kern_shutdown.c revision 55539
117658Sjulian/*- 217658Sjulian * Copyright (c) 1986, 1988, 1991, 1993 317658Sjulian * The Regents of the University of California. All rights reserved. 417658Sjulian * (c) UNIX System Laboratories, Inc. 517658Sjulian * All or some portions of this file are derived from material licensed 617658Sjulian * to the University of California by American Telephone and Telegraph 717658Sjulian * Co. or Unix System Laboratories, Inc. and are reproduced herein with 817658Sjulian * the permission of UNIX System Laboratories, Inc. 917658Sjulian * 1017658Sjulian * Redistribution and use in source and binary forms, with or without 1117658Sjulian * modification, are permitted provided that the following conditions 1217658Sjulian * are met: 1317658Sjulian * 1. Redistributions of source code must retain the above copyright 1417658Sjulian * notice, this list of conditions and the following disclaimer. 1517658Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1617658Sjulian * notice, this list of conditions and the following disclaimer in the 1717658Sjulian * documentation and/or other materials provided with the distribution. 1817658Sjulian * 3. All advertising materials mentioning features or use of this software 1917658Sjulian * must display the following acknowledgement: 2017658Sjulian * This product includes software developed by the University of 2117658Sjulian * California, Berkeley and its contributors. 2217658Sjulian * 4. Neither the name of the University nor the names of its contributors 2317658Sjulian * may be used to endorse or promote products derived from this software 2417658Sjulian * without specific prior written permission. 2517658Sjulian * 2617658Sjulian * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2717658Sjulian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2817658Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2917658Sjulian * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3017658Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3117658Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3217658Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3317658Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3417658Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3517658Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3617658Sjulian * SUCH DAMAGE. 3717658Sjulian * 3817658Sjulian * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 3950477Speter * $FreeBSD: head/sys/kern/kern_shutdown.c 55539 2000-01-07 08:36:44Z luoqi $ 4017658Sjulian */ 4117658Sjulian 4217658Sjulian#include "opt_ddb.h" 4333445Seivind#include "opt_hw_wdog.h" 4428976Sbde#include "opt_panic.h" 4528976Sbde#include "opt_show_busybufs.h" 4617658Sjulian 4717658Sjulian#include <sys/param.h> 4817658Sjulian#include <sys/systm.h> 4950107Smsmith#include <sys/eventhandler.h> 5031275Sbde#include <sys/buf.h> 5117658Sjulian#include <sys/reboot.h> 5217658Sjulian#include <sys/proc.h> 5341137Smsmith#include <sys/vnode.h> 5417658Sjulian#include <sys/kernel.h> 5555539Sluoqi#include <sys/kthread.h> 5621776Sbde#include <sys/mount.h> 5739237Sgibbs#include <sys/queue.h> 5817658Sjulian#include <sys/sysctl.h> 5917658Sjulian#include <sys/conf.h> 6017658Sjulian#include <sys/sysproto.h> 6149558Sphk#include <sys/cons.h> 6217658Sjulian 6317658Sjulian#include <machine/pcb.h> 6417658Sjulian#include <machine/clock.h> 6517658Sjulian#include <machine/md_var.h> 6626812Speter#ifdef SMP 6726812Speter#include <machine/smp.h> /* smp_active, cpuid */ 6826812Speter#endif 6917658Sjulian 7017658Sjulian#include <sys/signalvar.h> 7117658Sjulian 7217658Sjulian#ifndef PANIC_REBOOT_WAIT_TIME 7317658Sjulian#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 7417658Sjulian#endif 7517658Sjulian 7617658Sjulian/* 7717658Sjulian * Note that stdarg.h and the ANSI style va_start macro is used for both 7817658Sjulian * ANSI and traditional C compilers. 