/*
* Mini init implementation for busybox
*
- *
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
+ * Copyright (C) 1999-2002 by Erik Andersen <andersee@debian.org>
* Adjusted by so many folks, it's impossible to keep track.
*
* This program is free software; you can redistribute it and/or modify
#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
+#ifdef CONFIG_SYSLOGD
# include <sys/syslog.h>
#endif
+#if defined(__UCLIBC__) && !defined(__UCLIBC_HAS_MMU__)
+#define fork vfork
+#endif
/* From <linux/vt.h> */
struct vt_stat {
};
-
-#ifndef RB_HALT_SYSTEM
-static const int RB_HALT_SYSTEM = 0xcdef0123;
-static const int RB_ENABLE_CAD = 0x89abcdef;
-static const int RB_DISABLE_CAD = 0;
-#define RB_POWER_OFF 0x4321fedc
-static const int RB_AUTOBOOT = 0x01234567;
-#if defined(__GLIBC__) || defined (__UCLIBC__)
-#include <sys/reboot.h>
+#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
-#endif
#ifndef _PATH_STDPATH
#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
#endif
-
-#if defined BB_FEATURE_INIT_COREDUMPS
+#if defined CONFIG_FEATURE_INIT_COREDUMPS
/*
* When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
* before processes are spawned to set core file size as unlimited.
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
-#if defined(__GLIBC__)
-#include <sys/kdaemon.h>
+#if __GNU_LIBRARY__ > 5
+ #include <sys/kdaemon.h>
#else
-#include <sys/syscall.h>
-#include <linux/unistd.h>
-static _syscall2(int, bdflush, int, func, int, data);
-#endif /* __GLIBC__ */
-
-
-#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
-#define VT_SECONDARY "/dev/tty2" /* Virtual console */
-#define VT_THIRD "/dev/tty3" /* Virtual console */
-#define VT_FOURTH "/dev/tty4" /* Virtual console */
-#define VT_LOG "/dev/tty5" /* Virtual console */
-#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
-#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
-#define SHELL "-/bin/sh" /* Default shell */
+ extern int bdflush (int func, long int data);
+#endif
+
+#define SHELL "/bin/sh" /* Default shell */
+#define LOGIN_SHELL "-" SHELL /* Default login shell */
#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef INIT_SCRIPT
#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
#endif
-static const int MAXENV = 16; /* Number of env. vars */
-static const int LOG = 0x1;
-static const int CONSOLE = 0x2;
+#define MAXENV 16 /* Number of env. vars */
/* Allowed init action types */
-typedef enum {
- SYSINIT = 1,
- RESPAWN,
- ASKFIRST,
- WAIT,
- ONCE,
- CTRLALTDEL
-} 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},
{"wait", WAIT},
{"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[256];
+ char terminal[256];
+ struct init_action *next;
+ int action;
};
-initAction *initActionList = NULL;
-
-static char *secondConsole = VT_SECONDARY;
-static char *thirdConsole = VT_THIRD;
-static char *fourthConsole = VT_FOURTH;
-static char *log = VT_LOG;
+/* Static variables */
+static struct init_action *init_action_list = NULL;
+static char *secondConsole = VC_2;
+static char *thirdConsole = VC_3;
+static char *fourthConsole = VC_4;
+static char *log = VC_5;
static int kernelVersion = 0;
static char termType[32] = "TERM=linux";
static char console[32] = _PATH_CONSOLE;
+static sig_atomic_t got_cont = 0;
+static const int LOG = 0x1;
+static const int CONSOLE = 0x2;
+#if defined CONFIG_FEATURE_EXTRA_QUIET
+static const int MAYBE_CONSOLE = 0x0;
+#else
+#define MAYBE_CONSOLE CONSOLE
+#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
-static void delete_initAction(initAction * action);
+/* Function prototypes */
+static void delete_init_action(struct init_action *a);
+static int waitfor(struct init_action *a);
+static void loop_forever(void)
+{
+ while (1)
+ sleep (1);
+}
+
/* Print a message to the specified device.
* Device may be bitwise-or'd from LOG | CONSOLE */
-static void message(int device, char *fmt, ...)
- __attribute__ ((format (printf, 2, 3)));
+#ifdef DEBUG_INIT
+static inline messageND(int device, char *fmt, ...) { }
+#else
+#define messageND message
+#endif
+static void message(int device, char *fmt, ...) __attribute__ ((format (printf, 2, 3)));
static void message(int device, char *fmt, ...)
{
va_list arguments;
int fd;
-#ifdef BB_SYSLOGD
+#ifdef CONFIG_SYSLOGD
/* Log the message to syslogd */
if (device & LOG) {
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();
+ syslog_msg(LOG_USER, LOG_INFO, msg);
}
#else
static int log_fd = -1;
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);
+ fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
log = NULL;
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) {
+ device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
va_start(arguments, fmt);
vdprintf(fd, fmt, arguments);
va_end(arguments);
}
/* Set terminal settings to reasonable defaults */
-void set_term(int fd)
+static void set_term(int fd)
{
struct termios tty;
/* Make it be sane */
tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
- tty.c_cflag |= HUPCL|CLOCAL;
+ tty.c_cflag |= CREAD|HUPCL|CLOCAL;
+
/* input modes */
tty.c_iflag = ICRNL | IXON | IXOFF;
/* How much memory does this machine have?
Units are kBytes to avoid overflow on 4GB machines */
-static int check_free_memory()
+static int check_free_memory(void)
{
struct sysinfo info;
unsigned int result, u, s=10;
return result;
}
-static void console_init()
+static void console_init(void)
{
int fd;
int tried_devcons = 0;
}
if ((s = getenv("CONSOLE")) != NULL) {
- snprintf(console, sizeof(console) - 1, "%s", s);
+ safe_strncpy(console, s, sizeof(console));
}
#if #cpu(sparc)
/* sparc kernel supports console=tty[ab] parameter which is also
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);
+ safe_strncpy(console, SC_0, sizeof(console));
else if (strcmp(s, "ttyb") == 0)
- snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
+ safe_strncpy(console, SC_1, sizeof(console));
}
#endif
else {
/* 2.2 kernels: identify the real console backend and try to use it */
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
/* this is a serial console */
- snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
+ snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
} else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
/* this is linux virtual tty */
- snprintf(console, sizeof(console) - 1, "/dev/tty%d",
- vt.v_active);
+ snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
} else {
- snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
+ safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
tried_devcons++;
}
}
/* Can't open selected console -- try /dev/console */
if (!tried_devcons) {
tried_devcons++;
- snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
+ safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
continue;
}
/* Can't open selected console -- try vt1 */
if (!tried_vtprimary) {
tried_vtprimary++;
- snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
+ safe_strncpy(console, VC_1, sizeof(console));
continue;
}
break;
}
if (fd < 0) {
/* Perhaps we should panic here? */
- snprintf(console, sizeof(console) - 1, "/dev/null");
+ safe_strncpy(console, "/dev/null", sizeof(console));
} else {
- /* check for serial console and disable logging to tty5 & running a
- * shell to tty2-4 */
+ /* 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;
/* 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");
+ safe_strncpy(termType, "TERM=vt102", sizeof(termType));
message(LOG | CONSOLE,
- "serial console detected. Disabling virtual terminals.\r\n");
+ "\rserial console detected. Disabling virtual terminals.\n");
}
close(fd);
}
message(LOG, "console=%s\n", console);
}
+
+static void fixup_argv(int argc, char **argv, char *new_argv0)
+{
+ int len;
+ /* Fix up argv[0] to be certain we claim to be init */
+ len = strlen(argv[0]);
+ memset(argv[0], 0, len);
+ safe_strncpy(argv[0], new_argv0, len + 1);
+
+ /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
+ len = 1;
+ while (argc > len) {
+ memset(argv[len], 0, strlen(argv[len]));
+ len++;
+ }
+}
-static pid_t run(char *command, char *terminal, int get_enter)
+/* 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)
{
- int i=0, j=0;
- int fd;
- pid_t pid;
- char *tmpCmd;
- char *cmd[255], *cmdpath;
- char buf[255];
- static const char press_enter[] =
+ struct stat statBuf;
-#ifdef CUSTOMIZED_BANNER
-#include CUSTOMIZED_BANNER
+ if (check_free_memory() > 1000)
+ return;
+
+#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
+ if (stat("/etc/fstab", &statBuf) == 0) {
+ /* swapon -a requires /proc typically */
+ system("/bin/mount -t proc proc /proc");
+ /* Try to turn on swap */
+ system("/sbin/swapon -a");
+ if (check_free_memory() < 1000)
+ goto goodnight;
+ } else
+ goto goodnight;
+ return;
#endif
- "\nPlease press Enter to activate this console. ";
+ goodnight:
+ message(CONSOLE,
+ "\rSorry, your computer does not have enough memory.\n");
+ loop_forever();
+}
+
+static pid_t run(struct init_action *a)
+{
+ struct stat sb;
+ int i, j, fd, junk;
+ pid_t pid, pgrp, tmp_pid;
+ char *s, *tmpCmd, *cmd[255], *cmdpath, buf[255];
+ sigset_t nmask, omask;
char *environment[MAXENV+1] = {
- "HOME=/",
- "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
- "SHELL=/bin/sh",
termType,
- "USER=root"
+ "HOME=/",
+ "PATH=" _PATH_STDPATH,
+ "SHELL=" SHELL,
+ "USER=root",
+ NULL
};
+ static const char press_enter[] =
+#ifdef CUSTOMIZED_BANNER
+#include CUSTOMIZED_BANNER
+#endif
+ "\nPlease press Enter to activate this console. ";
- while (environment[i]) i++;
- while ((environ[j]) && (i < MAXENV)) {
- if (strncmp(environ[j], "TERM=", 5))
- environment[i++] = environ[j];
- else {
- snprintf(termType, sizeof(termType) - 1, environ[j]);
+ /* 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;
}
- j++;
}
- if ((pid = fork()) == 0) {
+ /* 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);
+ sigprocmask(SIG_SETMASK, &omask, NULL);
+
+ /* Create a new session and make ourself the process group leader */
setsid();
- /* 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(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
- signal(SIGHUP, SIG_DFL);
-
- if ((fd = device_open(terminal, O_RDWR)) < 0) {
- message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
- exit(1);
+ signal(SIGHUP, SIG_DFL);
+ signal(SIGCONT, SIG_DFL);
+ signal(SIGSTOP, SIG_DFL);
+ signal(SIGTSTP, SIG_DFL);
+
+ /* Open the new terminal device */
+ if ((fd = device_open(a->terminal, O_RDWR|O_NOCTTY)) < 0) {
+ if (stat(a->terminal, &sb) != 0) {
+ message(LOG | CONSOLE, "\rdevice '%s' does not exist.\n",
+ a->terminal);
+ _exit(1);
+ }
+ message(LOG | CONSOLE, "\rBummer, can't open %s\n", a->terminal);
+ _exit(1);
}
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- ioctl(0, TIOCSCTTY, 1);
- tcsetpgrp(0, getpgrp());
+ /* Make sure the terminal will act fairly normal for us */
set_term(0);
- if (get_enter == TRUE) {
- /*
- * Save memory by not exec-ing anything large (like a shell)
- * before the user wants it. This is critical if swap is not
- * enabled and the system has low memory. Generally this will
- * be run on the second virtual console, and the first will
- * be allowed to start a shell or whatever an init script
- * specifies.
- */
-#ifdef DEBUG_INIT
- pid_t shell_pgid = getpid();
- message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
- command, shell_pgid, terminal);
-#endif
- write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
- getc(stdin);
- }
+ /* If the init Action requires up to wait, then force the
+ * supplied terminal to be the controlling tty. */
+ if (a->action & (SYSINIT|WAIT|CTRLALTDEL|SHUTDOWN|RESTART|ASKFIRST)) {
+
+ /* Take over the controlling tty */
+ ioctl(fd, TIOCSCTTY, 1);
+ /* Setup stdin, stdout, stderr for the new process so
+ * they point to the supplied terminal */
+ dup(fd);
+ dup(fd);
+
+ /* Now fork off another process to just hang around */
+ if ((pid = fork()) < 0) {
+ message(LOG | CONSOLE, "Can't fork!\n");
+ _exit(1);
+ }
-#ifdef DEBUG_INIT
- /* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '%s'\r\n",
- shell_pgid, terminal, command);
-#endif
+ 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);
+
+ /* Wait for child to exit */
+ while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
+ if (tmp_pid < 0 && errno == ECHILD)
+ break;
+ }
+
+ /* See if stealing the controlling tty back is necessary */
+ pgrp = tcgetpgrp(tmp_pid);
+ if (pgrp != getpid())
+ _exit(0);
+
+ /* Use a temporary process to steal the controlling tty. */
+ if ((pid = fork()) < 0) {
+ message(LOG | CONSOLE, "\rCan't fork!\n");
+ _exit(1);
+ }
+ if (pid == 0) {
+ setsid();
+ ioctl(tmp_pid, TIOCSCTTY, 1);
+ _exit(0);
+ }
+ while((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
+ if (tmp_pid < 0 && errno == ECHILD)
+ break;
+ }
+ _exit(0);
+ }
+
+ /* Now fall though to actually execute things */
+ } else {
+ dup(fd);
+ dup(fd);
+ }
/* See if any special /bin/sh requiring characters are present */
- if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
+ if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
cmd[0] = SHELL;
cmd[1] = "-c";
strcpy(buf, "exec ");
- strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
+ safe_strncpy(buf + sizeof("exec "), a->command,
+ sizeof(buf) - sizeof("exec "));
cmd[2] = buf;
cmd[3] = NULL;
} else {
/* Convert command (char*) into cmd (char**, one word per string) */
- for (tmpCmd = command, i = 0;
- (tmpCmd = strsep(&command, " \t")) != NULL;) {
+ safe_strncpy(buf, a->command, sizeof(buf));
+ s = buf;
+ for (tmpCmd = buf, i = 0;
+ (tmpCmd = strsep(&s, " \t")) != NULL;) {
if (*tmpCmd != '\0') {
cmd[i] = tmpCmd;
tmpCmd++;
cmd[i] = NULL;
}
- cmdpath = cmd[0];
+ 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
+ /*
+ Interactive shells want to see a dash in argv[0]. This
+ typically is handled by login, argv will be setup this
+ way if a dash appears at the front of the command path
(like "-/bin/sh").
- */
-
- if (*cmdpath == '-') {
- char *s;
-
- /* skip over the dash */
- ++cmdpath;
-
- /* find the last component in the command pathname */
- s = get_last_path_component(cmdpath);
-
- /* make a new argv[0] */
- if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
- message(LOG | CONSOLE, "malloc failed");
- cmd[0] = cmdpath;
- } else {
- cmd[0][0] = '-';
- strcpy(cmd[0]+1, s);
- }
- }
-
-#if defined BB_FEATURE_INIT_COREDUMPS
- {
- struct stat sb;
- if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
- struct rlimit limit;
- limit.rlim_cur = RLIM_INFINITY;
- limit.rlim_max = RLIM_INFINITY;
- setrlimit(RLIMIT_CORE, &limit);
+ */
+
+ 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 (a->action & ASKFIRST) {
+ /*
+ * 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.
+ */
+ messageND(LOG, "Waiting for enter to start '%s' (pid %d, terminal %s)\n",
+ cmdpath, getpid(), a->terminal);
+ write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
+ getc(stdin);
+ }
+
+ /* Log the process name and args */
+ messageND(LOG, "Starting pid %d, console %s: '%s'\n",
+ 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);
+ }
#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);
+ execve(cmdpath, cmd, environment);
- /* We're still here? Some error happened. */
- message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
- strerror(errno));
- exit(-1);
+ /* We're still here? Some error happened. */
+ message(LOG | CONSOLE, "\rBummer, could not run '%s': %s\n", cmdpath,
+ strerror(errno));
+ _exit(-1);
}
+ sigprocmask(SIG_SETMASK, &omask, NULL);
return pid;
}
-static int waitfor(char *command, char *terminal, int get_enter)
+static int waitfor(struct init_action *a)
{
+ int pid;
int status, wpid;
- int pid = run(command, terminal, get_enter);
+ pid = run(a);
while (1) {
wpid = wait(&status);
if (wpid > 0 && wpid != pid) {
return wpid;
}
-/* Make sure there is enough memory to do something useful. *
- * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
-static void check_memory()
-{
- struct stat statBuf;
-
- if (check_free_memory() > 1000)
- return;
-
- if (stat("/etc/fstab", &statBuf) == 0) {
- /* swapon -a requires /proc typically */
- waitfor("mount proc /proc -t proc", console, FALSE);
- /* Try to turn on swap */
- waitfor("swapon -a", console, FALSE);
- if (check_free_memory() < 1000)
- goto goodnight;
- } else
- goto goodnight;
- return;
-
- goodnight:
- message(CONSOLE,
- "Sorry, your computer does not have enough memory.\r\n");
- while (1)
- sleep(1);
-}
-
-/* Run all commands to be run right before halt/reboot */
-static void run_lastAction(void)
+/* Run all commands of a particular type */
+static void run_actions(int action)
{
- initAction *a;
- for (a = initActionList; a; a = a->nextPtr) {
- if (a->action == CTRLALTDEL) {
- waitfor(a->process, a->console, FALSE);
- delete_initAction(a);
+ struct init_action *a, *tmp;
+
+ for (a = init_action_list; a; a = tmp) {
+ tmp = a->next;
+ if (a->action == action) {
+ if (a->action & (SYSINIT|WAIT|CTRLALTDEL|SHUTDOWN|RESTART)) {
+ waitfor(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);
+ }
+ }
}
}
}
#ifndef DEBUG_INIT
static void shutdown_system(void)
{
-
- /* first disable our SIGHUP signal */
- signal(SIGHUP, SIG_DFL);
+ sigset_t block_signals;
+
+ /* first disable all our signals */
+ sigemptyset(&block_signals);
+ sigaddset(&block_signals, SIGHUP);
+ 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, "\r\nThe system is going down NOW !!\r\n");
+ message(CONSOLE|LOG, "\n\rThe system is going down NOW !!\n");
sync();
/* Send signals to every process _except_ pid 1 */
- message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
+ message(CONSOLE|LOG, "\rSending SIGTERM to all processes.\n");
kill(-1, SIGTERM);
sleep(1);
sync();
- message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
+ message(CONSOLE|LOG, "\rSending SIGKILL to all processes.\n");
kill(-1, SIGKILL);
sleep(1);
- /* run everything to be run at "ctrlaltdel" */
- run_lastAction();
+ /* run everything to be run at "shutdown" */
+ run_actions(SHUTDOWN);
sync();
if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
}
}
+static void exec_signal(int sig)
+{
+ struct init_action *a, *tmp;
+ for (a = init_action_list; a; a = tmp) {
+ tmp = a->next;
+ if (a->action & RESTART) {
+ shutdown_system();
+ message(CONSOLE|LOG, "\rTrying to re-exec %s\n", a->command);
+ execl(a->command, a->command, NULL);
+
+ message(CONSOLE|LOG, "\rexec of '%s' failed: %s\n",
+ a->command, sys_errlist[errno]);
+ sync();
+ sleep(2);
+ init_reboot(RB_HALT_SYSTEM);
+ loop_forever();
+ }
+ }
+}
+
static void halt_signal(int sig)
{
shutdown_system();
message(CONSOLE|LOG,
- "The system is halted. Press %s or turn off power\r\n",
- (secondConsole == NULL) /* serial console */
- ? "Reset" : "CTRL-ALT-DEL");
+#if #cpu(s390)
+ /* Seems the s390 console is Wierd(tm). */
+ "\rThe system is halted. You may reboot now.\n"
+#else
+ /* secondConsole is NULL for a serial console */
+ "\rThe system is halted. Press %s or turn off power\n",
+ (secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
+#endif
+ );
sync();
/* allow time for last message to reach serial console */
init_reboot(RB_POWER_OFF);
else
init_reboot(RB_HALT_SYSTEM);
- exit(0);
+
+ loop_forever();
}
static void reboot_signal(int sig)
{
shutdown_system();
- message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
+ message(CONSOLE|LOG, "\rPlease stand by while rebooting the system.\n");
sync();
/* allow time for last message to reach serial console */
sleep(2);
init_reboot(RB_AUTOBOOT);
- exit(0);
+
+ loop_forever();
+}
+
+static void ctrlaltdel_signal(int sig)
+{
+ run_actions(CTRLALTDEL);
+}
+
+/* The SIGSTOP & SIGTSTP handler */
+static void stop_handler(int sig)
+{
+ int saved_errno = errno;
+
+ got_cont = 0;
+ while(!got_cont) pause();
+ got_cont = 0;
+ errno = saved_errno;
+}
+
+/* The SIGCONT handler */
+static void cont_handler(int sig)
+{
+ got_cont = 1;
}
#endif /* ! DEBUG_INIT */
-void new_initAction(initActionEnum action, char *process, char *cons)
+static void new_init_action(int action, char *command, char *cons)
{
- initAction *newAction;
+ struct init_action *new_action, *a;
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.
+ /* If BusyBox detects that a serial console is in use, then entries
+ * not refering to the console or null devices will _not_ be run.
* The exception to this rule is the null device.
*/
if (secondConsole == NULL && strcmp(cons, console)
&& strcmp(cons, "/dev/null"))
return;
+ if (strcmp(cons, "/dev/null") == 0 && (action & ASKFIRST))
+ return;
- newAction = calloc((size_t) (1), sizeof(initAction));
- if (!newAction) {
- message(LOG | CONSOLE, "Memory allocation failure\n");
- while (1)
- sleep(1);
+ new_action = calloc((size_t) (1), sizeof(struct init_action));
+ if (!new_action) {
+ message(LOG | CONSOLE, "\rMemory allocation failure\n");
+ loop_forever();
+ }
+
+ /* Append to the end of the list */
+ for (a = init_action_list; a && a->next; a = a->next) ;
+ if (a) {
+ a->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);
+ safe_strncpy(new_action->command, command, 255);
+ new_action->action = action;
+ safe_strncpy(new_action->terminal, cons, 255);
+ new_action->pid = 0;
+// message(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 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
+ * 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.
* */
-void parse_inittab(void)
+static void parse_inittab(void)
{
-#ifdef BB_FEATURE_USE_INITTAB
+#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;
+ char *id, *runlev, *action, *command, *eol;
+ const struct init_action_type *a = actions;
int foundIt;
if (file == NULL) {
/* No inittab file -- set up some default behavior */
#endif
- /* Swapoff on halt/reboot */
- new_initAction(CTRLALTDEL, "/sbin/swapoff -a", console);
+ /* Reboot on Ctrl-Alt-Del */
+ new_init_action(CTRLALTDEL, "/sbin/reboot", console);
/* Umount all filesystems on halt/reboot */
- new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
+ new_init_action(SHUTDOWN, "/bin/umount -a -r", console);
+#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
+ /* Swapoff on halt/reboot */
+ new_init_action(SHUTDOWN, "/sbin/swapoff -a", console);
+#endif
+ /* Prepare to restart init when a HUP is received */
+ new_init_action(RESTART, "/sbin/init", console);
/* Askfirst shell on tty1 */
- new_initAction(ASKFIRST, SHELL, console);
+ new_init_action(ASKFIRST, LOGIN_SHELL, console);
/* Askfirst shell on tty2 */
if (secondConsole != NULL)
- new_initAction(ASKFIRST, SHELL, secondConsole);
+ new_init_action(ASKFIRST, LOGIN_SHELL, secondConsole);
/* Askfirst shell on tty3 */
if (thirdConsole != NULL)
- new_initAction(ASKFIRST, SHELL, thirdConsole);
+ new_init_action(ASKFIRST, LOGIN_SHELL, thirdConsole);
/* Askfirst shell on tty4 */
if (fourthConsole != NULL)
- new_initAction(ASKFIRST, SHELL, fourthConsole);
+ new_init_action(ASKFIRST, LOGIN_SHELL, fourthConsole);
/* sysinit */
- new_initAction(SYSINIT, INIT_SCRIPT, console);
+ new_init_action(SYSINIT, INIT_SCRIPT, console);
return;
-#ifdef BB_FEATURE_USE_INITTAB
+#ifdef CONFIG_FEATURE_USE_INITTAB
}
while (fgets(buf, 255, file) != NULL) {
/* 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, "\rBad inittab entry: %s\n", 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, "\rBad 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);
+ /* Separate the action from the command */
+ command = strchr(action, ':');
+ if (command == NULL || *(command + 1) == '\0') {
+ message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
continue;
} else {
- *process = '\0';
- ++process;
+ *command = '\0';
+ ++command;
}
/* Ok, now process it */
while (a->name != 0) {
if (strcmp(a->name, action) == 0) {
if (*id != '\0') {
- struct stat statBuf;
-
strcpy(tmpConsole, "/dev/");
strncat(tmpConsole, id, 200);
- if (stat(tmpConsole, &statBuf) != 0) {
- message(LOG | CONSOLE,
- "device '%s' does not exist. Did you read the directions?\n",
- tmpConsole);
- break;
- }
id = tmpConsole;
}
- new_initAction(a->action, process, id);
+ new_init_action(a->action, command, id);
foundIt = TRUE;
}
a++;
continue;
else {
/* Choke on an unknown action */
- message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
+ message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
}
}
return;
-#endif /* BB_FEATURE_USE_INITTAB */
+#endif /* CONFIG_FEATURE_USE_INITTAB */
}
extern int init_main(int argc, char **argv)
{
- initAction *a;
+ struct init_action *a;
pid_t wpid;
int status;
+ if (argc > 1 && !strcmp(argv[1], "-q")) {
+ /* don't assume init's pid == 1 */
+ long *pid = find_pid_by_name("init");
+ if (!pid || *pid<=0) {
+ pid = find_pid_by_name("linuxrc");
+ if (!pid || *pid<=0)
+ error_msg_and_die("no process killed");
+ }
+ kill(*pid, SIGHUP);
+ exit(0);
+ }
+
#ifndef DEBUG_INIT
/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
if (getpid() != 1
-#ifdef BB_FEATURE_LINUXRC
+#ifdef CONFIG_FEATURE_INITRD
