Add support for session daemon auto spawn
[lttng-tools.git] / ltt-sessiond / ltt-sessiond.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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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.
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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
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42const char default_home_dir[] = DEFAULT_HOME_DIR;
43const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
44const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
45const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
46
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47/* Static functions */
48static int set_signal_handler(void);
49static int set_socket_perms(void);
50static void sighandler(int);
51static void daemonize(void);
52static void cleanup(void);
e065084a 53static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm);
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54static int check_existing_daemon(void);
55static int notify_apps(const char*);
56static int connect_app(pid_t);
57static int init_daemon_socket(void);
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58static int process_client_msg(int sock, struct lttcomm_session_msg*);
59static int send_unix_sock(int sock, void *buf, size_t len);
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60
61static void *thread_manage_clients(void *);
62static void *thread_manage_apps(void *);
63
64static int create_session(const char*, uuid_t *);
65static void destroy_session(uuid_t);
66
67static struct ltt_session *find_session(uuid_t);
68
69/* Variables */
70const char *progname;
71const char *opt_tracing_group;
5b8719f5 72static int opt_sig_parent;
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73static int opt_daemon;
74static int is_root; /* Set to 1 if the daemon is running as root */
5b8719f5 75static pid_t ppid;
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76
77static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
78static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
79
80static int client_socket;
81static int apps_socket;
82
83static struct ltt_session *current_session;
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84
85/* Number of element for the list below. */
86static unsigned int session_count;
87static unsigned int traceable_app_count;
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88
89/* Init session's list */
90static struct ltt_session_list ltt_session_list = {
91 .head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
92};
93
e065084a 94/* Init ust traceabl application's list */
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95static struct ltt_traceable_app_list ltt_traceable_app_list = {
96 .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head),
97};
98
99/*
100 * thread_manage_apps
101 *
102 * This thread manage the application socket communication
103 */
104static void *thread_manage_apps(void *data)
105{
106 int sock, ret;
107 struct ltt_traceable_app *lta;
108
109 /* TODO: Something more elegant is needed but fine for now */
686204ab 110 struct {
fac6795d 111 int reg; /* 1:register, 0:unregister */
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112 pid_t pid;
113 uid_t uid;
114 } reg_msg;
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115
116 /* Notify all applications to register */
117 notify_apps(default_global_apps_pipe);
118
119 ret = lttcomm_listen_unix_sock(apps_socket);
120 if (ret < 0) {
121 goto error;
122 }
123
124 while (1) {
125 /* Blocking call, waiting for transmission */
126 sock = lttcomm_accept_unix_sock(apps_socket);
127 if (sock < 0) {
128 goto error;
129 }
130
131 /* Basic recv here to handle the very simple data
132 * that the libust send to register (reg_msg).
133 */
134 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
135 if (ret < 0) {
136 perror("recv");
137 continue;
138 }
139
140 /* Add application to the global traceable list */
141 if (reg_msg.reg == 1) {
142 /* Registering */
143 lta = malloc(sizeof(struct ltt_traceable_app));
144 lta->pid = reg_msg.pid;
145 lta->uid = reg_msg.uid;
146 cds_list_add(&lta->list, &ltt_traceable_app_list.head);
e065084a 147 traceable_app_count++;
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148 } else {
149 /* Unregistering */
150 lta = NULL;
151 cds_list_for_each_entry(lta, &ltt_traceable_app_list.head, list) {
152 if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) {
153 cds_list_del(&lta->list);
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154 /* Check to not overflow here */
155 if (traceable_app_count != 0) {
156 traceable_app_count--;
157 }
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158 break;
159 }
160 }
161
162 /* If an item was found, free it from memory */
163 if (lta) {
164 free(lta);
165 }
166 }
167 }
168
169error:
170
171 return NULL;
172}
173
174/*
175 * thread_manage_clients
176 *
177 * This thread manage all clients request using the unix
178 * client socket for communication.
179 */
180static void *thread_manage_clients(void *data)
181{
182 int sock, ret;
183 struct lttcomm_session_msg lsm;
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184
185 ret = lttcomm_listen_unix_sock(client_socket);
186 if (ret < 0) {
187 goto error;
188 }
189
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190 /* Notify parent pid that we are ready
191 * to accept command for client side.
192 */
193 if (opt_sig_parent) {
194 kill(ppid, SIGCHLD);
195 }
196
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197 while (1) {
198 /* Blocking call, waiting for transmission */
199 sock = lttcomm_accept_unix_sock(client_socket);
200 if (sock < 0) {
201 goto error;
202 }
203
204 /*
205 * Data is received from the lttng client. The struct
206 * lttcomm_session_msg (lsm) contains the command and data
207 * request of the client.
