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.
41 #include <sys/fcntl.h>
42 #include <sys/ioctl.h>
43 #include <sys/mount.h>
44 #include <sys/types.h>
47 # include <sys/syslog.h>
50 #define bb_need_full_version
51 #define BB_DECLARE_EXTERN
54 /* From <linux/vt.h> */
56 unsigned short v_active; /* active vt */
57 unsigned short v_signal; /* signal to send */
58 unsigned short v_state; /* vt bitmask */
60 static const int VT_GETSTATE = 0x5603; /* get global vt state info */
62 /* From <linux/serial.h> */
63 struct serial_struct {
72 unsigned short close_delay;
73 char reserved_char[2];
75 unsigned short closing_wait; /* time to wait before closing */
76 unsigned short closing_wait2; /* no longer used... */
82 #ifndef RB_HALT_SYSTEM
83 static const int RB_HALT_SYSTEM = 0xcdef0123;
84 static const int RB_ENABLE_CAD = 0x89abcdef;
85 static const int RB_DISABLE_CAD = 0;
86 #define RB_POWER_OFF 0x4321fedc
87 static const int RB_AUTOBOOT = 0x01234567;
88 #if defined(__GLIBC__) || defined (__UCLIBC__)
89 #include <sys/reboot.h>
90 #define init_reboot(magic) reboot(magic)
92 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
97 #define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
101 #if defined BB_FEATURE_INIT_COREDUMPS
103 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
104 * before processes are spawned to set core file size as unlimited.
105 * This is for debugging only. Don't use this is production, unless
106 * you want core dumps lying about....
108 #define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
109 #include <sys/resource.h>
110 #include <sys/time.h>
113 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
115 #if defined(__GLIBC__)
116 #include <sys/kdaemon.h>
118 #include <sys/syscall.h>
119 #include <linux/unistd.h>
120 static _syscall2(int, bdflush, int, func, int, data);
121 #endif /* __GLIBC__ */
124 #define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
125 #define VT_SECONDARY "/dev/tty2" /* Virtual console */
126 #define VT_THIRD "/dev/tty3" /* Virtual console */
127 #define VT_FOURTH "/dev/tty4" /* Virtual console */
128 #define VT_LOG "/dev/tty5" /* Virtual console */
129 #define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
130 #define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
131 #define SHELL "-/bin/sh" /* Default shell */
132 #define INITTAB "/etc/inittab" /* inittab file location */
134 #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
137 static const int LOG = 0x1;
138 static const int CONSOLE = 0x2;
140 /* Allowed init action types */
150 /* A mapping between "inittab" action name strings and action type codes. */
151 typedef struct initActionType {
153 initActionEnum action;
156 static const struct initActionType actions[] = {
157 {"sysinit", SYSINIT},
158 {"respawn", RESPAWN},
159 {"askfirst", ASKFIRST},
162 {"ctrlaltdel", CTRLALTDEL},
166 /* Set up a linked list of initActions, to be read from inittab */
167 typedef struct initActionTag initAction;
168 struct initActionTag {
173 initActionEnum action;
175 initAction *initActionList = NULL;
178 static char *secondConsole = VT_SECONDARY;
179 static char *thirdConsole = VT_THIRD;
180 static char *fourthConsole = VT_FOURTH;
181 static char *log = VT_LOG;
182 static int kernelVersion = 0;
183 static char termType[32] = "TERM=linux";
184 static char console[32] = _PATH_CONSOLE;
186 static void delete_initAction(initAction * action);
189 /* Print a message to the specified device.
190 * Device may be bitwise-or'd from LOG | CONSOLE */
191 static void message(int device, char *fmt, ...)
192 __attribute__ ((format (printf, 2, 3)));
193 static void message(int device, char *fmt, ...)
200 /* Log the message to syslogd */
204 va_start(arguments, fmt);
205 vsnprintf(msg, sizeof(msg), fmt, arguments);
207 openlog("init", 0, LOG_USER);
208 syslog(LOG_USER|LOG_INFO, msg);
212 static int log_fd = -1;
214 /* Take full control of the log tty, and never close it.
