kern_shutdown.c revision 150472
119304Speter/*- 219304Speter * Copyright (c) 1986, 1988, 1991, 1993 319304Speter * The Regents of the University of California. All rights reserved. 419304Speter * (c) UNIX System Laboratories, Inc. 519304Speter * All or some portions of this file are derived from material licensed 619304Speter * to the University of California by American Telephone and Telegraph 719304Speter * Co. or Unix System Laboratories, Inc. and are reproduced herein with 819304Speter * the permission of UNIX System Laboratories, Inc. 919304Speter * 1019304Speter * Redistribution and use in source and binary forms, with or without 1119304Speter * modification, are permitted provided that the following conditions 1219304Speter * are met: 13254225Speter * 1. Redistributions of source code must retain the above copyright 1419304Speter * notice, this list of conditions and the following disclaimer. 1519304Speter * 2. Redistributions in binary form must reproduce the above copyright 1619304Speter * notice, this list of conditions and the following disclaimer in the 1719304Speter * documentation and/or other materials provided with the distribution. 1819304Speter * 4. Neither the name of the University nor the names of its contributors 1919304Speter * may be used to endorse or promote products derived from this software 2019304Speter * without specific prior written permission. 2119304Speter * 2219304Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2319304Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2419304Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2519304Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2619304Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2719304Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2819304Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2919304Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3019304Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3119304Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3219304Speter * SUCH DAMAGE. 3319304Speter * 3419304Speter * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 3519304Speter */ 3619304Speter 3719304Speter#include <sys/cdefs.h> 3819304Speter__FBSDID("$FreeBSD: head/sys/kern/kern_shutdown.c 150472 2005-09-22 15:34:15Z ups $"); 3919304Speter 4019304Speter#include "opt_kdb.h" 4119304Speter#include "opt_mac.h" 4219304Speter#include "opt_panic.h" 4319304Speter#include "opt_show_busybufs.h" 4419304Speter#include "opt_sched.h" 4519304Speter 4619304Speter#include <sys/param.h> 4719304Speter#include <sys/systm.h> 4819304Speter#include <sys/bio.h> 4919304Speter#include <sys/buf.h> 5019304Speter#include <sys/conf.h> 5119304Speter#include <sys/cons.h> 5219304Speter#include <sys/eventhandler.h> 5319304Speter#include <sys/kdb.h> 5419304Speter#include <sys/kernel.h> 5519304Speter#include <sys/kthread.h> 5619304Speter#include <sys/mac.h> 5719304Speter#include <sys/malloc.h> 5819304Speter#include <sys/mount.h> 5919304Speter#include <sys/proc.h> 6019304Speter#include <sys/reboot.h> 6119304Speter#include <sys/resourcevar.h> 6219304Speter#include <sys/sched.h> 6319304Speter#include <sys/smp.h> /* smp_active */ 6419304Speter#include <sys/sysctl.h> 6519304Speter#include <sys/sysproto.h> 6619304Speter 6719304Speter#include <machine/cpu.h> 6819304Speter#include <machine/pcb.h> 6919304Speter#include <machine/smp.h> 7019304Speter 7119304Speter#include <sys/signalvar.h> 7219304Speter 7319304Speter#ifndef PANIC_REBOOT_WAIT_TIME 7419304Speter#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 7519304Speter#endif 7619304Speter 7719304Speter/* 7819304Speter * Note that stdarg.h and the ANSI style va_start macro is used for both 7919304Speter * ANSI and traditional C compilers. 