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 /* like respawn, but wait for <Enter> to be pressed on tty: */
42 #define CTRLALTDEL 0x20
46 #define STR_SYSINIT "\x01"
47 #define STR_RESPAWN "\x02"
48 #define STR_ASKFIRST "\x04"
49 #define STR_WAIT "\x08"
50 #define STR_ONCE "\x10"
51 #define STR_CTRLALTDEL "\x20"
52 #define STR_SHUTDOWN "\x40"
53 #define STR_RESTART "\x80"
55 /* Set up a linked list of init_actions, to be read from inittab */
57 struct init_action *next;
60 char terminal[CONSOLE_NAME_SIZE];
61 char command[COMMAND_SIZE];
64 /* Static variables */
65 static struct init_action *init_action_list = NULL;
67 static const char *log_console = VC_5;
68 static sig_atomic_t got_cont = 0;
74 #if ENABLE_FEATURE_EXTRA_QUIET
77 MAYBE_CONSOLE = L_CONSOLE,
80 #ifndef RB_HALT_SYSTEM
81 RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
82 RB_ENABLE_CAD = 0x89abcdef,
84 RB_POWER_OFF = 0x4321fedc,
85 RB_AUTOBOOT = 0x01234567,
89 static const char *const environment[] = {
97 /* Function prototypes */
98 static void delete_init_action(struct init_action *a);
99 static void halt_reboot_pwoff(int sig) NORETURN;
101 static void waitfor(pid_t pid)
103 /* waitfor(run(x)): protect against failed fork inside run() */
107 /* Wait for any child (prevent zombies from exiting orphaned processes)
108 * but exit the loop only when specified one has exited. */
109 while (wait(NULL) != pid)
113 static void loop_forever(void) NORETURN;
114 static void loop_forever(void)
120 /* Print a message to the specified device.
121 * "where" may be bitwise-or'd from L_LOG | L_CONSOLE
122 * NB: careful, we can be called after vfork!
124 #define messageD(...) do { if (ENABLE_DEBUG_INIT) message(__VA_ARGS__); } while (0)
125 static void message(int where, const char *fmt, ...)
126 __attribute__ ((format(printf, 2, 3)));
127 static void message(int where, const char *fmt, ...)
129 static int log_fd = -1;
135 va_start(arguments, fmt);
136 vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
138 msg[sizeof(msg) - 2] = '\0';
141 if (ENABLE_FEATURE_INIT_SYSLOG) {
142 /* Log the message to syslogd */
145 openlog(applet_name, 0, LOG_DAEMON);
146 syslog(LOG_INFO, "init: %s", msg + 1);
154 /* Take full control of the log tty, and never close it.
155 * It's mine, all mine! Muhahahaha! */
160 log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
162 bb_error_msg("can't log to %s", log_console);
165 close_on_exec_on(log_fd);
170 full_write(log_fd, msg, l);
172 return; /* don't print dup messages */
176 if (where & L_CONSOLE) {
177 /* Send console messages to console so people will see them. */
178 full_write(STDERR_FILENO, msg, l);
182 /* From <linux/serial.h> */
183 struct serial_struct {
192 unsigned short close_delay;
194 char reserved_char[1];
196 unsigned short closing_wait; /* time to wait before closing */
197 unsigned short closing_wait2; /* no longer used... */
198 unsigned char *iomem_base;
199 unsigned short iomem_reg_shift;
200 unsigned int port_high;
201 unsigned long iomap_base; /* cookie passed into ioremap */
203 /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
204 uint32_t bbox_reserved[16];
206 static void console_init(void)
208 struct serial_struct sr;
211 s = getenv("CONSOLE");
212 if (!s) s = getenv("console");
214 int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
220 messageD(L_LOG, "console='%s'", s);
222 /* Make sure fd 0,1,2 are not closed
223 * (so that they won't be used by future opens) */
228 if (ioctl(STDIN_FILENO, TIOCGSERIAL, &sr) == 0) {
229 /* Force the TERM setting to vt102 for serial console
230 * if TERM is set to linux (the default) */
231 if (!s || strcmp(s, "linux") == 0)
232 putenv((char*)"TERM=vt102");
233 if (!ENABLE_FEATURE_INIT_SYSLOG)
236 putenv((char*)"TERM=linux");
239 /* Set terminal settings to reasonable defaults.
