sbin/reboot/reboot.c

   1 /*      $NetBSD: reboot.c,v 1.35 2008/02/09 04:27:06 dholland Exp $     */
   2
   3 /*
   4  * Copyright (c) 1980, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33
  34 #ifndef lint
  35 __COPYRIGHT("@(#) Copyright (c) 1980, 1986, 1993\
  36  The Regents of the University of California.  All rights reserved.");
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 #if 0
  41 static char sccsid[] = "@(#)reboot.c    8.1 (Berkeley) 6/5/93";
  42 #else
  43 __RCSID("$NetBSD: reboot.c,v 1.35 2008/02/09 04:27:06 dholland Exp $");
  44 #endif
  45 #endif /* not lint */
  46
  47 #include <sys/reboot.h>
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <pwd.h>
  52 #include <signal.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <syslog.h>
  57 #include <unistd.h>
  58 #include <util.h>
  59
  60 int main(int, char *[]);
  61 void usage(void);
  62
  63 int dohalt;
  64 int dopoweroff;
  65
  66 int
  67 main(int argc, char *argv[])
  68 {
  69         const char *progname;
  70         int i;
  71         struct passwd *pw;
  72         int ch, howto, lflag, nflag, qflag, sverrno, len;
  73         const char *user;
  74         char *bootstr, **av;
  75
  76         progname = getprogname();
  77         if (progname[0] == '-')
  78                 progname++;
  79         if (strcmp(progname, "halt") == 0) {
  80                 dohalt = 1;
  81                 howto = RB_HALT;
  82         } else if (strcmp(progname, "poweroff") == 0) {
  83                 dopoweroff = 1;
  84                 howto = RB_HALT | RB_POWERDOWN;
  85         } else
  86                 howto = 0;
  87         lflag = nflag = qflag = 0;
  88         while ((ch = getopt(argc, argv, "dlnpq")) != -1)
  89                 switch(ch) {
  90                 case 'd':
  91                         howto |= RB_DUMP;
  92                         break;
  93                 case 'l':
  94                         lflag = 1;
  95                         break;
  96                 case 'n':
  97                         nflag = 1;
  98                         howto |= RB_NOSYNC;
  99                         break;
 100                 case 'p':
 101                         if (dohalt == 0)
 102                                 usage();
 103                         howto |= RB_POWERDOWN;
 104                         break;
 105                 case 'q':
 106                         qflag = 1;
 107                         break;
 108                 case '?':
 109                 default:
 110                         usage();
 111                 }
 112         argc -= optind;
 113         argv += optind;
 114
 115         if (argc) {
 116                 for (av = argv, len = 0; *av; av++)
 117                         len += strlen(*av) + 1;
 118                 bootstr = malloc(len + 1);
 119                 *bootstr = '\0';                /* for first strcat */
 120                 for (av = argv; *av; av++) {
 121                         strcat(bootstr, *av);
 122                         strcat(bootstr, " ");
 123                 }
 124                 bootstr[len - 1] = '\0';        /* to kill last space */
 125                 howto |= RB_STRING;
 126         } else
 127                 bootstr = NULL;
 128
 129         if (geteuid())
 130                 errx(1, "%s", strerror(EPERM));
 131
 132         if (qflag) {
 133                 reboot(howto, bootstr);
 134                 err(1, "reboot");
 135         }
 136
 137         /* Log the reboot. */
 138         if (!lflag)  {
 139                 if ((user = getlogin()) == NULL)
 140                         user = (pw = getpwuid(getuid())) ?
 141                             pw->pw_name : "???";
 142                 if (dohalt) {
 143                         openlog("halt", LOG_CONS, LOG_AUTH);
 144                         syslog(LOG_CRIT, "halted by %s", user);
 145                 } else if (dopoweroff) {
 146                         openlog("poweroff", LOG_CONS, LOG_AUTH);
 147                         syslog(LOG_CRIT, "powered off by %s", user);
 148                 } else {
 149                         openlog("reboot", LOG_CONS, LOG_AUTH);
 150                         if (bootstr)
 151                                 syslog(LOG_CRIT, "rebooted by %s: %s", user,
 152                                     bootstr);
 153                         else
 154                                 syslog(LOG_CRIT, "rebooted by %s", user);
 155                 }
 156         }
 157 #ifdef SUPPORT_UTMP
 158         logwtmp("~", "shutdown", "");
 159 #endif
 160 #ifdef SUPPORT_UTMPX
 161         logwtmpx("~", "shutdown", "", INIT_PROCESS, 0);
 162 #endif
 163
 164         /*
 165          * Do a sync early on, so disks start transfers while we're off
 166          * killing processes.  Don't worry about writes done before the
 167          * processes die, the reboot system call syncs the disks.
 168          */
 169         if (!nflag)
 170                 sync();
 171
 172         /*
 173          * Ignore signals that we can get as a result of killing
 174          * parents, group leaders, etc.
 175          */
 176         (void)signal(SIGHUP,  SIG_IGN);
 177         (void)signal(SIGINT,  SIG_IGN);
 178         (void)signal(SIGQUIT, SIG_IGN);
 179         (void)signal(SIGTERM, SIG_IGN);
 180         (void)signal(SIGTSTP, SIG_IGN);
 181
 182         /*
 183          * If we're running in a pipeline, we don't want to die
 184          * after killing whatever we're writing to.
 185          */
 186         (void)signal(SIGPIPE, SIG_IGN);
 187
 188         /* Just stop init -- if we fail, we'll restart it. */
 189         if (kill(1, SIGTSTP) == -1)
 190                 err(1, "SIGTSTP init");
 191
 192         /* Send a SIGTERM first, a chance to save the buffers. */
 193         if (kill(-1, SIGTERM) == -1) {
 194                 /*
 195                  * If ESRCH, everything's OK: we're the only non-system
 196                  * process!  That can happen e.g. via 'exec reboot' in
 197                  * single-user mode.
 198                  */
 199                 if (errno != ESRCH) {
 200                         warn("SIGTERM all processes");
 201                         goto restart;
 202                 }
 203         }
 204
 205         /*
 206          * After the processes receive the signal, start the rest of the
 207          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 208          * the SIGKILL to pretend to give everybody a chance.
 209          */
 210         sleep(2);
 211         if (!nflag)
 212                 sync();
 213         sleep(3);
 214
 215         for (i = 1;; ++i) {
 216                 if (kill(-1, SIGKILL) == -1) {
 217                         if (errno == ESRCH)
 218                                 break;
 219                         warn("SIGKILL all processes");
 220                         goto restart;
 221                 }
 222                 if (i > 5) {
 223                         warnx("WARNING: some process(es) wouldn't die");
 224                         break;
 225                 }
 226                 (void)sleep(2 * i);
 227         }
 228
 229         reboot(howto, bootstr);
 230         warn("reboot()");
 231         /* FALLTHROUGH */
 232
 233 restart:
 234         sverrno = errno;
 235         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 236             strerror(sverrno));
 237         /* NOTREACHED */
 238 }
 239
 240 void
 241 usage(void)
 242 {
 243         const char *pflag = dohalt ? "p" : "";
 244
 245         (void)fprintf(stderr, "usage: %s [-dln%sq] [-- <boot string>]\n",
 246             getprogname(), pflag);
 247         exit(1);
 248 }