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 #define bb_need_full_version
47 #define BB_DECLARE_EXTERN
50 # include <sys/syslog.h>
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 #define MAXENV 16 /* Number of env. vars */
138 //static const int MAXENV = 16; /* Number of env. vars */
139 static const int LOG = 0x1;
140 static const int CONSOLE = 0x2;
142 /* Allowed init action types */
152 /* A mapping between "inittab" action name strings and action type codes. */
153 typedef struct initActionType {
155 initActionEnum action;
158 static const struct initActionType actions[] = {
159 {"sysinit", SYSINIT},
160 {"respawn", RESPAWN},
161 {"askfirst", ASKFIRST},
164 {"ctrlaltdel", CTRLALTDEL},
168 /* Set up a linked list of initActions, to be read from inittab */
169 typedef struct initActionTag initAction;
170 struct initActionTag {
175 initActionEnum action;
177 static initAction *initActionList = NULL;
180 static char *secondConsole = VT_SECONDARY;
181 static char *thirdConsole = VT_THIRD;
182 static char *fourthConsole = VT_FOURTH;
183 static char *log = VT_LOG;
184 static int kernelVersion = 0;
185 static char termType[32] = "TERM=linux";
186 static char console[32] = _PATH_CONSOLE;
188 static void delete_initAction(initAction * action);
191 /* Print a message to the specified device.
192 * Device may be bitwise-or'd from LOG | CONSOLE */
193 static void message(int device, char *fmt, ...)
194 __attribute__ ((format (printf, 2, 3)));
195 static void message(int device, char *fmt, ...)
202 /* Log the message to syslogd */
206 va_start(arguments, fmt);
207 vsnprintf(msg, sizeof(msg), fmt, arguments);
209 openlog(applet_name, 0, LOG_USER);
210 syslog(LOG_USER|LOG_INFO, msg);
214 static int log_fd = -1;
216 /* Take full control of the log tty, and never close it.
217 * It's mine, all mine! Muhahahaha! */
220 /* don't even try to log, because there is no such console */
222 /* log to main console instead */
224 } else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
226 fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
231 if ((device & LOG) && (log_fd >= 0)) {
232 va_start(arguments, fmt);
233 vdprintf(log_fd, fmt, arguments);
238 if (device & CONSOLE) {
239 /* Always send console messages to /dev/console so people will see them. */
242 device_open(_PATH_CONSOLE,
243 O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
244 va_start(arguments, fmt);
245 vdprintf(fd, fmt, arguments);
249 fprintf(stderr, "Bummer, can't print: ");
250 va_start(arguments, fmt);
251 vfprintf(stderr, fmt, arguments);
257 /* Set terminal settings to reasonable defaults */
258 static 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)
403 char *cmd[255], *cmdpath;
405 static const char press_enter[] =
407 #ifdef CUSTOMIZED_BANNER
408 #include CUSTOMIZED_BANNER
411 "\nPlease press Enter to activate this console. ";
412 char *environment[MAXENV+1] = {
414 "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
420 while (environment[i]) i++;
421 while ((environ[j]) && (i < MAXENV)) {
422 if (strncmp(environ[j], "TERM=", 5))
423 environment[i++] = environ[j];
427 if ((pid = fork()) == 0) {
429 ioctl(0, TIOCNOTTY, 0);
435 /* Reset signal handlers set for parent process */
436 signal(SIGUSR1, SIG_DFL);
437 signal(SIGUSR2, SIG_DFL);
438 signal(SIGINT, SIG_DFL);
439 signal(SIGTERM, SIG_DFL);
440 signal(SIGHUP, SIG_DFL);
442 if ((fd = device_open(terminal, O_RDWR)) < 0) {
444 if (stat(terminal, &statBuf) != 0) {
445 message(LOG | CONSOLE, "device '%s' does not exist.\n",
449 message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
455 ioctl(0, TIOCSCTTY, 1);
456 tcsetpgrp(0, getpgrp());
459 if (get_enter == TRUE) {
461 * Save memory by not exec-ing anything large (like a shell)
462 * before the user wants it. This is critical if swap is not
463 * enabled and the system has low memory. Generally this will
464 * be run on the second virtual console, and the first will
465 * be allowed to start a shell or whatever an init script
469 message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
470 command, getpid(), terminal);
472 write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
477 /* Log the process name and args */
478 message(LOG, "Starting pid %d, console %s: '%s'\r\n",
479 getpid(), terminal, command);
482 /* See if any special /bin/sh requiring characters are present */
483 if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
486 strcpy(buf, "exec ");
487 strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
491 /* Convert command (char*) into cmd (char**, one word per string) */
