Convert to critical sections.
[dragonfly.git] / 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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $
861905fb 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.19 2005/04/19 17:54:42 dillon Exp $
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41 */
42
43#include "opt_ddb.h"
b1e04573 44#include "opt_ddb_trace.h"
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45#include "opt_hw_wdog.h"
46#include "opt_panic.h"
47#include "opt_show_busybufs.h"
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/eventhandler.h>
52#include <sys/buf.h>
53#include <sys/disklabel.h>
54#include <sys/reboot.h>
55#include <sys/proc.h>
56#include <sys/vnode.h>
57#include <sys/kernel.h>
58#include <sys/kthread.h>
59#include <sys/malloc.h>
60#include <sys/mount.h>
61#include <sys/queue.h>
62#include <sys/sysctl.h>
63#include <sys/conf.h>
64#include <sys/sysproto.h>
335dda38 65#include <sys/device.h>
984263bc 66#include <sys/cons.h>
3020e3be 67#include <sys/buf2.h>
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68
69#include <machine/pcb.h>
70#include <machine/clock.h>
71#include <machine/md_var.h>
0f7a3396 72#include <machine/smp.h> /* smp_active_mask, cpuid */
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73
74#include <sys/signalvar.h>
75
76#ifndef PANIC_REBOOT_WAIT_TIME
77#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
78#endif
79
80/*
81 * Note that stdarg.h and the ANSI style va_start macro is used for both
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82 * ANSI and traditional C compilers. We use the machine version to stay
83 * within the confines of the kernel header files.
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84 */
85#include <machine/stdarg.h>
86
87#ifdef DDB
88#ifdef DDB_UNATTENDED
89int debugger_on_panic = 0;
90#else
91int debugger_on_panic = 1;
92#endif
93SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
94 &debugger_on_panic, 0, "Run debugger on kernel panic");
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95
96extern void db_print_backtrace(void);
97
98#ifdef DDB_TRACE
99int trace_on_panic = 1;
100#else
101int trace_on_panic = 0;
102#endif
103SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
104 &trace_on_panic, 0, "Print stack trace on kernel panic");
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105#endif
106
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107static int sync_on_panic = 1;
108SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
109 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
110
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111SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
112
113#ifdef HW_WDOG
114/*
115 * If there is a hardware watchdog, point this at the function needed to
116 * hold it off.
117 * It's needed when the kernel needs to do some lengthy operations.
118 * e.g. in wd.c when dumping core.. It's most annoying to have
119 * your precious core-dump only half written because the wdog kicked in.
120 */
121watchdog_tickle_fn wdog_tickler = NULL;
122#endif /* HW_WDOG */
123
124/*
125 * Variable panicstr contains argument to first call to panic; used as flag
126 * to indicate that the kernel has already called panic.
127 */
128const char *panicstr;
129
130int dumping; /* system is dumping */
131
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132static void boot (int) __dead2;
133static void dumpsys (void);
134static int setdumpdev (dev_t dev);
135static void poweroff_wait (void *, int);
136static void print_uptime (void);
137static void shutdown_halt (void *junk, int howto);
138static void shutdown_panic (void *junk, int howto);
139static void shutdown_reset (void *junk, int howto);
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140
141/* register various local shutdown events */
142static void
143shutdown_conf(void *unused)
144{
145 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
146 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
147 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
148 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
149}
150
151SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
152
153/* ARGSUSED */
154
155/*
156 * The system call that results in a reboot
157 */
158int
41c20dac 159reboot(struct reboot_args *uap)
984263bc 160{
dadab5e9 161 struct thread *td = curthread;
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162 int error;
163
dadab5e9 164 if ((error = suser(td)))
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165 return (error);
166
167 boot(uap->opt);
168 return (0);
169}
170
171/*
172 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
173 */
174static int shutdown_howto = 0;
175
176void
177shutdown_nice(int howto)
178{
179 shutdown_howto = howto;
180
181 /* Send a signal to init(8) and have it shutdown the world */
182 if (initproc != NULL) {
183 psignal(initproc, SIGINT);
184 } else {
185 /* No init(8) running, so simply reboot */
186 boot(RB_NOSYNC);
187 }
188 return;
189}
190static int waittime = -1;
191static struct pcb dumppcb;
192
193static void
194print_uptime()
195{
196 int f;
197 struct timespec ts;
198
199 getnanouptime(&ts);
200 printf("Uptime: ");
201 f = 0;
202 if (ts.tv_sec >= 86400) {
203 printf("%ldd", ts.tv_sec / 86400);
204 ts.tv_sec %= 86400;
205 f = 1;
206 }
207 if (f || ts.tv_sec >= 3600) {
208 printf("%ldh", ts.tv_sec / 3600);
209 ts.tv_sec %= 3600;
210 f = 1;
211 }
212 if (f || ts.tv_sec >= 60) {
213 printf("%ldm", ts.tv_sec / 60);
214 ts.tv_sec %= 60;
215 f = 1;
216 }
217 printf("%lds\n", ts.tv_sec);
218}
219
220/*
221 * Go through the rigmarole of shutting down..
