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/8.2/sys/kern/kern_shutdown.c 213934 2010-10-16 19:58:49Z avg $");
   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 | CTLFLAG_TUN,
  102         &debugger_on_panic, 0, "Run debugger on kernel panic");
  103 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
  104 
  105 #ifdef KDB_TRACE
  106 static int trace_on_panic = 1;
  107 #else
  108 static int trace_on_panic = 0;
  109 #endif
  110 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  111         &trace_on_panic, 0, "Print stack trace on kernel panic");
  112 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
  113 #endif /* KDB */
  114 
  115 static int sync_on_panic = 0;
  116 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
  117         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  118 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
  119 
  120 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  121 
  122 /*
  123  * Variable panicstr contains argument to first call to panic; used as flag
  124  * to indicate that the kernel has already called panic.
  125  */
  126 const char *panicstr;
  127 
  128 int dumping;                            /* system is dumping */
  129 int rebooting;                          /* system is rebooting */
  130 static struct dumperinfo dumper;        /* our selected dumper */
  131 
  132 /* Context information for dump-debuggers. */
  133 static struct pcb dumppcb;              /* Registers. */
  134 static lwpid_t dumptid;                 /* Thread ID. */
  135 
  136 static void boot(int) __dead2;
  137 static void poweroff_wait(void *, int);
  138 static void shutdown_halt(void *junk, int howto);
  139 static void shutdown_panic(void *junk, int howto);
  140 static void shutdown_reset(void *junk, int howto);
  141 
  142 /* register various local shutdown events */
  143 static void
  144 shutdown_conf(void *unused)
  145 {
  146 
  147         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  148             SHUTDOWN_PRI_FIRST);
  149         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  150             SHUTDOWN_PRI_LAST + 100);
  151         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  152             SHUTDOWN_PRI_LAST + 100);
  153         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  154             SHUTDOWN_PRI_LAST + 200);
  155 }
  156 
  157 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
  158 
  159 /*
  160  * The system call that results in a reboot.
  161  */
  162 /* ARGSUSED */
  163 int
  164 reboot(struct thread *td, struct reboot_args *uap)
  165 {
  166         int error;
  167 
  168         error = 0;
  169 #ifdef MAC
  170         error = mac_system_check_reboot(td->td_ucred, uap->opt);
  171 #endif
  172         if (error == 0)
  173                 error = priv_check(td, PRIV_REBOOT);
  174         if (error == 0) {
  175                 mtx_lock(&Giant);
  176                 boot(uap->opt);
  177                 mtx_unlock(&Giant);
  178         }
  179         return (error);
  180 }
  181 
  182 /*
  183  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  184  */
  185 static int shutdown_howto = 0;
  186 
  187 void
  188 shutdown_nice(int howto)
  189 {
  190 
  191         shutdown_howto = howto;
  192 
  193         /* Send a signal to init(8) and have it shutdown the world */
  194         if (initproc != NULL) {
  195                 PROC_LOCK(initproc);
  196                 psignal(initproc, SIGINT);
  197                 PROC_UNLOCK(initproc);
  198         } else {
  199                 /* No init(8) running, so simply reboot */
  200                 boot(RB_NOSYNC);
  201         }
  202         return;
  203 }
  204 static int      waittime = -1;
  205 
  206 static void
  207 print_uptime(void)
  208 {
  209         int f;
  210         struct timespec ts;
  211 
  212         getnanouptime(&ts);
  213         printf("Uptime: ");
  214         f = 0;
  215         if (ts.tv_sec >= 86400) {
  216                 printf("%ldd", (long)ts.tv_sec / 86400);
  217                 ts.tv_sec %= 86400;
  218                 f = 1;
  219         }
  220         if (f || ts.tv_sec >= 3600) {
  221                 printf("%ldh", (long)ts.tv_sec / 3600);
  222                 ts.tv_sec %= 3600;
  223                 f = 1;
  224         }
  225         if (f || ts.tv_sec >= 60) {
  226                 printf("%ldm", (long)ts.tv_sec / 60);
  227                 ts.tv_sec %= 60;
  228                 f = 1;
  229         }
  230         printf("%lds\n", (long)ts.tv_sec);
  231 }
  232 
  233 static void
  234 doadump(void)
  235 {
  236 
  237         /*
  238          * Sometimes people have to call this from the kernel debugger. 