492 for (tmpCmd = command, i = 0;
493 (tmpCmd = strsep(&command, " \t")) != NULL;) {
494 if (*tmpCmd != '\0') {
506 Interactive shells want to see a dash in argv[0]. This
507 typically is handled by login, argv will be setup this
508 way if a dash appears at the front of the command path
512 if (*cmdpath == '-') {
515 /* skip over the dash */
518 /* find the last component in the command pathname */
519 s = get_last_path_component(cmdpath);
521 /* make a new argv[0] */
522 if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
523 message(LOG | CONSOLE, "malloc failed");
531 #if defined BB_FEATURE_INIT_COREDUMPS
534 if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
536 limit.rlim_cur = RLIM_INFINITY;
537 limit.rlim_max = RLIM_INFINITY;
538 setrlimit(RLIMIT_CORE, &limit);
543 /* Now run it. The new program will take over this PID,
544 * so nothing further in init.c should be run. */
545 execve(cmdpath, cmd, environment);
547 /* We're still here? Some error happened. */
548 message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
555 static int waitfor(char *command, char *terminal, int get_enter)
558 int pid = run(command, terminal, get_enter);
561 wpid = wait(&status);
562 if (wpid > 0 && wpid != pid) {
571 /* Make sure there is enough memory to do something useful. *
572 * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
573 static void check_memory()
577 if (check_free_memory() > 1000)
580 if (stat("/etc/fstab", &statBuf) == 0) {
581 /* swapon -a requires /proc typically */
582 waitfor("mount proc /proc -t proc", console, FALSE);
583 /* Try to turn on swap */
584 waitfor("swapon -a", console, FALSE);
585 if (check_free_memory() < 1000)
593 "Sorry, your computer does not have enough memory.\r\n");
598 /* Run all commands to be run right before halt/reboot */
599 static void run_lastAction(void)
602 for (a = initActionList; a; a = tmp) {
604 if (a->action == CTRLALTDEL) {
605 waitfor(a->process, a->console, FALSE);
606 delete_initAction(a);
613 static void shutdown_system(void)
616 /* first disable our SIGHUP signal */
617 signal(SIGHUP, SIG_DFL);
619 /* Allow Ctrl-Alt-Del to reboot system. */
620 init_reboot(RB_ENABLE_CAD);
622 message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
625 /* Send signals to every process _except_ pid 1 */
626 message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
631 message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
635 /* run everything to be run at "ctrlaltdel" */
639 if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
640 /* bdflush, kupdate not needed for kernels >2.2.11 */
646 static void halt_signal(int sig)
650 "The system is halted. Press %s or turn off power\r\n",
651 (secondConsole == NULL) /* serial console */
652 ? "Reset" : "CTRL-ALT-DEL");
655 /* allow time for last message to reach serial console */
658 if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
659 init_reboot(RB_POWER_OFF);
661 init_reboot(RB_HALT_SYSTEM);
665 static void reboot_signal(int sig)
668 message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
671 /* allow time for last message to reach serial console */
674 init_reboot(RB_AUTOBOOT);
678 #endif /* ! DEBUG_INIT */
680 static void new_initAction(initActionEnum action, char *process, char *cons)
682 initAction *newAction;
687 /* If BusyBox detects that a serial console is in use,
688 * then entries not refering to the console or null devices will _not_ be run.
689 * The exception to this rule is the null device.
691 if (secondConsole == NULL && strcmp(cons, console)
692 && strcmp(cons, "/dev/null"))
695 newAction = calloc((size_t) (1), sizeof(initAction));
697 message(LOG | CONSOLE, "Memory allocation failure\n");
701 newAction->nextPtr = initActionList;
702 initActionList = newAction;
703 strncpy(newAction->process, process, 255);
704 newAction->action = action;
705 strncpy(newAction->console, cons, 255);
707 // message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
708 // newAction->process, newAction->action, newAction->console);
711 static void delete_initAction(initAction * action)
713 initAction *a, *b = NULL;
715 for (a = initActionList; a; b = a, a = a->nextPtr) {
718 initActionList = a->nextPtr;
720 b->nextPtr = a->nextPtr;
728 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
729 * then parse_inittab() simply adds in some default
730 * actions(i.e runs INIT_SCRIPT and then starts a pair
731 * of "askfirst" shells). If BB_FEATURE_USE_INITTAB
732 * _is_ defined, but /etc/inittab is missing, this
733 * results in the same set of default behaviors.
