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 #define COMMAND_SIZE 256
18 #define CONSOLE_NAME_SIZE 32
19 #define MAXENV 16 /* Number of env. vars */
22 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
23 * before processes are spawned to set core file size as unlimited.
24 * This is for debugging only. Don't use this is production, unless
25 * you want core dumps lying about....
27 #define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
28 #include <sys/resource.h>
30 #define INITTAB "/etc/inittab" /* inittab file location */
32 #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
35 /* Allowed init action types */
38 #define ASKFIRST 0x004
41 #define CTRLALTDEL 0x020
42 #define SHUTDOWN 0x040
45 #define STR_SYSINIT "\x01"
46 #define STR_RESPAWN "\x02"
47 #define STR_ASKFIRST "\x04"
48 #define STR_WAIT "\x08"
49 #define STR_ONCE "\x10"
50 #define STR_CTRLALTDEL "\x20"
51 #define STR_SHUTDOWN "\x40"
52 #define STR_RESTART "\x80"
54 /* Set up a linked list of init_actions, to be read from inittab */
56 struct init_action *next;
59 char terminal[CONSOLE_NAME_SIZE];
60 char command[COMMAND_SIZE];
63 /* Static variables */
64 static struct init_action *init_action_list = NULL;
66 static const char *log_console = VC_5;
67 static sig_atomic_t got_cont = 0;
73 #if ENABLE_FEATURE_EXTRA_QUIET
76 MAYBE_CONSOLE = L_CONSOLE,
79 #ifndef RB_HALT_SYSTEM
80 RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
81 RB_ENABLE_CAD = 0x89abcdef,
83 RB_POWER_OFF = 0x4321fedc,
84 RB_AUTOBOOT = 0x01234567,
88 static const char *const environment[] = {
96 /* Function prototypes */
97 static void delete_init_action(struct init_action *a);
98 static void halt_reboot_pwoff(int sig) ATTRIBUTE_NORETURN;
100 static void waitfor(pid_t pid)
102 /* waitfor(run(x)): protect against failed fork inside run() */
106 /* Wait for any child (prevent zombies from exiting orphaned processes)
107 * but exit the loop only when specified one has exited. */
108 while (wait(NULL) != pid)
112 static void loop_forever(void) ATTRIBUTE_NORETURN;
113 static void loop_forever(void)
119 /* Print a message to the specified device.
120 * "where" may be bitwise-or'd from L_LOG | L_CONSOLE
121 * NB: careful, we can be called after vfork!
123 #define messageD(...) do { if (ENABLE_DEBUG_INIT) message(__VA_ARGS__); } while (0)
124 static void message(int where, const char *fmt, ...)
125 __attribute__ ((format(printf, 2, 3)));
126 static void message(int where, const char *fmt, ...)
128 static int log_fd = -1;
134 va_start(arguments, fmt);
135 vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
137 msg[sizeof(msg) - 2] = '\0';
140 if (ENABLE_FEATURE_INIT_SYSLOG) {
141 /* Log the message to syslogd */
144 openlog(applet_name, 0, LOG_DAEMON);
145 syslog(LOG_INFO, "init: %s", msg + 1);
153 /* Take full control of the log tty, and never close it.
154 * It's mine, all mine! Muhahahaha! */
159 log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
161 bb_error_msg("can't log to %s", log_console);
164 close_on_exec_on(log_fd);
169 full_write(log_fd, msg, l);
171 return; /* don't print dup messages */
175 if (where & L_CONSOLE) {
176 /* Send console messages to console so people will see them. */
177 full_write(2, msg, l);
181 /* From <linux/serial.h> */
182 struct serial_struct {
191 unsigned short close_delay;
193 char reserved_char[1];
195 unsigned short closing_wait; /* time to wait before closing */
196 unsigned short closing_wait2; /* no longer used... */
197 unsigned char *iomem_base;
198 unsigned short iomem_reg_shift;
199 unsigned int port_high;
200 unsigned long iomap_base; /* cookie passed into ioremap */
202 /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
203 uint32_t bbox_reserved[16];
205 static void console_init(void)
207 struct serial_struct sr;
210 s = getenv("CONSOLE");
211 if (!s) s = getenv("console");
213 int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
218 while (fd > 2) close(fd--);
220 messageD(L_LOG, "console='%s'", s);
222 /* Make sure fd 0,1,2 are not closed */
227 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
228 /* Force the TERM setting to vt102 for serial console
229 * if TERM is set to linux (the default) */
230 if (!s || strcmp(s, "linux") == 0)
231 putenv((char*)"TERM=vt102");
232 if (!ENABLE_FEATURE_INIT_SYSLOG)
235 putenv((char*)"TERM=linux");
238 /* Set terminal settings to reasonable defaults.
