/*
* Mini init implementation for busybox
*
- *
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-/* Turn this on to disable all the dangerous
- rebooting stuff when debugging.
-#define DEBUG_INIT
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
+#include "busybox.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"
+#include <sys/reboot.h>
+
+#include "init_shared.h"
+
#ifdef CONFIG_SYSLOGD
# include <sys/syslog.h>
#endif
+#define INIT_BUFFS_SIZE 256
/* 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 */
+ 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 */
+enum { 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];
+ int type;
+ int line;
+ unsigned int port;
+ int irq;
+ int flags;
+ int xmit_fifo_size;
+ int custom_divisor;
+ int baud_base;
+ unsigned short close_delay;
+ char io_type;
+ char reserved_char[1];
+ int hub6;
+ unsigned short closing_wait; /* time to wait before closing */
+ unsigned short closing_wait2; /* no longer used... */
+ unsigned char *iomem_base;
+ unsigned short iomem_reg_shift;
+ unsigned int port_high;
+ unsigned long iomap_base; /* cookie passed into ioremap */
+ int reserved[1];
};
-
-#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 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
-
#ifndef _PATH_STDPATH
#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
#endif
-
#if defined CONFIG_FEATURE_INIT_COREDUMPS
/*
- * When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
+ * 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 */
+#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef INIT_SCRIPT
-#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit 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;
-#if defined BB_FEATURE_EXTRA_QUIET
-static const int MAYBE_CONSOLE = 0x0;
-#else
-#define MAYBE_CONSOLE CONSOLE
-#endif
+#define CONSOLE_BUFF_SIZE 32
/* Allowed init action types */
-typedef enum {
- SYSINIT = 1,
- RESPAWN,
- ASKFIRST,
- WAIT,
- ONCE,
- CTRLALTDEL,
- SHUTDOWN
-} initActionEnum;
+#define SYSINIT 0x001
+#define RESPAWN 0x002
+#define ASKFIRST 0x004
+#define WAIT 0x008
+#define ONCE 0x010
+#define CTRLALTDEL 0x020
+#define SHUTDOWN 0x040
+#define RESTART 0x080
/* A mapping between "inittab" action name strings and action type codes. */
-typedef struct initActionType {
+struct init_action_type {
const char *name;
- initActionEnum action;
-} initActionType;
+ int action;
+};
-static const struct initActionType actions[] = {
+static const struct init_action_type actions[] = {
{"sysinit", SYSINIT},
{"respawn", RESPAWN},
{"askfirst", ASKFIRST},
{"once", ONCE},
{"ctrlaltdel", CTRLALTDEL},
{"shutdown", SHUTDOWN},
+ {"restart", RESTART},
{0, 0}
};
-/* Set up a linked list of initActions, to be read from inittab */
-typedef struct initActionTag initAction;
-struct initActionTag {
+/* Set up a linked list of init_actions, to be read from inittab */
+struct init_action {
pid_t pid;
- char process[256];
- char console[256];
- initAction *nextPtr;
- initActionEnum action;
+ char command[INIT_BUFFS_SIZE];
+ char terminal[CONSOLE_BUFF_SIZE];
+ struct init_action *next;
+ int action;
};
-static initAction *initActionList = NULL;
+/* Static variables */
+static struct init_action *init_action_list = NULL;
+static char console[CONSOLE_BUFF_SIZE] = CONSOLE_DEV;
+
+#ifndef CONFIG_SYSLOGD
+static char *log_console = VC_5;
+#endif
+#if !ENABLE_DEBUG_INIT
+static sig_atomic_t got_cont = 0;
+#endif
+
+enum {
+ LOG = 0x1,
+ CONSOLE = 0x2,
+
+#if defined CONFIG_FEATURE_EXTRA_QUIET
+ MAYBE_CONSOLE = 0x0,
+#else
+ MAYBE_CONSOLE = CONSOLE,
+#endif
+
+#ifndef RB_HALT_SYSTEM
+ RB_HALT_SYSTEM = 0xcdef0123, /* FIXME: this overflows enum */
+ RB_ENABLE_CAD = 0x89abcdef,
+ RB_DISABLE_CAD = 0,
+ RB_POWER_OFF = 0x4321fedc,
+ RB_AUTOBOOT = 0x01234567,
+#endif
+};
-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 const char * const environment[] = {
+ "HOME=/",
+ "PATH=" _PATH_STDPATH,
+ "SHELL=/bin/sh",
+ "USER=root",
+ NULL
+};
-static void delete_initAction(initAction * action);
+/* Function prototypes */
+static void delete_init_action(struct init_action *a);
+static int waitfor(const struct init_action *a, pid_t pid);
+#if !ENABLE_DEBUG_INIT
+static void shutdown_signal(int sig);
+#endif
static void loop_forever(void)
{
while (1)
- sleep (1);
+ sleep(1);
}
/* Print a message to the specified device.
