reboot.c revision 74525 
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  "$FreeBSD: head/sbin/reboot/reboot.c 74525 2001-03-20 17:22:48Z iedowse $";
46#endif /* not lint */
47
48#include <sys/reboot.h>
49#include <sys/types.h>
50#include <sys/sysctl.h>
51#include <signal.h>
52#include <err.h>
53#include <errno.h>
54#include <libutil.h>
55#include <pwd.h>
56#include <syslog.h>
57#include <stdio.h>
58#include <string.h>
59#include <unistd.h>
60
61void usage(void);
62u_int get_pageins(void);
63
64int dohalt;
65
66int
67main(int argc, char *argv[])
68{
69	struct passwd *pw;
70	int ch, howto, i, lflag, nflag, qflag, pflag, sverrno;
71	u_int pageins;
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, "dlnpq")) != -1)
81		switch(ch) {
82		case 'd':
83			howto |= RB_DUMP;
84			break;
85		case 'l':		/* Undocumented; used by shutdown. */
86			lflag = 1;
87			break;
88		case 'n':
89			nflag = 1;
90			howto |= RB_NOSYNC;
91			break;
92		case 'p':
93			pflag = 1;
94			howto |= (RB_POWEROFF | RB_HALT);
95			break;
96		case 'q':
97			qflag = 1;
98			break;
99		case '?':
100		default:
101			usage();
102		}
103	argc -= optind;
104	argv += optind;
105
106	if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
107		errx(1, "cannot dump (-d) when halting; must reboot instead");
108	if (geteuid()) {
109		errno = EPERM;
110		err(1, NULL);
111	}
112
113	if (qflag) {
114		reboot(howto);
115		err(1, NULL);
116	}
117
118	/* Log the reboot. */
119	if (!lflag)  {
120		if ((user = getlogin()) == NULL)
121			user = (pw = getpwuid(getuid())) ?
122			    pw->pw_name : "???";
123		if (dohalt) {
124			openlog("halt", 0, LOG_AUTH | LOG_CONS);
125			syslog(LOG_CRIT, "halted by %s", user);
126		} else {
127			openlog("reboot", 0, LOG_AUTH | LOG_CONS);
128			syslog(LOG_CRIT, "rebooted by %s", user);
129		}
130	}
131	logwtmp("~", "shutdown", "");
132
133	/*
134	 * Do a sync early on, so disks start transfers while we're off
135	 * killing processes.  Don't worry about writes done before the
136	 * processes die, the reboot system call syncs the disks.
137	 */
138	if (!nflag)
139		sync();
140
141	/* Just stop init -- if we fail, we'll restart it. */
142	if (kill(1, SIGTSTP) == -1)
143		err(1, "SIGTSTP init");
144
145	/* Ignore the SIGHUP we get when our parent shell dies. */
146	(void)signal(SIGHUP, SIG_IGN);
147
148	/* Send a SIGTERM first, a chance to save the buffers. */
149	if (kill(-1, SIGTERM) == -1)
150		err(1, "SIGTERM processes");
151
152	/*
153	 * After the processes receive the signal, start the rest of the
154	 * buffers on their way.  Wait 5 seconds between the SIGTERM and
155	 * the SIGKILL to give everybody a chance. If there is a lot of
156	 * paging activity then wait longer, up to a maximum of approx
157	 * 60 seconds.
158	 */
159	sleep(2);
160	for (i = 0; i < 20; i++) {
161		pageins = get_pageins();
162		if (!nflag)
163			sync();
164		sleep(3);
165		if (get_pageins() == pageins)
166			break;
167	}
168
169	for (i = 1;; ++i) {
170		if (kill(-1, SIGKILL) == -1) {
171			if (errno == ESRCH)
172				break;
173			goto restart;
174		}
175		if (i > 5) {
176			(void)fprintf(stderr,
177			    "WARNING: some process(es) wouldn't die\n");
178			break;
179		}
180		(void)sleep(2 * i);
181	}
182
183	reboot(howto);
184	/* FALLTHROUGH */
185
186restart:
187	sverrno = errno;
188	errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
189	    strerror(sverrno));
190	/* NOTREACHED */
191}
192
193void
194usage()
195{
196	(void)fprintf(stderr, "usage: %s [-dnpq]\n",
197	    dohalt ? "halt" : "reboot");
198	exit(1);
199}
200
201u_int
202get_pageins()
203{
204	u_int pageins;
205	size_t len;
206
207	len = sizeof(pageins);
208	if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
209	    != 0) {
210		warnx("v_swappgsin");
211		return (0);
212	}
213	return pageins;
214}
215