7917658Sjulian */ 8017658Sjulian#include <machine/stdarg.h> 8117658Sjulian 8228769Sbde#ifdef DDB 8317658Sjulian#ifdef DDB_UNATTENDED 8442135Smsmithint debugger_on_panic = 0; 8517658Sjulian#else 8642135Smsmithint debugger_on_panic = 1; 8717658Sjulian#endif 8817658SjulianSYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 8946381Sbillf &debugger_on_panic, 0, "Run debugger on kernel panic"); 9017658Sjulian#endif 9117658Sjulian 9243436SmsmithSYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 9343436Smsmith 9428000Sjulian#ifdef HW_WDOG 9517658Sjulian/* 9627997Sjulian * If there is a hardware watchdog, point this at the function needed to 9727997Sjulian * hold it off. 9827997Sjulian * It's needed when the kernel needs to do some lengthy operations. 9927997Sjulian * e.g. in wd.c when dumping core.. It's most annoying to have 10027997Sjulian * your precious core-dump only half written because the wdog kicked in. 10127997Sjulian */ 10227997Sjulianwatchdog_tickle_fn wdog_tickler = NULL; 10328000Sjulian#endif /* HW_WDOG */ 10427997Sjulian 10527997Sjulian/* 10617658Sjulian * Variable panicstr contains argument to first call to panic; used as flag 10717658Sjulian * to indicate that the kernel has already called panic. 10817658Sjulian */ 10917658Sjulianconst char *panicstr; 11017658Sjulian 11131275Sbdestatic void boot __P((int)) __dead2; 11231275Sbdestatic void dumpsys __P((void)); 11348868Sphkstatic int setdumpdev __P((dev_t dev)); 11450107Smsmithstatic void poweroff_wait __P((void *, int)); 11554233Sphkstatic void print_uptime __P((void)); 11650107Smsmithstatic void shutdown_halt __P((void *junk, int howto)); 11750107Smsmithstatic void shutdown_panic __P((void *junk, int howto)); 11850107Smsmithstatic void shutdown_reset __P((void *junk, int howto)); 11917658Sjulian 12050107Smsmith/* register various local shutdown events */ 12150107Smsmithstatic void 12250107Smsmithshutdown_conf(void *unused) 12350107Smsmith{ 12450107Smsmith EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 12550107Smsmith EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 12650107Smsmith EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 12750107Smsmith EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 12850107Smsmith} 12948868Sphk 13050107SmsmithSYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 13150107Smsmith 13217658Sjulian/* ARGSUSED */ 13317658Sjulian 13417658Sjulian/* 13517658Sjulian * The system call that results in a reboot 13617658Sjulian */ 13717658Sjulianint 13830994Sphkreboot(p, uap) 13917658Sjulian struct proc *p; 14017658Sjulian struct reboot_args *uap; 14117658Sjulian{ 14217658Sjulian int error; 14317658Sjulian 14446112Sphk if ((error = suser(p))) 14517658Sjulian return (error); 14617658Sjulian 14717658Sjulian boot(uap->opt); 14817658Sjulian return (0); 14917658Sjulian} 15017658Sjulian 15117658Sjulian/* 15217658Sjulian * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 15317658Sjulian */ 15417658Sjulianvoid 15528769Sbdeshutdown_nice() 15617658Sjulian{ 15717658Sjulian /* Send a signal to init(8) and have it shutdown the world */ 15817658Sjulian if (initproc != NULL) { 15917658Sjulian psignal(initproc, SIGINT); 16017658Sjulian } else { 16117658Sjulian /* No init(8) running, so simply reboot */ 16217658Sjulian boot(RB_NOSYNC); 16317658Sjulian } 16417658Sjulian return; 16517658Sjulian} 16617658Sjulianstatic int waittime = -1; 16717658Sjulianstatic struct pcb dumppcb; 16817658Sjulian 16954233Sphkstatic void 17054233Sphkprint_uptime() 17154233Sphk{ 17254233Sphk int f; 17354233Sphk struct timespec ts; 17454233Sphk 17554233Sphk getnanouptime(&ts); 