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1 /* Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2
3 /** \file server.c Paraslash's main server. */
4
5 /**
6 * \mainpage Main data structures and selected APIs:
7 *
8 * - Senders: \ref sender,
9 * - Audio file selector: \ref afs_info, \ref afs_table,
10 * - Audio format handler: \ref audio_format_handler, \ref afh_info
11 * - Receivers/filters/writers: \ref receiver, \ref receiver_node,
12 * \ref filter, \ref filter_node, \ref writer_node, \ref writer.
13 * - Scheduling: \ref sched.h,
14 * - Buffer trees: \ref buffer_tree.h,
15 * - Sideband API: \ref sideband.h,
16 * - Crypto: \ref crypt.h, \ref crypt_backend.h,
17 * - Error subsystem: \ref error.h,
18 * - Inter process communication: \ref ipc.h,
19 * - Forward error correction: \ref fec.h,
20 * - Daemons: \ref daemon.h,
21 * - Mixer API: \ref mix.h,
22 * - Interactive sessions: \ref interactive.h,
23 * - File descriptors: \ref fd.h,
24 * - Signals: \ref signal.h,
25 * - Networking: \ref net.h,
26 * - Time: \ref time.c,
27 * - Doubly linked lists: \ref list.h.
28 */
29
30 #include <netinet/in.h>
31 #include <sys/socket.h>
32 #include <signal.h>
33 #include <regex.h>
34 #include <osl.h>
35 #include <sys/types.h>
36 #include <arpa/inet.h>
37 #include <sys/un.h>
38 #include <netdb.h>
39 #include <lopsub.h>
40
41 #include "server.lsg.h"
42 #include "para.h"
43 #include "error.h"
44 #include "lsu.h"
45 #include "crypt.h"
46 #include "afh.h"
47 #include "string.h"
48 #include "afs.h"
49 #include "net.h"
50 #include "server.h"
51 #include "list.h"
52 #include "send.h"
53 #include "sched.h"
54 #include "vss.h"
55 #include "config.h"
56 #include "close_on_fork.h"
57 #include "daemon.h"
58 #include "ipc.h"
59 #include "fd.h"
60 #include "signal.h"
61 #include "user_list.h"
62 #include "color.h"
63 #include "version.h"
64
65 /** Array of error strings. */
66 DEFINE_PARA_ERRLIST;
67
68 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
69
70 /** Shut down non-authorized connections after that many seconds. */
71 #define ALARM_TIMEOUT 10
72
73 /**
74 * Pointer to shared memory area for communication between para_server
75 * and its children. Exported to vss.c, command.c and to afs.
76 */
77 struct misc_meta_data *mmd;
78
79 /**
80 * The active value for all config options of para_server.
81 *
82 * It is computed by merging the parse result of the command line options with
83 * the parse result of the config file.
84 */
85 struct lls_parse_result *server_lpr = NULL;
86
87 /* Command line options (no config file options). Used in handle_sighup(). */
88 static struct lls_parse_result *cmdline_lpr;
89
90 /**
91 * A random number used to "authenticate" the afs connection.
92 *
93 * para_server picks this number by random before it forks the afs process. The
94 * command handlers know this number as well and write it to the afs socket,
95 * together with the id of the shared memory area which contains the payload of
96 * the afs command. A local process has to know this number to abuse the afs
97 * service provided by the local socket.
98 */
99 uint32_t afs_socket_cookie;
100
101 /** The mutex protecting the shared memory area containing the mmd struct. */
102 int mmd_mutex;
103
104 /* Serializes log output. */
105 static int log_mutex;
106
107 static struct sched sched;
108 static struct signal_task *signal_task;
109
110 /** The process id of the audio file selector process. */
111 pid_t afs_pid = 0;
112
113 /* The the main server process (parent of afs and the command handlers). */
114 static pid_t server_pid;
115
116 /**
117 * Tell whether the executing process is a command handler.
118 *
119 * Cleanup on exit must be performed differently for command handlers.
120 *
121 * \return True if the pid of the executing process is neither the server pid
122 * nor the afs pid.
