d846c89e58293016b3ffa4abb4c15b96655d8991
[lttng-tools.git] / ltt-sessiond / ltt-sessiond.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 <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sys/ipc.h>
30 #include <sys/shm.h>
31 #include <sys/socket.h>
32 #include <sys/stat.h>
33 #include <sys/types.h>
34 #include <unistd.h>
35
36 #include <urcu/list.h> /* URCU list library (-lurcu) */
37 #include <ust/ustctl.h> /* UST control lib (-lust) */
38
39 #include "liblttsessiondcomm.h"
40 #include "ltt-sessiond.h"
41
42 const char default_home_dir[] = DEFAULT_HOME_DIR;
43 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
44 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
45 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
46
47 /* Static functions */
48 static int set_signal_handler(void);
49 static int set_socket_perms(void);
50 static void sighandler(int);
51 static void daemonize(void);
52 static void cleanup(void);
53 static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm);
54 static int check_existing_daemon(void);
55 static int notify_apps(const char*);
56 static int connect_app(pid_t);
57 static int init_daemon_socket(void);
58 static int process_client_msg(int sock, struct lttcomm_session_msg*);
59 static int send_unix_sock(int sock, void *buf, size_t len);
60
61 static void *thread_manage_clients(void *);
62 static void *thread_manage_apps(void *);
63
64 static int create_session(const char*, uuid_t *);
65 static void destroy_session(uuid_t);
66
67 static struct ltt_session *find_session(uuid_t);
68
69 /* Variables */
70 const char *progname;
71 const char *opt_tracing_group;
72 static int opt_daemon;
73 static int is_root; /* Set to 1 if the daemon is running as root */
74
75 static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
76 static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
77
78 static int client_socket;
79 static int apps_socket;
80
81 static struct ltt_session *current_session;
82
83 /* Number of element for the list below. */
84 static unsigned int session_count;
85 static unsigned int traceable_app_count;
86
87 /* Init session's list */
88 static struct ltt_session_list ltt_session_list = {
89 .head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
90 };
91
92 /* Init ust traceabl application's list */
93 static struct ltt_traceable_app_list ltt_traceable_app_list = {
94 .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head),
95 };
96
97 /*
98 * thread_manage_apps
99 *
100 * This thread manage the application socket communication
101 */
102 static void *thread_manage_apps(void *data)
103 {
104 int sock, ret;
105 struct ltt_traceable_app *lta;
106
107 /* TODO: Something more elegant is needed but fine for now */
108 struct {
109 int reg; /* 1:register, 0:unregister */
110 pid_t pid;
111 uid_t uid;
112 } reg_msg;
113
114 /* Notify all applications to register */
115 notify_apps(default_global_apps_pipe);
116
117 ret = lttcomm_listen_unix_sock(apps_socket);
118 if (ret < 0) {
119 goto error;
120 }
121
122 while (1) {
123 /* Blocking call, waiting for transmission */
124 sock = lttcomm_accept_unix_sock(apps_socket);
125 if (sock < 0) {
126 goto error;
127 }
128
129 /* Basic recv here to handle the very simple data
130 * that the libust send to register (reg_msg).
131 */
132 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
133 if (ret < 0) {
134 perror("recv");
135 continue;
136 }
137
138 /* Add application to the global traceable list */
139 if (reg_msg.reg == 1) {
140 /* Registering */
141 lta = malloc(sizeof(struct ltt_traceable_app));
142 lta->pid = reg_msg.pid;
143 lta->uid = reg_msg.uid;
144 cds_list_add(&lta->list, &ltt_traceable_app_list.head);
145 traceable_app_count++;
146 } else {
147 /* Unregistering */
148 lta = NULL;
149 cds_list_for_each_entry(lta, &ltt_traceable_app_list.head, list) {
150 if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) {
151 cds_list_del(&lta->list);
152 /* Check to not overflow here */
153 if (traceable_app_count != 0) {
154 traceable_app_count--;
155 }
156 break;
157 }
158 }
159
160 /* If an item was found, free it from memory */
161 if (lta) {
162 free(lta);
163 }
164 }
165 }
166
167 error:
168
169 return NULL;
170 }
171
172 /*
173 * thread_manage_clients
174 *
175 * This thread manage all clients request using the unix
176 * client socket for communication.