222 * this used to be in machdep.c but I'll be dammned if I could see
223 * anything machine dependant in it.
224 */
225static void
41c20dac 226boot(int howto)
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227{
228
229 /* collect extra flags that shutdown_nice might have set */
230 howto |= shutdown_howto;
231
232#ifdef SMP
0f7a3396 233 if (smp_active_mask > 1) {
72740893 234 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
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235 }
236#endif
237 /*
238 * Do any callouts that should be done BEFORE syncing the filesystems.
239 */
240 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
241
242 /*
243 * Now sync filesystems
244 */
245 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
1fd87d54 246 struct buf *bp;
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247 int iter, nbusy, pbusy;
248
249 waittime = 0;
250 printf("\nsyncing disks... ");
251
41c20dac 252 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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253
254 /*
255 * With soft updates, some buffers that are
256 * written will be remarked as dirty until other
257 * buffers are written.
258 */
259 for (iter = pbusy = 0; iter < 20; iter++) {
260 nbusy = 0;
261 for (bp = &buf[nbuf]; --bp >= buf; ) {
262 if ((bp->b_flags & B_INVAL) == 0 &&
263 BUF_REFCNT(bp) > 0) {
264 nbusy++;
265 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
266 == B_DELWRI) {
267 /* bawrite(bp);*/
268 nbusy++;
269 }
270 }
271 if (nbusy == 0)
272 break;
273 printf("%d ", nbusy);
274 if (nbusy < pbusy)
275 iter = 0;
276 pbusy = nbusy;
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277 /*
278 * XXX:
279 * Process soft update work queue if buffers don't sync
280 * after 6 iterations by permitting the syncer to run.
281 */
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282 if (iter > 5 && bioops.io_sync)
283 (*bioops.io_sync)(NULL);
41c20dac 284 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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285 DELAY(50000 * iter);
286 }
287 printf("\n");
288 /*
289 * Count only busy local buffers to prevent forcing
290 * a fsck if we're just a client of a wedged NFS server
291 */
292 nbusy = 0;
293 for (bp = &buf[nbuf]; --bp >= buf; ) {
294 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
295 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
296 if (bp->b_dev == NODEV) {
861905fb 297 mountlist_remove(bp->b_vp->v_mount);
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298 continue;
299 }
300 nbusy++;
301#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
302 printf(
303 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
304 bp, nbusy, devtoname(bp->b_dev),
305 bp->b_flags, (long)bp->b_blkno,
306 (long)bp->b_lblkno);
307#endif
308 }
309 }
310 if (nbusy) {
311 /*
312 * Failed to sync all blocks. Indicate this and don't
313 * unmount filesystems (thus forcing an fsck on reboot).
314 */
315 printf("giving up on %d buffers\n", nbusy);
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316#ifdef DDB
317 Debugger("busy buffer problem");
318#endif /* DDB */
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319 DELAY(5000000); /* 5 seconds */
320 } else {
321 printf("done\n");
322 /*
323 * Unmount filesystems
324 */
325 if (panicstr == 0)
326 vfs_unmountall();
327 }
328 DELAY(100000); /* wait for console output to finish */
329 }
330
331 print_uptime();
332
333 /*
334 * Ok, now do things that assume all filesystem activity has
335 * been completed.
336 */
337 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
338 splhigh();
339 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
340 dumpsys();
341
342 /* Now that we're going to really halt the system... */
343 EVENTHANDLER_INVOKE(shutdown_final, howto);
344
345 for(;;) ; /* safety against shutdown_reset not working */
346 /* NOTREACHED */
347}
348
349/*
350 * If the shutdown was a clean halt, behave accordingly.
