reboot.c revision 104572 
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 104572 2002-10-06 16:24:36Z thomas $";
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 <fcntl.h>
55#include <libutil.h>
56#include <pwd.h>
57#include <syslog.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <unistd.h>
62
63void usage(void);
64u_int get_pageins(void);
65
66int dohalt;
67
68int
69main(int argc, char *argv[])
70{
71	struct passwd *pw;
72	int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno;
73	u_int pageins;
74	char *kernel, *p;
75	const char *user;
76
77	if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
78		dohalt = 1;
79		howto = RB_HALT;
80	} else
81		howto = 0;
82	kflag = lflag = nflag = qflag = 0;
83	while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
84		switch(ch) {
85		case 'd':
86			howto |= RB_DUMP;
87			break;
88		case 'k':
89			kflag = 1;
90			kernel = optarg;
91			break;
92		case 'l':
93			lflag = 1;
94			break;
95		case 'n':
96			nflag = 1;
97			howto |= RB_NOSYNC;
98			break;
99		case 'p':
100			pflag = 1;
101			howto |= RB_POWEROFF;
102			break;
103		case 'q':
104			qflag = 1;
105			break;
106		case '?':
107		default:
108			usage();
109		}
110	argc -= optind;
111	argv += optind;
112
113	if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
114		errx(1, "cannot dump (-d) when halting; must reboot instead");
115	if (geteuid()) {
116		errno = EPERM;
117		err(1, NULL);
118	}
119
120	if (qflag) {
121		reboot(howto);
122		err(1, NULL);
123	}
124
125	if (kflag) {
126		fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
127		if (fd > -1) {
128			(void)write(fd, "nextboot_enable=\"YES\"\n", 22);
129			(void)write(fd, "kernel=\"", 8L);
130			(void)write(fd, kernel, strlen(kernel));
131			(void)write(fd, "\"\n", 2);
132			close(fd);
133		}
134	}
135
136	/* Log the reboot. */
137	if (!lflag)  {
138		if ((user = getlogin()) == NULL)
139			user = (pw = getpwuid(getuid())) ?
140			    pw->pw_name : "???";
141		if (dohalt) {
142			openlog("halt", 0, LOG_AUTH | LOG_CONS);
143			syslog(LOG_CRIT, "halted by %s", user);
144		} else {
145			openlog("reboot", 0, LOG_AUTH | LOG_CONS);
146			syslog(LOG_CRIT, "rebooted by %s", user);
147		}
148	}
149	logwtmp("~", "shutdown", "");
150
151	/*
152	 * Do a sync early on, so disks start transfers while we're off
153	 * killing processes.  Don't worry about writes done before the
154	 * processes die, the reboot system call syncs the disks.
155	 */
156	if (!nflag)
157		sync();
158
159	/* Just stop init -- if we fail, we'll restart it. */
160	if (kill(1, SIGTSTP) == -1)
161		err(1, "SIGTSTP init");
162
163	/* Ignore the SIGHUP we get when our parent shell dies. */
164	(void)signal(SIGHUP, SIG_IGN);
165
166	/* Send a SIGTERM first, a chance to save the buffers. */
167	if (kill(-1, SIGTERM) == -1)
168		err(1, "SIGTERM processes");
169
170	/*
171	 * After the processes receive the signal, start the rest of the
172	 * buffers on their way.  Wait 5 seconds between the SIGTERM and
173	 * the SIGKILL to give everybody a chance. If there is a lot of
174	 * paging activity then wait longer, up to a maximum of approx
175	 * 60 seconds.
176	 */
177	sleep(2);
178	for (i = 0; i < 20; i++) {
179		pageins = get_pageins();
180		if (!nflag)
181			sync();
182		sleep(3);
183		if (get_pageins() == pageins)
184			break;
185	}
186
187	for (i = 1;; ++i) {
188		if (kill(-1, SIGKILL) == -1) {
189			if (errno == ESRCH)
190				break;
191			goto restart;
192		}
193		if (i > 5) {
194			(void)fprintf(stderr,
195			    "WARNING: some process(es) wouldn't die\n");
196			break;
197		}
198		(void)sleep(2 * i);
199	}
200
201	reboot(howto);
202	/* FALLTHROUGH */
203
204restart:
205	sverrno = errno;
206	errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
207	    strerror(sverrno));
208	/* NOTREACHED */
209}
210
211void
212usage()
213{
214	(void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
215	    dohalt ? "halt" : "reboot");
216	exit(1);
217}
218
219u_int
220get_pageins()
221{
222	u_int pageins;
223	size_t len;
224
225	len = sizeof(pageins);
226	if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
227	    != 0) {
228		warnx("v_swappgsin");
229		return (0);
230	}
231	return pageins;
232}
233