* Device may be bitwise-or'd from LOG | CONSOLE */
-#ifdef DEBUG_INIT
-static inline messageND(int device, char *fmt, ...) { }
-#else
-#define messageND message
+#if ENABLE_DEBUG_INIT
+#define messageD message
+#else
+static inline void messageD(int ATTRIBUTE_UNUSED device,
+ const char ATTRIBUTE_UNUSED *fmt, ...)
+{
+}
#endif
-static void message(int device, char *fmt, ...)
- __attribute__ ((format (printf, 2, 3)));
-static void message(int device, char *fmt, ...)
+static void message(int device, const char *fmt, ...)
+ __attribute__ ((format(printf, 2, 3)));
+static void message(int device, const char *fmt, ...)
{
va_list arguments;
- int fd;
+ int l;
+ RESERVE_CONFIG_BUFFER(msg, 1024);
+#ifndef CONFIG_SYSLOGD
+ static int log_fd = -1;
+#endif
-#ifdef CONFIG_SYSLOGD
+ msg[0] = '\r';
+ va_start(arguments, fmt);
+ l = vsnprintf(msg + 1, 1024 - 2, fmt, arguments) + 1;
+ va_end(arguments);
+#ifdef CONFIG_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);
+ /* don`t out "\r\n" */
+ openlog(bb_applet_name, 0, LOG_DAEMON);
+ syslog(LOG_INFO, "%s", msg + 1);
+ closelog();
}
+
+ msg[l++] = '\n';
+ msg[l] = 0;
#else
- static int log_fd = -1;
+ msg[l++] = '\n';
+ msg[l] = 0;
/* 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) {
+ if ((log_fd = device_open(log_console, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {
log_fd = -2;
- fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
- log = NULL;
+ bb_error_msg("Bummer, can't write to log on %s!", log_console);
device = CONSOLE;
+ } else {
+ fcntl(log_fd, F_SETFD, FD_CLOEXEC);
}
}
if ((device & LOG) && (log_fd >= 0)) {
- va_start(arguments, fmt);
- vdprintf(log_fd, fmt, arguments);
- va_end(arguments);
+ full_write(log_fd, msg, l);
}
#endif
if (device & CONSOLE) {
+ int fd = device_open(CONSOLE_DEV,
+ O_WRONLY | O_NOCTTY | O_NONBLOCK);
/* 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);
+ if (fd >= 0) {
+ full_write(fd, msg, l);
close(fd);
+#if ENABLE_DEBUG_INIT
+ /* all descriptors may be closed */
} else {
- fprintf(stderr, "Bummer, can't print: ");
+ bb_error_msg("Bummer, can't print: ");
va_start(arguments, fmt);
vfprintf(stderr, fmt, arguments);
va_end(arguments);
+#endif
}
}
+ RELEASE_CONFIG_BUFFER(msg);
}
/* Set terminal settings to reasonable defaults */
-static void set_term(int fd)
+static void set_term(void)
{
struct termios tty;
- tcgetattr(fd, &tty);
+ tcgetattr(STDIN_FILENO, &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[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 */
+ 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;
+ tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
+ tty.c_cflag |= CREAD | HUPCL | CLOCAL;
/* input 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;
+ tcsetattr(STDIN_FILENO, TCSANOW, &tty);
}
static void console_init(void)
{
int fd;
- int tried_devcons = 0;
- int tried_vtprimary = 0;
+ int tried = 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) {
+ if ((s = getenv("CONSOLE")) != NULL || (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 {
+ } 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 */
/* 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++;
+ safe_strncpy(console, CONSOLE_DEV, sizeof(console));
+ tried++;
}
}
- 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;
+ while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0 && tried < 2) {
+ /* Can't open selected console -- try
+ logical system console and VT_MASTER */
+ safe_strncpy(console, (tried == 0 ? CONSOLE_DEV : CURRENT_VC),
+ sizeof(console));
+ tried++;
}
if (fd < 0) {
/* Perhaps we should panic here? */
- safe_strncpy(console, "/dev/null", sizeof(console));
+#ifndef CONFIG_SYSLOGD
+ log_console =
+#endif
+ safe_strncpy(console, bb_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;
+ s = getenv("TERM");
+ /* check for serial console */
+ if (ioctl(fd, TIOCGSERIAL, &sr) == 0) {
/* 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.\n");
+ * if TERM is set to linux (the default) */
+ if (s == NULL || strcmp(s, "linux") == 0)
+ putenv("TERM=vt102");
+#ifndef CONFIG_SYSLOGD
+ log_console = console;
+#endif
+ } else {
+ if (s == NULL)
+ putenv("TERM=linux");
