1 /* vi: set sw=4 ts=4: */
3 * Mini init implementation for busybox
6 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
7 * Adjusted by so many folks, it's impossible to keep track.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 /* Turn this on to disable all the dangerous
26 rebooting stuff when debugging.
40 #include <sys/fcntl.h>
41 #include <sys/ioctl.h>
42 #include <sys/mount.h>
43 #include <sys/types.h>
47 # include <sys/syslog.h>
51 /* From <linux/vt.h> */
53 unsigned short v_active; /* active vt */
54 unsigned short v_signal; /* signal to send */
55 unsigned short v_state; /* vt bitmask */
57 static const int VT_GETSTATE = 0x5603; /* get global vt state info */
59 /* From <linux/serial.h> */
60 struct serial_struct {
69 unsigned short close_delay;
70 char reserved_char[2];
72 unsigned short closing_wait; /* time to wait before closing */
73 unsigned short closing_wait2; /* no longer used... */
78 #if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__)
79 #include <sys/reboot.h>
80 #define init_reboot(magic) reboot(magic)
82 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
85 #ifndef RB_HALT_SYSTEM
86 static const int RB_HALT_SYSTEM = 0xcdef0123;
87 static const int RB_ENABLE_CAD = 0x89abcdef;
88 static const int RB_DISABLE_CAD = 0;
89 #define RB_POWER_OFF 0x4321fedc
90 static const int RB_AUTOBOOT = 0x01234567;
94 #define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
98 #if defined CONFIG_FEATURE_INIT_COREDUMPS
100 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
101 * before processes are spawned to set core file size as unlimited.
102 * This is for debugging only. Don't use this is production, unless
103 * you want core dumps lying about....
105 #define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
106 #include <sys/resource.h>
107 #include <sys/time.h>
110 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
112 #if __GNU_LIBRARY__ > 5
113 #include <sys/kdaemon.h>
115 extern int bdflush (int func, long int data);
119 #define SHELL "/bin/sh" /* Default shell */
120 #define LOGIN_SHELL "-" SHELL /* Default login shell */
121 #define INITTAB "/etc/inittab" /* inittab file location */
123 #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
126 #define MAXENV 16 /* Number of env. vars */
127 //static const int MAXENV = 16; /* Number of env. vars */
128 static const int LOG = 0x1;
129 static const int CONSOLE = 0x2;
130 #if defined BB_FEATURE_EXTRA_QUIET
131 static const int MAYBE_CONSOLE = 0x0;
133 #define MAYBE_CONSOLE CONSOLE
137 /* Allowed init action types */
148 /* A mapping between "inittab" action name strings and action type codes. */
149 typedef struct initActionType {
151 initActionEnum action;
154 static const struct initActionType actions[] = {
155 {"sysinit", SYSINIT},
156 {"respawn", RESPAWN},
157 {"askfirst", ASKFIRST},
160 {"ctrlaltdel", CTRLALTDEL},
161 {"shutdown", SHUTDOWN},
165 /* Set up a linked list of initActions, to be read from inittab */
166 typedef struct initActionTag initAction;
167 struct initActionTag {
172 initActionEnum action;
174 static initAction *initActionList = NULL;
177 static char *secondConsole = VC_2;
178 static char *thirdConsole = VC_3;
179 static char *fourthConsole = VC_4;
180 static char *log = VC_5;
181 static int kernelVersion = 0;
182 static char termType[32] = "TERM=linux";
183 static char console[32] = _PATH_CONSOLE;
185 static void delete_initAction(initAction * action);
187 static void loop_forever(void)
193 /* Print a message to the specified device.
194 * Device may be bitwise-or'd from LOG | CONSOLE */
196 static inline messageND(int device, char *fmt, ...) { }
198 #define messageND message
200 static void message(int device, char *fmt, ...)
201 __attribute__ ((format (printf, 2, 3)));
202 static void message(int device, char *fmt, ...)
207 #ifdef CONFIG_SYSLOGD
209 /* Log the message to syslogd */
213 va_start(arguments, fmt);
214 vsnprintf(msg, sizeof(msg), fmt, arguments);
216 syslog_msg(LOG_USER, LOG_USER|LOG_INFO, msg);
219 static int log_fd = -1;
221 /* Take full control of the log tty, and never close it.