208 */
209 ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
210 if (ret < 0) {
211 continue;
212 }
213
214 /* This function dispatch the work to the LTTng or UST libs
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215 * and then sends back the response to the client. This is needed
216 * because there might be more then one lttcomm_lttng_msg to
217 * send out so process_client_msg do both jobs.
fac6795d 218 */
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219 ret = process_client_msg(sock, &lsm);
220 if (ret < 0) {
221 /* Error detected but still accept command */
222 continue;
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223 }
224 }
225
226error:
227 return NULL;
228}
229
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230/*
231 * send_unix_sock
232 *
233 * Send data on a unix socket using the liblttsessiondcomm API.
234 *
235 * Return lttcomm error code.
236 */
237static int send_unix_sock(int sock, void *buf, size_t len)
238{
239 /* Check valid length */
240 if (len <= 0) {
241 return -1;
242 }
243
244 return lttcomm_send_unix_sock(sock, buf, len);
245}
246
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247/*
248 * connect_app
249 *
250 * Return a socket connected to the libust communication socket
251 * of the application identified by the pid.
252 */
253static int connect_app(pid_t pid)
254{
255 int sock;
256
257 sock = ustctl_connect_pid(pid);
258 if (sock < 0) {
259 fprintf(stderr, "Fail connecting to the PID %d\n", pid);
260 }
261
262 return sock;
263}
264
265/*
266 * notify_apps
267 *
268 * Notify apps by writing 42 to a named pipe using name.
269 * Every applications waiting for a ltt-sessiond will be notified
270 * and re-register automatically to the session daemon.
271 *
272 * Return open or write error value.
273 */
274static int notify_apps(const char *name)
275{
276 int fd;
277 int ret = -1;
278
279 /* Try opening the global pipe */
280 fd = open(name, O_WRONLY);
281 if (fd < 0) {
282 goto error;
283 }
284
285 /* Notify by writing on the pipe */
286 ret = write(fd, "42", 2);
287 if (ret < 0) {
288 perror("write");
289 }
290
291error:
292 return ret;
293}
294
295/*
296 * find_session
297 *
298 * Return a ltt_session structure ptr that matches the uuid.
299 */
300static struct ltt_session *find_session(uuid_t session_id)
301{
302 struct ltt_session *iter = NULL;
303
304 /* Sanity check for NULL session_id */
305 if (uuid_is_null(session_id)) {
306 goto end;
307 }
308
309 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
310 if (uuid_compare(iter->uuid, session_id)) {
311 break;
312 }
313 }
314
315end:
316 return iter;
317}
318
319/*
320 * destroy_session
321 *
322 * Delete session from the global session list
323 * and free the memory.
324 */
325static void destroy_session(uuid_t session_id)
326{
327 struct ltt_session *iter = NULL;
328
329 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
330 if (uuid_compare(iter->uuid, session_id)) {
331 cds_list_del(&iter->list);
332 break;
333 }
334 }
335
336 if (iter) {
337 free(iter);
338 session_count--;
339 }
340}
341
342/*
343 * create_session
344 *
345 * Create a brand new session,
346 */
347static int create_session(const char *name, uuid_t *session_id)
348{
349 struct ltt_session *new_session;
350
351 /* Allocate session data structure */
352 new_session = malloc(sizeof(struct ltt_session));
353 if (new_session == NULL) {
354 perror("malloc");
355 goto error;
356 }
357
358 if (name != NULL) {
359 if (asprintf(&new_session->name, "%s", name) < 0) {
360 goto error;
361 }
362 } else {
363 /* Generate session name based on the session count */
364 if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) {
365 goto error;
366 }
367 }
368
369 /* UUID generation */
370 uuid_generate(new_session->uuid);
371 uuid_copy(*session_id, new_session->uuid);
372
373 /* Set consumer (identifier) to 0. This means that there is
374 * NO consumer attach to that session yet.
375 */
376 new_session->ust_consumer = 0;
377 new_session->lttng_consumer = 0;
378
379 /* Init list */
380 CDS_INIT_LIST_HEAD(&new_session->ust_traces);
381 CDS_INIT_LIST_HEAD(&new_session->lttng_traces);
382
383 /* Add new session to the global session list */
384 cds_list_add(&new_session->list, &ltt_session_list.head);
385
386 session_count++;
387
388 return 0;
389
390error:
391 return -1;
392}
393
394/*
395 * ust_list_apps
396 *
397 * List traceable user-space application and fill an
398 * array of pids.
