1 /* vi: set sw=4 ts=4: */
3 * Mini init implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Adjusted by so many folks, it's impossible to keep track.
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15 #include <sys/reboot.h>
17 /* Was a CONFIG_xxx option. A lot of people were building
18 * not fully functional init by switching it on! */
21 #define COMMAND_SIZE 256
22 #define CONSOLE_NAME_SIZE 32
23 #define MAXENV 16 /* Number of env. vars */
26 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
27 * before processes are spawned to set core file size as unlimited.
28 * This is for debugging only. Don't use this is production, unless
29 * you want core dumps lying about....
31 #define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
32 #include <sys/resource.h>
34 #define INITTAB "/etc/inittab" /* inittab file location */
36 #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
39 /* Allowed init action types */
42 /* like respawn, but wait for <Enter> to be pressed on tty: */
46 #define CTRLALTDEL 0x20
50 /* Set up a linked list of init_actions, to be read from inittab */
52 struct init_action *next;
55 char terminal[CONSOLE_NAME_SIZE];
56 char command[COMMAND_SIZE];
59 /* Static variables */
60 static struct init_action *init_action_list = NULL;
62 static const char *log_console = VC_5;
68 #if ENABLE_FEATURE_EXTRA_QUIET
71 MAYBE_CONSOLE = L_CONSOLE,
74 #ifndef RB_HALT_SYSTEM
75 RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
76 RB_ENABLE_CAD = 0x89abcdef,
78 RB_POWER_OFF = 0x4321fedc,
79 RB_AUTOBOOT = 0x01234567,
83 /* Function prototypes */
84 static void halt_reboot_pwoff(int sig) NORETURN;
86 static void waitfor(pid_t pid)
88 /* waitfor(run(x)): protect against failed fork inside run() */
92 /* Wait for any child (prevent zombies from exiting orphaned processes)
93 * but exit the loop only when specified one has exited. */
94 while (wait(NULL) != pid)
98 static void loop_forever(void) NORETURN;
99 static void loop_forever(void)
105 /* Print a message to the specified device.
106 * "where" may be bitwise-or'd from L_LOG | L_CONSOLE
107 * NB: careful, we can be called after vfork!
109 #define messageD(...) do { if (DEBUG_INIT) message(__VA_ARGS__); } while (0)
110 static void message(int where, const char *fmt, ...)
111 __attribute__ ((format(printf, 2, 3)));
112 static void message(int where, const char *fmt, ...)
114 static int log_fd = -1;
120 va_start(arguments, fmt);
121 l = vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
122 if (l > sizeof(msg) - 2)
127 if (ENABLE_FEATURE_INIT_SYSLOG) {
128 /* Log the message to syslogd */
130 /* don't print out "\r" */
131 openlog(applet_name, 0, LOG_DAEMON);
132 syslog(LOG_INFO, "init: %s", msg + 1);
140 /* Take full control of the log tty, and never close it.
141 * It's mine, all mine! Muhahahaha! */
144 log_fd = STDERR_FILENO;
146 log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
148 bb_error_msg("can't log to %s", log_console);
151 close_on_exec_on(log_fd);
156 full_write(log_fd, msg, l);
157 if (log_fd == STDERR_FILENO)
158 return; /* don't print dup messages */
162 if (where & L_CONSOLE) {
163 /* Send console messages to console so people will see them. */
164 full_write(STDERR_FILENO, msg, l);
168 /* From <linux/serial.h> */
169 struct serial_struct {
178 unsigned short close_delay;
180 char reserved_char[1];
182 unsigned short closing_wait; /* time to wait before closing */
183 unsigned short closing_wait2; /* no longer used... */
184 unsigned char *iomem_base;
185 unsigned short iomem_reg_shift;
186 unsigned int port_high;
187 unsigned long iomap_base; /* cookie passed into ioremap */
189 /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
190 uint32_t bbox_reserved[16];
192 static void console_init(void)
194 struct serial_struct sr;
197 s = getenv("CONSOLE");
199 s = getenv("console");
201 int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
203 dup2(fd, STDIN_FILENO);
204 dup2(fd, STDOUT_FILENO);
205 xmove_fd(fd, STDERR_FILENO);
207 messageD(L_LOG, "console='%s'", s);
209 /* Make sure fd 0,1,2 are not closed
210 * (so that they won't be used by future opens) */
212 // Users report problems
213 // /* Make sure init can't be blocked by writing to stderr */
214 // fcntl(STDERR_FILENO, F_SETFL, fcntl(STDERR_FILENO, F_GETFL) | O_NONBLOCK);
218 if (ioctl(STDIN_FILENO, TIOCGSERIAL, &sr) == 0) {
219 /* Force the TERM setting to vt102 for serial console
220 * if TERM is set to linux (the default) */
221 if (!s || strcmp(s, "linux") == 0)
222 putenv((char*)"TERM=vt102");
223 if (!ENABLE_FEATURE_INIT_SYSLOG)
226 putenv((char*)"TERM=linux");
229 /* Set terminal settings to reasonable defaults.
