+/* vi: set sw=4 ts=4: */
/*
* Mini init implementation for busybox
*
*
*/
+/* Turn this on to disable all the dangerous
+ rebooting stuff when debugging.
+#define DEBUG_INIT
+*/
+
#include "internal.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
+#include <asm/types.h>
#include <errno.h>
+#include <linux/serial.h> /* for serial_struct */
+#include <linux/version.h>
+#include <paths.h>
#include <signal.h>
-#include <termios.h>
-#include <sys/types.h>
-#include <sys/fcntl.h>
-#include <sys/wait.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/sysinfo.h> /* For check_free_memory() */
+#ifdef BB_SYSLOGD
+# include <sys/syslog.h>
+#endif
#include <sys/sysmacros.h>
-#include <linux/serial.h> /* for serial_struct */
-#include <sys/vt.h> /* for vt_stat */
-#include <sys/ioctl.h>
-
-#define DEBUG_INIT
+#include <sys/types.h>
+#include <sys/vt.h> /* for vt_stat */
+#include <sys/wait.h>
+#include <termios.h>
+#include <unistd.h>
-#define CONSOLE "/dev/console" /* Logical system console */
-#define VT_PRIMARY "/dev/tty0" /* Virtual console master */
-#define VT_SECONDARY "/dev/tty1" /* Virtual console master */
-#define VT_LOG "/dev/tty2" /* Virtual console master */
-#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"
-static int maxproclen=0;
-static char* argv0;
+#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
-static char* console = CONSOLE;
-static char* second_terminal = "/dev/tty2";
-static char* log = "/dev/tty3";
+#ifndef KERNEL_VERSION
+#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#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 */
+#ifndef INIT_SCRIPT
+#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
+#endif
-/* try to open up the specified device */
-int device_open(char* device, int mode)
+#define LOG 0x1
+#define CONSOLE 0x2
+
+/* Allowed init action types */
+typedef enum {
+ SYSINIT = 1,
+ RESPAWN,
+ ASKFIRST,
+ WAIT,
+ ONCE,
+ CTRLALTDEL
+} initActionEnum;
+
+/* A mapping between "inittab" action name strings and action type codes. */
+typedef struct initActionType {
+ const char *name;
+ initActionEnum action;
+} initActionType;
+
+static const struct initActionType actions[] = {
+ {"sysinit", SYSINIT},
+ {"respawn", RESPAWN},
+ {"askfirst", ASKFIRST},
+ {"wait", WAIT},
+ {"once", ONCE},
+ {"ctrlaltdel", CTRLALTDEL},
+ {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 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 */
+static void message(int device, char *fmt, ...)
{
- int m, f, fd = -1;
-
- mode = m | O_NONBLOCK;
-
- /* Retry up to 5 times */
- for(f = 0; f < 5; f++)
- if ((fd = open(device, m)) >= 0) break;
- if (fd < 0) return fd;
- /* Set original flags. */
- if (m != mode)
- fcntl(fd, F_SETFL, mode);
- return fd;
-}
+ va_list arguments;
+ int fd;
-/* print a message to the specified device */
-void message(char* device, char *fmt, ...)
-{
- int fd;
- va_list arguments;
- if ((fd = device_open(device, O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) {
- va_start(arguments, fmt);
- vdprintf(fd, fmt, arguments);
- va_end(arguments);
- }
- close( 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_USER);
+ syslog(LOG_USER|LOG_INFO, msg);
+ closelog();
+ }
+#else
+ static int log_fd = -1;
+
+ /* Take full control of the log tty, and never close it.
