shutdown.c

linux 安装程序

/*
 * shutdown.c
 *
 * Shutdown a running system.  If built with -DAS_SHUTDOWN=1, then
 * it builds a standalone shutdown binary.
 *
 * Copyright 1996 - 2003 Red Hat, Inc.
 *
 * This software may be freely redistributed under the terms of the GNU
 * public license.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/reboot.h>
#include <sys/types.h>
#include <unistd.h>

#ifdef AS_SHUTDOWN
int testing = 0;
#else
extern int testing;
#endif

void disableSwap(void);
void unmountFilesystems(void);

static void rebootHandler(int signum) {
    printf("rebooting system\n");
#if USE_MINILIBC
    reboot(0xfee1dead, 672274793, 0x1234567);
#else
    reboot(RB_AUTOBOOT);
#endif
}

void shutDown(int noKill, int doReboot, int doPowerOff) {
    sync(); sync();

    if (!testing && !noKill) {
	printf("sending termination signals...");
	kill(-1, 15);
	sleep(2);
	printf("done\n");

	printf("sending kill signals...");
	kill(-1, 9);
	sleep(2);
	printf("done\n");
    }

    printf("disabling swap...\n");
    disableSwap();

    printf("unmounting filesystems...\n"); 
    unmountFilesystems();

    if (doReboot) {
	printf("rebooting system\n");
	sleep(2);

#if USE_MINILIBC
	reboot(0xfee1dead, 672274793, 0x1234567);
#else
	reboot(RB_AUTOBOOT);
#endif
    } else if (doPowerOff)  {
        printf("powering off system\n");
        reboot(RB_POWER_OFF);
    } else {
	printf("you may safely reboot your system\n");
        signal(SIGINT, rebootHandler);
        while (1) sleep(60);
    }

    exit(0);

    return;
}

#ifdef AS_SHUTDOWN
int main(int argc, char ** argv) {
    int fd;
    int doReboot = 0;
    int i = 1;

    while (i < argc) {
      if (!strncmp("-r", argv[i], 2))
	doReboot = 1;
      i++;
    }

    /* ignore some signals so we don't kill ourself */
    signal(SIGINT, SIG_IGN);
    signal(SIGTSTP, SIG_IGN);

    /* now change to / */
    i = chdir("/");

    /* redirect output to the real console */
    fd = open("/dev/console", O_RDWR);
    dup2(fd, 0);
    dup2(fd, 1);
    dup2(fd, 2);
    close(fd);

    shutDown(0, doReboot, 0);
    return 0;
}
#endif