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 <TargetConditionals.h>
  62 #if !TARGET_OS_EMBEDDED
  63 #include "kextmanager.h"
  64 #include <IOKit/kext/kextmanager_types.h>
  65 #endif
  66 #include <mach/mach_port.h>             // allocate
  67 #include <mach/mach.h>                  // task_self, etc
  68 #include <servers/bootstrap.h>  // bootstrap
  69 #include <reboot2.h>
  70 #include <utmpx.h>
  71 #include <sys/time.h>
  72 #endif
  73
  74 void usage(void);
  75 u_int get_pageins(void);
  76 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
  77 int reserve_reboot(void);
  78 #endif
  79
  80 int dohalt;
  81
  82 int
  83 main(int argc, char *argv[])
  84 {
  85         struct passwd *pw;
  86         int ch, howto, kflag, lflag, nflag, qflag, uflag;
  87         char *p;
  88         const char *user;
  89 #ifndef __APPLE__
  90         int i, fd, pflag, sverrno;
  91         u_int pageins;
  92         char *kernel;
  93 #endif
  94
  95         if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
  96                 dohalt = 1;
  97                 howto = RB_HALT;
  98         } else
  99                 howto = 0;
 100         kflag = lflag = nflag = qflag = 0;
 101 #ifndef __APPLE__
 102         while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
 103 #else
 104         while ((ch = getopt(argc, argv, "lnqu")) != -1)
 105 #endif
 106                 switch(ch) {
 107 #ifndef __APPLE__
 108                 case 'd':
 109                         howto |= RB_DUMP;
 110                         break;
 111                 case 'k':
 112                         kflag = 1;
 113                         kernel = optarg;
 114                         break;
 115 #endif
 116                 case 'l':
 117                         lflag = 1;
 118                         break;
 119                 case 'n':
 120                         nflag = 1;
 121                         howto |= RB_NOSYNC;
 122                         break;
 123 /* -p is irrelevant on OS X.  It does that anyway. */
 124 #ifndef __APPLE__
 125                 case 'p':
 126                         pflag = 1;
 127                         howto |= RB_POWEROFF;
 128                         break;
 129 #endif
 130                 case 'u':
 131                         uflag = 1;
 132                         howto |= RB_UPSDELAY;
 133                         break;
 134                 case 'q':
 135                         qflag = 1;
 136                         howto |= RB_QUICK;
 137                         break;
 138                 case '?':
 139                 default:
 140                         usage();
 141                 }
 142         argc -= optind;
 143         argv += optind;
 144
 145 #ifndef __APPLE__
 146         if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 147                 errx(1, "cannot dump (-d) when halting; must reboot instead");
 148 #endif
 149         if (geteuid()) {
 150                 errno = EPERM;
 151                 err(1, NULL);
 152         }
 153
 154 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
 155         if (!qflag && !lflag) { // shutdown(8) has already checked w/kextd
 156                 if ((errno = reserve_reboot()))
 157                         err(1, "couldn't lock for reboot");
 158         }
 159 #endif
 160
 161         if (qflag) {
 162                 reboot(howto);
 163                 err(1, NULL);
 164         }
 165
 166 #ifndef __APPLE__
 167         if (kflag) {
 168                 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
 169                 if (fd > -1) {
 170                         (void)write(fd, "nextboot_enable=\"YES\"\n", 22);
 171                         (void)write(fd, "kernel=\"", 8L);
 172                         (void)write(fd, kernel, strlen(kernel));
 173                         (void)write(fd, "\"\n", 2);
 174                         close(fd);
 175                 }
 176         }
 177 #endif
 178
 179         /* Log the reboot. */
 180         if (!lflag)  {
 181                 if ((user = getlogin()) == NULL)
 182                         user = (pw = getpwuid(getuid())) ?
 183                             pw->pw_name : "???";
 184                 if (dohalt) {
 185                         openlog("halt", 0, LOG_AUTH | LOG_CONS);
 186                         syslog(LOG_CRIT, "halted by %s%s", user,
 187                              (howto & RB_UPSDELAY) ? " with UPS delay":"");
 188                 } else {
 189                         openlog("reboot", 0, LOG_AUTH | LOG_CONS);
 190                         syslog(LOG_CRIT, "rebooted by %s", user);
 191                 }
 192         }
 193 #if defined(__APPLE__)
 194         {
 195                 struct utmpx utx;
 196                 bzero(&utx, sizeof(utx));
 197                 utx.ut_type = BOOT_TIME;
 198                 gettimeofday(&utx.ut_tv, NULL);
 199                 pututxline(&utx);
 200
 201                 int newvalue = 1;
 202                 sysctlbyname("kern.willshutdown", NULL, NULL, &newvalue, sizeof(newvalue));
 203         }
 204 #else
 205         logwtmp("~", "shutdown", "");
 206 #endif
 207
 208         /*
 209          * Do a sync early on, so disks start transfers while we're off
 210          * killing processes.  Don't worry about writes done before the
 211          * processes die, the reboot system call syncs the disks.