215 * It's mine, all mine! Muhahahaha! */
218 /* don't even try to log, because there is no such console */
220 /* log to main console instead */
222 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
224 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
230 if ((device & LOG) && (log_fd >= 0)) {
231 va_start(arguments, fmt);
232 vdprintf(log_fd, fmt, arguments);
237 if (device & CONSOLE) {
238 /* Always send console messages to /dev/console so people will see them. */
241 device_open(_PATH_CONSOLE,
242 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
243 va_start(arguments, fmt);
244 vdprintf(fd, fmt, arguments);
248 fprintf(stderr, "Bummer, can't print: ");
249 va_start(arguments, fmt);
250 vfprintf(stderr, fmt, arguments);
257 /* Set terminal settings to reasonable defaults */
258 void set_term(int fd)
264 /* set control chars */
265 tty.c_cc[VINTR] = 3; /* C-c */
266 tty.c_cc[VQUIT] = 28; /* C-\ */
267 tty.c_cc[VERASE] = 127; /* C-? */
268 tty.c_cc[VKILL] = 21; /* C-u */
269 tty.c_cc[VEOF] = 4; /* C-d */
270 tty.c_cc[VSTART] = 17; /* C-q */
271 tty.c_cc[VSTOP] = 19; /* C-s */
272 tty.c_cc[VSUSP] = 26; /* C-z */
274 /* use line dicipline 0 */
277 /* Make it be sane */
278 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
279 tty.c_cflag |= HUPCL|CLOCAL;
282 tty.c_iflag = ICRNL | IXON | IXOFF;
285 tty.c_oflag = OPOST | ONLCR;
289 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
291 tcsetattr(fd, TCSANOW, &tty);
294 /* How much memory does this machine have?
295 Units are kBytes to avoid overflow on 4GB machines */
296 static int check_free_memory()
299 unsigned int result, u, s=10;
301 if (sysinfo(&info) != 0) {
302 perror_msg("Error checking free memory: ");
306 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
307 * Kernels 2.4.0 return info.mem_unit in bytes. */
310 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
311 result = (info.totalram>>s) + (info.totalswap>>s);
313 if (result < 0) result = INT_MAX;
317 static void console_init()
320 int tried_devcons = 0;
321 int tried_vtprimary = 0;
323 struct serial_struct sr;
326 if ((s = getenv("TERM")) != NULL) {
327 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
330 if ((s = getenv("CONSOLE")) != NULL) {
331 snprintf(console, sizeof(console) - 1, "%s", s);
334 /* sparc kernel supports console=tty[ab] parameter which is also
335 * passed to init, so catch it here */
336 else if ((s = getenv("console")) != NULL) {
337 /* remap tty[ab] to /dev/ttyS[01] */
338 if (strcmp(s, "ttya") == 0)
339 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
340 else if (strcmp(s, "ttyb") == 0)
341 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
345 /* 2.2 kernels: identify the real console backend and try to use it */
346 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
347 /* this is a serial console */
348 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
349 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
350 /* this is linux virtual tty */
351 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
354 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
359 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
360 /* Can't open selected console -- try /dev/console */
361 if (!tried_devcons) {
363 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
366 /* Can't open selected console -- try vt1 */
367 if (!tried_vtprimary) {
369 snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
375 /* Perhaps we should panic here? */
376 snprintf(console, sizeof(console) - 1, "/dev/null");
378 /* check for serial console and disable logging to tty5 & running a
380 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
382 secondConsole = NULL;
384 fourthConsole = NULL;
385 /* Force the TERM setting to vt102 for serial console --
386 * iff TERM is set to linux (the default) */
387 if (strcmp( termType, "TERM=linux" ) == 0)
388 snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
389 message(LOG | CONSOLE,
390 "serial console detected. Disabling virtual terminals.\r\n");
394 message(LOG, "console=%s\n", console);
397 static pid_t run(char *command, char *terminal, int get_enter)
402 char *cmd[255], *cmdpath;
404 static const char press_enter[] =
406 #ifdef CUSTOMIZED_BANNER
407 #include CUSTOMIZED_BANNER
410 "\nPlease press Enter to activate this console. ";
411 char *environment[] = {
413 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
420 if ((pid = fork()) == 0) {
422 ioctl(0, TIOCNOTTY, 0);
428 /* Reset signal handlers set for parent process */
429 signal(SIGUSR1, SIG_DFL);
430 signal(SIGUSR2, SIG_DFL);
431 signal(SIGINT, SIG_DFL);
432 signal(SIGTERM, SIG_DFL);
433 signal(SIGHUP, SIG_DFL);
435 if ((fd = device_open(terminal, O_RDWR)) < 0) {
436 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
442 ioctl(0, TIOCSCTTY, 1);
443 tcsetpgrp(0, getpgrp());
446 if (get_enter == TRUE) {
448 * Save memory by not exec-ing anything large (like a shell)
449 * before the user wants it. This is critical if swap is not
450 * enabled and the system has low memory. Generally this will
451 * be run on the second virtual console, and the first will
452 * be allowed to start a shell or whatever an init script
456 pid_t shell_pgid = getpid();
457 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
458 command, shell_pgid, terminal);
460 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
465 /* Log the process name and args */
466 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
467 shell_pgid, terminal, command);
470 /* See if any special /bin/sh requiring characters are present */
471 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
474 strcpy(buf, "exec ");
475 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
479 /* Convert command (char*) into cmd (char**, one word per string) */
480 for (tmpCmd = command, i = 0;
481 (tmpCmd = strsep(&command, " \t")) != NULL;) {
482 if (*tmpCmd != '\0') {
494 Interactive shells want to see a dash in argv[0]. This
495 typically is handled by login, argv will be setup this
496 way if a dash appears at the front of the command path
500 if (*cmdpath == '-') {
503 /* skip over the dash */
506 /* find the last component in the command pathname */
507 s = get_last_path_component(cmdpath);
509 /* make a new argv[0] */
510 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
511 message(LOG | CONSOLE, "malloc failed");
519 #if defined BB_FEATURE_INIT_COREDUMPS
522 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
524 limit.rlim_cur = RLIM_INFINITY;
525 limit.rlim_max = RLIM_INFINITY;
526 setrlimit(RLIMIT_CORE, &limit);
531 /* Now run it. The new program will take over this PID,
532 * so nothing further in init.c should be run. */
533 execve(cmdpath, cmd, environment);
535 /* We're still here? Some error happened. */
536 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
543 static int waitfor(char *command, char *terminal, int get_enter)
546 int pid = run(command, terminal, get_enter);
549 wpid = wait(&status);
550 if (wpid > 0 && wpid != pid) {
559 /* Make sure there is enough memory to do something useful. *
560 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
561 static void check_memory()
565 if (check_free_memory() > 1000)
568 if (stat("/etc/fstab", &statBuf) == 0) {
569 /* swapon -a requires /proc typically */
570 waitfor("mount proc /proc -t proc", console, FALSE);
571 /* Try to turn on swap */
572 waitfor("swapon -a", console, FALSE);
573 if (check_free_memory() < 1000)
581 "Sorry, your computer does not have enough memory.\r\n");
586 /* Run all commands to be run right before halt/reboot */
587 static void run_lastAction(void)
590 for (a = initActionList; a; a = a->nextPtr) {
591 if (a->action == CTRLALTDEL) {
592 waitfor(a->process, a->console, FALSE);
593 delete_initAction(a);
600 static void shutdown_system(void)
603 /* first disable our SIGHUP signal */
604 signal(SIGHUP, SIG_DFL);
606 /* Allow Ctrl-Alt-Del to reboot system. */
607 init_reboot(RB_ENABLE_CAD);
609 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
612 /* Send signals to every process _except_ pid 1 */
613 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
618 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
622 /* run everything to be run at "ctrlaltdel" */
626 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
627 /* bdflush, kupdate not needed for kernels >2.2.11 */
633 static void halt_signal(int sig)
637 "The system is halted. Press %s or turn off power\r\n",
638 (secondConsole == NULL) /* serial console */
639 ? "Reset" : "CTRL-ALT-DEL");
642 /* allow time for last message to reach serial console */
645 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
646 init_reboot(RB_POWER_OFF);
648 init_reboot(RB_HALT_SYSTEM);
652 static void reboot_signal(int sig)
655 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
658 /* allow time for last message to reach serial console */
661 init_reboot(RB_AUTOBOOT);
665 #if defined BB_FEATURE_INIT_CHROOT
667 #warning BB_FEATURE_INIT_CHROOT is out of date and should be rewritten to us
668 #warning pivot root instead. Do not even bother till this work is done...
669 #warning You have been warned.
671 #if ! defined BB_FEATURE_USE_PROCFS
672 #error Sorry, I depend on the /proc filesystem right now.
675 static void check_chroot(int sig)
677 char *argv_init[2] = { "init", NULL, };
678 char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
679 char rootpath[256], *tc;
682 if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
684 "SIGHUP recived, but could not open proc file\r\n");
688 if (read(fd, rootpath, sizeof(rootpath)) == -1) {
690 "SIGHUP recived, but could not read proc file\r\n");
696 if (rootpath[0] == '\0') {
698 "SIGHUP recived, but new root is not valid: %s\r\n",
704 tc = strrchr(rootpath, '\n');
707 /* Ok, making it this far means we commit */
708 message(CONSOLE, "Please stand by, changing root to `%s'.\r\n",
711 /* kill all other programs first */
712 message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
717 message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
722 /* ok, we don't need /proc anymore. we also assume that the signaling
723 * process left the rest of the filesystems alone for us */
726 /* Ok, now we chroot. Hopefully we only have two things mounted, the
727 * new chroot'd mount point, and the old "/" mount. s,
728 * we go ahead and unmount the old "/". This should trigger the kernel
729 * to set things up the Right Way(tm). */
731 if (!chroot(rootpath))
734 /* If the chroot fails, we are already too far to turn back, so we
735 * continue and hope that executing init below will revive the system */
737 /* close all of our descriptors and open new ones */
741 open("/dev/console", O_RDWR, 0);
745 message(CONSOLE, "Executing real init...\r\n");
746 /* execute init in the (hopefully) new root */
747 execve("/sbin/init", argv_init, envp_init);
750 "ERROR: Could not exec new init. Press %s to reboot.\r\n",
751 (secondConsole == NULL) /* serial console */
752 ? "Reset" : "CTRL-ALT-DEL");
755 #endif /* BB_FEATURE_INIT_CHROOT */
757 #endif /* ! DEBUG_INIT */
759 void new_initAction(initActionEnum action, char *process, char *cons)
761 initAction *newAction;
766 /* If BusyBox detects that a serial console is in use,
767 * then entries not refering to the console or null devices will _not_ be run.
768 * The exception to this rule is the null device.
770 if (secondConsole == NULL && strcmp(cons, console)
771 && strcmp(cons, "/dev/null"))
774 newAction = calloc((size_t) (1), sizeof(initAction));
776 message(LOG | CONSOLE, "Memory allocation failure\n");
780 newAction->nextPtr = initActionList;
781 initActionList = newAction;
782 strncpy(newAction->process, process, 255);
783 newAction->action = action;
784 strncpy(newAction->console, cons, 255);
786 // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
787 // newAction->process, newAction->action, newAction->console);
790 static void delete_initAction(initAction * action)
792 initAction *a, *b = NULL;
794 for (a = initActionList; a; b = a, a = a->nextPtr) {
797 initActionList = a->nextPtr;
799 b->nextPtr = a->nextPtr;
807 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
808 * then parse_inittab() simply adds in some default
809 * actions(i.e runs INIT_SCRIPT and then starts a pair
810 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
811 * _is_ defined, but /etc/inittab is missing, this
812 * results in the same set of default behaviors.
814 void parse_inittab(void)
816 #ifdef BB_FEATURE_USE_INITTAB
818 char buf[256], lineAsRead[256], tmpConsole[256];
819 char *id, *runlev, *action, *process, *eol;
820 const struct initActionType *a = actions;
824 file = fopen(INITTAB, "r");
826 /* No inittab file -- set up some default behavior */
828 /* Swapoff on halt/reboot */
829 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
830 /* Umount all filesystems on halt/reboot */
831 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
832 /* Askfirst shell on tty1 */
833 new_initAction(ASKFIRST, SHELL, console);
834 /* Askfirst shell on tty2 */
835 if (secondConsole != NULL)
836 new_initAction(ASKFIRST, SHELL, secondConsole);
837 /* Askfirst shell on tty3 */
838 if (thirdConsole != NULL)
839 new_initAction(ASKFIRST, SHELL, thirdConsole);
840 /* Askfirst shell on tty4 */
841 if (fourthConsole != NULL)
842 new_initAction(ASKFIRST, SHELL, fourthConsole);
844 new_initAction(SYSINIT, INIT_SCRIPT, console);
847 #ifdef BB_FEATURE_USE_INITTAB
850 while (fgets(buf, 255, file) != NULL) {
852 /* Skip leading spaces */
853 for (id = buf; *id == ' ' || *id == '\t'; id++);
855 /* Skip the line if it's a comment */
856 if (*id == '#' || *id == '\n')
859 /* Trim the trailing \n */
860 eol = strrchr(id, '\n');
864 /* Keep a copy around for posterity's sake (and error msgs) */
865 strcpy(lineAsRead, buf);
867 /* Separate the ID field from the runlevels */
