busybox/init.c

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/*
* Mini init implementation for busybox
*
*
* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
* Adjusted by so many folks, it's impossible to keep track.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
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#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <termios.h>
#include <sys/types.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>
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#include <linux/serial.h> /* for serial_struct */
#include <sys/vt.h> /* for vt_stat */
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#include <sys/ioctl.h>
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#define VT_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 */
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#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
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#define SHELL "/bin/sh" /* Default shell */
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#define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
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#define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin"
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#define LOG 0x1
#define CONSOLE 0x2
static char *console = VT_CONSOLE;
static char *second_console = VT_SECONDARY;
static char *log = VT_LOG;
static int kernel_version = 0;
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/* try to open up the specified device */
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int device_open(char *device, int mode)
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{
int m, f, fd = -1;
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m = mode | O_NONBLOCK;
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/* Retry up to 5 times */
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for (f = 0; f < 5; f++)
if ((fd = open(device, m)) >= 0)
break;
if (fd < 0)
return fd;
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/* Reset original flags. */
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if (m != mode)
fcntl(fd, F_SETFL, mode);
return fd;
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}
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/* print a message to the specified device:
* device may be bitwise-or'd from LOG | CONSOLE */
void message(int device, char *fmt, ...)
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{
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int fd;
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static int log_fd=-1;
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va_list arguments;
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/* Take full control of the log tty, and never close it.
* It's mine, all mine! Muhahahaha! */
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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) {
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log_fd=-1;
fprintf(stderr, "Bummer, can't write to log on %s!\r\n", log);
fflush(stderr);
return;
}
}
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if ( (device & LOG) && (log_fd >= 0) ) {
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va_start(arguments, fmt);
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vdprintf(log_fd, fmt, arguments);
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va_end(arguments);
}
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if (device & CONSOLE) {
if ((fd = device_open(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);
}
}
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}
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/* Set terminal settings to reasonable defaults */
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void set_term( int fd)
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{
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struct termios tty;
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static const char control_characters[] = {
'\003', '\034', '\177', '\030', '\004', '\0',
'\1', '\0', '\021', '\023', '\032', '\0', '\022',
'\017', '\027', '\026', '\0'
};
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tcgetattr(fd, &tty);
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/* Make it be sane */
tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
tty.c_cflag |= HUPCL|CLOCAL;
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/* input modes */
tty.c_iflag = IGNPAR|ICRNL|IXON|IXOFF|IXANY;
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/* use line dicipline 0 */
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tty.c_line = 0;
/* output modes */
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tty.c_oflag = OPOST|ONLCR;
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/* 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));
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tcsetattr(fd, TCSANOW, &tty);
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}
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/* How much memory does this machine have? */
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static int mem_total()
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{
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char s[80];
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char *p = "/proc/meminfo";
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FILE *f;
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const char pattern[] = "MemTotal:";
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if ((f = fopen(p, "r")) < 0) {
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message(LOG, "Error opening %s: %s\n", p, strerror( errno));
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return -1;
}
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while (NULL != fgets(s, 79, f)) {
p = strstr(s, pattern);
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if (NULL != p) {
fclose(f);
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return (atoi(p + strlen(pattern)));
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}
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}
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return -1;
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}
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static void console_init()
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{
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int fd;
int tried_devcons = 0;
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int tried_vtprimary = 0;
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struct serial_struct sr;
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char *s;
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if ((s = getenv("CONSOLE")) != NULL) {
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console = s;
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}
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#if #cpu(sparc)
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/* 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)
console = SERIAL_CON0;
else if (strcmp( s, "ttyb" )==0)
console = SERIAL_CON1;
}
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#endif
