Get rid of libcr, the idea(s) behind it are not really applicable anymore
[dragonfly.git] / sys / kern / kern_shutdown.c
CommitLineData
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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 $
54078292 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.27 2006/03/24 18:35:33 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>
9ec81f83 67#include <sys/thread2.h>
3020e3be 68#include <sys/buf2.h>
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69
70#include <machine/pcb.h>
71#include <machine/clock.h>
72#include <machine/md_var.h>
0f7a3396 73#include <machine/smp.h> /* smp_active_mask, cpuid */
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74
75#include <sys/signalvar.h>
76
77#ifndef PANIC_REBOOT_WAIT_TIME
78#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
79#endif
80
81/*
82 * Note that stdarg.h and the ANSI style va_start macro is used for both
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83 * ANSI and traditional C compilers. We use the machine version to stay
84 * within the confines of the kernel header files.
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85 */
86#include <machine/stdarg.h>
87
88#ifdef DDB
89#ifdef DDB_UNATTENDED
90int debugger_on_panic = 0;
91#else
92int debugger_on_panic = 1;
93#endif
94SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
95 &debugger_on_panic, 0, "Run debugger on kernel panic");
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96
97extern void db_print_backtrace(void);
98
99#ifdef DDB_TRACE
100int trace_on_panic = 1;
101#else
102int trace_on_panic = 0;
103#endif
104SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
105 &trace_on_panic, 0, "Print stack trace on kernel panic");
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106#endif
107
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108static int sync_on_panic = 1;
109SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
110 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
111
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112SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
113
114#ifdef HW_WDOG
115/*
116 * If there is a hardware watchdog, point this at the function needed to
117 * hold it off.
118 * It's needed when the kernel needs to do some lengthy operations.
119 * e.g. in wd.c when dumping core.. It's most annoying to have
120 * your precious core-dump only half written because the wdog kicked in.
121 */
122watchdog_tickle_fn wdog_tickler = NULL;
123#endif /* HW_WDOG */
124
125/*
126 * Variable panicstr contains argument to first call to panic; used as flag
127 * to indicate that the kernel has already called panic.
128 */
129const char *panicstr;
130
131int dumping; /* system is dumping */
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132#ifdef SMP
133u_int panic_cpu_interlock; /* panic interlock */
134globaldata_t panic_cpu_gd; /* which cpu took the panic */
135#endif
984263bc 136
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137static void boot (int) __dead2;
138static void dumpsys (void);
139static int setdumpdev (dev_t dev);
140static void poweroff_wait (void *, int);
141static void print_uptime (void);
142static void shutdown_halt (void *junk, int howto);
143static void shutdown_panic (void *junk, int howto);
144static void shutdown_reset (void *junk, int howto);
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145
146/* register various local shutdown events */
147static void
148shutdown_conf(void *unused)
149{
150 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
151 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
152 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
153 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
154}
155
156SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
157
158/* ARGSUSED */
159
160/*
161 * The system call that results in a reboot
162 */
163int
41c20dac 164reboot(struct reboot_args *uap)
984263bc 165{
dadab5e9 166 struct thread *td = curthread;
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167 int error;
168
dadab5e9 169 if ((error = suser(td)))
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170 return (error);
171
172 boot(uap->opt);
173 return (0);
174}
175
176/*
177 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
178 */
179static int shutdown_howto = 0;
180
181void
182shutdown_nice(int howto)
183{
184 shutdown_howto = howto;
185
186 /* Send a signal to init(8) and have it shutdown the world */
187 if (initproc != NULL) {
188 psignal(initproc, SIGINT);
189 } else {
190 /* No init(8) running, so simply reboot */
191 boot(RB_NOSYNC);
192 }
193 return;
194}
195static int waittime = -1;
8b6a428f 196static struct thread *dumpthread;
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197static struct pcb dumppcb;
198
199static void
200print_uptime()
201{
202 int f;
203 struct timespec ts;
204
205 getnanouptime(&ts);
206 printf("Uptime: ");
207 f = 0;
208 if (ts.tv_sec >= 86400) {
209 printf("%ldd", ts.tv_sec / 86400);
210 ts.tv_sec %= 86400;
211 f = 1;
212 }
213 if (f || ts.tv_sec >= 3600) {
214 printf("%ldh", ts.tv_sec / 3600);
215 ts.tv_sec %= 3600;
216 f = 1;
217 }
218 if (f || ts.tv_sec >= 60) {
219 printf("%ldm", ts.tv_sec / 60);
220 ts.tv_sec %= 60;
221 f = 1;
222 }
223 printf("%lds\n", ts.tv_sec);
224}
225
226/*
227 * Go through the rigmarole of shutting down..
228 * this used to be in machdep.c but I'll be dammned if I could see
229 * anything machine dependant in it.
