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;
131 /* Allowed init action types */
142 /* A mapping between "inittab" action name strings and action type codes. */
143 typedef struct initActionType {
145 initActionEnum action;
148 static const struct initActionType actions[] = {
149 {"sysinit", SYSINIT},
150 {"respawn", RESPAWN},
151 {"askfirst", ASKFIRST},
154 {"ctrlaltdel", CTRLALTDEL},
155 {"shutdown", SHUTDOWN},
159 /* Set up a linked list of initActions, to be read from inittab */
160 typedef struct initActionTag initAction;
161 struct initActionTag {
166 initActionEnum action;
168 static initAction *initActionList = NULL;
171 static char *secondConsole = VC_2;
172 static char *thirdConsole = VC_3;
173 static char *fourthConsole = VC_4;
174 static char *log = VC_5;
175 static int kernelVersion = 0;
176 static char termType[32] = "TERM=linux";
177 static char console[32] = _PATH_CONSOLE;
179 static void delete_initAction(initAction * action);
181 static void loop_forever(void)
187 /* Print a message to the specified device.
188 * Device may be bitwise-or'd from LOG | CONSOLE */
189 static void message(int device, char *fmt, ...)
190 __attribute__ ((format (printf, 2, 3)));
191 static void message(int device, char *fmt, ...)
196 #ifdef CONFIG_SYSLOGD
198 /* Log the message to syslogd */
202 va_start(arguments, fmt);
203 vsnprintf(msg, sizeof(msg), fmt, arguments);
205 syslog_msg(LOG_USER, LOG_USER|LOG_INFO, msg);
208 static int log_fd = -1;
210 /* Take full control of the log tty, and never close it.
211 * It's mine, all mine! Muhahahaha! */
214 /* don't even try to log, because there is no such console */
216 /* log to main console instead */
218 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
220 fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
225 if ((device & LOG) && (log_fd >= 0)) {
226 va_start(arguments, fmt);
227 vdprintf(log_fd, fmt, arguments);
232 if (device & CONSOLE) {
233 /* Always send console messages to /dev/console so people will see them. */
236 device_open(_PATH_CONSOLE,
237 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
238 va_start(arguments, fmt);
239 vdprintf(fd, fmt, arguments);
243 fprintf(stderr, "Bummer, can't print: ");
244 va_start(arguments, fmt);
245 vfprintf(stderr, fmt, arguments);
251 /* Set terminal settings to reasonable defaults */
252 static void set_term(int fd)
258 /* set control chars */
259 tty.c_cc[VINTR] = 3; /* C-c */
260 tty.c_cc[VQUIT] = 28; /* C-\ */
261 tty.c_cc[VERASE] = 127; /* C-? */
262 tty.c_cc[VKILL] = 21; /* C-u */
263 tty.c_cc[VEOF] = 4; /* C-d */
264 tty.c_cc[VSTART] = 17; /* C-q */
265 tty.c_cc[VSTOP] = 19; /* C-s */
266 tty.c_cc[VSUSP] = 26; /* C-z */
268 /* use line dicipline 0 */
271 /* Make it be sane */
272 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
273 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
277 tty.c_iflag = ICRNL | IXON | IXOFF;
280 tty.c_oflag = OPOST | ONLCR;
284 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
286 tcsetattr(fd, TCSANOW, &tty);
289 /* How much memory does this machine have?