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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) {
/* this is a serial console */
snprintf( the_console, sizeof the_console, "/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 );
} else {
console = VT_CONSOLE;
tried_devcons++;
}
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}
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while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
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/* Can't open selected console -- try /dev/console */
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if (!tried_devcons) {
tried_devcons++;
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console = VT_CONSOLE;
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continue;
}
/* Can't open selected console -- try vt1 */
if (!tried_vtprimary) {
tried_vtprimary++;
console = VT_PRIMARY;
continue;
}
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break;
}
if (fd < 0)
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/* Perhaps we should panic here? */
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console = "/dev/null";
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else {
/* check for serial console and disable logging to tty3 & running a
* shell to tty2 */
if (ioctl(0,TIOCGSERIAL,&sr) == 0) {
log = NULL;
second_console = NULL;
}
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close(fd);
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}
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message(LOG, "console=%s\n", console );
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}
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static int waitfor(int pid)
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{
int status, wpid;
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message(LOG, "Waiting for process %d.\n", pid);
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while ((wpid = wait(&status)) != pid) {
if (wpid > 0)
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message(LOG, "pid %d exited, status=0x%x.\n", wpid, status);
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}
return wpid;
}
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static pid_t run(const char * const* command,
char *terminal, int get_enter)
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{
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int fd;
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pid_t pid;
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const char * const* cmd = command+1;
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static const char press_enter[] =
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"\nPlease press Enter to activate this console. ";
if ((pid = fork()) == 0) {
/* Clean up */
close(0);
close(1);
close(2);
setsid();
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/* Reset signal handlers set for parent process */
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
if ((fd = device_open(terminal, O_RDWR)) < 0) {
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message(LOG, "Bummer, can't open %s\r\n", terminal);
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exit(-1);
}
dup(fd);
dup(fd);
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tcsetpgrp(0, getpgrp());
set_term(0);
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if (get_enter==TRUE) {
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/*
* 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.
*/
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char c;
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message(LOG, "Waiting for enter to start '%s' (pid %d, console %s)\r\n",
*cmd, getpid(), terminal );
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write(1, press_enter, sizeof(press_enter) - 1);
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read(0, &c, 1);
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}
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/* Log the process name and args */
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message(LOG, "Starting pid %d, console %s: '", getpid(), terminal);
while ( *cmd) message(LOG, "%s ", *cmd++);
message(LOG, "'\r\n");
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/* Now run it. The new program will take over this PID,
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* so nothing further in init.c should be run. */
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execvp(*command, (char**)command+1);
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message(LOG, "Bummer, could not run '%s'\n", command);
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exit(-1);
}
return pid;
}
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/* 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};
if (mem_total() > 3500)
return;
if (stat("/etc/fstab", &statbuf) == 0) {
/* Try to turn on swap */
waitfor(run(swap_on_cmd, log, FALSE));
if (mem_total() < 3500)
goto goodnight;
} else
goto goodnight;
return;
goodnight:
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message(CONSOLE, "Sorry, your computer does not have enough memory.\r\n");
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while (1) sleep(1);
}
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static void shutdown_system(void)
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{
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const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 0};
const char* const umount_cmd[] = { "umount", "umount", "-a", "-n", 0};
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#ifndef DEBUG_INIT
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/* Allow Ctrl-Alt-Del to reboot system. */
reboot(RB_ENABLE_CAD);
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#endif
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message(CONSOLE, "The system is going down NOW !!\r\n");
sync();
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/* Send signals to every process _except_ pid 1 */
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message(CONSOLE, "Sending SIGHUP to all processes.\r\n");
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#ifndef DEBUG_INIT
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kill(-1, SIGHUP);
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#endif
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sleep(2);
sync();
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message(CONSOLE, "Sending SIGKILL to all processes.\r\n");
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#ifndef DEBUG_INIT
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kill(-1, SIGKILL);
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#endif
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sleep(1);
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waitfor(run( swap_off_cmd, console, FALSE));
waitfor(run( umount_cmd, console, FALSE));
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sync();
if (kernel_version > 0 && kernel_version <= 2 * 65536 + 2 * 256 + 11) {
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/* bdflush, kupdate not needed for kernels >2.2.11 */
message(CONSOLE, "Flushing buffers.\r\n");
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bdflush(1, 0);
sync();
}
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}
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static void halt_signal(int sig)
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{
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shutdown_system();
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message(CONSOLE,
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"The system is halted. Press CTRL-ALT-DEL or turn off power\r\n");
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sync();
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#ifndef DEBUG_INIT
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reboot(RB_HALT_SYSTEM);
//reboot(RB_POWER_OFF);
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#endif
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exit(0);
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}
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static void reboot_signal(int sig)
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{
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shutdown_system();
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message(CONSOLE, "Please stand by while rebooting the system.\r\n");
sync();
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#ifndef DEBUG_INIT
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reboot(RB_AUTOBOOT);
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#endif
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exit(0);
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}
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extern int init_main(int argc, char **argv)
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{
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int run_rc = TRUE;
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int wait_for_enter = TRUE;
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pid_t pid1 = 0;
pid_t pid2 = 0;
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struct stat statbuf;
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const char* const init_commands[] = { INITSCRIPT, INITSCRIPT, 0};
const char* const shell_commands[] = { SHELL, "-" SHELL, 0};
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const char* const* tty0_commands = shell_commands;
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const char* const* tty1_commands = shell_commands;
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#ifdef DEBUG_INIT
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char *hello_msg_format =
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"init(%d) started: BusyBox v%s (%s) multi-call binary\r\n";
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#else
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char *hello_msg_format =
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"init started: BusyBox v%s (%s) multi-call binary\r\n";
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#endif
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#ifndef DEBUG_INIT
if (getpid() != 1) {
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
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/* 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;
}
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/* Set up sig handlers -- be sure to
* clear all of these in run() */
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signal(SIGUSR1, halt_signal);
signal(SIGUSR2, reboot_signal);
signal(SIGINT, reboot_signal);
signal(SIGTERM, reboot_signal);
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/* Turn off rebooting via CTL-ALT-DEL -- we get a
* SIGINT on CAD so we can shut things down gracefully... */
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#ifndef DEBUG_INIT
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reboot(RB_DISABLE_CAD);
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#endif
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/* Figure out where the default console should be */
console_init();
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/* Close whatever files are open, and reset the console. */
close(0);
close(1);
close(2);
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set_term(0);
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setsid();
/* Make sure PATH is set to something sane */
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putenv(PATH_DEFAULT);
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/* Hello world */
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#ifndef DEBUG_INIT
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message(CONSOLE|LOG, hello_msg_format, BB_VER, BB_BT);
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#else
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message(CONSOLE|LOG, hello_msg_format, getpid(), BB_VER, BB_BT);
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#endif
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/* Mount /proc */
if (mount ("proc", "/proc", "proc", 0, 0) == 0) {
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message(CONSOLE|LOG, "Mounting /proc: done.\n");
kernel_version = get_kernel_revision();
} else
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message(CONSOLE|LOG, "Mounting /proc: failed!\n");
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/* Make sure there is enough memory to do something useful. */
check_memory();
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/* Make sure an init script exists before trying to run it */
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if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)==0) {
wait_for_enter = FALSE;
tty0_commands = init_commands;
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}
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/* Ok, now launch the rc script and/or prepare to
* start up some VTs if somebody hits enter...
*/
for (;;) {
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pid_t wpid;
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int status;
if (pid1 == 0 && tty0_commands) {
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pid1 = run(tty0_commands, console, wait_for_enter);
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}
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if (pid2 == 0 && tty1_commands && second_console) {
pid2 = run(tty1_commands, second_console, TRUE);
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}
wpid = wait(&status);
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if (wpid > 0 ) {
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message(LOG, "pid %d exited, status=%x.\n", wpid, status);
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}
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/* Don't respawn init script if it exits */
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if (wpid == pid1) {
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if (run_rc == FALSE) {
pid1 = 0;
}
#if 0
/* Turn this on to start a shell on the console if the init script exits.... */
else {
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run_rc=FALSE;
wait_for_enter=TRUE;
tty0_commands=shell_commands;
}
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#endif
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}
if (wpid == pid2) {
pid2 = 0;
}
sleep(1);
}
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}