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) */
225 /* bb_sanitize_stdio(); - WRONG.
226 * It fails if "/dev/null" doesnt exist, and for init
227 * this is a real possibility! Open code it instead. */
229 int fd = open(bb_dev_null, O_RDWR);
231 /* Give me _ANY_ open descriptor! */
232 fd = xopen("/", O_RDONLY); /* we don't believe this can fail */
234 while ((unsigned)fd < 2)
241 if (ioctl(STDIN_FILENO, TIOCGSERIAL, &sr) == 0) {
242 /* Force the TERM setting to vt102 for serial console
243 * if TERM is set to linux (the default) */
244 if (!s || strcmp(s, "linux") == 0)
245 putenv((char*)"TERM=vt102");
246 if (!ENABLE_FEATURE_INIT_SYSLOG)
249 putenv((char*)"TERM=linux");
252 /* Set terminal settings to reasonable defaults.
253 * NB: careful, we can be called after vfork! */
254 static void set_sane_term(void)
258 tcgetattr(STDIN_FILENO, &tty);
260 /* set control chars */
261 tty.c_cc[VINTR] = 3; /* C-c */
262 tty.c_cc[VQUIT] = 28; /* C-\ */
263 tty.c_cc[VERASE] = 127; /* C-? */
264 tty.c_cc[VKILL] = 21; /* C-u */
265 tty.c_cc[VEOF] = 4; /* C-d */
266 tty.c_cc[VSTART] = 17; /* C-q */
267 tty.c_cc[VSTOP] = 19; /* C-s */
268 tty.c_cc[VSUSP] = 26; /* C-z */
270 /* use line dicipline 0 */
273 /* Make it be sane */
274 tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
275 tty.c_cflag |= CREAD | HUPCL | CLOCAL;
278 tty.c_iflag = ICRNL | IXON | IXOFF;
281 tty.c_oflag = OPOST | ONLCR;
285 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
287 tcsetattr(STDIN_FILENO, TCSANOW, &tty);
290 /* Open the new terminal device.
291 * NB: careful, we can be called after vfork! */
292 static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
294 /* empty tty_name means "use init's tty", else... */
298 /* fd can be only < 0 or 0: */
299 fd = device_open(tty_name, O_RDWR);
301 message(L_LOG | L_CONSOLE, "Can't open %s: %s",
302 tty_name, strerror(errno));
305 if (ENABLE_DEBUG_INIT)
307 /* NB: we don't reach this if we were called after vfork.
308 * Thus halt_reboot_pwoff() itself need not be vfork-safe. */
309 halt_reboot_pwoff(SIGUSR1); /* halt the system */
317 /* Wrapper around exec:
318 * Takes string (max COMMAND_SIZE chars).
319 * If chars like '>' detected, execs '[-]/bin/sh -c "exec ......."'.
320 * Otherwise splits words on whitespace, deals with leading dash,
321 * and uses plain exec().
322 * NB: careful, we can be called after vfork!
324 static void init_exec(const char *command)
326 char *cmd[COMMAND_SIZE / 2];
327 char buf[COMMAND_SIZE + 6]; /* COMMAND_SIZE+strlen("exec ")+1 */
328 int dash = (command[0] == '-' /* maybe? && command[1] == '/' */);
330 /* See if any special /bin/sh requiring characters are present */
331 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
332 strcpy(buf, "exec ");
333 strcpy(buf + 5, command + dash); /* excluding "-" */
334 /* NB: LIBBB_DEFAULT_LOGIN_SHELL define has leading dash */
335 cmd[0] = (char*)(LIBBB_DEFAULT_LOGIN_SHELL + !dash);
336 cmd[1] = (char*)"-c";
340 /* Convert command (char*) into cmd (char**, one word per string) */
343 next = strcpy(buf, command); /* including "-" */
344 while ((word = strsep(&next, " \t")) != NULL) {
345 if (*word != '\0') { /* not two spaces/tabs together? */
352 /* If we saw leading "-", it is interactive shell.
