerd closed the command socket");
361 goto error;
362 }
363
364 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
365
366 error:
367 kconsumerd_pid = 0;
368 DBG("Kconsumerd thread dying");
369 return NULL;
370 }
371
372 /*
373 * thread_manage_apps
374 *
375 * This thread manage the application socket communication
376 */
377 static void *thread_manage_apps(void *data)
378 {
379 int sock, ret;
380
381 /* TODO: Something more elegant is needed but fine for now */
382 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
383 * for 32-bit vs 64-bit compat processes. */
384 /* replicate in ust with version number */
385 struct {
386 int reg; /* 1:register, 0:unregister */
387 pid_t pid;
388 uid_t uid;
389 } reg_msg;
390
391 DBG("[thread] Manage apps started");
392
393 ret = lttcomm_listen_unix_sock(apps_sock);
394 if (ret < 0) {
395 goto error;
396 }
397
398 /* Notify all applications to register */
399 notify_apps(default_global_apps_pipe);
400
401 while (1) {
402 DBG("Accepting application registration");
403 /* Blocking call, waiting for transmission */
404 sock = lttcomm_accept_unix_sock(apps_sock);
405 if (sock < 0) {
406 goto error;
407 }
408
409 /* Basic recv here to handle the very simple data
410 * that the libust send to register (reg_msg).
411 */
412 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
413 if (ret < 0) {
414 perror("recv");
415 continue;
416 }
417
418 /* Add application to the global traceable list */
419 if (reg_msg.reg == 1) {
420 /* Registering */
421 ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
422 if (ret < 0) {
423 /* register_traceable_app only return an error with
424 * ENOMEM. At this point, we better stop everything.
425 */
426 goto error;
427 }
428 } else {
429 /* Unregistering */
430 unregister_traceable_app(reg_msg.pid);
431 }
432 }
433
434 error:
435
436 return NULL;
437 }
438
439 /*
440 * spawn_kconsumerd_thread
441 *
442 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
443 * exec or it will fails.
444 */
445 static int spawn_kconsumerd_thread(void)
446 {
447 int ret;
448
449 /* Setup semaphore */
450 sem_init(&kconsumerd_sem, 0, 0);
451
452 ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
453 if (ret != 0) {
454 perror("pthread_create kconsumerd");
455 goto error;
456 }
457
458 /* Wait for the kconsumerd thread to be ready */
459 sem_wait(&kconsumerd_sem);
460
461 if (kconsumerd_pid == 0) {
462 ERR("Kconsumerd did not start");
463 goto error;
464 }
465
466 return 0;
467
468 error:
469 ret = LTTCOMM_KERN_CONSUMER_FAIL;
470 return ret;
471 }
472
473 /*
474 * spawn_kconsumerd
475 *
476 * Fork and exec a kernel consumer daemon (kconsumerd).
477 *
478 * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel
479 * file descriptor using the libkernelctl or kernel-ctl functions. So, a
480 * kernel consumer MUST only be spawned before creating a kernel session.
481 *
482 * Return pid if successful else -1.
483 */
484 static pid_t spawn_kconsumerd(void)
485 {
486 int ret;
487 pid_t pid;
488
489 DBG("Spawning kconsumerd");
490
491 pid = fork();
492 if (pid == 0) {
493 /*
494 * Exec kconsumerd.
495 */
496 execlp("kconsumerd", "kconsumerd", "--quiet", NULL);
497 if (errno != 0) {
498 perror("kernel start consumer exec");
499 }
500 exit(EXIT_FAILURE);
501 } else if (pid > 0) {
502 ret = pid;
503 goto error;
504 } else {
505 perror("kernel start consumer fork");
506 ret = -errno;
507 goto error;
508 }
509
510 error:
511 return ret;
512 }
513
514 /*
515 * start_kconsumerd
516 *
517 * Spawn the kconsumerd daemon and session daemon thread.
518 */
519 static int start_kconsumerd(void)
520 {
521 int ret;
522
523 pthread_mutex_lock(&kconsumerd_pid_mutex);
524 if (kconsumerd_pid != 0) {
525 goto end;
526 }
527
528 ret = spawn_kconsumerd();
529 if (ret < 0) {
530 ERR("Spawning kconsumerd failed");
531 ret = LTTCOMM_KERN_CONSUMER_FAIL;
532 pthread_mutex_unlock(&kconsumerd_pid_mutex);
533 goto error;
534 }
535
536 /* Setting up the global kconsumerd_pid */
537 kconsumerd_pid = ret;
538 pthread_mutex_unlock(&kconsumerd_pid_mutex);
539
540 DBG("Kconsumerd pid %d", ret);
541
542 DBG("Spawning kconsumerd thread");
543 ret = spawn_kconsumerd_thread();
544 if (ret < 0) {
545 ERR("Fatal error spawning kconsumerd thread");
546 goto error;
547 }
548
549 end:
550 pthread_mutex_unlock(&kconsumerd_pid_mutex);
551 return 0;
552
553 error:
554 return ret;
555 }
556
557 /*
558 * send_kconsumerd_fds
559 *
560 * Send all stream fds of the kernel session to the consumer.