17654233Sphk printf("Uptime: "); 17754233Sphk f = 0; 17854233Sphk if (ts.tv_sec >= 86400) { 17954233Sphk printf("%ldd", ts.tv_sec / 86400); 18054233Sphk ts.tv_sec %= 86400; 18154233Sphk f = 1; 18254233Sphk } 18354233Sphk if (f || ts.tv_sec >= 3600) { 18454233Sphk printf("%ldh", ts.tv_sec / 3600); 18554233Sphk ts.tv_sec %= 3600; 18654233Sphk f = 1; 18754233Sphk } 18854233Sphk if (f || ts.tv_sec >= 60) { 18954233Sphk printf("%ldm", ts.tv_sec / 60); 19054233Sphk ts.tv_sec %= 60; 19154233Sphk f = 1; 19254233Sphk } 19354233Sphk printf("%lds\n", ts.tv_sec); 19454233Sphk} 19554233Sphk 19617658Sjulian/* 19717658Sjulian * Go through the rigmarole of shutting down.. 19817658Sjulian * this used to be in machdep.c but I'll be dammned if I could see 19917658Sjulian * anything machine dependant in it. 20017658Sjulian */ 20131275Sbdestatic void 20217658Sjulianboot(howto) 20317658Sjulian int howto; 20417658Sjulian{ 20517658Sjulian 20625164Speter#ifdef SMP 20725164Speter if (smp_active) { 20826812Speter printf("boot() called on cpu#%d\n", cpuid); 20925164Speter } 21025164Speter#endif 21127997Sjulian /* 21227997Sjulian * Do any callouts that should be done BEFORE syncing the filesystems. 21327997Sjulian */ 21450107Smsmith EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 21527997Sjulian 21627997Sjulian /* 21727997Sjulian * Now sync filesystems 21827997Sjulian */ 21917658Sjulian if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 22017658Sjulian register struct buf *bp; 22117658Sjulian int iter, nbusy; 22217658Sjulian 22317658Sjulian waittime = 0; 22417658Sjulian printf("\nsyncing disks... "); 22517658Sjulian 22630994Sphk sync(&proc0, NULL); 22717658Sjulian 22834266Sjulian /* 22934266Sjulian * With soft updates, some buffers that are 23034266Sjulian * written will be remarked as dirty until other 23134266Sjulian * buffers are written. 23234266Sjulian */ 23317658Sjulian for (iter = 0; iter < 20; iter++) { 23417658Sjulian nbusy = 0; 23517658Sjulian for (bp = &buf[nbuf]; --bp >= buf; ) { 23648225Smckusick if ((bp->b_flags & B_INVAL) == 0 && 23748225Smckusick BUF_REFCNT(bp) > 0) { 23817658Sjulian nbusy++; 23934266Sjulian } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 24034266Sjulian == B_DELWRI) { 24134266Sjulian /* bawrite(bp);*/ 24234266Sjulian nbusy++; 24317658Sjulian } 24417658Sjulian } 24517658Sjulian if (nbusy == 0) 24617658Sjulian break; 24717658Sjulian printf("%d ", nbusy); 24834266Sjulian sync(&proc0, NULL); 24934266Sjulian DELAY(50000 * iter); 25017658Sjulian } 25153023Sphk printf("\n"); 25241137Smsmith /* 25341137Smsmith * Count only busy local buffers to prevent forcing 25441137Smsmith * a fsck if we're just a client of a wedged NFS server 25541137Smsmith */ 25641137Smsmith nbusy = 0; 25741137Smsmith for (bp = &buf[nbuf]; --bp >= buf; ) { 25848225Smckusick if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 25948225Smckusick ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 26053023Sphk if (bp->b_dev == NODEV) { 26153452Sphk TAILQ_REMOVE(&mountlist, 26248225Smckusick bp->b_vp->v_mount, mnt_list); 26353023Sphk continue; 26453023Sphk } 26553023Sphk nbusy++; 26653023Sphk#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 26753023Sphk printf( 26853023Sphk "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 26953023Sphk nbusy, devtoname(bp->b_dev), 27053023Sphk bp->b_flags, (long)bp->b_blkno, 27153023Sphk (long)bp->b_lblkno); 27253023Sphk#endif 27346568Speter } 27441137Smsmith } 27517658Sjulian if (nbusy) { 27617658Sjulian /* 27717658Sjulian * Failed to sync all blocks. Indicate this and don't 27817658Sjulian * unmount filesystems (thus forcing an fsck on reboot). 