239 * NB: careful, we can be called after vfork! */
240 static void set_sane_term(void)
244 tcgetattr(STDIN_FILENO, &tty);
246 /* set control chars */
247 tty.c_cc[VINTR] = 3; /* C-c */
248 tty.c_cc[VQUIT] = 28; /* C-\ */
249 tty.c_cc[VERASE] = 127; /* C-? */
250 tty.c_cc[VKILL] = 21; /* C-u */
251 tty.c_cc[VEOF] = 4; /* C-d */
252 tty.c_cc[VSTART] = 17; /* C-q */
253 tty.c_cc[VSTOP] = 19; /* C-s */
254 tty.c_cc[VSUSP] = 26; /* C-z */
256 /* use line dicipline 0 */
259 /* Make it be sane */
260 tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
261 tty.c_cflag |= CREAD | HUPCL | CLOCAL;
264 tty.c_iflag = ICRNL | IXON | IXOFF;
267 tty.c_oflag = OPOST | ONLCR;
271 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
273 tcsetattr(STDIN_FILENO, TCSANOW, &tty);
276 /* Open the new terminal device.
277 * NB: careful, we can be called after vfork! */
278 static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
280 /* empty tty_name means "use init's tty", else... */
284 /* fd can be only < 0 or 0: */
285 fd = device_open(tty_name, O_RDWR);
287 message(L_LOG | L_CONSOLE, "Can't open %s: %s",
288 tty_name, strerror(errno));
291 if (ENABLE_DEBUG_INIT)
293 /* NB: we don't reach this if we were called after vfork.
294 * Thus halt_reboot_pwoff() itself need not be vfork-safe. */
295 halt_reboot_pwoff(SIGUSR1); /* halt the system */
303 /* Wrapper around exec:
304 * Takes string (max COMMAND_SIZE chars).
305 * If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'.
306 * Otherwise splits words on whitespace, deals with leading dash,
307 * and uses plain exec().
308 * NB: careful, we can be called after vfork!
310 static void init_exec(const char *command)
312 char *cmd[COMMAND_SIZE / 2];
313 char buf[COMMAND_SIZE + 6]; /* COMMAND_SIZE+strlen("exec ")+1 */
314 int dash = (command[0] == '-' /* maybe? && command[1] == '/' */);
316 /* See if any special /bin/sh requiring characters are present */
317 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
318 strcpy(buf, "exec ");
319 strcpy(buf + 5, command + dash); /* excluding "-" */
320 /* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */
321 cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash);
322 cmd[1] = (char*)"-c";
326 /* Convert command (char*) into cmd (char**, one word per string) */
329 next = strcpy(buf, command); /* including "-" */
330 while ((word = strsep(&next, " \t")) != NULL) {
331 if (*word != '\0') { /* not two spaces/tabs together? */
338 /* If we saw leading "-", it is interactive shell.
339 * Try harder to give it a controlling tty.
340 * And skip "-" in actual exec call. */
342 /* _Attempt_ to make stdin a controlling tty. */
343 if (ENABLE_FEATURE_INIT_SCTTY)
344 ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/);
346 BB_EXECVP(cmd[0] + dash, cmd);
347 message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
348 cmd[0], strerror(errno));
349 /* returns if execvp fails */
352 /* Used only by run_actions */
353 static pid_t run(const struct init_action *a)
356 sigset_t nmask, omask;
358 /* Block sigchild while forking (why?) */
360 sigaddset(&nmask, SIGCHLD);
361 sigprocmask(SIG_BLOCK, &nmask, &omask);
363 sigprocmask(SIG_SETMASK, &omask, NULL);
366 message(L_LOG | L_CONSOLE, "Can't fork");
372 /* Reset signal handlers that were set by the parent process */
385 /* Create a new session and make ourself the process
389 /* Open the new terminal device */
390 open_stdio_to_tty(a->terminal, 1 /* - exit if open fails */);
392 // NB: do not enable unless you change vfork to fork above
393 #ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
394 /* If the init Action requires us to wait, then force the
395 * supplied terminal to be the controlling tty. */
396 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
397 /* Now fork off another process to just hang around */
400 message(L_LOG | L_CONSOLE, "Can't fork");
405 /* Parent - wait till the child is done */
411 signal(SIGCHLD, SIG_DFL);
414 /* See if stealing the controlling tty back is necessary */
415 if (tcgetpgrp(0) != getpid())
418 /* Use a temporary process to steal the controlling tty. */
421 message(L_LOG | L_CONSOLE, "Can't fork");
426 ioctl(0, TIOCSCTTY, 1);
433 /* Child - fall though to actually execute things */
437 /* NB: on NOMMU we can't wait for input in child */
438 if (BB_MMU && (a->action_type & ASKFIRST)) {
439 static const char press_enter[] ALIGN1 =
440 #ifdef CUSTOMIZED_BANNER
441 #include CUSTOMIZED_BANNER
443 "\nPlease press Enter to activate this console. ";
446 * Save memory by not exec-ing anything large (like a shell)
447 * before the user wants it. This is critical if swap is not
448 * enabled and the system has low memory. Generally this will
449 * be run on the second virtual console, and the first will
450 * be allowed to start a shell or whatever an init script
453 messageD(L_LOG, "waiting for enter to start '%s'"