561 */
562 static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
563 {
564 int ret, i = 0;
565 /* Plus one here for the metadata fd */
566 size_t nb_fd = session->stream_count_global + 1;
567 int fds[nb_fd];
568 struct ltt_kernel_stream *stream;
569 struct ltt_kernel_channel *chan;
570 struct lttcomm_kconsumerd_header lkh;
571 struct lttcomm_kconsumerd_msg buf[nb_fd];
572
573 /* Add metadata data */
574 fds[i] = session->metadata_stream_fd;
575 buf[i].fd = fds[i];
576 buf[i].state = ACTIVE_FD;
577 buf[i].max_sb_size = session->metadata->conf->subbuf_size;
578 strncpy(buf[i].path_name, session->metadata->pathname, PATH_MAX);
579
580 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
581 cds_list_for_each_entry(stream, &chan->stream_list.head, list) {
582 i++;
583 fds[i] = stream->fd;
584 buf[i].fd = stream->fd;
585 buf[i].state = stream->state;
586 buf[i].max_sb_size = chan->channel->subbuf_size;
587 strncpy(buf[i].path_name, stream->pathname, PATH_MAX);
588 }
589 }
590
591 /* Setup header */
592 lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg);
593 lkh.cmd_type = ADD_STREAM;
594
595 DBG("Sending kconsumerd header");
596
597 ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
598 if (ret < 0) {
599 perror("send kconsumerd header");
600 goto error;
601 }
602
603 DBG("Sending all fds to kconsumerd");
604
605 ret = lttcomm_send_fds_unix_sock(sock, buf, fds, nb_fd, lkh.payload_size);
606 if (ret < 0) {
607 perror("send kconsumerd fds");
608 goto error;
609 }
610
611 DBG("Kconsumerd fds sent");
612
613 return 0;
614
615 error:
616 return ret;
617 }
618
619 /*
620 * create_trace_dir
621 *
622 * Create the trace output directory.
623 */
624 static int create_trace_dir(struct ltt_kernel_session *session)
625 {
626 int ret;
627 struct ltt_kernel_channel *chan;
628
629 /* Create all channel directories */
630 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
631 DBG("Creating trace directory at %s", chan->pathname);
632 ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG );
633 if (ret < 0) {
634 perror("mkdir trace path");
635 ret = -errno;
636 goto error;
637 }
638 }
639
640 return 0;
641
642 error:
643 return ret;
644 }
645
646 /*
647 * process_client_msg
648 *
649 * Process the command requested by the lttng client within the command
650 * context structure. This function make sure that the return structure (llm)
651 * is set and ready for transmission before returning.
652 *
653 * Return any error encountered or 0 for success.
