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busybox/init/init.c
Erik Andersen 04e97024e7 Clear up some ambiguity with old style assignments. 
-Erik
2000-01-29 07:06:24 +00:00

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/* vi: set sw=4 ts=4: */
/*
* Mini init implementation for busybox
*
*
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
* Adjusted by so many folks, it's impossible to keep track.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <termios.h>
#include <paths.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/wait.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include <sys/kdaemon.h>
#include <sys/sysmacros.h>
#include <linux/serial.h> /* for serial_struct */
#include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h>
#include <linux/version.h>
#ifdef BB_SYSLOGD
#include <sys/syslog.h>
#endif
#if ! defined BB_FEATURE_USE_PROCFS
#error Sorry, I depend on the /proc filesystem right now.
#endif
#ifndef KERNEL_VERSION
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#endif
#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
#define VT_SECONDARY "/dev/tty2" /* Virtual console */
#define VT_LOG "/dev/tty3" /* Virtual console */
#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
#define SHELL "/bin/sh" /* Default shell */
#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef INIT_SCRIPT
#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
#endif
#define LOG 0x1
#define CONSOLE 0x2
/* Allowed init action types */
typedef enum {
SYSINIT=1,
RESPAWN,
ASKFIRST,
WAIT,
ONCE
} initActionEnum;
/* And now a list of the actions we support in the version of init */
typedef struct initActionType{
const char* name;
initActionEnum action;
} initActionType;
static const struct initActionType actions[] = {
{"sysinit", SYSINIT},
{"respawn", RESPAWN},
{"askfirst", ASKFIRST},
{"wait", WAIT},
{"once", ONCE},
{0}
};
/* Set up a linked list of initactions, to be read from inittab */
typedef struct initActionTag initAction;
struct initActionTag {
pid_t pid;
char process[256];
char console[256];
initAction *nextPtr;
initActionEnum action;
};
initAction* initActionList = NULL;
static char *secondConsole = VT_SECONDARY;
static char *log = VT_LOG;
static int kernelVersion = 0;
static char termType[32] = "TERM=ansi";
static char console[32] = _PATH_CONSOLE;
/* try to open up the specified device */
int device_open(char *device, int mode)
{
int m, f, fd = -1;
m = mode | O_NONBLOCK;
/* Retry up to 5 times */
for (f = 0; f < 5; f++)
if ((fd = open(device, m)) >= 0)
break;
if (fd < 0)
return fd;
/* Reset original flags. */
if (m != mode)
fcntl(fd, F_SETFL, mode);
return fd;
}
/* print a message to the specified device:
* device may be bitwise-or'd from LOG | CONSOLE */
void message(int device, char *fmt, ...)
{
va_list arguments;
int fd;
#ifdef BB_SYSLOGD
/* Log the message to syslogd */
if (device & LOG ) {
char msg[1024];
va_start(arguments, fmt);
vsnprintf(msg, sizeof(msg), fmt, arguments);
va_end(arguments);
openlog( "init", 0, LOG_DAEMON);
syslog(LOG_DAEMON|LOG_NOTICE, msg);
closelog();
}
#else
static int log_fd = -1;
/* Take full control of the log tty, and never close it.
* It's mine, all mine! Muhahahaha! */
if (log_fd < 0) {
if (log == NULL) {
/* don't even try to log, because there is no such console */
log_fd = -2;
/* log to main console instead */
device = CONSOLE;
}
else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
log_fd = -1;
fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
fflush(stderr);
return;
}
}
if ( (device & LOG) && (log_fd >= 0) ) {
va_start(arguments, fmt);
vdprintf(log_fd, fmt, arguments);
va_end(arguments);
}
#endif
if (device & CONSOLE) {
/* Always send console messages to /dev/console so people will see them. */
if ((fd = device_open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) {
va_start(arguments, fmt);
vdprintf(fd, fmt, arguments);
va_end(arguments);
close(fd);
} else {
fprintf(stderr, "Bummer, can't print: ");
va_start(arguments, fmt);
vfprintf(stderr, fmt, arguments);
fflush(stderr);
va_end(arguments);
}
}
}
