1 /* vi: set sw=4 ts=4: */
3 * Mini init implementation for busybox
5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
6 * Copyright (C) 1999-2002 by Erik Andersen <andersee@debian.org>
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>
50 #if defined(__UCLIBC__) && !defined(__UCLIBC_HAS_MMU__)
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... */
81 #if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__)
82 #include <sys/reboot.h>
83 #define init_reboot(magic) reboot(magic)
85 #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
89 #define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
92 #if defined CONFIG_FEATURE_INIT_COREDUMPS
94 * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
95 * before processes are spawned to set core file size as unlimited.
96 * This is for debugging only. Don't use this is production, unless
97 * you want core dumps lying about....
99 #define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
100 #include <sys/resource.h>
101 #include <sys/time.h>
104 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
106 #if __GNU_LIBRARY__ > 5
107 #include <sys/kdaemon.h>
109 extern int bdflush (int func, long int data);
112 #define SHELL "/bin/sh" /* Default shell */
113 #define LOGIN_SHELL "-" SHELL /* Default login shell */
114 #define INITTAB "/etc/inittab" /* inittab file location */
116 #define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
119 #define MAXENV 16 /* Number of env. vars */
121 /* Allowed init action types */
122 #define SYSINIT 0x001
123 #define RESPAWN 0x002
124 #define ASKFIRST 0x004
127 #define CTRLALTDEL 0x020
128 #define SHUTDOWN 0x040
129 #define RESTART 0x080
131 /* A mapping between "inittab" action name strings and action type codes. */
132 struct init_action_type {
137 static const struct init_action_type actions[] = {
138 {"sysinit", SYSINIT},
139 {"respawn", RESPAWN},
140 {"askfirst", ASKFIRST},
143 {"ctrlaltdel", CTRLALTDEL},
144 {"shutdown", SHUTDOWN},
145 {"restart", RESTART},
149 /* Set up a linked list of init_actions, to be read from inittab */
154 struct init_action *next;
158 /* Static variables */
159 static struct init_action *init_action_list = NULL;
160 static char *secondConsole = VC_2;
161 static char *thirdConsole = VC_3;
162 static char *fourthConsole = VC_4;
163 static char *log = VC_5;
164 static int kernelVersion = 0;
165 static char termType[32] = "TERM=linux";
166 static char console[32] = _PATH_CONSOLE;
167 static sig_atomic_t got_cont = 0;
168 static const int LOG = 0x1;
169 static const int CONSOLE = 0x2;
170 #if defined CONFIG_FEATURE_EXTRA_QUIET
171 static const int MAYBE_CONSOLE = 0x0;
173 #define MAYBE_CONSOLE CONSOLE
175 #ifndef RB_HALT_SYSTEM
176 static const int RB_HALT_SYSTEM = 0xcdef0123;
177 static const int RB_ENABLE_CAD = 0x89abcdef;
178 static const int RB_DISABLE_CAD = 0;
179 #define RB_POWER_OFF 0x4321fedc
180 static const int RB_AUTOBOOT = 0x01234567;
183 /* Function prototypes */
184 static void delete_init_action(struct init_action *a);
185 static int waitfor(struct init_action *a);
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, ...) __attribute__ ((format (printf, 2, 3)));
202 static void message(int device, char *fmt, ...)
207 #ifdef CONFIG_SYSLOGD
209 /* Log the message to syslogd */
213 va_start(arguments, fmt);
214 vsnprintf(msg, sizeof(msg), fmt, arguments);
216 syslog_msg(LOG_USER, LOG_INFO, msg);
219 static int log_fd = -1;
221 /* Take full control of the log tty, and never close it.
