#include "internal.h"
#include <stdio.h>
+#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <termios.h>
+#include <paths.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/wait.h>
#include <linux/serial.h> /* for serial_struct */
#include <sys/vt.h> /* for vt_stat */
#include <sys/ioctl.h>
+#include <linux/version.h>
+#ifdef BB_SYSLOGD
+#include <sys/syslog.h>
+#endif
+
+#if ! defined BB_FEATURE_USE_PROCFS
+#error Sorry, I depend on the /proc filesystem right now.
+#endif
+
+#ifndef KERNEL_VERSION
+#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#endif
-#define DEV_CONSOLE "/dev/console" /* Logical system console */
-#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 INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
-#define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin"
+
+#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. */
+#endif
#define LOG 0x1
#define CONSOLE 0x2
-static char *console = DEV_CONSOLE;
-static char *second_console = VT_SECONDARY;
+
+/* Allowed init action types */
+typedef enum {
+ SYSINIT=1,
+ RESPAWN,
+ ASKFIRST,
+ WAIT,
+ ONCE
+} initActionEnum;
+
+/* And now a list of the actions we support in the version of init */
+typedef struct initActionType{
+ const char* name;
+ initActionEnum action;
+} initActionType;
+
+static const struct initActionType actions[] = {
+ {"sysinit", SYSINIT},
+ {"respawn", RESPAWN},
+ {"askfirst", ASKFIRST},
+ {"wait", WAIT},
+ {"once", ONCE},
+ {0}
+};
+
+/* Set up a linked list of initactions, to be read from inittab */
+typedef struct initActionTag initAction;
+struct initActionTag {
+ pid_t pid;
+ char process[256];
+ char console[256];
+ initAction *nextPtr;
+ initActionEnum action;
+};
+initAction* initActionList = NULL;
+
+
+static char *secondConsole = VT_SECONDARY;
static char *log = VT_LOG;
-static int kernel_version = 0;
+static int kernelVersion = 0;
+static char termType[32] = "TERM=ansi";
+static char console[32] = _PATH_CONSOLE;
/* try to open up the specified device */
* device may be bitwise-or'd from LOG | CONSOLE */
void message(int device, char *fmt, ...)
{
+ va_list arguments;
int fd;
+
+#ifdef BB_SYSLOGD
+
+ /* Log the message to syslogd */
+ if (device & LOG ) {
+ char msg[1024];
+ va_start(arguments, fmt);
+ vsnprintf(msg, sizeof(msg), fmt, arguments);
+ va_end(arguments);
+ openlog( "init", 0, LOG_DAEMON);
+ syslog(LOG_DAEMON|LOG_NOTICE, msg);
+ closelog();
+ }
+
+#else
static int log_fd=-1;
- va_list arguments;
/* Take full control of the log tty, and never close it.
