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 * @(#) Copyright (c) 1980, 1986, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)reboot.c 8.1 (Berkeley) 6/5/93 35 * $FreeBSD: src/sbin/reboot/reboot.c,v 1.9.2.4 2002/04/28 22:50:00 wes Exp $ 36 */ 37 38 #include <sys/reboot.h> 39 #include <sys/types.h> 40 #include <sys/sysctl.h> 41 #include <signal.h> 42 #include <err.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <libutil.h> 46 #include <pwd.h> 47 #include <syslog.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 void usage(void); 54 u_int get_pageins(void); 55 56 int dohalt; 57 58 int 59 main(int argc, char *argv[]) 60 { 61 struct passwd *pw; 62 int ch, howto, i, fd, kflag, lflag, nflag, qflag, sverrno; 63 u_int pageins; 64 char *kernel = NULL, *p; 65 const char *user; 66 67 if (strstr((p = strrchr(*argv, '/')) ? p + 1 : *argv, "halt")) { 68 dohalt = 1; 69 howto = RB_HALT; 70 } else 71 howto = 0; 72 kflag = lflag = nflag = qflag = 0; 73 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 74 switch(ch) { 75 case 'd': 76 howto |= RB_DUMP; 77 break; 78 case 'k': 79 kflag = 1; 80 kernel = optarg; 81 break; 82 case 'l': 83 lflag = 1; 84 break; 85 case 'n': 86 nflag = 1; 87 howto |= RB_NOSYNC; 88 break; 89 case 'p': 90 howto |= (RB_POWEROFF | RB_HALT); 91 break; 92 case 'q': 93 qflag = 1; 94 break; 95 case '?': 96 default: 97 usage(); 98 } 99 argc -= optind; 100 argv += optind; 101 102 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 103 errx(1, "cannot dump (-d) when halting; must reboot instead"); 104 if (geteuid()) { 105 errno = EPERM; 106 err(1, NULL); 107 } 108 109 if (qflag) { 110 reboot(howto); 111 err(1, NULL); 112 } 113 114 if (kflag) { 115 fd = open("/boot/nextboot.conf", 116 O_WRONLY | O_CREAT | O_TRUNC, 0444); 117 if (fd != -1) { 118 write(fd, "kernel=\"", 8L); 119 write(fd, kernel, strlen(kernel)); 120 write(fd, "\"\n", 2); 121 close(fd); 122 } 123 } 124 125 /* Log the reboot. */ 126 if (!lflag) { 127 if ((user = getlogin()) == NULL) 128 user = (pw = getpwuid(getuid())) ? 129 pw->pw_name : "???"; 130 if (dohalt) { 131 openlog("halt", 0, LOG_AUTH | LOG_CONS); 132 syslog(LOG_CRIT, "halted by %s", user); 133 } else { 134 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 135 syslog(LOG_CRIT, "rebooted by %s", user); 136 } 137 } 138 logwtmp("~", "shutdown", ""); 139 140 /* 141 * Do a sync early on, so disks start transfers while we're off 142 * killing processes. Don't worry about writes done before the 143 * processes die, the reboot system call syncs the disks. 144 */ 145 if (!nflag) 146 sync(); 147 148 /* Just stop init -- if we fail, we'll restart it. */ 149 if (kill(1, SIGTSTP) == -1) 150 err(1, "SIGTSTP init"); 151 152 /* Ignore the SIGHUP we get when our parent shell dies. */ 153 signal(SIGHUP, SIG_IGN); 154 155 /* Send a SIGTERM first, a chance to save the buffers. */ 156 if (kill(-1, SIGTERM) == -1) 157 err(1, "SIGTERM processes"); 158 159 /* 160 * After the processes receive the signal, start the rest of the 161 * buffers on their way. Wait 5 seconds between the SIGTERM and 162 * the SIGKILL to give everybody a chance. If there is a lot of 163 * paging activity then wait longer, up to a maximum of approx 164 * 60 seconds. 165 */ 166 sleep(2); 167 for (i = 0; i < 20; i++) { 168 pageins = get_pageins(); 169 if (!nflag) 170 sync(); 171 sleep(3); 172 if (get_pageins() == pageins) 173 break; 174 } 175 176 for (i = 1;; ++i) { 177 if (kill(-1, SIGKILL) == -1) { 178 if (errno == ESRCH) 179 break; 180 goto restart; 181 } 182 if (i > 5) { 183 fprintf(stderr, 184 "WARNING: some process(es) wouldn't die\n"); 185 break; 186 } 187 sleep(2 * i); 188 } 189 190 reboot(howto); 191 /* FALLTHROUGH */ 192 193 restart: 194 sverrno = errno; 195 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 196 strerror(sverrno)); 197 /* NOTREACHED */ 198 } 199 200 void 201 usage(void) 202 { 203 fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 204 dohalt ? "halt" : "reboot"); 205 exit(1); 206 } 207 208 u_int 209 get_pageins(void) 210 { 211 u_int pageins; 212 size_t len; 213 214 len = sizeof(pageins); 215 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 216 != 0) { 217 warnx("v_swappgsin"); 218 return (0); 219 } 220 return pageins; 221 } 222