177 */
178 static void *thread_manage_clients(void *data)
179 {
180 int sock, ret;
181 struct lttcomm_session_msg lsm;
182
183 ret = lttcomm_listen_unix_sock(client_socket);
184 if (ret < 0) {
185 goto error;
186 }
187
188 while (1) {
189 /* Blocking call, waiting for transmission */
190 sock = lttcomm_accept_unix_sock(client_socket);
191 if (sock < 0) {
192 goto error;
193 }
194
195 /*
196 * Data is received from the lttng client. The struct
197 * lttcomm_session_msg (lsm) contains the command and data
198 * request of the client.
199 */
200 ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
201 if (ret < 0) {
202 continue;
203 }
204
205 /* This function dispatch the work to the LTTng or UST libs
206 * and then sends back the response to the client. This is needed
207 * because there might be more then one lttcomm_lttng_msg to
208 * send out so process_client_msg do both jobs.
209 */
210 ret = process_client_msg(sock, &lsm);
211 if (ret < 0) {
212 /* Error detected but still accept command */
213 continue;
214 }
215 }
216
217 error:
218 return NULL;
219 }
220
221 /*
222 * send_unix_sock
223 *
224 * Send data on a unix socket using the liblttsessiondcomm API.
225 *
226 * Return lttcomm error code.
227 */
228 static int send_unix_sock(int sock, void *buf, size_t len)
229 {
230 /* Check valid length */
231 if (len <= 0) {
232 return -1;
233 }
234
235 return lttcomm_send_unix_sock(sock, buf, len);
236 }
237
238 /*
239 * connect_app
240 *
241 * Return a socket connected to the libust communication socket
242 * of the application identified by the pid.
243 */
244 static int connect_app(pid_t pid)
245 {
246 int sock;
247
248 sock = ustctl_connect_pid(pid);
249 if (sock < 0) {
250 fprintf(stderr, "Fail connecting to the PID %d\n", pid);
251 }
252
253 return sock;
254 }
255
256 /*
257 * notify_apps
258 *
259 * Notify apps by writing 42 to a named pipe using name.
260 * Every applications waiting for a ltt-sessiond will be notified
261 * and re-register automatically to the session daemon.
262 *
263 * Return open or write error value.
264 */
265 static int notify_apps(const char *name)
266 {
267 int fd;
268 int ret = -1;
269
270 /* Try opening the global pipe */
271 fd = open(name, O_WRONLY);
272 if (fd < 0) {
273 goto error;
274 }
275
276 /* Notify by writing on the pipe */
277 ret = write(fd, "42", 2);
278 if (ret < 0) {
279 perror("write");
280 }
281
282 error:
283 return ret;
284 }
285
286 /*
287 * find_session
288 *
289 * Return a ltt_session structure ptr that matches the uuid.
290 */
291 static struct ltt_session *find_session(uuid_t session_id)
292 {
293 struct ltt_session *iter = NULL;
294
295 /* Sanity check for NULL session_id */
296 if (uuid_is_null(session_id)) {
297 goto end;
298 }
299
300 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
301 if (uuid_compare(iter->uuid, session_id)) {
302 break;
303 }
304 }
305
306 end:
307 return iter;
308 }
309
310 /*
311 * destroy_session
312 *
313 * Delete session from the global session list
314 * and free the memory.
315 */
316 static void destroy_session(uuid_t session_id)
317 {
318 struct ltt_session *iter = NULL;
319
320 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
321 if (uuid_compare(iter->uuid, session_id)) {
322 cds_list_del(&iter->list);
323 break;
324 }
325 }
326
327 if (iter) {
328 free(iter);
329 session_count--;
330 }
331 }
332
333 /*
334 * create_session
335 *
336 * Create a brand new session,
337 */
338 static int create_session(const char *name, uuid_t *session_id)
339 {
340 struct ltt_session *new_session;
341
342 /* Allocate session data structure */
343 new_session = malloc(sizeof(struct ltt_session));
344 if (new_session == NULL) {
345 perror("malloc");
346 goto error;
347 }
348
349 if (name != NULL) {
350 if (asprintf(&new_session->name, "%s", name) < 0) {
351 goto error;
352 }
353 } else {
354 /* Generate session name based on the session count */
355 if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) {
356 goto error;
357 }
358 }
359
360 /* UUID generation */
361 uuid_generate(new_session->uuid);
362 uuid_copy(*session_id, new_session->uuid);
363
364 /* Set consumer (identifier) to 0. This means that there is
365 * NO consumer attach to that session yet.