230 */
231static void
41c20dac 232boot(int howto)
984263bc 233{
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234 /*
235 * Get rid of any user scheduler baggage and then give
236 * us a high priority.
237 */
238 if (curthread->td_release)
239 curthread->td_release(curthread);
240 lwkt_setpri_self(TDPRI_MAX);
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241
242 /* collect extra flags that shutdown_nice might have set */
243 howto |= shutdown_howto;
244
245#ifdef SMP
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246 /*
247 * We really want to shutdown on the BSP. Subsystems such as ACPI
248 * can't power-down the box otherwise.
249 */
0f7a3396 250 if (smp_active_mask > 1) {
72740893 251 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
984263bc 252 }
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253 if (panicstr == NULL && mycpu->gd_cpuid != 0) {
254 printf("Switching to cpu #0 for shutdown\n");
255 lwkt_setcpu_self(globaldata_find(0));
256 }
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257#endif
258 /*
259 * Do any callouts that should be done BEFORE syncing the filesystems.
260 */
261 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
262
263 /*
264 * Now sync filesystems
265 */
266 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
1fd87d54 267 struct buf *bp;
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268 int iter, nbusy, pbusy;
269
270 waittime = 0;
271 printf("\nsyncing disks... ");
272
41c20dac 273 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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274
275 /*
276 * With soft updates, some buffers that are
277 * written will be remarked as dirty until other
278 * buffers are written.
279 */
280 for (iter = pbusy = 0; iter < 20; iter++) {
281 nbusy = 0;
282 for (bp = &buf[nbuf]; --bp >= buf; ) {
283 if ((bp->b_flags & B_INVAL) == 0 &&
284 BUF_REFCNT(bp) > 0) {
285 nbusy++;
286 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
287 == B_DELWRI) {
288 /* bawrite(bp);*/
289 nbusy++;
290 }
291 }
292 if (nbusy == 0)
293 break;
294 printf("%d ", nbusy);
295 if (nbusy < pbusy)
296 iter = 0;
297 pbusy = nbusy;
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298 /*
299 * XXX:
300 * Process soft update work queue if buffers don't sync
301 * after 6 iterations by permitting the syncer to run.
302 */
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303 if (iter > 5 && bioops.io_sync)
304 (*bioops.io_sync)(NULL);
41c20dac 305 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
3ad8cc28 306 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
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307 }
308 printf("\n");
309 /*
310 * Count only busy local buffers to prevent forcing
311 * a fsck if we're just a client of a wedged NFS server
312 */
313 nbusy = 0;
314 for (bp = &buf[nbuf]; --bp >= buf; ) {
315 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
316 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
81b5c339 317 /*
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318 * Only count buffers undergoing write I/O
319 * on the related vnode.
81b5c339 320 */
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321 if (bp->b_vp == NULL ||
322 bp->b_vp->v_track_write.bk_active == 0) {
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323 continue;
324 }
325 nbusy++;
326#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
327 printf(
54078292 328 "%p %d: dev:?, flags:%08lx, loffset:%lld, doffset:%lld\n",
81b5c339 329 bp, nbusy,
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330 bp->b_flags, bp->b_loffset,
331 bp->b_bio2.bio_offset);
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332#endif
333 }
334 }
335 if (nbusy) {
336 /*
337 * Failed to sync all blocks. Indicate this and don't
338 * unmount filesystems (thus forcing an fsck on reboot).
339 */
340 printf("giving up on %d buffers\n", nbusy);
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341#ifdef DDB
342 Debugger("busy buffer problem");
343#endif /* DDB */
3ad8cc28 344 tsleep(boot, 0, "shutdn", hz * 5 + 1);
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345 } else {
346 printf("done\n");
347 /*
348 * Unmount filesystems
349 */
350 if (panicstr == 0)
351 vfs_unmountall();
352 }
3ad8cc28 353 tsleep(boot, 0, "shutdn", hz / 10 + 1);
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354 }
355
356 print_uptime();
357
358 /*
359 * Ok, now do things that assume all filesystem activity has
360 * been completed.
361 */
362 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
9ec81f83 363 crit_enter();
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364 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
365 dumpsys();
366
367 /* Now that we're going to really halt the system... */
368 EVENTHANDLER_INVOKE(shutdown_final, howto);
369
370 for(;;) ; /* safety against shutdown_reset not working */
371 /* NOTREACHED */
372}
373
374/*
375 * If the shutdown was a clean halt, behave accordingly.
376 */
377static void
378shutdown_halt(void *junk, int howto)
379{
380 if (howto & RB_HALT) {
381 printf("\n");
382 printf("The operating system has halted.\n");
383 printf("Please press any key to reboot.\n\n");
384 switch (cngetc()) {
385 case -1: /* No console, just die */
386 cpu_halt();
387 /* NOTREACHED */
388 default:
389 howto &= ~RB_HALT;
390 break;
391 }
392 }
393}
394
395/*
396 * Check to see if the system paniced, pause and then reboot
397 * according to the specified delay.