27917658Sjulian */ 28053023Sphk printf("giving up on %d buffers\n", nbusy); 28117658Sjulian DELAY(5000000); /* 5 seconds */ 28217658Sjulian } else { 28317658Sjulian printf("done\n"); 28417658Sjulian /* 28517658Sjulian * Unmount filesystems 28617658Sjulian */ 28717658Sjulian if (panicstr == 0) 28817658Sjulian vfs_unmountall(); 28917658Sjulian } 29039237Sgibbs DELAY(100000); /* wait for console output to finish */ 29117658Sjulian } 29227997Sjulian 29354233Sphk print_uptime(); 29454233Sphk 29527997Sjulian /* 29627997Sjulian * Ok, now do things that assume all filesystem activity has 29727997Sjulian * been completed. 29827997Sjulian */ 29950107Smsmith EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 30039237Sgibbs splhigh(); 30139522Sdt if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) { 30239237Sgibbs savectx(&dumppcb); 30339237Sgibbs#ifdef __i386__ 30439237Sgibbs dumppcb.pcb_cr3 = rcr3(); 30539237Sgibbs#endif 30639237Sgibbs dumpsys(); 30717768Sjulian } 30839237Sgibbs 30939237Sgibbs /* Now that we're going to really halt the system... */ 31050107Smsmith EVENTHANDLER_INVOKE(shutdown_final, howto); 31139237Sgibbs 31250107Smsmith for(;;) ; /* safety against shutdown_reset not working */ 31350107Smsmith /* NOTREACHED */ 31450107Smsmith} 31550107Smsmith 31650107Smsmith/* 31750107Smsmith * If the shutdown was a clean halt, behave accordingly. 31850107Smsmith */ 31950107Smsmithstatic void 32050107Smsmithshutdown_halt(void *junk, int howto) 32150107Smsmith{ 32217658Sjulian if (howto & RB_HALT) { 32317658Sjulian printf("\n"); 32417658Sjulian printf("The operating system has halted.\n"); 32517658Sjulian printf("Please press any key to reboot.\n\n"); 32619274Sjulian switch (cngetc()) { 32719274Sjulian case -1: /* No console, just die */ 32819274Sjulian cpu_halt(); 32919274Sjulian /* NOTREACHED */ 33019274Sjulian default: 33139237Sgibbs howto &= ~RB_HALT; 33219274Sjulian break; 33319274Sjulian } 33450107Smsmith } 33550107Smsmith} 33617658Sjulian 33750107Smsmith/* 33850107Smsmith * Check to see if the system paniced, pause and then reboot 33950107Smsmith * according to the specified delay. 34050107Smsmith */ 34150107Smsmithstatic void 34250107Smsmithshutdown_panic(void *junk, int howto) 34350107Smsmith{ 34450107Smsmith int loop; 34550107Smsmith 34650107Smsmith if (howto & RB_DUMP) { 34739237Sgibbs if (PANIC_REBOOT_WAIT_TIME != 0) { 34839237Sgibbs if (PANIC_REBOOT_WAIT_TIME != -1) { 34939237Sgibbs printf("Automatic reboot in %d seconds - " 35039237Sgibbs "press a key on the console to abort\n", 35139237Sgibbs PANIC_REBOOT_WAIT_TIME); 35239237Sgibbs for (loop = PANIC_REBOOT_WAIT_TIME * 10; 35339237Sgibbs loop > 0; --loop) { 35439237Sgibbs DELAY(1000 * 100); /* 1/10th second */ 35539237Sgibbs /* Did user type a key? */ 35639237Sgibbs if (cncheckc() != -1) 35739237Sgibbs break; 35817658Sjulian } 35939237Sgibbs if (!loop) 36050107Smsmith return; 36117658Sjulian } 36239237Sgibbs } else { /* zero time specified - reboot NOW */ 36350107Smsmith return; 36417658Sjulian } 36539237Sgibbs printf("--> Press a key on the console to reboot <--\n"); 36639237Sgibbs cngetc(); 36717658Sjulian } 36850107Smsmith} 36950107Smsmith 37050107Smsmith/* 37150107Smsmith * Everything done, now reset 37250107Smsmith */ 37350107Smsmithstatic void 37450107Smsmithshutdown_reset(void *junk, int howto) 37550107Smsmith{ 37617658Sjulian printf("Rebooting...