353 * Try harder to give it a controlling tty.
354 * And skip "-" in actual exec call. */
356 /* _Attempt_ to make stdin a controlling tty. */
357 if (ENABLE_FEATURE_INIT_SCTTY)
358 ioctl(STDIN_FILENO, TIOCSCTTY, 0 /*only try, don't steal*/);
360 BB_EXECVP(cmd[0] + dash, cmd);
361 message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
362 cmd[0], strerror(errno));
363 /* returns if execvp fails */
366 /* Used only by run_actions */
367 static pid_t run(const struct init_action *a)
370 sigset_t nmask, omask;
372 /* Block sigchild while forking (why?) */
374 sigaddset(&nmask, SIGCHLD);
375 sigprocmask(SIG_BLOCK, &nmask, &omask);
376 if (BB_MMU && (a->action_type & ASKFIRST))
380 sigprocmask(SIG_SETMASK, &omask, NULL);
383 message(L_LOG | L_CONSOLE, "Can't fork");
389 /* Reset signal handlers that were set by the parent process */
402 /* Create a new session and make ourself the process
406 /* Open the new terminal device */
407 open_stdio_to_tty(a->terminal, 1 /* - exit if open fails */);
409 // NB: do not enable unless you change vfork to fork above
410 #ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
411 /* If the init Action requires us to wait, then force the
412 * supplied terminal to be the controlling tty. */
413 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
414 /* Now fork off another process to just hang around */
417 message(L_LOG | L_CONSOLE, "Can't fork");
422 /* Parent - wait till the child is done */
428 signal(SIGCHLD, SIG_DFL);
431 /* See if stealing the controlling tty back is necessary */
432 if (tcgetpgrp(0) != getpid())
435 /* Use a temporary process to steal the controlling tty. */
438 message(L_LOG | L_CONSOLE, "Can't fork");
443 ioctl(0, TIOCSCTTY, 1);
450 /* Child - fall though to actually execute things */
454 /* NB: on NOMMU we can't wait for input in child, so
455 * "askfirst" will work the same as "respawn". */
456 if (BB_MMU && (a->action_type & ASKFIRST)) {
457 static const char press_enter[] ALIGN1 =
458 #ifdef CUSTOMIZED_BANNER
459 #include CUSTOMIZED_BANNER
461 "\nPlease press Enter to activate this console. ";
464 * Save memory by not exec-ing anything large (like a shell)
465 * before the user wants it. This is critical if swap is not
466 * enabled and the system has low memory. Generally this will
467 * be run on the second virtual console, and the first will
468 * be allowed to start a shell or whatever an init script
471 messageD(L_LOG, "waiting for enter to start '%s'"
472 "(pid %d, tty '%s')\n",
473 a->command, getpid(), a->terminal);
474 full_write(STDOUT_FILENO, press_enter, sizeof(press_enter) - 1);
475 while (safe_read(STDIN_FILENO, &c, 1) == 1 && c != '\n')
479 if (ENABLE_FEATURE_INIT_COREDUMPS) {
481 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
483 limit.rlim_cur = RLIM_INFINITY;
484 limit.rlim_max = RLIM_INFINITY;
485 setrlimit(RLIMIT_CORE, &limit);
489 /* Log the process name and args */
490 message(L_LOG, "starting pid %d, tty '%s': '%s'",
491 getpid(), a->terminal, a->command);
493 /* Now run it. The new program will take over this PID,
494 * so nothing further in init.c should be run. */
495 init_exec(a->command);
496 /* We're still here? Some error happened. */
500 /* Run all commands of a particular type */
501 static void run_actions(int action_type)
503 struct init_action *a, *tmp;
505 for (a = init_action_list; a; a = tmp) {
507 if (a->action_type & action_type) {
508 // Pointless: run() will error out if open of device fails.