222 * It's mine, all mine! Muhahahaha! */
225 /* don't even try to log, because there is no such console */
227 /* log to main console instead */
229 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
231 fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
236 if ((device & LOG) && (log_fd >= 0)) {
237 va_start(arguments, fmt);
238 vdprintf(log_fd, fmt, arguments);
243 if (device & CONSOLE) {
244 /* Always send console messages to /dev/console so people will see them. */
247 device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
248 va_start(arguments, fmt);
249 vdprintf(fd, fmt, arguments);
253 fprintf(stderr, "Bummer, can't print: ");
254 va_start(arguments, fmt);
255 vfprintf(stderr, fmt, arguments);
261 /* Set terminal settings to reasonable defaults */
262 static void set_term(int fd)
268 /* set control chars */
269 tty.c_cc[VINTR] = 3; /* C-c */
270 tty.c_cc[VQUIT] = 28; /* C-\ */
271 tty.c_cc[VERASE] = 127; /* C-? */
272 tty.c_cc[VKILL] = 21; /* C-u */
273 tty.c_cc[VEOF] = 4; /* C-d */
274 tty.c_cc[VSTART] = 17; /* C-q */
275 tty.c_cc[VSTOP] = 19; /* C-s */
276 tty.c_cc[VSUSP] = 26; /* C-z */
278 /* use line dicipline 0 */
281 /* Make it be sane */
282 tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
283 tty.c_cflag |= CREAD|HUPCL|CLOCAL;
287 tty.c_iflag = ICRNL | IXON | IXOFF;
290 tty.c_oflag = OPOST | ONLCR;
294 ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
296 tcsetattr(fd, TCSANOW, &tty);
299 /* How much memory does this machine have?
300 Units are kBytes to avoid overflow on 4GB machines */
301 static int check_free_memory(void)
304 unsigned int result, u, s=10;
306 if (sysinfo(&info) != 0) {
307 perror_msg("Error checking free memory");
311 /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
312 * Kernels 2.4.0 return info.mem_unit in bytes. */
315 while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
316 result = (info.totalram>>s) + (info.totalswap>>s);
318 if (result < 0) result = INT_MAX;
322 static void console_init(void)
325 int tried_devcons = 0;
326 int tried_vtprimary = 0;
328 struct serial_struct sr;
331 if ((s = getenv("TERM")) != NULL) {
332 snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
335 if ((s = getenv("CONSOLE")) != NULL) {
336 safe_strncpy(console, s, sizeof(console));
339 /* sparc kernel supports console=tty[ab] parameter which is also
340 * passed to init, so catch it here */
341 else if ((s = getenv("console")) != NULL) {
342 /* remap tty[ab] to /dev/ttyS[01] */
343 if (strcmp(s, "ttya") == 0)
344 safe_strncpy(console, SC_0, sizeof(console));
345 else if (strcmp(s, "ttyb") == 0)
346 safe_strncpy(console, SC_1, sizeof(console));
350 /* 2.2 kernels: identify the real console backend and try to use it */
351 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
352 /* this is a serial console */
353 snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
354 } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
355 /* this is linux virtual tty */
356 snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
358 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
363 while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
364 /* Can't open selected console -- try /dev/console */
365 if (!tried_devcons) {
367 safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
370 /* Can't open selected console -- try vt1 */
371 if (!tried_vtprimary) {
373 safe_strncpy(console, VC_1, sizeof(console));
379 /* Perhaps we should panic here? */
380 safe_strncpy(console, "/dev/null", sizeof(console));
382 /* check for serial console and disable logging to tty5 &
383 * running a shell to tty2-4 */
384 if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
386 secondConsole = NULL;
388 fourthConsole = NULL;
389 /* Force the TERM setting to vt102 for serial console --
390 * iff TERM is set to linux (the default) */
391 if (strcmp( termType, "TERM=linux" ) == 0)
392 safe_strncpy(termType, "TERM=vt102", sizeof(termType));
393 message(LOG | CONSOLE,
394 "\rserial console detected. Disabling virtual terminals.\n");
398 message(LOG, "console=%s\n", console);
401 static void fixup_argv(int argc, char **argv, char *new_argv0)
404 /* Fix up argv[0] to be certain we claim to be init */
405 len = strlen(argv[0]);
406 memset(argv[0], 0, len);
407 safe_strncpy(argv[0], new_argv0, len + 1);
409 /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
412 memset(argv[len], 0, strlen(argv[len]));
