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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1986, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/reboot.h> 49 #include <sys/types.h> 50 #include <sys/sysctl.h> 51 #include <signal.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <libutil.h> 56 #include <pwd.h> 57 #include <syslog.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 void usage(void); 64 u_int get_pageins(void); 65 66 int dohalt; 67 68 int 69 main(int argc, char *argv[]) 70 { 71 struct passwd *pw; 72 int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno; 73 u_int pageins; 74 char *kernel, *p; 75 const char *user; 76 77 if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) { 78 dohalt = 1; 79 howto = RB_HALT; 80 } else 81 howto = 0; 82 kflag = lflag = nflag = qflag = 0; 83 while ((ch = getopt(argc, argv, "dk:lnpq")) != -1) 84 switch(ch) { 85 case 'd': 86 howto |= RB_DUMP; 87 break; 88 case 'k': 89 kflag = 1; 90 kernel = optarg; 91 break; 92 case 'l': 93 lflag = 1; 94 break; 95 case 'n': 96 nflag = 1; 97 howto |= RB_NOSYNC; 98 break; 99 case 'p': 100 pflag = 1; 101 howto |= RB_POWEROFF; 102 break; 103 case 'q': 104 qflag = 1; 105 break; 106 case '?': 107 default: 108 usage(); 109 } 110 argc -= optind; 111 argv += optind; 112 113 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT)) 114 errx(1, "cannot dump (-d) when halting; must reboot instead"); 115 if (geteuid()) { 116 errno = EPERM; 117 err(1, NULL); 118 } 119 120 if (qflag) { 121 reboot(howto); 122 err(1, NULL); 123 } 124 125 if (kflag) { 126 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444); 127 if (fd > -1) { 128 (void)write(fd, "nextboot_enable=\"YES\"\n", 22); 129 (void)write(fd, "kernel=\"", 8L); 130 (void)write(fd, kernel, strlen(kernel)); 131 (void)write(fd, "\"\n", 2); 132 close(fd); 133 } 134 } 135 136 /* Log the reboot. */ 137 if (!lflag) { 138 if ((user = getlogin()) == NULL) 139 user = (pw = getpwuid(getuid())) ? 140 pw->pw_name : "???"; 141 if (dohalt) { 142 openlog("halt", 0, LOG_AUTH | LOG_CONS); 143 syslog(LOG_CRIT, "halted by %s", user); 144 } else { 145 openlog("reboot", 0, LOG_AUTH | LOG_CONS); 146 syslog(LOG_CRIT, "rebooted by %s", user); 147 } 148 } 149 logwtmp("~", "shutdown", ""); 150 151 /* 152 * Do a sync early on, so disks start transfers while we're off 153 * killing processes. Don't worry about writes done before the 154 * processes die, the reboot system call syncs the disks. 155 */ 156 if (!nflag) 157 sync(); 158 159 /* Just stop init -- if we fail, we'll restart it. */ 160 if (kill(1, SIGTSTP) == -1) 161 err(1, "SIGTSTP init"); 162 163 /* Ignore the SIGHUP we get when our parent shell dies. */ 164 (void)signal(SIGHUP, SIG_IGN); 165 166 /* Send a SIGTERM first, a chance to save the buffers. */ 167 if (kill(-1, SIGTERM) == -1) 168 err(1, "SIGTERM processes"); 169 170 /* 171 * After the processes receive the signal, start the rest of the 172 * buffers on their way. Wait 5 seconds between the SIGTERM and 173 * the SIGKILL to give everybody a chance. If there is a lot of 174 * paging activity then wait longer, up to a maximum of approx 175 * 60 seconds. 176 */ 177 sleep(2); 178 for (i = 0; i < 20; i++) { 179 pageins = get_pageins(); 180 if (!nflag) 181 sync(); 182 sleep(3); 183 if (get_pageins() == pageins) 184 break; 185 } 186 187 for (i = 1;; ++i) { 188 if (kill(-1, SIGKILL) == -1) { 189 if (errno == ESRCH) 190 break; 191 goto restart; 192 } 193 if (i > 5) { 194 (void)fprintf(stderr, 195 "WARNING: some process(es) wouldn't die\n"); 196 break; 197 } 198 (void)sleep(2 * i); 199 } 200 201 reboot(howto); 202 /* FALLTHROUGH */ 203 204 restart: 205 sverrno = errno; 206 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "", 207 strerror(sverrno)); 208 /* NOTREACHED */ 209 } 210 211 void 212 usage() 213 { 214 (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n", 215 dohalt ? "halt" : "reboot"); 216 exit(1); 217 } 218 219 u_int 220 get_pageins() 221 { 222 u_int pageins; 223 size_t len; 224 225 len = sizeof(pageins); 226 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0) 227 != 0) { 228 warnx("v_swappgsin"); 229 return (0); 230 } 231 return pageins; 232 } 233