509 ///* a->terminal of "" means "init's console" */
510 //if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
511 // //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
512 // delete_init_action(a);
514 if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
516 delete_init_action(a);
517 } else if (a->action_type & ONCE) {
519 delete_init_action(a);
520 } else if (a->action_type & (RESPAWN | ASKFIRST)) {
521 /* Only run stuff with pid==0. If they have
522 * a pid, that means it is still running */
531 static void init_reboot(unsigned long magic)
534 /* We have to fork here, since the kernel calls do_exit(EXIT_SUCCESS) in
535 * linux/kernel/sys.c, which can cause the machine to panic when
536 * the init process is killed.... */
538 if (pid == 0) { /* child */
545 static void kill_all_processes(void)
547 /* run everything to be run at "shutdown". This is done _prior_
548 * to killing everything, in case people wish to use scripts to
549 * shut things down gracefully... */
550 run_actions(SHUTDOWN);
552 /* first disable all our signals */
553 sigprocmask_allsigs(SIG_BLOCK);
555 message(L_CONSOLE | L_LOG, "The system is going down NOW!");
557 /* Allow Ctrl-Alt-Del to reboot system. */
558 init_reboot(RB_ENABLE_CAD);
560 /* Send signals to every process _except_ pid 1 */
561 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
566 message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
572 static void halt_reboot_pwoff(int sig)
577 kill_all_processes();
581 if (sig == SIGTERM) {
584 } else if (sig == SIGUSR2) {
588 message(L_CONSOLE | L_LOG, "Requesting system %s", m);
589 /* allow time for last message to reach serial console */
595 /* Handler for QUIT - exec "restart" action,
596 * else (no such action defined) do nothing */
597 static void exec_restart_action(int sig UNUSED_PARAM)
599 struct init_action *a;
601 for (a = init_action_list; a; a = a->next) {
602 if (a->action_type & RESTART) {
603 kill_all_processes();
605 /* unblock all signals (blocked in kill_all_processes()) */
606 sigprocmask_allsigs(SIG_UNBLOCK);
608 /* Open the new terminal device */
609 open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
611 messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
612 init_exec(a->command);
614 init_reboot(RB_HALT_SYSTEM);
620 static void ctrlaltdel_signal(int sig UNUSED_PARAM)
622 run_actions(CTRLALTDEL);
625 /* The SIGSTOP & SIGTSTP handler */
626 static void stop_handler(int sig UNUSED_PARAM)
628 int saved_errno = errno;
637 /* The SIGCONT handler */
638 static void cont_handler(int sig UNUSED_PARAM)
643 static void new_init_action(uint8_t action_type, const char *command, const char *cons)
645 struct init_action *a, *last;
648 // if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
651 /* Append to the end of the list */
652 for (a = last = init_action_list; a; a = a->next) {
653 /* don't enter action if it's already in the list,
654 * but do overwrite existing actions */
655 if ((strcmp(a->command, command) == 0)
656 && (strcmp(a->terminal, cons) == 0)
658 a->action_type = action_type;
664 a = xzalloc(sizeof(*a));
668 init_action_list = a;
670 a->action_type = action_type;
671 safe_strncpy(a->command, command, sizeof(a->command));
672 safe_strncpy(a->terminal, cons, sizeof(a->terminal));
673 messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%s'\n",
674 a->command, a->action_type, a->terminal);
677 static void delete_init_action(struct init_action *action)
679 struct init_action *a, *b = NULL;
681 for (a = init_action_list; a; b = a, a = a->next) {
684 init_action_list = a->next;
694 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
695 * then parse_inittab() simply adds in some default
696 * actions(i.e., runs INIT_SCRIPT and then starts a pair
697 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
698 * _is_ defined, but /etc/inittab is missing, this
699 * results in the same set of default behaviors.
