*
*/
+/* Turn this on to disable all the dangerous
+ rebooting stuff when debugging.
+#define DEBUG_INIT
+*/
+
#include "internal.h"
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
+#include <asm/types.h>
#include <errno.h>
-#include <signal.h>
-#include <termios.h>
+#include <linux/serial.h> /* for serial_struct */
+#include <linux/version.h>
#include <paths.h>
-#include <sys/types.h>
-#include <sys/fcntl.h>
-#include <sys/wait.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
+#include <sys/fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/kdaemon.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/sysinfo.h> /* For check_free_memory() */
#ifdef BB_SYSLOGD
-#include <sys/syslog.h>
+# include <sys/syslog.h>
#endif
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+#include <sys/vt.h> /* for vt_stat */
+#include <sys/wait.h>
+#include <termios.h>
+#include <unistd.h>
-#if ! defined BB_FEATURE_USE_PROCFS
-#error Sorry, I depend on the /proc filesystem right now.
+
+#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
#ifndef KERNEL_VERSION
#endif
-#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 */
+#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 */
#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 LOG 0x1
+#define CONSOLE 0x2
/* Allowed init action types */
typedef enum {
RESPAWN,
ASKFIRST,
WAIT,
- ONCE
+ ONCE,
+ CTRLALTDEL
} 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},
+ {"ctrlaltdel", CTRLALTDEL},
{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;
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 *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, ...)
{
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("init", 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)) {
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;
}
/* How much memory does this machine have? */
-static int mem_total()
+static int check_free_memory()
{
- char s[80];
- char *p = "/proc/meminfo";
- FILE *f;
- const char pattern[] = "MemTotal:";
+ struct sysinfo info;
- if ((f = fopen(p, "r")) < 0) {
- message(LOG, "Error opening %s: %s\n", p, strerror(errno));
+ sysinfo(&info);
+ if (sysinfo(&info) != 0) {
+ message(LOG, "Error checking free memory: %s\n", strerror(errno));
return -1;
}
- while (NULL != fgets(s, 79, f)) {
- p = strstr(s, pattern);
- if (NULL != p) {
- fclose(f);
- return (atoi(p + strlen(pattern)));
- }
- }
- return -1;
+
+ return((info.totalram+info.totalswap)/1024);
}
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 */
/* check for serial console and disable logging to tty3 & running a
* shell to tty2 */
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
- message(LOG | CONSOLE,
- "serial console detected. Disabling virtual terminals.\r\n");
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");
+ message(LOG | CONSOLE,
+ "serial console detected. Disabling virtual terminals.\r\n");
}
close(fd);
}
pid_t pid;
char *tmpCmd;
char *cmd[255];
+ char buf[255];
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
if ((pid = fork()) == 0) {
- pid_t shell_pgid = getpid();
-
/* Clean up */
close(0);
close(1);
* specifies.
*/
char c;
-
+#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);
read(fileno(stdin), &c, 1);
}
+#ifdef DEBUG_INIT
/* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '",
+ message(LOG, "Starting pid %d, console %s: '%s'\r\n",
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);
#endif
- tmpCmd++;
- i++;
+
+ /* 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;
}
- cmd[i] = NULL;
- message(LOG, "'\r\n");
+
+#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);
+ }
+ }
+#endif
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
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) {
/* Try to turn on swap */
- waitfor("/bin/swapon swapon -a", log, FALSE);
- if (mem_total() < 3500)
+ system("/sbin/swapon -a");
+ 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_lastAction(void)
+{
+ initAction *a;
+ for (a = initActionList; a; a = a->nextPtr) {
+ if (a->action == CTRLALTDEL) {
+ 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");
+
+ 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_lastAction();
- 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) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
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)
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 */
}
#if defined BB_FEATURE_INIT_CHROOT
+
+#if ! defined BB_FEATURE_USE_PROCFS
+#error Sorry, I depend on the /proc filesystem right now.
+#endif
+
static void check_chroot(int sig)
{
char *argv_init[2] = { "init", NULL, };
// newAction->process, newAction->action, newAction->console);
}
-void delete_initAction(initAction * action)
+static void delete_initAction(initAction * action)
{
initAction *a, *b = NULL;
if (file == NULL) {
/* No inittab file -- set up some default behavior */
#endif
+ /* Swapoff on halt/reboot */
+ new_initAction(CTRLALTDEL, "/sbin/swapoff -a > /dev/null 2>&1", console);
+ /* Umount all filesystems on halt/reboot */
+ new_initAction(CTRLALTDEL, "/bin/umount -a -r > /dev/null 2>&1", console);
/* Askfirst shell on tty1 */
new_initAction(ASKFIRST, SHELL, console);
/* Askfirst shell on tty2 */
++p;
}
- /* Now peal off the process field from the end
+ /* Now peel off the process field from the end
* of the string */
q = strrchr(p, ':');
if (q == NULL || *(q + 1) == '\0') {
++q;
}
- /* Now peal off the action field */
+ /* Now peel off the action field */
r = strrchr(p, ':');
if (r == NULL || *(r + 1) == '\0') {
message(LOG | CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
}
}
return;
-#endif
+#endif /* BB_FEATURE_USE_INITTAB */
}
+
+
extern int init_main(int argc, char **argv)
{
initAction *a;
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(argv[0], "linuxrc") == NULL
+#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.\n");
}
- /* 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);
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 */
/* Hello world */
#ifndef DEBUG_INIT
- message(LOG | CONSOLE,
+ message(
+#if ! defined BB_FEATURE_EXTRA_QUIET
+ CONSOLE|
+#endif
+ LOG,
"init started: BusyBox v%s (%s) multi-call binary\r\n",
BB_VER, BB_BT);
#else
- message(LOG | CONSOLE,
+ message(
+#if ! defined BB_FEATURE_EXTRA_QUIET
+ CONSOLE|
+#endif
+ LOG,
"init(%d) started: BusyBox v%s (%s) multi-call binary\r\n",
getpid(), BB_VER, BB_BT);
#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();
parse_inittab();
}
+ /* Fix up argv[0] to be certain we claim to be init */
+ strncpy(argv[0], "init", strlen(argv[0])+1);
+ if (argc > 1)
+ strncpy(argv[1], "\0", strlen(argv[1])+1);
+
/* Now run everything that needs to be run */
/* First run the sysinit command */
sleep(1);
}
}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
projects / oweals / busybox.git / blobdiff