reboot.c revision 37674 
1/*
2 * Copyright (c) 1980, 1986, 1993
3 *	The Regents of the University of California.  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
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1986, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)reboot.c	8.1 (Berkeley) 6/5/93";
43#endif
44static const char rcsid[] =
45	"$Id$";
46#endif /* not lint */
47
48#include <sys/reboot.h>
49#include <sys/types.h>
50#include <signal.h>
51#include <err.h>
52#include <errno.h>
53#include <libutil.h>
54#include <pwd.h>
55#include <syslog.h>
56#include <stdio.h>
57#include <string.h>
58#include <unistd.h>
59
60void usage __P((void));
61
62int dohalt;
63
64int
65main(argc, argv)
66	int argc;
67	char *argv[];
68{
69	register int i;
70	struct passwd *pw;
71	int ch, howto, lflag, nflag, qflag, pflag, sverrno;
72	char *p, *user;
73
74	if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
75		dohalt = 1;
76		howto = RB_HALT;
77	} else
78		howto = 0;
79	lflag = nflag = qflag = 0;
80	while ((ch = getopt(argc, argv, "lnpq")) != -1)
81		switch(ch) {
82		case 'l':		/* Undocumented; used by shutdown. */
83			lflag = 1;
84			break;
85		case 'n':
86			nflag = 1;
87			howto |= RB_NOSYNC;
88			break;
89		case 'p':
90			pflag = 1;
91			howto |= (RB_POWEROFF | RB_HALT);
92			break;
93		case 'q':
94			qflag = 1;
95			break;
96		case '?':
97		default:
98			usage();
99		}
100	argc -= optind;
101	argv += optind;
102
103	if (geteuid()) {
104		errno = EPERM;
105		err(1, NULL);
106	}
107
108	if (qflag) {
109		reboot(howto);
110		err(1, NULL);
111	}
112
113	/* Log the reboot. */
114	if (!lflag)  {
115		if ((user = getlogin()) == NULL)
116			user = (pw = getpwuid(getuid())) ?
117			    pw->pw_name : "???";
118		if (dohalt) {
119			openlog("halt", 0, LOG_AUTH | LOG_CONS);
120			syslog(LOG_CRIT, "halted by %s", user);
121		} else {
122			openlog("reboot", 0, LOG_AUTH | LOG_CONS);
123			syslog(LOG_CRIT, "rebooted by %s", user);
124		}
125	}
126	logwtmp("~", "shutdown", "");
127
128	/*
129	 * Do a sync early on, so disks start transfers while we're off
130	 * killing processes.  Don't worry about writes done before the
131	 * processes die, the reboot system call syncs the disks.
132	 */
133	if (!nflag)
134		sync();
135
136	/* Just stop init -- if we fail, we'll restart it. */
137	if (kill(1, SIGTSTP) == -1)
138		err(1, "SIGTSTP init");
139
140	/* Ignore the SIGHUP we get when our parent shell dies. */
141	(void)signal(SIGHUP, SIG_IGN);
142
143	/* Send a SIGTERM first, a chance to save the buffers. */
144	if (kill(-1, SIGTERM) == -1)
145		err(1, "SIGTERM processes");
146
147	/*
148	 * After the processes receive the signal, start the rest of the
149	 * buffers on their way.  Wait 5 seconds between the SIGTERM and
150	 * the SIGKILL to give everybody a chance.
151	 */
152	sleep(2);
153	if (!nflag)
154		sync();
155	sleep(3);
156
157	for (i = 1;; ++i) {
158		if (kill(-1, SIGKILL) == -1) {
159			if (errno == ESRCH)
160				break;
161			goto restart;
162		}
163		if (i > 5) {
164			(void)fprintf(stderr,
165			    "WARNING: some process(es) wouldn't die\n");
166			break;
167		}
168		(void)sleep(2 * i);
169	}
170
171	reboot(howto);
172	/* FALLTHROUGH */
173
174restart:
175	sverrno = errno;
176	errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
177	    strerror(sverrno));
178	/* NOTREACHED */
179}
180
181void
182usage()
183{
184	(void)fprintf(stderr, "usage: %s [-npq]\n", dohalt ? "halt" : "reboot");
185	exit(1);
186}
187