290 Units are kBytes to avoid overflow on 4GB machines */
291 static int check_free_memory(void)
294 unsigned int result, u, s=10;
296 if (sysinfo(&info) != 0) {
297 perror_msg("Error checking free memory");
301 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
302 * Kernels 2.4.0 return info.mem_unit in bytes. */
305 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
306 result = (info.totalram>>s) + (info.totalswap>>s);
308 if (result < 0) result = INT_MAX;
312 static void console_init(void)
315 int tried_devcons = 0;
316 int tried_vtprimary = 0;
318 struct serial_struct sr;
321 if ((s = getenv("TERM")) != NULL) {
322 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
325 if ((s = getenv("CONSOLE")) != NULL) {
326 safe_strncpy(console, s, sizeof(console));
329 /* sparc kernel supports console=tty[ab] parameter which is also
330 * passed to init, so catch it here */
331 else if ((s = getenv("console")) != NULL) {
332 /* remap tty[ab] to /dev/ttyS[01] */
333 if (strcmp(s, "ttya") == 0)
334 safe_strncpy(console, SC_0, sizeof(console));
335 else if (strcmp(s, "ttyb") == 0)
336 safe_strncpy(console, SC_1, sizeof(console));
340 /* 2.2 kernels: identify the real console backend and try to use it */
341 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
342 /* this is a serial console */
343 snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
344 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
345 /* this is linux virtual tty */
346 snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
348 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
353 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
354 /* Can't open selected console -- try /dev/console */
355 if (!tried_devcons) {
357 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
360 /* Can't open selected console -- try vt1 */
361 if (!tried_vtprimary) {
363 safe_strncpy(console, VC_1, sizeof(console));
369 /* Perhaps we should panic here? */
370 safe_strncpy(console, "/dev/null", sizeof(console));
372 /* check for serial console and disable logging to tty5 & running a
374 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
376 secondConsole = NULL;
378 fourthConsole = NULL;
379 /* Force the TERM setting to vt102 for serial console --
380 * iff TERM is set to linux (the default) */
381 if (strcmp( termType, "TERM=linux" ) == 0)
382 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
383 message(LOG | CONSOLE,
384 "serial console detected. Disabling virtual terminals.\n");
388 message(LOG, "console=%s\n", console);
391 static void fixup_argv(int argc, char **argv, char *new_argv0)
394 /* Fix up argv[0] to be certain we claim to be init */
395 len = strlen(argv[0]);
396 memset(argv[0], 0, len);
397 safe_strncpy(argv[0], new_argv0, len + 1);
399 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
402 memset(argv[len], 0, strlen(argv[len]));
408 static pid_t run(char *command, char *terminal, int get_enter)
414 char *cmd[255], *cmdpath;
417 static const char press_enter[] =
419 #ifdef CUSTOMIZED_BANNER
420 #include CUSTOMIZED_BANNER
423 "\nPlease press Enter to activate this console. ";
424 char *environment[MAXENV+1] = {
427 "PATH=" _PATH_STDPATH,
433 /* inherit environment to the child, merging our values -andy */
434 for (i=0; environ[i]; i++) {
435 for (j=0; environment[j]; j++) {
436 s = strchr(environment[j], '=');
437 if (!strncmp(environ[i], environment[j], s - environment[j]))
440 if (!environment[j]) {
441 environment[j++] = environ[i];
442 environment[j] = NULL;
446 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
447 if ((pid = fork()) == 0)
449 if ((pid = vfork()) == 0)
453 ioctl(0, TIOCNOTTY, 0);
459 /* Reset signal handlers set for parent process */
460 signal(SIGUSR1, SIG_DFL);
461 signal(SIGUSR2, SIG_DFL);
462 signal(SIGINT, SIG_DFL);
463 signal(SIGTERM, SIG_DFL);
464 signal(SIGHUP, SIG_DFL);
466 if ((fd = device_open(terminal, O_RDWR)) < 0) {
467 if (stat(terminal, &sb) != 0) {
468 message(LOG | CONSOLE, "device '%s' does not exist.\n",
472 message(LOG | CONSOLE, "Bummer, can't open %s\n", terminal);
478 ioctl(0, TIOCSCTTY, 1);
479 tcsetpgrp(0, getpgrp());
482 /* See if any special /bin/sh requiring characters are present */
483 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
486 strcpy(buf, "exec ");
487 safe_strncpy(buf + sizeof("exec "), command,
488 sizeof(buf) - sizeof("exec "));
492 /* Convert command (char*) into cmd (char**, one word per string) */
493 safe_strncpy(buf, command, sizeof(buf));
495 for (tmpCmd = buf, i = 0;