399 *
400 * Return size of the array.
401 */
e065084a 402static size_t ust_list_apps(pid_t **pids)
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403{
404 size_t size = 0;
405 struct ltt_traceable_app *iter = NULL;
e065084a 406 pid_t *p;
fac6795d 407
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408 if (traceable_app_count == 0) {
409 /* No dynamic allocation is done */
410 goto end;
411 }
412
413 p = malloc(sizeof(pid_t) * traceable_app_count);
fac6795d 414
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415 /* TODO: Mutex needed to access this list */
416 cds_list_for_each_entry(iter, &ltt_traceable_app_list.head, list) {
417 p[size] = iter->pid;
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418 size++;
419 }
420
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421 *pids = p;
422
423end:
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424 return size;
425}
426
e065084a
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427/*
428 * copy_common_data
429 *
430 * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg
431 */
432static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm)
433{
434 llm->cmd_type = lsm->cmd_type;
435 llm->pid = lsm->pid;
436 if (!uuid_is_null(lsm->session_id)) {
437 uuid_copy(llm->session_id, lsm->session_id);
438 }
439 strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name));
440}
441
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442/*
443 * process_client_msg
444 *
445 * This takes the lttcomm_session_msg struct and process the command requested
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446 * by the client. It then creates response(s) and send it back to the
447 * given socket (sock).
fac6795d 448 *
e065084a 449 * Return any error encountered or 0 for success.
fac6795d 450 */
e065084a 451static int process_client_msg(int sock, struct lttcomm_session_msg *lsm)
fac6795d 452{
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453 int ret;
454 struct lttcomm_lttng_msg llm;
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455
456 /* Copy common data to identify the response
457 * on the lttng client side.
458 */
e065084a 459 copy_common_data(&llm, lsm);
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460
461 /* Default return code.
e065084a 462 * In our world, everything is OK... right? ;)
fac6795d 463 */
e065084a 464 llm.ret_code = LTTCOMM_OK;
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465
466 /* Process by command type */
467 switch (lsm->cmd_type) {
468 case UST_LIST_APPS:
469 {
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470 pid_t *pids;
471 llm.num_pckt = ust_list_apps(&pids);
472 if (llm.num_pckt == 0) {
473 ret = LTTCOMM_NO_APPS;
474 goto error;
475 }
476
477 /* Send all packets */
478 while (llm.num_pckt != 0) {
479 llm.u.list_apps.pid = pids[traceable_app_count - llm.num_pckt];
480 ret = send_unix_sock(sock, (void*) &llm, sizeof(llm));
481 if (ret < 0) {
482 goto send_error;
483 }
484 llm.num_pckt--;
485 }
486 /* Allocated array by ust_list_apps() */
487 free(pids);
488
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489 break;
490 }
491 default:
e065084a 492 {
fac6795d 493 /* Undefined command */
e065084a 494 ret = LTTCOMM_UND;
fac6795d 495 break;
e065084a 496 }
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497 }
498
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499 return 0;
500
501send_error:
502 return ret;
503
504error:
505 /* Notify client of error */
506 llm.ret_code = ret;
507 send_unix_sock(sock, (void*) &llm, sizeof(llm));
508
509 return -1;
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510}
511
512/*
513 * usage function on stderr
514 */
515static void usage(void)
516{
517 fprintf(stderr, "Usage:\n%s OPTIONS\n\nOptions:\n"
518 "\t-h, --help\t\tDisplay this usage.\n"
519 "\t-c, --client-sock PATH\t\tSpecify path for the client unix socket\n"
520 "\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n"
521 "\t-d, --daemonize\t\tStart as a daemon.\n"
522 "\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n"
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523 "\t-V, --version\t\tShow version number.\n"
524 "\t-S, --sig-parent\t\tSend SIGCHLD to parent pid to notify readiness.\n",
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525 progname);
526}
527
528/*
529 * daemon argument parsing
530 */
531static int parse_args(int argc, char **argv)
532{
533 int c;
534
535 static struct option long_options[] = {
536 { "client-sock", 1, 0, 'c' },
537 { "apps-sock", 1, 0, 'a' },
538 { "daemonize", 0, 0, 'd' },
5b8719f5 539 { "sig-parent", 0, 0, 'S' },
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540 { "help", 0, 0, 'h' },
541 { "group", 1, 0, 'g' },
542 { "version", 0, 0, 'V' },
543 { NULL, 0, 0, 0 }
544 };
545
546 while (1) {
547 int option_index = 0;
5b8719f5 548 c = getopt_long(argc, argv, "dhVS" "a:c:g:s:", long_options, &option_index);
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549 if (c == -1) {
550 break;
551 }
552
553 switch (c) {
554 case 0:
555 fprintf(stderr, "option %s", long_options[option_index].name);
556 if (optarg) {
557 fprintf(stderr, " with arg %s\n", optarg);
558 }
559 break;
560 case 's':
561 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
562 break;
563 case 'a':
564 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
565 break;
566 case 'd':
567 opt_daemon = 1;
568 break;
569 case 'g':
570 opt_tracing_group = strdup(optarg);
571 break;
572 case 'h':
573 usage();
574 exit(EXIT_FAILURE);
575 case 'V':
576 fprintf(stdout, "%s\n", VERSION);
577 exit(EXIT_SUCCESS);
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578 case 'S':
579 opt_sig_parent = 1;
580 break;
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581 default:
582 /* Unknown option or other error.