}
close(fd);
}
- message(LOG, "console=%s\n", console);
+ messageD(LOG, "console=%s", 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);
}
}
+/* Open the new terminal device */
+static void open_new_terminal(const char * const device, const int fail) {
+ struct stat sb;
+
+ if ((device_open(device, O_RDWR)) < 0) {
+ if (stat(device, &sb) != 0) {
+ message(LOG | CONSOLE, "device '%s' does not exist.", device);
+ } else {
+ message(LOG | CONSOLE, "Bummer, can't open %s", device);
+ }
+ if (fail)
+ _exit(1);
+ /* else */
+#if !ENABLE_DEBUG_INIT
+ shutdown_signal(SIGUSR1);
+#else
+ _exit(2);
+#endif
+ }
+}
-static pid_t run(char *command, char *terminal, int get_enter)
+static pid_t run(const struct init_action *a)
{
- int i, j;
- int fd;
+ int i;
pid_t pid;
- char *tmpCmd, *s;
- char *cmd[255], *cmdpath;
- char buf[255];
- struct stat sb;
+ char *s, *tmpCmd, *cmd[INIT_BUFFS_SIZE], *cmdpath;
+ char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
+ sigset_t nmask, omask;
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=" _PATH_STDPATH,
- "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 !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
- if ((pid = fork()) == 0)
-#else
- if ((pid = vfork()) == 0)
-#endif
- {
+ /* Block sigchild while forking. */
+ sigemptyset(&nmask);
+ sigaddset(&nmask, SIGCHLD);
+ sigprocmask(SIG_BLOCK, &nmask, &omask);
+
+ if ((pid = fork()) == 0) {
+
/* Clean up */
- ioctl(0, TIOCNOTTY, 0);
close(0);
close(1);
close(2);
- setsid();
+ sigprocmask(SIG_SETMASK, &omask, NULL);
- /* Reset signal handlers set for parent process */
+ /* Reset signal handlers that were set by the parent process */
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGHUP, SIG_DFL);
+ signal(SIGQUIT, SIG_DFL);
+ signal(SIGCONT, SIG_DFL);
+ signal(SIGSTOP, SIG_DFL);
+ signal(SIGTSTP, SIG_DFL);
+
+ /* Create a new session and make ourself the process
+ * group leader */
+ setsid();
+
+ /* Open the new terminal device */
+ open_new_terminal(a->terminal, 1);
- 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);
+ /* Make sure the terminal will act fairly normal for us */
+ set_term();
+ /* Setup stdout, stderr for the new process so
+ * they point to the supplied terminal */
+ dup(0);
+ dup(0);
+
+ /* If the init Action requires us to wait, then force the
+ * supplied terminal to be the controlling tty. */
+ if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
+
+ /* Now fork off another process to just hang around */
+ if ((pid = fork()) < 0) {
+ message(LOG | CONSOLE, "Can't fork!");
+ _exit(1);
}
- message(LOG | CONSOLE, "Bummer, can't open %s\n", terminal);
- exit(1);
+
+ if (pid > 0) {
+
+ /* We are the parent -- wait till the child is done */
+ signal(SIGINT, SIG_IGN);
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGCHLD, SIG_DFL);
+
+ waitfor(NULL, pid);
+ /* See if stealing the controlling tty back is necessary */
+ if (tcgetpgrp(0) != getpid())
+ _exit(0);
+
+ /* Use a temporary process to steal the controlling tty. */
+ if ((pid = fork()) < 0) {
+ message(LOG | CONSOLE, "Can't fork!");
+ _exit(1);
+ }
+ if (pid == 0) {
+ setsid();
+ ioctl(0, TIOCSCTTY, 1);
+ _exit(0);
+ }
+ waitfor(NULL, pid);
+ _exit(0);
+ }
+
+ /* Now fall though to actually execute things */
}
- 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, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
- cmd[0] = SHELL;
+ if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
+ cmd[0] = (char *)DEFAULT_SHELL;
cmd[1] = "-c";
- strcpy(buf, "exec ");
- safe_strncpy(buf + sizeof("exec "), command,
- sizeof(buf) - sizeof("exec "));
- cmd[2] = buf;
+ cmd[2] = strcat(strcpy(buf, "exec "), a->command);
cmd[3] = NULL;
} else {
/* Convert command (char*) into cmd (char**, one word per string) */
- safe_strncpy(buf, command, sizeof(buf));
+ strcpy(buf, a->command);
s = buf;
- for (tmpCmd = buf, i = 0;
- (tmpCmd = strsep(&s, " \t")) != NULL;) {
+ for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
if (*tmpCmd != '\0') {
cmd[i] = tmpCmd;
- tmpCmd++;
i++;
}
}
/*
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
+ 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").
