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;
184 sig_atomic_t got_cont = 0;
186 static void delete_initAction(initAction * action);
188 static void loop_forever(void)
194 /* Print a message to the specified device.
195 * Device may be bitwise-or'd from LOG | CONSOLE */
197 static inline messageND(int device, char *fmt, ...) { }
199 #define messageND message
201 static void message(int device, char *fmt, ...)
202 __attribute__ ((format (printf, 2, 3)));
203 static void message(int device, char *fmt, ...)
208 #ifdef CONFIG_SYSLOGD
210 /* Log the message to syslogd */
214 va_start(arguments, fmt);
215 vsnprintf(msg, sizeof(msg), fmt, arguments);
217 syslog_msg(LOG_USER, LOG_USER|LOG_INFO, msg);
220 static int log_fd = -1;
222 /* Take full control of the log tty, and never close it.
223 * It's mine, all mine! Muhahahaha! */
226 /* don't even try to log, because there is no such console */
228 /* log to main console instead */
230 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
232 fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
237 if ((device & LOG) && (log_fd >= 0)) {
238 va_start(arguments, fmt);
239 vdprintf(log_fd, fmt, arguments);
244 if (device & CONSOLE) {
245 /* Always send console messages to /dev/console so people will see them. */
248 device_open(_PATH_CONSOLE,
249 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
250 va_start(arguments, fmt);
251 vdprintf(fd, fmt, arguments);
255 fprintf(stderr, "Bummer, can't print: ");
256 va_start(arguments, fmt);
257 vfprintf(stderr, fmt, arguments);
263 /* Set terminal settings to reasonable defaults */
264 static void set_term(int fd)
270 /* set control chars */
271 tty.c_cc[VINTR] = 3; /* C-c */
272 tty.c_cc[VQUIT] = 28; /* C-\ */
273 tty.c_cc[VERASE] = 127; /* C-? */
274 tty.c_cc[VKILL] = 21; /* C-u */
275 tty.c_cc[VEOF] = 4; /* C-d */
276 tty.c_cc[VSTART] = 17; /* C-q */
277 tty.c_cc[VSTOP] = 19; /* C-s */
278 tty.c_cc[VSUSP] = 26; /* C-z */
280 /* use line dicipline 0 */
283 /* Make it be sane */
284 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
285 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
289 tty.c_iflag = ICRNL | IXON | IXOFF;
292 tty.c_oflag = OPOST | ONLCR;
296 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
298 tcsetattr(fd, TCSANOW, &tty);
301 /* How much memory does this machine have?
302 Units are kBytes to avoid overflow on 4GB machines */
303 static int check_free_memory(void)
306 unsigned int result, u, s=10;
308 if (sysinfo(&info) != 0) {
309 perror_msg("Error checking free memory");
313 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
314 * Kernels 2.4.0 return info.mem_unit in bytes. */
317 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
318 result = (info.totalram>>s) + (info.totalswap>>s);
320 if (result < 0) result = INT_MAX;
324 static void console_init(void)
327 int tried_devcons = 0;
328 int tried_vtprimary = 0;
330 struct serial_struct sr;
333 if ((s = getenv("TERM")) != NULL) {
334 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
337 if ((s = getenv("CONSOLE")) != NULL) {
338 safe_strncpy(console, s, sizeof(console));
341 /* sparc kernel supports console=tty[ab] parameter which is also
342 * passed to init, so catch it here */
343 else if ((s = getenv("console")) != NULL) {
344 /* remap tty[ab] to /dev/ttyS[01] */
345 if (strcmp(s, "ttya") == 0)
346 safe_strncpy(console, SC_0, sizeof(console));
347 else if (strcmp(s, "ttyb") == 0)
348 safe_strncpy(console, SC_1, sizeof(console));
352 /* 2.2 kernels: identify the real console backend and try to use it */
353 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
354 /* this is a serial console */
355 snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
356 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
357 /* this is linux virtual tty */
358 snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
360 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
365 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