123 */
124 bool process_is_command_handler(void)
125 {
126 pid_t pid = getpid();
127
128 return pid != afs_pid && pid != server_pid;
129 }
130
131 /** The task responsible for server command handling. */
132 struct server_command_task {
133 unsigned num_listen_fds; /* only one by default */
134 /** TCP socket(s) on which para_server listens for connections. */
135 int *listen_fds;
136 /* File descriptor for the accepted socket. */
137 int child_fd;
138 /** Copied from para_server's main function. */
139 int argc;
140 /** Argument vector passed to para_server's main function. */
141 char **argv;
142 /** The command task structure for scheduling. */
143 struct task *task;
144 };
145
146 /**
147 * Return the list of tasks for the server process.
148 *
149 * This is called from \a com_tasks(). The helper is necessary since command
150 * handlers can not access the scheduler structure directly.
151 *
152 * \return A dynamically allocated string that must be freed by the caller.
153 */
154 char *server_get_tasks(void)
155 {
156 return get_task_list(&sched);
157 }
158
159 static void pre_log_hook(void)
160 {
161 mutex_lock(log_mutex);
162 }
163
164 static void post_log_hook(void)
165 {
166 mutex_unlock(log_mutex);
167 }
168
169 /* Setup shared memory area and init mutexes */
170 static void init_ipc_or_die(void)
171 {
172 void *shm;
173 int shmid, ret = shm_new(sizeof(struct misc_meta_data));
174
175 if (ret < 0)
176 goto err_out;
177 shmid = ret;
178 ret = shm_attach(shmid, ATTACH_RW, &shm);
179 shm_destroy(shmid);
180 if (ret < 0)
181 goto err_out;
182 mmd = shm;
183
184 ret = mutex_new();
185 if (ret < 0)
186 goto err_out;
187 mmd_mutex = ret;
188 ret = mutex_new();
189 if (ret < 0)
190 goto destroy_mmd_mutex;
191 log_mutex = ret;
192
193 mmd->num_played = 0;
194 mmd->num_commands = 0;
195 mmd->events = 0;
196 mmd->num_connects = 0;
197 mmd->active_connections = 0;
198 mmd->vss_status_flags = VSS_NEXT;
199 mmd->new_vss_status_flags = VSS_NEXT;
200 return;
201 destroy_mmd_mutex:
202 mutex_destroy(mmd_mutex);
203 err_out:
204 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
205 exit(EXIT_FAILURE);
206 }
207
208 /**
209 * (Re-)read the server configuration files.
210 *
211 * \param reload Whether config file overrides command line.
212 *
213 * This function also re-opens the logfile and the user list. On SIGHUP it is
214 * called from both server and afs context.
215 */
216 void parse_config_or_die(bool reload)
217 {
218 int ret;
219 unsigned flags = MCF_DONT_FREE;
220
221 if (server_lpr != cmdline_lpr)
222 lls_free_parse_result(server_lpr, CMD_PTR);
223 server_lpr = cmdline_lpr;
224 if (reload)
225 flags |= MCF_OVERRIDE;
226 ret = lsu_merge_config_file_options(OPT_STRING_VAL(CONFIG_FILE),
227 "server.conf", &server_lpr, CMD_PTR, server_suite, flags);
228 if (ret < 0) {
229 PARA_EMERG_LOG("failed to parse config file: %s\n",
230 para_strerror(-ret));
231 exit(EXIT_FAILURE);
232 }
233 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
234 if (OPT_GIVEN(LOGFILE)) {
235 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
236 daemon_open_log_or_die();
237 }
238 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
239 COLOR_NO, OPT_GIVEN(LOGFILE))) {
240 int i;
241 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
242 daemon_set_log_color_or_die(lls_string_val(i,
243 OPT_RESULT(LOG_COLOR)));
244 }
245 daemon_set_flag(DF_LOG_PID);
246 daemon_set_flag(DF_LOG_LL);
247 daemon_set_flag(DF_LOG_TIME);
248 if (OPT_GIVEN(LOG_TIMING))
249 daemon_set_flag(DF_LOG_TIMING);
250 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
251 if (!reload || getpid() != afs_pid) {
252 char *user_list_file;
253 if (OPT_GIVEN(USER_LIST))
254 user_list_file = para_strdup(OPT_STRING_VAL(USER_LIST));
255 else {
256 char *home = para_homedir();
257 user_list_file = make_message("%s/.paraslash/server.users", home);
258 free(home);
259 }
260 user_list_init(user_list_file);
261 free(user_list_file);
262 }
263 return;
264 }
265
266 /*
267 * called when server gets SIGHUP or when client invokes hup command.
268 */
269 static void handle_sighup(void)
270 {
271
272 PARA_NOTICE_LOG("SIGHUP\n");
273 parse_config_or_die(true);
274 if (afs_pid != 0)
275 kill(afs_pid, SIGHUP);
276 }
277
278 static int signal_post_select(struct sched *s, __a_unused void *context)
279 {
280 int ret, signum;
281
282 ret = task_get_notification(signal_task->task);
283 if (ret < 0)
284 return ret;
285 signum = para_next_signal(&s->rfds);
286 switch (signum) {
287 case 0:
288 return 0;
289 case SIGHUP:
290 handle_sighup();
291 break;
292 case SIGCHLD:
293 for (;;) {
294 pid_t pid;
295 ret = para_reap_child(&pid);
296 if (ret <= 0)
297 break;
298 if (pid != afs_pid)
299 continue;
300 PARA_EMERG_LOG("fatal: afs died\n");
301 kill(0, SIGTERM);
302 goto cleanup;
303 }
304 break;
305 /* die on sigint/sigterm. Kill all children too. */
306 case SIGINT:
307 case SIGTERM:
308 PARA_EMERG_LOG("terminating on signal %d\n", signum);
309 kill(0, SIGTERM);
310 /*
311 * We must wait for all of our children to die. For the afs
312 * process or a command handler might want to use the
313 * shared memory area and the mmd mutex. If we destroy this
314 * mutex too early and afs tries to lock the shared memory
315 * area, the call to mutex_lock() will fail and terminate the
316 * afs process. This leads to dirty osl tables.
317 */
318 PARA_INFO_LOG("waiting for child processes to die\n");
319 mutex_unlock(mmd_mutex);
320 while (wait(NULL) != -1 || errno != ECHILD)
321 ; /* still at least one child alive */
322 mutex_lock(mmd_mutex);
323 cleanup:
324 free(mmd->afd.afhi.chunk_table);
325 task_notify_all(s, E_DEADLY_SIGNAL);
326 return -E_DEADLY_SIGNAL;
327 }
328 return 0;
329 }
330
331 static void init_signal_task(void)
332 {
333 signal_task = signal_init_or_die();
334 para_install_sighandler(SIGINT);
335 para_install_sighandler(SIGTERM);
336 para_install_sighandler(SIGHUP);
337 para_install_sighandler(SIGCHLD);
338 para_sigaction(SIGPIPE, SIG_IGN);
339 add_close_on_fork_list(signal_task->fd);
340 signal_task->task = task_register(&(struct task_info) {
341 .name = "signal",
342 .pre_select = signal_pre_select,
343 .post_select = signal_post_select,
344 .context = signal_task,
345
346 }, &sched);
347 }
348
349 static void command_pre_select(struct sched *s, void *context)
350 {
351 unsigned n;
352 struct server_command_task *sct = context;
353
354 for (n = 0; n < sct->num_listen_fds; n++)
355 para_fd_set(sct->listen_fds[n], &s->rfds, &s->max_fileno);
356 }
357
358 static int command_task_accept(unsigned listen_idx, struct sched *s,
359 struct server_command_task *sct)
360 {
361 int new_fd, ret, i;
362 char *peer_name;
363 pid_t child_pid;
364 uint32_t *chunk_table;
365
366 ret = para_accept(sct->listen_fds[listen_idx], &s->rfds, NULL, 0, &new_fd);
367 if (ret <= 0)
368 goto out;
369 mmd->num_connects++;
370 mmd->active_connections++;
371 /*
372 * The chunk table is a pointer located in the mmd struct that points
373 * to dynamically allocated memory, i.e. it must be freed by the parent
374 * and the child. However, as the mmd struct is in a shared memory
375 * area, there's no guarantee that after the fork this pointer is still
376 * valid in child context. As it is not used in the child anyway, we
377 * save it to a local variable before the fork and free the memory via
378 * that copy in the child directly after the fork.