735 static void parse_inittab(void)
737 #ifdef BB_FEATURE_USE_INITTAB
739 char buf[256], lineAsRead[256], tmpConsole[256];
740 char *id, *runlev, *action, *process, *eol;
741 const struct initActionType *a = actions;
745 file = fopen(INITTAB, "r");
747 /* No inittab file -- set up some default behavior */
749 /* Swapoff on halt/reboot */
750 new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
751 /* Umount all filesystems on halt/reboot */
752 new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
753 /* Askfirst shell on tty1 */
754 new_initAction(ASKFIRST, SHELL, console);
755 /* Askfirst shell on tty2 */
756 if (secondConsole != NULL)
757 new_initAction(ASKFIRST, SHELL, secondConsole);
758 /* Askfirst shell on tty3 */
759 if (thirdConsole != NULL)
760 new_initAction(ASKFIRST, SHELL, thirdConsole);
761 /* Askfirst shell on tty4 */
762 if (fourthConsole != NULL)
763 new_initAction(ASKFIRST, SHELL, fourthConsole);
765 new_initAction(SYSINIT, INIT_SCRIPT, console);
768 #ifdef BB_FEATURE_USE_INITTAB
771 while (fgets(buf, 255, file) != NULL) {
773 /* Skip leading spaces */
774 for (id = buf; *id == ' ' || *id == '\t'; id++);
776 /* Skip the line if it's a comment */
777 if (*id == '#' || *id == '\n')
780 /* Trim the trailing \n */
781 eol = strrchr(id, '\n');
785 /* Keep a copy around for posterity's sake (and error msgs) */
786 strcpy(lineAsRead, buf);
788 /* Separate the ID field from the runlevels */
789 runlev = strchr(id, ':');
790 if (runlev == NULL || *(runlev + 1) == '\0') {
791 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
798 /* Separate the runlevels from the action */
799 action = strchr(runlev, ':');
800 if (action == NULL || *(action + 1) == '\0') {
801 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
808 /* Separate the action from the process */
809 process = strchr(action, ':');
810 if (process == NULL || *(process + 1) == '\0') {
811 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
818 /* Ok, now process it */
820 while (a->name != 0) {
821 if (strcmp(a->name, action) == 0) {
823 strcpy(tmpConsole, "/dev/");
824 strncat(tmpConsole, id, 200);
827 new_initAction(a->action, process, id);
835 /* Choke on an unknown action */
836 message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
840 #endif /* BB_FEATURE_USE_INITTAB */
845 extern int init_main(int argc, char **argv)
852 /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
854 #ifdef BB_FEATURE_LINUXRC
855 && strstr(applet_name, "linuxrc") == NULL
861 /* Set up sig handlers -- be sure to
862 * clear all of these in run() */
863 signal(SIGUSR1, halt_signal);
864 signal(SIGUSR2, halt_signal);
865 signal(SIGINT, reboot_signal);
866 signal(SIGTERM, reboot_signal);
868 /* Turn off rebooting via CTL-ALT-DEL -- we get a
869 * SIGINT on CAD so we can shut things down gracefully... */
870 init_reboot(RB_DISABLE_CAD);
873 /* Figure out what kernel this is running */
874 kernelVersion = get_kernel_revision();
876 /* Figure out where the default console should be */
879 /* Close whatever files are open, and reset the console. */
887 /* Make sure PATH is set to something sane */
888 putenv("PATH="_PATH_STDPATH);
893 #if ! defined BB_FEATURE_EXTRA_QUIET
897 "init started: %s\r\n", full_version);
900 #if ! defined BB_FEATURE_EXTRA_QUIET
904 "init(%d) started: %s\r\n", getpid(), full_version);
908 /* Make sure there is enough memory to do something useful. */
911 /* Check if we are supposed to be in single user mode */
912 if (argc > 1 && (!strcmp(argv[1], "single") ||
913 !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
914 /* Ask first then start a shell on tty2-4 */
915 if (secondConsole != NULL)
916 new_initAction(ASKFIRST, SHELL, secondConsole);
917 if (thirdConsole != NULL)
918 new_initAction(ASKFIRST, SHELL, thirdConsole);
919 if (fourthConsole != NULL)
920 new_initAction(ASKFIRST, SHELL, fourthConsole);
921 /* Start a shell on tty1 */
922 new_initAction(RESPAWN, SHELL, console);
924 /* Not in single user mode -- see what inittab says */
926 /* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
927 * then parse_inittab() simply adds in some default
928 * actions(i.e runs INIT_SCRIPT and then starts a pair
929 * of "askfirst" shells */
933 /* Fix up argv[0] to be certain we claim to be init */
939 /* Now run everything that needs to be run */
941 /* First run the sysinit command */
942 for (a = initActionList; a; a = tmp) {
944 if (a->action == SYSINIT) {
945 waitfor(a->process, a->console, FALSE);
946 /* Now remove the "sysinit" entry from the list */
947 delete_initAction(a);
950 /* Next run anything that wants to block */
951 for (a = initActionList; a; a = tmp) {
953 if (a->action == WAIT) {
954 waitfor(a->process, a->console, FALSE);
955 /* Now remove the "wait" entry from the list */
956 delete_initAction(a);
959 /* Next run anything to be run only once */
960 for (a = initActionList; a; a = tmp) {
962 if (a->action == ONCE) {
963 run(a->process, a->console, FALSE);
964 /* Now remove the "once" entry from the list */
965 delete_initAction(a);
968 /* If there is nothing else to do, stop */
969 if (initActionList == NULL) {
970 message(LOG | CONSOLE,
971 "No more tasks for init -- sleeping forever.\n");
976 /* Now run the looping stuff for the rest of forever */
978 for (a = initActionList; a; a = a->nextPtr) {
979 /* Only run stuff with pid==0. If they have
980 * a pid, that means they are still running */
984 /* run the respawn stuff */
985 a->pid = run(a->process, a->console, FALSE);
988 /* run the askfirst stuff */
989 a->pid = run(a->process, a->console, TRUE);
991 /* silence the compiler's incessant whining */
997 /* Wait for a child process to exit */
998 wpid = wait(&status);
1000 /* Find out who died and clean up their corpse */
1001 for (a = initActionList; a; a = a->nextPtr) {
1002 if (a->pid == wpid) {
1005 "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
1016 c-file-style: "linux"