/* Set terminal settings to reasonable defaults */
void set_term( int fd)
{
struct termios tty;
static const char control_characters[] = {
'\003', '\034', '\177', '\025', '\004', '\0',
'\1', '\0', '\021', '\023', '\032', '\0', '\022',
'\017', '\027', '\026', '\0'
};
tcgetattr(fd, &tty);
/* set control chars */
memcpy(tty.c_cc, control_characters, sizeof(control_characters));
/* use line dicipline 0 */
tty.c_line = 0;
/* Make it be sane */
//tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
//tty.c_cflag |= HUPCL|CLOCAL;
/* input modes */
tty.c_iflag = ICRNL|IXON|IXOFF;
/* output modes */
tty.c_oflag = OPOST|ONLCR;
/* local modes */
tty.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN;
tcsetattr(fd, TCSANOW, &tty);
}
/* How much memory does this machine have? */
static int mem_total()
{
char s[80];
char *p = "/proc/meminfo";
FILE *f;
const char pattern[] = "MemTotal:";
if ((f = fopen(p, "r")) < 0) {
message(LOG, "Error opening %s: %s\n", p, strerror( errno));
return -1;
}
while (NULL != fgets(s, 79, f)) {
p = strstr(s, pattern);
if (NULL != p) {
fclose(f);
return (atoi(p + strlen(pattern)));
}
}
return -1;
}
static void console_init()
{
int fd;
int tried_devcons = 0;
int tried_vtprimary = 0;
struct serial_struct sr;
char *s;
if ((s = getenv("TERM")) != NULL) {
snprintf(termType,sizeof(termType)-1,"TERM=%s",s);
}
if ((s = getenv("CONSOLE")) != NULL) {
snprintf(console, sizeof(console)-1, "%s",s);
}
#if #cpu(sparc)
/* sparc kernel supports console=tty[ab] parameter which is also
* passed to init, so catch it here */
else if ((s = getenv("console")) != NULL) {
/* remap tty[ab] to /dev/ttyS[01] */
if (strcmp( s, "ttya" )==0)
snprintf(console, sizeof(console)-1, "%s", SERIAL_CON0);
else if (strcmp( s, "ttyb" )==0)
snprintf(console, sizeof(console)-1, "%s", SERIAL_CON1);
}
#endif
else {
struct vt_stat vt;
/* 2.2 kernels: identify the real console backend and try to use it */
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
/* this is a serial console */
snprintf(console, sizeof(console)-1, "/dev/ttyS%d", sr.line);
}
else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
/* this is linux virtual tty */
snprintf(console, sizeof(console)-1, "/dev/tty%d", vt.v_active);
} else {
snprintf(console, sizeof(console)-1, "%s", _PATH_CONSOLE);
tried_devcons++;
}
}
while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
/* Can't open selected console -- try /dev/console */
if (!tried_devcons) {
tried_devcons++;
snprintf(console, sizeof(console)-1, "%s", _PATH_CONSOLE);
continue;
}
/* Can't open selected console -- try vt1 */
if (!tried_vtprimary) {
tried_vtprimary++;
snprintf(console, sizeof(console)-1, "%s", VT_PRIMARY);
continue;
}
break;
}
if (fd < 0) {
/* Perhaps we should panic here? */
snprintf(console, sizeof(console)-1, "/dev/null");
} else {
/* check for serial console and disable logging to tty3 & running a
* shell to tty2 */
if (ioctl(0,TIOCGSERIAL,&sr) == 0) {
message(LOG|CONSOLE, "serial console detected. Disabling virtual terminals.\r\n" );
log = NULL;
secondConsole = NULL;
}
close(fd);
}
message(LOG, "console=%s\n", console );
}
static pid_t run(char* command,
char *terminal, int get_enter)
{
int i, fd;
pid_t pid;
char* tmpCmd;
char* cmd[255];
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
char* environment[] = {
"HOME=/",
"PATH=/usr/bin:/bin:/usr/sbin:/sbin",
"SHELL=/bin/sh",
termType,
"USER=root",
0
};
if ((pid = fork()) == 0) {
pid_t shell_pgid = getpid ();
/* Clean up */
close(0);
close(1);
close(2);
setsid();
/* Reset signal handlers set for parent process */
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGHUP, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
exit(1);
}
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
tcsetpgrp (0, getpgrp());
set_term(0);
if (get_enter==TRUE) {
/*
* Save memory by not exec-ing anything large (like a shell)
* before the user wants it. This is critical if swap is not
* enabled and the system has low memory. Generally this will
* be run on the second virtual console, and the first will
* be allowed to start a shell or whatever an init script
* specifies.
