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/9.0/sys/kern/kern_shutdown.c 225617 2011-09-16 13:58:51Z kmacy $");
   39 
   40 #include "opt_ddb.h"
   41 #include "opt_kdb.h"
   42 #include "opt_panic.h"
   43 #include "opt_sched.h"
   44 #include "opt_watchdog.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 #include <sys/vnode.h>
   69 #ifdef SW_WATCHDOG
   70 #include <sys/watchdog.h>
   71 #endif
   72 
   73 #include <ddb/ddb.h>
   74 
   75 #include <machine/cpu.h>
   76 #include <machine/pcb.h>
   77 #include <machine/smp.h>
   78 
   79 #include <security/mac/mac_framework.h>
   80 
   81 #include <vm/vm.h>
   82 #include <vm/vm_object.h>
   83 #include <vm/vm_page.h>
   84 #include <vm/vm_pager.h>
   85 #include <vm/swap_pager.h>
   86 
   87 #include <sys/signalvar.h>
   88 
   89 #ifndef PANIC_REBOOT_WAIT_TIME
   90 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   91 #endif
   92 
   93 /*
   94  * Note that stdarg.h and the ANSI style va_start macro is used for both
   95  * ANSI and traditional C compilers.
   96  */
   97 #include <machine/stdarg.h>
   98 
   99 #ifdef KDB
  100 #ifdef KDB_UNATTENDED
  101 int debugger_on_panic = 0;
  102 #else
  103 int debugger_on_panic = 1;
  104 #endif
  105 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  106         &debugger_on_panic, 0, "Run debugger on kernel panic");
  107 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
  108 
  109 #ifdef KDB_TRACE
  110 static int trace_on_panic = 1;
  111 #else
  112 static int trace_on_panic = 0;
  113 #endif
  114 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  115         &trace_on_panic, 0, "Print stack trace on kernel panic");
  116 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
  117 #endif /* KDB */
  118 
  119 static int sync_on_panic = 0;
  120 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  121         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  122 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
  123 
  124 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  125 
  126 #ifndef DIAGNOSTIC
  127 static int show_busybufs;
  128 #else
  129 static int show_busybufs = 1;
  130 #endif
  131 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
  132         &show_busybufs, 0, "");
  133 
  134 /*
  135  * Variable panicstr contains argument to first call to panic; used as flag
  136  * to indicate that the kernel has already called panic.
  137  */
  138 const char *panicstr;
  139 
  140 int dumping;                            /* system is dumping */
  141 int rebooting;                          /* system is rebooting */
  142 static struct dumperinfo dumper;        /* our selected dumper */
  143 
  144 /* Context information for dump-debuggers. */
  145 static struct pcb dumppcb;              /* Registers. */
  146 static lwpid_t dumptid;                 /* Thread ID. */
  147 
  148 static void poweroff_wait(void *, int);
  149 static void shutdown_halt(void *junk, int howto);
  150 static void shutdown_panic(void *junk, int howto);
  151 static void shutdown_reset(void *junk, int howto);
  152 
  153 /* register various local shutdown events */
  154 static void
  155 shutdown_conf(void *unused)
  156 {
  157 
  158         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  159             SHUTDOWN_PRI_FIRST);
  160         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  161             SHUTDOWN_PRI_LAST + 100);
  162         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  163             SHUTDOWN_PRI_LAST + 100);
  164         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  165             SHUTDOWN_PRI_LAST + 200);
  166 }
  167 
  168 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
  169 
  170 /*
  171  * The system call that results in a reboot.