 212          */
 213         if (!nflag)
 214                 sync();
 215
 216 #ifndef __APPLE__
 217         /* Just stop init -- if we fail, we'll restart it. */
 218         if (kill(1, SIGTSTP) == -1)
 219                 err(1, "SIGTSTP init");
 220 #endif
 221
 222         /* Ignore the SIGHUP we get when our parent shell dies. */
 223         (void)signal(SIGHUP, SIG_IGN);
 224
 225 #ifndef __APPLE__
 226         /* Send a SIGTERM first, a chance to save the buffers. */
 227         if (kill(-1, SIGTERM) == -1)
 228                 err(1, "SIGTERM processes");
 229
 230         /*
 231          * After the processes receive the signal, start the rest of the
 232          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 233          * the SIGKILL to give everybody a chance. If there is a lot of
 234          * paging activity then wait longer, up to a maximum of approx
 235          * 60 seconds.
 236          */
 237         sleep(2);
 238         for (i = 0; i < 20; i++) {
 239                 pageins = get_pageins();
 240                 if (!nflag)
 241                         sync();
 242                 sleep(3);
 243                 if (get_pageins() == pageins)
 244                         break;
 245         }
 246
 247         for (i = 1;; ++i) {
 248                 if (kill(-1, SIGKILL) == -1) {
 249                         if (errno == ESRCH)
 250                                 break;
 251                         goto restart;
 252                 }
 253                 if (i > 5) {
 254                         (void)fprintf(stderr,
 255                             "WARNING: some process(es) wouldn't die\n");
 256                         break;
 257                 }
 258                 (void)sleep(2 * i);
 259         }
 260 #endif
 261
 262 #ifdef __APPLE__
 263         // launchd(8) handles reboot.  This call returns NULL on success.
 264         exit(reboot2(howto) == NULL ? EXIT_SUCCESS : EXIT_FAILURE);
 265 #else /* __APPLE__ */
 266         reboot(howto);
 267         /* FALLTHROUGH */
 268
 269 restart:
 270         sverrno = errno;
 271         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 272             strerror(sverrno));
 273         /* NOTREACHED */
 274 #endif /* __APPLE__ */
 275 }
 276
 277 void
 278 usage()
 279 {
 280 #ifndef __APPLE__
 281         (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
 282 #else
 283         (void)fprintf(stderr, "usage: %s [-lnq]\n",
 284 #endif
 285             dohalt ? "halt" : "reboot");
 286         exit(1);
 287 }
 288
 289 u_int
 290 get_pageins()
 291 {
 292         u_int pageins;
 293         size_t len;
 294
 295         len = sizeof(pageins);
 296         if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
 297             != 0) {
 298                 warnx("v_swappgsin");
 299                 return (0);
 300         }
 301         return pageins;
 302 }
 303
 304 #if defined(__APPLE__) && !TARGET_OS_EMBEDDED
 305 // XX this routine is also in shutdown.tproj; it would be nice to share
 306
 307 #define WAITFORLOCK 1
 308 /*
 309  * contact kextd to lock for reboot
 310  */
 311 int
 312 reserve_reboot()
 313 {
 314         int rval = ELAST + 1;
 315         kern_return_t macherr = KERN_FAILURE;
 316         mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 317         int busyStatus = ELAST + 1;
 318         mountpoint_t busyVol;
 319
 320         macherr = bootstrap_look_up(bootstrap_port, KEXTD_SERVER_NAME, &kxport);
 321         if (macherr)  goto finish;
 322
 323         // allocate a port to pass to kextd (in case we die)
 324         tport = mach_task_self();
 325         if (tport == MACH_PORT_NULL)  goto finish;
 326         macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 327         if (macherr)  goto finish;
 328
 329         // try to lock for reboot
 330         macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 331                                       &busyStatus);
 332         if (macherr)  goto finish;
 333
 334         if (busyStatus == EBUSY) {
 335                 warnx("%s is busy updating; waiting for lock", busyVol);
 336                 macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 337                                                                                   busyVol, &busyStatus);
 338                 if (macherr)    goto finish;
 339         }
 340
 341         if (busyStatus == EALREADY) {
 342                 // reboot already in progress
 343                 rval = 0;
 344         } else {
 345                 rval = busyStatus;
 346         }
 347
 348 finish:
 349         // in general, we want to err on the side of allowing the reboot
 350         if (macherr) {
 351                 if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 352                         warnx("WARNING: couldn't lock kext manager for reboot: %s",
 353                                         mach_error_string(macherr));
 354                 rval = 0;
 355         }
 356         // unless we got the lock, clean up our port
 357         if (busyStatus != 0 && myport != MACH_PORT_NULL)
 358                 mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 359
 360         return rval;
 361 }
 362 #endif