*/
char c;
message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
command, shell_pgid, terminal );
write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
read(fileno(stdin), &c, 1);
}
/* Log the process name and args */
message(LOG, "Starting pid %d, console %s: '",
shell_pgid, terminal, command);
/* Convert command (char*) into cmd (char**, one word per string) */
for (tmpCmd=command, i=0; (tmpCmd=strsep(&command, " \t")) != NULL;) {
if (*tmpCmd != '\0') {
cmd[i] = tmpCmd;
message(LOG, "%s ", tmpCmd);
tmpCmd++;
i++;
}
}
cmd[i] = NULL;
message(LOG, "'\r\n");
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
execve(cmd[0], cmd, environment);
/* We're still here? Some error happened. */
message(LOG|CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0],
strerror(errno));
exit(-1);
}
return pid;
}
static int waitfor(char* command,
char *terminal, int get_enter)
{
int status, wpid;
int pid = run( command, terminal, get_enter);
while (1) {
wpid = wait(&status);
if (wpid > 0 ) {
message(LOG, "Process '%s' (pid %d) exited.\n",
command, wpid);
break;
}
if (wpid == pid )
break;
}
return wpid;
}
/* Make sure there is enough memory to do something useful. *
* Calls swapon if needed so be sure /proc is mounted. */
static void check_memory()
{
struct stat statBuf;
if (mem_total() > 3500)
return;
if (stat("/etc/fstab", &statBuf) == 0) {
/* Try to turn on swap */
waitfor("/bin/swapon swapon -a", log, FALSE);
if (mem_total() < 3500)
goto goodnight;
} else
goto goodnight;
return;
goodnight:
message(CONSOLE, "Sorry, your computer does not have enough memory.\r\n");
while (1) sleep(1);
}
#ifndef DEBUG_INIT
static void shutdown_system(void)
{
/* first disable our SIGHUP signal */
signal(SIGHUP, SIG_DFL);
/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
message(CONSOLE, "\r\nThe system is going down NOW !!\r\n");
sync();
/* Send signals to every process _except_ pid 1 */
message(CONSOLE, "Sending SIGHUP to all processes.\r\n");
kill(-1, SIGHUP);
sleep(2);
sync();
message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
kill(-1, SIGKILL);
sleep(1);
message(CONSOLE, "Disabling swap.\r\n");
waitfor( "swapoff -a", console, FALSE);
message(CONSOLE, "Unmounting filesystems.\r\n");
waitfor("umount -a", console, FALSE);
sync();
if (kernelVersion > 0 && kernelVersion <= 2 * 65536 + 2 * 256 + 11) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
bdflush(1, 0);
sync();
}
}
static void halt_signal(int sig)
{
shutdown_system();
message(CONSOLE, "The system is halted. Press %s or turn off power\r\n",
(secondConsole == NULL) /* serial console */
? "Reset" : "CTRL-ALT-DEL");
sync();
/* allow time for last message to reach serial console */
sleep(2);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
if (sig == SIGUSR2)
reboot(RB_POWER_OFF);
else
#endif
reboot(RB_HALT_SYSTEM);
exit(0);
}
static void reboot_signal(int sig)
{
shutdown_system();
message(CONSOLE, "Please stand by while rebooting the system.\r\n");
sync();
/* allow time for last message to reach serial console */
sleep(2);
reboot(RB_AUTOBOOT);
exit(0);
}
#if defined BB_FEATURE_INIT_CHROOT
static void check_chroot(int sig)
{
char *argv_init[2] = { "init", NULL, };
char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
char rootpath[256], *tc;
int fd;
if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
message(CONSOLE, "SIGHUP recived, but could not open proc file\r\n");
sleep(2);
return;
}
if (read(fd, rootpath, sizeof(rootpath)) == -1) {
message(CONSOLE, "SIGHUP recived, but could not read proc file\r\n");
sleep(2);
return;
}
close(fd);
if (rootpath[0] == '\0') {
message(CONSOLE, "SIGHUP recived, but new root is not valid: %s\r\n",
rootpath);
sleep(2);
return;
}
tc = strrchr(rootpath, '\n');
*tc = '\0';
/* Ok, making it this far means we commit */
message(CONSOLE, "Please stand by, changing root to `%s'.\r\n", rootpath);
/* kill all other programs first */
message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
kill(-1, SIGTERM);
sleep(2);
sync();
message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
kill(-1, SIGKILL);
sleep(2);
sync();
/* ok, we don't need /proc anymore. we also assume that the signaling
* process left the rest of the filesystems alone for us */
umount("/proc");
/* Ok, now we chroot. Hopefully we only have two things mounted, the
* new chroot'd mount point, and the old "/" mount. s,
* we go ahead and unmount the old "/". This should trigger the kernel
* to set things up the Right Way(tm). */
if (!chroot(rootpath))
umount("/dev/root");
/* If the chroot fails, we are already too far to turn back, so we
* continue and hope that executing init below will revive the system */
/* close all of our descriptors and open new ones */
close(0);
close(1);
close(2);
open("/dev/console", O_RDWR, 0);
dup(0);
dup(0);
message(CONSOLE, "Executing real init...\r\n");
/* execute init in the (hopefully) new root */
execve("/sbin/init",argv_init,envp_init);
message(CONSOLE, "ERROR: Could not exec new init. Press %s to reboot.\r\n",
(secondConsole == NULL) /* serial console */
? "Reset" : "CTRL-ALT-DEL");
return;
}
#endif /* BB_FEATURE_INIT_CHROOT */
#endif /* ! DEBUG_INIT */
void new_initAction (initActionEnum action,
char* process, char* cons)
{
initAction* newAction;
if (*cons == '\0')
cons = console;
/* If BusyBox detects that a serial console is in use,
* then entries not refering to the console or null devices will _not_ be run.
* The exception to this rule is the null device.
*/
if (secondConsole == NULL && strcmp(cons, console) && strcmp(cons, "/dev/null"))
return;
newAction = calloc ((size_t)(1), sizeof(initAction));
if (!newAction) {
message(LOG|CONSOLE,"Memory allocation failure\n");
while (1) sleep(1);
}
newAction->nextPtr = initActionList;
initActionList = newAction;
strncpy( newAction->process, process, 255);
newAction->action = action;
strncpy(newAction->console, cons, 255);
newAction->pid = 0;
// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
// newAction->process, newAction->action, newAction->console);
}
void delete_initAction (initAction *action)
{
initAction *a, *b=NULL;
for( a=initActionList ; a ; b=a, a=a->nextPtr) {
if (a == action) {
if (b==NULL) {
initActionList=a->nextPtr;
} else {
b->nextPtr=a->nextPtr;
}
free( a);
break;
}
}
}
/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
* then parse_inittab() simply adds in some default
* actions(i.e runs INIT_SCRIPT and then starts a pair
* of "askfirst" shells). If BB_FEATURE_USE_INITTAB
* _is_ defined, but /etc/inittab is missing, this
* results in the same set of default behaviors.
* */
void parse_inittab(void)
{
#ifdef BB_FEATURE_USE_INITTAB
FILE* file;
char buf[256], lineAsRead[256], tmpConsole[256];
char *p, *q, *r, *s;
const struct initActionType *a = actions;
int foundIt;
file = fopen(INITTAB, "r");
if (file == NULL) {
/* No inittab file -- set up some default behavior */
#endif
/* Askfirst shell on tty1 */
new_initAction( ASKFIRST, SHELL, console );
/* Askfirst shell on tty2 */
if (secondConsole != NULL)
new_initAction( ASKFIRST, SHELL, secondConsole );
/* sysinit */
new_initAction( SYSINIT, INIT_SCRIPT, console );
return;
#ifdef BB_FEATURE_USE_INITTAB
}
while ( fgets(buf, 255, file) != NULL) {
foundIt=FALSE;
for(p = buf; *p == ' ' || *p == '\t'; p++);
if (*p == '#' || *p == '\n') continue;
/* Trim the trailing \n */
q = strrchr( p, '\n');
if (q != NULL)
*q='\0';
/* Keep a copy around for posterity's sake (and error msgs) */
strcpy(lineAsRead, buf);
/* Grab the ID field */
s=p;
p = strchr( p, ':');
if ( p != NULL || *(p+1) != '\0' ) {
*p='\0';
++p;
}
/* Now peal off the process field from the end
* of the string */
q = strrchr( p, ':');
if ( q == NULL || *(q+1) == '\0' ) {
message(LOG|CONSOLE,"Bad inittab entry: %s\n", lineAsRead);
continue;
} else {
*q='\0';
++q;
}
/* Now peal off the action field */
r = strrchr( p, ':');
if ( r == NULL || *(r+1) == '\0') {
message(LOG|CONSOLE,"Bad inittab entry: %s\n", lineAsRead);
continue;
} else {
++r;
}
/* Ok, now process it */
a = actions;
while (a->name != 0) {
if (strcmp(a->name, r) == 0) {
if (*s != '\0') {
struct stat statBuf;
strcpy(tmpConsole, "/dev/");
strncat(tmpConsole, s, 200);
if (stat(tmpConsole, &statBuf) != 0) {
message(LOG|CONSOLE, "device '%s' does not exist. Did you read the directions?\n", tmpConsole);
break;
}
s = tmpConsole;
}
new_initAction( a->action, q, s);
foundIt=TRUE;
}
a++;
}
if (foundIt==TRUE)
continue;
else {
/* Choke on an unknown action */
message(LOG|CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
}
}
return;
#endif
}
extern int init_main(int argc, char **argv)
{
initAction *a;
pid_t wpid;
int status;
#ifndef DEBUG_INIT
/* Expect to be PID 1 if we are run as init (not linuxrc) */
if (getpid() != 1 && strstr(argv[0], "init")!=NULL ) {
usage( "init\n\nInit is the parent of all processes.\n\n"
"This version of init is designed to be run only by the kernel\n");
}
/* Fix up argv[0] to be certain we claim to be init */
strncpy(argv[0], "init", strlen(argv[0]));