379 */
380 chunk_table = mmd->afd.afhi.chunk_table;
381 child_pid = fork();
382 if (child_pid < 0) {
383 ret = -ERRNO_TO_PARA_ERROR(errno);
384 goto out;
385 }
386 if (child_pid) {
387 /* avoid problems with non-fork-safe PRNGs */
388 unsigned char buf[16];
389 get_random_bytes_or_die(buf, sizeof(buf));
390 close(new_fd);
391 /* parent keeps accepting connections */
392 return 0;
393 }
394 peer_name = remote_name(new_fd);
395 PARA_INFO_LOG("accepted connection from %s\n", peer_name);
396 /* mmd might already have changed at this point */
397 free(chunk_table);
398 sct->child_fd = new_fd;
399 /*
400 * put info on who we are serving into argv[0] to make
401 * client ip visible in top/ps
402 */
403 for (i = sct->argc - 1; i >= 0; i--)
404 memset(sct->argv[i], 0, strlen(sct->argv[i]));
405 i = sct->argc - 1 - lls_num_inputs(cmdline_lpr);
406 sprintf(sct->argv[i], "para_server (serving %s)", peer_name);
407 /* ask other tasks to terminate */
408 task_notify_all(s, E_CHILD_CONTEXT);
409 /*
410 * After we return, the scheduler calls server_select() with a minimal
411 * timeout value, because the remaining tasks have a notification
412 * pending. Next it calls the ->post_select method of these tasks,
413 * which will return negative in view of the notification. This causes
414 * schedule() to return as there are no more runnable tasks.
415 *
416 * Note that semaphores are not inherited across a fork(), so we don't
417 * hold the lock at this point. Since server_select() drops the lock
418 * prior to calling para_select(), we need to acquire it here.
419 */
420 mutex_lock(mmd_mutex);
421 return -E_CHILD_CONTEXT;
422 out:
423 if (ret < 0)
424 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
425 return 0;
426 }
427
428 static int command_post_select(struct sched *s, void *context)
429 {
430 struct server_command_task *sct = context;
431 unsigned n;
432 int ret;
433
434 ret = task_get_notification(sct->task);
435 if (ret < 0)
436 return ret;
437 for (n = 0; n < sct->num_listen_fds; n++) {
438 ret = command_task_accept(n, s, sct);
439 if (ret < 0) {
440 free(sct->listen_fds);
441 return ret;
442 }
443 }
444 return 0;
445 }
446
447 static void init_server_command_task(struct server_command_task *sct,
448 int argc, char **argv)
449 {
450 int ret;
451 unsigned n;
452 uint32_t port = OPT_UINT32_VAL(PORT);
453
454 PARA_NOTICE_LOG("initializing tcp command socket\n");
455 sct->child_fd = -1;
456 sct->argc = argc;
457 sct->argv = argv;
458 if (!OPT_GIVEN(LISTEN_ADDRESS)) {
459 sct->num_listen_fds = 1;
460 sct->listen_fds = para_malloc(sizeof(int));
461 ret = para_listen_simple(IPPROTO_TCP, port);
462 if (ret < 0)
463 goto err;
464 sct->listen_fds[0] = ret;
465 } else {
466 sct->num_listen_fds = OPT_GIVEN(LISTEN_ADDRESS);
467 sct->listen_fds = para_malloc(sct->num_listen_fds * sizeof(int));
468 for (n = 0; n < OPT_GIVEN(LISTEN_ADDRESS); n++) {
469 const char *arg;
470 arg = lls_string_val(n, OPT_RESULT(LISTEN_ADDRESS));
471 ret = para_listen(IPPROTO_TCP, arg, port);
472 if (ret < 0)
473 goto err;
474 sct->listen_fds[n] = ret;
475 }
476 }
477 for (n = 0; n < sct->num_listen_fds; n++) {
478 ret = mark_fd_nonblocking(sct->listen_fds[n]);
479 if (ret < 0)
480 goto err;
481 /* child doesn't need the listener */
482 add_close_on_fork_list(sct->listen_fds[n]);
483 }
484
485 sct->task = task_register(&(struct task_info) {
486 .name = "server command",
487 .pre_select = command_pre_select,
488 .post_select = command_post_select,
489 .context = sct,
490 }, &sched);
491 /*
492 * Detect whether the abstract Unix domain socket space is supported,
493 * but do not create the socket. We check this once in server context
494 * so that the command handlers inherit this bit of information and
495 * don't need to check again.