366 /* Can't open selected console -- try /dev/console */
367 if (!tried_devcons) {
369 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
372 /* Can't open selected console -- try vt1 */
373 if (!tried_vtprimary) {
375 safe_strncpy(console, VC_1, sizeof(console));
381 /* Perhaps we should panic here? */
382 safe_strncpy(console, "/dev/null", sizeof(console));
384 /* check for serial console and disable logging to tty5 & running a
386 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
388 secondConsole = NULL;
390 fourthConsole = NULL;
391 /* Force the TERM setting to vt102 for serial console --
392 * iff TERM is set to linux (the default) */
393 if (strcmp( termType, "TERM=linux" ) == 0)
394 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
395 message(LOG | CONSOLE,
396 "serial console detected. Disabling virtual terminals.\n");
400 message(LOG, "console=%s\n", console);
403 static void fixup_argv(int argc, char **argv, char *new_argv0)
406 /* Fix up argv[0] to be certain we claim to be init */
407 len = strlen(argv[0]);
408 memset(argv[0], 0, len);
409 safe_strncpy(argv[0], new_argv0, len + 1);
411 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
414 memset(argv[len], 0, strlen(argv[len]));
420 static pid_t run(char *command, char *terminal, int get_enter)
426 char *cmd[255], *cmdpath;
429 static const char press_enter[] =
431 #ifdef CUSTOMIZED_BANNER
432 #include CUSTOMIZED_BANNER
435 "\nPlease press Enter to activate this console. ";
436 char *environment[MAXENV+1] = {
439 "PATH=" _PATH_STDPATH,
445 /* inherit environment to the child, merging our values -andy */
446 for (i=0; environ[i]; i++) {
447 for (j=0; environment[j]; j++) {
448 s = strchr(environment[j], '=');
449 if (!strncmp(environ[i], environment[j], s - environment[j]))
452 if (!environment[j]) {
453 environment[j++] = environ[i];
454 environment[j] = NULL;
458 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
459 if ((pid = fork()) == 0)
461 if ((pid = vfork()) == 0)
465 ioctl(0, TIOCNOTTY, 0);
471 /* Reset signal handlers set for parent process */
472 signal(SIGUSR1, SIG_DFL);
473 signal(SIGUSR2, SIG_DFL);
474 signal(SIGINT, SIG_DFL);
475 signal(SIGTERM, SIG_DFL);
476 signal(SIGHUP, SIG_DFL);
477 signal(SIGCONT, SIG_DFL);
478 signal(SIGSTOP, SIG_DFL);
479 signal(SIGTSTP, SIG_DFL);
481 if ((fd = device_open(terminal, O_RDWR)) < 0) {
482 if (stat(terminal, &sb) != 0) {
483 message(LOG | CONSOLE, "device '%s' does not exist.\n",
487 message(LOG | CONSOLE, "Bummer, can't open %s\n", terminal);
493 ioctl(0, TIOCSCTTY, 1);
494 tcsetpgrp(0, getpgrp());
497 /* See if any special /bin/sh requiring characters are present */
498 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
501 strcpy(buf, "exec ");
502 safe_strncpy(buf + sizeof("exec "), command,
503 sizeof(buf) - sizeof("exec "));
507 /* Convert command (char*) into cmd (char**, one word per string) */
508 safe_strncpy(buf, command, sizeof(buf));
510 for (tmpCmd = buf, i = 0;
511 (tmpCmd = strsep(&s, " \t")) != NULL;) {
512 if (*tmpCmd != '\0') {
524 Interactive shells want to see a dash in argv[0]. This
525 typically is handled by login, argv will be setup this
526 way if a dash appears at the front of the command path
530 if (*cmdpath == '-') {
532 /* skip over the dash */
535 /* find the last component in the command pathname */
536 s = get_last_path_component(cmdpath);
538 /* make a new argv[0] */
539 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
540 message(LOG | CONSOLE, "malloc failed");
548 if (get_enter == TRUE) {
550 * Save memory by not exec-ing anything large (like a shell)
551 * before the user wants it. This is critical if swap is not
552 * enabled and the system has low memory. Generally this will
553 * be run on the second virtual console, and the first will
554 * be allowed to start a shell or whatever an init script
557 messageND(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\n",
558 cmd[0], getpid(), terminal);
