edit to put into official format; minor gramatical corrections

[unix-history] / usr / src / 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 are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#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	5.6 (Berkeley) %G%";
#endif /* not lint */

/*
 * Reboot
 */
#include <stdio.h>
#include <sys/reboot.h>
#include <errno.h>
#include <signal.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/syslog.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, *getpwuid();

	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(55, howto);
	perror("reboot");
	kill(1, SIGHUP);
	exit(1);
}

dingdong()
{
	/* RRRIIINNNGGG RRRIIINNNGGG */
}

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