reboot.tproj/reboot.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Portions copyright (c) 2007 Apple Inc.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #ifndef lint
  32 static const char copyright[] =
  33 "@(#) Copyright (c) 1980, 1986, 1993\n\
  34         The Regents of the University of California.  All rights reserved.\n";
  35 #endif /* not lint */
  36
  37 #ifndef lint
  38 #if 0
  39 static char sccsid[] = "@(#)reboot.c    8.1 (Berkeley) 6/5/93";
  40 #endif
  41 static const char rcsid[] =
  42   "$FreeBSD: src/sbin/reboot/reboot.c,v 1.17 2002/10/06 16:24:36 thomas Exp $";
  43 #endif /* not lint */
  44
  45 #include <sys/reboot.h>
  46 #include <sys/types.h>
  47 #include <sys/sysctl.h>
  48 #include <signal.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <util.h>
  53 #include <pwd.h>
  54 #include <syslog.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 #ifdef __APPLE__
  61 #include "kextmanager.h"
  62 #include <IOKit/kext/kextmanager_types.h>
  63 #include <mach/mach_port.h>             // allocate
  64 #include <mach/mach.h>                  // task_self, etc
  65 #include <servers/bootstrap.h>  // bootstrap
  66 #include <reboot2.h>
  67 #endif
  68
  69 void usage(void);
  70 u_int get_pageins(void);
  71 #ifdef __APPLE__
  72 int reserve_reboot(void);
  73 #endif
  74
  75 int dohalt;
  76
  77 int
  78 main(int argc, char *argv[])
  79 {
  80         struct passwd *pw;
  81         int ch, howto, kflag, lflag, nflag, qflag, uflag;
  82         char *p;
  83         const char *user;
  84 #ifndef __APPLE__
  85         int i, fd, pflag, sverrno;
  86         u_int pageins;
  87         char *kernel;
  88 #endif
  89
  90         if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
  91                 dohalt = 1;
  92                 howto = RB_HALT;
  93         } else
  94                 howto = 0;
  95         kflag = lflag = nflag = qflag = 0;
  96 #ifndef __APPLE__
  97         while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
  98 #else
  99         while ((ch = getopt(argc, argv, "lnqu")) != -1)
 100 #endif
 101                 switch(ch) {
 102 #ifndef __APPLE__
 103                 case 'd':
 104                         howto |= RB_DUMP;
 105                         break;
 106                 case 'k':
 107                         kflag = 1;
 108                         kernel = optarg;
 109                         break;
 110 #endif
 111                 case 'l':
 112                         lflag = 1;
 113                         break;
 114                 case 'n':
 115                         nflag = 1;
 116                         howto |= RB_NOSYNC;
 117                         break;
 118 /* -p is irrelevant on OS X.  It does that anyway. */
 119 #ifndef __APPLE__
 120                 case 'p':
 121                         pflag = 1;
 122                         howto |= RB_POWEROFF;
 123                         break;
 124 #endif
 125                 case 'u':
 126                         uflag = 1;
 127                         howto |= RB_UPSDELAY;
 128                         break;
 129                 case 'q':
 130                         qflag = 1;
 131                         break;
 132                 case '?':
 133                 default:
 134                         usage();
 135                 }
 136         argc -= optind;
 137         argv += optind;
 138
 139 #ifndef __APPLE__
 140         if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 141                 errx(1, "cannot dump (-d) when halting; must reboot instead");
 142 #endif
 143         if (geteuid()) {
 144                 errno = EPERM;
 145                 err(1, NULL);
 146         }
 147
 148 #ifdef __APPLE__
 149         if (!lflag) {   // shutdown(8) has already checked w/kextd
 150                 if ((errno = reserve_reboot()) && !qflag)
 151                         err(1, "couldn't lock for reboot");
 152         }
 153 #endif
 154
 155         if (qflag) {
 156                 reboot(howto);
 157                 err(1, NULL);
 158         }
 159
 160 #ifndef __APPLE__
 161         if (kflag) {
 162                 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
 163                 if (fd > -1) {
 164                         (void)write(fd, "nextboot_enable=\"YES\"\n", 22);
 165                         (void)write(fd, "kernel=\"", 8L);
 166                         (void)write(fd, kernel, strlen(kernel));
 167                         (void)write(fd, "\"\n", 2);
 168                         close(fd);
 169                 }
 170         }
 171 #endif
 172
 173         /* Log the reboot. */
 174         if (!lflag)  {
 175                 if ((user = getlogin()) == NULL)
 176                         user = (pw = getpwuid(getuid())) ?
 177                             pw->pw_name : "???";
 178                 if (dohalt) {
 179                         openlog("halt", 0, LOG_AUTH | LOG_CONS);
 180                         syslog(LOG_CRIT, "halted by %s%s", user,
 181                              (howto & RB_UPSDELAY) ? " with UPS delay":"");
 182                 } else {
 183                         openlog("reboot", 0, LOG_AUTH | LOG_CONS);
 184                         syslog(LOG_CRIT, "rebooted by %s", user);
 185                 }
 186         }
 187         logwtmp("~", "shutdown", "");
 188
 189         /*
 190          * Do a sync early on, so disks start transfers while we're off
 191          * killing processes.  Don't worry about writes done before the
 192          * processes die, the reboot system call syncs the disks.