654 */
655 static int process_client_msg(struct command_ctx *cmd_ctx)
656 {
657 int ret;
658
659 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
660
661 /* Check command that needs a session */
662 switch (cmd_ctx->lsm->cmd_type) {
663 case LTTNG_CREATE_SESSION:
664 case LTTNG_LIST_SESSIONS:
665 case KERNEL_LIST_EVENTS:
666 case UST_LIST_APPS:
667 break;
668 default:
669 cmd_ctx->session = find_session_by_uuid(cmd_ctx->lsm->session_uuid);
670 if (cmd_ctx->session == NULL) {
671 ret = LTTCOMM_SELECT_SESS;
672 goto error;
673 }
674 break;
675 }
676
677 /* Check command for kernel tracing */
678 switch (cmd_ctx->lsm->cmd_type) {
679 case KERNEL_CREATE_SESSION:
680 case KERNEL_CREATE_CHANNEL:
681 case KERNEL_CREATE_STREAM:
682 case KERNEL_DISABLE_EVENT:
683 case KERNEL_ENABLE_EVENT:
684 case KERNEL_LIST_EVENTS:
685 case KERNEL_OPEN_METADATA:
686 case KERNEL_START_TRACE:
687 case KERNEL_STOP_TRACE:
688 /* TODO: reconnect to kernel tracer to check if
689 * it's loadded */
690 if (kernel_tracer_fd == 0) {
691 ret = LTTCOMM_KERN_NA;
692 goto error;
693 }
694 break;
695 }
696
697 /* Connect to ust apps if available pid */
698 if (cmd_ctx->lsm->pid > 0) {
699 /* Connect to app using ustctl API */
700 cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
701 if (cmd_ctx->ust_sock < 0) {
702 ret = LTTCOMM_NO_TRACEABLE;
703 goto error;
704 }
705 }
706
707 /* Process by command type */
708 switch (cmd_ctx->lsm->cmd_type) {
709 case KERNEL_CREATE_SESSION:
710 {
711 ret = setup_lttng_msg(cmd_ctx, 0);
712 if (ret < 0) {
713 goto setup_error;
714 }
715
716 ret = start_kconsumerd();
717 if (ret < 0) {
718 goto error;
719 }
720
721 DBG("Creating kernel session");
722
723 ret = kernel_create_session(cmd_ctx->session, kernel_tracer_fd);
724 if (ret < 0) {
725 ret = LTTCOMM_KERN_SESS_FAIL;
726 goto error;
727 }
728
729 ret = LTTCOMM_OK;
730 break;
731 }
732 case KERNEL_CREATE_CHANNEL:
733 {
734 ret = setup_lttng_msg(cmd_ctx, 0);
735 if (ret < 0) {
736 goto setup_error;
737 }
738
739 DBG("Creating kernel channel");
740
741 ret = kernel_create_channel(cmd_ctx->session->kernel_session);
742
743 if (ret < 0) {
744 ret = LTTCOMM_KERN_CHAN_FAIL;
745 goto error;
746 }
747
748 ret = LTTCOMM_OK;
749 break;
750 }
751 case KERNEL_ENABLE_EVENT:
752 {
753 /* Setup lttng message with no payload */
754 ret = setup_lttng_msg(cmd_ctx, 0);
755 if (ret < 0) {
756 goto setup_error;
757 }
758
759 DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name);
760
761 ret = kernel_enable_event(cmd_ctx->session->kernel_session, cmd_ctx->lsm->u.event.event_name);
762 if (ret < 0) {
763 ret = LTTCOMM_KERN_ENABLE_FAIL;
764 goto error;
765 }
766
767 ret = LTTCOMM_OK;
768 break;
769 }
770 case KERNEL_LIST_EVENTS:
771 {
772 char *event_list;
773 ssize_t size;
774
775 size = kernel_list_events(kernel_tracer_fd, &event_list);
776 if (size < 0) {
777 ret = LTTCOMM_KERN_LIST_FAIL;
778 goto error;
779 }
780
781 /*
782 * Setup lttng message with payload size set to the event list size in
783 * bytes and then copy list into the llm payload.
784 */
785 ret = setup_lttng_msg(cmd_ctx, size);
786 if (ret < 0) {
787 goto setup_error;
788 }
789
790 /* Copy event list into message payload */
791 memcpy(cmd_ctx->llm->payload, event_list, size);
792
793 free(event_list);
794
795 ret = LTTCOMM_OK;
796 break;
797 }
798 case KERNEL_OPEN_METADATA:
799 {
800 /* Setup lttng message with no payload */
801 ret = setup_lttng_msg(cmd_ctx, 0);
802 if (ret < 0) {
803 goto setup_error;
804 }
805
806 DBG("Open kernel metadata");
807
808 ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
809 if (ret < 0) {
810 ret = LTTCOMM_KERN_META_FAIL;
811 goto error;
812 }
813
814 ret = LTTCOMM_OK;
815 break;
816 }
817 case KERNEL_CREATE_STREAM:
818 {
819 struct ltt_kernel_channel *chan;