496 (tmpCmd = strsep(&s, " \t")) != NULL;) {
497 if (*tmpCmd != '\0') {
509 Interactive shells want to see a dash in argv[0]. This
510 typically is handled by login, argv will be setup this
511 way if a dash appears at the front of the command path
515 if (*cmdpath == '-') {
517 /* skip over the dash */
520 /* find the last component in the command pathname */
521 s = get_last_path_component(cmdpath);
523 /* make a new argv[0] */
524 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
525 message(LOG | CONSOLE, "malloc failed");
533 if (get_enter == TRUE) {
535 * Save memory by not exec-ing anything large (like a shell)
536 * before the user wants it. This is critical if swap is not
537 * enabled and the system has low memory. Generally this will
538 * be run on the second virtual console, and the first will
539 * be allowed to start a shell or whatever an init script
543 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\n",
544 cmd[0], getpid(), terminal);
546 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
551 /* Log the process name and args */
552 message(LOG, "Starting pid %d, console %s: '%s'\n",
553 getpid(), terminal, command);
556 #if defined CONFIG_FEATURE_INIT_COREDUMPS
557 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
559 limit.rlim_cur = RLIM_INFINITY;
560 limit.rlim_max = RLIM_INFINITY;
561 setrlimit(RLIMIT_CORE, &limit);
565 /* Now run it. The new program will take over this PID,
566 * so nothing further in init.c should be run. */
567 execve(cmdpath, cmd, environment);
569 /* We're still here? Some error happened. */
570 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
577 static int waitfor(char *command, char *terminal, int get_enter)
580 int pid = run(command, terminal, get_enter);
583 wpid = wait(&status);
584 if (wpid > 0 && wpid != pid) {
593 /* Make sure there is enough memory to do something useful. *
594 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
595 static void check_memory(void)
599 if (check_free_memory() > 1000)
602 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
603 if (stat("/etc/fstab", &statBuf) == 0) {
604 /* swapon -a requires /proc typically */
605 waitfor("mount proc /proc -t proc", console, FALSE);
606 /* Try to turn on swap */
607 waitfor("swapon -a", console, FALSE);
608 if (check_free_memory() < 1000)
617 "Sorry, your computer does not have enough memory.\n");
621 /* Run all commands to be run right before halt/reboot */
622 static void run_actions(initActionEnum action)
625 for (a = initActionList; a; a = tmp) {
627 if (a->action == action) {
628 waitfor(a->process, a->console, FALSE);
629 delete_initAction(a);
636 static void shutdown_system(void)
638 sigset_t block_signals;
640 /* first disable all our signals */
641 sigemptyset(&block_signals);
642 sigaddset(&block_signals, SIGHUP);
643 sigaddset(&block_signals, SIGCHLD);
644 sigaddset(&block_signals, SIGUSR1);
645 sigaddset(&block_signals, SIGUSR2);
646 sigaddset(&block_signals, SIGINT);
647 sigaddset(&block_signals, SIGTERM);
648 sigprocmask(SIG_BLOCK, &block_signals, NULL);
650 /* Allow Ctrl-Alt-Del to reboot system. */
651 init_reboot(RB_ENABLE_CAD);
653 message(CONSOLE|LOG, "\nThe system is going down NOW !!\n");
656 /* Send signals to every process _except_ pid 1 */
657 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\n");
662 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\n");
666 /* run everything to be run at "shutdown" */
667 run_actions(SHUTDOWN);
670 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
671 /* bdflush, kupdate not needed for kernels >2.2.11 */
677 static void halt_signal(int sig)
681 "The system is halted. Press %s or turn off power\n",
682 (secondConsole == NULL) /* serial console */
683 ? "Reset" : "CTRL-ALT-DEL");
686 /* allow time for last message to reach serial console */
689 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
690 init_reboot(RB_POWER_OFF);
692 init_reboot(RB_HALT_SYSTEM);
697 static void reboot_signal(int sig)
700 message(CONSOLE|LOG, "Please stand by while rebooting the system.\n");
703 /* allow time for last message to reach serial console */
706 init_reboot(RB_AUTOBOOT);
711 static void ctrlaltdel_signal(int sig)
713 run_actions(CTRLALTDEL);
716 #endif /* ! DEBUG_INIT */
718 static void new_initAction(initActionEnum action, char *process, char *cons)
720 initAction *newAction;
726 /* If BusyBox detects that a serial console is in use,
727 * then entries not refering to the console or null devices will _not_ be run.