/* Set up sig handlers -- be sure to
* clear all of these in run() */
signal(SIGUSR1, halt_signal);
signal(SIGUSR2, reboot_signal);
signal(SIGINT, reboot_signal);
signal(SIGTERM, reboot_signal);
#if defined BB_FEATURE_INIT_CHROOT
signal(SIGHUP, check_chroot);
#endif
/* Turn off rebooting via CTL-ALT-DEL -- we get a
* SIGINT on CAD so we can shut things down gracefully... */
reboot(RB_DISABLE_CAD);
#endif
/* Figure out where the default console should be */
console_init();
/* Close whatever files are open, and reset the console. */
close(0);
close(1);
close(2);
set_term(0);
setsid();
/* Make sure PATH is set to something sane */
putenv(_PATH_STDPATH);
/* Hello world */
#ifndef DEBUG_INIT
message(LOG|CONSOLE,
"init started: BusyBox v%s (%s) multi-call binary\r\n",
BB_VER, BB_BT);
#else
message(LOG|CONSOLE,
"init(%d) started: BusyBox v%s (%s) multi-call binary\r\n",
getpid(), BB_VER, BB_BT);
#endif
/* Mount /proc */
if (mount ("proc", "/proc", "proc", 0, 0) == 0) {
message(LOG|CONSOLE, "Mounting /proc: done.\n");
kernelVersion = get_kernel_revision();
} else
message(LOG|CONSOLE, "Mounting /proc: failed!\n");
/* Make sure there is enough memory to do something useful. */
check_memory();
/* Check if we are supposed to be in single user mode */
if ( argc > 1 && (!strcmp(argv[1], "single") ||
!strcmp(argv[1], "-s") || !strcmp(argv[1], "1")))
{
/* Ask first then start a shell on tty2 */
if (secondConsole != NULL)
new_initAction( ASKFIRST, SHELL, secondConsole);
/* Start a shell on tty1 */
new_initAction( RESPAWN, SHELL, console);
} else {
/* Not in single user mode -- see what inittab says */
/* NOTE that if BB_FEATURE_USE_INITTAB is NOT defined,
* then parse_inittab() simply adds in some default
* actions(i.e runs INIT_SCRIPT and then starts a pair
* of "askfirst" shells */
parse_inittab();
}
/* Now run everything that needs to be run */
/* First run the sysinit command */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == SYSINIT) {
waitfor(a->process, a->console, FALSE);
/* Now remove the "sysinit" entry from the list */
delete_initAction( a);
}
}
/* Next run anything that wants to block */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == WAIT) {
waitfor(a->process, a->console, FALSE);
/* Now remove the "wait" entry from the list */
delete_initAction( a);
}
}
/* Next run anything to be run only once */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->action == ONCE) {
run(a->process, a->console, FALSE);
/* Now remove the "once" entry from the list */
delete_initAction( a);
}
}
/* If there is nothing else to do, stop */
if (initActionList == NULL) {
message(LOG|CONSOLE, "No more tasks for init -- sleeping forever.\n");
while (1) sleep(1);
}
/* Now run the looping stuff for the rest of forever */
while (1) {
for( a=initActionList ; a; a=a->nextPtr) {
/* Only run stuff with pid==0. If they have
* a pid, that means they are still running */
if (a->pid == 0) {
switch(a->action) {
case RESPAWN:
/* run the respawn stuff */
a->pid = run(a->process, a->console, FALSE);
break;
case ASKFIRST:
/* run the askfirst stuff */
a->pid = run(a->process, a->console, TRUE);
break;
/* silence the compiler's incessant whining */
default:
break;
}
}
}
/* Wait for a child process to exit */
wpid = wait(&status);
if (wpid > 0 ) {
/* Find out who died and clean up their corpse */
for( a=initActionList ; a; a=a->nextPtr) {
if (a->pid==wpid) {
a->pid=0;
message(LOG, "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
a->process, wpid);
}
}
}
sleep(1);
}
}
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