820 /* Setup lttng message with no payload */
821 ret = setup_lttng_msg(cmd_ctx, 0);
822 if (ret < 0) {
823 goto setup_error;
824 }
825
826 DBG("Creating kernel stream");
827
828 ret = kernel_create_metadata_stream(cmd_ctx->session->kernel_session);
829 if (ret < 0) {
830 ERR("Kernel create metadata stream failed");
831 ret = LTTCOMM_KERN_STREAM_FAIL;
832 goto error;
833 }
834
835 /* For each channel */
836 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
837 ret = kernel_create_channel_stream(chan);
838 if (ret < 0) {
839 ERR("Kernel create channel stream failed");
840 ret = LTTCOMM_KERN_STREAM_FAIL;
841 goto error;
842 }
843 /* Update the stream global counter */
844 cmd_ctx->session->kernel_session->stream_count_global += ret;
845 }
846
847 ret = LTTCOMM_OK;
848 break;
849 }
850 case KERNEL_START_TRACE:
851 {
852 /* Setup lttng message with no payload */
853 ret = setup_lttng_msg(cmd_ctx, 0);
854 if (ret < 0) {
855 goto setup_error;
856 }
857
858 DBG("Start kernel tracing");
859
860 ret = create_trace_dir(cmd_ctx->session->kernel_session);
861 if (ret < 0) {
862 if (ret == -EEXIST) {
863 ret = LTTCOMM_KERN_DIR_EXIST;
864 } else {
865 ret = LTTCOMM_KERN_DIR_FAIL;
866 goto error;
867 }
868 }
869
870 ret = kernel_start_session(cmd_ctx->session->kernel_session);
871 if (ret < 0) {
872 ERR("Kernel start session failed");
873 ret = LTTCOMM_KERN_START_FAIL;
874 goto error;
875 }
876
877 ret = send_kconsumerd_fds(kconsumerd_cmd_sock, cmd_ctx->session->kernel_session);
878 if (ret < 0) {
879 ERR("Send kconsumerd fds failed");
880 ret = LTTCOMM_KERN_CONSUMER_FAIL;
881 goto error;
882 }
883
884 ret = LTTCOMM_OK;
885 break;
886 }
887 case KERNEL_STOP_TRACE:
888 {
889 /* Setup lttng message with no payload */
890 ret = setup_lttng_msg(cmd_ctx, 0);
891 if (ret < 0) {
892 goto setup_error;
893 }
894
895 if (cmd_ctx->session->kernel_session == NULL) {
896 ret = LTTCOMM_KERN_NO_SESSION;
897 goto error;
898 }
899
900 DBG("Stop kernel tracing");
901
902 ret = kernel_stop_session(cmd_ctx->session->kernel_session);
903 if (ret < 0) {
904 ERR("Kernel stop session failed");
905 ret = LTTCOMM_KERN_STOP_FAIL;
906 goto error;
907 }
908
909 /* Clean kernel session teardown */
910 teardown_kernel_session(cmd_ctx->session);
911
912 ret = LTTCOMM_OK;
913 break;
914 }
915 case LTTNG_CREATE_SESSION:
916 {
917 /* Setup lttng message with no payload */
918 ret = setup_lttng_msg(cmd_ctx, 0);
919 if (ret < 0) {
920 goto setup_error;
921 }
922
923 ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid);
924 if (ret < 0) {
925 if (ret == -1) {
926 ret = LTTCOMM_EXIST_SESS;
927 } else {
928 ret = LTTCOMM_FATAL;
929 }
930 goto error;
931 }
932
933 ret = LTTCOMM_OK;
934 break;
935 }
936 case LTTNG_DESTROY_SESSION:
937 {
938 /* Setup lttng message with no payload */
939 ret = setup_lttng_msg(cmd_ctx, 0);
940 if (ret < 0) {
941 goto setup_error;
942 }
943
944 ret = destroy_session(&cmd_ctx->lsm->session_uuid);
945 if (ret < 0) {
946 ret = LTTCOMM_NO_SESS;
947 goto error;
948 }
949
950 ret = LTTCOMM_OK;
951 break;
952 }
953 case LTTNG_LIST_TRACES:
954 {
955 unsigned int trace_count;
956
957 trace_count = get_trace_count_per_session(cmd_ctx->session);
958 if (trace_count == 0) {
959 ret = LTTCOMM_NO_TRACE;
960 goto error;
961 }
962
963 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
964 if (ret < 0) {
965 goto setup_error;
966 }
967
968 get_traces_per_session(cmd_ctx->session,
969 (struct lttng_trace *)(cmd_ctx->llm->payload));
970
971 ret = LTTCOMM_OK;
972 break;
973 }
974 case UST_CREATE_TRACE:
975 {
976 /* Setup lttng message with no payload */
977 ret = setup_lttng_msg(cmd_ctx, 0);
978 if (ret < 0) {
979 goto setup_error;
980 }
981
982 ret = ust_create_trace(cmd_ctx);
983 if (ret < 0) {