* It's mine, all mine! Muhahahaha! */
return;
}
}
-
if ( (device & LOG) && (log_fd >= 0) ) {
va_start(arguments, fmt);
vdprintf(log_fd, fmt, arguments);
va_end(arguments);
}
+#endif
+
if (device & CONSOLE) {
/* Always send console messages to /dev/console so people will see them. */
- if ((fd = device_open(DEV_CONSOLE, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) {
+ if ((fd = device_open(_PATH_CONSOLE, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) {
va_start(arguments, fmt);
vdprintf(fd, fmt, arguments);
va_end(arguments);
{
struct termios tty;
static const char control_characters[] = {
- '\003', '\034', '\177', '\030', '\004', '\0',
+ '\003', '\034', '\177', '\025', '\004', '\0',
'\1', '\0', '\021', '\023', '\032', '\0', '\022',
'\017', '\027', '\026', '\0'
};
tcgetattr(fd, &tty);
- /* Make it be sane */
- tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
- tty.c_cflag |= HUPCL|CLOCAL;
-
- /* input modes */
- tty.c_iflag = IGNPAR|ICRNL|IXON|IXOFF|IXANY;
+ /* set control chars */
+ memcpy(tty.c_cc, control_characters, sizeof(control_characters));
/* 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;
+
+ /* input modes */
+ tty.c_iflag = ICRNL|IXON|IXOFF;
+
/* output modes */
tty.c_oflag = OPOST|ONLCR;
/* local modes */
- tty.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOPRT|ECHOKE|IEXTEN;
-
- /* control chars */
- memcpy(tty.c_cc, control_characters, sizeof(control_characters));
+ tty.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN;
tcsetattr(fd, TCSANOW, &tty);
}
struct serial_struct sr;
char *s;
+ if ((s = getenv("TERM")) != NULL) {
+ snprintf(termType,sizeof(termType)-1,"TERM=%s",s);
+ }
+
if ((s = getenv("CONSOLE")) != NULL) {
- console = s;
+ snprintf(console, sizeof(console)-1, "%s",s);
}
#if #cpu(sparc)
/* sparc kernel supports console=tty[ab] parameter which is also
else if ((s = getenv("console")) != NULL) {
/* remap tty[ab] to /dev/ttyS[01] */
if (strcmp( s, "ttya" )==0)
- console = SERIAL_CON0;
+ snprintf(console, sizeof(console)-1, "%s", SERIAL_CON0);
else if (strcmp( s, "ttyb" )==0)
- console = SERIAL_CON1;
+ snprintf(console, sizeof(console)-1, "%s", SERIAL_CON1);
}
#endif
else {
struct vt_stat vt;
- static char the_console[13];
- console = the_console;
/* 2.2 kernels: identify the real console backend and try to use it */
- if (ioctl(0,TIOCGSERIAL,&sr) == 0) {
+ if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
/* this is a serial console */
- snprintf( the_console, sizeof the_console, "/dev/ttyS%d", sr.line );
+ snprintf(console, sizeof(console)-1, "/dev/ttyS%d", sr.line);
}
else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
/* this is linux virtual tty */
- snprintf( the_console, sizeof the_console, "/dev/tty%d", vt.v_active );
+ snprintf(console, sizeof(console)-1, "/dev/tty%d", vt.v_active);
} else {
- console = DEV_CONSOLE;
+ snprintf(console, sizeof(console)-1, "%s", _PATH_CONSOLE);
tried_devcons++;
}
}
/* Can't open selected console -- try /dev/console */
if (!tried_devcons) {
tried_devcons++;
- console = DEV_CONSOLE;
+ snprintf(console, sizeof(console)-1, "%s", _PATH_CONSOLE);
continue;
}
/* Can't open selected console -- try vt1 */
if (!tried_vtprimary) {
tried_vtprimary++;
- console = VT_PRIMARY;
+ snprintf(console, sizeof(console)-1, "%s", VT_PRIMARY);
continue;
}
break;
}
- if (fd < 0)
+ if (fd < 0) {
/* Perhaps we should panic here? */
- console = "/dev/null";
- else {
+ snprintf(console, sizeof(console)-1, "/dev/null");
+ } else {
