#define DEBUG_INIT
*/
-#include "busybox.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.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
-#define bb_need_full_version
-#define BB_DECLARE_EXTERN
-#include "messages.c"
/* From <linux/vt.h> */
struct vt_stat {
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>
+#endif
+
+#if __GNU_LIBRARY__ > 5
+ #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"
#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__ */
+ extern int bdflush (int func, long int data);
+#endif
#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
#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;
ASKFIRST,
WAIT,
ONCE,
- CTRLALTDEL
+ CTRLALTDEL,
+ SHUTDOWN
} initActionEnum;
/* A mapping between "inittab" action name strings and action type codes. */
{"wait", WAIT},
{"once", ONCE},
{"ctrlaltdel", CTRLALTDEL},
+ {"shutdown", SHUTDOWN},
{0, 0}
};
initAction *nextPtr;
initActionEnum action;
};
-initAction *initActionList = NULL;
+static initAction *initActionList = NULL;
static char *secondConsole = VT_SECONDARY;
static void delete_initAction(initAction * action);
+
/* Print a message to the specified device.
* Device may be bitwise-or'd from LOG | CONSOLE */
static void message(int device, char *fmt, ...)
}
/* Set terminal settings to reasonable defaults */
-void set_term(int fd)
+static void set_term(int fd)
{
struct termios tty;
}
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++;
+ }
+}
+
static pid_t run(char *command, char *terminal, int get_enter)
{
- int i, fd;
+ int i, j;
+ int fd;
pid_t pid;
- char *tmpCmd;
- char *cmd[255], *cmdpath;
+ char *tmpCmd, *s;
+ char *cmd[255], *cmdpath;
char buf[255];
+ struct stat sb;
static const char press_enter[] =
#ifdef CUSTOMIZED_BANNER
#endif
"\nPlease press Enter to activate this console. ";
- char *environment[] = {
+ char *environment[MAXENV+1] = {
+ termType,
"HOME=/",
"PATH=/usr/bin:/bin:/usr/sbin:/sbin",
"SHELL=/bin/sh",
- termType,
"USER=root",
- 0
+ NULL
};
+ /* inherit environment to the child, merging our values -andy */
+ for (i=0; environ[i]; i++) {
+ for (j=0; environment[j]; j++) {
+ s = strchr(environment[j], '=');
+ if (!strncmp(environ[i], environment[j], s - environment[j]))
+ break;
+ }
+ if (!environment[j]) {
+ environment[j++] = environ[i];
+ environment[j] = NULL;
+ }
+ }
+
if ((pid = fork()) == 0) {
/* Clean up */
ioctl(0, TIOCNOTTY, 0);
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);
}
tcsetpgrp(0, getpgrp());
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);
- }
-
-#ifdef DEBUG_INIT
- /* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '%s'\r\n",
- shell_pgid, terminal, command);
-#endif
-
/* See if any special /bin/sh requiring characters are present */
if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
cmd[0] = SHELL;
} else {
/* Convert command (char*) into cmd (char**, one word per string) */
for (tmpCmd = command, i = 0;
- (tmpCmd = strsep(&command, " \t")) != NULL;) {
+ (tmpCmd = strsep(&command, " \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;
+ if (*cmdpath == '-') {
- /* skip over the dash */
- ++cmdpath;
+ /* skip over the dash */
+ ++cmdpath;
- /* find the last component in the command pathname */
- s = get_last_path_component(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);
- }
- }
+ /* 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
#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 (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));
+ /* We're still here? Some error happened. */
+ message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
+ strerror(errno));
exit(-1);
}
return pid;
}
/* Run all commands to be run right before halt/reboot */
-static void run_lastAction(void)
+static void run_actions(initActionEnum action)
{
- initAction *a;
- for (a = initActionList; a; a = a->nextPtr) {
- if (a->action == CTRLALTDEL) {
+ 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);
}
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)) {
exit(0);
}
-#if defined BB_FEATURE_INIT_CHROOT
-
-#warning BB_FEATURE_INIT_CHROOT is out of date and should be rewritten to us
-#warning pivot root instead. Do not even bother till this work is done...
-#warning You have been warned.