230 * NB: careful, we can be called after vfork! */
231 static void set_sane_term(void)
235 tcgetattr(STDIN_FILENO, &tty);
237 /* set control chars */
238 tty.c_cc[VINTR] = 3; /* C-c */
239 tty.c_cc[VQUIT] = 28; /* C-\ */
240 tty.c_cc[VERASE] = 127; /* C-? */
241 tty.c_cc[VKILL] = 21; /* C-u */
242 tty.c_cc[VEOF] = 4; /* C-d */
243 tty.c_cc[VSTART] = 17; /* C-q */
244 tty.c_cc[VSTOP] = 19; /* C-s */
245 tty.c_cc[VSUSP] = 26; /* C-z */
247 /* use line discipline 0 */
250 /* Make it be sane */
251 tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
252 tty.c_cflag |= CREAD | HUPCL | CLOCAL;
255 tty.c_iflag = ICRNL | IXON | IXOFF;
258 tty.c_oflag = OPOST | ONLCR;
262 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
264 tcsetattr_stdin_TCSANOW(&tty);
267 /* Open the new terminal device.
268 * NB: careful, we can be called after vfork! */
269 static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
271 /* empty tty_name means "use init's tty", else... */
275 /* fd can be only < 0 or 0: */
276 fd = device_open(tty_name, O_RDWR);
278 message(L_LOG | L_CONSOLE, "can't open %s: %s",
279 tty_name, strerror(errno));
284 /* NB: we don't reach this if we were called after vfork.
285 * Thus halt_reboot_pwoff() itself need not be vfork-safe. */
286 halt_reboot_pwoff(SIGUSR1); /* halt the system */
288 dup2(STDIN_FILENO, STDOUT_FILENO);
289 dup2(STDIN_FILENO, STDERR_FILENO);
294 /* Wrapper around exec:
295 * Takes string (max COMMAND_SIZE chars).
296 * If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'.
297 * Otherwise splits words on whitespace, deals with leading dash,
298 * and uses plain exec().
299 * NB: careful, we can be called after vfork!
301 static void init_exec(const char *command)
303 char *cmd[COMMAND_SIZE / 2];
304 char buf[COMMAND_SIZE + 6]; /* COMMAND_SIZE+strlen("exec ")+1 */
305 int dash = (command[0] == '-' /* maybe? && command[1] == '/' */);
307 /* See if any special /bin/sh requiring characters are present */
308 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
309 strcpy(buf, "exec ");
310 strcpy(buf + 5, command + dash); /* excluding "-" */
311 /* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */
312 cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash);
313 cmd[1] = (char*)"-c";
317 /* Convert command (char*) into cmd (char**, one word per string) */
320 next = strcpy(buf, command); /* including "-" */
321 while ((word = strsep(&next, " \t")) != NULL) {
322 if (*word != '\0') { /* not two spaces/tabs together? */
329 /* If we saw leading "-", it is interactive shell.
330 * Try harder to give it a controlling tty.
