/*
* 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 <errno.h>
+#include "libbb.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 __GNU_LIBRARY__ > 5
- #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
+#include <sys/reboot.h>
+#include <sys/syslog.h>
+#define INIT_BUFFS_SIZE 256
+#define CONSOLE_NAME_SIZE 32
+#define MAXENV 16 /* Number of env. vars */
-#if defined BB_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 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 */
+#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;
-
/* 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 {
+#define SYSINIT 0x001
+#define RESPAWN 0x002
+#define ASKFIRST 0x004
+#define WAIT 0x008
+#define ONCE 0x010
+#define CTRLALTDEL 0x020
+#define SHUTDOWN 0x040
+#define RESTART 0x080
+
+#define STR_SYSINIT "\x01"
+#define STR_RESPAWN "\x02"
+#define STR_ASKFIRST "\x04"
+#define STR_WAIT "\x08"
+#define STR_ONCE "\x10"
+#define STR_CTRLALTDEL "\x20"
+#define STR_SHUTDOWN "\x40"
+#define STR_RESTART "\x80"
+
+/* Set up a linked list of init_actions, to be read from inittab */
+struct init_action {
+ struct init_action *next;
pid_t pid;
- char process[256];
- char console[256];
- initAction *nextPtr;
- initActionEnum action;
+ uint8_t action;
+ char terminal[CONSOLE_NAME_SIZE];
+ char command[INIT_BUFFS_SIZE];
};
-static initAction *initActionList = NULL;
+/* Static variables */
+static struct init_action *init_action_list = 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 const char *log_console = VC_5;
+static sig_atomic_t got_cont = 0;
-static void delete_initAction(initAction * action);
+enum {
+ L_LOG = 0x1,
+ L_CONSOLE = 0x2,
+#if ENABLE_FEATURE_EXTRA_QUIET
+ MAYBE_CONSOLE = 0x0,
+#else
+ MAYBE_CONSOLE = L_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
+};
-/* 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, ...)
+static const char *const environment[] = {
+ "HOME=/",
+ bb_PATH_root_path,
+ "SHELL=/bin/sh",
+ "USER=root",
+ NULL
+};
+
+/* Function prototypes */
+static void delete_init_action(struct init_action *a);
+static void halt_reboot_pwoff(int sig) ATTRIBUTE_NORETURN;
+
+static void waitfor(pid_t pid)
{
- va_list arguments;
- int fd;
+ /* waitfor(run(x)): protect against failed fork inside run() */
+ if (pid <= 0)
+ return;
-#ifdef BB_SYSLOGD
+ /* Wait for any child (prevent zombies from exiting orphaned processes)
+ * but exit the loop only when specified one has exited. */
+ while (wait(NULL) != pid)
+ continue;
+}
- /* Log the message to syslogd */
- if (device & LOG) {
- char msg[1024];
+static void loop_forever(void) ATTRIBUTE_NORETURN;
+static void loop_forever(void)
+{
+ while (1)
+ sleep(1);
+}
- 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
+/* Print a message to the specified device.
+ * Device may be bitwise-or'd from L_LOG | L_CONSOLE */
+#define messageD(...) do { if (ENABLE_DEBUG_INIT) message(__VA_ARGS__); } while (0)
+static void message(int device, const char *fmt, ...)
+ __attribute__ ((format(printf, 2, 3)));
+static void message(int device, const char *fmt, ...)