417 /* Make sure there is enough memory to do something useful. *
418 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
419 static void check_memory(void)
423 if (check_free_memory() > 1000)
426 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
427 if (stat("/etc/fstab", &statBuf) == 0) {
428 /* swapon -a requires /proc typically */
429 system("/bin/mount -t proc proc /proc");
430 /* Try to turn on swap */
431 system("/sbin/swapon -a");
432 if (check_free_memory() < 1000)
441 "\rSorry, your computer does not have enough memory.\n");
445 static pid_t run(struct init_action *a)
449 pid_t pid, pgrp, tmp_pid;
450 char *s, *tmpCmd, *cmd[255], *cmdpath, buf[255];
451 sigset_t nmask, omask;
452 char *environment[MAXENV+1] = {
455 "PATH=" _PATH_STDPATH,
460 static const char press_enter[] =
461 #ifdef CUSTOMIZED_BANNER
462 #include CUSTOMIZED_BANNER
464 "\nPlease press Enter to activate this console. ";
466 /* inherit environment to the child, merging our values -andy */
467 for (i=0; environ[i]; i++) {
468 for (j=0; environment[j]; j++) {
469 s = strchr(environment[j], '=');
470 if (!strncmp(environ[i], environment[j], s - environment[j]))
473 if (!environment[j]) {
474 environment[j++] = environ[i];
475 environment[j] = NULL;
479 /* Block sigchild while forking. */
481 sigaddset(&nmask, SIGCHLD);
482 sigprocmask(SIG_BLOCK, &nmask, &omask);
484 if ((pid = fork()) == 0)
487 ioctl(0, TIOCNOTTY, 0);
491 sigprocmask(SIG_SETMASK, &omask, NULL);
493 /* Create a new session and make ourself the process group leader */
496 /* Reset signal handlers that were set by the parent process */
497 signal(SIGUSR1, SIG_DFL);
498 signal(SIGUSR2, SIG_DFL);
499 signal(SIGINT, SIG_DFL);
500 signal(SIGTERM, SIG_DFL);
501 signal(SIGHUP, SIG_DFL);
502 signal(SIGCONT, SIG_DFL);
503 signal(SIGSTOP, SIG_DFL);
504 signal(SIGTSTP, SIG_DFL);
506 /* Open the new terminal device */
507 if ((fd = device_open(a->terminal, O_RDWR|O_NOCTTY)) < 0) {
508 if (stat(a->terminal, &sb) != 0) {
509 message(LOG | CONSOLE, "\rdevice '%s' does not exist.\n",
513 message(LOG | CONSOLE, "\rBummer, can't open %s\n", a->terminal);
516 /* Make sure the terminal will act fairly normal for us */
519 /* If the init Action requires up to wait, then force the
520 * supplied terminal to be the controlling tty. */
521 if (a->action & (SYSINIT|WAIT|CTRLALTDEL|SHUTDOWN|RESTART|ASKFIRST)) {
523 /* Take over the controlling tty */
524 ioctl(fd, TIOCSCTTY, 1);
525 /* Setup stdin, stdout, stderr for the new process so
526 * they point to the supplied terminal */
530 /* Now fork off another process to just hang around */
531 if ((pid = fork()) < 0) {
532 message(LOG | CONSOLE, "Can't fork!\n");
538 /* We are the parent -- wait till the child is done */
539 signal(SIGINT, SIG_IGN);
540 signal(SIGTSTP, SIG_IGN);
541 signal(SIGQUIT, SIG_IGN);
542 signal(SIGCHLD, SIG_DFL);
544 /* Wait for child to exit */
545 while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
546 if (tmp_pid < 0 && errno == ECHILD)
550 /* See if stealing the controlling tty back is necessary */
551 pgrp = tcgetpgrp(tmp_pid);
552 if (pgrp != getpid())
555 /* Use a temporary process to steal the controlling tty. */
556 if ((pid = fork()) < 0) {
557 message(LOG | CONSOLE, "\rCan't fork!\n");
562 ioctl(tmp_pid, TIOCSCTTY, 1);
565 while((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
566 if (tmp_pid < 0 && errno == ECHILD)
572 /* Now fall though to actually execute things */
578 /* See if any special /bin/sh requiring characters are present */
579 if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
582 strcpy(buf, "exec ");
583 safe_strncpy(buf + sizeof("exec "), a->command,
584 sizeof(buf) - sizeof("exec "));
588 /* Convert command (char*) into cmd (char**, one word per string) */
589 safe_strncpy(buf, a->command, sizeof(buf));
591 for (tmpCmd = buf, i = 0;
592 (tmpCmd = strsep(&s, " \t")) != NULL;) {
593 if (*tmpCmd != '\0') {
605 Interactive shells want to see a dash in argv[0]. This
606 typically is handled by login, argv will be setup this
607 way if a dash appears at the front of the command path
611 if (*cmdpath == '-') {
613 /* skip over the dash */
616 /* find the last component in the command pathname */
617 s = get_last_path_component(cmdpath);
619 /* make a new argv[0] */
620 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
621 message(LOG | CONSOLE, "malloc failed");
629 if (a->action & ASKFIRST) {
631 * Save memory by not exec-ing anything large (like a shell)