240 * NB: careful, we can be called after vfork! */
241 static void set_sane_term(void)
245 tcgetattr(STDIN_FILENO, &tty);
247 /* set control chars */
248 tty.c_cc[VINTR] = 3; /* C-c */
249 tty.c_cc[VQUIT] = 28; /* C-\ */
250 tty.c_cc[VERASE] = 127; /* C-? */
251 tty.c_cc[VKILL] = 21; /* C-u */
252 tty.c_cc[VEOF] = 4; /* C-d */
253 tty.c_cc[VSTART] = 17; /* C-q */
254 tty.c_cc[VSTOP] = 19; /* C-s */
255 tty.c_cc[VSUSP] = 26; /* C-z */
257 /* use line dicipline 0 */
260 /* Make it be sane */
261 tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
262 tty.c_cflag |= CREAD | HUPCL | CLOCAL;
265 tty.c_iflag = ICRNL | IXON | IXOFF;
268 tty.c_oflag = OPOST | ONLCR;
272 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
274 tcsetattr(STDIN_FILENO, TCSANOW, &tty);
277 /* Open the new terminal device.
278 * NB: careful, we can be called after vfork! */
279 static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
281 /* empty tty_name means "use init's tty", else... */
285 /* fd can be only < 0 or 0: */
286 fd = device_open(tty_name, O_RDWR);
288 message(L_LOG | L_CONSOLE, "Can't open %s: %s",
289 tty_name, strerror(errno));
292 if (ENABLE_DEBUG_INIT)
294 /* NB: we don't reach this if we were called after vfork.
295 * Thus halt_reboot_pwoff() itself need not be vfork-safe. */
296 halt_reboot_pwoff(SIGUSR1); /* halt the system */
304 /* Wrapper around exec:
305 * Takes string (max COMMAND_SIZE chars).
306 * If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'.
307 * Otherwise splits words on whitespace, deals with leading dash,
308 * and uses plain exec().
309 * NB: careful, we can be called after vfork!
311 static void init_exec(const char *command)
313 char *cmd[COMMAND_SIZE / 2];
314 char buf[COMMAND_SIZE + 6]; /* COMMAND_SIZE+strlen("exec ")+1 */
315 int dash = (command[0] == '-' /* maybe? && command[1] == '/' */);
317 /* See if any special /bin/sh requiring characters are present */
318 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
319 strcpy(buf, "exec ");
320 strcpy(buf + 5, command + dash); /* excluding "-" */
321 /* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */
322 cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash);
323 cmd[1] = (char*)"-c";
327 /* Convert command (char*) into cmd (char**, one word per string) */
330 next = strcpy(buf, command); /* including "-" */
331 while ((word = strsep(&next, " \t")) != NULL) {
332 if (*word != '\0') { /* not two spaces/tabs together? */
339 /* If we saw leading "-", it is interactive shell.
340 * Try harder to give it a controlling tty.
341 * And skip "-" in actual exec call. */
343 /* _Attempt_ to make stdin a controlling tty. */
344 if (ENABLE_FEATURE_INIT_SCTTY)
345 ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/);
347 BB_EXECVP(cmd[0] + dash, cmd);
348 message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
349 cmd[0], strerror(errno));
350 /* returns if execvp fails */
353 /* Used only by run_actions */
354 static pid_t run(const struct init_action *a)
357 sigset_t nmask, omask;
359 /* Block sigchild while forking (why?) */
361 sigaddset(&nmask, SIGCHLD);
362 sigprocmask(SIG_BLOCK, &nmask, &omask);
363 if (BB_MMU && (a->action_type & ASKFIRST))
367 sigprocmask(SIG_SETMASK, &omask, NULL);
370 message(L_LOG | L_CONSOLE, "Can't fork");
376 /* Reset signal handlers that were set by the parent process */
389 /* Create a new session and make ourself the process
393 /* Open the new terminal device */
394 open_stdio_to_tty(a->terminal, 1 /* - exit if open fails */);
396 // NB: do not enable unless you change vfork to fork above
397 #ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
398 /* If the init Action requires us to wait, then force the
399 * supplied terminal to be the controlling tty. */
400 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
401 /* Now fork off another process to just hang around */
404 message(L_LOG | L_CONSOLE, "Can't fork");
409 /* Parent - wait till the child is done */
415 signal(SIGCHLD, SIG_DFL);
418 /* See if stealing the controlling tty back is necessary */
419 if (tcgetpgrp(0) != getpid())
422 /* Use a temporary process to steal the controlling tty. */
425 message(L_LOG | L_CONSOLE, "Can't fork");
430 ioctl(0, TIOCSCTTY, 1);
437 /* Child - fall though to actually execute things */
441 /* NB: on NOMMU we can't wait for input in child, so
442 * "askfirst" will work the same as "respawn". */
443 if (BB_MMU && (a->action_type & ASKFIRST)) {
444 static const char press_enter[] ALIGN1 =
445 #ifdef CUSTOMIZED_BANNER
446 #include CUSTOMIZED_BANNER
448 "\nPlease press Enter to activate this console. ";
451 * Save memory by not exec-ing anything large (like a shell)
452 * before the user wants it. This is critical if swap is not
453 * enabled and the system has low memory. Generally this will
454 * be run on the second virtual console, and the first will
455 * be allowed to start a shell or whatever an init script