+{
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;
+ va_list arguments;
+ int l;
+ char msg[128];
+
+ msg[0] = '\r';
+ va_start(arguments, fmt);
+ vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments);
+ va_end(arguments);
+ msg[sizeof(msg) - 2] = '\0';
+ l = strlen(msg);
+
+ if (ENABLE_FEATURE_INIT_SYSLOG) {
+ /* Log the message to syslogd */
+ if (device & L_LOG) {
+ /* don't out "\r" */
+ openlog(applet_name, 0, LOG_DAEMON);
+ syslog(LOG_INFO, "init: %s", msg + 1);
+ closelog();
+ }
+ msg[l++] = '\n';
+ msg[l] = '\0';
+ } else {
+ 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_console) {
+ log_fd = 2;
+ } else {
+ log_fd = device_open(log_console, O_WRONLY | O_NONBLOCK | O_NOCTTY);
+ if (log_fd < 0) {
+ bb_error_msg("can't log to %s", log_console);
+ device = L_CONSOLE;
+ } else {
+ close_on_exec_on(log_fd);
+ }
+ }
+ }
+ if (device & L_LOG) {
+ full_write(log_fd, msg, l);
+ if (log_fd == 2)
+ return; /* don't print dup messages */
}
}
- if ((device & LOG) && (log_fd >= 0)) {
- va_start(arguments, fmt);
- vdprintf(log_fd, fmt, arguments);
- va_end(arguments);
+
+ if (device & L_CONSOLE) {
+ /* Send console messages to console so people will see them. */
+ full_write(2, msg, l);
}
-#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);
+/* From <linux/serial.h> */
+struct serial_struct {
+ 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];
+ /* Paranoia (imagine 64bit kernel overwriting 32bit userspace stack) */
+ uint32_t bbox_reserved[16];
+};
+static void console_init(void)
+{
+ struct serial_struct sr;
+ char *s;
+
+ s = getenv("CONSOLE");
+ if (!s) s = getenv("console");
+ if (s) {
+ int fd = open(s, O_RDWR | O_NONBLOCK | O_NOCTTY);
+ if (fd >= 0) {
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ while (fd > 2) close(fd--);
}
+ messageD(L_LOG, "console='%s'", s);
+ } else {
+ /* Make sure fd 0,1,2 are not closed */
+ bb_sanitize_stdio();
}
+
+ s = getenv("TERM");
+ if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
+ /* Force the TERM setting to vt102 for serial console
+ * if TERM is set to linux (the default) */
+ if (!s || strcmp(s, "linux") == 0)
+ putenv((char*)"TERM=vt102");
+ if (!ENABLE_FEATURE_INIT_SYSLOG)
+ log_console = NULL;
+ } else if (!s)
+ putenv((char*)"TERM=linux");
}
/* Set terminal settings to reasonable defaults */
-static void set_term(int fd)
+static void set_sane_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 |= HUPCL|CLOCAL;
+ tty.c_cflag &= CBAUD | CBAUDEX | CSIZE | CSTOPB | PARENB | PARODD;
+ tty.c_cflag |= CREAD | HUPCL | CLOCAL;
/* input modes */
tty.c_iflag = ICRNL | IXON | IXOFF;
tty.c_lflag =
ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
- tcsetattr(fd, TCSANOW, &tty);
+ tcsetattr(STDIN_FILENO, TCSANOW, &tty);
}
-/* How much memory does this machine have?
- Units are kBytes to avoid overflow on 4GB machines */
-static int check_free_memory()
+/* Open the new terminal device */
+static void open_stdio_to_tty(const char* tty_name, int exit_on_failure)
{
- struct sysinfo info;
- unsigned int result, u, s=10;
-
- if (sysinfo(&info) != 0) {
- perror_msg("Error checking free memory");
- return -1;
+ /* empty tty_name means "use init's tty", else... */
+ if (tty_name[0]) {
+ int fd;
+ close(0);
+ /* fd can be only < 0 or 0: */
+ fd = device_open(tty_name, O_RDWR);
+ if (fd) {
+ message(L_LOG | L_CONSOLE, "Can't open %s: %s",
+ tty_name, strerror(errno));
+ if (exit_on_failure)
+ _exit(1);
+ if (ENABLE_DEBUG_INIT)
+ _exit(2);
+ halt_reboot_pwoff(SIGUSR1); /* halt the system */
+ }
+ dup2(0, 1);
+ dup2(0, 2);
}
-
- /* 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;
+ set_sane_term();
}
-static void console_init()
+/* Used only by run_actions */
+static pid_t run(const struct init_action *a)
{
- int fd;
- int tried_devcons = 0;
- int tried_vtprimary = 0;
- struct vt_stat vt;
- struct serial_struct sr;
- char *s;
+ int i;
+ pid_t pid;
+ char *s, *tmpCmd, *cmdpath;
+ char *cmd[INIT_BUFFS_SIZE];
+ char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
+ sigset_t nmask, omask;
+
