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>
46 # include <sys/syslog.h>
49 #define bb_need_full_version
50 #define BB_DECLARE_EXTERN
53 /* From <linux/vt.h> */
55 unsigned short v_active; /* active vt */
56 unsigned short v_signal; /* signal to send */
57 unsigned short v_state; /* vt bitmask */
59 static const int VT_GETSTATE = 0x5603; /* get global vt state info */
61 /* From <linux/serial.h> */
62 struct serial_struct {
71 unsigned short close_delay;
72 char reserved_char[2];
74 unsigned short closing_wait; /* time to wait before closing */
75 unsigned short closing_wait2; /* no longer used... */
81 #ifndef RB_HALT_SYSTEM
82 static const int RB_HALT_SYSTEM = 0xcdef0123;
83 static const int RB_ENABLE_CAD = 0x89abcdef;
84 static const int RB_DISABLE_CAD = 0;
85 #define RB_POWER_OFF 0x4321fedc
86 static const int RB_AUTOBOOT = 0x01234567;
87 #if defined(__GLIBC__) || defined (__UCLIBC__)
88 #include <sys/reboot.h>
89 #define init_reboot(magic) reboot(magic)
91 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
96 #define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
100 #if defined BB_FEATURE_INIT_COREDUMPS
102 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
103 * before processes are spawned to set core file size as unlimited.
104 * This is for debugging only. Don't use this is production, unless
105 * you want core dumps lying about....
107 #define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
108 #include <sys/resource.h>
109 #include <sys/time.h>
112 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
114 #if defined(__GLIBC__)
115 #include <sys/kdaemon.h>
117 static _syscall2(int, bdflush, int, func, int, data);
118 #endif /* __GLIBC__ */
121 #define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
122 #define VT_SECONDARY "/dev/tty2" /* Virtual console */
123 #define VT_THIRD "/dev/tty3" /* Virtual console */
124 #define VT_FOURTH "/dev/tty4" /* Virtual console */
125 #define VT_LOG "/dev/tty5" /* Virtual console */
126 #define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
127 #define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
128 #define SHELL "-/bin/sh" /* Default shell */
129 #define INITTAB "/etc/inittab" /* inittab file location */
131 #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
134 static const int LOG = 0x1;
135 static const int CONSOLE = 0x2;
137 /* Allowed init action types */
147 /* A mapping between "inittab" action name strings and action type codes. */
148 typedef struct initActionType {
150 initActionEnum action;
153 static const struct initActionType actions[] = {
154 {"sysinit", SYSINIT},
155 {"respawn", RESPAWN},
156 {"askfirst", ASKFIRST},
159 {"ctrlaltdel", CTRLALTDEL},
163 /* Set up a linked list of initActions, to be read from inittab */
164 typedef struct initActionTag initAction;
165 struct initActionTag {
170 initActionEnum action;
172 initAction *initActionList = NULL;
175 static char *secondConsole = VT_SECONDARY;
176 static char *thirdConsole = VT_THIRD;
177 static char *fourthConsole = VT_FOURTH;
178 static char *log = VT_LOG;
179 static int kernelVersion = 0;
180 static char termType[32] = "TERM=linux";
181 static char console[32] = _PATH_CONSOLE;
183 static void delete_initAction(initAction * action);
186 /* Print a message to the specified device.
187 * Device may be bitwise-or'd from LOG | CONSOLE */
188 static void message(int device, char *fmt, ...)
189 __attribute__ ((format (printf, 2, 3)));
190 static void message(int device, char *fmt, ...)
197 /* Log the message to syslogd */
201 va_start(arguments, fmt);
202 vsnprintf(msg, sizeof(msg), fmt, arguments);
204 openlog("init", 0, LOG_USER);
205 syslog(LOG_USER|LOG_INFO, msg);
209 static int log_fd = -1;
211 /* Take full control of the log tty, and never close it.