351 */
352static void
353shutdown_halt(void *junk, int howto)
354{
355 if (howto & RB_HALT) {
356 printf("\n");
357 printf("The operating system has halted.\n");
358 printf("Please press any key to reboot.\n\n");
359 switch (cngetc()) {
360 case -1: /* No console, just die */
361 cpu_halt();
362 /* NOTREACHED */
363 default:
364 howto &= ~RB_HALT;
365 break;
366 }
367 }
368}
369
370/*
371 * Check to see if the system paniced, pause and then reboot
372 * according to the specified delay.
373 */
374static void
375shutdown_panic(void *junk, int howto)
376{
377 int loop;
378
379 if (howto & RB_DUMP) {
380 if (PANIC_REBOOT_WAIT_TIME != 0) {
381 if (PANIC_REBOOT_WAIT_TIME != -1) {
382 printf("Automatic reboot in %d seconds - "
383 "press a key on the console to abort\n",
384 PANIC_REBOOT_WAIT_TIME);
385 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
386 loop > 0; --loop) {
387 DELAY(1000 * 100); /* 1/10th second */
388 /* Did user type a key? */
389 if (cncheckc() != -1)
390 break;
391 }
392 if (!loop)
393 return;
394 }
395 } else { /* zero time specified - reboot NOW */
396 return;
397 }
398 printf("--> Press a key on the console to reboot,\n");
399 printf("--> or switch off the system now.\n");
400 cngetc();
401 }
402}
403
404/*
405 * Everything done, now reset
406 */
407static void
408shutdown_reset(void *junk, int howto)
409{
410 printf("Rebooting...\n");
411 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
412 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
413 cpu_reset();
414 /* NOTREACHED */ /* assuming reset worked */
415}
416
417/*
418 * Magic number for savecore
419 *
420 * exported (symorder) and used at least by savecore(8)
421 *
422 */
423static u_long const dumpmag = 0x8fca0101UL;
424
425static int dumpsize = 0; /* also for savecore */
426
427static int dodump = 1;
428
429SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
430 "Try to perform coredump on kernel panic");
431
432static int
433setdumpdev(dev)
434 dev_t dev;
435{
436 int psize;
437 long newdumplo;
438
439 if (dev == NODEV) {
440 dumpdev = dev;
441 return (0);
442 }
335dda38 443 psize = dev_dpsize(dev);
984263bc 444 if (psize == -1)
335dda38 445 return (ENXIO);
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446 /*
447 * XXX should clean up checking in dumpsys() to be more like this.
448 */
449 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
450 if (newdumplo <= LABELSECTOR)
451 return (ENOSPC);
452 dumpdev = dev;
453 dumplo = newdumplo;
454 return (0);
455}
456
457
458/* ARGSUSED */
402ed7e1 459static void dump_conf (void *dummy);
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460static void
461dump_conf(dummy)
462 void *dummy;
463{
464 char *path;
465 dev_t dev;
466
467 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
468 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
469 dev = getdiskbyname(path);
470 if (dev != NODEV)
471 dumpdev = dev;
472 }
473 free(path, M_TEMP);
474 if (setdumpdev(dumpdev) != 0)
475 dumpdev = NODEV;
476}
477
478SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
479
480static int
481sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
482{
483 int error;
484 udev_t ndumpdev;
485
486 ndumpdev = dev2udev(dumpdev);
487 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
488 if (error == 0 && req->newptr != NULL)
489 error = setdumpdev(udev2dev(ndumpdev, 0));
490 return (error);
491}
492
493SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
494 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
495
496/*
497 * Doadump comes here after turning off memory management and
498 * getting on the dump stack, either when called above, or by
499 * the auto-restart code.
