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 * $DragonFly: src/sbin/reboot/reboot.c,v 1.4 2004/08/30 19:27:21 eirikn Exp $ 37 */ 38 39 #include <sys/reboot.h> 40 #include <sys/types.h> 41 #include <sys/sysctl.h> 42 #include <signal.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <libutil.h> 47 #include <pwd.h> 48 #include <syslog.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 void usage(void); 55 u_int get_pageins(void); 56 57 int dohalt; 58 59 int 60 main(int argc, char *argv[]) 61 { 62 struct passwd *pw; 63 int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno; 64 u_int pageins; 65 char *kernel, *p; 66 const char *user; 67 68 if (strstr((p = strrchr(*argv, '/')) ? p + 1 : *argv, "halt")) { 69 dohalt = 1; 70 howto = RB_HALT; 71 } else 72 howto = 0; 73 kflag = lflag = nflag = qflag = 0; 74 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 75 switch(ch) { 76 case 'd': 77 howto |= RB_DUMP; 78 break; 79 case 'k': 80 kflag = 1; 81 kernel = optarg; 82 break; 83 case 'l': 84 lflag = 1; 85 break; 86 case 'n': 87 nflag = 1; 88 howto |= RB_NOSYNC; 89 break; 90 case 'p': 91 pflag = 1; 92 howto |= (RB_POWEROFF | RB_HALT); 93 break; 94 case 'q': 95 qflag = 1; 96 break; 97 case '?': 98 default: 99 usage(); 100 } 101 argc -= optind; 102 argv += optind; 103 104 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 105 errx(1, "cannot dump (-d) when halting; must reboot instead"); 106 if (geteuid()) { 107 errno = EPERM; 108 err(1, NULL); 109 } 110 111 if (qflag) { 112 reboot(howto); 113 err(1, NULL); 114 } 115 116 if (kflag) { 117 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444); 118 if (fd > -1) { 119 (void)write(fd, "kernel=\"", 8L); 120 (void)write(fd, kernel, strlen(kernel)); 121 (void)write(fd, "\"\n", 2); 122 close(fd); 123 } 124 } 125 126 /* Log the reboot. */ 127 if (!lflag) { 128 if ((user = getlogin()) == NULL) 129 user = (pw = getpwuid(getuid())) ? 130 pw->pw_name : "???"; 131 if (dohalt) { 132 openlog("halt", 0, LOG_AUTH | LOG_CONS); 133 syslog(LOG_CRIT, "halted by %s", user); 134 } else { 135 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 136 syslog(LOG_CRIT, "rebooted by %s", user); 137 } 138 } 139 logwtmp("~", "shutdown", ""); 140 141 /* 142 * Do a sync early on, so disks start transfers while we're off 143 * killing processes. Don't worry about writes done before the 144 * processes die, the reboot system call syncs the disks. 145 */ 146 if (!nflag) 147 sync(); 148 149 /* Just stop init -- if we fail, we'll restart it. */ 150 if (kill(1, SIGTSTP) == -1) 151 err(1, "SIGTSTP init"); 152 153 /* Ignore the SIGHUP we get when our parent shell dies. */ 154 (void)signal(SIGHUP, SIG_IGN); 155 156 /* Send a SIGTERM first, a chance to save the buffers. */ 157 if (kill(-1, SIGTERM) == -1) 158 err(1, "SIGTERM processes"); 159 160 /* 161 * After the processes receive the signal, start the rest of the 162 * buffers on their way. Wait 5 seconds between the SIGTERM and 163 * the SIGKILL to give everybody a chance. If there is a lot of 164 * paging activity then wait longer, up to a maximum of approx 165 * 60 seconds. 166 */ 167 sleep(2); 168 for (i = 0; i < 20; i++) { 169 pageins = get_pageins(); 170 if (!nflag) 171 sync(); 172 sleep(3); 173 if (get_pageins() == pageins) 174 break; 175 } 176 177 for (i = 1;; ++i) { 178 if (kill(-1, SIGKILL) == -1) { 179 if (errno == ESRCH) 180 break; 181 goto restart; 182 } 183 if (i > 5) { 184 (void)fprintf(stderr, 185 "WARNING: some process(es) wouldn't die\n"); 186 break; 187 } 188 (void)sleep(2 * i); 189 } 190 191 reboot(howto); 192 /* FALLTHROUGH */ 193 194 restart: 195 sverrno = errno; 196 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 197 strerror(sverrno)); 198 /* NOTREACHED */ 199 } 200 201 void 202 usage(void) 203 { 204 (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 205 dohalt ? "halt" : "reboot"); 206 exit(1); 207 } 208 209 u_int 210 get_pageins(void) 211 { 212 u_int pageins; 213 size_t len; 214 215 len = sizeof(pageins); 216 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 217 != 0) { 218 warnx("v_swappgsin"); 219 return (0); 220 } 221 return pageins; 222 } 223