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(applet_name, 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);
229 if ((device & LOG) && (log_fd >= 0)) {
230 va_start(arguments, fmt);
231 vdprintf(log_fd, fmt, arguments);
236 if (device & CONSOLE) {
237 /* Always send console messages to /dev/console so people will see them. */
240 device_open(_PATH_CONSOLE,
241 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
242 va_start(arguments, fmt);
243 vdprintf(fd, fmt, arguments);
247 fprintf(stderr, "Bummer, can't print: ");
248 va_start(arguments, fmt);
249 vfprintf(stderr, fmt, arguments);
255 /* Set terminal settings to reasonable defaults */
256 void set_term(int fd)
262 /* set control chars */
263 tty.c_cc[VINTR] = 3; /* C-c */
264 tty.c_cc[VQUIT] = 28; /* C-\ */
265 tty.c_cc[VERASE] = 127; /* C-? */
266 tty.c_cc[VKILL] = 21; /* C-u */
267 tty.c_cc[VEOF] = 4; /* C-d */
268 tty.c_cc[VSTART] = 17; /* C-q */
269 tty.c_cc[VSTOP] = 19; /* C-s */
270 tty.c_cc[VSUSP] = 26; /* C-z */
272 /* use line dicipline 0 */
275 /* Make it be sane */
276 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
277 tty.c_cflag |= HUPCL|CLOCAL;
280 tty.c_iflag = ICRNL | IXON | IXOFF;
283 tty.c_oflag = OPOST | ONLCR;
287 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
289 tcsetattr(fd, TCSANOW, &tty);
292 /* How much memory does this machine have?
293 Units are kBytes to avoid overflow on 4GB machines */
294 static int check_free_memory()
297 unsigned int result, u, s=10;
299 if (sysinfo(&info) != 0) {
300 perror_msg("Error checking free memory");
304 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
305 * Kernels 2.4.0 return info.mem_unit in bytes. */
308 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
309 result = (info.totalram>>s) + (info.totalswap>>s);
311 if (result < 0) result = INT_MAX;
315 static void console_init()
318 int tried_devcons = 0;
319 int tried_vtprimary = 0;
321 struct serial_struct sr;
324 if ((s = getenv("TERM")) != NULL) {
325 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
328 if ((s = getenv("CONSOLE")) != NULL) {
329 snprintf(console, sizeof(console) - 1, "%s", s);
332 /* sparc kernel supports console=tty[ab] parameter which is also
333 * passed to init, so catch it here */
334 else if ((s = getenv("console")) != NULL) {
335 /* remap tty[ab] to /dev/ttyS[01] */
336 if (strcmp(s, "ttya") == 0)
337 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
338 else if (strcmp(s, "ttyb") == 0)
339 snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
343 /* 2.2 kernels: identify the real console backend and try to use it */
344 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
345 /* this is a serial console */
346 snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
347 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
348 /* this is linux virtual tty */
349 snprintf(console, sizeof(console) - 1, "/dev/tty%d",
352 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
357 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
358 /* Can't open selected console -- try /dev/console */
359 if (!tried_devcons) {
361 snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
364 /* Can't open selected console -- try vt1 */
365 if (!tried_vtprimary) {
367 snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
373 /* Perhaps we should panic here? */
374 snprintf(console, sizeof(console) - 1, "/dev/null");
376 /* check for serial console and disable logging to tty5 & running a
378 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
380 secondConsole = NULL;
382 fourthConsole = NULL;
383 /* Force the TERM setting to vt102 for serial console --
384 * iff TERM is set to linux (the default) */
385 if (strcmp( termType, "TERM=linux" ) == 0)
386 snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
387 message(LOG | CONSOLE,
388 "serial console detected. Disabling virtual terminals.\r\n");
392 message(LOG, "console=%s\n", console);
395 static pid_t run(char *command, char *terminal, int get_enter)
400 char *cmd[255], *cmdpath;
402 static const char press_enter[] =
404 #ifdef CUSTOMIZED_BANNER
405 #include CUSTOMIZED_BANNER
408 "\nPlease press Enter to activate this console. ";
409 char *environment[] = {
411 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
418 if ((pid = fork()) == 0) {
420 ioctl(0, TIOCNOTTY, 0);
426 /* Reset signal handlers set for parent process */
427 signal(SIGUSR1, SIG_DFL);
428 signal(SIGUSR2, SIG_DFL);
429 signal(SIGINT, SIG_DFL);
430 signal(SIGTERM, SIG_DFL);