701 static void parse_inittab(void)
704 char buf[COMMAND_SIZE];
706 if (ENABLE_FEATURE_USE_INITTAB)
707 file = fopen(INITTAB, "r");
711 /* No inittab file -- set up some default behavior */
713 /* Reboot on Ctrl-Alt-Del */
714 new_init_action(CTRLALTDEL, "reboot", "");
715 /* Umount all filesystems on halt/reboot */
716 new_init_action(SHUTDOWN, "umount -a -r", "");
717 /* Swapoff on halt/reboot */
718 if (ENABLE_SWAPONOFF)
719 new_init_action(SHUTDOWN, "swapoff -a", "");
720 /* Prepare to restart init when a QUIT is received */
721 new_init_action(RESTART, "init", "");
722 /* Askfirst shell on tty1-4 */
723 new_init_action(ASKFIRST, bb_default_login_shell, "");
724 new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
725 new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
726 new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
728 new_init_action(SYSINIT, INIT_SCRIPT, "");
733 while (fgets(buf, COMMAND_SIZE, file) != NULL) {
734 static const char actions[] =
735 STR_SYSINIT "sysinit\0"
736 STR_RESPAWN "respawn\0"
737 STR_ASKFIRST "askfirst\0"
740 STR_CTRLALTDEL "ctrlaltdel\0"
741 STR_SHUTDOWN "shutdown\0"
742 STR_RESTART "restart\0"
744 char tmpConsole[CONSOLE_NAME_SIZE];
745 char *id, *runlev, *action, *command;
748 /* Skip leading spaces */
749 id = skip_whitespace(buf);
750 /* Trim the trailing '\n' */
751 *strchrnul(id, '\n') = '\0';
752 /* Skip the line if it is a comment */
753 if (*id == '#' || *id == '\0')
756 /* Line is: "id:runlevel_ignored:action:command" */
757 runlev = strchr(id, ':');
758 if (runlev == NULL /*|| runlev[1] == '\0' - not needed */)
760 action = strchr(runlev + 1, ':');
761 if (action == NULL /*|| action[1] == '\0' - not needed */)
763 command = strchr(action + 1, ':');
764 if (command == NULL || command[1] == '\0')
767 *command = '\0'; /* action => ":action\0" now */
768 for (a = actions; a[0]; a += strlen(a) + 1) {
769 if (strcmp(a + 1, action + 1) == 0) {
772 if (strncmp(id, "/dev/", 5) == 0)
774 strcpy(tmpConsole, "/dev/");
775 safe_strncpy(tmpConsole + 5, id,
776 sizeof(tmpConsole) - 5);
779 new_init_action((uint8_t)a[0], command + 1, id);
784 /* Choke on an unknown action */
786 message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", id);
792 #if ENABLE_FEATURE_USE_INITTAB
793 static void reload_signal(int sig UNUSED_PARAM)
795 struct init_action *a, *tmp;
797 message(L_LOG, "reloading /etc/inittab");
799 /* disable old entrys */
800 for (a = init_action_list; a; a = a->next) {
801 a->action_type = ONCE;
806 if (ENABLE_FEATURE_KILL_REMOVED) {
807 /* Be nice and send SIGTERM first */
808 for (a = init_action_list; a; a = a->next) {
810 if ((a->action_type & ONCE) && pid != 0) {
814 #if CONFIG_FEATURE_KILL_DELAY
815 /* NB: parent will wait in NOMMU case */
816 if ((BB_MMU ? fork() : vfork()) == 0) { /* child */
817 sleep(CONFIG_FEATURE_KILL_DELAY);
818 for (a = init_action_list; a; a = a->next) {
820 if ((a->action_type & ONCE) && pid != 0) {
829 /* remove unused entrys */
830 for (a = init_action_list; a; a = tmp) {
832 if ((a->action_type & (ONCE | SYSINIT | WAIT)) && a->pid == 0) {
833 delete_init_action(a);
836 run_actions(RESPAWN | ASKFIRST);
840 int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
841 int init_main(int argc UNUSED_PARAM, char **argv)
843 struct init_action *a;
846 die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
848 if (argv[1] && !strcmp(argv[1], "-q")) {
849 return kill(1, SIGHUP);
852 if (!ENABLE_DEBUG_INIT) {
853 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
855 && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
859 /* Set up sig handlers -- be sure to
860 * clear all of these in run() */
861 signal(SIGQUIT, exec_restart_action);
863 + (1 << SIGUSR1) /* halt */
864 + (1 << SIGUSR2) /* poweroff */
865 + (1 << SIGTERM) /* reboot */
866 , halt_reboot_pwoff);
867 signal(SIGINT, ctrlaltdel_signal);
868 signal(SIGCONT, cont_handler);
874 /* Turn off rebooting via CTL-ALT-DEL -- we get a
875 * SIGINT on CAD so we can shut things down gracefully... */
876 init_reboot(RB_DISABLE_CAD);
879 /* Figure out where the default console should be */
885 const char *const *e;
886 /* Make sure environs is set to something sane */
887 for (e = environment; *e; e++)
891 if (argv[1]) setenv("RUNLEVEL", argv[1], 1);
894 message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
896 /* Make sure there is enough memory to do something useful. */
897 if (ENABLE_SWAPONOFF) {
900 if (!sysinfo(&info) &&
901 (info.mem_unit ? : 1) * (long long)info.totalram < 1024*1024)
903 message(L_CONSOLE, "Low memory, forcing swapon");
904 /* swapon -a requires /proc typically */
905 new_init_action(SYSINIT, "mount -t proc proc /proc", "");
906 /* Try to turn on swap */
907 new_init_action(SYSINIT, "swapon -a", "");
908 run_actions(SYSINIT); /* wait and removing */
912 /* Check if we are supposed to be in single user mode */
914 && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
916 /* Start a shell on console */
917 new_init_action(RESPAWN, bb_default_login_shell, "");
919 /* Not in single user mode -- see what inittab says */
921 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
922 * then parse_inittab() simply adds in some default
923 * actions(i.e., runs INIT_SCRIPT and then starts a pair
924 * of "askfirst" shells */
929 if (getenv("SELINUX_INIT") == NULL) {
932 putenv((char*)"SELINUX_INIT=YES");
933 if (selinux_init_load_policy(&enforce) == 0) {
934 BB_EXECVP(argv[0], argv);
935 } else if (enforce > 0) {
936 /* SELinux in enforcing mode but load_policy failed */
937 message(L_CONSOLE, "Cannot load SELinux Policy. "
938 "Machine is in enforcing mode. Halting now.");
942 #endif /* CONFIG_SELINUX */
944 /* Make the command line just say "init" - thats all, nothing else */
945 strncpy(argv[0], "init", strlen(argv[0]));
946 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
948 memset(*argv, 0, strlen(*argv));
950 /* Now run everything that needs to be run */
952 /* First run the sysinit command */
953 run_actions(SYSINIT);
955 /* Next run anything that wants to block */
958 /* Next run anything to be run only once */
961 /* Redefine SIGHUP to reread /etc/inittab */
962 #if ENABLE_FEATURE_USE_INITTAB
963 signal(SIGHUP, reload_signal);
965 signal(SIGHUP, SIG_IGN);
968 /* Now run the looping stuff for the rest of forever */
970 /* run the respawn/askfirst stuff */
971 run_actions(RESPAWN | ASKFIRST);
973 /* Don't consume all CPU time -- sleep a bit */
976 /* Wait for any child process to exit */
979 /* Find out who died and clean up their corpse */
980 for (a = init_action_list; a; a = a->next) {
981 if (a->pid == wpid) {
982 /* Set the pid to 0 so that the process gets
983 * restarted by run_actions() */
985 message(L_LOG, "process '%s' (pid %d) exited. "
986 "Scheduling for restart.",
990 /* see if anyone else is waiting to be reaped */
991 wpid = wait_any_nohang(NULL);