212 * It's mine, all mine! Muhahahaha! */
215 /* don't even try to log, because there is no such console */
217 /* log to main console instead */
219 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
221 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
227 if ((device & LOG) && (log_fd >= 0)) {
228 va_start(arguments, fmt);
229 vdprintf(log_fd, fmt, arguments);
234 if (device & CONSOLE) {
235 /* Always send console messages to /dev/console so people will see them. */
238 device_open(_PATH_CONSOLE,
239 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
240 va_start(arguments, fmt);
241 vdprintf(fd, fmt, arguments);
245 fprintf(stderr, "Bummer, can't print: ");
246 va_start(arguments, fmt);
247 vfprintf(stderr, fmt, arguments);
254 /* Set terminal settings to reasonable defaults */
255 void set_term(int fd)
261 /* set control chars */
262 tty.c_cc[VINTR] = 3; /* C-c */
263 tty.c_cc[VQUIT] = 28; /* C-\ */
264 tty.c_cc[VERASE] = 127; /* C-? */
265 tty.c_cc[VKILL] = 21; /* C-u */
266 tty.c_cc[VEOF] = 4; /* C-d */
267 tty.c_cc[VSTART] = 17; /* C-q */
268 tty.c_cc[VSTOP] = 19; /* C-s */
269 tty.c_cc[VSUSP] = 26; /* C-z */
271 /* use line dicipline 0 */
274 /* Make it be sane */
275 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
276 tty.c_cflag |= HUPCL|CLOCAL;
279 tty.c_iflag = ICRNL | IXON | IXOFF;
282 tty.c_oflag = OPOST | ONLCR;
286 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
288 tcsetattr(fd, TCSANOW, &tty);
291 /* How much memory does this machine have?
292 Units are kBytes to avoid overflow on 4GB machines */
293 static int check_free_memory()
296 unsigned int result, u, s=10;
298 if (sysinfo(&info) != 0) {
299 perror_msg("Error checking free memory: ");
303 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
304 * Kernels 2.4.0 return info.mem_unit in bytes. */
307 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
308 result = (info.totalram>>s) + (info.totalswap>>s);
310 if (result < 0) result = INT_MAX;
314 static void console_init()
317 int tried_devcons = 0;
318 int tried_vtprimary = 0;
320 struct serial_struct sr;
323 if ((s = getenv("TERM")) != NULL) {
324 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
327 if ((s = getenv("CONSOLE")) != NULL) {
328 snprintf(console, sizeof(console) - 1, "%s", s);
331 /* sparc kernel supports console=tty[ab] parameter which is also
332 * passed to init, so catch it here */
333 else if ((s = getenv("console")) != NULL) {
334 /* remap tty[ab] to /dev/ttyS[01] */
335 if (strcmp(s, "ttya") == 0)
336 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
337 else if (strcmp(s, "ttyb") == 0)
338 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
342 /* 2.2 kernels: identify the real console backend and try to use it */
343 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
344 /* this is a serial console */
345 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
346 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
347 /* this is linux virtual tty */
348 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
351 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
356 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
357 /* Can't open selected console -- try /dev/console */
358 if (!tried_devcons) {
360 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
363 /* Can't open selected console -- try vt1 */
364 if (!tried_vtprimary) {
366 snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
372 /* Perhaps we should panic here? */
373 snprintf(console, sizeof(console) - 1, "/dev/null");
375 /* check for serial console and disable logging to tty5 & running a
377 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
379 secondConsole = NULL;
381 fourthConsole = NULL;
382 /* Force the TERM setting to vt102 for serial console --
383 * iff TERM is set to linux (the default) */
384 if (strcmp( termType, "TERM=linux" ) == 0)
385 snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
386 message(LOG | CONSOLE,
387 "serial console detected. Disabling virtual terminals.\r\n");
391 message(LOG, "console=%s\n", console);
394 static pid_t run(char *command, char *terminal, int get_enter)
399 char *cmd[255], *cmdpath;
401 static const char press_enter[] =
403 #ifdef CUSTOMIZED_BANNER
404 #include CUSTOMIZED_BANNER
407 "\nPlease press Enter to activate this console. ";
408 char *environment[] = {
410 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
417 if ((pid = fork()) == 0) {
419 ioctl(0, TIOCNOTTY, 0);
425 /* Reset signal handlers set for parent process */
426 signal(SIGUSR1, SIG_DFL);
427 signal(SIGUSR2, SIG_DFL);
428 signal(SIGINT, SIG_DFL);
