*
*/
-#include "internal.h"
+/* Turn this on to disable all the dangerous
+ rebooting stuff when debugging.
+#define DEBUG_INIT
+*/
+
#include <stdio.h>
-#include <string.h>
#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
#include <errno.h>
+#include <paths.h>
#include <signal.h>
+#include <stdarg.h>
+#include <string.h>
#include <termios.h>
-#include <paths.h>
-#include <sys/types.h>
+#include <unistd.h>
+#include <limits.h>
#include <sys/fcntl.h>
-#include <sys/wait.h>
-#include <string.h>
-#include <sys/mount.h>
-#include <sys/reboot.h>
-#include <sys/kdaemon.h>
-#include <sys/sysmacros.h>
-#include <asm/types.h>
-#include <linux/serial.h> /* for serial_struct */
-#include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h>
-#include <linux/version.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>
+# include <sys/syslog.h>
+#endif
+
+
+/* From <linux/vt.h> */
+struct vt_stat {
+ unsigned short v_active; /* active vt */
+ unsigned short v_signal; /* signal to send */
+ unsigned short v_state; /* vt bitmask */
+};
+static const int VT_GETSTATE = 0x5603; /* get global vt state info */
+
+/* From <linux/serial.h> */
+struct serial_struct {
+ int type;
+ int line;
+ int port;
+ int irq;
+ int flags;
+ int xmit_fifo_size;
+ int custom_divisor;
+ int baud_base;
+ unsigned short close_delay;
+ char reserved_char[2];
+ int hub6;
+ unsigned short closing_wait; /* time to wait before closing */
+ unsigned short closing_wait2; /* no longer used... */
+ int reserved[4];
+};
+
+
+
+#ifndef RB_HALT_SYSTEM
+static const int RB_HALT_SYSTEM = 0xcdef0123;
+static const int RB_ENABLE_CAD = 0x89abcdef;
+static const int RB_DISABLE_CAD = 0;
+#define RB_POWER_OFF 0x4321fedc
+static const int RB_AUTOBOOT = 0x01234567;
+#if defined(__GLIBC__) || defined (__UCLIBC__)
+#include <sys/reboot.h>
+ #define init_reboot(magic) reboot(magic)
+#else
+ #define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
+#endif
#endif
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
+#ifndef _PATH_STDPATH
+#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
#endif
-#ifndef KERNEL_VERSION
-#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+
+#if defined BB_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.
+ * 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))
-#define VT_PRIMARY "/dev/tty1" /* Primary virtual console */
-#define VT_SECONDARY "/dev/tty2" /* Virtual console */
-#define VT_LOG "/dev/tty3" /* Virtual console */
-#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
-#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
-#define SHELL "/bin/sh" /* Default shell */
-#define INITTAB "/etc/inittab" /* inittab file location */
+#if defined(__GLIBC__)
+#include <sys/kdaemon.h>
+#else
+extern int bdflush (int func, long 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 */
+#define INITTAB "/etc/inittab" /* inittab file location */
#ifndef INIT_SCRIPT
-#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
+#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
#endif
-#define LOG 0x1
-#define CONSOLE 0x2
+#define MAXENV 16 /* Number of env. vars */
+//static const int MAXENV = 16; /* Number of env. vars */
+static const int LOG = 0x1;
+static const int CONSOLE = 0x2;
/* Allowed init action types */
typedef enum {
RESPAWN,
ASKFIRST,
WAIT,
- ONCE
+ ONCE,
+ CTRLALTDEL,
+ SHUTDOWN
} initActionEnum;
-/* And now a list of the actions we support in the version of init */
+/* A mapping between "inittab" action name strings and action type codes. */
typedef struct initActionType {
const char *name;
initActionEnum action;
{"askfirst", ASKFIRST},
{"wait", WAIT},
{"once", ONCE},
- {0}
+ {"ctrlaltdel", CTRLALTDEL},
+ {"shutdown", SHUTDOWN},
+ {0, 0}
};
-/* Set up a linked list of initactions, to be read from inittab */
+/* Set up a linked list of initActions, to be read from inittab */
typedef struct initActionTag initAction;
struct initActionTag {
pid_t pid;
initAction *nextPtr;
initActionEnum action;
};
-initAction *initActionList = NULL;
+static initAction *initActionList = NULL;
static char *secondConsole = VT_SECONDARY;
-static char *log = VT_LOG;
-static int kernelVersion = 0;
-static char termType[32] = "TERM=ansi";
-static char console[32] = _PATH_CONSOLE;
+static char *thirdConsole = VT_THIRD;
+static char *fourthConsole = VT_FOURTH;
+static char *log = VT_LOG;
+static int kernelVersion = 0;
+static char termType[32] = "TERM=linux";
+static char console[32] = _PATH_CONSOLE;
+
+static void delete_initAction(initAction * action);
+
-/* print a message to the specified device:
- * device may be bitwise-or'd from LOG | CONSOLE */
-void message(int device, char *fmt, ...)