+ * It's mine, all mine! Muhahahaha! */
+ if (log_fd < 0) {
+ if (log == NULL) {
+ /* don't even try to log, because there is no such console */
+ log_fd = -2;
+ /* log to main console instead */
+ device = CONSOLE;
+ } 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);
+ log = NULL;
+ device = CONSOLE;
+ }
+ }
+ 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(_PATH_CONSOLE,
+ O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
+ va_start(arguments, fmt);
+ vdprintf(fd, fmt, arguments);
+ va_end(arguments);
+ close(fd);
+ } else {
+ 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()
+void set_term(int fd)
{
- int fd;
- struct termios tty;
+ struct termios tty;
- if ((fd = device_open(console, O_RDWR|O_NOCTTY)) < 0) {
- message(log, "can't open %s", console);
- return;
- }
- ioctl(fd, TCGETS, &tty);
- tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
- tty.c_cflag |= HUPCL|CLOCAL;
-
- tty.c_cc[VINTR] = 3;
- tty.c_cc[VQUIT] = 28;
- tty.c_cc[VERASE] = 127;
- tty.c_cc[VKILL] = 24;
- tty.c_cc[VEOF] = 4;
- tty.c_cc[VTIME] = 0;
- tty.c_cc[VMIN] = 1;
- tty.c_cc[VSTART] = 17;
- tty.c_cc[VSTOP] = 19;
- tty.c_cc[VSUSP] = 26;
-
- /* Set pre and post processing */
- tty.c_iflag = IGNPAR|ICRNL|IXON|IXANY;
- tty.c_oflag = OPOST|ONLCR;
- tty.c_lflag = ISIG|ICANON|ECHO|ECHOCTL|ECHOPRT|ECHOKE;
-
- /* Now set the terminal line. */
- ioctl(fd, TCSETS, &tty);
- close( fd);
+ tcgetattr(fd, &tty);
+
+ /* set control chars */
+ 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;
+
+ /* 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 | ECHOKE | IEXTEN;
+
+ tcsetattr(fd, TCSANOW, &tty);
}
-static int
-mem_total()
+/* How much memory does this machine have? */
+static int check_free_memory()
{
- char s[80];
- char *p;
- FILE *f;
- const char pattern[]="MemTotal:";
-
- f=fopen("/proc/meminfo","r");
- while (NULL != fgets(s,79,f)) {
- p=strstr(s, pattern);
- if (NULL != p) {
- fclose(f);
- return(atoi(p+strlen(pattern)));
+ struct sysinfo info;
+
+ sysinfo(&info);
+ if (sysinfo(&info) != 0) {
+ message(LOG, "Error checking free memory: %s\n", strerror(errno));
+ return -1;
}
- }
- return -1;
+
+ return((info.totalram+info.totalswap)/1024);
}
-static void
-set_free_pages()
+static void console_init()
{
- char s[80];
- FILE *f;
-
- f=fopen("/proc/sys/vm/freepages","r");
- fgets(s,79,f);
- if (atoi(s) < 32) {
- fclose(f);
- f=fopen("/proc/sys/vm/freepages","w");
- fprintf(f,"30\t40\t50\n");
- printf("\nIncreased /proc/sys/vm/freepages values to 30/40/50\n");
- }
- fclose(f);
-}
+ int fd;
+ int tried_devcons = 0;
+ int tried_vtprimary = 0;
+ struct vt_stat vt;
+ struct serial_struct sr;
+ char *s;
+
+ if ((s = getenv("TERM")) != NULL) {
+ snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
+ }
+ if ((s = getenv("CONSOLE")) != NULL) {
+ snprintf(console, sizeof(console) - 1, "%s", s);
+ }
+#if #cpu(sparc)
+ /* sparc kernel supports console=tty[ab] parameter which is also
+ * passed to init, so catch it here */
+ else if ((s = getenv("console")) != NULL) {
+ /* remap tty[ab] to /dev/ttyS[01] */
+ if (strcmp(s, "ttya") == 0)
+ snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON0);
+ else if (strcmp(s, "ttyb") == 0)
+ snprintf(console, sizeof(console) - 1, "%s", SERIAL_CON1);
+ }
+#endif
+ else {
+ /* 2.2 kernels: identify the real console backend and try to use it */
+ if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
+ /* this is a serial console */
+ snprintf(console, sizeof(console) - 1, "/dev/ttyS%d", sr.line);
+ } else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
+ /* this is linux virtual tty */
+ snprintf(console, sizeof(console) - 1, "/dev/tty%d",
+ vt.v_active);
+ } else {
+ snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
+ tried_devcons++;
+ }
+ }
-static void
-console_init()
-{
- int fd;
- int tried_devcons = 0;
- int tried_vtmaster = 0;
- char *s;
-
- if ((s = getenv("CONSOLE")) != NULL)
- console = s;
- else {
- console = CONSOLE;
- tried_devcons++;
- }
- while ((fd = open(console, O_RDONLY|O_NONBLOCK)) < 0) {
- if (!tried_devcons) {
- tried_devcons++;
- console = CONSOLE;
- continue;
+ while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
+ /* Can't open selected console -- try /dev/console */
+ if (!tried_devcons) {
+ tried_devcons++;
+ snprintf(console, sizeof(console) - 1, "%s", _PATH_CONSOLE);
+ continue;
+ }
+ /* Can't open selected console -- try vt1 */
+ if (!tried_vtprimary) {
+ tried_vtprimary++;
+ snprintf(console, sizeof(console) - 1, "%s", VT_PRIMARY);
+ continue;
+ }
+ break;
}
- if (!tried_vtmaster) {
- tried_vtmaster++;
- console = VT_PRIMARY;
- continue;
+ if (fd < 0) {
+ /* 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 */
+ if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
+ 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);
}
- break;
- }
- if (fd < 0)
- console = "/dev/null";
- else
- close(fd);
+ message(LOG, "console=%s\n", console);
}
-static int
-waitfor(int pid)
+static pid_t run(char *command, char *terminal, int get_enter)
{
- 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=%x.\n", wpid, status);
- }
- return wpid;
+ int i, fd;
+ pid_t pid;
+ char *tmpCmd;
+ char *cmd[255];
+ char buf[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) {
+ /* Clean up */
+ close(0);
+ close(1);
+ close(2);
+ setsid();
+
+ /* Reset signal handlers set for parent process */
+ signal(SIGUSR1, SIG_DFL);
+ signal(SIGUSR2, SIG_DFL);
+ signal(SIGINT, SIG_DFL);
+ signal(SIGTERM, SIG_DFL);
+ signal(SIGHUP, SIG_DFL);
+
+ if ((fd = device_open(terminal, O_RDWR)) < 0) {
+ message(LOG | CONSOLE, "Bummer, can't open %s\r\n", terminal);
+ exit(1);
+ }
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ 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.