429 signal(SIGTERM, SIG_DFL);
430 signal(SIGHUP, SIG_DFL);
432 if ((fd = device_open(terminal, O_RDWR)) < 0) {
433 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
439 ioctl(0, TIOCSCTTY, 1);
440 tcsetpgrp(0, getpgrp());
443 if (get_enter == TRUE) {
445 * Save memory by not exec-ing anything large (like a shell)
446 * before the user wants it. This is critical if swap is not
447 * enabled and the system has low memory. Generally this will
448 * be run on the second virtual console, and the first will
449 * be allowed to start a shell or whatever an init script
453 pid_t shell_pgid = getpid();
454 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
455 command, shell_pgid, terminal);
457 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
462 /* Log the process name and args */
463 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
464 shell_pgid, terminal, command);
467 /* See if any special /bin/sh requiring characters are present */
468 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
471 strcpy(buf, "exec ");
472 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
476 /* Convert command (char*) into cmd (char**, one word per string) */
477 for (tmpCmd = command, i = 0;
478 (tmpCmd = strsep(&command, " \t")) != NULL;) {
479 if (*tmpCmd != '\0') {
491 Interactive shells want to see a dash in argv[0]. This
492 typically is handled by login, argv will be setup this
493 way if a dash appears at the front of the command path
497 if (*cmdpath == '-') {
500 /* skip over the dash */
503 /* find the last component in the command pathname */
504 s = get_last_path_component(cmdpath);
506 /* make a new argv[0] */
507 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
508 message(LOG | CONSOLE, "malloc failed");
516 #if defined BB_FEATURE_INIT_COREDUMPS
519 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
521 limit.rlim_cur = RLIM_INFINITY;
522 limit.rlim_max = RLIM_INFINITY;
523 setrlimit(RLIMIT_CORE, &limit);
528 /* Now run it. The new program will take over this PID,
529 * so nothing further in init.c should be run. */
530 execve(cmdpath, cmd, environment);
532 /* We're still here? Some error happened. */
533 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
540 static int waitfor(char *command, char *terminal, int get_enter)
543 int pid = run(command, terminal, get_enter);
546 wpid = wait(&status);
547 if (wpid > 0 && wpid != pid) {
556 /* Make sure there is enough memory to do something useful. *
557 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
558 static void check_memory()
562 if (check_free_memory() > 1000)
565 if (stat("/etc/fstab", &statBuf) == 0) {
566 /* swapon -a requires /proc typically */
567 waitfor("mount proc /proc -t proc", console, FALSE);
568 /* Try to turn on swap */
569 waitfor("swapon -a", console, FALSE);
570 if (check_free_memory() < 1000)
578 "Sorry, your computer does not have enough memory.\r\n");
583 /* Run all commands to be run right before halt/reboot */
584 static void run_lastAction(void)
587 for (a = initActionList; a; a = a->nextPtr) {
588 if (a->action == CTRLALTDEL) {
589 waitfor(a->process, a->console, FALSE);
590 delete_initAction(a);
597 static void shutdown_system(void)
600 /* first disable our SIGHUP signal */
601 signal(SIGHUP, SIG_DFL);
603 /* Allow Ctrl-Alt-Del to reboot system. */
604 init_reboot(RB_ENABLE_CAD);
606 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
609 /* Send signals to every process _except_ pid 1 */
610 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
615 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
619 /* run everything to be run at "ctrlaltdel" */
623 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
624 /* bdflush, kupdate not needed for kernels >2.2.11 */
630 static void halt_signal(int sig)
634 "The system is halted. Press %s or turn off power\r\n",
635 (secondConsole == NULL) /* serial console */
636 ? "Reset" : "CTRL-ALT-DEL");
639 /* allow time for last message to reach serial console */
642 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
643 init_reboot(RB_POWER_OFF);
645 init_reboot(RB_HALT_SYSTEM);
649 static void reboot_signal(int sig)
652 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
655 /* allow time for last message to reach serial console */
658 init_reboot(RB_AUTOBOOT);
662 #if defined BB_FEATURE_INIT_CHROOT
664 #warning BB_FEATURE_INIT_CHROOT is out of date and should be rewritten to us
665 #warning pivot root instead. Do not even bother till this work is done...
666 #warning You have been warned.
668 #if ! defined BB_FEATURE_USE_PROCFS
669 #error Sorry, I depend on the /proc filesystem right now.