80254225Speter */ 8119304Speter#include <machine/stdarg.h> 8219304Speter 8319304Speter#ifdef KDB 8419304Speter#ifdef KDB_UNATTENDED 8519304Speterint debugger_on_panic = 0; 8619304Speter#else 8719304Speterint debugger_on_panic = 1; 8819304Speter#endif 8919304SpeterSYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 9019304Speter &debugger_on_panic, 0, "Run debugger on kernel panic"); 9119304Speter 92254225Speter#ifdef KDB_TRACE 9319304Speterint trace_on_panic = 1; 9419304Speter#else 9519304Speterint trace_on_panic = 0; 9619304Speter#endif 9719304SpeterSYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 9819304Speter &trace_on_panic, 0, "Print stack trace on kernel panic"); 9919304Speter#endif /* KDB */ 10019304Speter 10119304Speterint sync_on_panic = 0; 102254225SpeterSYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 10319304Speter &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 10419304Speter 10519304SpeterSYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 10619304Speter 10719304Speter/* 10819304Speter * Variable panicstr contains argument to first call to panic; used as flag 10919304Speter * to indicate that the kernel has already called panic. 11019304Speter */ 11119304Speterconst char *panicstr; 11219304Speter 11319304Speterint dumping; /* system is dumping */ 11419304Speterstatic struct dumperinfo dumper; /* our selected dumper */ 11519304Speter 11619304Speter/* Context information for dump-debuggers. */ 11719304Speterstatic struct pcb dumppcb; /* Registers. */ 11819304Speterstatic lwpid_t dumptid; /* Thread ID. */ 11919304Speter 12019304Speterstatic void boot(int) __dead2; 121254225Speterstatic void poweroff_wait(void *, int); 12219304Speterstatic void shutdown_halt(void *junk, int howto); 12319304Speterstatic void shutdown_panic(void *junk, int howto); 12419304Speterstatic void shutdown_reset(void *junk, int howto); 12519304Speter 12619304Speter/* register various local shutdown events */ 12719304Speterstatic void 12819304Spetershutdown_conf(void *unused) 12919304Speter{ 13019304Speter 13119304Speter EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 13219304Speter SHUTDOWN_PRI_FIRST); 13319304Speter EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 13419304Speter SHUTDOWN_PRI_LAST + 100); 13519304Speter EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 13619304Speter SHUTDOWN_PRI_LAST + 100); 13719304Speter EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 13819304Speter SHUTDOWN_PRI_LAST + 200); 13919304Speter} 14019304Speter 14119304SpeterSYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 14219304Speter 14319304Speter/* 14419304Speter * The system call that results in a reboot 14519304Speter * 14619304Speter * MPSAFE 14719304Speter */ 14819304Speter/* ARGSUSED */ 149254225Speterint 15019304Speterreboot(struct thread *td, struct reboot_args *uap) 15119304Speter{ 15219304Speter int error; 15319304Speter 15419304Speter error = 0; 15519304Speter#ifdef MAC 15619304Speter error = mac_check_system_reboot(td->td_ucred, uap->opt); 15719304Speter#endif 15819304Speter if (error == 0) 15919304Speter error = suser(td); 16019304Speter if (error == 0) { 16119304Speter mtx_lock(&Giant); 16219304Speter boot(uap->opt); 16319304Speter mtx_unlock(&Giant); 16419304Speter } 16519304Speter return (error); 16619304Speter} 16719304Speter 16819304Speter/* 16919304Speter * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 17019304Speter */ 17119304Speterstatic int shutdown_howto = 0; 17219304Speter 17319304Spetervoid 17419304Spetershutdown_nice(int howto) 17519304Speter{ 17619304Speter 17719304Speter