diff options
Diffstat (limited to 'sys/kern/kern_shutdown.c')
| -rw-r--r-- | sys/kern/kern_shutdown.c | 429 |
1 files changed, 429 insertions, 0 deletions
diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c new file mode 100644 index 0000000..1c217be --- /dev/null +++ b/sys/kern/kern_shutdown.c @@ -0,0 +1,429 @@ +/*- + * Copyright (c) 1986, 1988, 1991, 1993 + * The Regents of the University of California. All rights reserved. + * (c) UNIX System Laboratories, Inc. + * All or some portions of this file are derived from material licensed + * to the University of California by American Telephone and Telegraph + * Co. or Unix System Laboratories, Inc. and are reproduced herein with + * the permission of UNIX System Laboratories, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 + * $Id: subr_prf.c,v 1.37 1996/05/09 18:58:06 gpalmer Exp $ + */ + +#include "opt_ddb.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/reboot.h> +#include <sys/msgbuf.h> +#include <sys/proc.h> +#include <sys/vnode.h> +#include <sys/tty.h> +#include <sys/tprintf.h> +#include <sys/syslog.h> +#include <sys/malloc.h> +#include <sys/kernel.h> +#include <sys/sysctl.h> +#include <sys/devconf.h> +#include <sys/conf.h> +#include <sys/sysproto.h> + +#include <machine/pcb.h> +#include <machine/clock.h> +#include <machine/cons.h> +#include <machine/md_var.h> + +#include <sys/utsname.h> +#include <sys/signalvar.h> + +#ifndef PANIC_REBOOT_WAIT_TIME +#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ +#endif + +/* + * Note that stdarg.h and the ANSI style va_start macro is used for both + * ANSI and traditional C compilers. + */ +#include <machine/stdarg.h> + +#if defined(DDB) +#ifdef DDB_UNATTENDED + static int debugger_on_panic = 0; +#else + static int debugger_on_panic = 1; +#endif + +SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, + &debugger_on_panic, 0, ""); +#endif + + +/* + * Variable panicstr contains argument to first call to panic; used as flag + * to indicate that the kernel has already called panic. + */ +const char *panicstr; + +/* + * callout list for things to do a shutdown + */ +typedef struct shutdown_list_element { + struct shutdown_list_element *next; + bootlist_fn function; + void *arg; +} *sle_p; + +static sle_p shutdown_list; + + + +/* This implements a "TEXT_SET" for cleanup functions */ +static void dummy_cleanup __P((void)); +static void +dummy_cleanup() {} +TEXT_SET(cleanup_set, dummy_cleanup); + +typedef void (*cleanup_func_t)(void); +extern const struct linker_set cleanup_set; +static const cleanup_func_t *cleanups = + (const cleanup_func_t *)&cleanup_set.ls_items[0]; +static void dumpsys(void); + +#ifndef _SYS_SYSPROTO_H_ +struct reboot_args { + int opt; +}; +#endif +/* ARGSUSED */ + +/* + * The system call that results in a reboot + */ +int +reboot(p, uap, retval) + struct proc *p; + struct reboot_args *uap; + int *retval; +{ + int error; + + if ((error = suser(p->p_ucred, &p->p_acflag))) + return (error); + + boot(uap->opt); + return (0); +} + +/* + * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC + */ +void +shutdown_nice(void) +{ + /* Send a signal to init(8) and have it shutdown the world */ + if (initproc != NULL) { + psignal(initproc, SIGINT); + } else { + /* No init(8) running, so simply reboot */ + boot(RB_NOSYNC); + } + return; +} +static int waittime = -1; +static struct pcb dumppcb; + +/* + * Go through the rigmarole of shutting down.. + * this used to be in machdep.c but I'll be dammned if I could see + * anything machine dependant in it. + */ +__dead void +boot(howto) + int howto; +{ + sle_p ep = shutdown_list; + + /* + * eventually the at_shutdown() method will totally replace the + * linker set but for now leave them both (so 3rd partys + * modules that might use it can not break). + * The linker set is no good for LKMs etc. + */ + if ((howto & RB_NOSYNC) == 0 ) { + printf("\ncleaning up... "); + while(*cleanups) { + printf("Using obsolete shutdown callout..