984 goto setup_error;
985 }
986 break;
987 }
988 case UST_LIST_APPS:
989 {
990 unsigned int app_count;
991
992 app_count = get_app_count();
993 DBG("Traceable application count : %d", app_count);
994 if (app_count == 0) {
995 ret = LTTCOMM_NO_APPS;
996 goto error;
997 }
998
999 ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
1000 if (ret < 0) {
1001 goto setup_error;
1002 }
1003
1004 get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
1005
1006 ret = LTTCOMM_OK;
1007 break;
1008 }
1009 case UST_START_TRACE:
1010 {
1011 /* Setup lttng message with no payload */
1012 ret = setup_lttng_msg(cmd_ctx, 0);
1013 if (ret < 0) {
1014 goto setup_error;
1015 }
1016
1017 ret = ust_start_trace(cmd_ctx);
1018 if (ret < 0) {
1019 goto setup_error;
1020 }
1021 break;
1022 }
1023 case UST_STOP_TRACE:
1024 {
1025 /* Setup lttng message with no payload */
1026 ret = setup_lttng_msg(cmd_ctx, 0);
1027 if (ret < 0) {
1028 goto setup_error;
1029 }
1030
1031 ret = ust_stop_trace(cmd_ctx);
1032 if (ret < 0) {
1033 goto setup_error;
1034 }
1035 break;
1036 }
1037 case LTTNG_LIST_SESSIONS:
1038 {
1039 unsigned int session_count;
1040
1041 session_count = get_session_count();
1042 if (session_count == 0) {
1043 ret = LTTCOMM_NO_SESS;
1044 goto error;
1045 }
1046
1047 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count);
1048 if (ret < 0) {
1049 goto setup_error;
1050 }
1051
1052 get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload));
1053
1054 ret = LTTCOMM_OK;
1055 break;
1056 }
1057 default:
1058 /* Undefined command */
1059 ret = setup_lttng_msg(cmd_ctx, 0);
1060 if (ret < 0) {
1061 goto setup_error;
1062 }
1063
1064 ret = LTTCOMM_UND;
1065 break;
1066 }
1067
1068 /* Set return code */
1069 cmd_ctx->llm->ret_code = ret;
1070
1071 return ret;
1072
1073 error:
1074 if (cmd_ctx->llm == NULL) {
1075 DBG("Missing llm structure. Allocating one.");
1076 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
1077 goto setup_error;
1078 }
1079 }
1080 /* Notify client of error */
1081 cmd_ctx->llm->ret_code = ret;
1082
1083 setup_error:
1084 return ret;
1085 }
1086
1087 /*
1088 * thread_manage_clients
1089 *
1090 * This thread manage all clients request using the unix
1091 * client socket for communication.
1092 */
1093 static void *thread_manage_clients(void *data)
1094 {
1095 int sock, ret;
1096 struct command_ctx *cmd_ctx;
1097
1098 DBG("[thread] Manage client started");
1099
1100 ret = lttcomm_listen_unix_sock(client_sock);
1101 if (ret < 0) {
1102 goto error;
1103 }
1104
1105 /* Notify parent pid that we are ready
1106 * to accept command for client side.
1107 */
1108 if (opt_sig_parent) {
1109 kill(ppid, SIGCHLD);
1110 }
1111
1112 while (1) {
1113 /* Blocking call, waiting for transmission */
1114 DBG("Accepting client command ...");
1115 sock = lttcomm_accept_unix_sock(client_sock);
1116 if (sock < 0) {
1117 goto error;
1118 }
1119
1120 /* Allocate context command to process the client request */
1121 cmd_ctx = malloc(sizeof(struct command_ctx));
1122
1123 /* Allocate data buffer for reception */
1124 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
1125 cmd_ctx->llm = NULL;
1126 cmd_ctx->session = NULL;
1127
1128 /*
1129 * Data is received from the lttng client. The struct
1130 * lttcomm_session_msg (lsm) contains the command and data request of
1131 * the client.
1132 */
1133 DBG("Receiving data from client ...");
1134 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
1135 if (ret <= 0) {
1136 continue;
1137 }
1138
1139 /*
1140 * This function dispatch the work to the kernel or userspace tracer
1141 * libs and fill the lttcomm_lttng_msg data structure of all the needed
1142 * informations for the client. The command context struct contains
1143 * everything this function may needs.