222 * It's mine, all mine! Muhahahaha! */
225 /* don't even try to log, because there is no such console */
227 /* log to main console instead */
229 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
231 fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
236 if ((device & LOG) && (log_fd >= 0)) {
237 va_start(arguments, fmt);
238 vdprintf(log_fd, fmt, arguments);
243 if (device & CONSOLE) {
244 /* Always send console messages to /dev/console so people will see them. */
247 device_open(_PATH_CONSOLE,
248 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
249 va_start(arguments, fmt);
250 vdprintf(fd, fmt, arguments);
254 fprintf(stderr, "Bummer, can't print: ");
255 va_start(arguments, fmt);
256 vfprintf(stderr, fmt, arguments);
262 /* Set terminal settings to reasonable defaults */
263 static void set_term(int fd)
269 /* set control chars */
270 tty.c_cc[VINTR] = 3; /* C-c */
271 tty.c_cc[VQUIT] = 28; /* C-\ */
272 tty.c_cc[VERASE] = 127; /* C-? */
273 tty.c_cc[VKILL] = 21; /* C-u */
274 tty.c_cc[VEOF] = 4; /* C-d */
275 tty.c_cc[VSTART] = 17; /* C-q */
276 tty.c_cc[VSTOP] = 19; /* C-s */
277 tty.c_cc[VSUSP] = 26; /* C-z */
279 /* use line dicipline 0 */
282 /* Make it be sane */
283 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
284 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
288 tty.c_iflag = ICRNL | IXON | IXOFF;
291 tty.c_oflag = OPOST | ONLCR;
295 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
297 tcsetattr(fd, TCSANOW, &tty);
300 /* How much memory does this machine have?
301 Units are kBytes to avoid overflow on 4GB machines */
302 static int check_free_memory(void)
305 unsigned int result, u, s=10;
307 if (sysinfo(&info) != 0) {
308 perror_msg("Error checking free memory");
312 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
313 * Kernels 2.4.0 return info.mem_unit in bytes. */
316 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
317 result = (info.totalram>>s) + (info.totalswap>>s);
319 if (result < 0) result = INT_MAX;
323 static void console_init(void)
326 int tried_devcons = 0;
327 int tried_vtprimary = 0;
329 struct serial_struct sr;
332 if ((s = getenv("TERM")) != NULL) {
333 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
336 if ((s = getenv("CONSOLE")) != NULL) {
337 safe_strncpy(console, s, sizeof(console));
340 /* sparc kernel supports console=tty[ab] parameter which is also
341 * passed to init, so catch it here */
342 else if ((s = getenv("console")) != NULL) {
343 /* remap tty[ab] to /dev/ttyS[01] */
344 if (strcmp(s, "ttya") == 0)
345 safe_strncpy(console, SC_0, sizeof(console));
346 else if (strcmp(s, "ttyb") == 0)
347 safe_strncpy(console, SC_1, sizeof(console));
351 /* 2.2 kernels: identify the real console backend and try to use it */
352 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
353 /* this is a serial console */
354 snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
355 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
356 /* this is linux virtual tty */
357 snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
359 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
364 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
365 /* Can't open selected console -- try /dev/console */
366 if (!tried_devcons) {
368 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
371 /* Can't open selected console -- try vt1 */
372 if (!tried_vtprimary) {
374 safe_strncpy(console, VC_1, sizeof(console));
380 /* Perhaps we should panic here? */
381 safe_strncpy(console, "/dev/null", sizeof(console));
383 /* check for serial console and disable logging to tty5 & running a
385 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
387 secondConsole = NULL;
389 fourthConsole = NULL;
390 /* Force the TERM setting to vt102 for serial console --
391 * iff TERM is set to linux (the default) */
392 if (strcmp( termType, "TERM=linux" ) == 0)
393 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
394 message(LOG | CONSOLE,