\n"); + printf("update code to use at_shutdown()\n"); + (**cleanups++)(); + } + } + while(ep) { + shutdown_list = ep->next; + (*ep->function)(howto, ep->arg); + ep = ep->next; + } + if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { + register struct buf *bp; + int iter, nbusy; + + waittime = 0; + printf("\nsyncing disks... "); + + sync(&proc0, NULL, NULL); + + for (iter = 0; iter < 20; iter++) { + nbusy = 0; + for (bp = &buf[nbuf]; --bp >= buf; ) { + if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { + nbusy++; + } + } + if (nbusy == 0) + break; + printf("%d ", nbusy); + DELAY(40000 * iter); + } + if (nbusy) { + /* + * Failed to sync all blocks. Indicate this and don't + * unmount filesystems (thus forcing an fsck on reboot). + */ + printf("giving up\n"); +#ifdef SHOW_BUSYBUFS + nbusy = 0; + for (bp = &buf[nbuf]; --bp >= buf; ) { + if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { + nbusy++; + printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); + } + } + DELAY(5000000); /* 5 seconds */ +#endif + } else { + printf("done\n"); + /* + * Unmount filesystems + */ + if (panicstr == 0) + vfs_unmountall(); + } + DELAY(100000); /* wait for console output to finish */ + dev_shutdownall(FALSE); + } + splhigh(); + if (howto & RB_HALT) { + printf("\n"); + printf("The operating system has halted.\n"); + printf("Please press any key to reboot.\n\n"); + cngetc(); + } else { + if (howto & RB_DUMP) { + if (!cold) { + savectx(&dumppcb); + dumppcb.pcb_cr3 = rcr3(); + dumpsys(); + } + + if (PANIC_REBOOT_WAIT_TIME != 0) { + if (PANIC_REBOOT_WAIT_TIME != -1) { + int loop; + printf("Automatic reboot in %d seconds - press a key on the console to abort\n", + PANIC_REBOOT_WAIT_TIME); + for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { + DELAY(1000 * 100); /* 1/10th second */ + if (cncheckc()) /* Did user type a key? */ + break; + } + if (!loop) + goto die; + } + } else { /* zero time specified - reboot NOW */ + goto die; + } + printf("--> Press a key on the console to reboot <--\n"); + cngetc(); + } + } +die: + printf("Rebooting...\n"); + DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ + cpu_reset(); + for(;;) ; + /* NOTREACHED */ +} + +/* + * Magic number for savecore + * + * exported (symorder) and used at least by savecore(8) + * + */ +static u_long const dumpmag = 0x8fca0101UL; + +static int dumpsize = 0; /* also for savecore */ + +static int dodump = 1; +SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); + +/* + * Doadump comes here after turning off memory management and + * getting on the dump stack, either when called above, or by + * the auto-restart code. + */ +static void +dumpsys(void) +{ + + if (!dodump) + return; + if (dumpdev == NODEV) + return; + if ((minor(dumpdev)&07) != 1) + return; + if (!(bdevsw[major(dumpdev)])) + return; + if (!(bdevsw[major(dumpdev)]->d_dump)) + return; + dumpsize = Maxmem; + printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); + printf("dump "); + switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { + + case ENXIO: + printf("device bad\n"); + break; + + case EFAULT: + printf("device not ready\n"); + break; + + case EINVAL: + printf("area improper\n"); + break; + + case EIO: + printf("i/o error\n"); + break; + + case EINTR: + printf("aborted from console\n"); + break; + + default: + printf("succeeded\n"); + break; + } +} + +/* + * Panic is called on unresolvable fatal errors. It prints "panic: mesg", + * and then reboots. If we are called twice, then we avoid trying to sync + * the disks as this often leads to recursive panics. + */ +#ifdef __GNUC__ +__dead /* panic() does not return */ +#endif +void +panic(const char *fmt, ...) +{ + int bootopt; + va_list ap; + + bootopt = RB_AUTOBOOT | RB_DUMP; + if (panicstr) + bootopt |= RB_NOSYNC; + else + panicstr = fmt; + + printf("panic: "); + va_start(ap, fmt); + vprintf(fmt, ap); + va_end(ap); + printf("\n"); + +#if defined(DDB) + if (debugger_on_panic) + Debugger ("panic"); +#endif + boot(bootopt); +} + + +/********************************************************* + * general routines to handle adding/deleting items on the + * shutdown callout list + ***** + * Take the arguments given and put them onto the shutdown callout list. + * However first make sure that it's not already there. + * returns 0 on success. + */ +int +at_shutdown(bootlist_fn function, void *arg) +{ + sle_p ep; + if(rm_at_shutdown(function, arg)) { + printf("exit callout entry already present\n"); + } + ep = malloc(sizeof(*ep),M_TEMP,M_NOWAIT); + if(!ep) return ENOMEM; + ep->next = shutdown_list; + ep->function = function; + ep->arg = arg; + shutdown_list = ep; + return 0; +} +/* + * Scan the exit callout list for the given items and remove them. + * Returns the number of items removed. + */ +int +rm_at_shutdown(bootlist_fn function, void *arg) +{ + sle_p *epp,ep; + int count = 0; + + epp = &shutdown_list; + ep = *epp; + while(ep) { + if((ep->function == function) && (ep->arg = arg)) { + *epp = ep->next; + free(ep,M_TEMP); + count++; + } else { + epp = &ep->next; + } + ep = *epp; + } + return count; +} + + |
