The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_shutdown.c

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    1 /*-
    2  * Copyright (c) 1986, 1988, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)kern_shutdown.c     8.3 (Berkeley) 1/21/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/8.1/sys/kern/kern_shutdown.c 208055 2010-05-14 01:43:13Z attilio $");
   39 
   40 #include "opt_ddb.h"
   41 #include "opt_kdb.h"
   42 #include "opt_panic.h"
   43 #include "opt_show_busybufs.h"
   44 #include "opt_sched.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/bio.h>
   49 #include <sys/buf.h>
   50 #include <sys/conf.h>
   51 #include <sys/cons.h>
   52 #include <sys/eventhandler.h>
   53 #include <sys/jail.h>
   54 #include <sys/kdb.h>
   55 #include <sys/kernel.h>
   56 #include <sys/kerneldump.h>
   57 #include <sys/kthread.h>
   58 #include <sys/malloc.h>
   59 #include <sys/mount.h>
   60 #include <sys/priv.h>
   61 #include <sys/proc.h>
   62 #include <sys/reboot.h>
   63 #include <sys/resourcevar.h>
   64 #include <sys/sched.h>
   65 #include <sys/smp.h>
   66 #include <sys/sysctl.h>
   67 #include <sys/sysproto.h>
   68 
   69 #include <ddb/ddb.h>
   70 
   71 #include <machine/cpu.h>
   72 #include <machine/pcb.h>
   73 #include <machine/smp.h>
   74 
   75 #include <security/mac/mac_framework.h>
   76 
   77 #include <vm/vm.h>
   78 #include <vm/vm_object.h>
   79 #include <vm/vm_page.h>
   80 #include <vm/vm_pager.h>
   81 #include <vm/swap_pager.h>
   82 
   83 #include <sys/signalvar.h>
   84 
   85 #ifndef PANIC_REBOOT_WAIT_TIME
   86 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   87 #endif
   88 
   89 /*
   90  * Note that stdarg.h and the ANSI style va_start macro is used for both
   91  * ANSI and traditional C compilers.
   92  */
   93 #include <machine/stdarg.h>
   94 
   95 #ifdef KDB
   96 #ifdef KDB_UNATTENDED
   97 int debugger_on_panic = 0;
   98 #else
   99 int debugger_on_panic = 1;
  100 #endif
  101 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
  102         &debugger_on_panic, 0, "Run debugger on kernel panic");
  103 
  104 #ifdef KDB_TRACE
  105 int trace_on_panic = 1;
  106 #else
  107 int trace_on_panic = 0;
  108 #endif
  109 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
  110         &trace_on_panic, 0, "Print stack trace on kernel panic");
  111 #endif /* KDB */
  112 
  113 int sync_on_panic = 0;
  114 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  115         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  116 
  117 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  118 
  119 /*
  120  * Variable panicstr contains argument to first call to panic; used as flag
  121  * to indicate that the kernel has already called panic.
  122  */
  123 const char *panicstr;
  124 
  125 int dumping;                            /* system is dumping */
  126 int rebooting;                          /* system is rebooting */
  127 static struct dumperinfo dumper;        /* our selected dumper */
  128 
  129 /* Context information for dump-debuggers. */
  130 static struct pcb dumppcb;              /* Registers. */
  131 static lwpid_t dumptid;                 /* Thread ID. */
  132 
  133 static void boot(int) __dead2;
  134 static void poweroff_wait(void *, int);
  135 static void shutdown_halt(void *junk, int howto);
  136 static void shutdown_panic(void *junk, int howto);
  137 static void shutdown_reset(void *junk, int howto);
  138 
  139 /* register various local shutdown events */
  140 static void
  141 shutdown_conf(void *unused)
  142 {
  143 
  144         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  145             SHUTDOWN_PRI_FIRST);
  146         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  147             SHUTDOWN_PRI_LAST + 100);
  148         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  149             SHUTDOWN_PRI_LAST + 100);
  150         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  151             SHUTDOWN_PRI_LAST + 200);
  152 }
  153 
  154 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
  155 
  156 /*
  157  * The system call that results in a reboot.
  158  */
  159 /* ARGSUSED */
  160 int
  161 reboot(struct thread *td, struct reboot_args *uap)
  162 {
  163         int error;
  164 
  165         error = 0;
  166 #ifdef MAC
  167         error = mac_system_check_reboot(td->td_ucred, uap->opt);
  168 #endif
  169         if (error == 0)
  170                 error = priv_check(td, PRIV_REBOOT);
  171         if (error == 0) {
  172                 mtx_lock(&Giant);
  173                 boot(uap->opt);
  174                 mtx_unlock(&Giant);
  175         }
  176         return (error);
  177 }
  178 
  179 /*
  180  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  181  */
  182 static int shutdown_howto = 0;
  183 
  184 void
  185 shutdown_nice(int howto)
  186 {
  187 
  188         shutdown_howto = howto;
  189 
  190         /* Send a signal to init(8) and have it shutdown the world */
  191         if (initproc != NULL) {
  192                 PROC_LOCK(initproc);
  193                 psignal(initproc, SIGINT);
  194                 PROC_UNLOCK(initproc);
  195         } else {
  196                 /* No init(8) running, so simply reboot */
  197                 boot(RB_NOSYNC);
  198         }
  199         return;
  200 }
  201 static int      waittime = -1;
  202 
  203 static void
  204 print_uptime(void)
  205 {
  206         int f;
  207         struct timespec ts;
  208 
  209         getnanouptime(&ts);
  210         printf("Uptime: ");
  211         f = 0;
  212         if (ts.tv_sec >= 86400) {
  213                 printf("%ldd", (long)ts.tv_sec / 86400);
  214                 ts.tv_sec %= 86400;
  215                 f = 1;
  216         }
  217         if (f || ts.tv_sec >= 3600) {
  218                 printf("%ldh", (long)ts.tv_sec / 3600);
  219                 ts.tv_sec %= 3600;
  220                 f = 1;
  221         }
  222         if (f || ts.tv_sec >= 60) {
  223                 printf("%ldm", (long)ts.tv_sec / 60);
  224                 ts.tv_sec %= 60;
  225                 f = 1;
  226         }
  227         printf("%lds\n", (long)ts.tv_sec);
  228 }
  229 
  230 static void
  231 doadump(void)
  232 {
  233 
  234         /*
  235          * Sometimes people have to call this from the kernel debugger. 
  236          * (if 'panic' can not dump)
  237          * Give them a clue as to why they can't dump.
  238          */
  239         if (dumper.dumper == NULL) {
  240                 printf("Cannot dump. Device not defined or unavailable.\n");
  241                 return;
  242         }
  243 
  244         savectx(&dumppcb);
  245         dumptid = curthread->td_tid;
  246         dumping++;
  247 #ifdef DDB
  248         if (textdump_pending)
  249                 textdump_dumpsys(&dumper);
  250         else
  251 #endif
  252                 dumpsys(&dumper);
  253         dumping--;
  254 }
  255 
  256 static int
  257 isbufbusy(struct buf *bp)
  258 {
  259         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  260             BUF_ISLOCKED(bp)) ||
  261             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  262                 return (1);
  263         return (0);
  264 }
  265 
  266 /*
  267  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  268  */
  269 static void
  270 boot(int howto)
  271 {
  272         static int first_buf_printf = 1;
  273 
  274 #if defined(SMP)
  275         /*
  276          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  277          * systems don't shutdown properly (i.e., ACPI power off) if we
  278          * run on another processor.
  279          */
  280         thread_lock(curthread);
  281         sched_bind(curthread, 0);
  282         thread_unlock(curthread);
  283         KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  284 #endif
  285         /* We're in the process of rebooting. */
  286         rebooting = 1;
  287 
  288         /* collect extra flags that shutdown_nice might have set */
  289         howto |= shutdown_howto;
  290 
  291         /* We are out of the debugger now. */
  292         kdb_active = 0;
  293 
  294         /*
  295          * Do any callouts that should be done BEFORE syncing the filesystems.
  296          */
  297         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  298 
  299         /* 
  300          * Now sync filesystems
  301          */
  302         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  303                 register struct buf *bp;
  304                 int iter, nbusy, pbusy;
  305 #ifndef PREEMPTION
  306                 int subiter;
  307 #endif
  308 
  309                 waittime = 0;
  310 
  311                 sync(curthread, NULL);
  312 
  313                 /*
  314                  * With soft updates, some buffers that are
  315                  * written will be remarked as dirty until other
  316                  * buffers are written.
  317                  */
  318                 for (iter = pbusy = 0; iter < 20; iter++) {
  319                         nbusy = 0;
  320                         for (bp = &buf[nbuf]; --bp >= buf; )
  321                                 if (isbufbusy(bp))
  322                                         nbusy++;
  323                         if (nbusy == 0) {
  324                                 if (first_buf_printf)
  325                                         printf("All buffers synced.");
  326                                 break;
  327                         }
  328                         if (first_buf_printf) {
  329                                 printf("Syncing disks, buffers remaining... ");
  330                                 first_buf_printf = 0;
  331                         }
  332                         printf("%d ", nbusy);
  333                         if (nbusy < pbusy)
  334                                 iter = 0;
  335                         pbusy = nbusy;
  336                         sync(curthread, NULL);
  337 
  338 #ifdef PREEMPTION
  339                         /*
  340                          * Drop Giant and spin for a while to allow
  341                          * interrupt threads to run.
  342                          */
  343                         DROP_GIANT();
  344                         DELAY(50000 * iter);
  345                         PICKUP_GIANT();
  346 #else
  347                         /*
  348                          * Drop Giant and context switch several times to
  349                          * allow interrupt threads to run.
  350                          */
  351                         DROP_GIANT();
  352                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  353                                 thread_lock(curthread);
  354                                 mi_switch(SW_VOL, NULL);
  355                                 thread_unlock(curthread);
  356                                 DELAY(1000);
  357                         }
  358                         PICKUP_GIANT();
  359 #endif
  360                 }
  361                 printf("\n");
  362                 /*
  363                  * Count only busy local buffers to prevent forcing 
  364                  * a fsck if we're just a client of a wedged NFS server
  365                  */
  366                 nbusy = 0;
  367                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  368                         if (isbufbusy(bp)) {
  369 #if 0
  370 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  371                                 if (bp->b_dev == NULL) {
  372                                         TAILQ_REMOVE(&mountlist,
  373                                             bp->b_vp->v_mount, mnt_list);
  374                                         continue;
  375                                 }
  376 #endif
  377                                 nbusy++;
  378 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  379                                 printf(
  380                             "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
  381                                     nbusy, bp->b_bufobj,
  382                                     bp->b_flags, (long)bp->b_blkno,
  383                                     (long)bp->b_lblkno);
  384 #endif
  385                         }
  386                 }
  387                 if (nbusy) {
  388                         /*
  389                          * Failed to sync all blocks. Indicate this and don't
  390                          * unmount filesystems (thus forcing an fsck on reboot).
  391                          */
  392                         printf("Giving up on %d buffers\n", nbusy);
  393                         DELAY(5000000); /* 5 seconds */
  394                 } else {
  395                         if (!first_buf_printf)
  396                                 printf("Final sync complete\n");
  397                         /*
  398                          * Unmount filesystems
  399                          */
  400                         if (panicstr == 0)
  401                                 vfs_unmountall();
  402                 }
  403                 swapoff_all();
  404                 DELAY(100000);          /* wait for console output to finish */
  405         }
  406 
  407         print_uptime();
  408 
  409         /*
  410          * Ok, now do things that assume all filesystem activity has
  411          * been completed.
  412          */
  413         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  414 
  415         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  416                 doadump();
  417 
  418         /* Now that we're going to really halt the system... */
  419         EVENTHANDLER_INVOKE(shutdown_final, howto);
  420 
  421         for(;;) ;       /* safety against shutdown_reset not working */
  422         /* NOTREACHED */
  423 }
  424 
  425 /*
  426  * If the shutdown was a clean halt, behave accordingly.
  427  */
  428 static void
  429 shutdown_halt(void *junk, int howto)
  430 {
  431 
  432         if (howto & RB_HALT) {
  433                 printf("\n");
  434                 printf("The operating system has halted.\n");
  435                 printf("Please press any key to reboot.\n\n");
  436                 switch (cngetc()) {
  437                 case -1:                /* No console, just die */
  438                         cpu_halt();
  439                         /* NOTREACHED */
  440                 default:
  441                         howto &= ~RB_HALT;
  442                         break;
  443                 }
  444         }
  445 }
  446 
  447 /*
  448  * Check to see if the system paniced, pause and then reboot
  449  * according to the specified delay.
  450  */
  451 static void
  452 shutdown_panic(void *junk, int howto)
  453 {
  454         int loop;
  455 
  456         if (howto & RB_DUMP) {
  457                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  458                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  459                                 printf("Automatic reboot in %d seconds - "
  460                                        "press a key on the console to abort\n",
  461                                         PANIC_REBOOT_WAIT_TIME);
  462                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  463                                      loop > 0; --loop) {
  464                                         DELAY(1000 * 100); /* 1/10th second */
  465                                         /* Did user type a key? */
  466                                         if (cncheckc() != -1)
  467                                                 break;
  468                                 }
  469                                 if (!loop)
  470                                         return;
  471                         }
  472                 } else { /* zero time specified - reboot NOW */
  473                         return;
  474                 }
  475                 printf("--> Press a key on the console to reboot,\n");
  476                 printf("--> or switch off the system now.\n");
  477                 cngetc();
  478         }
  479 }
  480 
  481 /*
  482  * Everything done, now reset
  483  */
  484 static void
  485 shutdown_reset(void *junk, int howto)
  486 {
  487 
  488         printf("Rebooting...\n");
  489         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  490 
  491         /*
  492          * Acquiring smp_ipi_mtx here has a double effect:
  493          * - it disables interrupts avoiding CPU0 preemption
  494          *   by fast handlers (thus deadlocking  against other CPUs)
  495          * - it avoids deadlocks against smp_rendezvous() or, more 
  496          *   generally, threads busy-waiting, with this spinlock held,
  497          *   and waiting for responses by threads on other CPUs
  498          *   (ie. smp_tlb_shootdown()).
  499          *
  500          * For the !SMP case it just needs to handle the former problem.
  501          */
  502 #ifdef SMP
  503         mtx_lock_spin(&smp_ipi_mtx);
  504 #else
  505         spinlock_enter();
  506 #endif
  507 
  508         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  509         cpu_reset();
  510         /* NOTREACHED */ /* assuming reset worked */
  511 }
  512 
  513 #ifdef SMP
  514 static u_int panic_cpu = NOCPU;
  515 #endif
  516 
  517 /*
  518  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  519  * and then reboots.  If we are called twice, then we avoid trying to sync
  520  * the disks as this often leads to recursive panics.
  521  */
  522 void
  523 panic(const char *fmt, ...)
  524 {
  525         struct thread *td = curthread;
  526         int bootopt, newpanic;
  527         va_list ap;
  528         static char buf[256];
  529 
  530         critical_enter();
  531 #ifdef SMP
  532         /*
  533          * We don't want multiple CPU's to panic at the same time, so we
  534          * use panic_cpu as a simple spinlock.  We have to keep checking
  535          * panic_cpu if we are spinning in case the panic on the first
  536          * CPU is canceled.
  537          */
  538         if (panic_cpu != PCPU_GET(cpuid))
  539                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  540                     PCPU_GET(cpuid)) == 0)
  541                         while (panic_cpu != NOCPU)
  542                                 ; /* nothing */
  543 #endif
  544 
  545         bootopt = RB_AUTOBOOT | RB_DUMP;
  546         newpanic = 0;
  547         if (panicstr)
  548                 bootopt |= RB_NOSYNC;
  549         else {
  550                 panicstr = fmt;
  551                 newpanic = 1;
  552         }
  553 
  554         va_start(ap, fmt);
  555         if (newpanic) {
  556                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  557                 panicstr = buf;
  558                 printf("panic: %s\n", buf);
  559         } else {
  560                 printf("panic: ");
  561                 vprintf(fmt, ap);
  562                 printf("\n");
  563         }
  564         va_end(ap);
  565 #ifdef SMP
  566         printf("cpuid = %d\n", PCPU_GET(cpuid));
  567 #endif
  568 
  569 #ifdef KDB
  570         if (newpanic && trace_on_panic)
  571                 kdb_backtrace();
  572         if (debugger_on_panic)
  573                 kdb_enter(KDB_WHY_PANIC, "panic");
  574 #ifdef RESTARTABLE_PANICS
  575         /* See if the user aborted the panic, in which case we continue. */
  576         if (panicstr == NULL) {
  577 #ifdef SMP
  578                 atomic_store_rel_int(&panic_cpu, NOCPU);
  579 #endif
  580                 return;
  581         }
  582 #endif
  583 #endif
  584         /*thread_lock(td); */
  585         td->td_flags |= TDF_INPANIC;
  586         /* thread_unlock(td); */
  587         if (!sync_on_panic)
  588                 bootopt |= RB_NOSYNC;
  589         critical_exit();
  590         boot(bootopt);
  591 }
  592 
  593 /*
  594  * Support for poweroff delay.
  595  */
  596 #ifndef POWEROFF_DELAY
  597 # define POWEROFF_DELAY 5000
  598 #endif
  599 static int poweroff_delay = POWEROFF_DELAY;
  600 
  601 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  602         &poweroff_delay, 0, "");
  603 
  604 static void
  605 poweroff_wait(void *junk, int howto)
  606 {
  607 
  608         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  609                 return;
  610         DELAY(poweroff_delay * 1000);
  611 }
  612 
  613 /*
  614  * Some system processes (e.g. syncer) need to be stopped at appropriate
  615  * points in their main loops prior to a system shutdown, so that they
  616  * won't interfere with the shutdown process (e.g. by holding a disk buf
  617  * to cause sync to fail).  For each of these system processes, register
  618  * shutdown_kproc() as a handler for one of shutdown events.
  619  */
  620 static int kproc_shutdown_wait = 60;
  621 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  622     &kproc_shutdown_wait, 0, "");
  623 
  624 void
  625 kproc_shutdown(void *arg, int howto)
  626 {
  627         struct proc *p;
  628         char procname[MAXCOMLEN + 1];
  629         int error;
  630 
  631         if (panicstr)
  632                 return;
  633 
  634         p = (struct proc *)arg;
  635         strlcpy(procname, p->p_comm, sizeof(procname));
  636         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  637             kproc_shutdown_wait, procname);
  638         error = kproc_suspend(p, kproc_shutdown_wait * hz);
  639 
  640         if (error == EWOULDBLOCK)
  641                 printf("timed out\n");
  642         else
  643                 printf("done\n");
  644 }
  645 
  646 void
  647 kthread_shutdown(void *arg, int howto)
  648 {
  649         struct thread *td;
  650         char procname[MAXCOMLEN + 1];
  651         int error;
  652 
  653         if (panicstr)
  654                 return;
  655 
  656         td = (struct thread *)arg;
  657         strlcpy(procname, td->td_name, sizeof(procname));
  658         printf("Waiting (max %d seconds) for system thread `%s' to stop...",
  659             kproc_shutdown_wait, procname);
  660         error = kthread_suspend(td, kproc_shutdown_wait * hz);
  661 
  662         if (error == EWOULDBLOCK)
  663                 printf("timed out\n");
  664         else
  665                 printf("done\n");
  666 }
  667 
  668 /* Registration of dumpers */
  669 int
  670 set_dumper(struct dumperinfo *di)
  671 {
  672 
  673         if (di == NULL) {
  674                 bzero(&dumper, sizeof dumper);
  675                 return (0);
  676         }
  677         if (dumper.dumper != NULL)
  678                 return (EBUSY);
  679         dumper = *di;
  680         return (0);
  681 }
  682 
  683 /* Call dumper with bounds checking. */
  684 int
  685 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
  686     off_t offset, size_t length)
  687 {
  688 
  689         if (length != 0 && (offset < di->mediaoffset ||
  690             offset - di->mediaoffset + length > di->mediasize)) {
  691                 printf("Attempt to write outside dump device boundaries.\n");
  692                 return (ENXIO);
  693         }
  694         return (di->dumper(di->priv, virtual, physical, offset, length));
  695 }
  696 
  697 void
  698 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
  699     uint64_t dumplen, uint32_t blksz)
  700 {
  701 
  702         bzero(kdh, sizeof(*kdh));
  703         strncpy(kdh->magic, magic, sizeof(kdh->magic));
  704         strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
  705         kdh->version = htod32(KERNELDUMPVERSION);
  706         kdh->architectureversion = htod32(archver);
  707         kdh->dumplength = htod64(dumplen);
  708         kdh->dumptime = htod64(time_second);
  709         kdh->blocksize = htod32(blksz);
  710         strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
  711         strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
  712         if (panicstr != NULL)
  713                 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
  714         kdh->parity = kerneldump_parity(kdh);
  715 }

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