  172  */
  173 /* ARGSUSED */
  174 int
  175 sys_reboot(struct thread *td, struct reboot_args *uap)
  176 {
  177         int error;
  178 
  179         error = 0;
  180 #ifdef MAC
  181         error = mac_system_check_reboot(td->td_ucred, uap->opt);
  182 #endif
  183         if (error == 0)
  184                 error = priv_check(td, PRIV_REBOOT);
  185         if (error == 0) {
  186                 mtx_lock(&Giant);
  187                 kern_reboot(uap->opt);
  188                 mtx_unlock(&Giant);
  189         }
  190         return (error);
  191 }
  192 
  193 /*
  194  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  195  */
  196 static int shutdown_howto = 0;
  197 
  198 void
  199 shutdown_nice(int howto)
  200 {
  201 
  202         shutdown_howto = howto;
  203 
  204         /* Send a signal to init(8) and have it shutdown the world */
  205         if (initproc != NULL) {
  206                 PROC_LOCK(initproc);
  207                 kern_psignal(initproc, SIGINT);
  208                 PROC_UNLOCK(initproc);
  209         } else {
  210                 /* No init(8) running, so simply reboot */
  211                 kern_reboot(RB_NOSYNC);
  212         }
  213         return;
  214 }
  215 static int      waittime = -1;
  216 
  217 static void
  218 print_uptime(void)
  219 {
  220         int f;
  221         struct timespec ts;
  222 
  223         getnanouptime(&ts);
  224         printf("Uptime: ");
  225         f = 0;
  226         if (ts.tv_sec >= 86400) {
  227                 printf("%ldd", (long)ts.tv_sec / 86400);
  228                 ts.tv_sec %= 86400;
  229                 f = 1;
  230         }
  231         if (f || ts.tv_sec >= 3600) {
  232                 printf("%ldh", (long)ts.tv_sec / 3600);
  233                 ts.tv_sec %= 3600;
  234                 f = 1;
  235         }
  236         if (f || ts.tv_sec >= 60) {
  237                 printf("%ldm", (long)ts.tv_sec / 60);
  238                 ts.tv_sec %= 60;
  239                 f = 1;
  240         }
  241         printf("%lds\n", (long)ts.tv_sec);
  242 }
  243 
  244 int
  245 doadump(boolean_t textdump)
  246 {
  247         boolean_t coredump;
  248 
  249         if (dumping)
  250                 return (EBUSY);
  251         if (dumper.dumper == NULL)
  252                 return (ENXIO);
  253 
  254         savectx(&dumppcb);
  255         dumptid = curthread->td_tid;
  256         dumping++;
  257 
  258         coredump = TRUE;
  259 #ifdef DDB
  260         if (textdump && textdump_pending) {
  261                 coredump = FALSE;
  262                 textdump_dumpsys(&dumper);
  263         }
  264 #endif
  265         if (coredump)
  266                 dumpsys(&dumper);
  267 
  268         dumping--;
  269         return (0);
  270 }
  271 
  272 static int
  273 isbufbusy(struct buf *bp)
  274 {
  275         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  276             BUF_ISLOCKED(bp)) ||
  277             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  278                 return (1);
  279         return (0);
  280 }
  281 
  282 /*
  283  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  284  */
  285 void
  286 kern_reboot(int howto)
  287 {
  288         static int first_buf_printf = 1;
  289 
  290 #if defined(SMP)
  291         /*
  292          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  293          * systems don't shutdown properly (i.e., ACPI power off) if we
  294          * run on another processor.
  295          */
  296         thread_lock(curthread);
  297         sched_bind(curthread, 0);
  298         thread_unlock(curthread);
  299         KASSERT(PCPU_GET(cpuid) == 0, ("%s: not running on cpu 0", __func__));
  300 #endif
  301         /* We're in the process of rebooting. */
  302         rebooting = 1;
  303 
  304         /* collect extra flags that shutdown_nice might have set */
  305         howto |= shutdown_howto;
  306 
  307         /* We are out of the debugger now. */
  308         kdb_active = 0;
  309 
  310         /*
  311          * Do any callouts that should be done BEFORE syncing the filesystems.
  312          */
  313         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  314 
  315         /* 
  316          * Now sync filesystems
  317          */
  318         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  319                 register struct buf *bp;
  320                 int iter, nbusy, pbusy;
  321 #ifndef PREEMPTION
  322                 int subiter;
  323 #endif
  324 
  325                 waittime = 0;
  326 
  327 #ifdef SW_WATCHDOG
  328                 wdog_kern_pat(WD_LASTVAL);
  329 #endif
  330                 sys_sync(curthread, NULL);
  331 
  332                 /*
  333                  * With soft updates, some buffers that are
  334                  * written will be remarked as dirty until other
  335                  * buffers are written.