1144 */
1145 ret = process_client_msg(cmd_ctx);
1146 if (ret < 0) {
1147 /* TODO: Inform client somehow of the fatal error. At this point,
1148 * ret < 0 means that a malloc failed (ENOMEM). */
1149 /* Error detected but still accept command */
1150 clean_command_ctx(cmd_ctx);
1151 continue;
1152 }
1153
1154 DBG("Sending response (size: %d, retcode: %d)",
1155 cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
1156 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
1157 if (ret < 0) {
1158 ERR("Failed to send data back to client");
1159 }
1160
1161 clean_command_ctx(cmd_ctx);
1162 }
1163
1164 error:
1165 return NULL;
1166 }
1167
1168
1169 /*
1170 * usage function on stderr
1171 */
1172 static void usage(void)
1173 {
1174 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
1175 fprintf(stderr, " -h, --help Display this usage.\n");
1176 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
1177 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
1178 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
1179 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
1180 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
1181 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
1182 fprintf(stderr, " -V, --version Show version number.\n");
1183 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
1184 fprintf(stderr, " -q, --quiet No output at all.\n");
1185 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
1186 }
1187
1188 /*
1189 * daemon argument parsing
1190 */
1191 static int parse_args(int argc, char **argv)
1192 {
1193 int c;
1194
1195 static struct option long_options[] = {
1196 { "client-sock", 1, 0, 'c' },
1197 { "apps-sock", 1, 0, 'a' },
1198 { "kconsumerd-cmd-sock", 1, 0, 0 },
1199 { "kconsumerd-err-sock", 1, 0, 0 },
1200 { "daemonize", 0, 0, 'd' },
1201 { "sig-parent", 0, 0, 'S' },
1202 { "help", 0, 0, 'h' },
1203 { "group", 1, 0, 'g' },
1204 { "version", 0, 0, 'V' },
1205 { "quiet", 0, 0, 'q' },
1206 { "verbose", 0, 0, 'v' },
1207 { NULL, 0, 0, 0 }
1208 };
1209
1210 while (1) {
1211 int option_index = 0;
1212 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index);
1213 if (c == -1) {
1214 break;
1215 }
1216
1217 switch (c) {
1218 case 0:
1219 fprintf(stderr, "option %s", long_options[option_index].name);
1220 if (optarg) {
1221 fprintf(stderr, " with arg %s\n", optarg);
1222 }
1223 break;
1224 case 'c':
1225 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
1226 break;
1227 case 'a':
1228 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
1229 break;
1230 case 'd':
1231 opt_daemon = 1;
1232 break;
1233 case 'g':
1234 opt_tracing_group = strdup(optarg);
1235 break;
1236 case 'h':
1237 usage();
1238 exit(EXIT_FAILURE);
1239 case 'V':
1240 fprintf(stdout, "%s\n", VERSION);
1241 exit(EXIT_SUCCESS);
1242 case 'S':
1243 opt_sig_parent = 1;
1244 break;
1245 case 'E':
1246 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
1247 break;
1248 case 'C':
1249 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
1250 break;
1251 case 'q':
1252 opt_quiet = 1;
1253 break;
1254 case 'v':
1255 opt_verbose = 1;
1256 break;
1257 default:
1258 /* Unknown option or other error.
1259 * Error is printed by getopt, just return */
1260 return -1;
1261 }
1262 }
1263
1264 return 0;
1265 }
1266
1267 /*
1268 * init_daemon_socket
1269 *
1270 * Creates the two needed socket by the daemon.
1271 * apps_sock - The communication socket for all UST apps.
1272 * client_sock - The communication of the cli tool (lttng).
1273 */
1274 static int init_daemon_socket()
1275 {
1276 int ret = 0;
1277 mode_t old_umask;
1278
1279 old_umask = umask(0);
1280
1281 /* Create client tool unix socket */
1282 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
1283 if (client_sock < 0) {
1284 ERR("Create unix sock failed: %s", client_unix_sock_path);
1285 ret = -1;
1286 goto end;
1287 }
1288
1289 /* File permission MUST be 660 */
1290 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1291 if (ret < 0) {
1292 ERR("Set file permissions failed: %s", client_unix_sock_path);
1293 perror("chmod");
1294 goto end;
1295 }
1296
1297 /* Create the application unix socket */
1298 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
1299 if (apps_sock < 0) {
1300 ERR("Create unix sock failed: %s", apps_unix_sock_path);
1301 ret = -1;
1302 goto end;
1303 }
1304
1305 /* File permission MUST be 666 */
1306 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1307 if (ret < 0) {
1308 ERR("Set file permissions failed: %s", apps_unix_sock_path);
1309 perror("chmod");
1310 goto end;
1311 }
1312
1313 end:
1314 umask(old_umask);
1315 return ret;
1316 }
1317
1318 /*
1319 * check_existing_daemon
1320 *
1321 * Check if the global socket is available.
1322 * If yes, error is returned.