559 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
563 /* Log the process name and args */
564 messageND(LOG, "Starting pid %d, console %s: '%s'\n",
565 getpid(), terminal, command);
567 #if defined CONFIG_FEATURE_INIT_COREDUMPS
568 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
570 limit.rlim_cur = RLIM_INFINITY;
571 limit.rlim_max = RLIM_INFINITY;
572 setrlimit(RLIMIT_CORE, &limit);
576 /* Now run it. The new program will take over this PID,
577 * so nothing further in init.c should be run. */
578 execve(cmdpath, cmd, environment);
580 /* We're still here? Some error happened. */
581 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
588 static int waitfor(char *command, char *terminal, int get_enter)
591 int pid = run(command, terminal, get_enter);
594 wpid = wait(&status);
595 if (wpid > 0 && wpid != pid) {
604 /* Make sure there is enough memory to do something useful. *
605 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
606 static void check_memory(void)
610 if (check_free_memory() > 1000)
613 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
614 if (stat("/etc/fstab", &statBuf) == 0) {
615 /* swapon -a requires /proc typically */
616 waitfor("mount proc /proc -t proc", console, FALSE);
617 /* Try to turn on swap */
618 waitfor("swapon -a", console, FALSE);
619 if (check_free_memory() < 1000)
628 "Sorry, your computer does not have enough memory.\n");
632 /* Run all commands to be run right before halt/reboot */
633 static void run_actions(initActionEnum action)
636 for (a = initActionList; a; a = tmp) {
638 if (a->action == action) {
639 waitfor(a->process, a->console, FALSE);
640 delete_initAction(a);
647 static void shutdown_system(void)
649 sigset_t block_signals;
651 /* first disable all our signals */
652 sigemptyset(&block_signals);
653 sigaddset(&block_signals, SIGHUP);
654 sigaddset(&block_signals, SIGCHLD);
655 sigaddset(&block_signals, SIGUSR1);
656 sigaddset(&block_signals, SIGUSR2);
657 sigaddset(&block_signals, SIGINT);
658 sigaddset(&block_signals, SIGTERM);
659 sigaddset(&block_signals, SIGCONT);
660 sigaddset(&block_signals, SIGSTOP);
661 sigaddset(&block_signals, SIGTSTP);
662 sigprocmask(SIG_BLOCK, &block_signals, NULL);
664 /* Allow Ctrl-Alt-Del to reboot system. */
665 init_reboot(RB_ENABLE_CAD);
667 message(CONSOLE|LOG, "\nThe system is going down NOW !!\n");
670 /* Send signals to every process _except_ pid 1 */
671 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\n");
676 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\n");
680 /* run everything to be run at "shutdown" */
681 run_actions(SHUTDOWN);
684 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
685 /* bdflush, kupdate not needed for kernels >2.2.11 */
691 static void halt_signal(int sig)
696 /* Seems the s390 console is Wierd(tm). */
697 "The system is halted. You may reboot now.\n"
699 /* secondConsole is NULL for a serial console */
700 "The system is halted. Press %s or turn off power\n",
701 (secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
706 /* allow time for last message to reach serial console */
709 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
710 init_reboot(RB_POWER_OFF);
712 init_reboot(RB_HALT_SYSTEM);
717 static void reboot_signal(int sig)
720 message(CONSOLE|LOG, "Please stand by while rebooting the system.\n");
723 /* allow time for last message to reach serial console */
726 init_reboot(RB_AUTOBOOT);
731 static void ctrlaltdel_signal(int sig)
733 run_actions(CTRLALTDEL);
737 * The SIGSTOP & SIGTSTP handler
739 static void stop_handler(int sig)
741 int saved_errno = errno;
744 while(!got_cont) pause();
750 * The SIGCONT handler
752 static void cont_handler(int sig)
757 #endif /* ! DEBUG_INIT */
759 static void new_initAction(initActionEnum action, char *process, char *cons)
761 initAction *newAction;
767 /* If BusyBox detects that a serial console is in use,
768 * then entries not refering to the console or null devices will _not_ be run.