583 * Error is printed by getopt, just return */
584 return -1;
585 }
586 }
587
588 return 0;
589}
590
591/*
592 * init_daemon_socket
593 *
594 * Creates the two needed socket by the daemon.
595 * apps_socket - The communication socket for all UST apps.
596 * client_socket - The communication of the cli tool (lttng).
597 */
598static int init_daemon_socket()
599{
600 int ret = 0;
601 mode_t old_umask;
602
603 old_umask = umask(0);
604
605 /* Create client tool unix socket */
606 client_socket = lttcomm_create_unix_sock(client_unix_sock_path);
607 if (client_socket < 0) {
608 ret = -1;
609 goto end;
610 }
611
612 /* File permission MUST be 660 */
613 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
614 if (ret < 0) {
615 perror("chmod");
616 goto end;
617 }
618
619 /* Create the application unix socket */
620 apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path);
621 if (apps_socket < 0) {
622 ret = -1;
623 goto end;
624 }
625
626 /* File permission MUST be 660 */
627 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
628 if (ret < 0) {
629 perror("chmod");
630 goto end;
631 }
632
633end:
634 umask(old_umask);
635 return ret;
636}
637
638/*
639 * check_existing_daemon
640 *
641 * Check if the global socket is available.
642 * If yes, error is returned.
643 */
644static int check_existing_daemon()
645{
646 int ret;
647
648 ret = access(client_unix_sock_path, F_OK);
649 if (ret == 0) {
650 ret = access(apps_unix_sock_path, F_OK);
651 }
652
653 return ret;
654}
655
656/*
657 * get_home_dir
658 *
659 * Return pointer to home directory path using
660 * the env variable HOME.
661 *
662 * Default : /tmp
663 */
664static const char *get_home_dir(void)
665{
666 const char *home_path;
667
686204ab 668 if ((home_path = (const char *) getenv("HOME")) == NULL) {
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669 home_path = default_home_dir;
670 }
671
672 return home_path;
673}
674
675/*
676 * set_socket_perms
677 *
678 * Set the tracing group gid onto the client socket.
679 */
680static int set_socket_perms(void)
681{
682 int ret;
683 struct group *grp;
684
685 /* Decide which group name to use */
686 (opt_tracing_group != NULL) ?
687 (grp = getgrnam(opt_tracing_group)) :
688 (grp = getgrnam(default_tracing_group));
689
690 if (grp == NULL) {
691 fprintf(stderr, "Missing tracing group. Aborting execution.\n");
692 ret = -1;
693 goto end;
694 }
695
696 ret = chown(client_unix_sock_path, 0, grp->gr_gid);
697 if (ret < 0) {
698 perror("chown");
699 }
700
701end:
702 return ret;
703}
704
705/*
706 * daemonize
707 *
708 * Daemonize ltt-sessiond.