431 signal(SIGHUP, SIG_DFL);
433 if ((fd = device_open(terminal, O_RDWR)) < 0) {
434 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
440 ioctl(0, TIOCSCTTY, 1);
441 tcsetpgrp(0, getpgrp());
444 if (get_enter == TRUE) {
446 * Save memory by not exec-ing anything large (like a shell)
447 * before the user wants it. This is critical if swap is not
448 * enabled and the system has low memory. Generally this will
449 * be run on the second virtual console, and the first will
450 * be allowed to start a shell or whatever an init script
454 pid_t shell_pgid = getpid();
455 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
456 command, shell_pgid, terminal);
458 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
463 /* Log the process name and args */
464 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
465 shell_pgid, terminal, command);
468 /* See if any special /bin/sh requiring characters are present */
469 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
472 strcpy(buf, "exec ");
473 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
477 /* Convert command (char*) into cmd (char**, one word per string) */
478 for (tmpCmd = command, i = 0;
479 (tmpCmd = strsep(&command, " \t")) != NULL;) {
480 if (*tmpCmd != '\0') {
492 Interactive shells want to see a dash in argv[0]. This
493 typically is handled by login, argv will be setup this
494 way if a dash appears at the front of the command path
498 if (*cmdpath == '-') {
501 /* skip over the dash */
504 /* find the last component in the command pathname */
505 s = get_last_path_component(cmdpath);
507 /* make a new argv[0] */
508 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
509 message(LOG | CONSOLE, "malloc failed");
517 #if defined BB_FEATURE_INIT_COREDUMPS
520 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
522 limit.rlim_cur = RLIM_INFINITY;
523 limit.rlim_max = RLIM_INFINITY;
524 setrlimit(RLIMIT_CORE, &limit);
529 /* Now run it. The new program will take over this PID,
530 * so nothing further in init.c should be run. */
531 execve(cmdpath, cmd, environment);
533 /* We're still here? Some error happened. */
534 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
541 static int waitfor(char *command, char *terminal, int get_enter)
544 int pid = run(command, terminal, get_enter);
547 wpid = wait(&status);
548 if (wpid > 0 && wpid != pid) {
557 /* Make sure there is enough memory to do something useful. *
558 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
559 static void check_memory()
563 if (check_free_memory() > 1000)
566 if (stat("/etc/fstab", &statBuf) == 0) {
567 /* swapon -a requires /proc typically */
568 waitfor("mount proc /proc -t proc", console, FALSE);
569 /* Try to turn on swap */
570 waitfor("swapon -a", console, FALSE);
571 if (check_free_memory() < 1000)
579 "Sorry, your computer does not have enough memory.\r\n");
584 /* Run all commands to be run right before halt/reboot */
585 static void run_lastAction(void)
588 for (a = initActionList; a; a = a->nextPtr) {
589 if (a->action == CTRLALTDEL) {
590 waitfor(a->process, a->console, FALSE);
591 delete_initAction(a);
598 static void shutdown_system(void)
601 /* first disable our SIGHUP signal */
602 signal(SIGHUP, SIG_DFL);
604 /* Allow Ctrl-Alt-Del to reboot system. */
605 init_reboot(RB_ENABLE_CAD);
607 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
610 /* Send signals to every process _except_ pid 1 */
611 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
616 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
620 /* run everything to be run at "ctrlaltdel" */
624 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
625 /* bdflush, kupdate not needed for kernels >2.2.11 */
631 static void halt_signal(int sig)
635 "The system is halted. Press %s or turn off power\r\n",
636 (secondConsole == NULL) /* serial console */
637 ? "Reset" : "CTRL-ALT-DEL");
640 /* allow time for last message to reach serial console */
643 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
644 init_reboot(RB_POWER_OFF);
646 init_reboot(RB_HALT_SYSTEM);
650 static void reboot_signal(int sig)
653 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
656 /* allow time for last message to reach serial console */
659 init_reboot(RB_AUTOBOOT);
663 #if defined BB_FEATURE_INIT_CHROOT
665 #warning BB_FEATURE_INIT_CHROOT is out of date and should be rewritten to us
666 #warning pivot root instead. Do not even bother till this work is done...
667 #warning You have been warned.