+ /* Block sigchild while forking (why?) */
+ sigemptyset(&nmask);
+ sigaddset(&nmask, SIGCHLD);
+ sigprocmask(SIG_BLOCK, &nmask, &omask);
+ pid = fork();
+ sigprocmask(SIG_SETMASK, &omask, NULL);
+
+ if (pid < 0)
+ message(L_LOG | L_CONSOLE, "Can't fork");
+ if (pid)
+ return pid;
+
+ /* Child */
+
+ /* 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);
- if ((s = getenv("TERM")) != NULL) {
- snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
- }
+ /* Create a new session and make ourself the process
+ * group leader */
+ setsid();
- 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++;
+ /* Open the new terminal device */
+ open_stdio_to_tty(a->terminal, 1 /* - exit if open fails*/);
+
+#ifdef BUT_RUN_ACTIONS_ALREADY_DOES_WAITING
+ /* 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 */
+ pid = fork();
+ if (pid < 0) {
+ message(L_LOG | L_CONSOLE, "Can't fork");
+ _exit(1);
}
- }
- 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");
+ if (pid > 0) {
+ /* Parent - wait till the child is done */
+ signal(SIGINT, SIG_IGN);
+ signal(SIGTSTP, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGCHLD, SIG_DFL);
+
+ waitfor(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. */
+ pid = fork();
+ if (pid < 0) {
+ message(L_LOG | L_CONSOLE, "Can't fork");
+ _exit(1);
+ }
+ if (pid == 0) {
+ setsid();
+ ioctl(0, TIOCSCTTY, 1);
+ _exit(0);
+ }
+ waitfor(pid);
+ _exit(0);
}
- 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++;
+ /* Child - fall though to actually execute things */
}
-}
-
-
-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=/bin/sh",
- "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;
+ /* See if any special /bin/sh requiring characters are present */
+ if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
+ cmd[0] = (char*)DEFAULT_SHELL;
+ cmd[1] = (char*)"-c";
+ cmd[2] = strcat(strcpy(buf, "exec "), a->command);
+ cmd[3] = NULL;
+ } else {
+ /* Convert command (char*) into cmd (char**, one word per string) */
+ strcpy(buf, a->command);
+ s = buf;
+ for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
+ if (*tmpCmd != '\0') {
+ cmd[i] = tmpCmd;
+ i++;
+ }
}
+ cmd[i] = NULL;
}
- if ((pid = fork()) == 0) {
- /* Clean up */
- ioctl(0, TIOCNOTTY, 0);
- close(0);
- close(1);
- close(2);
- setsid();
-
- /* Reset signal handlers set for parent process */
- signal(SIGUSR1, SIG_DFL);
- signal(SIGUSR2, SIG_DFL);
- signal(SIGINT, SIG_DFL);
- signal(SIGTERM, SIG_DFL);
- signal(SIGHUP, SIG_DFL);
-
- if ((fd = device_open(terminal, O_RDWR)) < 0) {
- if (stat(terminal, &sb) != 0) {
- message(LOG | CONSOLE, "device '%s' does not exist.\n",
- terminal);
- exit(1);
- }
- message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
- exit(1);
- }
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- ioctl(0, TIOCSCTTY, 1);
- tcsetpgrp(0, getpgrp());
- set_term(0);
-
- /* See if any special /bin/sh requiring characters are present */
- if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
- cmd[0] = SHELL;
- cmd[1] = "-c";
- strcpy(buf, "exec ");
- strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
- cmd[2] = buf;
- cmd[3] = NULL;
+ 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;
+
+#ifdef WHY_WE_DO_THIS_SHELL_MUST_HANDLE_THIS_ITSELF
+ /* find the last component in the command pathname */
+ s = bb_get_last_path_component_nostrip(cmdpath);
+ /* make a new argv[0] */
+ cmd[0] = malloc(strlen(s) + 2);
+ if (cmd[0] == NULL) {
+ message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
+ cmd[0] = cmdpath;
} 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;
+ cmd[0][0] = '-';
+ strcpy(cmd[0] + 1, s);
}
+#endif
- cmdpath = cmd[0];
+ /* _Attempt_ to make stdin a controlling tty. */
+ if (ENABLE_FEATURE_INIT_SCTTY)
+ ioctl(0, TIOCSCTTY, 0 /*only try, don't steal*/);
+ }
+ if (a->action & ASKFIRST) {
+ static const char press_enter[] ALIGN1 =
+#ifdef CUSTOMIZED_BANNER
+#include CUSTOMIZED_BANNER
+#endif
+ "\nPlease press Enter to activate this console. ";
+ char c;
/*
- 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").