shutdown_howto = howto; 17819304Speter 17919304Speter /* Send a signal to init(8) and have it shutdown the world */ 18019304Speter if (initproc != NULL) { 181254225Speter PROC_LOCK(initproc); 18219304Speter psignal(initproc, SIGINT); 18319304Speter PROC_UNLOCK(initproc); 18419304Speter } else { 18519304Speter /* No init(8) running, so simply reboot */ 18619304Speter boot(RB_NOSYNC); 18719304Speter } 18819304Speter return; 18919304Speter} 19019304Speterstatic int waittime = -1; 19119304Speter 19219304Speterstatic void 19319304Speterprint_uptime(void) 19419304Speter{ 19519304Speter int f; 19619304Speter struct timespec ts; 19719304Speter 19819304Speter getnanouptime(&ts); 19919304Speter printf("Uptime: "); 200254225Speter f = 0; 20119304Speter if (ts.tv_sec >= 86400) { 20219304Speter printf("%ldd", (long)ts.tv_sec / 86400); 20319304Speter ts.tv_sec %= 86400; 20419304Speter f = 1; 20519304Speter } 20619304Speter if (f || ts.tv_sec >= 3600) { 20719304Speter printf("%ldh", (long)ts.tv_sec / 3600); 20819304Speter ts.tv_sec %= 3600; 20919304Speter f = 1; 21019304Speter } 21119304Speter if (f || ts.tv_sec >= 60) { 21219304Speter printf("%ldm", (long)ts.tv_sec / 60); 21319304Speter ts.tv_sec %= 60; 21419304Speter f = 1; 21519304Speter } 21619304Speter printf("%lds\n", (long)ts.tv_sec); 21719304Speter} 21819304Speter 21919304Speterstatic void 22019304Speterdoadump(void) 22119304Speter{ 22219304Speter 22319304Speter /* 22419304Speter * Sometimes people have to call this from the kernel debugger. 22519304Speter * (if 'panic' can not dump) 22619304Speter * Give them a clue as to why they can't dump. 22719304Speter */ 22819304Speter if (dumper.dumper == NULL) { 22919304Speter printf("Cannot dump. No dump device defined.\n"); 23019304Speter return; 23119304Speter } 23219304Speter 23319304Speter savectx(&dumppcb); 23419304Speter dumptid = curthread->td_tid; 23519304Speter dumping++; 23619304Speter dumpsys(&dumper); 23719304Speter} 23819304Speter 23919304Speterstatic int 240254225Speterisbufbusy(struct buf *bp) 24119304Speter{ 24219304Speter if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 24319304Speter BUF_REFCNT(bp) > 0) || 24419304Speter ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 24519304Speter return (1); 24619304Speter return (0); 24719304Speter} 24819304Speter 24919304Speter/* 25019304Speter * Shutdown the system cleanly to prepare for reboot, halt, or power off. 25119304Speter */ 252254225Speterstatic void 25319304Speterboot(int howto) 25419304Speter{ 25519304Speter static int first_buf_printf = 1; 25619304Speter 25719304Speter#if defined(SMP) 25819304Speter /* 25919304Speter * Bind us to CPU 0 so that all shutdown code runs there. Some 26019304Speter * systems don't shutdown properly (i.e., ACPI power off) if we 26119304Speter * run on another processor. 262254225Speter */ 26319304Speter mtx_lock_spin(&sched_lock); 26419304Speter sched_bind(curthread, 0); 26519304Speter mtx_unlock_spin(&sched_lock); 26619304Speter KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 26719304Speter#endif 26819304Speter 26919304Speter /* collect extra flags that shutdown_nice might have set */ 27019304Speter howto |= shutdown_howto; 27119304Speter 27219304Speter /* We are out of the debugger now. */ 27319304Speter kdb_active = 0; 27419304Speter 27519304Speter /* 27619304Speter * Do any callouts that should be done BEFORE syncing the filesystems. 