395 "serial console detected. Disabling virtual terminals.\n");
399 message(LOG, "console=%s\n", console);
402 static void fixup_argv(int argc, char **argv, char *new_argv0)
405 /* Fix up argv[0] to be certain we claim to be init */
406 len = strlen(argv[0]);
407 memset(argv[0], 0, len);
408 safe_strncpy(argv[0], new_argv0, len + 1);
410 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
413 memset(argv[len], 0, strlen(argv[len]));
419 static pid_t run(char *command, char *terminal, int get_enter)
425 char *cmd[255], *cmdpath;
428 static const char press_enter[] =
430 #ifdef CUSTOMIZED_BANNER
431 #include CUSTOMIZED_BANNER
434 "\nPlease press Enter to activate this console. ";
435 char *environment[MAXENV+1] = {
438 "PATH=" _PATH_STDPATH,
444 /* inherit environment to the child, merging our values -andy */
445 for (i=0; environ[i]; i++) {
446 for (j=0; environment[j]; j++) {
447 s = strchr(environment[j], '=');
448 if (!strncmp(environ[i], environment[j], s - environment[j]))
451 if (!environment[j]) {
452 environment[j++] = environ[i];
453 environment[j] = NULL;
457 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
458 if ((pid = fork()) == 0)
460 if ((pid = vfork()) == 0)
464 ioctl(0, TIOCNOTTY, 0);
470 /* Reset signal handlers set for parent process */
471 signal(SIGUSR1, SIG_DFL);
472 signal(SIGUSR2, SIG_DFL);
473 signal(SIGINT, SIG_DFL);
474 signal(SIGTERM, SIG_DFL);
475 signal(SIGHUP, SIG_DFL);
477 if ((fd = device_open(terminal, O_RDWR)) < 0) {
478 if (stat(terminal, &sb) != 0) {
479 message(LOG | CONSOLE, "device '%s' does not exist.\n",
483 message(LOG | CONSOLE, "Bummer, can't open %s\n", terminal);
489 ioctl(0, TIOCSCTTY, 1);
490 tcsetpgrp(0, getpgrp());
493 /* See if any special /bin/sh requiring characters are present */
494 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
497 strcpy(buf, "exec ");
498 safe_strncpy(buf + sizeof("exec "), command,
499 sizeof(buf) - sizeof("exec "));
503 /* Convert command (char*) into cmd (char**, one word per string) */
504 safe_strncpy(buf, command, sizeof(buf));
506 for (tmpCmd = buf, i = 0;
507 (tmpCmd = strsep(&s, " \t")) != NULL;) {
508 if (*tmpCmd != '\0') {
520 Interactive shells want to see a dash in argv[0]. This
521 typically is handled by login, argv will be setup this
522 way if a dash appears at the front of the command path
526 if (*cmdpath == '-') {
528 /* skip over the dash */
531 /* find the last component in the command pathname */
532 s = get_last_path_component(cmdpath);
534 /* make a new argv[0] */
535 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
536 message(LOG | CONSOLE, "malloc failed");
544 if (get_enter == TRUE) {
546 * Save memory by not exec-ing anything large (like a shell)
547 * before the user wants it. This is critical if swap is not
548 * enabled and the system has low memory. Generally this will
549 * be run on the second virtual console, and the first will
550 * be allowed to start a shell or whatever an init script
553 messageND(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\n",
554 cmd[0], getpid(), terminal);
555 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
559 /* Log the process name and args */
560 messageND(LOG, "Starting pid %d, console %s: '%s'\n",
561 getpid(), terminal, command);
563 #if defined CONFIG_FEATURE_INIT_COREDUMPS
564 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
566 limit.rlim_cur = RLIM_INFINITY;
567 limit.rlim_max = RLIM_INFINITY;
568 setrlimit(RLIMIT_CORE, &limit);
572 /* Now run it. The new program will take over this PID,
573 * so nothing further in init.c should be run. */
574 execve(cmdpath, cmd, environment);
576 /* We're still here? Some error happened. */
577 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
584 static int waitfor(char *command, char *terminal, int get_enter)
587 int pid = run(command, terminal, get_enter);
590 wpid = wait(&status);
591 if (wpid > 0 && wpid != pid) {
600 /* Make sure there is enough memory to do something useful. *