769 * The exception to this rule is the null device.
771 if (secondConsole == NULL && strcmp(cons, console)
772 && strcmp(cons, "/dev/null"))
774 if (strcmp(cons, "/dev/null") == 0 && action == ASKFIRST)
777 newAction = calloc((size_t) (1), sizeof(initAction));
779 message(LOG | CONSOLE, "Memory allocation failure\n");
782 for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
784 a->nextPtr = newAction;
786 initActionList = newAction;
788 safe_strncpy(newAction->process, process, 255);
789 newAction->action = action;
790 safe_strncpy(newAction->console, cons, 255);
792 // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
793 // newAction->process, newAction->action, newAction->console);
796 static void delete_initAction(initAction * action)
798 initAction *a, *b = NULL;
800 for (a = initActionList; a; b = a, a = a->nextPtr) {
803 initActionList = a->nextPtr;
805 b->nextPtr = a->nextPtr;
813 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
814 * then parse_inittab() simply adds in some default
815 * actions(i.e., runs INIT_SCRIPT and then starts a pair
816 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
817 * _is_ defined, but /etc/inittab is missing, this
818 * results in the same set of default behaviors.
820 static void parse_inittab(void)
822 #ifdef CONFIG_FEATURE_USE_INITTAB
824 char buf[256], lineAsRead[256], tmpConsole[256];
825 char *id, *runlev, *action, *process, *eol;
826 const struct initActionType *a = actions;
830 file = fopen(INITTAB, "r");
832 /* No inittab file -- set up some default behavior */
834 /* Reboot on Ctrl-Alt-Del */
835 new_initAction(CTRLALTDEL, "/sbin/reboot", console);
836 /* Umount all filesystems on halt/reboot */
837 new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
838 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
839 /* Swapoff on halt/reboot */
840 new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
842 /* Askfirst shell on tty1 */
843 new_initAction(ASKFIRST, LOGIN_SHELL, console);
844 /* Askfirst shell on tty2 */
845 if (secondConsole != NULL)
846 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
847 /* Askfirst shell on tty3 */
848 if (thirdConsole != NULL)
849 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
850 /* Askfirst shell on tty4 */
851 if (fourthConsole != NULL)
852 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
854 new_initAction(SYSINIT, INIT_SCRIPT, console);
857 #ifdef CONFIG_FEATURE_USE_INITTAB
860 while (fgets(buf, 255, file) != NULL) {
862 /* Skip leading spaces */
863 for (id = buf; *id == ' ' || *id == '\t'; id++);
865 /* Skip the line if it's a comment */
866 if (*id == '#' || *id == '\n')
869 /* Trim the trailing \n */
870 eol = strrchr(id, '\n');
874 /* Keep a copy around for posterity's sake (and error msgs) */
875 strcpy(lineAsRead, buf);
877 /* Separate the ID field from the runlevels */
878 runlev = strchr(id, ':');
879 if (runlev == NULL || *(runlev + 1) == '\0') {
880 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
887 /* Separate the runlevels from the action */
888 action = strchr(runlev, ':');
889 if (action == NULL || *(action + 1) == '\0') {
890 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
897 /* Separate the action from the process */
898 process = strchr(action, ':');
899 if (process == NULL || *(process + 1) == '\0') {
900 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
907 /* Ok, now process it */
909 while (a->name != 0) {
910 if (strcmp(a->name, action) == 0) {
912 strcpy(tmpConsole, "/dev/");
913 strncat(tmpConsole, id, 200);