632 * before the user wants it. This is critical if swap is not
633 * enabled and the system has low memory. Generally this will
634 * be run on the second virtual console, and the first will
635 * be allowed to start a shell or whatever an init script
638 messageND(LOG, "Waiting for enter to start '%s' (pid %d, terminal %s)\n",
639 cmdpath, getpid(), a->terminal);
640 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
644 /* Log the process name and args */
645 messageND(LOG, "Starting pid %d, console %s: '%s'\n",
646 getpid(), a->terminal, cmdpath);
648 #if defined CONFIG_FEATURE_INIT_COREDUMPS
649 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
651 limit.rlim_cur = RLIM_INFINITY;
652 limit.rlim_max = RLIM_INFINITY;
653 setrlimit(RLIMIT_CORE, &limit);
657 /* Now run it. The new program will take over this PID,
658 * so nothing further in init.c should be run. */
659 execve(cmdpath, cmd, environment);
661 /* We're still here? Some error happened. */
662 message(LOG | CONSOLE, "\rBummer, could not run '%s': %s\n", cmdpath,
666 sigprocmask(SIG_SETMASK, &omask, NULL);
670 static int waitfor(struct init_action *a)
677 wpid = wait(&status);
678 if (wpid > 0 && wpid != pid) {
687 /* Run all commands of a particular type */
688 static void run_actions(int action)
690 struct init_action *a, *tmp;
692 for (a = init_action_list; a; a = tmp) {
694 if (a->action == action) {
695 if (a->action & (SYSINIT|WAIT|CTRLALTDEL|SHUTDOWN|RESTART)) {
697 delete_init_action(a);
698 } else if (a->action & ONCE) {
700 delete_init_action(a);
701 } else if (a->action & (RESPAWN|ASKFIRST)) {
702 /* Only run stuff with pid==0. If they have
703 * a pid, that means it is still running */
714 static void shutdown_system(void)
716 sigset_t block_signals;
718 /* first disable all our signals */
719 sigemptyset(&block_signals);
720 sigaddset(&block_signals, SIGHUP);
721 sigaddset(&block_signals, SIGCHLD);
722 sigaddset(&block_signals, SIGUSR1);
723 sigaddset(&block_signals, SIGUSR2);
724 sigaddset(&block_signals, SIGINT);
725 sigaddset(&block_signals, SIGTERM);
726 sigaddset(&block_signals, SIGCONT);
727 sigaddset(&block_signals, SIGSTOP);
728 sigaddset(&block_signals, SIGTSTP);
729 sigprocmask(SIG_BLOCK, &block_signals, NULL);
731 /* Allow Ctrl-Alt-Del to reboot system. */
732 init_reboot(RB_ENABLE_CAD);
734 message(CONSOLE|LOG, "\n\rThe system is going down NOW !!\n");
737 /* Send signals to every process _except_ pid 1 */
738 message(CONSOLE|LOG, "\rSending SIGTERM to all processes.\n");
743 message(CONSOLE|LOG, "\rSending SIGKILL to all processes.\n");
747 /* run everything to be run at "shutdown" */
748 run_actions(SHUTDOWN);
751 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
752 /* bdflush, kupdate not needed for kernels >2.2.11 */
758 static void exec_signal(int sig)
760 struct init_action *a, *tmp;
761 for (a = init_action_list; a; a = tmp) {
763 if (a->action & RESTART) {
765 message(CONSOLE|LOG, "\rTrying to re-exec %s\n", a->command);
766 execl(a->command, a->command, NULL);
768 message(CONSOLE|LOG, "\rexec of '%s' failed: %s\n",
769 a->command, sys_errlist[errno]);
772 init_reboot(RB_HALT_SYSTEM);
778 static void halt_signal(int sig)
783 /* Seems the s390 console is Wierd(tm). */
784 "\rThe system is halted. You may reboot now.\n"
786 /* secondConsole is NULL for a serial console */
787 "\rThe system is halted. Press %s or turn off power\n",
788 (secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
793 /* allow time for last message to reach serial console */
796 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
797 init_reboot(RB_POWER_OFF);
799 init_reboot(RB_HALT_SYSTEM);
804 static void reboot_signal(int sig)
807 message(CONSOLE|LOG, "\rPlease stand by while rebooting the system.\n");
810 /* allow time for last message to reach serial console */
813 init_reboot(RB_AUTOBOOT);
818 static void ctrlaltdel_signal(int sig)
820 run_actions(CTRLALTDEL);
823 /* The SIGSTOP & SIGTSTP handler */
824 static void stop_handler(int sig)
826 int saved_errno = errno;
829 while(!got_cont) pause();
834 /* The SIGCONT handler */
835 static void cont_handler(int sig)
840 #endif /* ! DEBUG_INIT */
842 static void new_init_action(int action, char *command, char *cons)
844 struct init_action *new_action, *a;
849 /* If BusyBox detects that a serial console is in use, then entries
850 * not refering to the console or null devices will _not_ be run.
