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