669 static void check_chroot(int sig)
671 char *argv_init[2] = { "init", NULL, };
672 char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
673 char rootpath[256], *tc;
676 if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
678 "SIGHUP recived, but could not open proc file\r\n");
682 if (read(fd, rootpath, sizeof(rootpath)) == -1) {
684 "SIGHUP recived, but could not read proc file\r\n");
690 if (rootpath[0] == '\0') {
692 "SIGHUP recived, but new root is not valid: %s\r\n",
698 tc = strrchr(rootpath, '\n');
701 /* Ok, making it this far means we commit */
702 message(CONSOLE, "Please stand by, changing root to `%s'.\r\n",
705 /* kill all other programs first */
706 message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
711 message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
716 /* ok, we don't need /proc anymore. we also assume that the signaling
717 * process left the rest of the filesystems alone for us */
720 /* Ok, now we chroot. Hopefully we only have two things mounted, the
721 * new chroot'd mount point, and the old "/" mount. s,
722 * we go ahead and unmount the old "/". This should trigger the kernel
723 * to set things up the Right Way(tm). */
725 if (!chroot(rootpath))
728 /* If the chroot fails, we are already too far to turn back, so we
729 * continue and hope that executing init below will revive the system */
731 /* close all of our descriptors and open new ones */
735 open("/dev/console", O_RDWR, 0);
739 message(CONSOLE, "Executing real init...\r\n");
740 /* execute init in the (hopefully) new root */
741 execve("/sbin/init", argv_init, envp_init);
744 "ERROR: Could not exec new init. Press %s to reboot.\r\n",
745 (secondConsole == NULL) /* serial console */
746 ? "Reset" : "CTRL-ALT-DEL");
749 #endif /* BB_FEATURE_INIT_CHROOT */
751 #endif /* ! DEBUG_INIT */
753 void new_initAction(initActionEnum action, char *process, char *cons)
755 initAction *newAction;
760 /* If BusyBox detects that a serial console is in use,
761 * then entries not refering to the console or null devices will _not_ be run.
762 * The exception to this rule is the null device.
764 if (secondConsole == NULL && strcmp(cons, console)
765 && strcmp(cons, "/dev/null"))
768 newAction = calloc((size_t) (1), sizeof(initAction));
770 message(LOG | CONSOLE, "Memory allocation failure\n");
774 newAction->nextPtr = initActionList;
775 initActionList = newAction;
776 strncpy(newAction->process, process, 255);
777 newAction->action = action;
778 strncpy(newAction->console, cons, 255);
780 // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
781 // newAction->process, newAction->action, newAction->console);
784 static void delete_initAction(initAction * action)
786 initAction *a, *b = NULL;
788 for (a = initActionList; a; b = a, a = a->nextPtr) {
791 initActionList = a->nextPtr;
793 b->nextPtr = a->nextPtr;
801 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
802 * then parse_inittab() simply adds in some default
803 * actions(i.e runs INIT_SCRIPT and then starts a pair
804 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
805 * _is_ defined, but /etc/inittab is missing, this
806 * results in the same set of default behaviors.
808 void parse_inittab(void)
810 #ifdef BB_FEATURE_USE_INITTAB
812 char buf[256], lineAsRead[256], tmpConsole[256];
813 char *id, *runlev, *action, *process, *eol;
814 const struct initActionType *a = actions;
818 file = fopen(INITTAB, "r");
820 /* No inittab file -- set up some default behavior */
822 /* Swapoff on halt/reboot */
823 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
824 /* Umount all filesystems on halt/reboot */
825 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
826 /* Askfirst shell on tty1 */
827 new_initAction(ASKFIRST, SHELL, console);
828 /* Askfirst shell on tty2 */
829 if (secondConsole != NULL)
830 new_initAction(ASKFIRST, SHELL, secondConsole);
831 /* Askfirst shell on tty3 */
832 if (thirdConsole != NULL)
833 new_initAction(ASKFIRST, SHELL, thirdConsole);
834 /* Askfirst shell on tty4 */
835 if (fourthConsole != NULL)
836 new_initAction(ASKFIRST, SHELL, fourthConsole);
838 new_initAction(SYSINIT, INIT_SCRIPT, console);
841 #ifdef BB_FEATURE_USE_INITTAB
844 while (fgets(buf, 255, file) != NULL) {
846 /* Skip leading spaces */
847 for (id = buf; *id == ' ' || *id == '\t'; id++);
849 /* Skip the line if it's a comment */
850 if (*id == '#' || *id == '\n')
853 /* Trim the trailing \n */
854 eol = strrchr(id, '\n');
858 /* Keep a copy around for posterity's sake (and error msgs) */
859 strcpy(lineAsRead, buf);
861 /* Separate the ID field from the runlevels */
862 runlev = strchr(id, ':');
863 if (runlev == NULL || *(runlev + 1) == '\0') {