  239          * (if 'panic' can not dump)
  240          * Give them a clue as to why they can't dump.
  241          */
  242         if (dumper.dumper == NULL) {
  243                 printf("Cannot dump. Device not defined or unavailable.\n");
  244                 return;
  245         }
  246 
  247         savectx(&dumppcb);
  248         dumptid = curthread->td_tid;
  249         dumping++;
  250 #ifdef DDB
  251         if (textdump_pending)
  252                 textdump_dumpsys(&dumper);
  253         else
  254 #endif
  255                 dumpsys(&dumper);
  256         dumping--;
  257 }
  258 
  259 static int
  260 isbufbusy(struct buf *bp)
  261 {
  262         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  263             BUF_ISLOCKED(bp)) ||
  264             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  265                 return (1);
  266         return (0);
  267 }
  268 
  269 /*
  270  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  271  */
  272 static void
  273 boot(int howto)
  274 {
  275         static int first_buf_printf = 1;
  276 
  277 #if defined(SMP)
  278         /*
  279          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  280          * systems don't shutdown properly (i.e., ACPI power off) if we
  281          * run on another processor.
  282          */
  283         thread_lock(curthread);
  284         sched_bind(curthread, 0);
  285         thread_unlock(curthread);
  286         KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  287 #endif
  288         /* We're in the process of rebooting. */
  289         rebooting = 1;
  290 
  291         /* collect extra flags that shutdown_nice might have set */
  292         howto |= shutdown_howto;
  293 
  294         /* We are out of the debugger now. */
  295         kdb_active = 0;
  296 
  297         /*
  298          * Do any callouts that should be done BEFORE syncing the filesystems.
  299          */
  300         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  301 
  302         /* 
  303          * Now sync filesystems
  304          */
  305         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  306                 register struct buf *bp;
  307                 int iter, nbusy, pbusy;
  308 #ifndef PREEMPTION
  309                 int subiter;
  310 #endif
  311 
  312                 waittime = 0;
  313 
  314                 sync(curthread, NULL);
  315 
  316                 /*
  317                  * With soft updates, some buffers that are
  318                  * written will be remarked as dirty until other
  319                  * buffers are written.
  320                  */
  321                 for (iter = pbusy = 0; iter < 20; iter++) {
  322                         nbusy = 0;
  323                         for (bp = &buf[nbuf]; --bp >= buf; )
  324                                 if (isbufbusy(bp))
  325                                         nbusy++;
  326                         if (nbusy == 0) {
  327                                 if (first_buf_printf)
  328                                         printf("All buffers synced.");
  329                                 break;
  330                         }
  331                         if (first_buf_printf) {
  332                                 printf("Syncing disks, buffers remaining... ");
  333                                 first_buf_printf = 0;
  334                         }
  335                         printf("%d ", nbusy);
  336                         if (nbusy < pbusy)
  337                                 iter = 0;
  338                         pbusy = nbusy;
  339                         sync(curthread, NULL);
  340 
  341 #ifdef PREEMPTION
  342                         /*
  343                          * Drop Giant and spin for a while to allow
  344                          * interrupt threads to run.
  345                          */
  346                         DROP_GIANT();
  347                         DELAY(50000 * iter);
  348                         PICKUP_GIANT();
  349 #else
  350                         /*
  351                          * Drop Giant and context switch several times to
  352                          * allow interrupt threads to run.