366 */
367 new_session->ust_consumer = 0;
368 new_session->lttng_consumer = 0;
369
370 /* Init list */
371 CDS_INIT_LIST_HEAD(&new_session->ust_traces);
372 CDS_INIT_LIST_HEAD(&new_session->lttng_traces);
373
374 /* Add new session to the global session list */
375 cds_list_add(&new_session->list, &ltt_session_list.head);
376
377 session_count++;
378
379 return 0;
380
381 error:
382 return -1;
383 }
384
385 /*
386 * ust_list_apps
387 *
388 * List traceable user-space application and fill an
389 * array of pids.
390 *
391 * Return size of the array.
392 */
393 static size_t ust_list_apps(pid_t **pids)
394 {
395 size_t size = 0;
396 struct ltt_traceable_app *iter = NULL;
397 pid_t *p;
398
399 if (traceable_app_count == 0) {
400 /* No dynamic allocation is done */
401 goto end;
402 }
403
404 p = malloc(sizeof(pid_t) * traceable_app_count);
405
406 /* TODO: Mutex needed to access this list */
407 cds_list_for_each_entry(iter, &ltt_traceable_app_list.head, list) {
408 p[size] = iter->pid;
409 size++;
410 }
411
412 *pids = p;
413
414 end:
415 return size;
416 }
417
418 /*
419 * copy_common_data
420 *
421 * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg
422 */
423 static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm)
424 {
425 llm->cmd_type = lsm->cmd_type;
426 llm->pid = lsm->pid;
427 if (!uuid_is_null(lsm->session_id)) {
428 uuid_copy(llm->session_id, lsm->session_id);
429 }
430 strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name));
431 }
432
433 /*
434 * process_client_msg
435 *
436 * This takes the lttcomm_session_msg struct and process the command requested
437 * by the client. It then creates response(s) and send it back to the
438 * given socket (sock).
439 *
440 * Return any error encountered or 0 for success.
441 */
442 static int process_client_msg(int sock, struct lttcomm_session_msg *lsm)
443 {
444 int ret;
445 struct lttcomm_lttng_msg llm;
446
447 /* Copy common data to identify the response
448 * on the lttng client side.
449 */
450 copy_common_data(&llm, lsm);
451
452 /* Default return code.
453 * In our world, everything is OK... right? ;)
454 */
455 llm.ret_code = LTTCOMM_OK;
456
457 /* Process by command type */
458 switch (lsm->cmd_type) {
459 case UST_LIST_APPS:
460 {
461 pid_t *pids;
462 llm.num_pckt = ust_list_apps(&pids);
463 if (llm.num_pckt == 0) {
464 ret = LTTCOMM_NO_APPS;
465 goto error;
466 }
467
468 /* Send all packets */
469 while (llm.num_pckt != 0) {
470 llm.u.list_apps.pid = pids[traceable_app_count - llm.num_pckt];
471 ret = send_unix_sock(sock, (void*) &llm, sizeof(llm));
472 if (ret < 0) {
473 goto send_error;
474 }
475 llm.num_pckt--;
476 }
477 /* Allocated array by ust_list_apps() */
478 free(pids);
479
480 break;
481 }
482 default:
483 {
484 /* Undefined command */
485 ret = LTTCOMM_UND;
486 break;
487 }
488 }
489
490 return 0;
491
492 send_error:
493 return ret;
494
495 error:
496 /* Notify client of error */
497 llm.ret_code = ret;
498 send_unix_sock(sock, (void*) &llm, sizeof(llm));
499
500 return -1;
501 }
502
503 /*
504 * usage function on stderr
505 */
506 static void usage(void)
507 {
508 fprintf(stderr, "Usage:\n%s OPTIONS\n\nOptions:\n"
509 "\t-h, --help\t\tDisplay this usage.\n"
510 "\t-c, --client-sock PATH\t\tSpecify path for the client unix socket\n"
511 "\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n"
512 "\t-d, --daemonize\t\tStart as a daemon.\n"
513 "\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n"
514 "\t-V, --version\t\tShow version number.\n",
515 progname);
516 }
517
518 /*
519 * daemon argument parsing
520 */
521 static int parse_args(int argc, char **argv)
522 {
523 int c;
524
525 static struct option long_options[] = {
526 { "client-sock", 1, 0, 'c' },
527 { "apps-sock", 1, 0, 'a' },
528 { "daemonize", 0, 0, 'd' },
529 { "help", 0, 0, 'h' },
530 { "group", 1, 0, 'g' },
531 { "version", 0, 0, 'V' },
532 { NULL, 0, 0, 0 }
533 };
534
535 while (1) {
536 int option_index = 0;
537 c = getopt_long(argc, argv, "dhV" "a:c:g:s:", long_options, &option_index);
538 if (c == -1) {
539 break;
540 }
541
542 switch (c) {
543 case 0:
544 fprintf(stderr, "option %s", long_options[option_index].name);
545 if (optarg) {
546 fprintf(stderr, " with arg %s\n", optarg);
547 }
548 break;
549 case 's':
550 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
551 break;
552 case 'a':
553 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
554 break;
555 case 'd':
556 opt_daemon = 1;
557 break;
558 case 'g':
559 opt_tracing_group = strdup(optarg);
560 break;
561 case 'h':
562 usage();
563 exit(EXIT_FAILURE);
564 case 'V':
565 fprintf(stdout, "%s\n", VERSION);
566 exit(EXIT_SUCCESS);
567 default:
568 /* Unknown option or other error.