454 "(pid %d, tty '%s')\n",
455 a->command, getpid(), a->terminal);
456 full_write(1, press_enter, sizeof(press_enter) - 1);
457 while (safe_read(0, &c, 1) == 1 && c != '\n')
461 if (ENABLE_FEATURE_INIT_COREDUMPS) {
463 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
465 limit.rlim_cur = RLIM_INFINITY;
466 limit.rlim_max = RLIM_INFINITY;
467 setrlimit(RLIMIT_CORE, &limit);
471 /* Log the process name and args */
472 message(L_LOG, "starting pid %d, tty '%s': '%s'",
473 getpid(), a->terminal, a->command);
475 /* Now run it. The new program will take over this PID,
476 * so nothing further in init.c should be run. */
477 init_exec(a->command);
478 /* We're still here? Some error happened. */
482 /* Run all commands of a particular type */
483 static void run_actions(int action_type)
485 struct init_action *a, *tmp;
487 for (a = init_action_list; a; a = tmp) {
489 if (a->action_type == action_type) {
490 // Pointless: run() will error out if open of device fails.
491 ///* a->terminal of "" means "init's console" */
492 //if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
493 // //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
494 // delete_init_action(a);
496 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
498 delete_init_action(a);
499 } else if (a->action_type & ONCE) {
501 delete_init_action(a);
502 } else if (a->action_type & (RESPAWN | ASKFIRST)) {
503 /* Only run stuff with pid==0. If they have
504 * a pid, that means it is still running */
513 static void init_reboot(unsigned long magic)
516 /* We have to fork here, since the kernel calls do_exit(0) in
517 * linux/kernel/sys.c, which can cause the machine to panic when
518 * the init process is killed.... */
520 if (pid == 0) { /* child */
527 static void kill_all_processes(void)
529 /* run everything to be run at "shutdown". This is done _prior_
530 * to killing everything, in case people wish to use scripts to
531 * shut things down gracefully... */
532 run_actions(SHUTDOWN);
534 /* first disable all our signals */
535 sigprocmask_allsigs(SIG_BLOCK);
537 message(L_CONSOLE | L_LOG, "The system is going down NOW!");
539 /* Allow Ctrl-Alt-Del to reboot system. */
540 init_reboot(RB_ENABLE_CAD);
542 /* Send signals to every process _except_ pid 1 */
543 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
548 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
554 static void halt_reboot_pwoff(int sig)
559 kill_all_processes();
563 if (sig == SIGTERM) {
566 } else if (sig == SIGUSR2) {
570 message(L_CONSOLE | L_LOG, "Requesting system %s", m);
571 /* allow time for last message to reach serial console */
577 /* Handler for QUIT - exec "restart" action,
578 * else (no such action defined) do nothing */
579 static void exec_restart_action(int sig ATTRIBUTE_UNUSED)
581 struct init_action *a;
583 for (a = init_action_list; a; a = a->next) {
584 if (a->action_type & RESTART) {
585 kill_all_processes();
587 /* unblock all signals (blocked in kill_all_processes()) */
588 sigprocmask_allsigs(SIG_UNBLOCK);
590 /* Open the new terminal device */
591 open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
593 messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
594 init_exec(a->command);
596 init_reboot(RB_HALT_SYSTEM);
602 static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
604 run_actions(CTRLALTDEL);
607 /* The SIGSTOP & SIGTSTP handler */
608 static void stop_handler(int sig ATTRIBUTE_UNUSED)
610 int saved_errno = errno;
619 /* The SIGCONT handler */
620 static void cont_handler(int sig ATTRIBUTE_UNUSED)
625 static void new_init_action(uint8_t action_type, const char *command, const char *cons)
627 struct init_action *a, *last;
630 // if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
633 /* Append to the end of the list */
634 for (a = last = init_action_list; a; a = a->next) {
635 /* don't enter action if it's already in the list,
636 * but do overwrite existing actions */
637 if ((strcmp(a->command, command) == 0)
638 && (strcmp(a->terminal, cons) == 0)
640 a->action_type = action_type;
646 a = xzalloc(sizeof(*a));
650 init_action_list = a;
652 a->action_type = action_type;
653 safe_strncpy(a->command, command, sizeof(a->command));
654 safe_strncpy(a->terminal, cons, sizeof(a->terminal));
655 messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
656 a->command, a->action_type, a->terminal);
659 static void delete_init_action(struct init_action *action)
661 struct init_action *a, *b = NULL;
663 for (a = init_action_list; a; b = a, a = a->next) {
666 init_action_list = a->next;
676 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
677 * then parse_inittab() simply adds in some default
678 * actions(i.e., runs INIT_SCRIPT and then starts a pair
679 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
680 * _is_ defined, but /etc/inittab is missing, this
681 * results in the same set of default behaviors.