398 */
399static void
400shutdown_panic(void *junk, int howto)
401{
402 int loop;
403
404 if (howto & RB_DUMP) {
405 if (PANIC_REBOOT_WAIT_TIME != 0) {
406 if (PANIC_REBOOT_WAIT_TIME != -1) {
407 printf("Automatic reboot in %d seconds - "
408 "press a key on the console to abort\n",
409 PANIC_REBOOT_WAIT_TIME);
410 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
411 loop > 0; --loop) {
412 DELAY(1000 * 100); /* 1/10th second */
413 /* Did user type a key? */
414 if (cncheckc() != -1)
415 break;
416 }
417 if (!loop)
418 return;
419 }
420 } else { /* zero time specified - reboot NOW */
421 return;
422 }
423 printf("--> Press a key on the console to reboot,\n");
424 printf("--> or switch off the system now.\n");
425 cngetc();
426 }
427}
428
429/*
430 * Everything done, now reset
431 */
432static void
433shutdown_reset(void *junk, int howto)
434{
435 printf("Rebooting...\n");
436 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
437 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
438 cpu_reset();
439 /* NOTREACHED */ /* assuming reset worked */
440}
441
442/*
443 * Magic number for savecore
444 *
445 * exported (symorder) and used at least by savecore(8)
446 *
447 */
448static u_long const dumpmag = 0x8fca0101UL;
449
450static int dumpsize = 0; /* also for savecore */
451
452static int dodump = 1;
453
454SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
455 "Try to perform coredump on kernel panic");
456
457static int
458setdumpdev(dev)
459 dev_t dev;
460{
461 int psize;
462 long newdumplo;
463
464 if (dev == NODEV) {
465 dumpdev = dev;
466 return (0);
467 }
335dda38 468 psize = dev_dpsize(dev);
984263bc 469 if (psize == -1)
335dda38 470 return (ENXIO);
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471 /*
472 * XXX should clean up checking in dumpsys() to be more like this.
473 */
474 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
475 if (newdumplo <= LABELSECTOR)
476 return (ENOSPC);
477 dumpdev = dev;
478 dumplo = newdumplo;
479 return (0);
480}
481
482
483/* ARGSUSED */
402ed7e1 484static void dump_conf (void *dummy);
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485static void
486dump_conf(dummy)
487 void *dummy;
488{
489 char *path;
490 dev_t dev;
491
492 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
493 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
494 dev = getdiskbyname(path);
495 if (dev != NODEV)
496 dumpdev = dev;
497 }
498 free(path, M_TEMP);
499 if (setdumpdev(dumpdev) != 0)
500 dumpdev = NODEV;
501}
502
503SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
504
505static int
506sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
507{
508 int error;
509 udev_t ndumpdev;
510
511 ndumpdev = dev2udev(dumpdev);
512 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
513 if (error == 0 && req->newptr != NULL)
514 error = setdumpdev(udev2dev(ndumpdev, 0));
515 return (error);
516}
517
518SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
519 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
520
521/*
522 * Doadump comes here after turning off memory management and
523 * getting on the dump stack, either when called above, or by
524 * the auto-restart code.
525 */
526static void
527dumpsys(void)
528{
529 int error;
530
531 savectx(&dumppcb);
8b6a428f 532 dumpthread = curthread;
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533 if (dumping++) {
534 printf("Dump already in progress, bailing...\n");
535 return;
536 }
537 if (!dodump)
538 return;
539 if (dumpdev == NODEV)
540 return;
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541 dumpsize = Maxmem;
542 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
543 printf("dump ");
335dda38 544 error = dev_ddump(dumpdev);
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545 if (error == 0) {
546 printf("succeeded\n");
547 return;
548 }
549 printf("failed, reason: ");
550 switch (error) {
335dda38 551 case ENOSYS:
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552 case ENODEV:
553 printf("device doesn't support a dump routine\n");
554 break;
555
556 case ENXIO:
557 printf("device bad\n");
558 break;
559
560 case EFAULT:
561 printf("device not ready\n");
562 break;
563
564 case EINVAL:
565 printf("area improper\n");
566 break;
567
568 case EIO:
569 printf("i/o error\n");
570 break;
571
572 case EINTR:
573 printf("aborted from console\n");
574 break;
575
576 default:
577 printf("unknown, error = %d\n", error);
578 break;
579 }
580}
581
582int
583dumpstatus(vm_offset_t addr, off_t count)
584{
585 int c;
586
587 if (addr % (1024 * 1024) == 0) {
588#ifdef HW_WDOG
589 if (wdog_tickler)
590 (*wdog_tickler)();
591#endif
592 printf("%ld ", (long)(count / (1024 * 1024)));
593 }
594
595 if ((c = cncheckc()) == 0x03)
596 return -1;
597 else if (c != -1)
598 printf("[CTRL-C to abort] ");
599
600 return 0;
601}
602
603/*
604 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
605 * and then reboots. If we are called twice, then we avoid trying to sync
606 * the disks as this often leads to recursive panics.