/* 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;
- second_console = NULL;
+ secondConsole = NULL;
}
close(fd);
}
message(LOG, "console=%s\n", console );
}
-static int waitfor(int pid)
-{
- int status, wpid;
-
- message(LOG, "Waiting for process %d.\n", pid);
- while ((wpid = wait(&status)) != pid) {
- if (wpid > 0)
- message(LOG, "pid %d exited, status=0x%x.\n", wpid, status);
- }
- return wpid;
-}
-
-
-static pid_t run(const char * const* command,
+static pid_t run(char* command,
char *terminal, int get_enter)
{
- int fd;
+ int i, fd;
pid_t pid;
- const char * const* cmd = command+1;
+ char* tmpCmd;
+ char* cmd[255];
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
+ char* environment[] = {
+ "HOME=/",
+ "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
+ "SHELL=/bin/sh",
+ termType,
+ "USER=root",
+ 0
+ };
+
if ((pid = fork()) == 0) {
+ pid_t shell_pgid = getpid ();
+
/* Clean up */
close(0);
close(1);
signal(SIGTERM, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
- message(LOG, "Bummer, can't open %s\r\n", terminal);
- exit(-1);
+ message(LOG|CONSOLE, "Bummer, can't open %s\r\n", terminal);
+ exit(1);
}
dup(fd);
dup(fd);
- tcsetpgrp(0, getpgrp());
+ tcsetpgrp (0, getpgrp());
set_term(0);
if (get_enter==TRUE) {
*/
char c;
message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
- *cmd, getpid(), terminal );
- write(1, press_enter, sizeof(press_enter) - 1);
- read(0, &c, 1);
+ command, shell_pgid, terminal );
+ write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
+ read(fileno(stdin), &c, 1);
}
/* Log the process name and args */
- message(LOG, "Starting pid %d, console %s: '", getpid(), terminal);
- while ( *cmd) message(LOG, "%s ", *cmd++);
+ 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;
+ message(LOG, "%s ", tmpCmd);
+ tmpCmd++;
+ i++;
+ }
+ }
+ cmd[i] = NULL;
message(LOG, "'\r\n");
-
+
/* Now run it. The new program will take over this PID,
* so nothing further in init.c should be run. */
- execvp(*command, (char**)command+1);
+ execve(cmd[0], cmd, environment);
- message(LOG, "Bummer, could not run '%s'\n", command);
+ /* We're still here? Some error happened. */
+ message(LOG|CONSOLE, "Bummer, could not run '%s': %s\n", cmd[0],
+ strerror(errno));
exit(-1);
}
return pid;
}
+static int waitfor(char* command,
+ char *terminal, int get_enter)
+{
+ int status, wpid;
+ int pid = run( command, terminal, get_enter);
+
+ while (1) {
+ wpid = wait(&status);
+ if (wpid > 0 ) {
+ message(LOG, "Process '%s' (pid %d) exited.\n",
+ command, wpid);
+ break;
+ }
+ if (wpid == pid )
+ break;
+ }
+ return wpid;
+}
+
/* Make sure there is enough memory to do something useful. *
* Calls swapon if needed so be sure /proc is mounted. */
static void check_memory()
{
- struct stat statbuf;
- const char* const swap_on_cmd[] =
- { "/bin/swapon", "swapon", "-a", 0};
+ struct stat statBuf;
if (mem_total() > 3500)
return;
- if (stat("/etc/fstab", &statbuf) == 0) {
+ if (stat("/etc/fstab", &statBuf) == 0) {
/* Try to turn on swap */
- waitfor(run(swap_on_cmd, log, FALSE));
+ waitfor("/bin/swapon swapon -a", log, FALSE);
if (mem_total() < 3500)
goto goodnight;
} else
while (1) sleep(1);
}
+#ifndef DEBUG_INIT
static void shutdown_system(void)
{
- const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 0};
- const char* const umount_cmd[] = { "umount", "umount", "-a", "-n", 0};
-
-#ifndef DEBUG_INIT
/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
-#endif
- message(CONSOLE, "The system is going down NOW !!\r\n");
