386BSD 0.1 development

[unix-history] / usr / src / sbin / halt / halt.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[] = "@(#)halt.c      5.10 (Berkeley) 4/3/91";
#endif /* not lint */

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

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

       howto = RB_HALT;
       ttyn = ttyname(2);
       while ((ch = getopt(argc, argv, "lnqy")) != EOF)
               switch((char)ch) {
               case 'l':               /* undocumented; for shutdown(8) */
                       needlog = 0;
                       break;
               case 'n':
                       howto |= RB_NOSYNC;
                       break;
               case 'q':
                       qflag++;
                       break;
               case 'y':
                       ttyn = 0;
                       break;
               case '?':
               default:
                       fprintf(stderr, "usage: halt [-nqy]\n");
                       exit(1);
               }

       if (ttyn && ttyn[sizeof(_PATH_TTY) - 1] == 'd') {
               fprintf(stderr, "halt: dangerous on a dialup; use ``halt -y'' if you are really sure\n");
               exit(1);
       }

       if (needlog) {
               openlog("halt", 0, LOG_AUTH);
               if ((user = getlogin()) == NULL)
                       if ((pw = getpwuid(getuid())))
                               user = pw->pw_name;
                       else
                               user = "???";
               syslog(LOG_CRIT, "halted by %s", user);
       }

       signal(SIGHUP, SIG_IGN);                /* for network connections */
       if (kill(1, SIGTSTP) == -1) {
               fprintf(stderr, "halt: 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("halt: 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();
       }
       reboot(howto);
       perror("halt");
}

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

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