458 messageD(L_LOG, "waiting for enter to start '%s'"
459 "(pid %d, tty '%s')\n",
460 a->command, getpid(), a->terminal);
461 full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1);
462 while (safe_read(STDIN_FILENO, &c, 1) == 1 && c != '\n')
466 if (ENABLE_FEATURE_INIT_COREDUMPS) {
468 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
470 limit.rlim_cur = RLIM_INFINITY;
471 limit.rlim_max = RLIM_INFINITY;
472 setrlimit(RLIMIT_CORE, &limit);
476 /* Log the process name and args */
477 message(L_LOG, "starting pid %d, tty '%s': '%s'",
478 getpid(), a->terminal, a->command);
480 /* Now run it. The new program will take over this PID,
481 * so nothing further in init.c should be run. */
482 init_exec(a->command);
483 /* We're still here? Some error happened. */
487 /* Run all commands of a particular type */
488 static void run_actions(int action_type)
490 struct init_action *a, *tmp;
492 for (a = init_action_list; a; a = tmp) {
494 if (a->action_type & action_type) {
495 // Pointless: run() will error out if open of device fails.
496 ///* a->terminal of "" means "init's console" */
497 //if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
498 // //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
499 // delete_init_action(a);
501 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
503 delete_init_action(a);
504 } else if (a->action_type & ONCE) {
506 delete_init_action(a);
507 } else if (a->action_type & (RESPAWN | ASKFIRST)) {
508 /* Only run stuff with pid==0. If they have
509 * a pid, that means it is still running */
518 static void init_reboot(unsigned long magic)
521 /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
522 * linux/kernel/sys.c, which can cause the machine to panic when
523 * the init process is killed.... */
525 if (pid == 0) { /* child */
532 static void kill_all_processes(void)
534 /* run everything to be run at "shutdown". This is done _prior_
535 * to killing everything, in case people wish to use scripts to
536 * shut things down gracefully... */
537 run_actions(SHUTDOWN);
539 /* first disable all our signals */
540 sigprocmask_allsigs(SIG_BLOCK);
542 message(L_CONSOLE | L_LOG, "The system is going down NOW!");
544 /* Allow Ctrl-Alt-Del to reboot system. */
545 init_reboot(RB_ENABLE_CAD);
547 /* Send signals to every process _except_ pid 1 */
548 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
553 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
559 static void halt_reboot_pwoff(int sig)
564 kill_all_processes();
568 if (sig == SIGTERM) {
571 } else if (sig == SIGUSR2) {
575 message(L_CONSOLE | L_LOG, "Requesting system %s", m);
576 /* allow time for last message to reach serial console */
582 /* Handler for QUIT - exec "restart" action,
583 * else (no such action defined) do nothing */
584 static void exec_restart_action(int sig UNUSED_PARAM)
586 struct init_action *a;
588 for (a = init_action_list; a; a = a->next) {
589 if (a->action_type & RESTART) {
590 kill_all_processes();
592 /* unblock all signals (blocked in kill_all_processes()) */
593 sigprocmask_allsigs(SIG_UNBLOCK);
595 /* Open the new terminal device */
596 open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
598 messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
599 init_exec(a->command);
601 init_reboot(RB_HALT_SYSTEM);
607 static void ctrlaltdel_signal(int sig UNUSED_PARAM)
609 run_actions(CTRLALTDEL);
612 /* The SIGSTOP & SIGTSTP handler */
613 static void stop_handler(int sig UNUSED_PARAM)
615 int saved_errno = errno;
624 /* The SIGCONT handler */
625 static void cont_handler(int sig UNUSED_PARAM)
630 static void new_init_action(uint8_t action_type, const char *command, const char *cons)
632 struct init_action *a, *last;
635 // if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
638 /* Append to the end of the list */
639 for (a = last = init_action_list; a; a = a->next) {
640 /* don't enter action if it's already in the list,
641 * but do overwrite existing actions */
642 if ((strcmp(a->command, command) == 0)
643 && (strcmp(a->terminal, cons) == 0)
645 a->action_type = action_type;
651 a = xzalloc(sizeof(*a));
655 init_action_list = a;
657 a->action_type = action_type;
658 safe_strncpy(a->command, command, sizeof(a->command));
659 safe_strncpy(a->terminal, cons, sizeof(a->terminal));
660 messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
661 a->command, a->action_type, a->terminal);
664 static void delete_init_action(struct init_action *action)
666 struct init_action *a, *b = NULL;
668 for (a = init_action_list; a; b = a, a = a->next) {
671 init_action_list = a->next;
681 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
682 * then parse_inittab() simply adds in some default
683 * actions(i.e., runs INIT_SCRIPT and then starts a pair
684 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
685 * _is_ defined, but /etc/inittab is missing, this
686 * results in the same set of default behaviors.
