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. 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 * @(#) Copyright (c) 1980, 1986, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)reboot.c 8.1 (Berkeley) 6/5/93
31 * $FreeBSD: src/sbin/reboot/reboot.c,v 1.9.2.4 2002/04/28 22:50:00 wes Exp $
32 */
33
34 #include <sys/reboot.h>
35 #include <sys/types.h>
36 #include <sys/sysctl.h>
37 #include <signal.h>
38 #include <err.h>
39 #include <errno.h>
40 #include <fcntl.h>
41 #include <libutil.h>
42 #include <pwd.h>
43 #include <syslog.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <unistd.h>
48 #include <utmpx.h>
49
50 static void usage(void) __dead2;
51 static u_int get_pageins(void);
52
53 static int dohalt;
54
55 int
main(int argc,char * argv[])56 main(int argc, char *argv[])
57 {
58 struct passwd *pw;
59 int ch, howto, i, lflag, nflag, qflag, sverrno;
60 u_int pageins;
61 char *p;
62 const char *user;
63
64 if (strstr((p = strrchr(*argv, '/')) ? p + 1 : *argv, "halt")) {
65 dohalt = 1;
66 howto = RB_HALT;
67 } else
68 howto = 0;
69 lflag = nflag = qflag = 0;
70 while ((ch = getopt(argc, argv, "dlnpq")) != -1)
71 switch(ch) {
72 case 'd':
73 howto |= RB_DUMP;
74 break;
75 case 'l':
76 lflag = 1;
77 break;
78 case 'n':
79 nflag = 1;
80 howto |= RB_NOSYNC;
81 break;
82 case 'p':
83 howto |= (RB_POWEROFF | RB_HALT);
84 break;
85 case 'q':
86 qflag = 1;
87 break;
88 case '?':
89 default:
90 usage();
91 }
92 argc -= optind;
93 argv += optind;
94 if (argc != 0)
95 usage();
96
97 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
98 errx(1, "cannot dump (-d) when halting; must reboot instead");
99 if (geteuid()) {
100 errno = EPERM;
101 err(1, NULL);
102 }
103
104 if (qflag) {
105 reboot(howto);
106 err(1, NULL);
107 }
108
109 /* Log the reboot. */
110 if (!lflag) {
111 if ((user = getlogin()) == NULL)
112 user = (pw = getpwuid(getuid())) ?
113 pw->pw_name : "???";
114 if (dohalt) {
115 openlog("halt", 0, LOG_AUTH | LOG_CONS);
116 syslog(LOG_CRIT, "halted by %s", user);
117 } else {
118 openlog("reboot", 0, LOG_AUTH | LOG_CONS);
119 syslog(LOG_CRIT, "rebooted by %s", user);
120 }
121 }
122 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS);
123
124 /*
125 * Do a sync early on, so disks start transfers while we're off
126 * killing processes. Don't worry about writes done before the
127 * processes die, the reboot system call syncs the disks.
128 */
129 if (!nflag)
130 sync();
131
132 /* Just stop init -- if we fail, we'll restart it. */
133 if (kill(1, SIGTSTP) == -1)
134 err(1, "SIGTSTP init");
135
136 /* Ignore the SIGHUP we get when our parent shell dies. */
137 signal(SIGHUP, SIG_IGN);
138 /* parent shell might also send a SIGTERM? Best to ignore as well */
139 signal(SIGTERM, SIG_IGN);
140 /* Group leaders may try killing us with other signals, ignore */
141 signal(SIGINT, SIG_IGN);
142 signal(SIGQUIT, SIG_IGN);
143 signal(SIGTSTP, SIG_IGN);
144
145 /*
146 * If we're running in a pipeline, we don't want to die
147 * after killing whatever we're writing to.
148 */
149 signal(SIGPIPE, SIG_IGN);
150
151 /* Send a SIGTERM first, a chance to save the buffers. */
152 if (kill(-1, SIGTERM) == -1)
153 err(1, "SIGTERM processes");
154
155 /*
156 * After the processes receive the signal, start the rest of the
157 * buffers on their way. Wait 5 seconds between the SIGTERM and
158 * the SIGKILL to give everybody a chance. If there is a lot of
159 * paging activity then wait longer, up to a maximum of approx
160 * 60 seconds.
161 */
162 sleep(2);
163 for (i = 0; i < 20; i++) {
164 pageins = get_pageins();
165 if (!nflag)
166 sync();
167 sleep(3);
168 if (get_pageins() == pageins)
169 break;
170 }
171
172 for (i = 1;; ++i) {
173 if (kill(-1, SIGKILL) == -1) {
174 if (errno == ESRCH)
175 break;
176 goto restart;
177 }
178 if (i > 5) {
179 fprintf(stderr,
180 "WARNING: some process(es) wouldn't die\n");
181 break;
182 }
183 sleep(2 * i);
184 }
185
186 reboot(howto);
187 /* FALLTHROUGH */
188
189 restart:
190 sverrno = errno;
191 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
192 strerror(sverrno));
193 /* NOTREACHED */
194 }
195
196 static void
usage(void)197 usage(void)
198 {
199 fprintf(stderr, "usage: %s [-dnpq]\n", dohalt ? "halt" : "reboot");
200 exit(1);
201 }
202
203 static u_int
get_pageins(void)204 get_pageins(void)
205 {
206 u_int pageins;
207 size_t len;
208
209 len = sizeof(pageins);
210 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
211 != 0) {
212 warnx("v_swappgsin");
213 return (0);
214 }
215 return pageins;
216 }
217