+ * 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.
*/
+ messageD(L_LOG, "waiting for enter to start '%s'"
+ "(pid %d, tty '%s')\n",
+ cmdpath, getpid(), a->terminal);
+ full_write(1, press_enter, sizeof(press_enter) - 1);
+ while (safe_read(0, &c, 1) == 1 && c != '\n')
+ continue;
+ }
- 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
+ /* Log the process name and args */
+ message(L_LOG, "starting pid %d, tty '%s': '%s'",
+ getpid(), a->terminal, cmdpath);
-#if defined BB_FEATURE_INIT_COREDUMPS
- if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
+ if (ENABLE_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);
+ /* Now run it. The new program will take over this PID,
+ * so nothing further in init.c should be run. */
+ BB_EXECVP(cmdpath, cmd);
- /* We're still here? Some error happened. */
- message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
- strerror(errno));
- exit(-1);
- }
- return pid;
+ /* We're still here? Some error happened. */
+ message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
+ cmdpath, strerror(errno));
+ _exit(-1);
}
-static int waitfor(char *command, char *terminal, int get_enter)
+/* Run all commands of a particular type */
+static void run_actions(int action)
{
- int status, wpid;
- int pid = run(command, terminal, get_enter);
+ struct init_action *a, *tmp;
- while (1) {
- wpid = wait(&status);
- if (wpid > 0 && wpid != pid) {
- continue;
+ for (a = init_action_list; a; a = tmp) {
+ tmp = a->next;
+ if (a->action == action) {
+ // Pointless: run() will error out if open of device fails.
+ ///* a->terminal of "" means "init's console" */
+ //if (a->terminal[0] && access(a->terminal, R_OK | W_OK)) {
+ // //message(L_LOG | L_CONSOLE, "Device %s cannot be opened in RW mode", a->terminal /*, strerror(errno)*/);
+ // delete_init_action(a);
+ //} else
+ if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
+ waitfor(run(a));
+ 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 (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()
+static void init_reboot(unsigned long magic)
{
- 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_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);
- }
+ 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.... */
+ pid = vfork();
+ if (pid == 0) { /* child */
+ reboot(magic);
+ _exit(0);
}
+ waitfor(pid);
}
-
-#ifndef DEBUG_INIT
-static void shutdown_system(void)
+static void kill_all_processes(void)
{
+ sigset_t block_signals;
- /* first disable our SIGHUP signal */
- signal(SIGHUP, SIG_DFL);
+ /* 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 */
+ sigfillset(&block_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);
+
+ message(L_CONSOLE | L_LOG, "The system is going down NOW!");
/* 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");
+ message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "TERM");
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_actions(SHUTDOWN);
-
+ message(L_CONSOLE | L_LOG, "Sending SIG%s to all processes", "KILL");
+ kill(-1, SIGKILL);
sync();
- if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
- /* bdflush, kupdate not needed for kernels >2.2.11 */
- bdflush(1, 0);
- sync();
- }
+ sleep(1);
}
-static void halt_signal(int sig)
+static void halt_reboot_pwoff(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();
-
+ const char *m;
+ int rb;
+
+ kill_all_processes();
+
+ m = "halt";
+ rb = RB_HALT_SYSTEM;
+ if (sig == SIGTERM) {
+ m = "reboot";
+ rb = RB_AUTOBOOT;
+ } else if (sig == SIGUSR2) {
+ m = "poweroff";
+ rb = RB_POWER_OFF;
+ }
+ message(L_CONSOLE | L_LOG, "Requesting system %s", m);
/* 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);
+ init_reboot(rb);
+ loop_forever();
}
-static void reboot_signal(int sig)
+/* Handler for HUP and QUIT - exec "restart" action,
+ * else (no such action defined) do nothing */
+static void exec_restart_action(int sig ATTRIBUTE_UNUSED)
{
- 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);
+ struct init_action *a, *tmp;
+ sigset_t unblock_signals;
+
+ for (a = init_action_list; a; a = tmp) {
+ tmp = a->next;
+ if (a->action & RESTART) {
+ kill_all_processes();
+
+ /* unblock all signals (blocked in kill_all_processes()) */
+ sigfillset(&unblock_signals);
+ /*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);
+
+ /* Open the new terminal device */
+ open_stdio_to_tty(a->terminal, 0 /* - halt if open fails */);
+
+ messageD(L_CONSOLE | L_LOG, "Trying to re-exec %s", a->command);
+ BB_EXECLP(a->command, a->command, NULL);
+
+ message(L_CONSOLE | L_LOG, "Cannot run '%s': %s",
+ a->command, strerror(errno));
+ sleep(2);
+ init_reboot(RB_HALT_SYSTEM);
+ loop_forever();
+ }
+ }
}
-static void ctrlaltdel_signal(int sig)
+static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
{
run_actions(CTRLALTDEL);
}
-#endif /* ! DEBUG_INIT */
+/* The SIGSTOP & SIGTSTP handler */
+static void stop_handler(int sig ATTRIBUTE_UNUSED)
+{
+ int saved_errno = errno;
+
+ got_cont = 0;
+ while (!got_cont)
+ pause();
-static void new_initAction(initActionEnum action, char *process, char *cons)
+ errno = saved_errno;
+}
+
+/* The SIGCONT handler */
+static void cont_handler(int sig ATTRIBUTE_UNUSED)
{
- initAction *newAction;
+ got_cont = 1;
+}
- if (*cons == '\0')
- cons = console;
+static void new_init_action(uint8_t action, const char *command, const char *cons)
+{
+ struct init_action *new_action, *a, *last;
- /* 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"))
+ 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");
- while (1)
- sleep(1);
+ /* 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;
+ return;
+ }
+ last = a;
+ }
+
+ new_action = xzalloc(sizeof(struct init_action));
+ if (last) {
+ last->next = new_action;
+ } else {
+ init_action_list = new_action;
}
- 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);
+ strcpy(new_action->command, command);
+ new_action->action = action;
+ strcpy(new_action->terminal, cons);
+ messageD(L_LOG | L_CONSOLE, "command='%s' action=%d tty='%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 BB_FEATURE_USE_INITTAB is NOT defined,
+/* 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 BB_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 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;
+ char buf[INIT_BUFFS_SIZE];
+ if (ENABLE_FEATURE_USE_INITTAB)
+ file = fopen(INITTAB, "r");
+ else
+ file = NULL;
- file = fopen(INITTAB, "r");
+ /* No inittab file -- set up some default behavior */
if (file == NULL) {
- /* No inittab file -- set up some default behavior */
-#endif
/* Reboot on Ctrl-Alt-Del */
- new_initAction(CTRLALTDEL, "/sbin/reboot", console);
- /* Swapoff on halt/reboot */
- new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
+ new_init_action(CTRLALTDEL, "reboot", "");
/* Umount all filesystems on halt/reboot */
- new_initAction(SHUTDOWN, "/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);
+ new_init_action(SHUTDOWN, "umount -a -r", "");
+ /* Swapoff on halt/reboot */
+ if (ENABLE_SWAPONOFF)
+ new_init_action(SHUTDOWN, "swapoff -a", "");
