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