+ */
+ 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: '%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;
+ 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;
+ }
+
+#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. */
+ execve(cmd[0], cmd, environment);
+
+ /* 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
-run(const char* command, char* terminal, int get_enter)
+static int waitfor(char *command, char *terminal, int get_enter)
{
- int f, pid;
- char *args[16];
- char buf[256];
- char* ptr;
- static const char press_enter[] =
- "\nPlease press Enter to activate this console. ";
-
-
- /* Make a proper command from the command string */
- strcpy(buf, command);
- ptr = buf;
- for(f = 1; f < 15; f++) {
- /* Skip white space */
- while(*ptr == ' ' || *ptr == '\t') ptr++;
- args[f] = ptr;
- /* May be trailing space.. */
- if (*ptr == 0) break;
- /* Skip this `word' */
- while(*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#')
- ptr++;
- /* If end-of-line, break */
- if (*ptr == '#' || *ptr == 0) {
- f++;
- *ptr = 0;
- break;
- }
- /* End word with \0 and continue */
- args[f] = NULL;
- }
- args[0] = args[1];
-
-
- if ((pid = fork()) == 0) {
- /* Clean up */
- close(0);
- close(1);
- close(2);
- setsid();
+ int status, wpid;
+ int pid = run(command, terminal, get_enter);
- if ((f = device_open(terminal, O_RDWR|O_NOCTTY)) < 0) {
- message( log, "open(%s) failed: %s", terminal, strerror(errno));
- return -1;
- }
- dup(f);
- dup(f);
- tcsetpgrp(0, getpgrp());
- set_term();
-
- if ( get_enter ) {
- /*
- * 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.
- */
- char c;
- write(1, press_enter, sizeof(press_enter) - 1);
- read(0, &c, 1);
+ while (1) {
+ wpid = wait(&status);
+ if (wpid > 0 && wpid != pid) {
+ continue;
+ }
+ if (wpid == pid)
+ break;
}
+ return wpid;
+}
+
+/* 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()
+{
+ struct stat statBuf;
+
+ if (check_free_memory() > 1000)
+ return;
+
+ if (stat("/etc/fstab", &statBuf) == 0) {
+ /* Try to turn on swap */
+ system("/sbin/swapon -a");
+ if (check_free_memory() < 1000)
+ goto goodnight;
+ } else
+ goto goodnight;
+ return;
- /* Log the process name and args */
- message(log, "Executing '%s'\n", command);
-
- /* Now run it. This should take over the PID, so nothing
- * further in init.c should be run by this PID. */
- execvp(args[1], args + 1);
-
- /* If shell scripts are not executed, force the issue */
- if (errno == ENOEXEC) {
- char buf[256];
- args[1] = SHELL;
- args[2] = "-c";
- strcpy(buf, "exec ");
- strcat(buf, command);
- args[3] = buf;
- args[4] = NULL;
- execvp(args[1], args + 1);
+ goodnight:
+ message(CONSOLE,
+ "Sorry, your computer does not have enough memory.\r\n");
+ while (1)
+ 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);
+ }
}
- message(log, "Could not execute '%s'\n", command, strerror(errno));
- exit(-1);
- }
- return pid;
}
+
#ifndef DEBUG_INIT
-static void
-shutdown_system(void)
+static void shutdown_system(void)
{
- message(console, "The system is going down NOW !!");
- sync();
- /* Allow Ctrl-Alt-Del to reboot system. */
- reboot(RB_ENABLE_CAD);
-
- /* Send signals to every process _except_ pid 1 */
- message(console, "Sending SIGHUP to all processes.\r\n");
- kill(-1, SIGHUP);
- sleep(2);
- sync();
- message(console, "Sending SIGKILL to all processes.\r\n");
- kill(-1, SIGKILL);
- sleep(1);
- waitfor(run("/bin/swapoff -a", console, 0));
- waitfor(run("/bin/umount -a -n", console, 0));
- sync();
- if (get_kernel_revision() <= 2*65536+2*256+11) {
- /* Removed bdflush call, kupdate in kernels >2.2.11 */
- bdflush(1, 0);
+ /* first disable our SIGHUP signal */
+ signal(SIGHUP, SIG_DFL);
+
+ /* Allow Ctrl-Alt-Del to reboot system. */
+ 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|LOG, "Sending SIGTERM to all processes.\r\n");
+ kill(-1, SIGTERM);
+ sleep(1);
+ sync();
+
+ message(CONSOLE|LOG, "Sending SIGKILL to all processes.\r\n");
+ kill(-1, SIGKILL);
+ sleep(1);
+
+ /* run everything to be run at "ctrlaltdel" */
+ run_lastAction();
+
sync();
- }
+ if (kernelVersion > 0 && kernelVersion <= 2 * 65536 + 2 * 256 + 11) {
+ /* bdflush, kupdate not needed for kernels >2.2.11 */
+ bdflush(1, 0);
+ sync();
+ }
}
-static void
-halt_signal(int sig)
+static void halt_signal(int sig)
{
- shutdown_system();
- message(console, "The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
- reboot( RB_POWER_OFF);
- exit(0);
+ shutdown_system();
+ 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(2);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+ if (sig == SIGUSR2)
+ reboot(RB_POWER_OFF);
+ else
+#endif
+ reboot(RB_HALT_SYSTEM);
+ exit(0);
}
-static void
-reboot_signal(int sig)
+static void reboot_signal(int sig)
{
- shutdown_system();
- message(console, "Please stand by while rebooting the system.\r\n");
- reboot( RB_AUTOBOOT);
- exit(0);
+ shutdown_system();
+ 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);
+ exit(0);
}
+
+#if defined BB_FEATURE_INIT_CHROOT
+
+#if ! defined BB_FEATURE_USE_PROCFS
+#error Sorry, I depend on the /proc filesystem right now.
#endif
-int setproctitle(char *fmt, ...)
+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. Press %s to reboot.\r\n",
+ (secondConsole == NULL) /* serial console */
+ ? "Reset" : "CTRL-ALT-DEL");
+ return;
+}
+#endif /* BB_FEATURE_INIT_CHROOT */
+
+#endif /* ! DEBUG_INIT */
+
+void new_initAction(initActionEnum action, char *process, char *cons)
+{
+ initAction *newAction;
+
+ if (*cons == '\0')
+ cons = console;
+
+ /* If BusyBox detects that a serial console is in use,
+ * then entries not refering to the console or null devices will _not_ be run.
+ * The exception to this rule is the null device.
+ */
+ if (secondConsole == NULL && strcmp(cons, console)
+ && strcmp(cons, "/dev/null"))
+ 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;
+ strncpy(newAction->console, cons, 255);
+ newAction->pid = 0;
+// message(LOG|CONSOLE, "process='%s' action='%d' console='%s'\n",
+// newAction->process, newAction->action, newAction->console);
+}
+
+static void delete_initAction(initAction * action)
{
- va_list ap;
- int len;
- char buf[256];
-
- buf[0] = 0;
- va_start(ap, fmt);
- len = vsprintf(buf, fmt, ap);
- va_end(ap);
- memset(argv0, 0, maxproclen + 1);
- strncpy(argv0, buf, maxproclen);
- return len;
+ initAction *a, *b = NULL;
+
+ for (a = initActionList; a; b = a, a = a->nextPtr) {
+ if (a == action) {
+ if (b == NULL) {
+ initActionList = a->nextPtr;
+ } else {
+ b->nextPtr = a->nextPtr;
+ }
+ free(a);
+ break;
+ }
+ }
}
-extern int
-init_main(int argc, char * * argv)
+/* 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)
{
- int run_rc = TRUE;
- int pid1 = 0;
- int pid2 = 0;
- struct stat statbuf;
- const char* init_commands = SHELL "-c exec " INITSCRIPT;
- const char* shell_commands = SHELL;
- const char* tty0_commands = init_commands;
- const char* tty1_commands = shell_commands;
- const char* no_memory =
- "Sorry, your computer does not have enough memory.\n";
-
- /* For later use */
- argv0 = argv[0];
- maxproclen = strlen(argv[0]);
- setproctitle("init [boot]");
+#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
+ /* 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 */
+ if (secondConsole != NULL)
+ new_initAction(ASKFIRST, SHELL, secondConsole);
+ /* sysinit */
+ new_initAction(SYSINIT, INIT_SCRIPT, console);
+
+ 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 peel 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 peel 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 /* BB_FEATURE_USE_INITTAB */
+}
+
+
+extern int init_main(int argc, char **argv)
+{
+ initAction *a;
+ pid_t wpid;
+ int status;
#ifndef DEBUG_INIT
- /* Set up sig handlers */
+ /* 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");
+ }
+ /* Set up sig handlers -- be sure to
+ * clear all of these in run() */
signal(SIGUSR1, halt_signal);
- signal(SIGSEGV, halt_signal);
- signal(SIGPWR, halt_signal);
- signal(SIGALRM, halt_signal);
- signal(SIGHUP, halt_signal);
signal(SIGUSR2, reboot_signal);
- signal(SIGINT, reboot_signal);
+ signal(SIGINT, reboot_signal);
signal(SIGTERM, reboot_signal);
+#if defined BB_FEATURE_INIT_CHROOT
+ signal(SIGHUP, check_chroot);
#endif
- /* Figure out where the default console should be */
- console_init();
/* 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
+ /* Figure out what kernel this is running */
+ kernelVersion = get_kernel_revision();
+
+ /* Figure out where the default console should be */
+ console_init();
+
/* Close whatever files are open, and reset the console. */
close(0);
close(1);
close(2);
- set_term();
+ set_term(0);
+ chdir("/");
setsid();
/* Make sure PATH is set to something sane */
- if (getenv("PATH") == NULL)
- putenv(PATH_DEFAULT);
+ putenv(_PATH_STDPATH);
/* Hello world */
- message(console, "%s started: BusyBox v%s (%s) multi-call binary",
- argv[0], BB_VER, BB_BT);
- message(log, "%s started: BusyBox v%s (%s) multi-call binary",
- argv[0], BB_VER, BB_BT);
+#ifndef DEBUG_INIT
+ 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(
+#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 */
- message(console, "Mounting /proc: \n");
- if (mount("/proc","/proc","proc",0,0)) {
- message(log, "%s: could not mount /proc!\n", argv[0]);
- message(console, "failed!\n");
- }
- message(console, "done.\n");
-
-
- /* Make sure there is enough memory to do something useful*/
- set_free_pages();
- if (mem_total() < 2000) {
- int retval;
- retval= stat("/etc/fstab",&statbuf);
- if (retval) {
- message(console, "%s", no_memory);
- while (1) { sleep(1);}
- } else {
- /* Try to turn on swap */
- waitfor(run("/bin/swapon -a", console, 0));
- if (mem_total() < 2000) {
- message(console, "%s", no_memory);
- while (1) { sleep(1);}
- }
- }
- }
+ /* Make sure there is enough memory to do something useful. */
+ check_memory();
/* Check if we are supposed to be in single user mode */
- if (!strcmp(argv[1], "single") || !strcmp(argv[1], "-s") || !strcmp(argv[1], "1")) {
- run_rc = FALSE;
- tty0_commands = shell_commands;
- tty1_commands = 0;
- setproctitle("init [S]");
- } else {
- setproctitle("init [1]");
+ 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);
+ /* Start a shell on tty1 */
+ new_initAction(RESPAWN, 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();
}
- /* Make sure an init script exists before trying to run it */
- if ( run_rc == TRUE && stat( INITSCRIPT, &statbuf)) {
- tty0_commands = shell_commands;
- tty1_commands = shell_commands;
- }
+ /* 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);
- /* Ok, now launch the rc script and/or prepare to
- * start up some VTs if somebody hits enter...
- */
- for ( ; ; ) {
- int wpid;
- int status;
+ /* Now run everything that needs to be run */
- if ( pid1 == 0 && *tty0_commands ) {
- pid1 = run(tty0_commands, console, 1);
+ /* 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_commands ) {
- pid2 = run(tty1_commands, second_terminal, 1);
+ }
+ /* 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 && wpid != pid1) {
- 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);
}
- if ( wpid == pid2 ) {
- pid2 = 0;
+ }
+ /* 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;
+ }
+ }
+ }
+ /* 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);
}
}
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
projects / oweals / busybox.git / blobdiff