sbin/reboot/reboot.c

/*
 * Copyright (c) 1980, 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980, 1986 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)reboot.c    5.11 (Berkeley) 2/27/91";
#endif /* not lint */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/syslog.h>
#include <sys/syscall.h>
#include <sys/reboot.h>
#include <sys/signal.h>
#include <pwd.h>
#include <stdio.h>
#include <errno.h>

main(argc, argv)
        int argc;
        char **argv;
{
        int howto;
        register char *argp;
        register i;
        register ok = 0;
        register qflag = 0;
        int needlog = 1;
        char *user, *getlogin();
        struct passwd *pw;

        openlog("reboot", 0, LOG_AUTH);
        argc--, argv++;
        howto = 0;
        while (argc > 0) {
                if (!strcmp(*argv, "-q"))
                        qflag++;
                else if (!strcmp(*argv, "-n"))
                        howto |= RB_NOSYNC;
                else if (!strcmp(*argv, "-l"))
                        needlog = 0;
                else {
                        fprintf(stderr,
                            "usage: reboot [ -n ][ -q ]\n");
                        exit(1);
                }
                argc--, argv++;
        }

        if (needlog) {
                user = getlogin();
                if (user == (char *)0 && (pw = getpwuid(getuid())))
                        user = pw->pw_name;
                if (user == (char *)0)
                        user = "root";
                syslog(LOG_CRIT, "rebooted by %s", user);
        }

        signal(SIGHUP, SIG_IGN);        /* for remote connections */
        if (kill(1, SIGTSTP) == -1) {
                fprintf(stderr, "reboot: can't idle init\n");
                exit(1);
        }
        sleep(1);
        (void) kill(-1, SIGTERM);       /* one chance to catch it */
        sleep(5);

        if (!qflag) for (i = 1; ; i++) {
                if (kill(-1, SIGKILL) == -1) {
                        extern int errno;

                        if (errno == ESRCH)
                                break;

                        perror("reboot: kill");
                        kill(1, SIGHUP);
                        exit(1);
                }
                if (i > 5) {
                        fprintf(stderr,
                            "CAUTION: some process(es) wouldn't die\n");
                        break;
                }
                setalarm(2 * i);
                pause();
        }

        if (!qflag && (howto & RB_NOSYNC) == 0) {
                logwtmp("~", "shutdown", "");
                sync();
                setalarm(5);
                pause();
        }
        syscall(SYS_reboot, howto);
        perror("reboot");
        kill(1, SIGHUP);
        exit(1);
}

void
dingdong()
{
        /* RRRIIINNNGGG RRRIIINNNGGG */
}

setalarm(n)
        int n;
{
        signal(SIGALRM, dingdong);
        alarm(n);
}