* Mini init implementation for busybox
*
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
- * Copyright (C) 1999-200
3 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 1999-200
4 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
+/* Turn this on to disable all the dangerous
rebooting stuff when debugging.
#define DEBUG_INIT
*/
#include <termios.h>
#include <unistd.h>
#include <limits.h>
-#include <sys/fcntl.h>
+#include <fcntl.h>
#include <sys/ioctl.h>
-#include <sys/mount.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/reboot.h>
#endif
-#if defined(__UCLIBC__) && !defined(__UCLIBC_HAS_MMU__)
-#define fork vfork
-#endif
+#ifdef CONFIG_SELINUX
+# include <selinux/selinux.h>
+#endif /* CONFIG_SELINUX */
+
#define INIT_BUFFS_SIZE 256
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 {
#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....
static char console[CONSOLE_BUFF_SIZE] = _PATH_CONSOLE;
#ifndef CONFIG_SYSLOGD
-static char *log = VC_5;
+static char *log_console = VC_5;
#endif
static sig_atomic_t got_cont = 0;
-static const int LOG = 0x1;
-static const int CONSOLE = 0x2;
+
+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,
+ RB_ENABLE_CAD = 0x89abcdef,
+ RB_DISABLE_CAD = 0,
+ RB_POWER_OFF = 0x4321fedc,
+ RB_AUTOBOOT = 0x01234567,
#endif
+};
static const char * const environment[] = {
"HOME=/",
/* 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, ...)
+static inline void messageD(int ATTRIBUTE_UNUSED device,
+ const char ATTRIBUTE_UNUSED *fmt, ...)
{
}
#else
/* Log the message to syslogd */
if (device & LOG) {
/* don`t out "\r\n" */
- syslog_msg(LOG_DAEMON, LOG_INFO, msg + 1);
+ openlog(bb_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 & CONSOLE) {
int fd = device_open(_PATH_CONSOLE,
- O_WRONLY | O_NOCTTY | O_NDELAY);
+ 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);
tcsetattr(fd, TCSANOW, &tty);
}
-/* How much memory does this machine have?
- Units are kBytes to avoid overflow on 4GB machines */
-static unsigned 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);
- if ((unsigned long long) (result * u) > UINT_MAX) {
- return(UINT_MAX);
- } else {
- return(result * u);
- }
-}
-
static void console_init(void)
{
int fd;
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
+ /* 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)
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)
static pid_t run(const struct init_action *a)
{
- struct stat sb;
int i, junk;
- pid_t pid, pgrp, tmp_pid;
+ 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) {
+ struct stat sb;
+
/* 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);
/* 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, "device '%s' does not exist.", a->terminal);
+ } else {
+ message(LOG | CONSOLE, "Bummer, can't open %s", a->terminal);
}
- message(LOG | CONSOLE, "Bummer, can't open %s", a->terminal);
_exit(1);
}
/* 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)) {
+ pid_t pgrp, tmp_pid;
/* Now fork off another process to just hang around */
if ((pid = fork()) < 0) {
signal(SIGCHLD, SIG_DFL);
/* Wait for child to exit */
- while ((tmp_pid = waitpid(pid, &junk, 0)) != pid);
+ while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
+ if (tmp_pid == -1 && errno == ECHILD) {
+ break;
+ }
+ /* FIXME handle other errors */
+ }
/* See if stealing the controlling tty back is necessary */
pgrp = tcgetpgrp(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
+ 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'"
while(read(0, &c, 1) == 1 && c != '\n')
;
}
+#endif
/* Log the process name and args */
message(LOG, "Starting pid %d, console %s: '%s'",
}
#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);
pid = run(a);
while (1) {
- wpid = wait(&status);
- if (wpid > 0 && wpid != pid) {
- continue;
- }
+ wpid = waitpid(pid,&status,0);
if (wpid == pid)
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)) {
+ if (access(a->terminal, R_OK | W_OK)) {
+ delete_init_action(a);
+ } else if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
waitfor(a);
delete_init_action(a);
} else if (a->action & ONCE) {
{
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
+ * linux/kernel/sys.c, which can cause the machine to panic when
* the init process is killed.... */
if ((pid = fork()) == 0) {
reboot(magic);
/* 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();
}
-static void exec_signal(int sig)
+static void exec_signal(int sig ATTRIBUTE_UNUSED)
{
struct init_action *a, *tmp;
sigset_t unblock_signals;
for (a = init_action_list; a; a = tmp) {
tmp = a->next;
if (a->action & RESTART) {
- struct stat sb;
-
shutdown_system();
/* unblock all signals, blocked in shutdown_system() */
sigemptyset(&unblock_signals);
sigaddset(&unblock_signals, SIGHUP);
+ sigaddset(&unblock_signals, SIGQUIT);
sigaddset(&unblock_signals, SIGCHLD);
sigaddset(&unblock_signals, SIGUSR1);
sigaddset(&unblock_signals, SIGUSR2);
/* Open the new terminal device */
if ((device_open(a->terminal, O_RDWR)) < 0) {
+ struct stat sb;
if (stat(a->terminal, &sb) != 0) {
message(LOG | CONSOLE, "device '%s' does not exist.", a->terminal);
} else {
}
}
-static void halt_signal(int sig)
+static void halt_signal(int sig ATTRIBUTE_UNUSED)
{
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
- );
+ message(CONSOLE | LOG, "The system is halted.");
sync();
/* allow time for last message to reach serial console */
loop_forever();
}
-static void reboot_signal(int sig)
+static void reboot_signal(int sig ATTRIBUTE_UNUSED)
{
shutdown_system();
message(CONSOLE | LOG, "Please stand by while rebooting the system.");
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;
}
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) {
- /* don't enter action if it's already in the list */
- if ((strcmp(a->command, command) == 0) &&
+ 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 (a) {
- a->next = new_action;
+ if (last) {
+ last->next = new_action;
} else {
init_action_list = new_action;
}
}
}
-/* 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 */
#endif /* CONFIG_FEATURE_USE_INITTAB */
}
-static void reload_signal(int sig)
+#ifdef CONFIG_FEATURE_USE_INITTAB
+static void reload_signal(int sig ATTRIBUTE_UNUSED)
{
- message(LOG, "Reloading /etc/inittab");
- parse_inittab();
+ 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;
+ return;
}
-
-extern int init_main(int argc, char **argv)
+#endif /* CONFIG_FEATURE_USE_INITTAB */
+
+int init_main(int argc, char **argv)
{
struct init_action *a;
pid_t wpid;
int status;
if (argc > 1 && !strcmp(argv[1], "-q")) {
- return kill_init(SIGHUP);
+ return kill(1,SIGHUP);
}
#ifndef 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(bb_applet_name, "linuxrc")))
+ {
bb_show_usage();
}
/* Set up sig handlers -- be sure to
* clear all of these in run() */
signal(SIGHUP, exec_signal);
+ signal(SIGQUIT, exec_signal);
signal(SIGUSR1, halt_signal);
signal(SIGUSR2, halt_signal);
signal(SIGINT, ctrlaltdel_signal);
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
message(MAYBE_CONSOLE | LOG, "init started: %s", bb_msg_full_version);
/* Make sure there is enough memory to do something useful. */
- check_memory();
+ if (ENABLE_SWAPONOFF) {
+ struct sysinfo info;
+
+ if (!sysinfo(&info) &&
+ (info.mem_unit ? : 1) * (long long)info.totalram < MEGABYTE)
+ {
+ message(CONSOLE,"Low memory: forcing swapon.");
+ /* swapon -a requires /proc typically */
+ new_init_action(SYSINIT, "/bin/mount -t proc proc /proc", "");
+ /* Try to turn on swap */
+ new_init_action(SYSINIT, "/sbin/swapon -a", "");
+ run_actions(SYSINIT); /* wait and removing */
+ }
+ }
/* Check if we are supposed to be in single user mode */
if (argc > 1 && (!strcmp(argv[1], "single") ||
/* 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) {
projects / oweals / busybox.git / blobdiff