1323 */
1324 static int check_existing_daemon()
1325 {
1326 int ret;
1327
1328 ret = access(client_unix_sock_path, F_OK);
1329 if (ret == 0) {
1330 ret = access(apps_unix_sock_path, F_OK);
1331 }
1332
1333 return ret;
1334 }
1335
1336 /*
1337 * get_home_dir
1338 *
1339 * Return pointer to home directory path using
1340 * the env variable HOME.
1341 *
1342 * Default : /tmp
1343 */
1344 static const char *get_home_dir(void)
1345 {
1346 const char *home_path;
1347
1348 if ((home_path = (const char *) getenv("HOME")) == NULL) {
1349 home_path = default_home_dir;
1350 }
1351
1352 return home_path;
1353 }
1354
1355 /*
1356 * set_permissions
1357 *
1358 * Set the tracing group gid onto the client socket.
1359 *
1360 * Race window between mkdir and chown is OK because we are going from
1361 * less permissive (root.root) to more permissive (root.tracing).
1362 */
1363 static int set_permissions(void)
1364 {
1365 int ret;
1366 struct group *grp;
1367
1368 /* Decide which group name to use */
1369 (opt_tracing_group != NULL) ?
1370 (grp = getgrnam(opt_tracing_group)) :
1371 (grp = getgrnam(default_tracing_group));
1372
1373 if (grp == NULL) {
1374 ERR("Missing tracing group. Aborting execution.\n");
1375 ret = -1;
1376 goto end;
1377 }
1378
1379 /* Set lttng run dir */
1380 ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid);
1381 if (ret < 0) {
1382 ERR("Unable to set group on " LTTNG_RUNDIR);
1383 perror("chown");
1384 }
1385
1386 /* lttng client socket path */
1387 ret = chown(client_unix_sock_path, 0, grp->gr_gid);
1388 if (ret < 0) {
1389 ERR("Unable to set group on %s", client_unix_sock_path);
1390 perror("chown");
1391 }
1392
1393 /* kconsumerd error socket path */
1394 ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid);
1395 if (ret < 0) {
1396 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
1397 perror("chown");
1398 }
1399
1400 DBG("All permissions are set");
1401
1402 end:
1403 return ret;
1404 }
1405
1406 /*
1407 * create_lttng_rundir
1408 *
1409 * Create the lttng run directory needed for all
1410 * global sockets and pipe.
1411 */
1412 static int create_lttng_rundir(void)
1413 {
1414 int ret;
1415
1416 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
1417 if (ret < 0) {
1418 if (errno != EEXIST) {
1419 ERR("Unable to create " LTTNG_RUNDIR);
1420 goto error;
1421 } else {
1422 ret = 0;
1423 }
1424 }
1425
1426 error:
1427 return ret;
1428 }
1429
1430 /*
1431 * init_kernel_tracer
1432 *
1433 * Setup necessary data for kernel tracer action.
1434 */
1435 static void init_kernel_tracer(void)
1436 {
1437 /* Set the global kernel tracer fd */
1438 kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
1439 if (kernel_tracer_fd < 0) {
1440 WARN("No kernel tracer available");
1441 kernel_tracer_fd = 0;
1442 }
1443
1444 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1445 }
1446
1447 /*
1448 * set_kconsumerd_sockets
1449 *
1450 * Setup sockets and directory needed by the kconsumerd
1451 * communication with the session daemon.