709 */
710static void daemonize(void)
711{
712 pid_t pid, sid;
713 const char *home_dir = get_home_dir();
714
715 /* Fork off the parent process */
716 if ((pid = fork()) < 0) {
717 perror("fork");
718 exit(EXIT_FAILURE);
719 }
720
721 /* Parent can now exit */
722 if (pid > 0) {
723 exit(EXIT_SUCCESS);
724 }
725
726 /* Change the file mode mask */
727 umask(0);
728
729 /* Create a new SID for the child process */
730 if ((sid = setsid()) < 0) {
731 perror("setsid");
732 exit(EXIT_FAILURE);
733 }
734
735 /* Change the current working directory */
736 if ((chdir(home_dir)) < 0) {
737 perror("chdir");
738 exit(EXIT_FAILURE);
739 }
740
741 /* Close out the standard file descriptors */
742 close(STDIN_FILENO);
743 close(STDOUT_FILENO);
744 close(STDERR_FILENO);
745}
746
747/*
748 * set_signal_handler
749 *
750 * Setup signal handler for :
751 * SIGINT, SIGTERM, SIGPIPE
752 */
753static int set_signal_handler(void)
754{
755 int ret = 0;
756 struct sigaction sa;
757 sigset_t sigset;
758
759 if ((ret = sigemptyset(&sigset)) < 0) {
760 perror("sigemptyset");
761 return ret;
762 }
763
764 sa.sa_handler = sighandler;
765 sa.sa_mask = sigset;
766 sa.sa_flags = 0;
767 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
768 perror("sigaction");
769 return ret;
770 }
771
772 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
773 perror("sigaction");
774 return ret;
775 }
776
777 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
778 perror("sigaction");
779 return ret;
780 }
781
782 return ret;
783}
784
785/**
786 * sighandler
787 *
788 * Signal handler for the daemon
789 */
790static void sighandler(int sig)
791{
792 switch (sig) {
793 case SIGPIPE:
794 case SIGINT:
795 case SIGTERM:
796 cleanup();
686204ab 797 break;
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798 default:
799 break;
800 }
801
802 exit(EXIT_SUCCESS);
803}
804
805/*
806 * cleanup
807 *
808 * Cleanup the daemon on exit
809 */
810static void cleanup()
811{
812 /* <fun> */
813 fprintf(stdout, "\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
814 fprintf(stdout, "%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0);
815 /* </fun> */
816
817 unlink(client_unix_sock_path);
818 unlink(apps_unix_sock_path);
819}
820
821/*
822 * main
823 */
824int main(int argc, char **argv)
825{
826 int i;
827 int ret = 0;
828 void *status;
829 pthread_t threads[2];
830
831 /* Parse arguments */
832 progname = argv[0];
833 if ((ret = parse_args(argc, argv) < 0)) {
834 goto error;
835 }
836
837 /* Daemonize */
838 if (opt_daemon) {
839 daemonize();
840 }
841
842 /* Check if daemon is UID = 0 */
843 is_root = !getuid();
844
845 /* Set all sockets path */
846 if (is_root) {
847 if (strlen(apps_unix_sock_path) == 0) {
848 (snprintf(apps_unix_sock_path, PATH_MAX,
849 DEFAULT_GLOBAL_APPS_UNIX_SOCK));
850 }
851
852 if (strlen(client_unix_sock_path) == 0) {
853 (snprintf(client_unix_sock_path, PATH_MAX,
854 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK));
855 }
856 } else {
857 if (strlen(apps_unix_sock_path) == 0) {
858 (snprintf(apps_unix_sock_path, PATH_MAX,
859 DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir()));
860 }
861
862 /* Set the cli tool unix socket path */
863 if (strlen(client_unix_sock_path) == 0) {
864 (snprintf(client_unix_sock_path, PATH_MAX,
865 DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir()));
866 }
867 }
868
869 /* See if daemon already exist. If any of the two
870 * socket needed by the daemon are present, this test fails
871 */
872 if ((ret = check_existing_daemon()) == 0) {
873 fprintf(stderr, "Already running daemon.\n");
874 goto error;
875 }
876
877 if (set_signal_handler() < 0) {
878 goto error;
879 }
880
881 /* Setup the two needed unix socket */
882 if (init_daemon_socket() < 0) {
883 goto error;
884 }
885
886 /* Set credentials to socket */
887 if (is_root && (set_socket_perms() < 0)) {
888 goto error;
889 }
890
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891 /* Get parent pid if -S, --sig-parent is specified. */
892 if (opt_sig_parent) {
893 ppid = getppid();
894 }
895
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896 while (1) {
897 /* Create thread to manage the client socket */
898 ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL);
899 if (ret != 0) {
900 perror("pthread_create");
901 goto error;
902 }
903
904 /* Create thread to manage application socket */
905 ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL);
906 if (ret != 0) {
907 perror("pthread_create");
908 goto error;
909 }
910
911 for (i = 0; i < 2; i++) {
912 ret = pthread_join(threads[i], &status);
913 if (ret != 0) {
914 perror("pthread_join");
915 goto error;
916 }
917 }
918 }
919
920 cleanup();
921 return 0;
922
923error:
924 cleanup();
925
926 return EXIT_FAILURE;
927}
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