  353                          */
  354                         DROP_GIANT();
  355                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  356                                 thread_lock(curthread);
  357                                 mi_switch(SW_VOL, NULL);
  358                                 thread_unlock(curthread);
  359                                 DELAY(1000);
  360                         }
  361                         PICKUP_GIANT();
  362 #endif
  363                 }
  364                 printf("\n");
  365                 /*
  366                  * Count only busy local buffers to prevent forcing 
  367                  * a fsck if we're just a client of a wedged NFS server
  368                  */
  369                 nbusy = 0;
  370                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  371                         if (isbufbusy(bp)) {
  372 #if 0
  373 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  374                                 if (bp->b_dev == NULL) {
  375                                         TAILQ_REMOVE(&mountlist,
  376                                             bp->b_vp->v_mount, mnt_list);
  377                                         continue;
  378                                 }
  379 #endif
  380                                 nbusy++;
  381 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  382                                 printf(
  383                             "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
  384                                     nbusy, bp->b_bufobj,
  385                                     bp->b_flags, (long)bp->b_blkno,
  386                                     (long)bp->b_lblkno);
  387 #endif
  388                         }
  389                 }
  390                 if (nbusy) {
  391                         /*
  392                          * Failed to sync all blocks. Indicate this and don't
  393                          * unmount filesystems (thus forcing an fsck on reboot).
  394                          */
  395                         printf("Giving up on %d buffers\n", nbusy);
  396                         DELAY(5000000); /* 5 seconds */
  397                 } else {
  398                         if (!first_buf_printf)
  399                                 printf("Final sync complete\n");
  400                         /*
  401                          * Unmount filesystems
  402                          */
  403                         if (panicstr == 0)
  404                                 vfs_unmountall();
  405                 }
  406                 swapoff_all();
  407                 DELAY(100000);          /* wait for console output to finish */
  408         }
  409 
  410         print_uptime();
  411 
  412         /*
  413          * Ok, now do things that assume all filesystem activity has
  414          * been completed.
  415          */
  416         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  417 
  418         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  419                 doadump();
  420 
  421         /* Now that we're going to really halt the system... */
  422         EVENTHANDLER_INVOKE(shutdown_final, howto);
  423 
  424         for(;;) ;       /* safety against shutdown_reset not working */
  425         /* NOTREACHED */
  426 }
  427 
  428 /*
  429  * If the shutdown was a clean halt, behave accordingly.
  430  */
  431 static void
  432 shutdown_halt(void *junk, int howto)
  433 {
  434 
  435         if (howto & RB_HALT) {
  436                 printf("\n");
  437                 printf("The operating system has halted.\n");
  438                 printf("Please press any key to reboot.\n\n");
  439                 switch (cngetc()) {
  440                 case -1:                /* No console, just die */
  441                         cpu_halt();
  442                         /* NOTREACHED */
  443                 default:
  444                         howto &= ~RB_HALT;
  445                         break;
  446                 }
  447         }
  448 }
  449 
  450 /*
  451  * Check to see if the system paniced, pause and then reboot
  452  * according to the specified delay.
  453  */
  454 static void
  455 shutdown_panic(void *junk, int howto)
  456 {
  457         int loop;
  458 
  459         if (howto & RB_DUMP) {
  460                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  461                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  462                                 printf("Automatic reboot in %d seconds - "
  463                                        "press a key on the console to abort\n",
  464                                         PANIC_REBOOT_WAIT_TIME);
  465                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  466                                      loop > 0; --loop) {
  467                                         DELAY(1000 * 100); /* 1/10th second */
  468                                         /* Did user type a key? */
  469                                         if (cncheckc() != -1)
  470                                                 break;
  471                                 }
  472                                 if (!loop)
  473                                         return;
  474                         }
  475                 } else { /* zero time specified - reboot NOW */
  476                         return;
  477                 }
  478                 printf("--> Press a key on the console to reboot,\n");
  479                 printf("--> or switch off the system now.\n");
  480                 cngetc();
  481         }
  482 }
  483 
  484 /*
  485  * Everything done, now reset
  486  */
  487 static void
  488 shutdown_reset(void *junk, int howto)
  489 {
  490 
  491         printf("Rebooting...\n");
  492         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  493 
  494         /*
  495          * Acquiring smp_ipi_mtx here has a double effect:
  496          * - it disables interrupts avoiding CPU0 preemption
  497          *   by fast handlers (thus deadlocking  against other CPUs)
  498          * - it avoids deadlocks against smp_rendezvous() or, more 
  499          *   generally, threads busy-waiting, with this spinlock held,
  500          *   and waiting for responses by threads on other CPUs
  501          *   (ie. smp_tlb_shootdown()).