601 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
602 static void check_memory(void)
606 if (check_free_memory() > 1000)
609 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
610 if (stat("/etc/fstab", &statBuf) == 0) {
611 /* swapon -a requires /proc typically */
612 waitfor("mount proc /proc -t proc", console, FALSE);
613 /* Try to turn on swap */
614 waitfor("swapon -a", console, FALSE);
615 if (check_free_memory() < 1000)
624 "Sorry, your computer does not have enough memory.\n");
628 /* Run all commands to be run right before halt/reboot */
629 static void run_actions(initActionEnum action)
632 for (a = initActionList; a; a = tmp) {
634 if (a->action == action) {
635 waitfor(a->process, a->console, FALSE);
636 delete_initAction(a);
643 static void shutdown_system(void)
645 sigset_t block_signals;
647 /* first disable all our signals */
648 sigemptyset(&block_signals);
649 sigaddset(&block_signals, SIGHUP);
650 sigaddset(&block_signals, SIGCHLD);
651 sigaddset(&block_signals, SIGUSR1);
652 sigaddset(&block_signals, SIGUSR2);
653 sigaddset(&block_signals, SIGINT);
654 sigaddset(&block_signals, SIGTERM);
655 sigprocmask(SIG_BLOCK, &block_signals, NULL);
657 /* Allow Ctrl-Alt-Del to reboot system. */
658 init_reboot(RB_ENABLE_CAD);
660 message(CONSOLE|LOG, "\nThe system is going down NOW !!\n");
663 /* Send signals to every process _except_ pid 1 */
664 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\n");
669 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\n");
673 /* run everything to be run at "shutdown" */
674 run_actions(SHUTDOWN);
677 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
678 /* bdflush, kupdate not needed for kernels >2.2.11 */
684 static void halt_signal(int sig)
689 /* Seems the s390 console is Wierd(tm). */
690 "The system is halted. You may reboot now.\n"
692 /* secondConsole is NULL for a serial console */
693 "The system is halted. Press %s or turn off power\n",
694 (secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
699 /* allow time for last message to reach serial console */
702 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
703 init_reboot(RB_POWER_OFF);
705 init_reboot(RB_HALT_SYSTEM);
710 static void reboot_signal(int sig)
713 message(CONSOLE|LOG, "Please stand by while rebooting the system.\n");
716 /* allow time for last message to reach serial console */
719 init_reboot(RB_AUTOBOOT);
724 static void ctrlaltdel_signal(int sig)
726 run_actions(CTRLALTDEL);
729 #endif /* ! DEBUG_INIT */
731 static void new_initAction(initActionEnum action, char *process, char *cons)
733 initAction *newAction;
739 /* If BusyBox detects that a serial console is in use,
740 * then entries not refering to the console or null devices will _not_ be run.
741 * The exception to this rule is the null device.
743 if (secondConsole == NULL && strcmp(cons, console)
744 && strcmp(cons, "/dev/null"))
746 if (strcmp(cons, "/dev/null") == 0 && action == ASKFIRST)
749 newAction = calloc((size_t) (1), sizeof(initAction));
751 message(LOG | CONSOLE, "Memory allocation failure\n");
754 for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
756 a->nextPtr = newAction;
758 initActionList = newAction;
760 safe_strncpy(newAction->process, process, 255);
761 newAction->action = action;
762 safe_strncpy(newAction->console, cons, 255);
764 // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
765 // newAction->process, newAction->action, newAction->console);
768 static void delete_initAction(initAction * action)
770 initAction *a, *b = NULL;
772 for (a = initActionList; a; b = a, a = a->nextPtr) {
775 initActionList = a->nextPtr;
777 b->nextPtr = a->nextPtr;
785 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
786 * then parse_inittab() simply adds in some default
787 * actions(i.e., runs INIT_SCRIPT and then starts a pair
788 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
789 * _is_ defined, but /etc/inittab is missing, this
790 * results in the same set of default behaviors.