672 static void check_chroot(int sig)
674 char *argv_init[2] = { "init", NULL, };
675 char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
676 char rootpath[256], *tc;
679 if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
681 "SIGHUP recived, but could not open proc file\r\n");
685 if (read(fd, rootpath, sizeof(rootpath)) == -1) {
687 "SIGHUP recived, but could not read proc file\r\n");
693 if (rootpath[0] == '\0') {
695 "SIGHUP recived, but new root is not valid: %s\r\n",
701 tc = strrchr(rootpath, '\n');
704 /* Ok, making it this far means we commit */
705 message(CONSOLE, "Please stand by, changing root to `%s'.\r\n",
708 /* kill all other programs first */
709 message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
714 message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
719 /* ok, we don't need /proc anymore. we also assume that the signaling
720 * process left the rest of the filesystems alone for us */
723 /* Ok, now we chroot. Hopefully we only have two things mounted, the
724 * new chroot'd mount point, and the old "/" mount. s,
725 * we go ahead and unmount the old "/". This should trigger the kernel
726 * to set things up the Right Way(tm). */
728 if (!chroot(rootpath))
731 /* If the chroot fails, we are already too far to turn back, so we
732 * continue and hope that executing init below will revive the system */
734 /* close all of our descriptors and open new ones */
738 open("/dev/console", O_RDWR, 0);
742 message(CONSOLE, "Executing real init...\r\n");
743 /* execute init in the (hopefully) new root */
744 execve("/sbin/init", argv_init, envp_init);
747 "ERROR: Could not exec new init. Press %s to reboot.\r\n",
748 (secondConsole == NULL) /* serial console */
749 ? "Reset" : "CTRL-ALT-DEL");
752 #endif /* BB_FEATURE_INIT_CHROOT */
754 #endif /* ! DEBUG_INIT */
756 void new_initAction(initActionEnum action, char *process, char *cons)
758 initAction *newAction;
763 /* If BusyBox detects that a serial console is in use,
764 * then entries not refering to the console or null devices will _not_ be run.
765 * The exception to this rule is the null device.
767 if (secondConsole == NULL && strcmp(cons, console)
768 && strcmp(cons, "/dev/null"))
771 newAction = calloc((size_t) (1), sizeof(initAction));
773 message(LOG | CONSOLE, "Memory allocation failure\n");
777 newAction->nextPtr = initActionList;
778 initActionList = newAction;
779 strncpy(newAction->process, process, 255);
780 newAction->action = action;
781 strncpy(newAction->console, cons, 255);
783 // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
784 // newAction->process, newAction->action, newAction->console);
787 static void delete_initAction(initAction * action)
789 initAction *a, *b = NULL;
791 for (a = initActionList; a; b = a, a = a->nextPtr) {
794 initActionList = a->nextPtr;
796 b->nextPtr = a->nextPtr;
804 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
805 * then parse_inittab() simply adds in some default
806 * actions(i.e runs INIT_SCRIPT and then starts a pair
807 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
808 * _is_ defined, but /etc/inittab is missing, this
809 * results in the same set of default behaviors.
811 void parse_inittab(void)
813 #ifdef BB_FEATURE_USE_INITTAB
815 char buf[256], lineAsRead[256], tmpConsole[256];
816 char *id, *runlev, *action, *process, *eol;
817 const struct initActionType *a = actions;
821 file = fopen(INITTAB, "r");
823 /* No inittab file -- set up some default behavior */
825 /* Swapoff on halt/reboot */
826 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
827 /* Umount all filesystems on halt/reboot */
828 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
829 /* Askfirst shell on tty1 */
830 new_initAction(ASKFIRST, SHELL, console);
831 /* Askfirst shell on tty2 */
832 if (secondConsole != NULL)
833 new_initAction(ASKFIRST, SHELL, secondConsole);
834 /* Askfirst shell on tty3 */
835 if (thirdConsole != NULL)
836 new_initAction(ASKFIRST, SHELL, thirdConsole);
837 /* Askfirst shell on tty4 */
838 if (fourthConsole != NULL)
839 new_initAction(ASKFIRST, SHELL, fourthConsole);
841 new_initAction(SYSINIT, INIT_SCRIPT, console);
844 #ifdef BB_FEATURE_USE_INITTAB
847 while (fgets(buf, 255, file) != NULL) {
849 /* Skip leading spaces */
850 for (id = buf; *id == ' ' || *id == '\t'; id++);
852 /* Skip the line if it's a comment */
853 if (*id == '#' || *id == '\n')
856 /* Trim the trailing \n */
857 eol = strrchr(id, '\n');
861 /* Keep a copy around for posterity's sake (and error msgs) */
862 strcpy(lineAsRead, buf);
864 /* Separate the ID field from the runlevels */
865 runlev = strchr(id, ':');
866 if (runlev == NULL || *(runlev + 1) == '\0') {
867 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