688 static void parse_inittab(void)
691 char buf[COMMAND_SIZE];
693 if (ENABLE_FEATURE_USE_INITTAB)
694 file = fopen(INITTAB, "r");
698 /* No inittab file -- set up some default behavior */
700 /* Reboot on Ctrl-Alt-Del */
701 new_init_action(CTRLALTDEL, "reboot", "");
702 /* Umount all filesystems on halt/reboot */
703 new_init_action(SHUTDOWN, "umount -a -r", "");
704 /* Swapoff on halt/reboot */
705 if (ENABLE_SWAPONOFF)
706 new_init_action(SHUTDOWN, "swapoff -a", "");
707 /* Prepare to restart init when a QUIT is received */
708 new_init_action(RESTART, "init", "");
709 /* Askfirst shell on tty1-4 */
710 new_init_action(ASKFIRST, bb_default_login_shell, "");
711 new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
712 new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
713 new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
715 new_init_action(SYSINIT, INIT_SCRIPT, "");
720 while (fgets(buf, COMMAND_SIZE, file) != NULL) {
721 static const char actions[] =
722 STR_SYSINIT "sysinit\0"
723 STR_RESPAWN "respawn\0"
724 STR_ASKFIRST "askfirst\0"
727 STR_CTRLALTDEL "ctrlaltdel\0"
728 STR_SHUTDOWN "shutdown\0"
729 STR_RESTART "restart\0"
731 char tmpConsole[CONSOLE_NAME_SIZE];
732 char *id, *runlev, *action, *command;
735 /* Skip leading spaces */
736 id = skip_whitespace(buf);
737 /* Trim the trailing '\n' */
738 *strchrnul(id, '\n') = '\0';
739 /* Skip the line if it is a comment */
740 if (*id == '#' || *id == '\0')
743 /* Line is: "id:runlevel_ignored:action:command" */
744 runlev = strchr(id, ':');
745 if (runlev == NULL /*|| runlev[1] == '\0' - not needed */)
747 action = strchr(runlev + 1, ':');
748 if (action == NULL /*|| action[1] == '\0' - not needed */)
750 command = strchr(action + 1, ':');
751 if (command == NULL || command[1] == '\0')
754 *command = '\0'; /* action => ":action\0" now */
755 for (a = actions; a[0]; a += strlen(a) + 1) {
756 if (strcmp(a + 1, action + 1) == 0) {
759 if (strncmp(id, "/dev/", 5) == 0)
761 strcpy(tmpConsole, "/dev/");
762 safe_strncpy(tmpConsole + 5, id,
763 sizeof(tmpConsole) - 5);
766 new_init_action((uint8_t)a[0], command + 1, id);
771 /* Choke on an unknown action */
773 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", id);
779 #if ENABLE_FEATURE_USE_INITTAB
780 static void reload_signal(int sig UNUSED_PARAM)
782 struct init_action *a, *tmp;
784 message(L_LOG, "reloading /etc/inittab");
786 /* disable old entrys */
787 for (a = init_action_list; a; a = a->next) {
788 a->action_type = ONCE;
793 if (ENABLE_FEATURE_KILL_REMOVED) {
794 /* Be nice and send SIGTERM first */
795 for (a = init_action_list; a; a = a->next) {
797 if ((a->action_type & ONCE) && pid != 0) {
801 #if CONFIG_FEATURE_KILL_DELAY
802 /* NB: parent will wait in NOMMU case */
803 if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
804 sleep(CONFIG_FEATURE_KILL_DELAY);
805 for (a = init_action_list; a; a = a->next) {
807 if ((a->action_type & ONCE) && pid != 0) {
816 /* remove unused entrys */
817 for (a = init_action_list; a; a = tmp) {
819 if ((a->action_type & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
820 delete_init_action(a);
823 run_actions(RESPAWN | ASKFIRST);
827 int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
828 int init_main(int argc UNUSED_PARAM, char **argv)
830 struct init_action *a;
833 die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
835 if (argv[1] && !strcmp(argv[1], "-q")) {
836 return kill(1, SIGHUP);