+ /* Prepare to restart init when a HUP is received */
+ new_init_action(RESTART, "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 BB_FEATURE_USE_INITTAB
}
- while (fgets(buf, 255, file) != NULL) {
- foundIt = FALSE;
- /* Skip leading spaces */
- for (id = buf; *id == ' ' || *id == '\t'; id++);
+ while (fgets(buf, INIT_BUFFS_SIZE, file) != NULL) {
+ static const char actions[] =
+ STR_SYSINIT "sysinit\0"
+ STR_RESPAWN "respawn\0"
+ STR_ASKFIRST "askfirst\0"
+ STR_WAIT "wait\0"
+ STR_ONCE "once\0"
+ STR_CTRLALTDEL "ctrlaltdel\0"
+ STR_SHUTDOWN "shutdown\0"
+ STR_RESTART "restart\0"
+ ;
+ char tmpConsole[CONSOLE_NAME_SIZE];
+ char *id, *runlev, *action, *command;
+ const char *a;
+ /* Skip leading spaces */
+ id = skip_whitespace(buf);
/* Skip the line if it's a comment */
if (*id == '#' || *id == '\n')
continue;
+ /* Trim the trailing '\n' */
+ *strchrnul(id, '\n') = '\0';
- /* 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 */
+ /* Line is: "id:runlevel_ignored:action:command" */
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 (runlev == NULL /*|| runlev[1] == '\0' - not needed */)
+ goto bad_entry;
+ action = strchr(runlev + 1, ':');
+ if (action == NULL /*|| action[1] == '\0' - not needed */)
+ goto bad_entry;
+ command = strchr(action + 1, ':');
+ if (command == NULL || command[1] == '\0')
+ goto bad_entry;
+
+ *command = '\0'; /* action => ":action\0" now */
+ for (a = actions; a[0]; a += strlen(a) + 1) {
+ if (strcmp(a + 1, action + 1) == 0) {
+ *runlev = '\0';
if (*id != '\0') {
+ if (strncmp(id, "/dev/", 5) == 0)
+ id += 5;
strcpy(tmpConsole, "/dev/");
- strncat(tmpConsole, id, 200);
+ safe_strncpy(tmpConsole + 5, id,
+ sizeof(tmpConsole) - 5);
id = tmpConsole;
}
- new_initAction(a->action, process, id);
- foundIt = TRUE;
+ new_init_action((uint8_t)a[0], command + 1, id);
+ goto next_line;
}
- a++;
- }
- if (foundIt == TRUE)
- continue;
- else {
- /* Choke on an unknown action */
- message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
}
+ *command = ':';
+ /* Choke on an unknown action */
+ bad_entry:
+ message(L_LOG | L_CONSOLE, "Bad inittab entry: %s", id);
+ next_line: ;
}
- return;
-#endif /* BB_FEATURE_USE_INITTAB */
+ fclose(file);
}
+static void reload_signal(int sig ATTRIBUTE_UNUSED)
+{
+ struct init_action *a, *tmp;
+ message(L_LOG, "reloading /etc/inittab");
+
+ /* disable old entrys */
+ for (a = init_action_list; a; a = a->next) {
+ a->action = ONCE;
+ }
-extern int init_main(int argc, char **argv)
+ parse_inittab();
+
+ if (ENABLE_FEATURE_KILL_REMOVED) {
+ /* Be nice and send SIGTERM first */
+ for (a = init_action_list; a; a = a->next) {
+ pid_t pid = a->pid;
+ if ((a->action & ONCE) && pid != 0) {
+ kill(pid, SIGTERM);
+ }
+ }
+#if CONFIG_FEATURE_KILL_DELAY
+ if (fork() == 0) { /* child */
+ sleep(CONFIG_FEATURE_KILL_DELAY);
+ for (a = init_action_list; a; a = a->next) {
+ pid_t pid = a->pid;
+ if ((a->action & ONCE) && pid != 0) {
+ kill(pid, SIGKILL);
+ }
+ }
+ _exit(0);
+ }
+#endif
+ }
+
+ /* 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);
+}
+
+int init_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int init_main(int argc, char **argv)
{
- initAction *a, *tmp;
+ struct init_action *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();
+ die_sleep = 30 * 24*60*60; /* if xmalloc will ever die... */
+
+ if (argc > 1 && !strcmp(argv[1], "-q")) {
+ return kill(1, SIGHUP);
}
- /* 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();
+ if (!ENABLE_DEBUG_INIT) {