496 */
497 create_local_socket(NULL);
498 return;
499 err:
500 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
501 exit(EXIT_FAILURE);
502 }
503
504 static int init_afs(int argc, char **argv)
505 {
506 int ret, afs_server_socket[2];
507 char c;
508
509 ret = socketpair(PF_UNIX, SOCK_STREAM, 0, afs_server_socket);
510 if (ret < 0)
511 exit(EXIT_FAILURE);
512 get_random_bytes_or_die((unsigned char *)&afs_socket_cookie,
513 sizeof(afs_socket_cookie));
514 afs_pid = fork();
515 if (afs_pid < 0)
516 exit(EXIT_FAILURE);
517 if (afs_pid == 0) { /* child (afs) */
518 int i;
519
520 afs_pid = getpid();
521 crypt_shutdown();
522 user_list_deplete();
523 for (i = argc - 1; i >= 0; i--)
524 memset(argv[i], 0, strlen(argv[i]));
525 i = argc - lls_num_inputs(cmdline_lpr) - 1;
526 sprintf(argv[i], "para_server (afs)");
527 close(afs_server_socket[0]);
528 afs_init(afs_server_socket[1]);
529 }
530 close(afs_server_socket[1]);
531 if (read(afs_server_socket[0], &c, 1) <= 0) {
532 PARA_EMERG_LOG("early afs exit\n");
533 exit(EXIT_FAILURE);
534 }
535 ret = mark_fd_nonblocking(afs_server_socket[0]);
536 if (ret < 0)
537 exit(EXIT_FAILURE);
538 add_close_on_fork_list(afs_server_socket[0]);
539 PARA_INFO_LOG("afs_socket: %d, afs_socket_cookie: %u\n",
540 afs_server_socket[0], (unsigned) afs_socket_cookie);
541 return afs_server_socket[0];
542 }
543
544 static void handle_help_flags(void)
545 {
546 char *help;
547 bool d = OPT_GIVEN(DETAILED_HELP);
548
549 if (d)
550 help = lls_long_help(CMD_PTR);
551 else if (OPT_GIVEN(HELP))
552 help = lls_short_help(CMD_PTR);
553 else
554 return;
555 printf("%s\n", help);
556 free(help);
557 exit(EXIT_SUCCESS);
558 }
559
560 static void server_init(int argc, char **argv, struct server_command_task *sct)
561 {
562 int ret, afs_socket, daemon_pipe = -1;
563 char *errctx;
564
565 valid_fd_012();
566 /* parse command line options */
567 ret = lls(lls_parse(argc, argv, CMD_PTR, &cmdline_lpr, &errctx));
568 if (ret < 0)
569 goto fail;
570 server_lpr = cmdline_lpr;
571 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
572 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
573 OPT_STRING_VAL(GROUP));
574 version_handle_flag("server", OPT_GIVEN(VERSION));
575 handle_help_flags();
576 parse_config_or_die(false);
577 /* become daemon */
578 if (OPT_GIVEN(DAEMON))
579 daemon_pipe = daemonize(true /* parent waits for SIGTERM */);
580 server_pid = getpid();
581 crypt_init();
582 daemon_log_welcome("server");
583 init_ipc_or_die(); /* init mmd struct, mmd and log mutex */
584 daemon_set_start_time();
585 daemon_set_hooks(pre_log_hook, post_log_hook);
586 PARA_NOTICE_LOG("initializing audio format handlers\n");
587 afh_init();
588
589 /*
590 * Although afs uses its own signal handling we must ignore SIGUSR1
591 * _before_ the afs child process gets born by init_afs() below. It's
592 * racy to do this in the child because the parent might send SIGUSR1
593 * before the child gets a chance to ignore this signal.
594 *
595 * We also have to block SIGCHLD before the afs process is created
596 * because otherwise para_server does not notice if afs dies before the
597 * SIGCHLD handler has been installed for the parent process by
598 * init_signal_task() below.