  336                  */
  337                 for (iter = pbusy = 0; iter < 20; iter++) {
  338                         nbusy = 0;
  339                         for (bp = &buf[nbuf]; --bp >= buf; )
  340                                 if (isbufbusy(bp))
  341                                         nbusy++;
  342                         if (nbusy == 0) {
  343                                 if (first_buf_printf)
  344                                         printf("All buffers synced.");
  345                                 break;
  346                         }
  347                         if (first_buf_printf) {
  348                                 printf("Syncing disks, buffers remaining... ");
  349                                 first_buf_printf = 0;
  350                         }
  351                         printf("%d ", nbusy);
  352                         if (nbusy < pbusy)
  353                                 iter = 0;
  354                         pbusy = nbusy;
  355 #ifdef SW_WATCHDOG
  356                         wdog_kern_pat(WD_LASTVAL);
  357 #endif
  358                         sys_sync(curthread, NULL);
  359 
  360 #ifdef PREEMPTION
  361                         /*
  362                          * Drop Giant and spin for a while to allow
  363                          * interrupt threads to run.
  364                          */
  365                         DROP_GIANT();
  366                         DELAY(50000 * iter);
  367                         PICKUP_GIANT();
  368 #else
  369                         /*
  370                          * Drop Giant and context switch several times to
  371                          * allow interrupt threads to run.
  372                          */
  373                         DROP_GIANT();
  374                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  375                                 thread_lock(curthread);
  376                                 mi_switch(SW_VOL, NULL);
  377                                 thread_unlock(curthread);
  378                                 DELAY(1000);
  379                         }
  380                         PICKUP_GIANT();
  381 #endif
  382                 }
  383                 printf("\n");
  384                 /*
  385                  * Count only busy local buffers to prevent forcing 
  386                  * a fsck if we're just a client of a wedged NFS server
  387                  */
  388                 nbusy = 0;
  389                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  390                         if (isbufbusy(bp)) {
  391 #if 0
  392 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  393                                 if (bp->b_dev == NULL) {
  394                                         TAILQ_REMOVE(&mountlist,
  395                                             bp->b_vp->v_mount, mnt_list);
  396                                         continue;
  397                                 }
  398 #endif
  399                                 nbusy++;
  400                                 if (show_busybufs > 0) {
  401                                         printf(
  402             "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:",
  403                                             nbusy, bp, bp->b_vp, bp->b_flags,
  404                                             (intmax_t)bp->b_blkno,
  405                                             (intmax_t)bp->b_lblkno);
  406                                         BUF_LOCKPRINTINFO(bp);
  407                                         if (show_busybufs > 1)
  408                                                 vn_printf(bp->b_vp,
  409                                                     "vnode content: ");
  410                                 }
  411                         }
  412                 }
  413                 if (nbusy) {
  414                         /*
  415                          * Failed to sync all blocks. Indicate this and don't
  416                          * unmount filesystems (thus forcing an fsck on reboot).
  417                          */
  418                         printf("Giving up on %d buffers\n", nbusy);
  419                         DELAY(5000000); /* 5 seconds */
  420                 } else {
  421                         if (!first_buf_printf)
  422                                 printf("Final sync complete\n");
  423                         /*
  424                          * Unmount filesystems
  425                          */
  426                         if (panicstr == 0)
  427                                 vfs_unmountall();
  428                 }
  429                 swapoff_all();
  430                 DELAY(100000);          /* wait for console output to finish */
  431         }
  432 
  433         print_uptime();
  434 
  435         /*
  436          * Ok, now do things that assume all filesystem activity has
  437          * been completed.
  438          */
  439         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  440 
  441         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  442                 doadump(TRUE);
  443 
  444         /* Now that we're going to really halt the system... */
  445         EVENTHANDLER_INVOKE(shutdown_final, howto);
  446 
  447         for(;;) ;       /* safety against shutdown_reset not working */
  448         /* NOTREACHED */
  449 }
  450 
  451 /*
  452  * If the shutdown was a clean halt, behave accordingly.
  453  */
  454 static void
  455 shutdown_halt(void *junk, int howto)
  456 {
  457 
  458         if (howto & RB_HALT) {
  459                 printf("\n");
  460                 printf("The operating system has halted.\n");
  461                 printf("Please press any key to reboot.\n\n");
  462                 switch (cngetc()) {
  463                 case -1:                /* No console, just die */
  464                         cpu_halt();
  465                         /* NOTREACHED */
  466                 default:
  467                         howto &= ~RB_HALT;
  468                         break;
  469                 }
  470         }
  471 }
  472 
  473 /*
  474  * Check to see if the system paniced, pause and then reboot
  475  * according to the specified delay.