27719304Speter */ 27819304Speter EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 27919304Speter 280254225Speter /* 28119304Speter * Now sync filesystems 28219304Speter */ 283254225Speter if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 28419304Speter register struct buf *bp; 28519304Speter int iter, nbusy, pbusy; 28619304Speter#ifndef PREEMPTION 28719304Speter int subiter; 28819304Speter#endif 28919304Speter 29019304Speter waittime = 0; 29119304Speter 29219304Speter sync(curthread, NULL); 29319304Speter 29419304Speter /* 29519304Speter * With soft updates, some buffers that are 29619304Speter * written will be remarked as dirty until other 29719304Speter * buffers are written. 29819304Speter */ 29919304Speter for (iter = pbusy = 0; iter < 20; iter++) { 30019304Speter nbusy = 0; 30119304Speter for (bp = &buf[nbuf]; --bp >= buf; ) 302254225Speter if (isbufbusy(bp)) 30319304Speter nbusy++; 30419304Speter if (nbusy == 0) { 30519304Speter if (first_buf_printf) 30619304Speter printf("All buffers synced."); 30719304Speter break; 30819304Speter } 30919304Speter if (first_buf_printf) { 31019304Speter printf("Syncing disks, buffers remaining... "); 31119304Speter first_buf_printf = 0; 31219304Speter } 31319304Speter printf("%d ", nbusy); 31419304Speter if (nbusy < pbusy) 31519304Speter iter = 0; 31619304Speter pbusy = nbusy; 31719304Speter sync(curthread, NULL); 31819304Speter 31919304Speter#ifdef PREEMPTION 32019304Speter /* 32119304Speter * Drop Giant and spin for a while to allow 32219304Speter * interrupt threads to run. 32319304Speter */ 32419304Speter DROP_GIANT(); 32519304Speter DELAY(50000 * iter); 32619304Speter PICKUP_GIANT(); 32719304Speter#else 32819304Speter /* 32919304Speter * Drop Giant and context switch several times to 33019304Speter * allow interrupt threads to run. 331254225Speter */ 33219304Speter DROP_GIANT(); 33319304Speter for (subiter = 0; subiter < 50 * iter; subiter++) { 33419304Speter mtx_lock_spin(&sched_lock); 33519304Speter mi_switch(SW_VOL, NULL); 33619304Speter mtx_unlock_spin(&sched_lock); 33719304Speter DELAY(1000); 33819304Speter } 33919304Speter PICKUP_GIANT(); 34019304Speter#endif 34119304Speter } 34219304Speter printf("\n"); 34319304Speter /* 34419304Speter * Count only busy local buffers to prevent forcing 34519304Speter * a fsck if we're just a client of a wedged NFS server 34619304Speter */ 34719304Speter nbusy = 0; 348254225Speter for (bp = &buf[nbuf]; --bp >= buf; ) { 34919304Speter if (isbufbusy(bp)) { 35019304Speter#if 0 35119304Speter/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 35219304Speter if (bp->b_dev == NULL) { 35319304Speter TAILQ_REMOVE(&mountlist, 35419304Speter bp->b_vp->v_mount, mnt_list); 35519304Speter continue; 35619304Speter } 35719304Speter#endif 35819304Speter nbusy++; 35919304Speter#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 36019304Speter printf( 36119304Speter "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n", 36219304Speter nbusy, bp->b_bufobj, 36319304Speter bp->b_flags, (long)bp->b_blkno, 36419304Speter (long)bp->b_lblkno); 36519304Speter#endif 36619304Speter } 36719304Speter } 36819304Speter if (nbusy) { 36919304Speter /* 37019304Speter * Failed to sync all blocks. Indicate this and don't 37119304Speter * unmount filesystems (thus forcing an fsck on reboot). 37219304Speter */ 37319304Speter printf("Giving up on %d buffers\n", nbusy); 37419304Speter DELAY(5000000); /* 5 seconds */ 37519304Speter } else { 37619304Speter if (!first_buf_printf) 37719304Speter printf("Final sync complete\n"); 37819304Speter /* 37919304Speter * Unmount filesystems 38019304Speter */ 38119304Speter if (panicstr == 0) 38219304Speter vfs_unmountall(); 38319304Speter } 38419304Speter DELAY(100000); /* wait for console output to finish */ 38519304Speter } 386254225Speter 38719304Speter print_uptime(); 38819304Speter 38919304Speter /* 39019304Speter * Ok, now do things that assume all filesystem activity has 39119304Speter * been completed. 