+/* Print a message to the specified device.
+ * Device may be bitwise-or'd from LOG | CONSOLE */
+static void message(int device, char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+static void message(int device, char *fmt, ...)
{
va_list arguments;
int fd;
va_start(arguments, fmt);
vsnprintf(msg, sizeof(msg), fmt, arguments);
va_end(arguments);
- openlog("init", 0, LOG_DAEMON);
- syslog(LOG_DAEMON | LOG_NOTICE, msg);
+ openlog(applet_name, 0, LOG_USER);
+ syslog(LOG_USER|LOG_INFO, msg);
closelog();
}
#else
log_fd = -2;
/* log to main console instead */
device = CONSOLE;
- } else if ((log_fd = device_open(log, O_RDWR | O_NDELAY)) < 0) {
- log_fd = -1;
+ } 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);
- fflush(stderr);
- return;
+ log = NULL;
+ device = CONSOLE;
}
}
if ((device & LOG) && (log_fd >= 0)) {
fprintf(stderr, "Bummer, can't print: ");
va_start(arguments, fmt);
vfprintf(stderr, fmt, arguments);
- fflush(stderr);
va_end(arguments);
}
}
}
-
/* Set terminal settings to reasonable defaults */
-void set_term(int fd)
+static void set_term(int fd)
{
struct termios tty;
- static const char control_characters[] = {
- '\003', '\034', '\177', '\025', '\004', '\0',
- '\1', '\0', '\021', '\023', '\032', '\0', '\022',
- '\017', '\027', '\026', '\0'
- };
tcgetattr(fd, &tty);
/* set control chars */
- memcpy(tty.c_cc, control_characters, sizeof(control_characters));
+ tty.c_cc[VINTR] = 3; /* C-c */
+ tty.c_cc[VQUIT] = 28; /* C-\ */
+ tty.c_cc[VERASE] = 127; /* C-? */
+ tty.c_cc[VKILL] = 21; /* C-u */
+ tty.c_cc[VEOF] = 4; /* C-d */
+ tty.c_cc[VSTART] = 17; /* C-q */
+ tty.c_cc[VSTOP] = 19; /* C-s */
+ tty.c_cc[VSUSP] = 26; /* C-z */
/* use line dicipline 0 */
tty.c_line = 0;
/* Make it be sane */
- //tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
- //tty.c_cflag |= HUPCL|CLOCAL;
+ tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
+ tty.c_cflag |= HUPCL|CLOCAL;
/* input modes */
tty.c_iflag = ICRNL | IXON | IXOFF;
tcsetattr(fd, TCSANOW, &tty);
}
-/* How much memory does this machine have? */
-static int mem_total()
+/* How much memory does this machine have?