599 */
600 para_sigaction(SIGUSR1, SIG_IGN);
601 para_block_signal(SIGCHLD);
602 PARA_NOTICE_LOG("initializing the audio file selector\n");
603 afs_socket = init_afs(argc, argv);
604 init_signal_task();
605 para_unblock_signal(SIGCHLD);
606 PARA_NOTICE_LOG("initializing virtual streaming system\n");
607 vss_init(afs_socket, &sched);
608 init_server_command_task(sct, argc, argv);
609 if (daemon_pipe >= 0) {
610 if (write(daemon_pipe, "\0", 1) < 0) {
611 PARA_EMERG_LOG("daemon_pipe: %s", strerror(errno));
612 exit(EXIT_FAILURE);
613 }
614 close(daemon_pipe);
615 }
616 PARA_NOTICE_LOG("server init complete\n");
617 return;
618 fail:
619 assert(ret < 0);
620 if (errctx)
621 PARA_ERROR_LOG("%s\n", errctx);
622 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
623 exit(EXIT_FAILURE);
624 }
625
626 static void status_refresh(void)
627 {
628 static int prev_uptime = -1, prev_events = -1;
629 int uptime = daemon_get_uptime(now);
630
631 if (prev_events != mmd->events)
632 goto out;
633 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
634 goto out_inc_events;
635 if (uptime / 60 != prev_uptime / 60)
636 goto out_inc_events;
637 return;
638 out_inc_events:
639 mmd->events++;
640 out:
641 prev_uptime = uptime;
642 prev_events = mmd->events;
643 mmd->vss_status_flags = mmd->new_vss_status_flags;
644 PARA_DEBUG_LOG("%u events, forcing status update\n", mmd->events);
645 killpg(0, SIGUSR1);
646 }
647
648 static int server_select(int max_fileno, fd_set *readfds, fd_set *writefds,
649 struct timeval *timeout_tv)
650 {
651 int ret;
652
653 status_refresh();
654 mutex_unlock(mmd_mutex);
655 ret = para_select(max_fileno + 1, readfds, writefds, timeout_tv);
656 mutex_lock(mmd_mutex);
657 return ret;
658 }
659
660 /**
661 * Deallocate all lopsub parse results.
662 *
663 * The server allocates a parse result for command line options and optionally
664 * a second parse result for the effective configuration, defined by merging
665 * the command line options with the options stored in the configuration file.
666 * This function frees both structures.
667 */
668 void free_lpr(void)
669 {
670 lls_free_parse_result(server_lpr, CMD_PTR);
671 if (server_lpr != cmdline_lpr)
672 lls_free_parse_result(cmdline_lpr, CMD_PTR);
673 }
674
675 /**
676 * The main function of para_server.
677 *
678 * \param argc Usual argument count.
679 * \param argv Usual argument vector.
680 *
681 * \return EXIT_SUCCESS or EXIT_FAILURE.
682 */
683 int main(int argc, char *argv[])
684 {
685 int ret;
686 struct server_command_task server_command_task_struct,
687 *sct = &server_command_task_struct;
688
689 sched.default_timeout.tv_sec = 1;
690 sched.select_function = server_select;
691
692 server_init(argc, argv, sct);
693 mutex_lock(mmd_mutex);
694 ret = schedule(&sched);
695 /*
696 * We hold the mmd lock: it was re-acquired in server_select()
697 * after the select call.
698 */
699 mutex_unlock(mmd_mutex);
700 sched_shutdown(&sched);
701 crypt_shutdown();
702 signal_shutdown(signal_task);
703 if (!process_is_command_handler()) { /* parent (server) */
704 mutex_destroy(mmd_mutex);
705 daemon_set_hooks(NULL, NULL); /* only one process remaining */
706 mutex_destroy(log_mutex);
707 deplete_close_on_fork_list();
708 if (ret < 0)
709 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
710 } else {
711 alarm(ALARM_TIMEOUT);
712 close_listed_fds();
713 ret = handle_connect(sct->child_fd);
714 }
715 vss_shutdown();
716 shm_detach(mmd);
717 user_list_deplete();
718 free_lpr();
719 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
720 }