+ /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
+ if (getpid() != 1
+ && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc"))
+ ) {
+ bb_show_usage();
+ }
+ /* Set up sig handlers -- be sure to
+ * clear all of these in run() */
+ signal(SIGHUP, exec_restart_action);
+ signal(SIGQUIT, exec_restart_action);
+ signal(SIGUSR1, halt_reboot_pwoff); /* halt */
+ signal(SIGUSR2, halt_reboot_pwoff); /* poweroff */
+ signal(SIGTERM, halt_reboot_pwoff); /* reboot */
+ signal(SIGINT, ctrlaltdel_signal);
+ signal(SIGCONT, cont_handler);
+ signal(SIGSTOP, stop_handler);
+ signal(SIGTSTP, stop_handler);
+
+ /* 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);
+ }
/* 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);
+ set_sane_term();
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 */
-#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
-
+ message(MAYBE_CONSOLE | L_LOG, "init started: %s", bb_banner);
/* 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 < 1024*1024)
+ {
+ message(L_CONSOLE, "Low memory, forcing swapon");
+ /* swapon -a requires /proc typically */
+ new_init_action(SYSINIT, "mount -t proc proc /proc", "");
+ /* Try to turn on swap */
+ new_init_action(SYSINIT, "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, 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);
+ if (argc > 1
+ && (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || LONE_CHAR(argv[1], '1'))
+ ) {
+ /* 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 BB_FEATURE_USE_INITTAB is NOT defined,
+ /* 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();
}
- /* Make the command line just say "init" -- thats all, nothing else */
- fixup_argv(argc, argv, "init");
+#if ENABLE_SELINUX
+ if (getenv("SELINUX_INIT") == NULL) {
+ int enforce = 0;
+
+ putenv((char*)"SELINUX_INIT=YES");
+ if (selinux_init_load_policy(&enforce) == 0) {
+ BB_EXECVP(argv[0], argv);
+ } else if (enforce > 0) {
+ /* SELinux in enforcing mode but load_policy failed */
+ message(L_CONSOLE, "Cannot 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 */
+ strncpy(argv[0], "init", strlen(argv[0]));
+ /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
+ while (*++argv)
+ memset(*argv, 0, strlen(*argv));
/* Now run everything that needs to be run */
/* First run the sysinit command */
- for (a = initActionList; a; a = tmp) {
- tmp = a->nextPtr;
- if (a->action == SYSINIT) {
- waitfor(a->process, a->console, FALSE);
- /* Now remove the "sysinit" entry from the list */
- delete_initAction(a);
- }
- }
+ run_actions(SYSINIT);
+
/* Next run anything that wants to block */
- for (a = initActionList; a; a = tmp) {
- tmp = a->nextPtr;
- if (a->action == WAIT) {
- waitfor(a->process, a->console, FALSE);
- /* Now remove the "wait" entry from the list */
- delete_initAction(a);
- }
- }
+ 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");
- while (1)
- sleep(1);
- }
+ run_actions(ONCE);
+
+ /* Redefine SIGHUP to reread /etc/inittab */
+ if (ENABLE_FEATURE_USE_INITTAB)
+ signal(SIGHUP, reload_signal);
+ else
+ signal(SIGHUP, SIG_IGN);
/* 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) {
+ /* 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 any child process to exit */
+ 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(L_LOG, "process '%s' (pid %d) exited. "
+ "Scheduling it for restart.",
+ a->command, wpid);
}
}
+ /* see if anyone else is waiting to be reaped */
+ wpid = wait_any_nohang(NULL);
}
- sleep(1);
}
}
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff