* 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>
+ * 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
-#if defined(__UCLIBC__) && !defined(__UCLIBC_HAS_MMU__)
-#define fork vfork
-#endif
-
#define INIT_BUFFS_SIZE 256
/* From <linux/vt.h> */
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 _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 */
#ifndef INIT_SCRIPT
#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
/* Static variables */
static struct init_action *init_action_list = NULL;
-static int kernelVersion;
-static char console[CONSOLE_BUFF_SIZE] = _PATH_CONSOLE;
+static char console[CONSOLE_BUFF_SIZE] = CONSOLE_DEV;
#ifndef CONFIG_SYSLOGD
-static char *log = VC_5;
+static char *log_console = VC_5;
#endif
+#if !ENABLE_DEBUG_INIT
static sig_atomic_t got_cont = 0;
-static const int LOG = 0x1;
-static const int CONSOLE = 0x2;
+#endif
+
+enum {
+ LOG = 0x1,
+ CONSOLE = 0x2,
#if defined CONFIG_FEATURE_EXTRA_QUIET
-static const int MAYBE_CONSOLE = 0x0;
+ MAYBE_CONSOLE = 0x0,
#else
-#define MAYBE_CONSOLE CONSOLE
+ 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;
+#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 const char * const environment[] = {
"HOME=/",
"PATH=" _PATH_STDPATH,
- "SHELL=" SHELL,
+ "SHELL=/bin/sh",
"USER=root",
NULL
};
/* Function prototypes */
static void delete_init_action(struct init_action *a);
-static int waitfor(const 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)
{
/* Print a message to the specified device.
* Device may be bitwise-or'd from LOG | CONSOLE */
-#ifndef DEBUG_INIT
-static inline void messageD(int device, const char *fmt, ...)
-{
-}
-#else
+#if ENABLE_DEBUG_INIT
#define messageD message
+#else
+#define messageD(...) do {} while (0)
#endif
static void message(int device, const char *fmt, ...)
__attribute__ ((format(printf, 2, 3)));
{
va_list arguments;
int l;
- char msg[1024];
+ RESERVE_CONFIG_BUFFER(msg, 1024);
#ifndef CONFIG_SYSLOGD
static int log_fd = -1;
#endif
msg[0] = '\r';
va_start(arguments, fmt);
- l = vsnprintf(msg + 1, sizeof(msg) - 2, fmt, arguments) + 1;
+ l = vsnprintf(msg + 1, 1024 - 2, fmt, arguments) + 1;
va_end(arguments);
#ifdef CONFIG_SYSLOGD
/* Log the message to syslogd */
if (device & LOG) {
/* don`t out "\r\n" */
- syslog_msg(LOG_DAEMON, LOG_INFO, msg + 1);
+ openlog(applet_name, 0, LOG_DAEMON);
+ syslog(LOG_INFO, "%s", msg + 1);
+ closelog();
}
msg[l++] = '\n';
/* Take full control of the log tty, and never close it.
* It's mine, all mine! Muhahahaha! */
if (log_fd < 0) {
- if ((log_fd = device_open(log, O_RDWR | O_NDELAY | O_NOCTTY)) < 0) {
+ if ((log_fd = device_open(log_console, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {
log_fd = -2;
- bb_error_msg("Bummer, can't write to log on %s!", log);
+ 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)) {
- bb_full_write(log_fd, msg, l);
+ full_write(log_fd, msg, l);
}
#endif
if (device & CONSOLE) {
- int fd = device_open(_PATH_CONSOLE,
- O_WRONLY | O_NOCTTY | O_NDELAY);
+ 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 >= 0) {
- bb_full_write(fd, msg, l);
+ full_write(fd, msg, l);
close(fd);
-#ifdef DEBUG_INIT
+#if ENABLE_DEBUG_INIT
/* all descriptors may be closed */
} else {
- bb_error_msg("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_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) {
- bb_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)
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 */
- /* remap tty[ab] to /dev/ttyS[01] */
- if (strcmp(s, "ttya") == 0)
- safe_strncpy(console, SC_0, sizeof(console));
- else if (strcmp(s, "ttyb") == 0)
- safe_strncpy(console, SC_1, sizeof(console));
-#endif
} else {
/* 2.2 kernels: identify the real console backend and try to use it */
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
/* this is linux virtual tty */
snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
} else {
- safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
+ safe_strncpy(console, CONSOLE_DEV, sizeof(console));
tried++;
}
}
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 ? _PATH_CONSOLE : CURRENT_VC),
+ safe_strncpy(console, (tried == 0 ? CONSOLE_DEV : CURRENT_VC),
sizeof(console));
tried++;
}
if (fd < 0) {
/* Perhaps we should panic here? */
#ifndef CONFIG_SYSLOGD
- log =
+ log_console =
#endif
- safe_strncpy(console, "/dev/null", sizeof(console));
+ safe_strncpy(console, bb_dev_null, sizeof(console));
} else {
s = getenv("TERM");
/* check for serial console */
if (s == NULL || strcmp(s, "linux") == 0)
putenv("TERM=vt102");
#ifndef CONFIG_SYSLOGD
- log = console;
+ log_console = console;
#endif
} else {
if (s == NULL)
}
}
+/* 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(const struct init_action *a)
{
- struct stat sb;
- int i, junk;
- pid_t pid, pgrp, tmp_pid;
+ int i;
+ pid_t pid;
char *s, *tmpCmd, *cmd[INIT_BUFFS_SIZE], *cmdpath;
char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
sigset_t nmask, omask;
sigprocmask(SIG_BLOCK, &nmask, &omask);
if ((pid = fork()) == 0) {
+
/* Clean up */
close(0);
close(1);
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);
setsid();
/* Open the new terminal device */
- if ((device_open(a->terminal, O_RDWR)) < 0) {
- if (stat(a->terminal, &sb) != 0) {
- message(LOG | CONSOLE, "device '%s' does not exist.",
- a->terminal);
- _exit(1);
- }
- message(LOG | CONSOLE, "Bummer, can't open %s", a->terminal);
- _exit(1);
- }
+ open_new_terminal(a->terminal, 1);
/* Make sure the terminal will act fairly normal for us */
- set_term(0);
+ set_term();
/* Setup stdout, stderr for the new process so
* they point to the supplied terminal */
dup(0);
signal(SIGQUIT, SIG_IGN);
signal(SIGCHLD, SIG_DFL);
- /* Wait for child to exit */
- while ((tmp_pid = waitpid(pid, &junk, 0)) != pid);
-
+ waitfor(NULL, pid);
/* See if stealing the controlling tty back is necessary */
- pgrp = tcgetpgrp(0);
- if (pgrp != getpid())
+ if (tcgetpgrp(0) != getpid())
_exit(0);
/* Use a temporary process to steal the controlling tty. */
ioctl(0, TIOCSCTTY, 1);
_exit(0);
}
- while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
- if (tmp_pid < 0 && errno == ECHILD)
- break;
- }
+ waitfor(NULL, pid);
_exit(0);
}
/* See if any special /bin/sh requiring characters are present */
if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
- cmd[0] = SHELL;
+ cmd[0] = (char *)DEFAULT_SHELL;
cmd[1] = "-c";
cmd[2] = strcat(strcpy(buf, "exec "), a->command);
cmd[3] = NULL;
/*
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").
*/
cmd[0][0] = '-';
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 !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
if (a->action & ASKFIRST) {
char c;
/*
* 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.
*/
messageD(LOG, "Waiting for enter to start '%s'"
"(pid %d, terminal %s)\n",
cmdpath, getpid(), a->terminal);
- bb_full_write(1, press_enter, sizeof(press_enter) - 1);
- while(read(0, &c, 1) == 1 && c != '\n')
+ full_write(1, press_enter, sizeof(press_enter) - 1);
+ while (read(0, &c, 1) == 1 && c != '\n')
;
}
+#endif
/* Log the process name and args */
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. */
execv(cmdpath, cmd);
/* We're still here? Some error happened. */
- message(LOG | CONSOLE, "Bummer, could not run '%s': %m", cmdpath);
+ message(LOG | CONSOLE, "Bummer, cannot run '%s': %m", cmdpath);
_exit(-1);
}
sigprocmask(SIG_SETMASK, &omask, NULL);
return pid;
}
-static int waitfor(const struct init_action *a)
+static int waitfor(const struct init_action *a, pid_t pid)
{
- int pid;
+ int runpid;
int status, wpid;
- pid = run(a);
+ 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;
}
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);
+ 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);
}
}
-#ifndef DEBUG_INIT
+#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);
+}
+
static void shutdown_system(void)
{
sigset_t block_signals;
/* 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);
sync();
/* Send signals to every process _except_ pid 1 */
- message(CONSOLE | LOG, "Sending SIGTERM to all processes.");
+ message(CONSOLE | LOG, init_sending_format, "TERM");
kill(-1, SIGTERM);
sleep(1);
sync();
- message(CONSOLE | LOG, "Sending SIGKILL to all processes.");
+ message(CONSOLE | LOG, init_sending_format, "KILL");
kill(-1, SIGKILL);
sleep(1);
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)
+static void exec_signal(int sig ATTRIBUTE_UNUSED)
{
struct init_action *a, *tmp;
sigset_t unblock_signals;
/* 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, 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);
}
}
-static void halt_signal(int sig)
+static void shutdown_signal(int sig)
{
- shutdown_system();
- message(CONSOLE | LOG,
-#if #cpu(s390)
- /* Seems the s390 console is Wierd(tm). */
- "The system is halted. You may reboot now."
-#else
- "The system is halted. Press Reset or turn off power"
-#endif
- );
- sync();
-
- /* allow time for last message to reach serial console */
- sleep(2);
-
- if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2, 2, 0))
- init_reboot(RB_POWER_OFF);
- else
- init_reboot(RB_HALT_SYSTEM);
-
- loop_forever();
-}
+ char *m;
+ int rb;
-static void reboot_signal(int sig)
-{
shutdown_system();
- message(CONSOLE | LOG, "Please stand by while rebooting the system.");
+
+ 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);
- init_reboot(RB_AUTOBOOT);
+ init_reboot(rb);
loop_forever();
}
-static void ctrlaltdel_signal(int sig)
+static void ctrlaltdel_signal(int sig ATTRIBUTE_UNUSED)
{
run_actions(CTRLALTDEL);
}
/* The SIGSTOP & SIGTSTP handler */
-static void stop_handler(int sig)
+static void stop_handler(int sig ATTRIBUTE_UNUSED)
{
int saved_errno = errno;
}
/* The SIGCONT handler */
-static void cont_handler(int sig)
+static void cont_handler(int sig ATTRIBUTE_UNUSED)
{
got_cont = 1;
}
-#endif /* ! DEBUG_INIT */
+#endif /* ! ENABLE_DEBUG_INIT */
-static void new_init_action(int action, char *command, const char *cons)
+static void new_init_action(int action, const char *command, const char *cons)
{
- struct init_action *new_action, *a;
+ struct init_action *new_action, *a, *last;
if (*cons == '\0')
cons = console;
- /* do not run entries if console device is not available */
- if (access(cons, R_OK | W_OK))
- return;
- if (strcmp(cons, "/dev/null") == 0 && (action & ASKFIRST))
+ if (strcmp(cons, bb_dev_null) == 0 && (action & ASKFIRST))
return;
new_action = calloc((size_t) (1), sizeof(struct init_action));
}
/* Append to the end of the list */
- for (a = init_action_list; a && a->next; a = a->next);
- if (a) {
- a->next = new_action;
+ 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 {
init_action_list = new_action;
}
strcpy(new_action->command, command);
new_action->action = action;
strcpy(new_action->terminal, cons);
-#if 0 /* calloc zeroed always */
- new_action->pid = 0;
-#endif
messageD(LOG|CONSOLE, "command='%s' action='%d' terminal='%s'\n",
new_action->command, new_action->action, new_action->terminal);
}
}
}
-/* Make sure there is enough memory to do something useful. *
- * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
-static void check_memory(void)
-{
- struct stat statBuf;
-
- if (check_free_memory() > 1000)
- return;
-
-#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
- if (stat("/etc/fstab", &statBuf) == 0) {
- /* 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 */
- if (check_free_memory() < 1000)
- goto goodnight;
- } else
- goto goodnight;
- return;
-#endif
-
- goodnight:
- message(CONSOLE, "Sorry, your computer does not have enough memory.");
- loop_forever();
-}
-
/* 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)
new_init_action(CTRLALTDEL, "/sbin/reboot", "");
/* Umount all filesystems on halt/reboot */
new_init_action(SHUTDOWN, "/bin/umount -a -r", "");
-#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
/* Swapoff on halt/reboot */
- new_init_action(SHUTDOWN, "/sbin/swapoff -a", "");
-#endif
+ 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, LOGIN_SHELL, "");
- new_init_action(ASKFIRST, LOGIN_SHELL, VC_2);
- new_init_action(ASKFIRST, LOGIN_SHELL, VC_3);
- new_init_action(ASKFIRST, LOGIN_SHELL, VC_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_init_action(SYSINIT, INIT_SCRIPT, "");
#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)
{
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)
- bb_error_msg_and_die("no process killed");
- }
- return kill(*pid, SIGHUP);
+ return kill(1,SIGHUP);
}
-#ifndef DEBUG_INIT
+#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(bb_applet_name, "linuxrc") == NULL
-#endif
- ) {
+ 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_signal);
- signal(SIGUSR1, halt_signal);
- signal(SIGUSR2, halt_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(2);
if (device_open(console, O_RDWR | O_NOCTTY) == 0) {
- set_term(0);
+ set_term();
close(0);
}
{
const char * const *e;
/* Make sure environs is set to something sane */
- for(e = environment; *e; e++)
+ for (e = environment; *e; e++)
putenv((char *) *e);
}
+
+ if (argc > 1) setenv("RUNLEVEL", argv[1], 1);
+
/* Hello world */
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 < 1024*1024)
+ {
+ 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"))) {
+ 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, LOGIN_SHELL, "");
+ 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");
/* Next run anything to be run only once */
run_actions(ONCE);
- /* If there is nothing else to do, stop */
- if (init_action_list == NULL) {
- message(LOG | CONSOLE,
- "No more tasks for init -- sleeping forever.");
- loop_forever();
- }
+#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) {
sleep(1);
/* Wait for a child process to exit */
- wpid = wait(&status);
+ wpid = wait(NULL);
while (wpid > 0) {
/* Find out who died and clean up their corpse */
for (a = init_action_list; a; a = a->next) {
}
}
/* see if anyone else is waiting to be reaped */
- wpid = waitpid (-1, &status, WNOHANG);
+ wpid = waitpid(-1, NULL, WNOHANG);
}
}
}
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff