system_cmds/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 #include <sys/cdefs.h>
  32
  33 #ifndef lint
  34 __unused static const char copyright[] =
  35 "@(#) Copyright (c) 1980, 1986, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 #if 0
  41 static char sccsid[] = "@(#)reboot.c    8.1 (Berkeley) 6/5/93";
  42 #endif
  43 __unused static const char rcsid[] =
  44   "$FreeBSD: src/sbin/reboot/reboot.c,v 1.17 2002/10/06 16:24:36 thomas Exp $";
  45 #endif /* not lint */
  46
  47 #include <sys/reboot.h>
  48 #include <sys/types.h>
  49 #include <sys/sysctl.h>
  50 #include <signal.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fcntl.h>
  54 #include <util.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 #ifdef __APPLE__
  63 #include <TargetConditionals.h>
  64 #if !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
  65 #include "kextmanager.h"
  66 #include <IOKit/kext/kextmanager_types.h>
  67 #endif
  68 #include <mach/mach_port.h>             // allocate
  69 #include <mach/mach.h>                  // task_self, etc
  70 #include <servers/bootstrap.h>  // bootstrap
  71 #include <bootstrap_priv.h>
  72 #include <reboot2.h>
  73 #include <utmpx.h>
  74 #include <sys/time.h>
  75 #endif
  76
  77 int     reboot3(int);
  78
  79 void usage(void);
  80 u_int get_pageins(void);
  81 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
  82 int reserve_reboot(void);
  83 #endif
  84
  85 int dohalt;
  86
  87 int
  88 main(int argc, char *argv[])
  89 {
  90         struct passwd *pw;
  91         int ch, howto, kflag, lflag, nflag, qflag, uflag;
  92         char *p;
  93         const char *user;
  94 #ifndef __APPLE__
  95         int i, fd, pflag, sverrno;
  96         u_int pageins;
  97         char *kernel;
  98 #endif
  99
 100         if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
 101                 dohalt = 1;
 102                 howto = RB_HALT;
 103         } else
 104                 howto = 0;
 105         kflag = lflag = nflag = qflag = 0;
 106 #ifndef __APPLE__
 107         while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
 108 #else
 109         while ((ch = getopt(argc, argv, "lnqu")) != -1)
 110 #endif
 111                 switch(ch) {
 112 #ifndef __APPLE__
 113                 case 'd':
 114                         howto |= RB_DUMP;
 115                         break;
 116                 case 'k':
 117                         kflag = 1;
 118                         kernel = optarg;
 119                         break;
 120 #endif
 121                 case 'l':
 122                         lflag = 1;
 123                         break;
 124                 case 'n':
 125                         nflag = 1;
 126                         howto |= RB_NOSYNC;
 127                         break;
 128 /* -p is irrelevant on OS X.  It does that anyway. */
 129 #ifndef __APPLE__
 130                 case 'p':
 131                         pflag = 1;
 132                         howto |= RB_POWEROFF;
 133                         break;
 134 #endif
 135                 case 'u':
 136                         uflag = 1;
 137                         howto |= RB_UPSDELAY;
 138                         break;
 139                 case 'q':
 140                         qflag = 1;
 141                         howto |= RB_QUICK;
 142                         break;
 143                 case '?':
 144                 default:
 145                         usage();
 146                 }
 147         argc -= optind;
 148         argv += optind;
 149
 150 #ifndef __APPLE__
 151         if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
 152                 errx(1, "cannot dump (-d) when halting; must reboot instead");
 153 #endif
 154         if (geteuid()) {
 155                 errno = EPERM;
 156                 err(1, NULL);
 157         }
 158
 159 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
 160         if (!qflag && !lflag) { // shutdown(8) has already checked w/kextd
 161                 if ((errno = reserve_reboot()))
 162                         err(1, "couldn't lock for reboot");
 163         }
 164 #endif
 165
 166         if (qflag) {
 167                 reboot(howto);
 168                 err(1, NULL);
 169         }
 170
 171 #ifndef __APPLE__
 172         if (kflag) {
 173                 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT, 0444);
 174                 if (fd > -1) {
 175                         (void)write(fd, "nextboot_enable=\"YES\"\n", 22);
 176                         (void)write(fd, "kernel=\"", 8L);
 177                         (void)write(fd, kernel, strlen(kernel));
 178                         (void)write(fd, "\"\n", 2);
 179                         close(fd);
 180                 }
 181         }
 182 #endif
 183
 184         /* Log the reboot. */
 185         if (!lflag)  {
 186                 if ((user = getlogin()) == NULL)
 187                         user = (pw = getpwuid(getuid())) ?
 188                             pw->pw_name : "???";
 189                 if (dohalt) {
 190                         openlog("halt", 0, LOG_AUTH | LOG_CONS);
 191                         syslog(LOG_CRIT, "halted by %s%s", user,
 192                              (howto & RB_UPSDELAY) ? " with UPS delay":"");
 193                 } else {
 194                         openlog("reboot", 0, LOG_AUTH | LOG_CONS);
 195                         syslog(LOG_CRIT, "rebooted by %s", user);
 196                 }
 197         }
 198 #if defined(__APPLE__)
 199         {
 200                 struct utmpx utx;
 201                 bzero(&utx, sizeof(utx));
 202                 utx.ut_type = SHUTDOWN_TIME;
 203                 gettimeofday(&utx.ut_tv, NULL);
 204                 pututxline(&utx);
 205         }
 206 #else
 207         logwtmp("~", "shutdown", "");
 208 #endif
 209
 210         /*
 211          * Do a sync early on, so disks start transfers while we're off
 212          * killing processes.  Don't worry about writes done before the
 213          * processes die, the reboot system call syncs the disks.