 193          */
 194         if (!nflag)
 195                 sync();
 196
 197 #ifndef __APPLE__
 198         /* Just stop init -- if we fail, we'll restart it. */
 199         if (kill(1, SIGTSTP) == -1)
 200                 err(1, "SIGTSTP init");
 201 #endif
 202
 203         /* Ignore the SIGHUP we get when our parent shell dies. */
 204         (void)signal(SIGHUP, SIG_IGN);
 205
 206 #ifndef __APPLE__
 207         /* Send a SIGTERM first, a chance to save the buffers. */
 208         if (kill(-1, SIGTERM) == -1)
 209                 err(1, "SIGTERM processes");
 210
 211         /*
 212          * After the processes receive the signal, start the rest of the
 213          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 214          * the SIGKILL to give everybody a chance. If there is a lot of
 215          * paging activity then wait longer, up to a maximum of approx
 216          * 60 seconds.
 217          */
 218         sleep(2);
 219         for (i = 0; i < 20; i++) {
 220                 pageins = get_pageins();
 221                 if (!nflag)
 222                         sync();
 223                 sleep(3);
 224                 if (get_pageins() == pageins)
 225                         break;
 226         }
 227
 228         for (i = 1;; ++i) {
 229                 if (kill(-1, SIGKILL) == -1) {
 230                         if (errno == ESRCH)
 231                                 break;
 232                         goto restart;
 233                 }
 234                 if (i > 5) {
 235                         (void)fprintf(stderr,
 236                             "WARNING: some process(es) wouldn't die\n");
 237                         break;
 238                 }
 239                 (void)sleep(2 * i);
 240         }
 241 #endif
 242
 243 #ifdef __APPLE__
 244         // launchd(8) handles reboot.  This call returns NULL on success.
 245         exit(reboot2(howto) == NULL ? EXIT_SUCCESS : EXIT_FAILURE);
 246 #else /* __APPLE__ */
 247         reboot(howto);
 248         /* FALLTHROUGH */
 249
 250 restart:
 251         sverrno = errno;
 252         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 253             strerror(sverrno));
 254         /* NOTREACHED */
 255 #endif /* __APPLE__ */
 256 }
 257
 258 void
 259 usage()
 260 {
 261 #ifndef __APPLE__
 262         (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
 263 #else
 264         (void)fprintf(stderr, "usage: %s [-lnq]\n",
 265 #endif
 266             dohalt ? "halt" : "reboot");
 267         exit(1);
 268 }
 269
 270 u_int
 271 get_pageins()
 272 {
 273         u_int pageins;
 274         size_t len;
 275
 276         len = sizeof(pageins);
 277         if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
 278             != 0) {
 279                 warnx("v_swappgsin");
 280                 return (0);
 281         }
 282         return pageins;
 283 }
 284
 285 #ifdef __APPLE__
 286 // XX this routine is also in shutdown.tproj; it would be nice to share
 287
 288 #define WAITFORLOCK 1
 289 /*
 290  * contact kextd to lock for reboot
 291  */
 292 int
 293 reserve_reboot()
 294 {
 295         int rval = ELAST + 1;
 296         kern_return_t macherr = KERN_FAILURE;
 297         mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 298         int busyStatus = ELAST + 1;
 299         mountpoint_t busyVol;
 300
 301         macherr = bootstrap_look_up(bootstrap_port, KEXTD_SERVER_NAME, &kxport);
 302         if (macherr)  goto finish;
 303
 304         // allocate a port to pass to kextd (in case we die)
 305         tport = mach_task_self();
 306         if (tport == MACH_PORT_NULL)  goto finish;
 307         macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 308         if (macherr)  goto finish;
 309
 310         // try to lock for reboot
 311         macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 312                                       &busyStatus);
 313         if (macherr)  goto finish;
 314
 315         if (busyStatus == EBUSY) {
 316                 warnx("%s is busy updating; waiting for lock", busyVol);
 317                 macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 318                                                                                   busyVol, &busyStatus);
 319                 if (macherr)    goto finish;
 320         }
 321
 322         if (busyStatus == EALREADY) {
 323                 // reboot already in progress
 324                 rval = 0;
 325         } else {
 326                 rval = busyStatus;
 327         }
 328
 329 finish:
 330         // in general, we want to err on the side of allowing the reboot
 331         if (macherr) {
 332                 if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 333                         warnx("WARNING: couldn't lock kext manager for reboot: %s",
 334                                         mach_error_string(macherr));
 335                 rval = 0;
 336         }
 337         // unless we got the lock, clean up our port
 338         if (busyStatus != 0 && myport != MACH_PORT_NULL)
 339                 mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 340
 341         return rval;
 342 }
 343 #endif