500 */
501static void
502dumpsys(void)
503{
504 int error;
505
506 savectx(&dumppcb);
507 if (dumping++) {
508 printf("Dump already in progress, bailing...\n");
509 return;
510 }
511 if (!dodump)
512 return;
513 if (dumpdev == NODEV)
514 return;
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515 dumpsize = Maxmem;
516 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
517 printf("dump ");
335dda38 518 error = dev_ddump(dumpdev);
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519 if (error == 0) {
520 printf("succeeded\n");
521 return;
522 }
523 printf("failed, reason: ");
524 switch (error) {
335dda38 525 case ENOSYS:
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526 case ENODEV:
527 printf("device doesn't support a dump routine\n");
528 break;
529
530 case ENXIO:
531 printf("device bad\n");
532 break;
533
534 case EFAULT:
535 printf("device not ready\n");
536 break;
537
538 case EINVAL:
539 printf("area improper\n");
540 break;
541
542 case EIO:
543 printf("i/o error\n");
544 break;
545
546 case EINTR:
547 printf("aborted from console\n");
548 break;
549
550 default:
551 printf("unknown, error = %d\n", error);
552 break;
553 }
554}
555
556int
557dumpstatus(vm_offset_t addr, off_t count)
558{
559 int c;
560
561 if (addr % (1024 * 1024) == 0) {
562#ifdef HW_WDOG
563 if (wdog_tickler)
564 (*wdog_tickler)();
565#endif
566 printf("%ld ", (long)(count / (1024 * 1024)));
567 }
568
569 if ((c = cncheckc()) == 0x03)
570 return -1;
571 else if (c != -1)
572 printf("[CTRL-C to abort] ");
573
574 return 0;
575}
576
577/*
578 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
579 * and then reboots. If we are called twice, then we avoid trying to sync
580 * the disks as this often leads to recursive panics.
581 */
582void
583panic(const char *fmt, ...)
584{
b1e04573 585 int bootopt, newpanic;
e2565a42 586 __va_list ap;
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587 static char buf[256];
588
589 bootopt = RB_AUTOBOOT | RB_DUMP;
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590 if (sync_on_panic == 0)
591 bootopt |= RB_NOSYNC;
b1e04573 592 newpanic = 0;
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593 if (panicstr)
594 bootopt |= RB_NOSYNC;
b1e04573 595 else {
984263bc 596 panicstr = fmt;
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597 newpanic = 1;
598 }
984263bc 599
e2565a42 600 __va_start(ap, fmt);
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601 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
602 if (panicstr == fmt)
603 panicstr = buf;
e2565a42 604 __va_end(ap);
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605 printf("panic: %s\n", buf);
606#ifdef SMP
7a44d1cb 607 /* three separate prints in case of an unmapped page and trap */
984263bc 608 printf("mp_lock = %08x; ", mp_lock);
72740893 609 printf("cpuid = %d; ", mycpu->gd_cpuid);
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610 printf("lapic.id = %08x\n", lapic.id);
611#endif
612
613#if defined(DDB)
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614 if (newpanic && trace_on_panic)
615 db_print_backtrace();
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616 if (debugger_on_panic)
617 Debugger ("panic");
618#endif
619 boot(bootopt);
620}
621
622/*
623 * Support for poweroff delay.
624 */
625#ifndef POWEROFF_DELAY
626# define POWEROFF_DELAY 5000
627#endif
628static int poweroff_delay = POWEROFF_DELAY;
629
630SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
631 &poweroff_delay, 0, "");
632
633static void
634poweroff_wait(void *junk, int howto)
635{
636 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
637 return;
638 DELAY(poweroff_delay * 1000);
639}
640
641/*
642 * Some system processes (e.g. syncer) need to be stopped at appropriate
643 * points in their main loops prior to a system shutdown, so that they
644 * won't interfere with the shutdown process (e.g. by holding a disk buf
645 * to cause sync to fail). For each of these system processes, register
646 * shutdown_kproc() as a handler for one of shutdown events.
647 */
648static int kproc_shutdown_wait = 60;
649SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
650 &kproc_shutdown_wait, 0, "");
651
652void
653shutdown_kproc(void *arg, int howto)
654{
bc6dffab 655 struct thread *td;
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656 struct proc *p;
657 int error;
658
659 if (panicstr)
660 return;
661
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662 td = (struct thread *)arg;
663 if ((p = td->td_proc) != NULL) {
664 printf("Waiting (max %d seconds) for system process `%s' to stop...",
665 kproc_shutdown_wait, p->p_comm);
666 } else {
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667 printf("Waiting (max %d seconds) for system thread %s to stop...",
668 kproc_shutdown_wait, td->td_comm);
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669 }
670 error = suspend_kproc(td, kproc_shutdown_wait * hz);
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671
672 if (error == EWOULDBLOCK)
673 printf("timed out\n");
674 else
675 printf("stopped\n");
676}