851 * The exception to this rule is the null device.
853 if (secondConsole == NULL && strcmp(cons, console)
854 && strcmp(cons, "/dev/null"))
856 if (strcmp(cons, "/dev/null") == 0 && (action & ASKFIRST))
859 new_action = calloc((size_t) (1), sizeof(struct init_action));
861 message(LOG | CONSOLE, "\rMemory allocation failure\n");
865 /* Append to the end of the list */
866 for (a = init_action_list; a && a->next; a = a->next) ;
868 a->next = new_action;
870 init_action_list = new_action;
872 safe_strncpy(new_action->command, command, 255);
873 new_action->action = action;
874 safe_strncpy(new_action->terminal, cons, 255);
876 // message(LOG|CONSOLE, "command='%s' action='%d' terminal='%s'\n",
877 // new_action->command, new_action->action, new_action->terminal);
880 static void delete_init_action(struct init_action * action)
882 struct init_action *a, *b = NULL;
884 for (a = init_action_list; a; b = a, a = a->next) {
887 init_action_list = a->next;
897 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
898 * then parse_inittab() simply adds in some default
899 * actions(i.e., runs INIT_SCRIPT and then starts a pair
900 * of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
901 * _is_ defined, but /etc/inittab is missing, this
902 * results in the same set of default behaviors.
904 static void parse_inittab(void)
906 #ifdef CONFIG_FEATURE_USE_INITTAB
908 char buf[256], lineAsRead[256], tmpConsole[256];
909 char *id, *runlev, *action, *command, *eol;
910 const struct init_action_type *a = actions;
914 file = fopen(INITTAB, "r");
916 /* No inittab file -- set up some default behavior */
918 /* Reboot on Ctrl-Alt-Del */
919 new_init_action(CTRLALTDEL, "/sbin/reboot", console);
920 /* Umount all filesystems on halt/reboot */
921 new_init_action(SHUTDOWN, "/bin/umount -a -r", console);
922 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
923 /* Swapoff on halt/reboot */
924 new_init_action(SHUTDOWN, "/sbin/swapoff -a", console);
926 /* Prepare to restart init when a HUP is received */
927 new_init_action(RESTART, "/sbin/init", console);
928 /* Askfirst shell on tty1 */
929 new_init_action(ASKFIRST, LOGIN_SHELL, console);
930 /* Askfirst shell on tty2 */
931 if (secondConsole != NULL)
932 new_init_action(ASKFIRST, LOGIN_SHELL, secondConsole);
933 /* Askfirst shell on tty3 */
934 if (thirdConsole != NULL)
935 new_init_action(ASKFIRST, LOGIN_SHELL, thirdConsole);
936 /* Askfirst shell on tty4 */
937 if (fourthConsole != NULL)
938 new_init_action(ASKFIRST, LOGIN_SHELL, fourthConsole);
940 new_init_action(SYSINIT, INIT_SCRIPT, console);
943 #ifdef CONFIG_FEATURE_USE_INITTAB
946 while (fgets(buf, 255, file) != NULL) {
948 /* Skip leading spaces */
949 for (id = buf; *id == ' ' || *id == '\t'; id++);
951 /* Skip the line if it's a comment */
952 if (*id == '#' || *id == '\n')
955 /* Trim the trailing \n */
956 eol = strrchr(id, '\n');
960 /* Keep a copy around for posterity's sake (and error msgs) */
961 strcpy(lineAsRead, buf);
963 /* Separate the ID field from the runlevels */
964 runlev = strchr(id, ':');
965 if (runlev == NULL || *(runlev + 1) == '\0') {
966 message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
973 /* Separate the runlevels from the action */
974 action = strchr(runlev, ':');
975 if (action == NULL || *(action + 1) == '\0') {
976 message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
983 /* Separate the action from the command */
984 command = strchr(action, ':');
985 if (command == NULL || *(command + 1) == '\0') {
986 message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
993 /* Ok, now process it */
995 while (a->name != 0) {
996 if (strcmp(a->name, action) == 0) {
998 strcpy(tmpConsole, "/dev/");