  502          *
  503          * For the !SMP case it just needs to handle the former problem.
  504          */
  505 #ifdef SMP
  506         mtx_lock_spin(&smp_ipi_mtx);
  507 #else
  508         spinlock_enter();
  509 #endif
  510 
  511         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  512         cpu_reset();
  513         /* NOTREACHED */ /* assuming reset worked */
  514 }
  515 
  516 /*
  517  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  518  * and then reboots.  If we are called twice, then we avoid trying to sync
  519  * the disks as this often leads to recursive panics.
  520  */
  521 void
  522 panic(const char *fmt, ...)
  523 {
  524 #ifdef SMP
  525         static volatile u_int panic_cpu = NOCPU;
  526 #endif
  527         struct thread *td = curthread;
  528         int bootopt, newpanic;
  529         va_list ap;
  530         static char buf[256];
  531 
  532         critical_enter();
  533 #ifdef SMP
  534         /*
  535          * We don't want multiple CPU's to panic at the same time, so we
  536          * use panic_cpu as a simple spinlock.  We have to keep checking
  537          * panic_cpu if we are spinning in case the panic on the first
  538          * CPU is canceled.
  539          */
  540         if (panic_cpu != PCPU_GET(cpuid))
  541                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  542                     PCPU_GET(cpuid)) == 0)
  543                         while (panic_cpu != NOCPU)
  544                                 ; /* nothing */
  545 #endif
  546 
  547         bootopt = RB_AUTOBOOT | RB_DUMP;
  548         newpanic = 0;
  549         if (panicstr)
  550                 bootopt |= RB_NOSYNC;
  551         else {
  552                 panicstr = fmt;
  553                 newpanic = 1;
  554         }
  555 
  556         va_start(ap, fmt);
  557         if (newpanic) {
  558                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  559                 panicstr = buf;
  560                 printf("panic: %s\n", buf);
  561         } else {
  562                 printf("panic: ");
  563                 vprintf(fmt, ap);
  564                 printf("\n");
  565         }
  566         va_end(ap);
  567 #ifdef SMP
  568         printf("cpuid = %d\n", PCPU_GET(cpuid));
  569 #endif
  570 
  571 #ifdef KDB
  572         if (newpanic && trace_on_panic)
  573                 kdb_backtrace();
  574         if (debugger_on_panic)
  575                 kdb_enter(KDB_WHY_PANIC, "panic");
  576 #ifdef RESTARTABLE_PANICS
  577         /* See if the user aborted the panic, in which case we continue. */
  578         if (panicstr == NULL) {
  579 #ifdef SMP
  580                 atomic_store_rel_int(&panic_cpu, NOCPU);
  581 #endif
  582                 return;
  583         }
  584 #endif
  585 #endif
  586         /*thread_lock(td); */
  587         td->td_flags |= TDF_INPANIC;
  588         /* thread_unlock(td); */
  589         if (!sync_on_panic)
  590                 bootopt |= RB_NOSYNC;
  591         critical_exit();
  592         boot(bootopt);
  593 }
  594 
  595 /*
  596  * Support for poweroff delay.
