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 49 void usage(void) __dead2; 50 u_int get_pageins(void); 51 52 int dohalt; 53 54 int 55 main(int argc, char *argv[]) 56 { 57 struct passwd *pw; 58 int ch, howto, i, fd, kflag, lflag, nflag, qflag, sverrno; 59 u_int pageins; 60 char *kernel = NULL, *p; 61 const char *user; 62 63 if (strstr((p = strrchr(*argv, '/')) ? p + 1 : *argv, "halt")) { 64 dohalt = 1; 65 howto = RB_HALT; 66 } else 67 howto = 0; 68 kflag = lflag = nflag = qflag = 0; 69 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 70 switch(ch) { 71 case 'd': 72 howto |= RB_DUMP; 73 break; 74 case 'k': 75 kflag = 1; 76 kernel = optarg; 77 break; 78 case 'l': 79 lflag = 1; 80 break; 81 case 'n': 82 nflag = 1; 83 howto |= RB_NOSYNC; 84 break; 85 case 'p': 86 howto |= (RB_POWEROFF | RB_HALT); 87 break; 88 case 'q': 89 qflag = 1; 90 break; 91 case '?': 92 default: 93 usage(); 94 } 95 argc -= optind; 96 argv += optind; 97 98 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 99 errx(1, "cannot dump (-d) when halting; must reboot instead"); 100 if (geteuid()) { 101 errno = EPERM; 102 err(1, NULL); 103 } 104 105 if (qflag) { 106 reboot(howto); 107 err(1, NULL); 108 } 109 110 if (kflag) { 111 fd = open("/boot/nextboot.conf", 112 O_WRONLY | O_CREAT | O_TRUNC, 0444); 113 if (fd != -1) { 114 write(fd, "kernel=\"", 8L); 115 write(fd, kernel, strlen(kernel)); 116 write(fd, "\"\n", 2); 117 close(fd); 118 } 119 } 120 121 /* Log the reboot. */ 122 if (!lflag) { 123 if ((user = getlogin()) == NULL) 124 user = (pw = getpwuid(getuid())) ? 125 pw->pw_name : "???"; 126 if (dohalt) { 127 openlog("halt", 0, LOG_AUTH | LOG_CONS); 128 syslog(LOG_CRIT, "halted by %s", user); 129 } else { 130 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 131 syslog(LOG_CRIT, "rebooted by %s", user); 132 } 133 } 134 logwtmp("~", "shutdown", ""); 135 136 /* 137 * Do a sync early on, so disks start transfers while we're off 138 * killing processes. Don't worry about writes done before the 139 * processes die, the reboot system call syncs the disks. 140 */ 141 if (!nflag) 142 sync(); 143 144 /* Just stop init -- if we fail, we'll restart it. */ 145 if (kill(1, SIGTSTP) == -1) 146 err(1, "SIGTSTP init"); 147 148 /* Ignore the SIGHUP we get when our parent shell dies. */ 149 signal(SIGHUP, SIG_IGN); 150 /* parent shell might also send a SIGTERM? Best to ignore as well */ 151 signal(SIGTERM, SIG_IGN); 152 153 /* Send a SIGTERM first, a chance to save the buffers. */ 154 if (kill(-1, SIGTERM) == -1) 155 err(1, "SIGTERM processes"); 156 157 /* 158 * After the processes receive the signal, start the rest of the 159 * buffers on their way. Wait 5 seconds between the SIGTERM and 160 * the SIGKILL to give everybody a chance. If there is a lot of 161 * paging activity then wait longer, up to a maximum of approx 162 * 60 seconds. 163 */ 164 sleep(2); 165 for (i = 0; i < 20; i++) { 166 pageins = get_pageins(); 167 if (!nflag) 168 sync(); 169 sleep(3); 170 if (get_pageins() == pageins) 171 break; 172 } 173 174 for (i = 1;; ++i) { 175 if (kill(-1, SIGKILL) == -1) { 176 if (errno == ESRCH) 177 break; 178 goto restart; 179 } 180 if (i > 5) { 181 fprintf(stderr, 182 "WARNING: some process(es) wouldn't die\n"); 183 break; 184 } 185 sleep(2 * i); 186 } 187 188 reboot(howto); 189 /* FALLTHROUGH */ 190 191 restart: 192 sverrno = errno; 193 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 194 strerror(sverrno)); 195 /* NOTREACHED */ 196 } 197 198 void 199 usage(void) 200 { 201 fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 202 dohalt ? "halt" : "reboot"); 203 exit(1); 204 } 205 206 u_int 207 get_pageins(void) 208 { 209 u_int pageins; 210 size_t len; 211 212 len = sizeof(pageins); 213 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 214 != 0) { 215 warnx("v_swappgsin"); 216 return (0); 217 } 218 return pageins; 219 } 220