607 */
608void
609panic(const char *fmt, ...)
610{
b1e04573 611 int bootopt, newpanic;
e2565a42 612 __va_list ap;
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613 static char buf[256];
614
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615#ifdef SMP
616 /*
617 * If a panic occurs on multiple cpus before the first is able to
618 * halt the other cpus, only one cpu is allowed to take the panic.
619 * Attempt to be verbose about this situation but if the printf()
620 * itself panics don't let us overrun the kernel stack.
621 *
622 * Be very nasty about descheduling our thread at the lowest
623 * level possible in an attempt to freeze the thread without
624 * inducing further panics.
625 *
626 * Bumping gd_trap_nesting_level will also bypass assertions in
627 * lwkt_switch() and allow us to switch away even if we are a
628 * FAST interrupt or IPI.
629 */
630 if (atomic_poll_acquire_int(&panic_cpu_interlock)) {
631 panic_cpu_gd = mycpu;
632 } else if (panic_cpu_gd != mycpu) {
633 crit_enter();
634 ++mycpu->gd_trap_nesting_level;
635 if (mycpu->gd_trap_nesting_level < 25) {
636 printf("SECONDARY PANIC ON CPU %d THREAD %p\n",
637 mycpu->gd_cpuid, curthread);
638 }
639 curthread->td_release = NULL; /* be a grinch */
640 for (;;) {
641 lwkt_deschedule_self(curthread);
642 lwkt_switch();
643 }
644 /* NOT REACHED */
645 /* --mycpu->gd_trap_nesting_level */
646 /* crit_exit() */
647 }
648#endif
984263bc 649 bootopt = RB_AUTOBOOT | RB_DUMP;
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650 if (sync_on_panic == 0)
651 bootopt |= RB_NOSYNC;
b1e04573 652 newpanic = 0;
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653 if (panicstr)
654 bootopt |= RB_NOSYNC;
b1e04573 655 else {
984263bc 656 panicstr = fmt;
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657 newpanic = 1;
658 }
984263bc 659
e2565a42 660 __va_start(ap, fmt);
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661 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
662 if (panicstr == fmt)
663 panicstr = buf;
e2565a42 664 __va_end(ap);
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665 printf("panic: %s\n", buf);
666#ifdef SMP
7a44d1cb 667 /* three separate prints in case of an unmapped page and trap */
984263bc 668 printf("mp_lock = %08x; ", mp_lock);
72740893 669 printf("cpuid = %d; ", mycpu->gd_cpuid);
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670 printf("lapic.id = %08x\n", lapic.id);
671#endif
672
673#if defined(DDB)
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674 if (newpanic && trace_on_panic)
675 db_print_backtrace();
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676 if (debugger_on_panic)
677 Debugger ("panic");
678#endif
679 boot(bootopt);
680}
681
682/*
683 * Support for poweroff delay.
684 */
685#ifndef POWEROFF_DELAY
686# define POWEROFF_DELAY 5000
687#endif
688static int poweroff_delay = POWEROFF_DELAY;
689
690SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
691 &poweroff_delay, 0, "");
692
693static void
694poweroff_wait(void *junk, int howto)
695{
696 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
697 return;
698 DELAY(poweroff_delay * 1000);
699}
700
701/*
702 * Some system processes (e.g. syncer) need to be stopped at appropriate
703 * points in their main loops prior to a system shutdown, so that they
704 * won't interfere with the shutdown process (e.g. by holding a disk buf
705 * to cause sync to fail). For each of these system processes, register
706 * shutdown_kproc() as a handler for one of shutdown events.
707 */
708static int kproc_shutdown_wait = 60;
709SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
710 &kproc_shutdown_wait, 0, "");
711
712void
713shutdown_kproc(void *arg, int howto)
714{
bc6dffab 715 struct thread *td;
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716 struct proc *p;
717 int error;
718
719 if (panicstr)
720 return;
721
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722 td = (struct thread *)arg;
723 if ((p = td->td_proc) != NULL) {
724 printf("Waiting (max %d seconds) for system process `%s' to stop...",
725 kproc_shutdown_wait, p->p_comm);
726 } else {
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727 printf("Waiting (max %d seconds) for system thread %s to stop...",
728 kproc_shutdown_wait, td->td_comm);
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729 }
730 error = suspend_kproc(td, kproc_shutdown_wait * hz);
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731
732 if (error == EWOULDBLOCK)
733 printf("timed out\n");
734 else
735 printf("stopped\n");
736}