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reboot.c revision 1.5 
      1 /*
      2  * Copyright (c) 1980, 1986 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1980, 1986 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)reboot.c	5.11 (Berkeley) 2/27/91";*/
     42 static char rcsid[] = "$Id: reboot.c,v 1.5 1994/12/18 00:22:53 cgd Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 #include <sys/time.h>
     47 #include <sys/syslog.h>
     48 #include <sys/syscall.h>
     49 #include <sys/reboot.h>
     50 #include <sys/signal.h>
     51 #include <pwd.h>
     52 #include <stdio.h>
     53 #include <errno.h>
     54 #include <signal.h>
     55 #include <unistd.h>
     56 
     57 void setalarm __P((int));
     58 
     59 int
     60 main(argc, argv)
     61 	int argc;
     62 	char **argv;
     63 {
     64 	int howto;
     65 	register i;
     66 	register qflag = 0;
     67 	int needlog = 1;
     68 	char *user, *getlogin();
     69 	struct passwd *pw;
     70 
     71 	openlog("reboot", 0, LOG_AUTH);
     72 	argc--, argv++;
     73 	howto = 0;
     74 	while (argc > 0) {
     75 		if (!strcmp(*argv, "-q"))
     76 			qflag++;
     77 		else if (!strcmp(*argv, "-n"))
     78 			howto |= RB_NOSYNC;
     79 		else if (!strcmp(*argv, "-l"))
     80 			needlog = 0;
     81 		else {
     82 			fprintf(stderr,
     83 			    "usage: reboot [ -n ][ -q ]\n");
     84 			exit(1);
     85 		}
     86 		argc--, argv++;
     87 	}
     88 
     89 	if (needlog) {
     90 		user = getlogin();
     91 		if (user == (char *)0 && (pw = getpwuid(getuid())))
     92 			user = pw->pw_name;
     93 		if (user == (char *)0)
     94 			user = "root";
     95 		syslog(LOG_CRIT, "rebooted by %s", user);
     96 	}
     97 
     98 	signal(SIGHUP, SIG_IGN);	/* for remote connections */
     99 	if (kill(1, SIGTSTP) == -1) {
    100 		fprintf(stderr, "reboot: can't idle init\n");
    101 		exit(1);
    102 	}
    103 	sleep(1);
    104 	(void) kill(-1, SIGTERM);	/* one chance to catch it */
    105 	sleep(5);
    106 
    107 	if (!qflag) for (i = 1; ; i++) {
    108 		if (kill(-1, SIGKILL) == -1) {
    109 			extern int errno;
    110 
    111 			if (errno == ESRCH)
    112 				break;
    113 
    114 			perror("reboot: kill");
    115 			kill(1, SIGHUP);
    116 			exit(1);
    117 		}
    118 		if (i > 5) {
    119 			fprintf(stderr,
    120 			    "CAUTION: some process(es) wouldn't die\n");
    121 			break;
    122 		}
    123 		setalarm(2 * i);
    124 		pause();
    125 	}
    126 
    127 	if (!qflag && (howto & RB_NOSYNC) == 0) {
    128 		logwtmp("~", "shutdown", "");
    129 		sync();
    130 		setalarm(5);
    131 		pause();
    132 	}
    133 	syscall(SYS_reboot, howto);
    134 	perror("reboot");
    135 	kill(1, SIGHUP);
    136 	exit(1);
    137 }
    138 
    139 void
    140 dingdong()
    141 {
    142 	/* RRRIIINNNGGG RRRIIINNNGGG */
    143 }
    144 
    145 void
    146 setalarm(n)
    147 	int n;
    148 {
    149 	signal(SIGALRM, dingdong);
    150 	alarm(n);
    151 }
    152