diff options
Diffstat (limited to 'init.c')
| -rw-r--r-- | init.c | 1045 |
1 files changed, 0 insertions, 1045 deletions
@@ -1,1045 +0,0 @@ -/* 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 - * - */ - -/* Turn this on to disable all the dangerous - rebooting stuff when debugging. -#define DEBUG_INIT -*/ - -#include <stdio.h> -#include <stdlib.h> -#include <errno.h> -#include <paths.h> -#include <signal.h> -#include <stdarg.h> -#include <string.h> -#include <termios.h> -#include <unistd.h> -#include <limits.h> -#include <sys/fcntl.h> -#include <sys/ioctl.h> -#include <sys/mount.h> -#include <sys/types.h> -#include <sys/wait.h> -#include "busybox.h" -#ifdef BB_SYSLOGD -# include <sys/syslog.h> -#endif - - -/* From <linux/vt.h> */ -struct vt_stat { - unsigned short v_active; /* active vt */ - unsigned short v_signal; /* signal to send */ - unsigned short v_state; /* vt bitmask */ -}; -static const int VT_GETSTATE = 0x5603; /* get global vt state info */ - -/* From <linux/serial.h> */ -struct serial_struct { - int type; - int line; - int port; - int irq; - int flags; - int xmit_fifo_size; - int custom_divisor; - int baud_base; - unsigned short close_delay; - char reserved_char[2]; - int hub6; - unsigned short closing_wait; /* time to wait before closing */ - unsigned short closing_wait2; /* no longer used... */ - int reserved[4]; -}; - - - -#ifndef RB_HALT_SYSTEM -static const int RB_HALT_SYSTEM = 0xcdef0123; -static const int RB_ENABLE_CAD = 0x89abcdef; -static const int RB_DISABLE_CAD = 0; -#define RB_POWER_OFF 0x4321fedc -static const int RB_AUTOBOOT = 0x01234567; -#endif - -#if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__) - #include <sys/reboot.h> - #define init_reboot(magic) reboot(magic) -#else - #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic) -#endif - -#ifndef _PATH_STDPATH -#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin" -#endif - - -#if defined BB_FEATURE_INIT_COREDUMPS -/* - * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called - * before processes are spawned to set core file size as unlimited. - * This is for debugging only. Don't use this is production, unless - * you want core dumps lying about.... - */ -#define CORE_ENABLE_FLAG_FILE "/.init_enable_core" -#include <sys/resource.h> -#include <sys/time.h> -#endif - -#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) - -#if __GNU_LIBRARY__ > 5 - #include <sys/kdaemon.h> -#else - extern int bdflush (int func, long int data); -#endif - - -#define SHELL "/bin/sh" /* Default shell */ -#define LOGIN_SHELL "-" SHELL /* Default login shell */ -#define INITTAB "/etc/inittab" /* inittab file location */ -#ifndef INIT_SCRIPT -#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */ -#endif - -#define MAXENV 16 /* Number of env. vars */ -//static const int MAXENV = 16; /* Number of env. vars */ -static const int LOG = 0x1; -static const int CONSOLE = 0x2; - -/* Allowed init action types */ -typedef enum { - SYSINIT = 1, - RESPAWN, - ASKFIRST, - WAIT, - ONCE, - CTRLALTDEL, - SHUTDOWN -} initActionEnum; - -/* A mapping between "inittab" action name strings and action type codes. */ -typedef struct initActionType { - const char *name; - initActionEnum action; -} initActionType; - -static const struct initActionType actions[] = { - {"sysinit", SYSINIT}, - {"respawn", RESPAWN}, - {"askfirst", ASKFIRST}, - {"wait", WAIT}, - {"once", ONCE}, - {"ctrlaltdel", CTRLALTDEL}, - {"shutdown", SHUTDOWN}, - {0, 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; -}; -static initAction *initActionList = NULL; - - -static char *secondConsole = VC_2; -static char *thirdConsole = VC_3; -static char *fourthConsole = VC_4; -static char *log = VC_5; -static int kernelVersion = 0; -static char termType[32] = "TERM=linux"; -static char console[32] = _PATH_CONSOLE; - -static void delete_initAction(initAction * action); - -static void loop_forever(void) -{ - while (1) - sleep (1); -} - -/* Print a message to the specified device. - * Device may be bitwise-or'd from LOG | CONSOLE */ -static void message(int device, char *fmt, ...) - __attribute__ ((format (printf, 2, 3))); -static 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); - syslog_msg(LOG_USER, LOG_USER|LOG_INFO, msg); - } -#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 = -2; - fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log); - log = NULL; - device = CONSOLE; - } - } - 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); - va_end(arguments); - } - } -} - -/* Set terminal settings to reasonable defaults */ -static void set_term(int fd) -{ - struct termios tty; - - tcgetattr(fd, &tty); - - /* set control chars */ - tty.c_cc[VINTR] = 3; /* C-c */ - tty.c_cc[VQUIT] = 28; /* C-\ */ - tty.c_cc[VERASE] = 127; /* C-? */ - tty.c_cc[VKILL] = 21; /* C-u */ - tty.c_cc[VEOF] = 4; /* C-d */ - tty.c_cc[VSTART] = 17; /* C-q */ - tty.c_cc[VSTOP] = 19; /* C-s */ - tty.c_cc[VSUSP] = 26; /* C-z */ - - /* use line dicipline 0 */ - tty.c_line = 0; - - /* Make it be sane */ - tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD; - tty.c_cflag |= CREAD|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? - Units are kBytes to avoid overflow on 4GB machines */ -static int check_free_memory(void) -{ - struct sysinfo info; - unsigned int result, u, s=10; - - if (sysinfo(&info) != 0) { - perror_msg("Error checking free memory"); - return -1; - } - - /* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes. - * Kernels 2.4.0 return info.mem_unit in bytes. */ - u = info.mem_unit; - if (u==0) u=1; - while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; } - result = (info.totalram>>s) + (info.totalswap>>s); - result = result*u; - if (result < 0) result = INT_MAX; - return result; -} - -static void console_init(void) -{ - int fd; - int tried_devcons = 0; - int tried_vtprimary = 0; - struct vt_stat vt; - struct serial_struct sr; - char *s; - - if ((s = getenv("TERM")) != NULL) { - snprintf(termType, sizeof(termType) - 1, "TERM=%s", s); - } - - if ((s = getenv("CONSOLE")) != NULL) { - safe_strncpy(console, s, sizeof(console)); - } -#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) - safe_strncpy(console, SC_0, sizeof(console)); - else if (strcmp(s, "ttyb") == 0) - safe_strncpy(console, SC_1, sizeof(console)); - } -#endif - else { - /* 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, SC_FORMAT, sr.line); - } else if (ioctl(0, VT_GETSTATE, &vt) == 0) { - /* this is linux virtual tty */ - snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active); - } else { - safe_strncpy(console, _PATH_CONSOLE, sizeof(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++; - safe_strncpy(console, _PATH_CONSOLE, sizeof(console)); - continue; - } - /* Can't open selected console -- try vt1 */ - if (!tried_vtprimary) { - tried_vtprimary++; - safe_strncpy(console, VC_1, sizeof(console)); - continue; - } - break; - } - if (fd < 0) { - /* Perhaps we should panic here? */ - safe_strncpy(console, "/dev/null", sizeof(console)); - } else { - /* check for serial console and disable logging to tty5 & running a - * shell to tty2-4 */ - if (ioctl(0, TIOCGSERIAL, &sr) == 0) { - log = NULL; - secondConsole = NULL; - thirdConsole = NULL; - fourthConsole = NULL; - /* Force the TERM setting to vt102 for serial console -- - * iff TERM is set to linux (the default) */ - if (strcmp( termType, "TERM=linux" ) == 0) - safe_strncpy(termType, "TERM=vt102", sizeof(termType)); - message(LOG | CONSOLE, - "serial console detected. Disabling virtual terminals.\r\n"); - } - close(fd); - } - message(LOG, "console=%s\n", console); -} - -static void fixup_argv(int argc, char **argv, char *new_argv0) -{ - int len; - /* Fix up argv[0] to be certain we claim to be init */ - len = strlen(argv[0]); - memset(argv[0], 0, len); - strncpy(argv[0], new_argv0, len); - - /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */ - len = 1; - while (argc > len) { - memset(argv[len], 0, strlen(argv[len])); - len++; - } -} - - -static pid_t run(char *command, char *terminal, int get_enter) -{ - int i, j; - int fd; - pid_t pid; - char *tmpCmd, *s; - char *cmd[255], *cmdpath; - char buf[255]; - struct stat sb; - static const char press_enter[] = - -#ifdef CUSTOMIZED_BANNER -#include CUSTOMIZED_BANNER -#endif - - "\nPlease press Enter to activate this console. "; - char *environment[MAXENV+1] = { - termType, - "HOME=/", - "PATH=/usr/bin:/bin:/usr/sbin:/sbin", - "SHELL=" SHELL, - "USER=root", - NULL - }; - - /* inherit environment to the child, merging our values -andy */ - for (i=0; environ[i]; i++) { - for (j=0; environment[j]; j++) { - s = strchr(environment[j], '='); - if (!strncmp(environ[i], environment[j], s - environment[j])) - break; - } - if (!environment[j]) { - environment[j++] = environ[i]; - environment[j] = NULL; - } - } - - if ((pid = fork()) == 0) { - /* Clean up */ - ioctl(0, TIOCNOTTY, 0); - 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) { - if (stat(terminal, &sb) != 0) { - message(LOG | CONSOLE, "device '%s' does not exist.\n", - terminal); - exit(1); - } - message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal); - exit(1); - } - dup2(fd, 0); - dup2(fd, 1); - dup2(fd, 2); - ioctl(0, TIOCSCTTY, 1); - tcsetpgrp(0, getpgrp()); - set_term(0); - - /* See if any special /bin/sh requiring characters are present */ - if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) { - cmd[0] = SHELL; - cmd[1] = "-c"; - strcpy(buf, "exec "); - strncat(buf, command, sizeof(buf) - strlen(buf) - 1); - cmd[2] = buf; - cmd[3] = NULL; - } else { - /* 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; - tmpCmd++; - i++; - } - } - cmd[i] = NULL; - } - - cmdpath = cmd[0]; - - /* - Interactive shells want to see a dash in argv[0]. This - typically is handled by login, argv will be setup this - way if a dash appears at the front of the command path - (like "-/bin/sh"). - */ - - if (*cmdpath == '-') { - - /* skip over the dash */ - ++cmdpath; - - /* find the last component in the command pathname */ - s = get_last_path_component(cmdpath); - - /* make a new argv[0] */ - if ((cmd[0] = malloc(strlen(s)+2)) == NULL) { - message(LOG | CONSOLE, "malloc failed"); - cmd[0] = cmdpath; - } else { - cmd[0][0] = '-'; - strcpy(cmd[0]+1, s); - } - } - - 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. - */ -#ifdef DEBUG_INIT - message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n", - cmd[0], getpid(), terminal); -#endif - write(fileno(stdout), press_enter, sizeof(press_enter) - 1); - getc(stdin); - } - -#ifdef DEBUG_INIT - /* Log the process name and args */ - message(LOG, "Starting pid %d, console %s: '%s'\r\n", - getpid(), terminal, command); -#endif - -#if defined BB_FEATURE_INIT_COREDUMPS - if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) { - struct rlimit limit; - limit.rlim_cur = RLIM_INFINITY; - limit.rlim_max = RLIM_INFINITY; - setrlimit(RLIMIT_CORE, &limit); - } -#endif - - /* Now run it. The new program will take over this PID, - * so nothing further in init.c should be run. */ - execve(cmdpath, cmd, environment); - - /* We're still here? Some error happened. */ - message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath, - 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 && wpid != pid) { - continue; - } - if (wpid == pid) - break; - } - return wpid; -} - -/* Make sure there is enough memory to do something useful. * - * Calls "swapon -a" if needed so be sure /etc/fstab is present... */ -static void check_memory(void) -{ - struct stat statBuf; - - if (check_free_memory() > 1000) - return; - - if (stat("/etc/fstab", &statBuf) == 0) { - /* swapon -a requires /proc typically */ - waitfor("mount proc /proc -t proc", console, FALSE); - /* Try to turn on swap */ - waitfor("swapon -a", console, FALSE); - if (check_free_memory() < 1000) - goto goodnight; - } else - goto goodnight; - return; - - goodnight: - message(CONSOLE, - "Sorry, your computer does not have enough memory.\r\n"); - loop_forever(); -} - -/* Run all commands to be run right before halt/reboot */ -static void run_actions(initActionEnum action) -{ - initAction *a, *tmp; - for (a = initActionList; a; a = tmp) { - tmp = a->nextPtr; - if (a->action == action) { - waitfor(a->process, a->console, FALSE); - delete_initAction(a); - } - } -} - - -#ifndef DEBUG_INIT -static void shutdown_system(void) -{ - - /* first disable our SIGHUP signal */ - signal(SIGHUP, SIG_DFL); - - /* Allow Ctrl-Alt-Del to reboot system. */ - init_reboot(RB_ENABLE_CAD); - - message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n"); - sync(); - - /* Send signals to every process _except_ pid 1 */ - message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n"); - kill(-1, SIGTERM); - sleep(1); - sync(); - - message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n"); - kill(-1, SIGKILL); - sleep(1); - - /* run everything to be run at "shutdown" */ - run_actions(SHUTDOWN); - - sync(); - if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) { - /* bdflush, kupdate not needed for kernels >2.2.11 */ - bdflush(1, 0); - sync(); - } -} - -static void halt_signal(int sig) -{ - shutdown_system(); - message(CONSOLE|LOG, - "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 (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0)) - init_reboot(RB_POWER_OFF); - else - init_reboot(RB_HALT_SYSTEM); - - loop_forever(); -} - -static void reboot_signal(int sig) -{ - shutdown_system(); - message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n"); - sync(); - - /* allow time for last message to reach serial console */ - sleep(2); - - init_reboot(RB_AUTOBOOT); - - loop_forever(); -} - -static void ctrlaltdel_signal(int sig) -{ - run_actions(CTRLALTDEL); -} - -#endif /* ! DEBUG_INIT */ - -static void new_initAction(initActionEnum action, char *process, char *cons) -{ - initAction *newAction; -#ifdef BB_FEATURE_INIT_NORMAL_ORDER - initAction *a; -#endif - - 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; - if (strcmp(cons, "/dev/null") == 0 && action == ASKFIRST) - return; - - newAction = calloc((size_t) (1), sizeof(initAction)); - if (!newAction) { - message(LOG | CONSOLE, "Memory allocation failure\n"); - loop_forever(); - } -#ifdef BB_FEATURE_INIT_NORMAL_ORDER - for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ; - if (a) { - a->nextPtr = newAction; - } else { - initActionList = newAction; - } -#else - newAction->nextPtr = initActionList; - initActionList = newAction; -#endif - 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); -} - -static 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. - * */ -static void parse_inittab(void) -{ -#ifdef BB_FEATURE_USE_INITTAB - FILE *file; - char buf[256], lineAsRead[256], tmpConsole[256]; - char *id, *runlev, *action, *process, *eol; - const struct initActionType *a = actions; - int foundIt; - - - file = fopen(INITTAB, "r"); - if (file == NULL) { - /* No inittab file -- set up some default behavior */ -#endif - /* Reboot on Ctrl-Alt-Del */ - new_initAction(CTRLALTDEL, "/sbin/reboot", console); -#ifdef BB_FEATURE_INIT_NORMAL_ORDER - /* Umount all filesystems on halt/reboot */ - new_initAction(SHUTDOWN, "/bin/umount -a -r", console); - /* Swapoff on halt/reboot */ - new_initAction(SHUTDOWN, "/sbin/swapoff -a", console); -#else - /* Swapoff on halt/reboot */ - new_initAction(SHUTDOWN, "/sbin/swapoff -a", console); - /* Umount all filesystems on halt/reboot */ - new_initAction(SHUTDOWN, "/bin/umount -a -r", console); -#endif - /* Askfirst shell on tty1 */ - new_initAction(ASKFIRST, LOGIN_SHELL, console); - /* Askfirst shell on tty2 */ - if (secondConsole != NULL) - new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole); - /* Askfirst shell on tty3 */ - if (thirdConsole != NULL) - new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole); - /* Askfirst shell on tty4 */ - if (fourthConsole != NULL) - new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole); - /* sysinit */ - new_initAction(SYSINIT, INIT_SCRIPT, console); - - return; -#ifdef