792 static void parse_inittab(void)
794 #ifdef CONFIG_FEATURE_USE_INITTAB
796 char buf[256], lineAsRead[256], tmpConsole[256];
797 char *id, *runlev, *action, *process, *eol;
798 const struct initActionType *a = actions;
802 file = fopen(INITTAB, "r");
804 /* No inittab file -- set up some default behavior */
806 /* Reboot on Ctrl-Alt-Del */
807 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
808 /* Umount all filesystems on halt/reboot */
809 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
810 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
811 /* Swapoff on halt/reboot */
812 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
814 /* Askfirst shell on tty1 */
815 new_initAction(ASKFIRST, LOGIN_SHELL, console);
816 /* Askfirst shell on tty2 */
817 if (secondConsole != NULL)
818 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
819 /* Askfirst shell on tty3 */
820 if (thirdConsole != NULL)
821 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
822 /* Askfirst shell on tty4 */
823 if (fourthConsole != NULL)
824 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
826 new_initAction(SYSINIT, INIT_SCRIPT, console);
829 #ifdef CONFIG_FEATURE_USE_INITTAB
832 while (fgets(buf, 255, file) != NULL) {
834 /* Skip leading spaces */
835 for (id = buf; *id == ' ' || *id == '\t'; id++);
837 /* Skip the line if it's a comment */
838 if (*id == '#' || *id == '\n')
841 /* Trim the trailing \n */
842 eol = strrchr(id, '\n');
846 /* Keep a copy around for posterity's sake (and error msgs) */
847 strcpy(lineAsRead, buf);
849 /* Separate the ID field from the runlevels */
850 runlev = strchr(id, ':');
851 if (runlev == NULL || *(runlev + 1) == '\0') {
852 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
859 /* Separate the runlevels from the action */
860 action = strchr(runlev, ':');
861 if (action == NULL || *(action + 1) == '\0') {
862 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
869 /* Separate the action from the process */
870 process = strchr(action, ':');
871 if (process == NULL || *(process + 1) == '\0') {
872 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
879 /* Ok, now process it */
881 while (a->name != 0) {
882 if (strcmp(a->name, action) == 0) {
884 strcpy(tmpConsole, "/dev/");
885 strncat(tmpConsole, id, 200);
888 new_initAction(a->action, process, id);
896 /* Choke on an unknown action */
897 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
901 #endif /* CONFIG_FEATURE_USE_INITTAB */
906 extern int init_main(int argc, char **argv)
913 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
915 #ifdef CONFIG_FEATURE_INITRD
916 && strstr(applet_name, "linuxrc") == NULL
922 /* Set up sig handlers -- be sure to
923 * clear all of these in run() */
924 signal(SIGUSR1, halt_signal);
925 signal(SIGUSR2, halt_signal);
926 signal(SIGINT, ctrlaltdel_signal);
927 signal(SIGTERM, reboot_signal);
929 /* Turn off rebooting via CTL-ALT-DEL -- we get a
930 * SIGINT on CAD so we can shut things down gracefully... */
931 init_reboot(RB_DISABLE_CAD);
934 /* Figure out what kernel this is running */
935 kernelVersion = get_kernel_revision();
937 /* Close whatever files are open, and reset the console. */
942 /* Figure out where the default console should be */
949 /* Make sure PATH is set to something sane */
950 putenv("PATH="_PATH_STDPATH);
953 message(MAYBE_CONSOLE|LOG, "init started: %s\n", full_version);
955 /* Make sure there is enough memory to do something useful. */
958 /* Check if we are supposed to be in single user mode */
959 if (argc > 1 && (!strcmp(argv[1], "single") ||
960 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
961 /* Ask first then start a shell on tty2-4 */
962 if (secondConsole != NULL)
963 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
964 if (thirdConsole != NULL)
965 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
966 if (fourthConsole != NULL)
967 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
968 /* Start a shell on tty1 */
969 new_initAction(RESPAWN, LOGIN_SHELL, console);
971 /* Not in single user mode -- see what inittab says */
973 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
974 * then parse_inittab() simply adds in some default
975 * actions(i.e., runs INIT_SCRIPT and then starts a pair
976 * of "askfirst" shells */
980 /* Make the command line just say "init" -- thats all, nothing else */
981 fixup_argv(argc, argv, "init");
983 /* Now run everything that needs to be run */
985 /* First run the sysinit command */
986 run_actions(SYSINIT);
987 /* Next run anything that wants to block */
989 /* Next run anything to be run only once */
990 for (a = initActionList; a; a = tmp) {
992 if (a->action == ONCE) {
993 run(a->process, a->console, FALSE);
994 /* Now remove the "once" entry from the list */
995 delete_initAction(a);
998 /* If there is nothing else to do, stop */
999 if (initActionList == NULL) {
1000 message(LOG | CONSOLE,
1001 "No more tasks for init -- sleeping forever.\n");
1005 /* Now run the looping stuff for the rest of forever */
1007 for (a = initActionList; a; a = a->nextPtr) {
1008 /* Only run stuff with pid==0. If they have
1009 * a pid, that means they are still running */
1011 switch (a->action) {
1013 /* run the respawn stuff */
1014 a->pid = run(a->process, a->console, FALSE);
1017 /* run the askfirst stuff */
1018 a->pid = run(a->process, a->console, TRUE);
1020 /* silence the compiler's incessant whining */
1026 /* Wait for a child process to exit */
1027 wpid = wait(&status);
1029 /* Find out who died and clean up their corpse */
1030 for (a = initActionList; a; a = a->nextPtr) {
1031 if (a->pid == wpid) {
1033 message(LOG, "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1044 c-file-style: "linux"