\n"); 37717658Sjulian DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 37817677Sjulian /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 37917658Sjulian cpu_reset(); 38050107Smsmith /* NOTREACHED */ /* assuming reset worked */ 38117658Sjulian} 38217658Sjulian 38317658Sjulian/* 38417658Sjulian * Magic number for savecore 38517658Sjulian * 38617658Sjulian * exported (symorder) and used at least by savecore(8) 38717658Sjulian * 38817658Sjulian */ 38917658Sjulianstatic u_long const dumpmag = 0x8fca0101UL; 39017658Sjulian 39117658Sjulianstatic int dumpsize = 0; /* also for savecore */ 39217658Sjulian 39317658Sjulianstatic int dodump = 1; 39417658Sjulian 39548868SphkSYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 39648868Sphk "Try to perform coredump on kernel panic"); 39748868Sphk 39848868Sphkstatic int 39948868Sphksetdumpdev(dev) 40048868Sphk dev_t dev; 40148868Sphk{ 40250571Sphk int psize; 40348868Sphk long newdumplo; 40448868Sphk 40548868Sphk if (dev == NODEV) { 40648868Sphk dumpdev = dev; 40748868Sphk return (0); 40848868Sphk } 40949679Sphk if (devsw(dev) == NULL) 41048868Sphk return (ENXIO); /* XXX is this right? */ 41149679Sphk if (devsw(dev)->d_psize == NULL) 41248868Sphk return (ENXIO); /* XXX should be ENODEV ? */ 41349679Sphk psize = devsw(dev)->d_psize(dev); 41448868Sphk if (psize == -1) 41548868Sphk return (ENXIO); /* XXX should be ENODEV ? */ 41648868Sphk /* 41750571Sphk * XXX should clean up checking in dumpsys() to be more like this. 41848868Sphk */ 41948868Sphk newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE; 42048868Sphk if (newdumplo < 0) 42148868Sphk return (ENOSPC); 42248868Sphk dumpdev = dev; 42348868Sphk dumplo = newdumplo; 42448868Sphk return (0); 42548868Sphk} 42648868Sphk 42748868Sphk 42831403Sjulian/* ARGSUSED */ 42931403Sjulianstatic void dump_conf __P((void *dummy)); 43031403Sjulianstatic void 43131403Sjuliandump_conf(dummy) 43231403Sjulian void *dummy; 43331403Sjulian{ 43448868Sphk if (setdumpdev(dumpdev) != 0) 43548868Sphk dumpdev = NODEV; 43631403Sjulian} 43748868Sphk 43831403SjulianSYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 43931403Sjulian 44048868Sphkstatic int 44148868Sphksysctl_kern_dumpdev SYSCTL_HANDLER_ARGS 44248868Sphk{ 44348868Sphk int error; 44448868Sphk udev_t ndumpdev; 44548868Sphk 44653838Sphk ndumpdev = dev2udev(dumpdev); 44748868Sphk error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 44848868Sphk if (error == 0 && req->newptr != NULL) 44953838Sphk error = setdumpdev(udev2dev(ndumpdev, 0)); 45048868Sphk return (error); 45148868Sphk} 45248868Sphk 45348868SphkSYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 45448868Sphk 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 45548868Sphk 45617658Sjulian/* 45717658Sjulian * Doadump comes here after turning off memory management and 45817658Sjulian * getting on the dump stack, either when called above, or by 45917658Sjulian * the auto-restart code. 46017658Sjulian */ 46117658Sjulianstatic void 46217658Sjuliandumpsys(void) 46317658Sjulian{ 46449627Salfred int error; 46550571Sphk static int dumping; 46617658Sjulian 46750571Sphk if (dumping++) { 46850571Sphk printf("Dump already in progress, bailing...\n"); 46950571Sphk return; 47050571Sphk } 47117658Sjulian if (!dodump) 47217658Sjulian return; 47317658Sjulian if (dumpdev == NODEV) 47417658Sjulian return; 47549679Sphk if (!(devsw(dumpdev))) 47617658Sjulian return; 47749679Sphk if (!(devsw(dumpdev)->d_dump)) 47817658Sjulian return; 47917658Sjulian dumpsize = Maxmem; 48050571Sphk printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 48117658Sjulian printf("dump "); 48249679Sphk error = (*devsw(dumpdev)->d_dump)(dumpdev); 48349627Salfred if (error == 0) { 48449627Salfred printf("succeeded\n"); 48549627Salfred return; 48649627Salfred } 48749627Salfred printf("failed, reason: "); 48849627Salfred switch (error) { 48949627Salfred case ENODEV: 49049627Salfred printf("device doesn't support a dump routine\n"); 49149627Salfred break; 49217658Sjulian 49317658Sjulian case ENXIO: 49417658Sjulian printf("device bad\n"); 49517658Sjulian break; 49617658Sjulian 49717658Sjulian case EFAULT: 49817658Sjulian printf("device not ready\n"); 49917658Sjulian break; 50017658Sjulian 50117658Sjulian