BB_FEATURE_USE_INITTAB - } - - while (fgets(buf, 255, file) != NULL) { - foundIt = FALSE; - /* Skip leading spaces */ - for (id = buf; *id == ' ' || *id == '\t'; id++); - - /* Skip the line if it's a comment */ - if (*id == '#' || *id == '\n') - continue; - - /* Trim the trailing \n */ - eol = strrchr(id, '\n'); - if (eol != NULL) - *eol = '\0'; - - /* Keep a copy around for posterity's sake (and error msgs) */ - strcpy(lineAsRead, buf); - - /* Separate the ID field from the runlevels */ - runlev = strchr(id, ':'); - if (runlev == NULL || *(runlev + 1) == '\0') { - message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); - continue; - } else { - *runlev = '\0'; - ++runlev; - } - - /* Separate the runlevels from the action */ - action = strchr(runlev, ':'); - if (action == NULL || *(action + 1) == '\0') { - message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); - continue; - } else { - *action = '\0'; - ++action; - } - - /* Separate the action from the process */ - process = strchr(action, ':'); - if (process == NULL || *(process + 1) == '\0') { - message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); - continue; - } else { - *process = '\0'; - ++process; - } - - /* Ok, now process it */ - a = actions; - while (a->name != 0) { - if (strcmp(a->name, action) == 0) { - if (*id != '\0') { - strcpy(tmpConsole, "/dev/"); - strncat(tmpConsole, id, 200); - id = tmpConsole; - } - new_initAction(a->action, process, id); - foundIt = TRUE; - } - a++; - } - if (foundIt == TRUE) - continue; - else { - /* Choke on an unknown action */ - message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead); - } - } - return; -#endif /* BB_FEATURE_USE_INITTAB */ -} - - - -extern int init_main(int argc, char **argv) -{ - initAction *a, *tmp; - pid_t wpid; - int status; - -#ifndef DEBUG_INIT - /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ - if (getpid() != 1 -#ifdef BB_FEATURE_LINUXRC - && strstr(applet_name, "linuxrc") == NULL -#endif - ) - { - show_usage(); - } - /* Set up sig handlers -- be sure to - * clear all of these in run() */ - signal(SIGUSR1, halt_signal); - signal(SIGUSR2, halt_signal); - signal(SIGINT, ctrlaltdel_signal); - signal(SIGTERM, reboot_signal); - - /* Turn off rebooting via CTL-ALT-DEL -- we get a - * SIGINT on CAD so we can shut things down gracefully... */ - init_reboot(RB_DISABLE_CAD); -#endif - - /* Figure out what kernel this is running */ - kernelVersion = get_kernel_revision(); - - /* 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); - chdir("/"); - setsid(); - - /* Make sure PATH is set to something sane */ - putenv("PATH="_PATH_STDPATH); - - /* Hello world */ -#ifndef DEBUG_INIT - message( -#if ! defined BB_FEATURE_EXTRA_QUIET - CONSOLE| -#endif - LOG, - "init started: %s\r\n", full_version); -#else - message( -#if ! defined BB_FEATURE_EXTRA_QUIET - CONSOLE| -#endif - LOG, - "init(%d) started: %s\r\n", getpid(), full_version); -#endif - - - /* 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 tty2-4 */ - if (secondConsole != NULL) - new_initAction(ASKFIRST, LOGIN_SHELL, secondConsole); - if (thirdConsole != NULL) - new_initAction(ASKFIRST, LOGIN_SHELL, thirdConsole); - if (fourthConsole != NULL) - new_initAction(ASKFIRST, LOGIN_SHELL, fourthConsole); - /* Start a shell on tty1 */ - new_initAction(RESPAWN, LOGIN_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(); - } - - /* Make the command line just say "init" -- thats all, nothing else */ - fixup_argv(argc, argv, "init"); - - /* Now run everything that needs to be run */ - - /* First run the sysinit command */ - run_actions(SYSINIT); - /* Next run anything that wants to block */ - run_actions(WAIT); - /* Next run anything to be run only once */ - for (a = initActionList; a; a = tmp) { - tmp = 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"); - loop_forever(); - } - - /* 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); - } -} - -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/ |