+ message(CONSOLE, "\r\nThe system is going down NOW !!\r\n");
sync();
+
/* Send signals to every process _except_ pid 1 */
message(CONSOLE, "Sending SIGHUP to all processes.\r\n");
-#ifndef DEBUG_INIT
kill(-1, SIGHUP);
-#endif
sleep(2);
sync();
+
message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
-#ifndef DEBUG_INIT
kill(-1, SIGKILL);
-#endif
sleep(1);
- waitfor(run( swap_off_cmd, console, FALSE));
- waitfor(run( umount_cmd, console, FALSE));
+
+ message(CONSOLE, "Disabling swap.\r\n");
+ waitfor( "swapoff -a", console, FALSE);
+ message(CONSOLE, "Unmounting filesystems.\r\n");
+ waitfor("umount -a", console, FALSE);
sync();
- if (kernel_version > 0 && kernel_version <= 2 * 65536 + 2 * 256 + 11) {
+ if (kernelVersion > 0 && kernelVersion <= 2 * 65536 + 2 * 256 + 11) {
/* bdflush, kupdate not needed for kernels >2.2.11 */
- message(CONSOLE, "Flushing buffers.\r\n");
bdflush(1, 0);
sync();
}
message(CONSOLE,
"The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
sync();
-#ifndef DEBUG_INIT
- reboot(RB_HALT_SYSTEM);
- //reboot(RB_POWER_OFF);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+ if (sig == SIGUSR2)
+ reboot(RB_POWER_OFF);
+ else
#endif
+ reboot(RB_HALT_SYSTEM);
exit(0);
}
shutdown_system();
message(CONSOLE, "Please stand by while rebooting the system.\r\n");
sync();
-#ifndef DEBUG_INIT
reboot(RB_AUTOBOOT);
-#endif
exit(0);
}
-extern int init_main(int argc, char **argv)
+#if defined BB_FEATURE_INIT_CHROOT
+static void check_chroot(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. Hit ctrl+alt+delete to reboot.\r\n");
+ return;
+}
+#endif /* BB_FEATURE_INIT_CHROOT */
+
+#endif /* ! DEBUG_INIT */
+
+void new_initAction (initActionEnum action,
+ char* process, char* cons)
{
- int run_rc = TRUE;
- int wait_for_enter = TRUE;
- pid_t pid1 = 0;
- pid_t pid2 = 0;
- struct stat statbuf;
- const char* const rc_script_command[] = { INITSCRIPT, INITSCRIPT, 0};
- const char* const shell_command[] = { SHELL, "-" SHELL, 0};
- const char* const* tty0_command = shell_command;
- const char* const* tty1_command = shell_command;
-#ifdef BB_CONSOLE_CMD_IF_RC_SCRIPT_EXITS
- const char* const rc_exit_command[] = BB_CONSOLE_CMD_IF_RC_SCRIPT_EXITS;
+ initAction* newAction;
+
+ /* If BusyBox detects that a serial console is in use,
+ * then entries containing non-empty id fields will _not_ be run.
+ * The exception to this rule is the null device.
+ */
+ if (secondConsole == NULL && (*cons != '\0' || strncmp(cons, "null", 4)))
+ return;
+
+ newAction = calloc ((size_t)(1), sizeof(initAction));
+ if (!newAction) {
+ message(LOG|CONSOLE,"Memory allocation failure\n");
+ while (1) sleep(1);
+ }
+ newAction->nextPtr = initActionList;
+ initActionList = newAction;
+ strncpy( newAction->process, process, 255);
+ newAction->action = action;
+ if (*cons != '\0') {
+ strncpy(newAction->console, cons, 255);
+ } else
+ strncpy(newAction->console, console, 255);
+ newAction->pid = 0;
+// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
+// newAction->process, newAction->action, newAction->console);
+}
+
+void delete_initAction (initAction *action)
+{
+ initAction *a, *b=NULL;
+ for( a=initActionList ; a; b=a, a=a->nextPtr) {
+ if (a == action && b != NULL) {
+ b->nextPtr=a->nextPtr;
+ free( a);
+ break;
+ }
+ }
+}
+
+/* NOTE that if BB_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 BB_FEATURE_USE_INITTAB
+ * _is_ defined, but /etc/inittab is missing, this
+ * results in the same set of default behaviors.
+ * */
+void parse_inittab(void)
+{
+#ifdef BB_FEATURE_USE_INITTAB
+ FILE* file;
+ char buf[256], lineAsRead[256], tmpConsole[256];
+ char *p, *q, *r, *s;
+ const struct initActionType *a = actions;
+ int foundIt;
+
+
+ file = fopen(INITTAB, "r");
+ if (file == NULL) {
+ /* No inittab file -- set up some default behavior */
#endif
+ /* Askfirst shell on tty1 */
+ new_initAction( ASKFIRST, SHELL, console );
+ /* Askfirst shell on tty2 */
+ if (secondConsole != NULL)
+ new_initAction( ASKFIRST, SHELL, secondConsole );
+ /* sysinit */
+ new_initAction( SYSINIT, INIT_SCRIPT, console );
-#ifdef DEBUG_INIT
- char *hello_msg_format =
- "init(%d) started: BusyBox v%s (%s) multi-call binary\r\n";
-#else
- char *hello_msg_format =
- "init started: BusyBox v%s (%s) multi-call binary\r\n";
+ return;
+#ifdef BB_FEATURE_USE_INITTAB
+ }
+
+ while ( fgets(buf, 255, file) != NULL) {
+ foundIt=FALSE;
+ for(p = buf; *p == ' ' || *p == '\t'; p++);
+ if (*p == '#' || *p == '\n') continue;
+
+ /* Trim the trailing \n */
+ q = strrchr( p, '\n');
+ if (q != NULL)
+ *q='\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;
+ }
+
+ /* Now peal off the process field from the end
+ * of the string */
+ q = strrchr( p, ':');
+ if ( q == NULL || *(q+1) == '\0' ) {
+ message(LOG|CONSOLE,"Bad inittab entry: %s\n", lineAsRead);
+ continue;
+ } else {
+ *q='\0';
+ ++q;
+ }
+
+ /* Now peal off the action field */
+ r = strrchr( p, ':');
+ if ( r == NULL || *(r+1) == '\0') {
+ message(LOG|CONSOLE,"Bad inittab entry: %s\n", lineAsRead);
+ continue;
+ } else {
+ ++r;
+ }
+
+ /* Ok, now process it */
+ a = actions;
+ while (a->name != 0) {
+ if (strcmp(a->name, r) == 0) {
+ if (*s != '\0') {
+ struct stat statBuf;
+ 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;
+ }
+ new_initAction( a->action, q, s);
+ foundIt=TRUE;
+ }
+ a++;
+ }
+ if (foundIt==TRUE)
+ continue;
+ else {
+ /* Choke on an unknown action */
+ message(LOG|CONSOLE, "Bad inittab entry: %s\n", lineAsRead);
+ }
+ }
+ return;
#endif
+}
+
+extern int init_main(int argc, char **argv)
+{
+ initAction *a;
+ pid_t wpid;
+ int status;
-
#ifndef DEBUG_INIT
- if (getpid() != 1) {
+ /* 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");
}
-#endif
-
- /* 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"))) {
- run_rc = FALSE;
- }
+ /* 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(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... */
-#ifndef DEBUG_INIT
reboot(RB_DISABLE_CAD);
#endif
setsid();
/* Make sure PATH is set to something sane */
- putenv(PATH_DEFAULT);
+ putenv(_PATH_STDPATH);
-
/* Hello world */
#ifndef DEBUG_INIT
- message(CONSOLE|LOG, hello_msg_format, BB_VER, BB_BT);
+ message(LOG|CONSOLE,
+ "init started: BusyBox v%s (%s) multi-call binary\r\n",
+ BB_VER, BB_BT);
#else
- message(CONSOLE|LOG, hello_msg_format, getpid(), BB_VER, BB_BT);
+ message(LOG|CONSOLE,
+ "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(CONSOLE|LOG, "Mounting /proc: done.\n");
- kernel_version = get_kernel_revision();
+ message(LOG|CONSOLE, "Mounting /proc: done.\n");
+ kernelVersion = get_kernel_revision();
} else
- message(CONSOLE|LOG, "Mounting /proc: failed!\n");
+ message(LOG|CONSOLE, "Mounting /proc: failed!\n");
/* Make sure there is enough memory to do something useful. */
check_memory();
-
- /* Make sure an init script exists before trying to run it */
- if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)==0) {
- wait_for_enter = FALSE;
- tty0_command = rc_script_command;
+ /* 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 */
+ if (secondConsole != NULL)
+ new_initAction( ASKFIRST, SHELL, secondConsole);
+ /* Ask first then start a shell on tty1 */
+ new_initAction( ASKFIRST, SHELL, console);
+ } else {
+ /* Not in single user mode -- see what inittab says */
+
+ /* NOTE that if BB_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 */
+ parse_inittab();
}
+ /* Now run everything that needs to be run */
- /* Ok, now launch the rc script and/or prepare to
- * start up some VTs if somebody hits enter...
- */
- for (;;) {
- pid_t wpid;
- int status;
-
- if (pid1 == 0 && tty0_command) {
- pid1 = run(tty0_command, console, wait_for_enter);
+ /* First run the sysinit command */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->action == SYSINIT) {
+ waitfor(a->process, a->console, FALSE);
+ /* Now remove the "sysinit" entry from the list */
+ delete_initAction( a);
}
- if (pid2 == 0 && tty1_command && second_console) {
- pid2 = run(tty1_command, second_console, TRUE);
+ }
+ /* Next run anything that wants to block */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->action == WAIT) {
+ waitfor(a->process, a->console, FALSE);
+ /* Now remove the "wait" entry from the list */
+ delete_initAction( a);
}
- wpid = wait(&status);
- if (wpid > 0 ) {
- message(LOG, "pid %d exited, status=%x.\n", wpid, status);
+ }
+ /* Next run anything to be run only once */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->action == ONCE) {
+ run(a->process, a->console, FALSE);
+ /* Now remove the "once" entry from the list */
+ delete_initAction( a);
}
- /* Don't respawn init script if it exits */
- if (wpid == pid1) {
- if (run_rc == FALSE) {
- pid1 = 0;
- }
-#ifdef BB_CONSOLE_CMD_IF_RC_SCRIPT_EXITS
- else {
- pid1 = 0;
- run_rc=FALSE;
- wait_for_enter=TRUE;
- tty0_command=rc_exit_command;
+ }
+ /* If there is nothing else to do, stop */
+ if (initActionList == NULL) {
+ message(LOG|CONSOLE, "No more tasks for init -- sleeping forever.\n");
+ while (1) sleep(1);
+ }
+
+ /* Now run the looping stuff for the rest of forever */
+ while (1) {
+ for( a=initActionList ; a; a=a->nextPtr) {
+ /* Only run stuff with pid==0. If they have
+ * a pid, that means they are still running */
+ if (a->pid == 0) {
+ switch(a->action) {
+ case RESPAWN:
+ /* run the respawn stuff */
+ a->pid = run(a->process, a->console, FALSE);
+ break;
+ case ASKFIRST:
+ /* run the askfirst stuff */
+ a->pid = run(a->process, a->console, TRUE);
+ break;
+ /* silence the compiler's incessant whining */
+ default:
+ break;
+ }
}
-#endif
}
- if (wpid == pid2) {
- pid2 = 0;
+ /* Wait for a child process to exit */
+ wpid = wait(&status);
+ if (wpid > 0 ) {
+ /* Find out who died and clean up their corpse */
+ for( a=initActionList ; a; a=a->nextPtr) {
+ if (a->pid==wpid) {
+ a->pid=0;
+ message(LOG, "Process '%s' (pid %d) exited. Scheduling it for restart.\n",
+ a->process, wpid);
+ }
+ }
}
sleep(1);
}
}
+
projects / oweals / busybox.git / blobdiff