*/
++cmdpath;
/* find the last component in the command pathname */
- s = get_last_path_component(cmdpath);
+ s = bb_get_last_path_component(cmdpath);
/* make a new argv[0] */
- if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
- message(LOG | CONSOLE, "malloc failed");
+ if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
+ message(LOG | CONSOLE, bb_msg_memory_exhausted);
cmd[0] = cmdpath;
} else {
cmd[0][0] = '-';
- strcpy(cmd[0]+1, s);
+ strcpy(cmd[0] + 1, s);
}
+#ifdef CONFIG_FEATURE_INIT_SCTTY
+ /* Establish this process as session leader and
+ * (attempt) to make the tty (if any) a controlling tty.
+ */
+ (void) setsid();
+ (void) ioctl(0, TIOCSCTTY, 0/*don't steal it*/);
+#endif
}
- if (get_enter == TRUE) {
+#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
+ if (a->action & ASKFIRST) {
+ char c;
/*
* 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
+ * be allowed to start a shell or whatever an init script
* specifies.
*/
- messageND(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\n",
- cmd[0], getpid(), terminal);
- write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
- getc(stdin);
+ messageD(LOG, "Waiting for enter to start '%s'"
+ "(pid %d, terminal %s)\n",
+ cmdpath, getpid(), a->terminal);
+ full_write(1, press_enter, sizeof(press_enter) - 1);
+ while(read(0, &c, 1) == 1 && c != '\n')
+ ;
}
+#endif
/* Log the process name and args */
- messageND(LOG, "Starting pid %d, console %s: '%s'\n",
- getpid(), terminal, command);
+ message(LOG, "Starting pid %d, console %s: '%s'",
+ getpid(), a->terminal, cmdpath);
#if defined CONFIG_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);
+ {
+ 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,
+ /* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
- execve(cmdpath, cmd, environment);
+ execv(cmdpath, cmd);
/* We're still here? Some error happened. */
- message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
- strerror(errno));
- exit(-1);
+ message(LOG | CONSOLE, "Bummer, could not run '%s': %m", cmdpath);
+ _exit(-1);
}
+ sigprocmask(SIG_SETMASK, &omask, NULL);
return pid;
}
-static int waitfor(char *command, char *terminal, int get_enter)
+static int waitfor(const struct init_action *a, pid_t pid)
{
+ int runpid;
int status, wpid;
- int pid = run(command, terminal, get_enter);
+ runpid = (NULL == a)? pid : run(a);
while (1) {
- wpid = wait(&status);
- if (wpid > 0 && wpid != pid) {
- continue;
- }
- if (wpid == pid)
+ wpid = waitpid(runpid,&status,0);
+ if (wpid == runpid)
break;
+ if (wpid == -1 && errno == ECHILD) {
+ /* we missed its termination */
+ break;
+ }
+ /* FIXME other errors should maybe trigger an error, but allow
+ * the program to continue */
}
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)
+/* Run all commands of a particular type */
+static void run_actions(int action)
{
- struct stat statBuf;
-
- if (check_free_memory() > 1000)
- return;
-
-#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
- 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;
-#endif
+ struct init_action *a, *tmp;
- goodnight:
- message(CONSOLE,
- "Sorry, your computer does not have enough memory.\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;
+ for (a = init_action_list; a; a = tmp) {
+ tmp = a->next;
if (a->action == action) {
- waitfor(a->process, a->console, FALSE);
- delete_initAction(a);
+ if (access(a->terminal, R_OK | W_OK)) {
+ delete_init_action(a);
+ } else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
+ waitfor(a, 0);
+ delete_init_action(a);
+ } else if (a->action & ONCE) {
+ run(a);
+ delete_init_action(a);
+ } else if (a->action & (RESPAWN | ASKFIRST)) {
+ /* Only run stuff with pid==0. If they have
+ * a pid, that means it is still running */
+ if (a->pid == 0) {
+ a->pid = run(a);
+ }
+ }
}
}
}
+#if !ENABLE_DEBUG_INIT