874 /* Separate the runlevels from the action */
875 action = strchr(runlev, ':');
876 if (action == NULL || *(action + 1) == '\0') {
877 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
884 /* Separate the action from the process */
885 process = strchr(action, ':');
886 if (process == NULL || *(process + 1) == '\0') {
887 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
894 /* Ok, now process it */
896 while (a->name != 0) {
897 if (strcmp(a->name, action) == 0) {
901 strcpy(tmpConsole, "/dev/");
902 strncat(tmpConsole, id, 200);
903 if (stat(tmpConsole, &statBuf) != 0) {
904 message(LOG | CONSOLE,
905 "device '%s' does not exist. Did you read the directions?\n",
911 new_initAction(a->action, process, id);
919 /* Choke on an unknown action */
920 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
924 #endif /* BB_FEATURE_USE_INITTAB */
929 extern int init_main(int argc, char **argv)
936 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
938 #ifdef BB_FEATURE_LINUXRC
939 && strstr(applet_name, "linuxrc") == NULL
943 usage("init\n\nInit is the parent of all processes.\n\n"
944 "This version of init is designed to be run only "
947 /* Set up sig handlers -- be sure to
948 * clear all of these in run() */
949 signal(SIGUSR1, halt_signal);
950 signal(SIGUSR2, halt_signal);
951 signal(SIGINT, reboot_signal);
952 signal(SIGTERM, reboot_signal);
953 #if defined BB_FEATURE_INIT_CHROOT
954 signal(SIGHUP, check_chroot);
957 /* Turn off rebooting via CTL-ALT-DEL -- we get a
958 * SIGINT on CAD so we can shut things down gracefully... */
959 init_reboot(RB_DISABLE_CAD);
962 /* Figure out what kernel this is running */
963 kernelVersion = get_kernel_revision();
965 /* Figure out where the default console should be */
968 /* Close whatever files are open, and reset the console. */
976 /* Make sure PATH is set to something sane */
977 putenv(_PATH_STDPATH);
982 #if ! defined BB_FEATURE_EXTRA_QUIET
986 "init started: %s\r\n", full_version);
989 #if ! defined BB_FEATURE_EXTRA_QUIET
993 "init(%d) started: %s\r\n", getpid(), full_version);
997 /* Make sure there is enough memory to do something useful. */
1000 /* Check if we are supposed to be in single user mode */
1001 if (argc > 1 && (!strcmp(argv[1], "single") ||
1002 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
1003 /* Ask first then start a shell on tty2-4 */
1004 if (secondConsole != NULL)
1005 new_initAction(ASKFIRST, SHELL, secondConsole);
1006 if (thirdConsole != NULL)
1007 new_initAction(ASKFIRST, SHELL, thirdConsole);
1008 if (fourthConsole != NULL)
1009 new_initAction(ASKFIRST, SHELL, fourthConsole);
1010 /* Start a shell on tty1 */
1011 new_initAction(RESPAWN, SHELL, console);
1013 /* Not in single user mode -- see what inittab says */
1015 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
1016 * then parse_inittab() simply adds in some default
1017 * actions(i.e runs INIT_SCRIPT and then starts a pair
1018 * of "askfirst" shells */
1022 /* Fix up argv[0] to be certain we claim to be init */
1026 strncpy(argv[1], "\0", strlen(argv[1])+1);
1028 /* Now run everything that needs to be run */
1030 /* First run the sysinit command */
1031 for (a = initActionList; a; a = a->nextPtr) {
1032 if (a->action == SYSINIT) {
1033 waitfor(a->process, a->console, FALSE);
1034 /* Now remove the "sysinit" entry from the list */
1035 delete_initAction(a);
1038 /* Next run anything that wants to block */
1039 for (a = initActionList; a; a = a->nextPtr) {
1040 if (a->action == WAIT) {
1041 waitfor(a->process, a->console, FALSE);
1042 /* Now remove the "wait" entry from the list */
1043 delete_initAction(a);
1046 /* Next run anything to be run only once */
1047 for (a = initActionList; a; a = a->nextPtr) {
1048 if (a->action == ONCE) {
1049 run(a->process, a->console, FALSE);
1050 /* Now remove the "once" entry from the list */
1051 delete_initAction(a);
1054 /* If there is nothing else to do, stop */
1055 if (initActionList == NULL) {
1056 message(LOG | CONSOLE,
1057 "No more tasks for init -- sleeping forever.\n");
1062 /* Now run the looping stuff for the rest of forever */
1064 for (a = initActionList; a; a = a->nextPtr) {
1065 /* Only run stuff with pid==0. If they have
1066 * a pid, that means they are still running */
1068 switch (a->action) {
1070 /* run the respawn stuff */
1071 a->pid = run(a->process, a->console, FALSE);
1074 /* run the askfirst stuff */
1075 a->pid = run(a->process, a->console, TRUE);
1077 /* silence the compiler's incessant whining */
1083 /* Wait for a child process to exit */
1084 wpid = wait(&status);
1086 /* Find out who died and clean up their corpse */
1087 for (a = initActionList; a; a = a->nextPtr) {
1088 if (a->pid == wpid) {
1091 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1102 c-file-style: "linux"