728 * The exception to this rule is the null device.
730 if (secondConsole == NULL && strcmp(cons, console)
731 && strcmp(cons, "/dev/null"))
733 if (strcmp(cons, "/dev/null") == 0 && action == ASKFIRST)
736 newAction = calloc((size_t) (1), sizeof(initAction));
738 message(LOG | CONSOLE, "Memory allocation failure\n");
741 for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
743 a->nextPtr = newAction;
745 initActionList = newAction;
747 safe_strncpy(newAction->process, process, 255);
748 newAction->action = action;
749 safe_strncpy(newAction->console, cons, 255);
751 // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
752 // newAction->process, newAction->action, newAction->console);
755 static void delete_initAction(initAction * action)
757 initAction *a, *b = NULL;
759 for (a = initActionList; a; b = a, a = a->nextPtr) {
762 initActionList = a->nextPtr;
764 b->nextPtr = a->nextPtr;
772 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
773 * then parse_inittab() simply adds in some default
774 * actions(i.e., runs INIT_SCRIPT and then starts a pair
775 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
776 * _is_ defined, but /etc/inittab is missing, this
777 * results in the same set of default behaviors.
779 static void parse_inittab(void)
781 #ifdef CONFIG_FEATURE_USE_INITTAB
783 char buf[256], lineAsRead[256], tmpConsole[256];
784 char *id, *runlev, *action, *process, *eol;
785 const struct initActionType *a = actions;
789 file = fopen(INITTAB, "r");
791 /* No inittab file -- set up some default behavior */
793 /* Reboot on Ctrl-Alt-Del */
794 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
795 /* Umount all filesystems on halt/reboot */
796 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
797 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
798 /* Swapoff on halt/reboot */
799 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
801 /* Askfirst shell on tty1 */
802 new_initAction(ASKFIRST, LOGIN_SHELL, console);
803 /* Askfirst shell on tty2 */
804 if (secondConsole != NULL)
805 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
806 /* Askfirst shell on tty3 */
807 if (thirdConsole != NULL)
808 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
809 /* Askfirst shell on tty4 */
810 if (fourthConsole != NULL)
811 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
813 new_initAction(SYSINIT, INIT_SCRIPT, console);
816 #ifdef CONFIG_FEATURE_USE_INITTAB
819 while (fgets(buf, 255, file) != NULL) {
821 /* Skip leading spaces */
822 for (id = buf; *id == ' ' || *id == '\t'; id++);
824 /* Skip the line if it's a comment */
825 if (*id == '#' || *id == '\n')
828 /* Trim the trailing \n */
829 eol = strrchr(id, '\n');
833 /* Keep a copy around for posterity's sake (and error msgs) */
834 strcpy(lineAsRead, buf);
836 /* Separate the ID field from the runlevels */
837 runlev = strchr(id, ':');
838 if (runlev == NULL || *(runlev + 1) == '\0') {
839 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
846 /* Separate the runlevels from the action */
847 action = strchr(runlev, ':');
848 if (action == NULL || *(action + 1) == '\0') {
849 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
856 /* Separate the action from the process */
857 process = strchr(action, ':');
858 if (process == NULL || *(process + 1) == '\0') {
859 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
866 /* Ok, now process it */
868 while (a->name != 0) {
869 if (strcmp(a->name, action) == 0) {
871 strcpy(tmpConsole, "/dev/");
872 strncat(tmpConsole, id, 200);