&& strstr(applet_name, "linuxrc") == NULL
#endif
)
}
/* Set up sig handlers -- be sure to
* clear all of these in run() */
+ signal(SIGHUP, exec_signal);
signal(SIGUSR1, halt_signal);
signal(SIGUSR2, halt_signal);
- signal(SIGINT, reboot_signal);
+ signal(SIGINT, ctrlaltdel_signal);
signal(SIGTERM, reboot_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... */
/* 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();
+
set_term(0);
chdir("/");
setsid();
/* Make sure PATH is set to something sane */
- putenv(_PATH_STDPATH);
+ putenv("PATH="_PATH_STDPATH);
/* Hello world */
-#ifndef DEBUG_INIT
- message(
-#if ! defined BB_FEATURE_EXTRA_QUIET
- CONSOLE|
-#endif
- LOG,
- "init started: %s\r\n", full_version);
-#else
- message(
-#if ! defined BB_FEATURE_EXTRA_QUIET
- CONSOLE|
-#endif
- LOG,
- "init(%d) started: %s\r\n", getpid(), full_version);
-#endif
-
+ message(MAYBE_CONSOLE|LOG, "\rinit started: %s\n", full_version);
/* Make sure there is enough memory to do something useful. */
check_memory();
!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);
+ new_init_action(ASKFIRST, LOGIN_SHELL, secondConsole);
if (thirdConsole != NULL)
- new_initAction(ASKFIRST, SHELL, thirdConsole);
+ new_init_action(ASKFIRST, LOGIN_SHELL, thirdConsole);
if (fourthConsole != NULL)
- new_initAction(ASKFIRST, SHELL, fourthConsole);
+ new_init_action(ASKFIRST, LOGIN_SHELL, fourthConsole);
/* Start a shell on tty1 */
- new_initAction(RESPAWN, SHELL, console);
+ new_init_action(RESPAWN, LOGIN_SHELL, console);
} 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();
}
- /* Fix up argv[0] to be certain we claim to be init */
- argv[0]="init";
-
- if (argc > 1)
- argv[1][0]=0;
+ /* Make the command line just say "init" -- thats all, nothing else */
+ fixup_argv(argc, argv, "init");
/* Now run everything that needs to be run */
/* First run the sysinit command */
- for (a = initActionList; a; a = a->nextPtr) {
- if (a->action == SYSINIT) {
- waitfor(a->process, a->console, FALSE);
- /* Now remove the "sysinit" entry from the list */
- delete_initAction(a);
- }
- }
+ run_actions(SYSINIT);
+
/* Next run anything that wants to block */
- for (a = initActionList; a; a = a->nextPtr) {
- if (a->action == WAIT) {
- waitfor(a->process, a->console, FALSE);
- /* Now remove the "wait" entry from the list */
- delete_initAction(a);
- }
- }
+ run_actions(WAIT);
+
/* Next run anything to be run only once */
- for (a = initActionList; a; a = a->nextPtr) {
- if (a->action == ONCE) {
- run(a->process, a->console, FALSE);
- /* Now remove the "once" entry from the list */
- delete_initAction(a);
- }
- }
+ run_actions(ONCE);
+
/* 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);
+ if (init_action_list == NULL) {
+ message(LOG | CONSOLE, "\rNo more tasks for init -- sleeping forever.\n");
+ loop_forever();
}
/* Now run the looping stuff for the rest of forever */
while (1) {
- for (a = initActionList; a; a = a->nextPtr) {
- /* Only run stuff with pid==0. If they have
- * a pid, that means they are still running */
- if (a->pid == 0) {
- switch (a->action) {
- case RESPAWN:
- /* run the respawn stuff */
- a->pid = run(a->process, a->console, FALSE);
- break;
- case ASKFIRST:
- /* run the askfirst stuff */
- a->pid = run(a->process, a->console, TRUE);
- break;
- /* silence the compiler's incessant whining */
- default:
- break;
- }
- }
- }
+ /* 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) {
/* 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.\n", a->command, wpid);
}
}
}
- sleep(1);
}
}
projects / oweals / busybox.git / blobdiff