reboot.c revision 128073 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static const char copyright[] =
33"@(#) Copyright (c) 1980, 1986, 1993\n\
34	The Regents of the University of California.  All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char sccsid[] = "@(#)reboot.c	8.1 (Berkeley) 6/5/93";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/sbin/reboot/reboot.c 128073 2004-04-09 19:58:40Z markm $");
43
44#include <sys/reboot.h>
45#include <sys/types.h>
46#include <sys/sysctl.h>
47#include <signal.h>
48#include <err.h>
49#include <errno.h>
50#include <fcntl.h>
51#include <libutil.h>
52#include <pwd.h>
53#include <syslog.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59void usage(void);
60u_int get_pageins(void);
61
62int dohalt;
63
64int
65main(int argc, char *argv[])
66{
67	struct passwd *pw;
68	int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno;
69	u_int pageins;
70	char *kernel, *p;
71	const char *user;
72
73	if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
74		dohalt = 1;
75		howto = RB_HALT;
76	} else
77		howto = 0;
78	kflag = lflag = nflag = qflag = 0;
79	while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
80		switch(ch) {
81		case 'd':
82			howto |= RB_DUMP;
83			break;
84		case 'k':
85			kflag = 1;
86			kernel = optarg;
87			break;
88		case 'l':
89			lflag = 1;
90			break;
91		case 'n':
92			nflag = 1;
93			howto |= RB_NOSYNC;
94			break;
95		case 'p':
96			pflag = 1;
97			howto |= RB_POWEROFF;
98			break;
99		case 'q':
100			qflag = 1;
101			break;
102		case '?':
103		default:
104			usage();
105		}
106	argc -= optind;
107	argv += optind;
108
109	if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
110		errx(1, "cannot dump (-d) when halting; must reboot instead");
111	if (geteuid()) {
112		errno = EPERM;
113		err(1, NULL);
114	}
115
116	if (qflag) {
117		reboot(howto);
118		err(1, NULL);
119	}
120
121	if (kflag) {
122		fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
123		if (fd > -1) {
124			(void)write(fd, "nextboot_enable=\"YES\"\n", 22);
125			(void)write(fd, "kernel=\"", 8L);
126			(void)write(fd, kernel, strlen(kernel));
127			(void)write(fd, "\"\n", 2);
128			close(fd);
129		}
130	}
131
132	/* Log the reboot. */
133	if (!lflag)  {
134		if ((user = getlogin()) == NULL)
135			user = (pw = getpwuid(getuid())) ?
136			    pw->pw_name : "???";
137		if (dohalt) {
138			openlog("halt", 0, LOG_AUTH | LOG_CONS);
139			syslog(LOG_CRIT, "halted by %s", user);
140		} else {
141			openlog("reboot", 0, LOG_AUTH | LOG_CONS);
142			syslog(LOG_CRIT, "rebooted by %s", user);
143		}
144	}
145	logwtmp("~", "shutdown", "");
146
147	/*
148	 * Do a sync early on, so disks start transfers while we're off
149	 * killing processes.  Don't worry about writes done before the
150	 * processes die, the reboot system call syncs the disks.
151	 */
152	if (!nflag)
153		sync();
154
155	/* Just stop init -- if we fail, we'll restart it. */
156	if (kill(1, SIGTSTP) == -1)
157		err(1, "SIGTSTP init");
158
159	/* Ignore the SIGHUP we get when our parent shell dies. */
160	(void)signal(SIGHUP, SIG_IGN);
161
162	/* Send a SIGTERM first, a chance to save the buffers. */
163	if (kill(-1, SIGTERM) == -1 && errno != ESRCH)
164		err(1, "SIGTERM processes");
165
166	/*
167	 * After the processes receive the signal, start the rest of the
168	 * buffers on their way.  Wait 5 seconds between the SIGTERM and
169	 * the SIGKILL to give everybody a chance. If there is a lot of
170	 * paging activity then wait longer, up to a maximum of approx
171	 * 60 seconds.
172	 */
173	sleep(2);
174	for (i = 0; i < 20; i++) {
175		pageins = get_pageins();
176		if (!nflag)
177			sync();
178		sleep(3);
179		if (get_pageins() == pageins)
180			break;
181	}
182
183	for (i = 1;; ++i) {
184		if (kill(-1, SIGKILL) == -1) {
185			if (errno == ESRCH)
186				break;
187			goto restart;
188		}
189		if (i > 5) {
190			(void)fprintf(stderr,
191			    "WARNING: some process(es) wouldn't die\n");
192			break;
193		}
194		(void)sleep(2 * i);
195	}
196
197	reboot(howto);
198	/* FALLTHROUGH */
199
200restart:
201	sverrno = errno;
202	errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
203	    strerror(sverrno));
204	/* NOTREACHED */
205}
206
207void
208usage()
209{
210	(void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
211	    dohalt ? "halt" : "reboot");
212	exit(1);
213}
214
215u_int
216get_pageins()
217{
218	u_int pageins;
219	size_t len;
220
221	len = sizeof(pageins);
222	if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
223	    != 0) {
224		warnx("v_swappgsin");
225		return (0);
226	}
227	return pageins;
228}
229