839 if (!ENABLE_DEBUG_INIT) {
840 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
842 && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
846 /* Set up sig handlers -- be sure to
847 * clear all of these in run() */
848 signal(SIGQUIT, exec_restart_action);
850 + (1 << SIGUSR1) /* halt */
851 + (1 << SIGUSR2) /* poweroff */
852 + (1 << SIGTERM) /* reboot */
853 , halt_reboot_pwoff);
854 signal(SIGINT, ctrlaltdel_signal);
855 signal(SIGCONT, cont_handler);
861 /* Turn off rebooting via CTL-ALT-DEL -- we get a
862 * SIGINT on CAD so we can shut things down gracefully... */
863 init_reboot(RB_DISABLE_CAD);
866 /* Figure out where the default console should be */
872 const char *const *e;
873 /* Make sure environs is set to something sane */
874 for (e = environment; *e; e++)
878 if (argv[1]) setenv("RUNLEVEL", argv[1], 1);
881 message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
883 /* Make sure there is enough memory to do something useful. */
884 if (ENABLE_SWAPONOFF) {
887 if (!sysinfo(&info) &&
888 (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
890 message(L_CONSOLE, "Low memory, forcing swapon");
891 /* swapon -a requires /proc typically */
892 new_init_action(SYSINIT, "mount -t proc proc /proc", "");
893 /* Try to turn on swap */
894 new_init_action(SYSINIT, "swapon -a", "");
895 run_actions(SYSINIT); /* wait and removing */
899 /* Check if we are supposed to be in single user mode */
901 && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
903 /* Start a shell on console */
904 new_init_action(RESPAWN, bb_default_login_shell, "");
906 /* Not in single user mode -- see what inittab says */
908 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
909 * then parse_inittab() simply adds in some default
910 * actions(i.e., runs INIT_SCRIPT and then starts a pair
911 * of "askfirst" shells */
916 if (getenv("SELINUX_INIT") == NULL) {
919 putenv((char*)"SELINUX_INIT=YES");
920 if (selinux_init_load_policy(&enforce) == 0) {
921 BB_EXECVP(argv[0], argv);
922 } else if (enforce > 0) {
923 /* SELinux in enforcing mode but load_policy failed */
924 message(L_CONSOLE, "Cannot load SELinux Policy. "
925 "Machine is in enforcing mode. Halting now.");
929 #endif /* CONFIG_SELINUX */
931 /* Make the command line just say "init" - thats all, nothing else */
932 strncpy(argv[0], "init", strlen(argv[0]));
933 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
935 memset(*argv, 0, strlen(*argv));
937 /* Now run everything that needs to be run */
939 /* First run the sysinit command */
940 run_actions(SYSINIT);
942 /* Next run anything that wants to block */
945 /* Next run anything to be run only once */
948 /* Redefine SIGHUP to reread /etc/inittab */
949 #if ENABLE_FEATURE_USE_INITTAB
950 signal(SIGHUP, reload_signal);
952 signal(SIGHUP, SIG_IGN);
955 /* Now run the looping stuff for the rest of forever */
957 /* run the respawn/askfirst stuff */
958 run_actions(RESPAWN | ASKFIRST);
960 /* Don't consume all CPU time -- sleep a bit */
963 /* Wait for any child process to exit */
966 /* Find out who died and clean up their corpse */
967 for (a = init_action_list; a; a = a->next) {
968 if (a->pid == wpid) {
969 /* Set the pid to 0 so that the process gets
970 * restarted by run_actions() */
972 message(L_LOG, "process '%s' (pid %d) exited. "
973 "Scheduling for restart.",
977 /* see if anyone else is waiting to be reaped */
978 wpid = wait_any_nohang(NULL);