+ Units are kBytes to avoid overflow on 4GB machines */
+static int check_free_memory()
{
- char s[80];
- char *p = "/proc/meminfo";
- FILE *f;
- const char pattern[] = "MemTotal:";
+ struct sysinfo info;
+ unsigned int result, u, s=10;
- if ((f = fopen(p, "r")) < 0) {
- message(LOG, "Error opening %s: %s\n", p, strerror(errno));
+ if (sysinfo(&info) != 0) {
+ perror_msg("Error checking free memory");
return -1;
}
- while (NULL != fgets(s, 79, f)) {
- p = strstr(s, pattern);
- if (NULL != p) {
- fclose(f);
- return (atoi(p + strlen(pattern)));
- }
- }
- 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;
}
static void console_init()
int fd;
int tried_devcons = 0;
int tried_vtprimary = 0;
+ struct vt_stat vt;
struct serial_struct sr;
char *s;
}
#endif
else {
- struct vt_stat vt;
-
/* 2.2 kernels: identify the real console backend and try to use it */
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
/* this is a serial console */
/* Perhaps we should panic here? */
snprintf(console, sizeof(console) - 1, "/dev/null");
} else {
- /* check for serial console and disable logging to tty3 & running a
- * shell to tty2 */
+ /* check for serial console and disable logging to tty5 & running a
+ * shell to tty2-4 */
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
- message(LOG | CONSOLE,
- "serial console detected. Disabling virtual terminals.\r\n");
log = NULL;
secondConsole = NULL;
+ thirdConsole = NULL;
+ fourthConsole = NULL;
+ /* Force the TERM setting to vt102 for serial console --
+ * iff TERM is set to linux (the default) */
+ if (strcmp( termType, "TERM=linux" ) == 0)
+ snprintf(termType, sizeof(termType) - 1, "TERM=vt102");
+ message(LOG | CONSOLE,
+ "serial console detected. Disabling virtual terminals.\r\n");
}
close(fd);
}
message(LOG, "console=%s\n", console);
}
+
+static void fixup_argv(int argc, char **argv, char *new_argv0)
+{
+ int len;
+ /* Fix up argv[0] to be certain we claim to be init */
+ len = strlen(argv[0]);
+ memset(argv[0], 0, len);
+ strncpy(argv[0], new_argv0, len);
+
+ /* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
+ len = 1;
+ while (argc > len) {
+ memset(argv[len], 0, strlen(argv[len]));
+ len++;
+ }
+}
+
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];
+ char *tmpCmd, *s;
+ char *cmd[255], *cmdpath;
+ char buf[255];
+ struct stat sb;
static const char press_enter[] =
+#ifdef CUSTOMIZED_BANNER
+#include CUSTOMIZED_BANNER
+#endif
+
"\nPlease press Enter to activate this console. ";
- char *environment[] = {
+ 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) {
- pid_t shell_pgid = getpid();
-
/* Clean up */
+ ioctl(0, TIOCNOTTY, 0);
close(0);
close(1);
close(2);
signal(SIGHUP, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
+ if (stat(terminal, &sb) != 0) {
+ message(LOG | CONSOLE, "device '%s' does not exist.\n",
+ terminal);
+ exit(1);
+ }
message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
exit(1);
}
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
+ ioctl(0, TIOCSCTTY, 1);
tcsetpgrp(0, getpgrp());
set_term(0);
+ /* See if any special /bin/sh requiring characters are present */
+ if (strpbrk(command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
+ cmd[0] = SHELL;
+ cmd[1] = "-c";
+ strcpy(buf, "exec ");
+ strncat(buf, command, sizeof(buf) - strlen(buf) - 1);
+ cmd[2] = buf;
+ cmd[3] = NULL;
+ } else {
+ /* Convert command (char*) into cmd (char**, one word per string) */
+ for (tmpCmd = command, i = 0;
+ (tmpCmd = strsep(&command, " \t")) != NULL;) {
+ if (*tmpCmd != '\0') {
+ cmd[i] = tmpCmd;
+ tmpCmd++;
+ i++;
+ }
+ }
+ cmd[i] = NULL;
+ }
+
+ cmdpath = cmd[0];
+
+ /*
+ Interactive shells want to see a dash in argv[0]. This
+ typically is handled by login, argv will be setup this
+ way if a dash appears at the front of the command path
+ (like "-/bin/sh").