683 static void parse_inittab(void)
686 char buf[COMMAND_SIZE];
688 if (ENABLE_FEATURE_USE_INITTAB)
689 file = fopen(INITTAB, "r");
693 /* No inittab file -- set up some default behavior */
695 /* Reboot on Ctrl-Alt-Del */
696 new_init_action(CTRLALTDEL, "reboot", "");
697 /* Umount all filesystems on halt/reboot */
698 new_init_action(SHUTDOWN, "umount -a -r", "");
699 /* Swapoff on halt/reboot */
700 if (ENABLE_SWAPONOFF)
701 new_init_action(SHUTDOWN, "swapoff -a", "");
702 /* Prepare to restart init when a QUIT is received */
703 new_init_action(RESTART, "init", "");
704 /* Askfirst shell on tty1-4 */
705 new_init_action(ASKFIRST, bb_default_login_shell, "");
706 new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
707 new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
708 new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
710 new_init_action(SYSINIT, INIT_SCRIPT, "");
715 while (fgets(buf, COMMAND_SIZE, file) != NULL) {
716 static const char actions[] =
717 STR_SYSINIT "sysinit\0"
718 STR_RESPAWN "respawn\0"
719 STR_ASKFIRST "askfirst\0"
722 STR_CTRLALTDEL "ctrlaltdel\0"
723 STR_SHUTDOWN "shutdown\0"
724 STR_RESTART "restart\0"
726 char tmpConsole[CONSOLE_NAME_SIZE];
727 char *id, *runlev, *action, *command;
730 /* Skip leading spaces */
731 id = skip_whitespace(buf);
732 /* Trim the trailing '\n' */
733 *strchrnul(id, '\n') = '\0';
734 /* Skip the line if it is a comment */
735 if (*id == '#' || *id == '\0')
738 /* Line is: "id:runlevel_ignored:action:command" */
739 runlev = strchr(id, ':');
740 if (runlev == NULL /*|| runlev[1] == '\0' - not needed */)
742 action = strchr(runlev + 1, ':');
743 if (action == NULL /*|| action[1] == '\0' - not needed */)
745 command = strchr(action + 1, ':');
746 if (command == NULL || command[1] == '\0')
749 *command = '\0'; /* action => ":action\0" now */
750 for (a = actions; a[0]; a += strlen(a) + 1) {
751 if (strcmp(a + 1, action + 1) == 0) {
754 if (strncmp(id, "/dev/", 5) == 0)
756 strcpy(tmpConsole, "/dev/");
757 safe_strncpy(tmpConsole + 5, id,
758 sizeof(tmpConsole) - 5);
761 new_init_action((uint8_t)a[0], command + 1, id);
766 /* Choke on an unknown action */
768 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", id);
774 static void reload_signal(int sig ATTRIBUTE_UNUSED)
776 struct init_action *a, *tmp;
778 message(L_LOG, "reloading /etc/inittab");
780 /* disable old entrys */
781 for (a = init_action_list; a; a = a->next) {
782 a->action_type = ONCE;
787 if (ENABLE_FEATURE_KILL_REMOVED) {
788 /* Be nice and send SIGTERM first */
789 for (a = init_action_list; a; a = a->next) {
791 if ((a->action_type & ONCE) && pid != 0) {
795 #if CONFIG_FEATURE_KILL_DELAY
796 /* NB: parent will wait in NOMMU case */
797 if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
798 sleep(CONFIG_FEATURE_KILL_DELAY);
799 for (a = init_action_list; a; a = a->next) {
801 if ((a->action_type & ONCE) && pid != 0) {
810 /* remove unused entrys */
811 for (a = init_action_list; a; a = tmp) {
813 if ((a->action_type & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
814 delete_init_action(a);
817 run_actions(RESPAWN);
820 int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
821 int init_main(int argc, char **argv)
823 struct init_action *a;
826 die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
828 if (argc > 1 && !strcmp(argv[1], "-q")) {
829 return kill(1, SIGHUP);
832 if (!ENABLE_DEBUG_INIT) {