331 * And skip "-" in actual exec call. */
333 /* _Attempt_ to make stdin a controlling tty. */
334 if (ENABLE_FEATURE_INIT_SCTTY)
335 ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/);
337 BB_EXECVP(cmd[0] + dash, cmd);
338 message(L_LOG | L_CONSOLE, "cannot run '%s': %s", cmd[0], strerror(errno));
339 /* returns if execvp fails */
342 /* Used only by run_actions */
343 static pid_t run(const struct init_action *a)
346 sigset_t nmask, omask;
348 /* Block sigchild while forking (why?) */
350 sigaddset(&nmask, SIGCHLD);
351 sigprocmask(SIG_BLOCK, &nmask, &omask);
352 if (BB_MMU && (a->action_type & ASKFIRST))
356 sigprocmask(SIG_SETMASK, &omask, NULL);
359 message(L_LOG | L_CONSOLE, "can't fork");
365 /* Reset signal handlers that were set by the parent process */
378 /* Create a new session and make ourself the process
382 /* Open the new terminal device */
383 open_stdio_to_tty(a->terminal, 1 /* - exit if open fails */);
385 // NB: do not enable unless you change vfork to fork above
386 #ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
387 /* If the init Action requires us to wait, then force the
388 * supplied terminal to be the controlling tty. */
389 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
390 /* Now fork off another process to just hang around */
393 message(L_LOG | L_CONSOLE, "can't fork");
398 /* Parent - wait till the child is done */
404 signal(SIGCHLD, SIG_DFL);
407 /* See if stealing the controlling tty back is necessary */
408 if (tcgetpgrp(0) != getpid())
411 /* Use a temporary process to steal the controlling tty. */
414 message(L_LOG | L_CONSOLE, "can't fork");
419 ioctl(0, TIOCSCTTY, 1);
425 /* Child - fall though to actually execute things */
429 /* NB: on NOMMU we can't wait for input in child, so
430 * "askfirst" will work the same as "respawn". */
431 if (BB_MMU && (a->action_type & ASKFIRST)) {
432 static const char press_enter[] ALIGN1 =
433 #ifdef CUSTOMIZED_BANNER
434 #include CUSTOMIZED_BANNER
436 "\nPlease press Enter to activate this console. ";
439 * Save memory by not exec-ing anything large (like a shell)
440 * before the user wants it. This is critical if swap is not
441 * enabled and the system has low memory. Generally this will
442 * be run on the second virtual console, and the first will
443 * be allowed to start a shell or whatever an init script
446 messageD(L_LOG, "waiting for enter to start '%s'"
447 "(pid %d, tty '%s')\n",
448 a->command, getpid(), a->terminal);
449 full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1);
450 while (safe_read(STDIN_FILENO, &c, 1) == 1 && c != '\n')
454 if (ENABLE_FEATURE_INIT_COREDUMPS) {
456 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
458 limit.rlim_cur = RLIM_INFINITY;
459 limit.rlim_max = RLIM_INFINITY;
460 setrlimit(RLIMIT_CORE, &limit);
464 /* Log the process name and args */
465 message(L_LOG, "starting pid %d, tty '%s': '%s'",
466 getpid(), a->terminal, a->command);
468 /* Now run it. The new program will take over this PID,
469 * so nothing further in init.c should be run. */
470 init_exec(a->command);
471 /* We're still here? Some error happened. */
475 static void delete_init_action(struct init_action *action)
477 struct init_action *a, *b = NULL;
479 for (a = init_action_list; a; b = a, a = a->next) {
482 init_action_list = a->next;
492 /* Run all commands of a particular type */
493 static void run_actions(int action_type)
495 struct init_action *a, *tmp;
497 for (a = init_action_list; a; a = tmp) {
499 if (a->action_type & action_type) {
500 // Pointless: run() will error out if open of device fails.
501 ///* a->terminal of "" means "init's console" */
502 //if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
503 // //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
504 // delete_init_action(a);
506 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
508 delete_init_action(a);
509 } else if (a->action_type & ONCE) {
511 delete_init_action(a);
512 } else if (a->action_type & (RESPAWN | ASKFIRST)) {
513 /* Only run stuff with pid==0. If they have
514 * a pid, that means it is still running */
523 static void init_reboot(unsigned long magic)
526 /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
527 * linux/kernel/sys.c, which can cause the machine to panic when
528 * the init process is killed.... */
530 if (pid == 0) { /* child */
537 static void kill_all_processes(void)
539 /* run everything to be run at "shutdown". This is done _prior_
540 * to killing everything, in case people wish to use scripts to
541 * shut things down gracefully... */
542 run_actions(SHUTDOWN);
544 /* first disable all our signals */
545 sigprocmask_allsigs(SIG_BLOCK);
547 message(L_CONSOLE | L_LOG, "The system is going down NOW!");
549 /* Allow Ctrl-Alt-Del to reboot system. */
550 init_reboot(RB_ENABLE_CAD);
552 /* Send signals to every process _except_ pid 1 */
553 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
558 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
564 static void halt_reboot_pwoff(int sig)
566 const char *m = "halt";
569 kill_all_processes();
572 if (sig == SIGTERM) {
575 } else if (sig == SIGUSR2) {
579 message(L_CONSOLE | L_LOG, "Requesting system %s", m);
580 /* allow time for last message to reach serial console */
586 /* Handler for QUIT - exec "restart" action,
587 * else (no such action defined) do nothing */
588 static void exec_restart_action(int sig UNUSED_PARAM)
590 struct init_action *a;
592 for (a = init_action_list; a; a = a->next) {
593 if (a->action_type & RESTART) {
594 kill_all_processes();
596 /* unblock all signals (blocked in kill_all_processes()) */
597 sigprocmask_allsigs(SIG_UNBLOCK);
599 /* Open the new terminal device */
600 open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
602 messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
603 init_exec(a->command);
605 init_reboot(RB_HALT_SYSTEM);
611 static void ctrlaltdel_signal(int sig UNUSED_PARAM)
613 run_actions(CTRLALTDEL);
616 /* The SIGCONT handler is set to record_signo().
617 * It just sets bb_got_signal = SIGCONT. */
619 /* The SIGSTOP & SIGTSTP handler */
620 static void stop_handler(int sig UNUSED_PARAM)
622 int saved_errno = errno;
625 while (bb_got_signal == 0)
631 static void new_init_action(uint8_t action_type, const char *command, const char *cons)
633 struct init_action *a, *last;
636 // if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
639 /* Append to the end of the list */
640 for (a = last = init_action_list; a; a = a->next) {
641 /* don't enter action if it's already in the list,
642 * but do overwrite existing actions */
643 if ((strcmp(a->command, command) == 0)
644 && (strcmp(a->terminal, cons) == 0)
646 a->action_type = action_type;
652 a = xzalloc(sizeof(*a));
656 init_action_list = a;
658 a->action_type = action_type;
659 safe_strncpy(a->command, command, sizeof(a->command));
660 safe_strncpy(a->terminal, cons, sizeof(a->terminal));
661 messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
662 a->command, a->action_type, a->terminal);
665 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
666 * then parse_inittab() simply adds in some default
667 * actions(i.e., runs INIT_SCRIPT and then starts a pair
668 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
669 * _is_ defined, but /etc/inittab is missing, this
670 * results in the same set of default behaviors.
672 static void parse_inittab(void)
675 /* order must correspond to SYSINIT..RESTART constants */
676 static const char actions[] ALIGN1 =
677 "sysinit\0""respawn\0""askfirst\0""wait\0""once\0"
678 "ctrlaltdel\0""shutdown\0""restart\0";
680 parser_t *parser = config_open2(INITTAB, fopen_for_read);
681 /* No inittab file -- set up some default behavior */
682 if (parser == NULL) {
683 /* Reboot on Ctrl-Alt-Del */
684 new_init_action(CTRLALTDEL, "reboot", "");
685 /* Umount all filesystems on halt/reboot */
686 new_init_action(SHUTDOWN, "umount -a -r", "");
687 /* Swapoff on halt/reboot */
688 if (ENABLE_SWAPONOFF)
689 new_init_action(SHUTDOWN, "swapoff -a", "");
690 /* Prepare to restart init when a QUIT is received */
691 new_init_action(RESTART, "init", "");
692 /* Askfirst shell on tty1-4 */
693 new_init_action(ASKFIRST, bb_default_login_shell, "");
694 //TODO: VC_1 instead of ""? "" is console -> ctty problems -> angry users
695 new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
696 new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
697 new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
699 new_init_action(SYSINIT, INIT_SCRIPT, "");
702 /* optional_tty:ignored_runlevel:action:command
703 * Delims are not to be collapsed and need exactly 4 tokens
705 while (config_read(parser, token, 4, 0, "#:",
706 PARSE_NORMAL & ~(PARSE_TRIM | PARSE_COLLAPSE))) {
708 char *tty = token[0];
710 if (!token[3]) /* less than 4 tokens */
712 action = index_in_strings(actions, token[2]);
713 if (action < 0 || !token[3][0]) /* token[3]: command */
715 /* turn .*TTY -> /dev/TTY */
717 if (strncmp(tty, "/dev/", 5) == 0)
719 tty = concat_path_file("/dev/", tty);
721 new_init_action(1 << action, token[3], tty);
726 message(L_LOG | L_CONSOLE, "Bad inittab entry at line %d",
729 config_close(parser);
732 #if ENABLE_FEATURE_USE_INITTAB
733 static void reload_signal(int sig UNUSED_PARAM)
735 struct init_action *a, *tmp;
737 message(L_LOG, "reloading /etc/inittab");
739 /* disable old entrys */
740 for (a = init_action_list; a; a = a->next) {
741 a->action_type = ONCE;
746 if (ENABLE_FEATURE_KILL_REMOVED) {
747 /* Be nice and send SIGTERM first */
748 for (a = init_action_list; a; a = a->next) {
750 if ((a->action_type & ONCE) && pid != 0) {
754 #if CONFIG_FEATURE_KILL_DELAY
755 /* NB: parent will wait in NOMMU case */
756 if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
757 sleep(CONFIG_FEATURE_KILL_DELAY);
758 for (a = init_action_list; a; a = a->next) {
760 if ((a->action_type & ONCE) && pid != 0) {
769 /* remove unused entrys */
770 for (a = init_action_list; a; a = tmp) {