1452 */
1453 static int set_kconsumerd_sockets(void)
1454 {
1455 int ret;
1456
1457 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
1458 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
1459 }
1460
1461 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
1462 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
1463 }
1464
1465 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
1466 if (ret < 0) {
1467 ERR("Failed to create " KCONSUMERD_PATH);
1468 goto error;
1469 }
1470
1471 /* Create the kconsumerd error unix socket */
1472 kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
1473 if (kconsumerd_err_sock < 0) {
1474 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
1475 ret = -1;
1476 goto error;
1477 }
1478
1479 /* File permission MUST be 660 */
1480 ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1481 if (ret < 0) {
1482 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
1483 perror("chmod");
1484 goto error;
1485 }
1486
1487 error:
1488 return ret;
1489 }
1490
1491 /*
1492 * sighandler
1493 *
1494 * Signal handler for the daemon
1495 */
1496 static void sighandler(int sig)
1497 {
1498 switch (sig) {
1499 case SIGPIPE:
1500 DBG("SIGPIPE catched");
1501 return;
1502 case SIGINT:
1503 DBG("SIGINT catched");
1504 cleanup();
1505 break;
1506 case SIGTERM:
1507 DBG("SIGTERM catched");
1508 cleanup();
1509 break;
1510 default:
1511 break;
1512 }
1513
1514 exit(EXIT_SUCCESS);
1515 }
1516
1517 /*
1518 * set_signal_handler
1519 *
1520 * Setup signal handler for :
1521 * SIGINT, SIGTERM, SIGPIPE
1522 */
1523 static int set_signal_handler(void)
1524 {
1525 int ret = 0;
1526 struct sigaction sa;
1527 sigset_t sigset;
1528
1529 if ((ret = sigemptyset(&sigset)) < 0) {
1530 perror("sigemptyset");
1531 return ret;
1532 }
1533
1534 sa.sa_handler = sighandler;
1535 sa.sa_mask = sigset;
1536 sa.sa_flags = 0;
1537 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
1538 perror("sigaction");
1539 return ret;
1540 }
1541
1542 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
1543 perror("sigaction");
1544 return ret;
1545 }
1546
1547 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
1548 perror("sigaction");
1549 return ret;
1550 }
1551
1552 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
1553
1554 return ret;
1555 }
1556
1557 /*
1558 * main
1559 */
1560 int main(int argc, char **argv)
1561 {
1562 int ret = 0;
1563 void *status;
1564
1565 /* Parse arguments */
1566 progname = argv[0];
1567 if ((ret = parse_args(argc, argv) < 0)) {
1568 goto error;
1569 }
1570
1571 /* Daemonize */
1572 if (opt_daemon) {
1573 ret = daemon(0, 0);
1574 if (ret < 0) {
1575 perror("daemon");
1576 goto error;
1577 }
1578 }
1579
1580 /* Check if daemon is UID = 0 */
1581 is_root = !getuid();
1582
1583 /* Set all sockets path */
1584 if (is_root) {
1585 ret = create_lttng_rundir();
1586 if (ret < 0) {
1587 goto error;
1588 }
1589
1590 if (strlen(apps_unix_sock_path) == 0) {
1591 snprintf(apps_unix_sock_path, PATH_MAX,
1592 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
1593 }
1594
1595 if (strlen(client_unix_sock_path) == 0) {
1596 snprintf(client_unix_sock_path, PATH_MAX,
1597 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
1598 }
1599
1600 ret = set_kconsumerd_sockets();
1601 if (ret < 0) {
1602 goto error;
1603 }
1604
1605 /* Setup kernel tracer */
1606 init_kernel_tracer();
1607 } else {
1608 if (strlen(apps_unix_sock_path) == 0) {
1609 snprintf(apps_unix_sock_path, PATH_MAX,
1610 DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir());
1611 }
1612
1613 /* Set the cli tool unix socket path */
1614 if (strlen(client_unix_sock_path) == 0) {
1615 snprintf(client_unix_sock_path, PATH_MAX,
1616 DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir());
1617 }
1618 }
1619
1620 DBG("Client socket path %s", client_unix_sock_path);
1621 DBG("Application socket path %s", apps_unix_sock_path);
1622
1623 /* See if daemon already exist. If any of the two
1624 * socket needed by the daemon are present, this test fails
1625 */
1626 if ((ret = check_existing_daemon()) == 0) {
1627 ERR("Already running daemon.\n");
1628 /* We do not goto error because we must not
1629 * cleanup() because a daemon is already running.
1630 */
1631 exit(EXIT_FAILURE);
1632 }
1633
1634 if (set_signal_handler() < 0) {
1635 goto error;
1636 }
1637
1638 /* Setup the needed unix socket */
1639 if (init_daemon_socket() < 0) {
1640 goto error;
1641 }
1642
1643 /* Set credentials to socket */
1644 if (is_root && (set_permissions() < 0)) {
1645 goto error;
1646 }
1647
1648 /* Get parent pid if -S, --sig-parent is specified. */
1649 if (opt_sig_parent) {
1650 ppid = getppid();
1651 }
1652
1653 while (1) {
1654 /* Create thread to manage the client socket */
1655 ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
1656 if (ret != 0) {
1657 perror("pthread_create");
1658 goto error;
1659 }
1660
1661 /* Create thread to manage application socket */
1662 ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
1663 if (ret != 0) {
1664 perror("pthread_create");
1665 goto error;
1666 }
1667
1668 ret = pthread_join(client_thread, &status);
1669 if (ret != 0) {
1670 perror("pthread_join");
1671 goto error;
1672 }
1673 }
1674
1675 cleanup();
1676 exit(EXIT_SUCCESS);
1677
1678 error:
1679 cleanup();
1680 exit(EXIT_FAILURE);
1681 }
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