39219304Speter */ 39319304Speter EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 39419304Speter 39519304Speter /* XXX This doesn't disable interrupts any more. Reconsider? */ 39619304Speter splhigh(); 39719304Speter 398254225Speter if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 39919304Speter doadump(); 40019304Speter 40119304Speter /* Now that we're going to really halt the system... */ 40219304Speter EVENTHANDLER_INVOKE(shutdown_final, howto); 40319304Speter 40419304Speter for(;;) ; /* safety against shutdown_reset not working */ 40519304Speter /* NOTREACHED */ 40619304Speter} 40719304Speter 408254225Speter/* 40919304Speter * If the shutdown was a clean halt, behave accordingly. 41019304Speter */ 41119304Speterstatic void 41219304Spetershutdown_halt(void *junk, int howto) 41319304Speter{ 41419304Speter 41519304Speter if (howto & RB_HALT) { 41619304Speter printf("\n"); 41719304Speter printf("The operating system has halted.\n"); 41819304Speter printf("Please press any key to reboot.\n\n"); 41919304Speter switch (cngetc()) { 42019304Speter case -1: /* No console, just die */ 42119304Speter cpu_halt(); 42219304Speter /* NOTREACHED */ 42319304Speter default: 42419304Speter howto &= ~RB_HALT; 42519304Speter break; 42619304Speter } 427254225Speter } 42819304Speter} 42919304Speter 430254225Speter/* 43119304Speter * Check to see if the system paniced, pause and then reboot 43219304Speter * according to the specified delay. 43319304Speter */ 43419304Speterstatic void 43519304Spetershutdown_panic(void *junk, int howto) 43619304Speter{ 43719304Speter int loop; 43819304Speter 43919304Speter if (howto & RB_DUMP) { 44019304Speter if (PANIC_REBOOT_WAIT_TIME != 0) { 44119304Speter if (PANIC_REBOOT_WAIT_TIME != -1) { 44219304Speter printf("Automatic reboot in %d seconds - " 44319304Speter "press a key on the console to abort\n", 44419304Speter PANIC_REBOOT_WAIT_TIME); 44519304Speter for (loop = PANIC_REBOOT_WAIT_TIME * 10; 44619304Speter loop > 0; --loop) { 44719304Speter DELAY(1000 * 100); /* 1/10th second */ 44819304Speter /* Did user type a key? */ 449254225Speter if (cncheckc() != -1) 45019304Speter break; 45119304Speter } 45219304Speter if (!loop) 45319304Speter return; 45419304Speter } 45519304Speter } else { /* zero time specified - reboot NOW */ 45619304Speter return; 45719304Speter } 45819304Speter printf("--> Press a key on the console to reboot,\n"); 45919304Speter printf("--> or switch off the system now.\n"); 46019304Speter cngetc(); 46119304Speter } 46219304Speter} 46319304Speter 46419304Speter/* 46519304Speter * Everything done, now reset 46619304Speter */ 46719304Speterstatic void 46819304Spetershutdown_reset(void *junk, int howto) 46919304Speter{ 47019304Speter 47119304Speter printf("Rebooting...\n"); 47219304Speter DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 47319304Speter /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 47419304Speter cpu_reset(); 47519304Speter /* NOTREACHED */ /* assuming reset worked */ 47619304Speter} 47719304Speter 478254225Speter#ifdef SMP 47919304Speterstatic u_int panic_cpu = NOCPU; 48019304Speter#endif 48119304Speter 48219304Speter/* 48319304Speter * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 48419304Speter * and then reboots. If we are called twice, then we avoid trying to sync 48519304Speter * the disks as this often leads to recursive panics. 48619304Speter * 48719304Speter * MPSAFE 48819304Speter */ 48919304Spetervoid 49019304Speterpanic(const char *fmt, ...) 49119304Speter{ 49219304Speter struct thread *td = curthread; 49319304Speter int bootopt, newpanic; 49419304Speter va_list ap; 495254225Speter static char buf[256]; 49619304Speter 49719304Speter#ifdef SMP 49819304Speter /* 49919304Speter * We don't want multiple CPU's to panic at the same time, so we 50019304Speter * use panic_cpu as a simple spinlock. We have to keep checking 50119304Speter * panic_cpu if we are spinning in case the panic on the first 50219304Speter * CPU is canceled. 50319304Speter */ 50419304Speter if (panic_cpu != PCPU_GET(cpuid)) 50519304Speter while (atomic_cmpset_int(&panic_cpu, NOCPU, 50619304Speter PCPU_GET(cpuid)) == 0) 50719304Speter while (panic_cpu != NOCPU) 50819304Speter ; /* nothing */ 50919304Speter#endif 51019304Speter 51119304Speter bootopt = RB_AUTOBOOT | RB_DUMP; 51219304Speter newpanic = 0; 51319304Speter if (panicstr) 51419304Speter bootopt |= RB_NOSYNC; 51519304Speter else { 51619304Speter panicstr = fmt; 51719304Speter newpanic = 1; 51819304Speter } 51919304Speter 52019304Speter va_start(ap, fmt); 52119304Speter if (newpanic) { 52219304Speter (void)vsnprintf(buf, sizeof(buf), fmt, ap); 52319304Speter panicstr = buf; 52419304Speter printf("panic: %s\n", buf); 52519304Speter } else { 52619304Speter printf("panic: "); 527 vprintf(fmt, ap); 528 printf("\n"); 529 } 530 va_end(ap); 531#ifdef SMP 532 printf("cpuid = %d\n", PCPU_GET(cpuid)); 533#endif 534 535#ifdef KDB 536 if (newpanic && trace_on_panic) 537 kdb_backtrace(); 538 if (debugger_on_panic) 539 kdb_enter("panic"); 540#ifdef RESTARTABLE_PANICS 541 /* See if the user aborted the panic, in which case we continue. */ 542 if (panicstr == NULL) { 543#ifdef SMP 544 atomic_store_rel_int(&panic_cpu, NOCPU); 545#endif 546 return; 547 } 548#endif 549#endif 550 mtx_lock_spin(&sched_lock); 551 td->td_flags |= TDF_INPANIC; 552 mtx_unlock_spin(&sched_lock); 553 if (!sync_on_panic) 554 bootopt |= RB_NOSYNC; 555 boot(bootopt); 556} 557 558/* 559 * Support for poweroff delay. 560 */ 561#ifndef POWEROFF_DELAY 562# define POWEROFF_DELAY 5000 563#endif 564static int poweroff_delay = POWEROFF_DELAY; 565 566SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 567 &poweroff_delay, 0, ""); 568 569static void 570poweroff_wait(void *junk, int howto) 571{ 572 573 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 574 return; 575 DELAY(poweroff_delay * 1000); 576} 577 578/* 579 * Some system processes (e.g. syncer) need to be stopped at appropriate 580 * points in their main loops prior to a system shutdown, so that they 581 * won't interfere with the shutdown process (e.g. by holding a disk buf 582 * to cause sync to fail). For each of these system processes, register 583 * shutdown_kproc() as a handler for one of shutdown events. 584 */ 585static int kproc_shutdown_wait = 60; 586SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 587 &kproc_shutdown_wait, 0, ""); 588 589void 590kproc_shutdown(void *arg, int howto) 591{ 592 struct proc *p; 593 char procname[MAXCOMLEN + 1]; 594 int error; 595 596 if (panicstr) 597 return; 598 599 p = (struct proc *)arg; 600 strlcpy(procname, p->p_comm, sizeof(procname)); 601 printf("Waiting (max %d seconds) for system process `%s' to stop...", 602 kproc_shutdown_wait, procname); 603 error = kthread_suspend(p, kproc_shutdown_wait * hz); 604 605 if (error == EWOULDBLOCK) 606 printf("timed out\n"); 607 else 608 printf("done\n"); 609} 610 611/* Registration of dumpers */ 612int 613set_dumper(struct dumperinfo *di) 614{ 615 616 if (di == NULL) { 617 bzero(&dumper, sizeof dumper); 618 return (0); 619 } 620 if (dumper.dumper != NULL) 621 return (EBUSY); 622 dumper = *di; 623 return (0); 624} 625 626#if defined(__powerpc__) 627void 628dumpsys(struct dumperinfo *di __unused) 629{ 630 631 printf("Kernel dumps not implemented on this architecture\n"); 632} 633#endif 634