868 runlev = strchr(id, ':');
869 if (runlev == NULL || *(runlev + 1) == '\0') {
870 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
877 /* Separate the runlevels from the action */
878 action = strchr(runlev, ':');
879 if (action == NULL || *(action + 1) == '\0') {
880 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
887 /* Separate the action from the process */
888 process = strchr(action, ':');
889 if (process == NULL || *(process + 1) == '\0') {
890 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
897 /* Ok, now process it */
899 while (a->name != 0) {
900 if (strcmp(a->name, action) == 0) {
904 strcpy(tmpConsole, "/dev/");
905 strncat(tmpConsole, id, 200);
906 if (stat(tmpConsole, &statBuf) != 0) {
907 message(LOG | CONSOLE,
908 "device '%s' does not exist. Did you read the directions?\n",
914 new_initAction(a->action, process, id);
922 /* Choke on an unknown action */
923 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
927 #endif /* BB_FEATURE_USE_INITTAB */
932 extern int init_main(int argc, char **argv)
939 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
941 #ifdef BB_FEATURE_LINUXRC
942 && strstr(applet_name, "linuxrc") == NULL
946 usage("init\n\nInit is the parent of all processes.\n\n"
947 "This version of init is designed to be run only "
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, reboot_signal);
955 signal(SIGTERM, reboot_signal);
956 #if defined BB_FEATURE_INIT_CHROOT
957 signal(SIGHUP, check_chroot);
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 /* Figure out where the default console should be */
971 /* Close whatever files are open, and reset the console. */
979 /* Make sure PATH is set to something sane */
980 putenv(_PATH_STDPATH);
985 #if ! defined BB_FEATURE_EXTRA_QUIET
989 "init started: %s\r\n", full_version);
992 #if ! defined BB_FEATURE_EXTRA_QUIET
996 "init(%d) started: %s\r\n", getpid(), full_version);
1000 /* Make sure there is enough memory to do something useful. */
1003 /* Check if we are supposed to be in single user mode */
1004 if (argc > 1 && (!strcmp(argv[1], "single") ||
1005 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
1006 /* Ask first then start a shell on tty2-4 */
1007 if (secondConsole != NULL)
1008 new_initAction(ASKFIRST, SHELL, secondConsole);
1009 if (thirdConsole != NULL)
1010 new_initAction(ASKFIRST, SHELL, thirdConsole);
1011 if (fourthConsole != NULL)
1012 new_initAction(ASKFIRST, SHELL, fourthConsole);
1013 /* Start a shell on tty1 */
1014 new_initAction(RESPAWN, SHELL, console);
1016 /* Not in single user mode -- see what inittab says */
1018 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
1019 * then parse_inittab() simply adds in some default
1020 * actions(i.e runs INIT_SCRIPT and then starts a pair
1021 * of "askfirst" shells */
1025 /* Fix up argv[0] to be certain we claim to be init */
1029 strncpy(argv[1], "\0", strlen(argv[1])+1);
1031 /* Now run everything that needs to be run */
1033 /* First run the sysinit command */
1034 for (a = initActionList; a; a = a->nextPtr) {
1035 if (a->action == SYSINIT) {
1036 waitfor(a->process, a->console, FALSE);
1037 /* Now remove the "sysinit" entry from the list */
1038 delete_initAction(a);
1041 /* Next run anything that wants to block */
1042 for (a = initActionList; a; a = a->nextPtr) {
1043 if (a->action == WAIT) {
1044 waitfor(a->process, a->console, FALSE);
1045 /* Now remove the "wait" entry from the list */
1046 delete_initAction(a);
1049 /* Next run anything to be run only once */
1050 for (a = initActionList; a; a = a->nextPtr) {
1051 if (a->action == ONCE) {
1052 run(a->process, a->console, FALSE);
1053 /* Now remove the "once" entry from the list */
1054 delete_initAction(a);
1057 /* If there is nothing else to do, stop */
1058 if (initActionList == NULL) {
1059 message(LOG | CONSOLE,
1060 "No more tasks for init -- sleeping forever.\n");
1065 /* Now run the looping stuff for the rest of forever */
1067 for (a = initActionList; a; a = a->nextPtr) {
1068 /* Only run stuff with pid==0. If they have
1069 * a pid, that means they are still running */
1071 switch (a->action) {
1073 /* run the respawn stuff */
1074 a->pid = run(a->process, a->console, FALSE);
1077 /* run the askfirst stuff */
1078 a->pid = run(a->process, a->console, TRUE);
1080 /* silence the compiler's incessant whining */
1086 /* Wait for a child process to exit */
1087 wpid = wait(&status);
1089 /* Find out who died and clean up their corpse */
1090 for (a = initActionList; a; a = a->nextPtr) {
1091 if (a->pid == wpid) {
1094 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1105 c-file-style: "linux"