772 if ((a->action_type & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
773 delete_init_action(a);
776 run_actions(RESPAWN | ASKFIRST);
780 int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
781 int init_main(int argc UNUSED_PARAM, char **argv)
783 struct init_action *a;
786 die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
788 if (argv[1] && !strcmp(argv[1], "-q")) {
789 return kill(1, SIGHUP);
793 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
795 && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
799 /* Set up sig handlers -- be sure to
800 * clear all of these in run() */
801 signal(SIGQUIT, exec_restart_action);
803 + (1 << SIGUSR1) /* halt */
804 + (1 << SIGUSR2) /* poweroff */
805 + (1 << SIGTERM) /* reboot */
806 , halt_reboot_pwoff);
807 signal(SIGINT, ctrlaltdel_signal);
808 signal(SIGCONT, record_signo);
814 /* Turn off rebooting via CTL-ALT-DEL -- we get a
815 * SIGINT on CAD so we can shut things down gracefully... */
816 init_reboot(RB_DISABLE_CAD);
819 /* Figure out where the default console should be */
825 /* Make sure environs is set to something sane */
826 putenv((char *) "HOME=/");
827 putenv((char *) bb_PATH_root_path);
828 putenv((char *) "SHELL=/bin/sh");
829 putenv((char *) "USER=root"); /* needed? why? */
832 xsetenv("RUNLEVEL", argv[1]);
835 message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
837 /* Make sure there is enough memory to do something useful. */
838 if (ENABLE_SWAPONOFF) {
841 if (!sysinfo(&info) &&
842 (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
844 message(L_CONSOLE, "Low memory, forcing swapon");
845 /* swapon -a requires /proc typically */
846 new_init_action(SYSINIT, "mount -t proc proc /proc", "");
847 /* Try to turn on swap */
848 new_init_action(SYSINIT, "swapon -a", "");
849 run_actions(SYSINIT); /* wait and removing */
853 /* Check if we are supposed to be in single user mode */
855 && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
857 /* ??? shouldn't we set RUNLEVEL="b" here? */
858 /* Start a shell on console */
859 new_init_action(RESPAWN, bb_default_login_shell, "");
861 /* Not in single user mode -- see what inittab says */
863 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
864 * then parse_inittab() simply adds in some default
865 * actions(i.e., runs INIT_SCRIPT and then starts a pair
866 * of "askfirst" shells */
871 if (getenv("SELINUX_INIT") == NULL) {
874 putenv((char*)"SELINUX_INIT=YES");
875 if (selinux_init_load_policy(&enforce) == 0) {
876 BB_EXECVP(argv[0], argv);
877 } else if (enforce > 0) {
878 /* SELinux in enforcing mode but load_policy failed */
879 message(L_CONSOLE, "cannot load SELinux Policy. "
880 "Machine is in enforcing mode. Halting now.");
884 #endif /* CONFIG_SELINUX */
886 /* Make the command line just say "init" - thats all, nothing else */
887 strncpy(argv[0], "init", strlen(argv[0]));
888 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
890 memset(*argv, 0, strlen(*argv));
892 /* Now run everything that needs to be run */
894 /* First run the sysinit command */
895 run_actions(SYSINIT);
897 /* Next run anything that wants to block */
900 /* Next run anything to be run only once */
903 /* Redefine SIGHUP to reread /etc/inittab */
904 #if ENABLE_FEATURE_USE_INITTAB
905 signal(SIGHUP, reload_signal);
907 signal(SIGHUP, SIG_IGN);
910 /* Now run the looping stuff for the rest of forever */
912 /* run the respawn/askfirst stuff */
913 run_actions(RESPAWN | ASKFIRST);
915 /* Don't consume all CPU time -- sleep a bit */
918 /* Wait for any child process to exit */
921 /* Find out who died and clean up their corpse */
922 for (a = init_action_list; a; a = a->next) {
923 if (a->pid == wpid) {
924 /* Set the pid to 0 so that the process gets
925 * restarted by run_actions() */
927 message(L_LOG, "process '%s' (pid %d) exited. "
928 "Scheduling for restart.",
932 /* see if anyone else is waiting to be reaped */
933 wpid = wait_any_nohang(NULL);