case EINVAL: 50217658Sjulian printf("area improper\n"); 50317658Sjulian break; 50417658Sjulian 50517658Sjulian case EIO: 50617658Sjulian printf("i/o error\n"); 50717658Sjulian break; 50817658Sjulian 50917658Sjulian case EINTR: 51017658Sjulian printf("aborted from console\n"); 51117658Sjulian break; 51217658Sjulian 51317658Sjulian default: 51449627Salfred printf("unknown, error = %d\n", error); 51517658Sjulian break; 51617658Sjulian } 51717658Sjulian} 51817658Sjulian 51917658Sjulian/* 52017658Sjulian * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 52117658Sjulian * and then reboots. If we are called twice, then we avoid trying to sync 52217658Sjulian * the disks as this often leads to recursive panics. 52317658Sjulian */ 52417658Sjulianvoid 52517658Sjulianpanic(const char *fmt, ...) 52617658Sjulian{ 52717658Sjulian int bootopt; 52817658Sjulian va_list ap; 52938874Sache static char buf[256]; 53017658Sjulian 53117658Sjulian bootopt = RB_AUTOBOOT | RB_DUMP; 53217658Sjulian if (panicstr) 53317658Sjulian bootopt |= RB_NOSYNC; 53417658Sjulian else 53517658Sjulian panicstr = fmt; 53617658Sjulian 53717658Sjulian va_start(ap, fmt); 53841514Sarchie (void)vsnprintf(buf, sizeof(buf), fmt, ap); 53938874Sache if (panicstr == fmt) 54038874Sache panicstr = buf; 54117658Sjulian va_end(ap); 54238874Sache printf("panic: %s\n", buf); 54326100Sfsmp#ifdef SMP 54429128Speter /* three seperate prints in case of an unmapped page and trap */ 54529128Speter printf("mp_lock = %08x; ", mp_lock); 54629128Speter printf("cpuid = %d; ", cpuid); 54729128Speter printf("lapic.id = %08x\n", lapic.id); 54826100Sfsmp#endif 54917658Sjulian 55017658Sjulian#if defined(DDB) 55117658Sjulian if (debugger_on_panic) 55217658Sjulian Debugger ("panic"); 55317658Sjulian#endif 55417658Sjulian boot(bootopt); 55517658Sjulian} 55617658Sjulian 55717768Sjulian/* 55843436Smsmith * Support for poweroff delay. 55943436Smsmith */ 56054248Smsmith#ifndef POWEROFF_DELAY 56154248Smsmith# define POWEROFF_DELAY 5000 56254248Smsmith#endif 56354248Smsmithstatic int poweroff_delay = POWEROFF_DELAY; 56454248Smsmith 56543436SmsmithSYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 56643436Smsmith &poweroff_delay, 0, ""); 56743436Smsmith 56850107Smsmithstatic void 56950107Smsmithpoweroff_wait(void *junk, int howto) 57043436Smsmith{ 57143436Smsmith if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 57243436Smsmith return; 57343436Smsmith DELAY(poweroff_delay * 1000); 57443436Smsmith} 57555539Sluoqi 57655539Sluoqi/* 57755539Sluoqi * Some system processes (e.g. syncer) need to be stopped at appropriate 57855539Sluoqi * points in their main loops prior to a system shutdown, so that they 57955539Sluoqi * won't interfere with the shutdown process (e.g. by holding a disk buf 58055539Sluoqi * to cause sync to fail). For each of these system processes, register 58155539Sluoqi * shutdown_kproc() as a handler for one of shutdown events. 58255539Sluoqi */ 58355539Sluoqistatic int kproc_shutdown_wait = 60; 58455539SluoqiSYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 58555539Sluoqi &kproc_shutdown_wait, 0, ""); 58655539Sluoqi 58755539Sluoqivoid 58855539Sluoqishutdown_kproc(void *arg, int howto) 58955539Sluoqi{ 59055539Sluoqi struct proc *p; 59155539Sluoqi int error; 59255539Sluoqi 59355539Sluoqi if (panicstr) 59455539Sluoqi return; 59555539Sluoqi 59655539Sluoqi p = (struct proc *)arg; 59755539Sluoqi printf("Waiting (max %d seconds) for system process `%s' to stop...", 59855539Sluoqi kproc_shutdown_wait * hz, p->p_comm); 59955539Sluoqi error = suspend_kproc(p, kproc_shutdown_wait); 60055539Sluoqi 60155539Sluoqi if (error == EWOULDBLOCK) 60255539Sluoqi printf("timed out\n"); 60355539Sluoqi else 60455539Sluoqi printf("stopped\n"); 60555539Sluoqi} 606