-
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
-#endif
-
-static void check_chroot(int sig)
+static void ctrlaltdel_signal(int sig)
{
- char *argv_init[2] = { "init", NULL, };
- char *envp_init[3] = { "HOME=/", "TERM=linux", NULL, };
- char rootpath[256], *tc;
- int fd;
-
- if ((fd = open("/proc/sys/kernel/init-chroot", O_RDONLY)) == -1) {
- message(CONSOLE,
- "SIGHUP recived, but could not open proc file\r\n");
- sleep(2);
- return;
- }
- if (read(fd, rootpath, sizeof(rootpath)) == -1) {
- message(CONSOLE,
- "SIGHUP recived, but could not read proc file\r\n");
- sleep(2);
- return;
- }
- close(fd);
-
- if (rootpath[0] == '\0') {
- message(CONSOLE,
- "SIGHUP recived, but new root is not valid: %s\r\n",
- rootpath);
- sleep(2);
- return;
- }
-
- tc = strrchr(rootpath, '\n');
- *tc = '\0';
-
- /* Ok, making it this far means we commit */
- message(CONSOLE, "Please stand by, changing root to `%s'.\r\n",
- rootpath);
-
- /* kill all other programs first */
- message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
- kill(-1, SIGTERM);
- sleep(2);
- sync();
-
- message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
- kill(-1, SIGKILL);
- sleep(2);
- sync();
-
- /* ok, we don't need /proc anymore. we also assume that the signaling
- * process left the rest of the filesystems alone for us */
- umount("/proc");
-
- /* Ok, now we chroot. Hopefully we only have two things mounted, the
- * new chroot'd mount point, and the old "/" mount. s,
- * we go ahead and unmount the old "/". This should trigger the kernel
- * to set things up the Right Way(tm). */
-
- if (!chroot(rootpath))
- umount("/dev/root");
-
- /* If the chroot fails, we are already too far to turn back, so we
- * continue and hope that executing init below will revive the system */
-
- /* close all of our descriptors and open new ones */
- close(0);
- close(1);
- close(2);
- open("/dev/console", O_RDWR, 0);
- dup(0);
- dup(0);
-
- message(CONSOLE, "Executing real init...\r\n");
- /* execute init in the (hopefully) new root */
- execve("/sbin/init", argv_init, envp_init);
-
- message(CONSOLE,
- "ERROR: Could not exec new init. Press %s to reboot.\r\n",
- (secondConsole == NULL) /* serial console */
- ? "Reset" : "CTRL-ALT-DEL");
- return;
+ run_actions(CTRLALTDEL);
}
-#endif /* BB_FEATURE_INIT_CHROOT */
#endif /* ! DEBUG_INIT */
-void new_initAction(initActionEnum action, char *process, char *cons)
+static void new_initAction(initActionEnum action, char *process, char *cons)
{
initAction *newAction;
* _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
FILE *file;
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(CTRLALTDEL, "/sbin/swapoff -a", console);
+ new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
/* Umount all filesystems on halt/reboot */
- new_initAction(CTRLALTDEL, "/bin/umount -a -r", console);
+ new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
/* Askfirst shell on tty1 */
new_initAction(ASKFIRST, SHELL, console);
/* Askfirst shell on tty2 */
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);
extern int init_main(int argc, char **argv)
{
- initAction *a;
+ initAction *a, *tmp;
pid_t wpid;
int status;
#endif
)
{
- usage("init\n\nInit is the parent of all processes.\n\n"
- "This version of init is designed to be run only "
- "by the kernel.");
+ show_usage();
}
/* Set up sig handlers -- be sure to
* clear all of these in run() */
signal(SIGUSR1, halt_signal);
signal(SIGUSR2, halt_signal);
- signal(SIGINT, reboot_signal);
+ signal(SIGINT, ctrlaltdel_signal);
signal(SIGTERM, reboot_signal);
-#if defined BB_FEATURE_INIT_CHROOT
- signal(SIGHUP, check_chroot);
-#endif
/* Turn off rebooting via CTL-ALT-DEL -- we get a
* SIGINT on CAD so we can shut things down gracefully... */
setsid();
/* Make sure PATH is set to something sane */
- putenv(_PATH_STDPATH);
+ putenv("PATH="_PATH_STDPATH);
/* Hello world */
#ifndef DEBUG_INIT
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) {
+ 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 */
}
}
/* Next run anything that wants to block */
- for (a = initActionList; a; a = a->nextPtr) {
+ 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 */
}
}
/* Next run anything to be run only once */
- for (a = initActionList; a; a = a->nextPtr) {
+ 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 */