  597  */
  598 #ifndef POWEROFF_DELAY
  599 # define POWEROFF_DELAY 5000
  600 #endif
  601 static int poweroff_delay = POWEROFF_DELAY;
  602 
  603 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  604         &poweroff_delay, 0, "");
  605 
  606 static void
  607 poweroff_wait(void *junk, int howto)
  608 {
  609 
  610         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  611                 return;
  612         DELAY(poweroff_delay * 1000);
  613 }
  614 
  615 /*
  616  * Some system processes (e.g. syncer) need to be stopped at appropriate
  617  * points in their main loops prior to a system shutdown, so that they
  618  * won't interfere with the shutdown process (e.g. by holding a disk buf
  619  * to cause sync to fail).  For each of these system processes, register
  620  * shutdown_kproc() as a handler for one of shutdown events.
  621  */
  622 static int kproc_shutdown_wait = 60;
  623 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  624     &kproc_shutdown_wait, 0, "");
  625 
  626 void
  627 kproc_shutdown(void *arg, int howto)
  628 {
  629         struct proc *p;
  630         char procname[MAXCOMLEN + 1];
  631         int error;
  632 
  633         if (panicstr)
  634                 return;
  635 
  636         p = (struct proc *)arg;
  637         strlcpy(procname, p->p_comm, sizeof(procname));
  638         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  639             kproc_shutdown_wait, procname);
  640         error = kproc_suspend(p, kproc_shutdown_wait * hz);
  641 
  642         if (error == EWOULDBLOCK)
  643                 printf("timed out\n");
  644         else
  645                 printf("done\n");
  646 }
  647 
  648 void
  649 kthread_shutdown(void *arg, int howto)
  650 {
  651         struct thread *td;
  652         char procname[MAXCOMLEN + 1];
  653         int error;
  654 
  655         if (panicstr)
  656                 return;
  657 
  658         td = (struct thread *)arg;
  659         strlcpy(procname, td->td_name, sizeof(procname));
  660         printf("Waiting (max %d seconds) for system thread `%s' to stop...",
  661             kproc_shutdown_wait, procname);
  662         error = kthread_suspend(td, kproc_shutdown_wait * hz);
  663 
  664         if (error == EWOULDBLOCK)
  665                 printf("timed out\n");
  666         else
  667                 printf("done\n");
  668 }
  669 
  670 /* Registration of dumpers */
  671 int
  672 set_dumper(struct dumperinfo *di)
  673 {
  674 
  675         if (di == NULL) {
  676                 bzero(&dumper, sizeof dumper);
  677                 return (0);
  678         }
  679         if (dumper.dumper != NULL)
  680                 return (EBUSY);
  681         dumper = *di;
  682         return (0);
  683 }
  684 
  685 /* Call dumper with bounds checking. */
  686 int
  687 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
  688     off_t offset, size_t length)
  689 {
  690 
  691         if (length != 0 && (offset < di->mediaoffset ||
  692             offset - di->mediaoffset + length > di->mediasize)) {
  693                 printf("Attempt to write outside dump device boundaries.\n");
  694                 return (ENXIO);
  695         }
  696         return (di->dumper(di->priv, virtual, physical, offset, length));
  697 }
  698 
  699 void
  700 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
  701     uint64_t dumplen, uint32_t blksz)
  702 {
  703 
  704         bzero(kdh, sizeof(*kdh));
  705         strncpy(kdh->magic, magic, sizeof(kdh->magic));
  706         strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
  707         kdh->version = htod32(KERNELDUMPVERSION);
  708         kdh->architectureversion = htod32(archver);
  709         kdh->dumplength = htod64(dumplen);
  710         kdh->dumptime = htod64(time_second);
  711         kdh->blocksize = htod32(blksz);
  712         strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
  713         strncpy(kdh->versionstring, version, sizeof(kdh->versionstring));
  714         if (panicstr != NULL)
  715                 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
  716         kdh->parity = kerneldump_parity(kdh);
  717 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_shutdown.c

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