BSD 4_3 release

[unix-history] / usr / src / etc / halt.c

/*
* Copyright (c) 1980,1986 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

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

#ifndef lint
static char sccsid[] = "@(#)halt.c      5.4 (Berkeley) 5/26/86";
#endif not lint

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

main(argc, argv)
       int argc;
       char **argv;
{
       int howto;
       char *ttyn = (char *)ttyname(2);
       register i;
       register qflag = 0;
       int needlog = 1;
       char *user, *getlogin();
       struct passwd *pw, *getpwuid();

       openlog("halt", 0, LOG_AUTH);
       howto = RB_HALT;
       argc--, argv++;
       while (argc > 0) {
               if (!strcmp(*argv, "-n"))
                       howto |= RB_NOSYNC;
               else if (!strcmp(*argv, "-y"))
                       ttyn = 0;
               else if (!strcmp(*argv, "-q"))
                       qflag++;
               else if (!strcmp(*argv, "-l"))
                       needlog = 0;
               else {
                       fprintf(stderr, "usage: halt [ -n ]\n");
                       exit(1);
               }
               argc--, argv++;
       }
       if (ttyn && *(ttyn+strlen("/dev/tty")) == 'd') {
               fprintf(stderr, "halt: dangerous on a dialup; use ``halt -y'' if you are really sure\n");
               exit(1);
       }

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

       signal(SIGHUP, SIG_IGN);                /* for network 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) {
               markdown();
               sync();
               setalarm(5);
               pause();
       }
       syscall(55, howto);
       perror("reboot");
}

dingdong()
{
       /* RRRIIINNNGGG RRRIIINNNGGG */
}

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

#include <utmp.h>
#define SCPYN(a, b)     strncpy(a, b, sizeof(a))
char    wtmpf[] = "/usr/adm/wtmp";
struct utmp wtmp;

markdown()
{
       register f = open(wtmpf, 1);
       if (f >= 0) {
               lseek(f, 0L, 2);
               SCPYN(wtmp.ut_line, "~");
               SCPYN(wtmp.ut_name, "shutdown");
               SCPYN(wtmp.ut_host, "");
               time(&wtmp.ut_time);
               write(f, (char *)&wtmp, sizeof(wtmp));
               close(f);
       }
}