+ */
+
+ if (*cmdpath == '-') {
+
+ /* skip over the dash */
+ ++cmdpath;
+
+ /* find the last component in the command pathname */
+ s = get_last_path_component(cmdpath);
+
+ /* make a new argv[0] */
+ if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
+ message(LOG | CONSOLE, "malloc failed");
+ cmd[0] = cmdpath;
+ } else {
+ cmd[0][0] = '-';
+ strcpy(cmd[0]+1, s);
+ }
+ }
+
if (get_enter == TRUE) {
/*
* Save memory by not exec-ing anything large (like a shell)
* be allowed to start a shell or whatever an init script
* specifies.
*/
- char c;
-
+#ifdef DEBUG_INIT
message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
- command, shell_pgid, terminal);
+ cmd[0], getpid(), terminal);
+#endif
write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
- read(fileno(stdin), &c, 1);
+ getc(stdin);
}
- /* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '",
- shell_pgid, terminal, command);
-
- /* Convert command (char*) into cmd (char**, one word per string) */
- for (tmpCmd = command, i = 0;
- (tmpCmd = strsep(&command, " \t")) != NULL;) {
- if (*tmpCmd != '\0') {
- cmd[i] = tmpCmd;
#ifdef DEBUG_INIT
- message(LOG, "%s ", tmpCmd);
+ /* Log the process name and args */
+ message(LOG, "Starting pid %d, console %s: '%s'\r\n",
+ getpid(), terminal, command);
#endif
- tmpCmd++;
- i++;
- }
+
+#if defined BB_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);
}
- cmd[i] = NULL;
- message(LOG, "'\r\n");
+#endif
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
- execve(cmd[0], cmd, environment);
+ execve(cmdpath, cmd, environment);
/* We're still here? Some error happened. */
- message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0],
+ message(LOG | CONSOLE, "Bummer, could not run '%s': %s\n", cmdpath,
strerror(errno));
exit(-1);
}
while (1) {
wpid = wait(&status);
- if (wpid > 0) {
- message(LOG, "Process '%s' (pid %d) exited.\n", command, wpid);
- break;
+ if (wpid > 0 && wpid != pid) {
+ continue;
}
if (wpid == pid)
break;
}
/* Make sure there is enough memory to do something useful. *
- * Calls swapon if needed so be sure /proc is mounted. */
+ * Calls "swapon -a" if needed so be sure /etc/fstab is present... */
static void check_memory()
{
struct stat statBuf;
- if (mem_total() > 3500)
+ 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("/bin/swapon swapon -a", log, FALSE);
- if (mem_total() < 3500)
+ waitfor("swapon -a", console, FALSE);
+ if (check_free_memory() < 1000)
goto goodnight;
} else
goto goodnight;
sleep(1);
}
+/* Run all commands to be run right before halt/reboot */
+static void run_actions(initActionEnum action)
+{
+ initAction *a, *tmp;
+ for (a = initActionList; a; a = tmp) {
+ tmp = a->nextPtr;
+ if (a->action == action) {
+ waitfor(a->process, a->console, FALSE);
+ delete_initAction(a);
+ }
+ }
+}
+
+
#ifndef DEBUG_INIT
static void shutdown_system(void)
{
+
/* first disable our SIGHUP signal */
signal(SIGHUP, SIG_DFL);
/* Allow Ctrl-Alt-Del to reboot system. */
- reboot(RB_ENABLE_CAD);
- message(CONSOLE, "\r\nThe system is going down NOW !!\r\n");
+ init_reboot(RB_ENABLE_CAD);
+
+ message(CONSOLE|LOG, "\r\nThe system is going down NOW !!\r\n");
sync();
/* Send signals to every process _except_ pid 1 */
- message(CONSOLE, "Sending SIGTERM to all processes.\r\n");
+ message(CONSOLE|LOG, "Sending SIGTERM to all processes.\r\n");
kill(-1, SIGTERM);
- sleep(5);
+ sleep(1);
sync();
- message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
+ message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
kill(-1, SIGKILL);
- sleep(5);
+ sleep(1);
+
+ /* run everything to be run at "ctrlaltdel" */