569 * Error is printed by getopt, just return */
570 return -1;
571 }
572 }
573
574 return 0;
575 }
576
577 /*
578 * init_daemon_socket
579 *
580 * Creates the two needed socket by the daemon.
581 * apps_socket - The communication socket for all UST apps.
582 * client_socket - The communication of the cli tool (lttng).
583 */
584 static int init_daemon_socket()
585 {
586 int ret = 0;
587 mode_t old_umask;
588
589 old_umask = umask(0);
590
591 /* Create client tool unix socket */
592 client_socket = lttcomm_create_unix_sock(client_unix_sock_path);
593 if (client_socket < 0) {
594 ret = -1;
595 goto end;
596 }
597
598 /* File permission MUST be 660 */
599 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
600 if (ret < 0) {
601 perror("chmod");
602 goto end;
603 }
604
605 /* Create the application unix socket */
606 apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path);
607 if (apps_socket < 0) {
608 ret = -1;
609 goto end;
610 }
611
612 /* File permission MUST be 660 */
613 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
614 if (ret < 0) {
615 perror("chmod");
616 goto end;
617 }
618
619 end:
620 umask(old_umask);
621 return ret;
622 }
623
624 /*
625 * check_existing_daemon
626 *
627 * Check if the global socket is available.
628 * If yes, error is returned.
629 */
630 static int check_existing_daemon()
631 {
632 int ret;
633
634 ret = access(client_unix_sock_path, F_OK);
635 if (ret == 0) {
636 ret = access(apps_unix_sock_path, F_OK);
637 }
638
639 return ret;
640 }
641
642 /*
643 * get_home_dir
644 *
645 * Return pointer to home directory path using
646 * the env variable HOME.
647 *
648 * Default : /tmp
649 */
650 static const char *get_home_dir(void)
651 {
652 const char *home_path;
653
654 if ((home_path = (const char *) getenv("HOME")) == NULL) {
655 home_path = default_home_dir;
656 }
657
658 return home_path;
659 }
660
661 /*
662 * set_socket_perms
663 *
664 * Set the tracing group gid onto the client socket.
665 */
666 static int set_socket_perms(void)
667 {
668 int ret;
669 struct group *grp;
670
671 /* Decide which group name to use */
672 (opt_tracing_group != NULL) ?
673 (grp = getgrnam(opt_tracing_group)) :
674 (grp = getgrnam(default_tracing_group));
675
676 if (grp == NULL) {
677 fprintf(stderr, "Missing tracing group. Aborting execution.\n");
678 ret = -1;
679 goto end;
680 }
681
682 ret = chown(client_unix_sock_path, 0, grp->gr_gid);
683 if (ret < 0) {
684 perror("chown");
685 }
686
687 end:
688 return ret;
689 }
690
691 /*
692 * daemonize
693 *
694 * Daemonize ltt-sessiond.
695 */
696 static void daemonize(void)
697 {
698 pid_t pid, sid;
699 const char *home_dir = get_home_dir();
700
701 /* Fork off the parent process */
702 if ((pid = fork()) < 0) {
703 perror("fork");
704 exit(EXIT_FAILURE);
705 }
706
707 /* Parent can now exit */
708 if (pid > 0) {
709 exit(EXIT_SUCCESS);
710 }
711
712 /* Change the file mode mask */
713 umask(0);
714
715 /* Create a new SID for the child process */
716 if ((sid = setsid()) < 0) {
717 perror("setsid");
718 exit(EXIT_FAILURE);
719 }
720
721 /* Change the current working directory */
722 if ((chdir(home_dir)) < 0) {
723 perror("chdir");
724 exit(EXIT_FAILURE);
725 }
726
727 /* Close out the standard file descriptors */
728 close(STDIN_FILENO);
729 close(STDOUT_FILENO);
730 close(STDERR_FILENO);
731 }
732
733 /*
734 * set_signal_handler
735 *
736 * Setup signal handler for :
737 * SIGINT, SIGTERM, SIGPIPE
738 */
739 static int set_signal_handler(void)
740 {
741 int ret = 0;
742 struct sigaction sa;
743 sigset_t sigset;
744
745 if ((ret = sigemptyset(&sigset)) < 0) {
746 perror("sigemptyset");
747 return ret;
748 }
749
750 sa.sa_handler = sighandler;
751 sa.sa_mask = sigset;
752 sa.sa_flags = 0;
753 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
754 perror("sigaction");
755 return ret;
756 }
757
758 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
759 perror("sigaction");
760 return ret;
761 }
762
763 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
764 perror("sigaction");
765 return ret;
766 }
767
768 return ret;
769 }
770
771 /**
772 * sighandler
773 *
774 * Signal handler for the daemon
775 */
776 static void sighandler(int sig)
777 {
778 switch (sig) {
779 case SIGPIPE:
780 case SIGINT:
781 case SIGTERM:
782 cleanup();
783 break;
784 default:
785 break;
786 }
787
788 exit(EXIT_SUCCESS);
789 }
790
791 /*
792 * cleanup
793 *
794 * Cleanup the daemon on exit
795 */
796 static void cleanup()
797 {
798 /* <fun> */
799 fprintf(stdout, "\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
800 fprintf(stdout, "%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0);
801 /* </fun> */
802
803 unlink(client_unix_sock_path);
804 unlink(apps_unix_sock_path);
805 }
806
807 /*
808 * main
809 */
810 int main(int argc, char **argv)
811 {
812 int i;
813 int ret = 0;
814 void *status;
815 pthread_t threads[2];
816
817 /* Parse arguments */
818 progname = argv[0];
819 if ((ret = parse_args(argc, argv) < 0)) {
820 goto error;
821 }
822
823 /* Daemonize */
824 if (opt_daemon) {
825 daemonize();
826 }
827
828 /* Check if daemon is UID = 0 */
829 is_root = !getuid();
830
831 /* Set all sockets path */
832 if (is_root) {
833 if (strlen(apps_unix_sock_path) == 0) {
834 (snprintf(apps_unix_sock_path, PATH_MAX,
835 DEFAULT_GLOBAL_APPS_UNIX_SOCK));
836 }
837
838 if (strlen(client_unix_sock_path) == 0) {
839 (snprintf(client_unix_sock_path, PATH_MAX,
840 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK));
841 }
842 } else {
843 if (strlen(apps_unix_sock_path) == 0) {
844 (snprintf(apps_unix_sock_path, PATH_MAX,
845 DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir()));
846 }
847
848 /* Set the cli tool unix socket path */
849 if (strlen(client_unix_sock_path) == 0) {
850 (snprintf(client_unix_sock_path, PATH_MAX,
851 DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir()));
852 }
853 }
854
855 /* See if daemon already exist. If any of the two
856 * socket needed by the daemon are present, this test fails
857 */
858 if ((ret = check_existing_daemon()) == 0) {
859 fprintf(stderr, "Already running daemon.\n");
860 goto error;
861 }
862
863 if (set_signal_handler() < 0) {
864 goto error;
865 }
866
867 /* Setup the two needed unix socket */
868 if (init_daemon_socket() < 0) {
869 goto error;
870 }
871
872 /* Set credentials to socket */
873 if (is_root && (set_socket_perms() < 0)) {
874 goto error;
875 }
876
877 while (1) {
878 /* Create thread to manage the client socket */
879 ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL);
880 if (ret != 0) {
881 perror("pthread_create");
882 goto error;
883 }
884
885 /* Create thread to manage application socket */
886 ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL);
887 if (ret != 0) {
888 perror("pthread_create");
889 goto error;
890 }
891
892 for (i = 0; i < 2; i++) {
893 ret = pthread_join(threads[i], &status);
894 if (ret != 0) {
895 perror("pthread_join");
896 goto error;
897 }
898 }
899 }
900
901 cleanup();
902 return 0;
903
904 error:
905 cleanup();
906
907 return EXIT_FAILURE;
908 }
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