+static void init_reboot(unsigned long magic)
+{
+ pid_t pid;
+ /* We have to fork here, since the kernel calls do_exit(0) in
+ * linux/kernel/sys.c, which can cause the machine to panic when
+ * the init process is killed.... */
+ if ((pid = fork()) == 0) {
+ reboot(magic);
+ _exit(0);
+ }
+ waitpid (pid, NULL, 0);
+}
-#ifndef DEBUG_INIT
static void shutdown_system(void)
{
sigset_t block_signals;
+ /* run everything to be run at "shutdown". This is done _prior_
+ * to killing everything, in case people wish to use scripts to
+ * shut things down gracefully... */
+ run_actions(SHUTDOWN);
+
/* first disable all our signals */
sigemptyset(&block_signals);
sigaddset(&block_signals, SIGHUP);
+ sigaddset(&block_signals, SIGQUIT);
sigaddset(&block_signals, SIGCHLD);
sigaddset(&block_signals, SIGUSR1);
sigaddset(&block_signals, SIGUSR2);
sigaddset(&block_signals, SIGINT);
sigaddset(&block_signals, SIGTERM);
+ sigaddset(&block_signals, SIGCONT);
+ sigaddset(&block_signals, SIGSTOP);
+ sigaddset(&block_signals, SIGTSTP);
sigprocmask(SIG_BLOCK, &block_signals, NULL);
/* Allow Ctrl-Alt-Del to reboot system. */
init_reboot(RB_ENABLE_CAD);
- message(CONSOLE|LOG, "\nThe system is going down NOW !!\n");
+ message(CONSOLE | LOG, "The system is going down NOW !!");
sync();
/* Send signals to every process _except_ pid 1 */
- message(CONSOLE|LOG, "Sending SIGTERM to all processes.\n");
+ message(CONSOLE | LOG, init_sending_format, "TERM");
kill(-1, SIGTERM);
sleep(1);
sync();
- message(CONSOLE|LOG, "Sending SIGKILL to all processes.\n");
+ message(CONSOLE | LOG, init_sending_format, "KILL");
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 exec_signal(int sig ATTRIBUTE_UNUSED)
+{
+ struct init_action *a, *tmp;
+ sigset_t unblock_signals;
+
+ for (a = init_action_list; a; a = tmp) {
+ tmp = a->next;
+ if (a->action & RESTART) {
+ shutdown_system();
+
+ /* unblock all signals, blocked in shutdown_system() */
+ sigemptyset(&unblock_signals);
+ sigaddset(&unblock_signals, SIGHUP);
+ sigaddset(&unblock_signals, SIGQUIT);
+ sigaddset(&unblock_signals, SIGCHLD);
+ sigaddset(&unblock_signals, SIGUSR1);
+ sigaddset(&unblock_signals, SIGUSR2);
+ sigaddset(&unblock_signals, SIGINT);
+ sigaddset(&unblock_signals, SIGTERM);
+ sigaddset(&unblock_signals, SIGCONT);
+ sigaddset(&unblock_signals, SIGSTOP);
+ sigaddset(&unblock_signals, SIGTSTP);
+ sigprocmask(SIG_UNBLOCK, &unblock_signals, NULL);
+
+ /* Close whatever files are open. */
+ close(0);
+ close(1);
+ close(2);
+
+ /* Open the new terminal device */
+ open_new_terminal(a->terminal, 0);
+
+ /* Make sure the terminal will act fairly normal for us */
+ set_term();
+ /* Setup stdout, stderr on the supplied terminal */
+ dup(0);
+ dup(0);
+
+ messageD(CONSOLE | LOG, "Trying to re-exec %s", a->command);
+ execl(a->command, a->command, NULL);
+
+ message(CONSOLE | LOG, "exec of '%s' failed: %m",
+ a->command);
+ sync();
+ sleep(2);
+ init_reboot(RB_HALT_SYSTEM);
+ loop_forever();
+ }
}
}
-static void halt_signal(int sig)
+static void shutdown_signal(int sig)
{
+ char *m;
+ int rb;
+
shutdown_system();
- message(CONSOLE|LOG,
-#if #cpu(s390)
- /* Seems the s390 console is Wierd(tm). */
- "The system is halted. You may reboot now.\n"
-#else
- /* secondConsole is NULL for a serial console */
- "The system is halted. Press %s or turn off power\n",
- (secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
-#endif
- );
+
+ if (sig == SIGTERM) {
+ m = "reboot";
+ rb = RB_AUTOBOOT;
+ } else if (sig == SIGUSR2) {
+ m = "poweroff";
+ rb = RB_POWER_OFF;
+ } else {
+ m = "halt";
+ rb = RB_HALT_SYSTEM;
+ }
+ message(CONSOLE | LOG, "Requesting system %s.", m);
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);
+ init_reboot(rb);
loop_forever();
}
-static void reboot_signal(int sig)
+static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