+ run_actions(SHUTDOWN);
- message(CONSOLE, "Disabling swap.\r\n");
- waitfor("swapoff -a", console, FALSE);
- message(CONSOLE, "Unmounting filesystems.\r\n");
- waitfor("umount -a -r", console, FALSE);
sync();
- if (kernelVersion > 0 && kernelVersion <= 2 * 65536 + 2 * 256 + 11) {
+ if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
bdflush(1, 0);
sync();
static void halt_signal(int sig)
{
shutdown_system();
- message(CONSOLE,
+ message(CONSOLE|LOG,
"The system is halted. Press %s or turn off power\r\n",
(secondConsole == NULL) /* serial console */
? "Reset" : "CTRL-ALT-DEL");
sync();
/* allow time for last message to reach serial console */
- sleep(5);
+ sleep(2);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
- if (sig == SIGUSR2)
- reboot(RB_POWER_OFF);
+ if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
+ init_reboot(RB_POWER_OFF);
else
-#endif
- reboot(RB_HALT_SYSTEM);
+ init_reboot(RB_HALT_SYSTEM);
exit(0);
}
static void reboot_signal(int sig)
{
shutdown_system();
- message(CONSOLE, "Please stand by while rebooting the system.\r\n");
+ message(CONSOLE|LOG, "Please stand by while rebooting the system.\r\n");
sync();
/* allow time for last message to reach serial console */
sleep(2);
- reboot(RB_AUTOBOOT);
+ init_reboot(RB_AUTOBOOT);
exit(0);
}
-#if defined BB_FEATURE_INIT_CHROOT
-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;
// newAction->process, newAction->action, newAction->console);
}
-void delete_initAction(initAction * action)
+static void delete_initAction(initAction * action)
{
initAction *a, *b = NULL;
* _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;
char buf[256], lineAsRead[256], tmpConsole[256];
- char *p, *q, *r, *s;
+ char *id, *runlev, *action, *process, *eol;
const struct initActionType *a = actions;
int foundIt;
if (file == NULL) {
/* No inittab file -- set up some default behavior */
#endif
+ /* Reboot on Ctrl-Alt-Del */
+ new_initAction(CTRLALTDEL, "/sbin/reboot", console);
+ /* Swapoff on halt/reboot */
+ new_initAction(SHUTDOWN, "/sbin/swapoff -a", console);
+ /* Umount all filesystems on halt/reboot */
+ new_initAction(SHUTDOWN, "/bin/umount -a -r", console);
/* Askfirst shell on tty1 */
new_initAction(ASKFIRST, SHELL, console);
/* Askfirst shell on tty2 */
if (secondConsole != NULL)
new_initAction(ASKFIRST, SHELL, secondConsole);
+ /* Askfirst shell on tty3 */
+ if (thirdConsole != NULL)
+ new_initAction(ASKFIRST, SHELL, thirdConsole);
+ /* Askfirst shell on tty4 */
+ if (fourthConsole != NULL)
+ new_initAction(ASKFIRST, SHELL, fourthConsole);
/* sysinit */
new_initAction(SYSINIT, INIT_SCRIPT, console);
while (fgets(buf, 255, file) != NULL) {
foundIt = FALSE;
- for (p = buf; *p == ' ' || *p == '\t'; p++);
- if (*p == '#' || *p == '\n')
+ /* Skip leading spaces */
+ for (id = buf; *id == ' ' || *id == '\t'; id++);
+
+ /* Skip the line if it's a comment */
+ if (*id == '#' || *id == '\n')
continue;
/* Trim the trailing \n */
- q = strrchr(p, '\n');
- if (q != NULL)
- *q = '\0';
+ eol = strrchr(id, '\n');
+ if (eol != NULL)
+ *eol = '\0';
/* Keep a copy around for posterity's sake (and error msgs) */
strcpy(lineAsRead, buf);
- /* Grab the ID field */
- s = p;
- p = strchr(p, ':');
- if (p != NULL || *(p + 1) != '\0') {
- *p = '\0';
- ++p;
+ /* 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);
+ continue;
+ } else {
+ *runlev = '\0';
+ ++runlev;
}
- /* Now peal off the process field from the end
- * of the string */
- q = strrchr(p, ':');
- if (q == NULL || *(q + 1) == '\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);
continue;
} else {
- *q = '\0';
- ++q;
+ *action = '\0';
+ ++action;
}
- /* Now peal off the action field */
- r = strrchr(p, ':');
- if (r == NULL || *(r + 1) == '\0') {
+ /* Separate the action from the process */
+ process = strchr(action, ':');
+ if (process == NULL || *(process + 1) == '\0') {
message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
continue;
} else {
- ++r;
+ *process = '\0';
+ ++process;
}
/* Ok, now process it */
a = actions;
while (a->name != 0) {
- if (strcmp(a->name, r) == 0) {
- if (*s != '\0') {
- struct stat statBuf;
-
+ if (strcmp(a->name, action) == 0) {
+ if (*id != '\0') {
strcpy(tmpConsole, "/dev/");
- strncat(tmpConsole, s, 200);
- if (stat(tmpConsole, &statBuf) != 0) {
- message(LOG | CONSOLE,
- "device '%s' does not exist. Did you read the directions?\n",
- tmpConsole);
- break;
- }
- s = tmpConsole;
+ strncat(tmpConsole, id, 200);
+ id = tmpConsole;
}
- new_initAction(a->action, q, s);
+ new_initAction(a->action, process, id);
foundIt = TRUE;
}
a++;
}
}
return;
-#endif
+#endif /* BB_FEATURE_USE_INITTAB */
}
+
+
extern int init_main(int argc, char **argv)
{
- initAction *a;
+ initAction *a, *tmp;
pid_t wpid;
int status;
#ifndef DEBUG_INIT
- /* Expect to be PID 1 if we are run as init (not linuxrc) */
- if (getpid() != 1 && strstr(argv[0], "init") != NULL) {
- 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\n");
+ /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
+ if (getpid() != 1
+#ifdef BB_FEATURE_LINUXRC
+ && strstr(applet_name, "linuxrc") == NULL
+#endif
+ )
+ {
+ show_usage();
}
- /* Fix up argv[0] to be certain we claim to be init */
- strncpy(argv[0], "init", strlen(argv[0]));
-
/* Set up sig handlers -- be sure to
* clear all of these in run() */
signal(SIGUSR1, halt_signal);
- signal(SIGUSR2, reboot_signal);
- signal(SIGINT, reboot_signal);
+ signal(SIGUSR2, halt_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... */
- reboot(RB_DISABLE_CAD);
+ 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(1);
close(2);
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(LOG | CONSOLE,
- "init started: BusyBox v%s (%s) multi-call binary\r\n",
- BB_VER, BB_BT);
+ message(
+#if ! defined BB_FEATURE_EXTRA_QUIET
+ CONSOLE|
+#endif
+ LOG,
+ "init started: %s\r\n", full_version);
#else
- message(LOG | CONSOLE,
- "init(%d) started: BusyBox v%s (%s) multi-call binary\r\n",
- getpid(), BB_VER, BB_BT);
+ message(
+#if ! defined BB_FEATURE_EXTRA_QUIET
+ CONSOLE|
+#endif
+ LOG,
+ "init(%d) started: %s\r\n", getpid(), full_version);
#endif
- /* Mount /proc */
- if (mount("proc", "/proc", "proc", 0, 0) == 0) {
- message(LOG | CONSOLE, "Mounting /proc: done.\n");
- kernelVersion = get_kernel_revision();
- } else
- message(LOG | CONSOLE, "Mounting /proc: failed!\n");
-
/* Make sure there is enough memory to do something useful. */
check_memory();
/* Check if we are supposed to be in single user mode */
if (argc > 1 && (!strcmp(argv[1], "single") ||
!strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
- /* Ask first then start a shell on tty2 */
+ /* Ask first then start a shell on tty2-4 */
if (secondConsole != NULL)
new_initAction(ASKFIRST, SHELL, secondConsole);
+ if (thirdConsole != NULL)
+ new_initAction(ASKFIRST, SHELL, thirdConsole);
+ if (fourthConsole != NULL)
+ new_initAction(ASKFIRST, SHELL, fourthConsole);
/* Start a shell on tty1 */
new_initAction(RESPAWN, SHELL, console);
} else {
parse_inittab();
}
+ /* 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 */
sleep(1);
}
}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
projects / oweals / busybox.git / blobdiff