| /* 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" |
| #define bb_need_full_version |
| #define BB_DECLARE_EXTERN |
| #include "messages.c" |
| #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; |
| #if defined(__GLIBC__) || defined (__UCLIBC__) |
| #include <sys/reboot.h> |
| #define init_reboot(magic) reboot(magic) |
| #else |
| #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic) |
| #endif |
| #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 defined(__GLIBC__) |
| #include <sys/kdaemon.h> |
| #else |
| #include <sys/syscall.h> |
| #include <linux/unistd.h> |
| static _syscall2(int, bdflush, int, func, int, data); |
| #endif /* __GLIBC__ */ |
| |
| |
| #define VT_PRIMARY "/dev/tty1" /* Primary virtual console */ |
| #define VT_SECONDARY "/dev/tty2" /* Virtual console */ |
| #define VT_THIRD "/dev/tty3" /* Virtual console */ |
| #define VT_FOURTH "/dev/tty4" /* Virtual console */ |
| #define VT_LOG "/dev/tty5" /* 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 |
| |
| 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 |
| } 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}, |
| {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; |
| }; |
| initAction *initActionList = NULL; |
| |
| |
| static char *secondConsole = VT_SECONDARY; |
| static char *thirdConsole = VT_THIRD; |
| static char *fourthConsole = VT_FOURTH; |
| static char *log = VT_LOG; |
| static int kernelVersion = 0; |
| static char termType[32] = "TERM=linux"; |
| static char console[32] = _PATH_CONSOLE; |
| |
| static void delete_initAction(initAction * action); |
| |
| |
| /* 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); |
| openlog(applet_name, 0, LOG_USER); |
| syslog(LOG_USER|LOG_INFO, 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 = -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 */ |
| 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 |= 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() |
| { |
| 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() |
| { |
| 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) { |
| 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 { |
| /* 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 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) |
| snprintf(termType, sizeof(termType) - 1, "TERM=vt102"); |
| message(LOG | CONSOLE, |
| "serial console detected. Disabling virtual terminals.\r\n"); |
| } |
| close(fd); |
| } |
| message(LOG, "console=%s\n", console); |
| } |
| |
| static pid_t run(char *command, char *terminal, int get_enter) |
| { |
| int i=0, j=0; |
| int fd; |
| pid_t pid; |
| char *tmpCmd; |
| char *cmd[255], *cmdpath; |
| char buf[255]; |
| static const char press_enter[] = |
| |
| #ifdef CUSTOMIZED_BANNER |
| #include CUSTOMIZED_BANNER |
| #endif |
| |
| "\nPlease press Enter to activate this console. "; |
| char *environment[MAXENV+1] = { |
| "HOME=/", |
| "PATH=/usr/bin:/bin:/usr/sbin:/sbin", |
| "SHELL=/bin/sh", |
| termType, |
| "USER=root" |
| }; |
| |
| while (environment[i]) i++; |
| while ((environ[j]) && (i < MAXENV)) { |
| if (strncmp(environ[j], "TERM=", 5)) |
| environment[i++] = environ[j]; |
| j++; |
| } |
| |
| 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) { |
| 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); |
| |
| 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", |
| command, 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 |
| |
| /* 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 == '-') { |
| char *s; |
| |
| /* 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 defined BB_FEATURE_INIT_COREDUMPS |
| { |
| struct stat sb; |
| 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() |
| { |
| 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"); |
| while (1) |
| sleep(1); |
| } |
| |
| /* Run all commands to be run right before halt/reboot */ |
| static void run_lastAction(void) |
| { |
| initAction *a; |
| for (a = initActionList; a; a = a->nextPtr) { |
| if (a->action == CTRLALTDEL) { |
| 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 "ctrlaltdel" */ |
| run_lastAction(); |
| |
| 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); |
| exit(0); |
| } |
| |
| 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); |
| exit(0); |
| } |
| |
| #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); |
| } |
| |
| 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. |
| * */ |
| 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 |
| /* Swapoff on halt/reboot */ |
| new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console); |
| /* Umount all filesystems on halt/reboot */ |
| new_initAction(CTRLALTDEL, "/bin/umount -a -r", console); |
| /* Askfirst shell on tty1 */ |
| new_initAction(ASKFIRST, SHELL, console); |
| /* Askfirst shell on tty2 */ |
| if (secondConsole != NULL) |
| new_initAction(ASKFIRST, SHELL, secondConsole); |
| /* Askfirst shell on tty3 */ |
| if (thirdConsole != NULL) |
| new_initAction(ASKFIRST, SHELL, thirdConsole); |
| /* Askfirst shell on tty4 */ |
| if (fourthConsole != NULL) |
| new_initAction(ASKFIRST, 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') { |
| struct stat statBuf; |
| |
| strcpy(tmpConsole, "/dev/"); |
| strncat(tmpConsole, id, 200); |
| if (stat(tmpConsole, &statBuf) != 0) { |
| message(LOG | CONSOLE, |
| "device '%s' does not exist. Did you read the directions?\n", |
| tmpConsole); |
| break; |
| } |
| 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; |
| 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, reboot_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_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, SHELL, secondConsole); |
| if (thirdConsole != NULL) |
| new_initAction(ASKFIRST, SHELL, thirdConsole); |
| if (fourthConsole != NULL) |
| new_initAction(ASKFIRST, SHELL, fourthConsole); |
| /* 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(); |
| } |
| |
| /* Fix up argv[0] to be certain we claim to be init */ |
| argv[0]="init"; |
| |
| if (argc > 1) |
| argv[1][0]=0; |
| |
| /* 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); |
| } |
| } |
| |
| /* |
| Local Variables: |
| c-file-style: "linux" |
| c-basic-offset: 4 |
| tab-width: 4 |
| End: |
| */ |