{
- shutdown_system();
- message(CONSOLE|LOG, "Please stand by while rebooting the system.\n");
- sync();
-
- /* allow time for last message to reach serial console */
- sleep(2);
+ run_actions(CTRLALTDEL);
+}
- init_reboot(RB_AUTOBOOT);
+/* The SIGSTOP & SIGTSTP handler */
+static void stop_handler(int sig ATTRIBUTE_UNUSED)
+{
+ int saved_errno = errno;
- loop_forever();
+ got_cont = 0;
+ while (!got_cont)
+ pause();
+ got_cont = 0;
+ errno = saved_errno;
}
-static void ctrlaltdel_signal(int sig)
+/* The SIGCONT handler */
+static void cont_handler(int sig ATTRIBUTE_UNUSED)
{
- run_actions(CTRLALTDEL);
+ got_cont = 1;
}
-#endif /* ! DEBUG_INIT */
+#endif /* ! ENABLE_DEBUG_INIT */
-static void new_initAction(initActionEnum action, char *process, char *cons)
+static void new_init_action(int action, const char *command, const char *cons)
{
- initAction *newAction;
- initAction *a;
+ struct init_action *new_action, *a, *last;
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)
+ if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
return;
- newAction = calloc((size_t) (1), sizeof(initAction));
- if (!newAction) {
- message(LOG | CONSOLE, "Memory allocation failure\n");
+ new_action = calloc((size_t) (1), sizeof(struct init_action));
+ if (!new_action) {
+ message(LOG | CONSOLE, "Memory allocation failure");
loop_forever();
}
- for (a = initActionList; a && a->nextPtr; a = a->nextPtr) ;
- if (a) {
- a->nextPtr = newAction;
+
+ /* Append to the end of the list */
+ for (a = last = init_action_list; a; a = a->next) {
+ /* don't enter action if it's already in the list,
+ * but do overwrite existing actions */
+ if ((strcmp(a->command, command) == 0) &&
+ (strcmp(a->terminal, cons) ==0)) {
+ a->action = action;
+ free(new_action);
+ return;
+ }
+ last = a;
+ }
+ if (last) {
+ last->next = new_action;
} else {
- initActionList = newAction;
+ init_action_list = new_action;
}
- safe_strncpy(newAction->process, process, 255);
- newAction->action = action;
- safe_strncpy(newAction->console, cons, 255);
- newAction->pid = 0;
-// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
-// newAction->process, newAction->action, newAction->console);
+ strcpy(new_action->command, command);
+ new_action->action = action;
+ strcpy(new_action->terminal, cons);
+ messageD(LOG|CONSOLE, "command='%s' action='%d' terminal='%s'\n",
+ new_action->command, new_action->action, new_action->terminal);
}
-static void delete_initAction(initAction * action)
+static void delete_init_action(struct init_action *action)
{
- initAction *a, *b = NULL;
+ struct init_action *a, *b = NULL;
- for (a = initActionList; a; b = a, a = a->nextPtr) {
+ for (a = init_action_list; a; b = a, a = a->next) {
if (a == action) {
if (b == NULL) {
- initActionList = a->nextPtr;
+ init_action_list = a->next;
} else {
- b->nextPtr = a->nextPtr;
+ b->next = a->next;
}
free(a);
break;
/* NOTE that if CONFIG_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 CONFIG_FEATURE_USE_INITTAB
- * _is_ defined, but /etc/inittab is missing, this
+ * actions(i.e., runs INIT_SCRIPT and then starts a pair
+ * of "askfirst" shells). If CONFIG_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 CONFIG_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;
+ char buf[INIT_BUFFS_SIZE], lineAsRead[INIT_BUFFS_SIZE];
+ char tmpConsole[CONSOLE_BUFF_SIZE];
+ char *id, *runlev, *action, *command, *eol;
+ const struct init_action_type *a = actions;
file = fopen(INITTAB, "r");
/* No inittab file -- set up some default behavior */
#endif
/* Reboot on Ctrl-Alt-Del */
- new_initAction(CTRLALTDEL, "/sbin/reboot", console);
+ new_init_action(CTRLALTDEL, "/sbin/reboot", "");
/* Umount all filesystems on halt/reboot */
- new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
-#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