 214          */
 215         if (!nflag)
 216                 sync();
 217
 218 #ifndef __APPLE__
 219         /* Just stop init -- if we fail, we'll restart it. */
 220         if (kill(1, SIGTSTP) == -1)
 221                 err(1, "SIGTSTP init");
 222 #endif
 223
 224         /* Ignore the SIGHUP we get when our parent shell dies. */
 225         (void)signal(SIGHUP, SIG_IGN);
 226
 227 #ifndef __APPLE__
 228         /* Send a SIGTERM first, a chance to save the buffers. */
 229         if (kill(-1, SIGTERM) == -1)
 230                 err(1, "SIGTERM processes");
 231
 232         /*
 233          * After the processes receive the signal, start the rest of the
 234          * buffers on their way.  Wait 5 seconds between the SIGTERM and
 235          * the SIGKILL to give everybody a chance. If there is a lot of
 236          * paging activity then wait longer, up to a maximum of approx
 237          * 60 seconds.
 238          */
 239         sleep(2);
 240         for (i = 0; i < 20; i++) {
 241                 pageins = get_pageins();
 242                 if (!nflag)
 243                         sync();
 244                 sleep(3);
 245                 if (get_pageins() == pageins)
 246                         break;
 247         }
 248
 249         for (i = 1;; ++i) {
 250                 if (kill(-1, SIGKILL) == -1) {
 251                         if (errno == ESRCH)
 252                                 break;
 253                         goto restart;
 254                 }
 255                 if (i > 5) {
 256                         (void)fprintf(stderr,
 257                             "WARNING: some process(es) wouldn't die\n");
 258                         break;
 259                 }
 260                 (void)sleep(2 * i);
 261         }
 262 #endif
 263
 264 #ifdef __APPLE__
 265         // launchd(8) handles reboot.  This call returns NULL on success.
 266         exit(reboot3(howto) == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
 267 #else /* __APPLE__ */
 268         reboot(howto);
 269         /* FALLTHROUGH */
 270
 271 restart:
 272         sverrno = errno;
 273         errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
 274             strerror(sverrno));
 275         /* NOTREACHED */
 276 #endif /* __APPLE__ */
 277 }
 278
 279 void
 280 usage(void)
 281 {
 282 #ifndef __APPLE__
 283         (void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
 284 #else
 285         (void)fprintf(stderr, "usage: %s [-lnq]\n",
 286 #endif
 287             dohalt ? "halt" : "reboot");
 288         exit(1);
 289 }
 290
 291 u_int
 292 get_pageins(void)
 293 {
 294         u_int pageins;
 295         size_t len;
 296
 297         len = sizeof(pageins);
 298         if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
 299             != 0) {
 300                 warnx("v_swappgsin");
 301                 return (0);
 302         }
 303         return pageins;
 304 }
 305
 306 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
 307 // XX this routine is also in shutdown.tproj; it would be nice to share
 308
 309 static bool
 310 kextdDisabled(void)
 311 {
 312         uint32_t disabled = 0;
 313         size_t   sizeOfDisabled = sizeof(disabled);
 314         if (sysctlbyname("hw.use_kernelmanagerd", &disabled, &sizeOfDisabled, NULL, 0) != 0) {
 315                 return false;
 316         }
 317         return (disabled != 0);
 318 }
 319
 320 #define WAITFORLOCK 1
 321 /*
 322  * contact kextd to lock for reboot
 323  */
 324 int
 325 reserve_reboot(void)
 326 {
 327         int rval = ELAST + 1;
 328         kern_return_t macherr = KERN_FAILURE;
 329         mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 330         int busyStatus = ELAST + 1;
 331         mountpoint_t busyVol;
 332
 333         if (kextdDisabled()) {
 334                 /* no need to talk with kextd if it's not running */
 335                 return 0;
 336         }
 337
 338         macherr = bootstrap_look_up2(bootstrap_port, KEXTD_SERVER_NAME, &kxport, 0, BOOTSTRAP_PRIVILEGED_SERVER);
 339         if (macherr)  goto finish;
 340
 341         // allocate a port to pass to kextd (in case we die)
 342         tport = mach_task_self();
 343         if (tport == MACH_PORT_NULL)  goto finish;
 344         macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 345         if (macherr)  goto finish;
 346
 347         // try to lock for reboot
 348         macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 349                                       &busyStatus);
 350         if (macherr)  goto finish;
 351
 352         if (busyStatus == EBUSY) {
 353                 warnx("%s is busy updating; waiting for lock", busyVol);
 354                 macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 355                                                                                   busyVol, &busyStatus);
 356                 if (macherr)    goto finish;
 357         }
 358
 359         if (busyStatus == EALREADY) {
 360                 // reboot already in progress
 361                 rval = 0;
 362         } else {
 363                 rval = busyStatus;
 364         }
 365
 366 finish:
 367         // in general, we want to err on the side of allowing the reboot
 368         if (macherr) {
 369                 if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 370                         warnx("WARNING: couldn't lock kext manager for reboot: %s",
 371                                         mach_error_string(macherr));
 372                 rval = 0;
 373         }
 374         // unless we got the lock, clean up our port
 375         if (busyStatus != 0 && myport != MACH_PORT_NULL)
 376                 mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 377
 378         return rval;
 379 }
 380 #endif