875 new_initAction(a->action, process, id);
883 /* Choke on an unknown action */
884 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
888 #endif /* CONFIG_FEATURE_USE_INITTAB */
893 extern int init_main(int argc, char **argv)
900 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
902 #ifdef CONFIG_FEATURE_INITRD
903 && strstr(applet_name, "linuxrc") == NULL
909 /* Set up sig handlers -- be sure to
910 * clear all of these in run() */
911 signal(SIGUSR1, halt_signal);
912 signal(SIGUSR2, halt_signal);
913 signal(SIGINT, ctrlaltdel_signal);
914 signal(SIGTERM, reboot_signal);
916 /* Turn off rebooting via CTL-ALT-DEL -- we get a
917 * SIGINT on CAD so we can shut things down gracefully... */
918 init_reboot(RB_DISABLE_CAD);
921 /* Figure out what kernel this is running */
922 kernelVersion = get_kernel_revision();
924 /* Close whatever files are open, and reset the console. */
929 /* Figure out where the default console should be */
936 /* Make sure PATH is set to something sane */
937 putenv("PATH="_PATH_STDPATH);
942 #if ! defined CONFIG_FEATURE_EXTRA_QUIET
946 "init started: %s\n", full_version);
949 #if ! defined CONFIG_FEATURE_EXTRA_QUIET
953 "init(%d) started: %s\n", getpid(), full_version);
957 /* Make sure there is enough memory to do something useful. */
960 /* Check if we are supposed to be in single user mode */
961 if (argc > 1 && (!strcmp(argv[1], "single") ||
962 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
963 /* Ask first then start a shell on tty2-4 */
964 if (secondConsole != NULL)
965 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
966 if (thirdConsole != NULL)
967 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
968 if (fourthConsole != NULL)
969 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
970 /* Start a shell on tty1 */
971 new_initAction(RESPAWN, LOGIN_SHELL, console);
973 /* Not in single user mode -- see what inittab says */
975 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
976 * then parse_inittab() simply adds in some default
977 * actions(i.e., runs INIT_SCRIPT and then starts a pair
978 * of "askfirst" shells */
982 /* Make the command line just say "init" -- thats all, nothing else */
983 fixup_argv(argc, argv, "init");
985 /* Now run everything that needs to be run */
987 /* First run the sysinit command */
988 run_actions(SYSINIT);
989 /* Next run anything that wants to block */
991 /* Next run anything to be run only once */
992 for (a = initActionList; a; a = tmp) {
994 if (a->action == ONCE) {
995 run(a->process, a->console, FALSE);
996 /* Now remove the "once" entry from the list */
997 delete_initAction(a);
1000 /* If there is nothing else to do, stop */
1001 if (initActionList == NULL) {
1002 message(LOG | CONSOLE,
1003 "No more tasks for init -- sleeping forever.\n");
1007 /* Now run the looping stuff for the rest of forever */
1009 for (a = initActionList; a; a = a->nextPtr) {
1010 /* Only run stuff with pid==0. If they have
1011 * a pid, that means they are still running */
1013 switch (a->action) {
1015 /* run the respawn stuff */
1016 a->pid = run(a->process, a->console, FALSE);
1019 /* run the askfirst stuff */
1020 a->pid = run(a->process, a->console, TRUE);
1022 /* silence the compiler's incessant whining */
1028 /* Wait for a child process to exit */
1029 wpid = wait(&status);
1031 /* Find out who died and clean up their corpse */
1032 for (a = initActionList; a; a = a->nextPtr) {
1033 if (a->pid == wpid) {
1036 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1047 c-file-style: "linux"