  476  */
  477 static void
  478 shutdown_panic(void *junk, int howto)
  479 {
  480         int loop;
  481 
  482         if (howto & RB_DUMP) {
  483                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  484                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  485                                 printf("Automatic reboot in %d seconds - "
  486                                        "press a key on the console to abort\n",
  487                                         PANIC_REBOOT_WAIT_TIME);
  488                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  489                                      loop > 0; --loop) {
  490                                         DELAY(1000 * 100); /* 1/10th second */
  491                                         /* Did user type a key? */
  492                                         if (cncheckc() != -1)
  493                                                 break;
  494                                 }
  495                                 if (!loop)
  496                                         return;
  497                         }
  498                 } else { /* zero time specified - reboot NOW */
  499                         return;
  500                 }
  501                 printf("--> Press a key on the console to reboot,\n");
  502                 printf("--> or switch off the system now.\n");
  503                 cngetc();
  504         }
  505 }
  506 
  507 /*
  508  * Everything done, now reset
  509  */
  510 static void
  511 shutdown_reset(void *junk, int howto)
  512 {
  513 
  514         printf("Rebooting...\n");
  515         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  516 
  517         /*
  518          * Acquiring smp_ipi_mtx here has a double effect:
  519          * - it disables interrupts avoiding CPU0 preemption
  520          *   by fast handlers (thus deadlocking  against other CPUs)
  521          * - it avoids deadlocks against smp_rendezvous() or, more 
  522          *   generally, threads busy-waiting, with this spinlock held,
  523          *   and waiting for responses by threads on other CPUs
  524          *   (ie. smp_tlb_shootdown()).
  525          *
  526          * For the !SMP case it just needs to handle the former problem.
  527          */
  528 #ifdef SMP
  529         mtx_lock_spin(&smp_ipi_mtx);
  530 #else
  531         spinlock_enter();
  532 #endif
  533 
  534         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  535         cpu_reset();
  536         /* NOTREACHED */ /* assuming reset worked */
  537 }
  538 
  539 /*
  540  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  541  * and then reboots.  If we are called twice, then we avoid trying to sync
  542  * the disks as this often leads to recursive panics.
  543  */
  544 void
  545 panic(const char *fmt, ...)
  546 {
  547 #ifdef SMP
  548         static volatile u_int panic_cpu = NOCPU;
  549 #endif
  550         struct thread *td = curthread;
  551         int bootopt, newpanic;
  552         va_list ap;
  553         static char buf[256];
  554 
  555         critical_enter();
  556 #ifdef SMP
  557         /*
  558          * We don't want multiple CPU's to panic at the same time, so we
  559          * use panic_cpu as a simple spinlock.  We have to keep checking
  560          * panic_cpu if we are spinning in case the panic on the first
  561          * CPU is canceled.
  562          */
  563         if (panic_cpu != PCPU_GET(cpuid))
  564                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  565                     PCPU_GET(cpuid)) == 0)
  566                         while (panic_cpu != NOCPU)
  567                                 ; /* nothing */
  568 #endif
  569 
  570         bootopt = RB_AUTOBOOT;
  571         newpanic = 0;
  572         if (panicstr)
  573                 bootopt |= RB_NOSYNC;
  574         else {
  575                 bootopt |= RB_DUMP;
  576                 panicstr = fmt;
  577                 newpanic = 1;
  578         }
  579 
  580         va_start(ap, fmt);
  581         if (newpanic) {
  582                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  583                 panicstr = buf;
  584                 printf("panic: %s\n", buf);
  585         } else {
  586                 printf("panic: ");
  587                 vprintf(fmt, ap);
  588                 printf("\n");
  589         }
  590         va_end(ap);
  591 #ifdef SMP
  592         printf("cpuid = %d\n", PCPU_GET(cpuid));
  593 #endif
  594 
  595 #ifdef KDB
  596         if (newpanic && trace_on_panic)
  597                 kdb_backtrace();
  598         if (debugger_on_panic)
  599                 kdb_enter(KDB_WHY_PANIC, "panic");
  600 #endif
  601         /*thread_lock(td); */
  602         td->td_flags |= TDF_INPANIC;
  603         /* thread_unlock(td); */
  604         if (!sync_on_panic)
  605                 bootopt |= RB_NOSYNC;
  606         critical_exit();
  607         kern_reboot(bootopt);
  608 }
  609 
  610 /*
  611  * Support for poweroff delay.
  612  *
  613  * Please note that setting this delay too short might power off your machine
  614  * before the write cache on your hard disk has been flushed, leading to
  615  * soft-updates inconsistencies.
  616  */
  617 #ifndef POWEROFF_DELAY
  618 # define POWEROFF_DELAY 5000
  619 #endif
  620 static int poweroff_delay = POWEROFF_DELAY;
  621 
  622 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  623         &poweroff_delay, 0, "");
  624 
  625 static void
  626 poweroff_wait(void *junk, int howto)
  627 {
  628 
  629         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  630                 return;
  631         DELAY(poweroff_delay * 1000);
  632 }
  633 
  634 /*
  635  * Some system processes (e.g. syncer) need to be stopped at appropriate
  636  * points in their main loops prior to a system shutdown, so that they
  637  * won't interfere with the shutdown process (e.g. by holding a disk buf
  638  * to cause sync to fail).  For each of these system processes, register
  639  * shutdown_kproc() as a handler for one of shutdown events.
  640  */
  641 static int kproc_shutdown_wait = 60;
  642 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  643     &kproc_shutdown_wait, 0, "");
  644 
  645 void
  646 kproc_shutdown(void *arg, int howto)
  647 {
  648         struct proc *p;
  649         int error;
  650 
  651         if (panicstr)
  652                 return;
  653 
  654         p = (struct proc *)arg;
  655         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  656             kproc_shutdown_wait, p->p_comm);
  657         error = kproc_suspend(p, kproc_shutdown_wait * hz);
  658 
  659         if (error == EWOULDBLOCK)
  660                 printf("timed out\n");
  661         else
  662                 printf("done\n");
  663 }
  664 
  665 void
  666 kthread_shutdown(void *arg, int howto)
  667 {
  668         struct thread *td;
  669         int error;
  670 
  671         if (panicstr)
  672                 return;
  673 
  674         td = (struct thread *)arg;
  675         printf("Waiting (max %d seconds) for system thread `%s' to stop...",
  676             kproc_shutdown_wait, td->td_name);
  677         error = kthread_suspend(td, kproc_shutdown_wait * hz);
  678 
  679         if (error == EWOULDBLOCK)
  680                 printf("timed out\n");
  681         else
  682                 printf("done\n");
  683 }
  684 
  685 /* Registration of dumpers */
  686 int
  687 set_dumper(struct dumperinfo *di)
  688 {
  689 
  690         if (di == NULL) {
  691                 bzero(&dumper, sizeof dumper);
  692                 return (0);
  693         }
  694         if (dumper.dumper != NULL)
  695                 return (EBUSY);
  696         dumper = *di;
  697         return (0);
  698 }
  699 
  700 /* Call dumper with bounds checking. */
  701 int
  702 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
  703     off_t offset, size_t length)
  704 {
  705 
  706         if (length != 0 && (offset < di->mediaoffset ||
  707             offset - di->mediaoffset + length > di->mediasize)) {
  708                 printf("Attempt to write outside dump device boundaries.\n"
  709             "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
  710                     (intmax_t)offset, (intmax_t)di->mediaoffset,
  711                     (uintmax_t)length, (intmax_t)di->mediasize);
  712                 return (ENOSPC);
  713         }
  714         return (di->dumper(di->priv, virtual, physical, offset, length));
  715 }
  716 
  717 void
  718 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
  719     uint64_t dumplen, uint32_t blksz)
  720 {
  721 
  722         bzero(kdh, sizeof(*kdh));
  723         strncpy(kdh->magic, magic, sizeof(kdh->magic));
  724         strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
  725         kdh->version = htod32(KERNELDUMPVERSION);
  726         kdh->architectureversion = htod32(archver);
  727         kdh->dumplength = htod64(dumplen);
  728         kdh->dumptime = htod64(time_second);
  729         kdh->blocksize = htod32(blksz);
  730         strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
  731         strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
  732         if (panicstr != NULL)
  733                 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
  734         kdh->parity = kerneldump_parity(kdh);
  735 }

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