916 new_initAction(a->action, process, id);
924 /* Choke on an unknown action */
925 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
929 #endif /* CONFIG_FEATURE_USE_INITTAB */
934 extern int init_main(int argc, char **argv)
941 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
943 #ifdef CONFIG_FEATURE_INITRD
944 && strstr(applet_name, "linuxrc") == NULL
950 /* Set up sig handlers -- be sure to
951 * clear all of these in run() */
952 signal(SIGUSR1, halt_signal);
953 signal(SIGUSR2, halt_signal);
954 signal(SIGINT, ctrlaltdel_signal);
955 signal(SIGTERM, reboot_signal);
956 signal(SIGCONT, cont_handler);
957 signal(SIGSTOP, stop_handler);
958 signal(SIGTSTP, stop_handler);
960 /* Turn off rebooting via CTL-ALT-DEL -- we get a
961 * SIGINT on CAD so we can shut things down gracefully... */
962 init_reboot(RB_DISABLE_CAD);
965 /* Figure out what kernel this is running */
966 kernelVersion = get_kernel_revision();
968 /* Close whatever files are open, and reset the console. */
973 /* Figure out where the default console should be */
980 /* Make sure PATH is set to something sane */
981 putenv("PATH="_PATH_STDPATH);
984 message(MAYBE_CONSOLE|LOG, "init started: %s\n", full_version);
986 /* Make sure there is enough memory to do something useful. */
989 /* Check if we are supposed to be in single user mode */
990 if (argc > 1 && (!strcmp(argv[1], "single") ||
991 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
992 /* Ask first then start a shell on tty2-4 */
993 if (secondConsole != NULL)
994 new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole);
995 if (thirdConsole != NULL)
996 new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole);
997 if (fourthConsole != NULL)
998 new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole);
999 /* Start a shell on tty1 */
1000 new_initAction(RESPAWN, LOGIN_SHELL, console);
1002 /* Not in single user mode -- see what inittab says */
1004 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
1005 * then parse_inittab() simply adds in some default
1006 * actions(i.e., runs INIT_SCRIPT and then starts a pair
1007 * of "askfirst" shells */
1011 /* Make the command line just say "init" -- thats all, nothing else */
1012 fixup_argv(argc, argv, "init");
1014 /* Now run everything that needs to be run */
1016 /* First run the sysinit command */
1017 run_actions(SYSINIT);
1018 /* Next run anything that wants to block */
1020 /* Next run anything to be run only once */
1021 for (a = initActionList; a; a = tmp) {
1023 if (a->action == ONCE) {
1024 run(a->process, a->console, FALSE);
1025 /* Now remove the "once" entry from the list */
1026 delete_initAction(a);
1029 /* If there is nothing else to do, stop */
1030 if (initActionList == NULL) {
1031 message(LOG | CONSOLE,
1032 "No more tasks for init -- sleeping forever.\n");
1036 /* Now run the looping stuff for the rest of forever */
1038 for (a = initActionList; a; a = a->nextPtr) {
1039 /* Only run stuff with pid==0. If they have
1040 * a pid, that means they are still running */
1042 switch (a->action) {
1044 /* run the respawn stuff */
1045 a->pid = run(a->process, a->console, FALSE);
1048 /* run the askfirst stuff */
1049 a->pid = run(a->process, a->console, TRUE);
1051 /* silence the compiler's incessant whining */
1057 /* Wait for a child process to exit */
1058 wpid = wait(&status);
1060 /* Find out who died and clean up their corpse */
1061 for (a = initActionList; a; a = a->nextPtr) {
1062 if (a->pid == wpid) {
1064 message(LOG, "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1075 c-file-style: "linux"