+ new_init_action(SHUTDOWN, "/bin/umount -a -r", "");
/* Swapoff on halt/reboot */
- new_initAction(SHUTDOWN, "/sbin/swapoff -a", 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);
+ if(ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "/sbin/swapoff -a", "");
+ /* Prepare to restart init when a HUP is received */
+ new_init_action(RESTART, "/sbin/init", "");
+ /* Askfirst shell on tty1-4 */
+ new_init_action(ASKFIRST, bb_default_login_shell, "");
+ new_init_action(ASKFIRST, bb_default_login_shell, VC_2);
+ new_init_action(ASKFIRST, bb_default_login_shell, VC_3);
+ new_init_action(ASKFIRST, bb_default_login_shell, VC_4);
/* sysinit */
- new_initAction(SYSINIT, INIT_SCRIPT, console);
+ new_init_action(SYSINIT, INIT_SCRIPT, "");
return;
#ifdef CONFIG_FEATURE_USE_INITTAB
}
- while (fgets(buf, 255, file) != NULL) {
- foundIt = FALSE;
+ while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
/* Skip leading spaces */
for (id = buf; *id == ' ' || *id == '\t'; id++);
/* 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);
+ message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);
continue;
} else {
*runlev = '\0';
/* Separate the runlevels from the action */
action = strchr(runlev, ':');
if (action == NULL || *(action + 1) == '\0') {
- message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
+ message(LOG | CONSOLE, "Bad inittab entry: %s", 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);
+ /* Separate the action from the command */
+ command = strchr(action, ':');
+ if (command == NULL || *(command + 1) == '\0') {
+ message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);
continue;
} else {
- *process = '\0';
- ++process;
+ *command = '\0';
+ ++command;
}
/* Ok, now process it */
- a = actions;
- while (a->name != 0) {
+ for (a = actions; a->name != 0; a++) {
if (strcmp(a->name, action) == 0) {
if (*id != '\0') {
+ if(strncmp(id, "/dev/", 5) == 0)
+ id += 5;
strcpy(tmpConsole, "/dev/");
- strncat(tmpConsole, id, 200);
+ safe_strncpy(tmpConsole + 5, id,
+ CONSOLE_BUFF_SIZE - 5);
id = tmpConsole;
}
- new_initAction(a->action, process, id);
- foundIt = TRUE;
+ new_init_action(a->action, command, id);
+ break;
}
- a++;
}
- if (foundIt == TRUE)
- continue;
- else {
+ if (a->name == 0) {
/* Choke on an unknown action */
- message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
+ message(LOG | CONSOLE, "Bad inittab entry: %s", lineAsRead);
}
}
+ fclose(file);
return;
-#endif /* CONFIG_FEATURE_USE_INITTAB */
+#endif /* CONFIG_FEATURE_USE_INITTAB */
}
+#ifdef CONFIG_FEATURE_USE_INITTAB
+static void reload_signal(int sig ATTRIBUTE_UNUSED)
+{
+ struct init_action *a, *tmp;
+
+ message(LOG, "Reloading /etc/inittab");
+
+ /* disable old entrys */
+ for (a = init_action_list; a; a = a->next ) {
+ a->action = ONCE;
+ }
+
+ parse_inittab();
+ /* remove unused entrys */
+ for (a = init_action_list; a; a = tmp) {
+ tmp = a->next;
+ if (a->action & (ONCE | SYSINIT | WAIT ) &&
+ a->pid == 0 ) {
+ delete_init_action(a);
+ }
+ }
+ run_actions(RESPAWN);
+ return;
+}
+#endif /* CONFIG_FEATURE_USE_INITTAB */
-extern int init_main(int argc, char **argv)
+int init_main(int argc, char **argv)
{
- initAction *a, *tmp;
+ struct init_action *a;
pid_t wpid;
- int status;
-#ifndef DEBUG_INIT
+ if (argc > 1 && !strcmp(argv[1], "-q")) {
+ return kill(1,SIGHUP);
+ }
+#if !ENABLE_DEBUG_INIT
/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
- if (getpid() != 1
-#ifdef CONFIG_FEATURE_INITRD
- && strstr(applet_name, "linuxrc") == NULL
-#endif
- )
+ if (getpid() != 1 &&
+ (!ENABLE_FEATURE_INITRD || !strstr(bb_applet_name, "linuxrc")))
{
- show_usage();
+ bb_show_usage();
}
/* Set up sig handlers -- be sure to
* clear all of these in run() */
- signal(SIGUSR1, halt_signal);
- signal(SIGUSR2, halt_signal);
+ signal(SIGHUP, exec_signal);