833 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
835 && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
839 /* Set up sig handlers -- be sure to
840 * clear all of these in run() */
841 signal(SIGQUIT, exec_restart_action);
843 + (1 << SIGUSR1) /* halt */
844 + (1 << SIGUSR2) /* poweroff */
845 + (1 << SIGTERM) /* reboot */
846 , halt_reboot_pwoff);
847 signal(SIGINT, ctrlaltdel_signal);
848 signal(SIGCONT, cont_handler);
854 /* Turn off rebooting via CTL-ALT-DEL -- we get a
855 * SIGINT on CAD so we can shut things down gracefully... */
856 init_reboot(RB_DISABLE_CAD);
859 /* Figure out where the default console should be */
865 const char *const *e;
866 /* Make sure environs is set to something sane */
867 for (e = environment; *e; e++)
871 if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
874 message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
876 /* Make sure there is enough memory to do something useful. */
877 if (ENABLE_SWAPONOFF) {
880 if (!sysinfo(&info) &&
881 (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
883 message(L_CONSOLE, "Low memory, forcing swapon");
884 /* swapon -a requires /proc typically */
885 new_init_action(SYSINIT, "mount -t proc proc /proc", "");
886 /* Try to turn on swap */
887 new_init_action(SYSINIT, "swapon -a", "");
888 run_actions(SYSINIT); /* wait and removing */
892 /* Check if we are supposed to be in single user mode */
894 && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
896 /* Start a shell on console */
897 new_init_action(RESPAWN, bb_default_login_shell, "");
899 /* Not in single user mode -- see what inittab says */
901 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
902 * then parse_inittab() simply adds in some default
903 * actions(i.e., runs INIT_SCRIPT and then starts a pair
904 * of "askfirst" shells */
909 if (getenv("SELINUX_INIT") == NULL) {
912 putenv((char*)"SELINUX_INIT=YES");
913 if (selinux_init_load_policy(&enforce) == 0) {
914 BB_EXECVP(argv[0], argv);
915 } else if (enforce > 0) {
916 /* SELinux in enforcing mode but load_policy failed */
917 message(L_CONSOLE, "Cannot load SELinux Policy. "
918 "Machine is in enforcing mode. Halting now.");
922 #endif /* CONFIG_SELINUX */
924 /* Make the command line just say "init" - thats all, nothing else */
925 strncpy(argv[0], "init", strlen(argv[0]));
926 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
928 memset(*argv, 0, strlen(*argv));
930 /* Now run everything that needs to be run */
932 /* First run the sysinit command */
933 run_actions(SYSINIT);
935 /* Next run anything that wants to block */
938 /* Next run anything to be run only once */
941 /* Redefine SIGHUP to reread /etc/inittab */
942 if (ENABLE_FEATURE_USE_INITTAB)
943 signal(SIGHUP, reload_signal);
945 signal(SIGHUP, SIG_IGN);
947 /* Now run the looping stuff for the rest of forever */
949 /* run the respawn stuff */
950 run_actions(RESPAWN);
952 /* run the askfirst stuff */
953 run_actions(ASKFIRST);
955 /* Don't consume all CPU time -- sleep a bit */
958 /* Wait for any child process to exit */
961 /* Find out who died and clean up their corpse */
962 for (a = init_action_list; a; a = a->next) {
963 if (a->pid == wpid) {
964 /* Set the pid to 0 so that the process gets
965 * restarted by run_actions() */
967 message(L_LOG, "process '%s' (pid %d) exited. "
968 "Scheduling for restart.",
972 /* see if anyone else is waiting to be reaped */
973 wpid = wait_any_nohang(NULL);