999 strncat(tmpConsole, id, 200);
1002 new_init_action(a->action, command, id);
1007 if (foundIt == TRUE)
1010 /* Choke on an unknown action */
1011 message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
1016 #endif /* CONFIG_FEATURE_USE_INITTAB */
1021 extern int init_main(int argc, char **argv)
1023 struct init_action *a;
1027 if (argc > 1 && !strcmp(argv[1], "-q")) {
1028 /* don't assume init's pid == 1 */
1029 long *pid = find_pid_by_name("init");
1030 if (!pid || *pid<=0) {
1031 pid = find_pid_by_name("linuxrc");
1032 if (!pid || *pid<=0)
1033 error_msg_and_die("no process killed");
1040 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
1042 #ifdef CONFIG_FEATURE_INITRD
1043 && strstr(applet_name, "linuxrc") == NULL
1049 /* Set up sig handlers -- be sure to
1050 * clear all of these in run() */
1051 signal(SIGHUP, exec_signal);
1052 signal(SIGUSR1, halt_signal);
1053 signal(SIGUSR2, halt_signal);
1054 signal(SIGINT, ctrlaltdel_signal);
1055 signal(SIGTERM, reboot_signal);
1056 signal(SIGCONT, cont_handler);
1057 signal(SIGSTOP, stop_handler);
1058 signal(SIGTSTP, stop_handler);
1060 /* Turn off rebooting via CTL-ALT-DEL -- we get a
1061 * SIGINT on CAD so we can shut things down gracefully... */
1062 init_reboot(RB_DISABLE_CAD);
1065 /* Figure out what kernel this is running */
1066 kernelVersion = get_kernel_revision();
1068 /* Close whatever files are open, and reset the console. */
1073 /* Figure out where the default console should be */
1080 /* Make sure PATH is set to something sane */
1081 putenv("PATH="_PATH_STDPATH);
1084 message(MAYBE_CONSOLE|LOG, "\rinit started: %s\n", full_version);
1086 /* Make sure there is enough memory to do something useful. */
1089 /* Check if we are supposed to be in single user mode */
1090 if (argc > 1 && (!strcmp(argv[1], "single") ||
1091 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
1092 /* Ask first then start a shell on tty2-4 */
1093 if (secondConsole != NULL)
1094 new_init_action(ASKFIRST, LOGIN_SHELL, secondConsole);
1095 if (thirdConsole != NULL)
1096 new_init_action(ASKFIRST, LOGIN_SHELL, thirdConsole);
1097 if (fourthConsole != NULL)
1098 new_init_action(ASKFIRST, LOGIN_SHELL, fourthConsole);
1099 /* Start a shell on tty1 */
1100 new_init_action(RESPAWN, LOGIN_SHELL, console);
1102 /* Not in single user mode -- see what inittab says */
1104 /* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
1105 * then parse_inittab() simply adds in some default
1106 * actions(i.e., runs INIT_SCRIPT and then starts a pair
1107 * of "askfirst" shells */
1111 /* Make the command line just say "init" -- thats all, nothing else */
1112 fixup_argv(argc, argv, "init");
1114 /* Now run everything that needs to be run */
1116 /* First run the sysinit command */
1117 run_actions(SYSINIT);
1119 /* Next run anything that wants to block */
1122 /* Next run anything to be run only once */
1125 /* If there is nothing else to do, stop */
1126 if (init_action_list == NULL) {
1127 message(LOG | CONSOLE, "\rNo more tasks for init -- sleeping forever.\n");
1131 /* Now run the looping stuff for the rest of forever */
1133 /* run the respawn stuff */
1134 run_actions(RESPAWN);
1136 /* run the askfirst stuff */
1137 run_actions(ASKFIRST);
1139 /* Don't consume all CPU time -- sleep a bit */
1142 /* Wait for a child process to exit */
1143 wpid = wait(&status);
1145 /* Find out who died and clean up their corpse */
1146 for (a = init_action_list; a; a = a->next) {
1147 if (a->pid == wpid) {
1148 /* Set the pid to 0 so that the process gets
1149 * restarted by run_actions() */
1151 message(LOG, "Process '%s' (pid %d) exited. "
1152 "Scheduling it for restart.\n", a->command, wpid);
1161 c-file-style: "linux"