864 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
871 /* Separate the runlevels from the action */
872 action = strchr(runlev, ':');
873 if (action == NULL || *(action + 1) == '\0') {
874 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
881 /* Separate the action from the process */
882 process = strchr(action, ':');
883 if (process == NULL || *(process + 1) == '\0') {
884 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
891 /* Ok, now process it */
893 while (a->name != 0) {
894 if (strcmp(a->name, action) == 0) {
898 strcpy(tmpConsole, "/dev/");
899 strncat(tmpConsole, id, 200);
900 if (stat(tmpConsole, &statBuf) != 0) {
901 message(LOG | CONSOLE,
902 "device '%s' does not exist. Did you read the directions?\n",
908 new_initAction(a->action, process, id);
916 /* Choke on an unknown action */
917 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
921 #endif /* BB_FEATURE_USE_INITTAB */
926 extern int init_main(int argc, char **argv)
933 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
935 #ifdef BB_FEATURE_LINUXRC
936 && strstr(applet_name, "linuxrc") == NULL
942 /* Set up sig handlers -- be sure to
943 * clear all of these in run() */
944 signal(SIGUSR1, halt_signal);
945 signal(SIGUSR2, halt_signal);
946 signal(SIGINT, reboot_signal);
947 signal(SIGTERM, reboot_signal);
948 #if defined BB_FEATURE_INIT_CHROOT
949 signal(SIGHUP, check_chroot);
952 /* Turn off rebooting via CTL-ALT-DEL -- we get a
953 * SIGINT on CAD so we can shut things down gracefully... */
954 init_reboot(RB_DISABLE_CAD);
957 /* Figure out what kernel this is running */
958 kernelVersion = get_kernel_revision();
960 /* Figure out where the default console should be */
963 /* Close whatever files are open, and reset the console. */
971 /* Make sure PATH is set to something sane */
972 putenv(_PATH_STDPATH);
977 #if ! defined BB_FEATURE_EXTRA_QUIET
981 "init started: %s\r\n", full_version);
984 #if ! defined BB_FEATURE_EXTRA_QUIET
988 "init(%d) started: %s\r\n", getpid(), full_version);
992 /* Make sure there is enough memory to do something useful. */
995 /* Check if we are supposed to be in single user mode */
996 if (argc > 1 && (!strcmp(argv[1], "single") ||
997 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
998 /* Ask first then start a shell on tty2-4 */
999 if (secondConsole != NULL)
1000 new_initAction(ASKFIRST, SHELL, secondConsole);
1001 if (thirdConsole != NULL)
1002 new_initAction(ASKFIRST, SHELL, thirdConsole);
1003 if (fourthConsole != NULL)
1004 new_initAction(ASKFIRST, SHELL, fourthConsole);
1005 /* Start a shell on tty1 */
1006 new_initAction(RESPAWN, SHELL, console);
1008 /* Not in single user mode -- see what inittab says */
1010 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
1011 * then parse_inittab() simply adds in some default
1012 * actions(i.e runs INIT_SCRIPT and then starts a pair
1013 * of "askfirst" shells */
1017 /* Fix up argv[0] to be certain we claim to be init */
1023 /* Now run everything that needs to be run */
1025 /* First run the sysinit command */
1026 for (a = initActionList; a; a = a->nextPtr) {
1027 if (a->action == SYSINIT) {
1028 waitfor(a->process, a->console, FALSE);
1029 /* Now remove the "sysinit" entry from the list */
1030 delete_initAction(a);
1033 /* Next run anything that wants to block */
1034 for (a = initActionList; a; a = a->nextPtr) {
1035 if (a->action == WAIT) {
1036 waitfor(a->process, a->console, FALSE);
1037 /* Now remove the "wait" entry from the list */
1038 delete_initAction(a);
1041 /* Next run anything to be run only once */
1042 for (a = initActionList; a; a = a->nextPtr) {
1043 if (a->action == ONCE) {
1044 run(a->process, a->console, FALSE);
1045 /* Now remove the "once" entry from the list */
1046 delete_initAction(a);
1049 /* If there is nothing else to do, stop */
1050 if (initActionList == NULL) {
1051 message(LOG | CONSOLE,
1052 "No more tasks for init -- sleeping forever.\n");
1057 /* Now run the looping stuff for the rest of forever */
1059 for (a = initActionList; a; a = a->nextPtr) {
1060 /* Only run stuff with pid==0. If they have
1061 * a pid, that means they are still running */
1063 switch (a->action) {
1065 /* run the respawn stuff */
1066 a->pid = run(a->process, a->console, FALSE);
1069 /* run the askfirst stuff */
1070 a->pid = run(a->process, a->console, TRUE);
1072 /* silence the compiler's incessant whining */
1078 /* Wait for a child process to exit */
1079 wpid = wait(&status);
1081 /* Find out who died and clean up their corpse */
1082 for (a = initActionList; a; a = a->nextPtr) {
1083 if (a->pid == wpid) {
1086 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1097 c-file-style: "linux"