+ signal(SIGQUIT, exec_signal);
+ signal(SIGUSR1, shutdown_signal);
+ signal(SIGUSR2, shutdown_signal);
signal(SIGINT, ctrlaltdel_signal);
- signal(SIGTERM, reboot_signal);
+ signal(SIGTERM, shutdown_signal);
+ signal(SIGCONT, cont_handler);
+ signal(SIGSTOP, stop_handler);
+ signal(SIGTSTP, stop_handler);
- /* Turn off rebooting via CTL-ALT-DEL -- we get a
+ /* 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);
- /* Figure out where the default console should be */
- console_init();
+ if (device_open(console, O_RDWR | O_NOCTTY) == 0) {
+ set_term();
+ close(0);
+ }
- set_term(0);
chdir("/");
setsid();
+ {
+ const char * const *e;
+ /* Make sure environs is set to something sane */
+ for(e = environment; *e; e++)
+ putenv((char *) *e);
+ }
- /* Make sure PATH is set to something sane */
- putenv("PATH="_PATH_STDPATH);
+ if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
/* Hello world */
- message(MAYBE_CONSOLE|LOG, "init started: %s\n", full_version);
+ message(MAYBE_CONSOLE | LOG, "init started: %s", bb_msg_full_version);
/* Make sure there is enough memory to do something useful. */
- check_memory();
+ if (ENABLE_SWAPONOFF) {
+ struct sysinfo info;
+
+ if (!sysinfo(&info) &&
+ (info.mem_unit ? : 1) * (long long)info.totalram < MEGABYTE)
+ {
+ message(CONSOLE,"Low memory: forcing swapon.");
+ /* swapon -a requires /proc typically */
+ new_init_action(SYSINIT, "/bin/mount -t proc proc /proc", "");
+ /* Try to turn on swap */
+ new_init_action(SYSINIT, "/sbin/swapon -a", "");
+ run_actions(SYSINIT); /* wait and removing */
+ }
+ }
/* 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);
+ /* Start a shell on console */
+ new_init_action(RESPAWN, bb_default_login_shell, "");
} else {
/* Not in single user mode -- see what inittab says */
/* NOTE that if CONFIG_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
+ * actions(i.e., runs INIT_SCRIPT and then starts a pair
* of "askfirst" shells */
parse_inittab();
}
+#ifdef CONFIG_SELINUX
+ if (getenv("SELINUX_INIT") == NULL) {
+ int enforce = 0;
+
+ putenv("SELINUX_INIT=YES");
+ if (selinux_init_load_policy(&enforce) == 0) {
+ execv(argv[0], argv);
+ } else if (enforce > 0) {
+ /* SELinux in enforcing mode but load_policy failed */
+ /* At this point, we probably can't open /dev/console, so log() won't work */
+ message(CONSOLE,"Unable to load SELinux Policy. Machine is in enforcing mode. Halting now.");
+ exit(1);
+ }
+ }
+#endif /* CONFIG_SELINUX */
+
/* Make the command line just say "init" -- thats all, nothing else */
fixup_argv(argc, argv, "init");
/* 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();
- }
+ run_actions(ONCE);
+
+#ifdef CONFIG_FEATURE_USE_INITTAB
+ /* Redefine SIGHUP to reread /etc/inittab */
+ signal(SIGHUP, reload_signal);
+#else
+ signal(SIGHUP, SIG_IGN);
+#endif /* CONFIG_FEATURE_USE_INITTAB */
+
/* 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;
- }
- }
- }
+ /* run the respawn stuff */
+ run_actions(RESPAWN);
+
+ /* run the askfirst stuff */
+ run_actions(ASKFIRST);
+
+ /* Don't consume all CPU time -- sleep a bit */
+ sleep(1);
+
/* Wait for a child process to exit */
- wpid = wait(&status);
- if (wpid > 0) {
+ wpid = wait(NULL);
+ while (wpid > 0) {
/* Find out who died and clean up their corpse */
- for (a = initActionList; a; a = a->nextPtr) {
+ for (a = init_action_list; a; a = a->next) {
if (a->pid == wpid) {
+ /* Set the pid to 0 so that the process gets
+ * restarted by run_actions() */
a->pid = 0;
- message(LOG, "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
- a->process, wpid);
+ message(LOG, "Process '%s' (pid %d) exited. "
+ "Scheduling it for restart.",
+ a->command, wpid);
}
}
+ /* see if anyone else is waiting to be reaped */
+ wpid = waitpid (-1, NULL, WNOHANG);
}
- sleep(1);
}
}
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff