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 1.10.2.3 1999/09/05 08:15:03 peter Exp $
   40  */
   41 
   42 #include "opt_ddb.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/reboot.h>
   47 #include <sys/msgbuf.h>
   48 #include <sys/proc.h>
   49 #include <sys/vnode.h>
   50 #include <sys/tty.h>
   51 #include <sys/tprintf.h>
   52 #include <sys/syslog.h>
   53 #include <sys/malloc.h>
   54 #include <sys/kernel.h>
   55 #include <sys/sysctl.h>
   56 #include <sys/conf.h>
   57 #include <sys/sysproto.h>
   58 
   59 #include <machine/pcb.h>
   60 #include <machine/clock.h>
   61 #include <machine/cons.h>
   62 #include <machine/md_var.h>
   63 
   64 #include <sys/utsname.h>
   65 #include <sys/signalvar.h>
   66 
   67 #ifndef PANIC_REBOOT_WAIT_TIME
   68 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   69 #endif
   70 
   71 /*
   72  * Note that stdarg.h and the ANSI style va_start macro is used for both
   73  * ANSI and traditional C compilers.
   74  */
   75 #include <machine/stdarg.h>
   76 
   77 #if defined(DDB)
   78 #ifdef DDB_UNATTENDED
   79         static int debugger_on_panic = 0;
   80 #else
   81         static int debugger_on_panic = 1;
   82 #endif
   83 
   84 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   85         &debugger_on_panic, 0, "");
   86 #endif
   87 
   88 
   89 #ifdef  HW_WDOG
   90 /*
   91  * If there is a hardware watchdog, point this at the function needed to
   92  * hold it off.
   93  * It's needed when the kernel needs to do some lengthy operations.
   94  * e.g. in wd.c when dumping core.. It's most annoying to have
   95  * your precious core-dump only half written because the wdog kicked in.
   96  */
   97 watchdog_tickle_fn wdog_tickler = NULL;
   98 #endif  /* HW_WDOG */
   99 
  100 /*
  101  * Variable panicstr contains argument to first call to panic; used as flag
  102  * to indicate that the kernel has already called panic.
  103  */
  104 const char *panicstr;
  105 
  106 /*
  107  * callout list for things to do a shutdown
  108  */
  109 typedef struct shutdown_list_element {
  110         struct shutdown_list_element *next;
  111         bootlist_fn function;
  112         void *arg;
  113 } *sle_p;
  114 
  115 /*
  116  * there are two shutdown lists. Some things need to be shut down
  117  * Earlier than others.
  118  */
  119 static sle_p shutdown_list1;
  120 static sle_p shutdown_list2;
  121 
  122 
  123 static void dumpsys(void);
  124 
  125 #ifndef _SYS_SYSPROTO_H_
  126 struct reboot_args {
  127         int     opt;
  128 };
  129 #endif
  130 /* ARGSUSED */
  131 
  132 /*
  133  * The system call that results in a reboot
  134  */
  135 int
  136 reboot(p, uap, retval)
  137         struct proc *p;
  138         struct reboot_args *uap;
  139         int *retval;
  140 {
  141         int error;
  142 
  143         if ((error = suser(p->p_ucred, &p->p_acflag)))
  144                 return (error);
  145 
  146         boot(uap->opt);
  147         return (0);
  148 }
  149 
  150 /*
  151  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  152  */
  153 void
  154 shutdown_nice(void)
  155 {
  156         /* Send a signal to init(8) and have it shutdown the world */
  157         if (initproc != NULL) {
  158                 psignal(initproc, SIGINT);
  159         } else {
  160                 /* No init(8) running, so simply reboot */
  161                 boot(RB_NOSYNC);
  162         }
  163         return;
  164 }
  165 static int      waittime = -1;
  166 static struct pcb dumppcb;
  167 
  168 /*
  169  *  Go through the rigmarole of shutting down..
  170  * this used to be in machdep.c but I'll be dammned if I could see
  171  * anything machine dependant in it.
  172  */
  173 void
  174 boot(howto)
  175         int howto;
  176 {
  177         sle_p ep;
  178 
  179         /*
  180          * Do any callouts that should be done BEFORE syncing the filesystems.
  181          */
  182         ep = shutdown_list1;
  183         while (ep) {
  184                 shutdown_list1 = ep->next;
  185                 (*ep->function)(howto, ep->arg);
  186                 ep = ep->next;
  187         }
  188 
  189         /* 
  190          * Now sync filesystems
  191          */
  192         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  193                 register struct buf *bp;
  194                 int iter, nbusy;
  195 
  196                 waittime = 0;
  197                 printf("\nsyncing disks... ");
  198 
  199                 sync(&proc0, NULL, NULL);
  200 
  201                 for (iter = 0; iter < 20; iter++) {
  202                         nbusy = 0;
  203                         for (bp = &buf[nbuf]; --bp >= buf; ) {
  204                                 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
  205                                         nbusy++;
  206                                 }
  207                         }
  208                         if (nbusy == 0)
  209                                 break;
  210                         printf("%d ", nbusy);
  211                         DELAY(40000 * iter);
  212                 }
  213                 if (nbusy) {
  214                         /*
  215                          * Failed to sync all blocks. Indicate this and don't
  216                          * unmount filesystems (thus forcing an fsck on reboot).
  217                          */
  218                         printf("giving up\n");
  219 #ifdef SHOW_BUSYBUFS
  220                         nbusy = 0;
  221                         for (bp = &buf[nbuf]; --bp >= buf; ) {
  222                                 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) {
  223                                         nbusy++;
  224                                         printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno);
  225                                 }
  226                         }
  227                         DELAY(5000000); /* 5 seconds */
  228 #endif
  229                 } else {
  230                         printf("done\n");
  231                         /*
  232                          * Unmount filesystems
  233                          */
  234                         if (panicstr == 0)
  235                                 vfs_unmountall();
  236                 }
  237                 DELAY(100000);                  /* wait for console output to finish */
  238         }
  239 
  240         /*
  241          * Ok, now do things that assume all filesystem activity has
  242          * been completed.
  243          */
  244         ep = shutdown_list2;
  245         while (ep) {
  246                 shutdown_list2 = ep->next;
  247                 (*ep->function)(howto, ep->arg);
  248                 ep = ep->next;
  249         }
  250         splhigh();
  251         if (howto & RB_HALT) {
  252                 printf("\n");
  253                 printf("The operating system has halted.\n");
  254                 printf("Please press any key to reboot.\n\n");
  255                 switch (cngetc()) {
  256                 case -1:                /* No console, just die */
  257                         cpu_halt();
  258                         /* NOTREACHED */
  259                 default:
  260                         break;
  261                 }
  262         } else {
  263                 if (howto & RB_DUMP) {
  264                         if (!cold) {
  265                                 savectx(&dumppcb);
  266                                 dumppcb.pcb_cr3 = rcr3();
  267                                 dumpsys();
  268                         }
  269 
  270                         if (PANIC_REBOOT_WAIT_TIME != 0) {
  271                                 if (PANIC_REBOOT_WAIT_TIME != -1) {
  272                                         int loop;
  273                                         printf("Automatic reboot in %d seconds - press a key on the console to abort\n",
  274                                                 PANIC_REBOOT_WAIT_TIME);
  275                                         for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) {
  276                                                 DELAY(1000 * 100); /* 1/10th second */
  277                                                 /* Did user type a key? */
  278                                                 if (cncheckc() != -1)
  279                                                         break;
  280                                         }
  281                                         if (!loop)
  282                                                 goto die;
  283                                 }
  284                         } else { /* zero time specified - reboot NOW */
  285                                 goto die;
  286                         }
  287                         printf("--> Press a key on the console to reboot <--\n");
  288                         cngetc();
  289                 }
  290         }
  291 die:
  292         printf("Rebooting...\n");
  293         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  294         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  295         cpu_reset();
  296         for(;;) ;
  297         /* NOTREACHED */
  298 }
  299 
  300 /*
  301  * Magic number for savecore
  302  *
  303  * exported (symorder) and used at least by savecore(8)
  304  *
  305  */
  306 static u_long const     dumpmag = 0x8fca0101UL; 
  307 
  308 static int      dumpsize = 0;           /* also for savecore */
  309 
  310 static int      dodump = 1;
  311 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, "");
  312 
  313 /* ARGSUSED */
  314 static void dump_conf __P((void *dummy));
  315 static void
  316 dump_conf(dummy)
  317         void *dummy;
  318 {
  319         cpu_dumpconf();
  320 }
  321 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
  322 
  323 /*
  324  * Doadump comes here after turning off memory management and
  325  * getting on the dump stack, either when called above, or by
  326  * the auto-restart code.
  327  */
  328 static void
  329 dumpsys(void)
  330 {
  331 
  332         if (!dodump)
  333                 return;
  334         if (dumpdev == NODEV)
  335                 return;
  336         if ((minor(dumpdev)&07) != 1)
  337                 return;
  338         if (!(bdevsw[major(dumpdev)]))
  339                 return;
  340         if (!(bdevsw[major(dumpdev)]->d_dump))
  341                 return;
  342         dumpsize = Maxmem;
  343         printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo);
  344         printf("dump ");
  345         switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) {
  346 
  347         case ENXIO:
  348                 printf("device bad\n");
  349                 break;
  350 
  351         case EFAULT:
  352                 printf("device not ready\n");
  353                 break;
  354 
  355         case EINVAL:
  356                 printf("area improper\n");
  357                 break;
  358 
  359         case EIO:
  360                 printf("i/o error\n");
  361                 break;
  362 
  363         case EINTR:
  364                 printf("aborted from console\n");
  365                 break;
  366 
  367         default:
  368                 printf("succeeded\n");
  369                 break;
  370         }
  371 }
  372 
  373 /*
  374  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  375  * and then reboots.  If we are called twice, then we avoid trying to sync
  376  * the disks as this often leads to recursive panics.
  377  */
  378 void
  379 panic(const char *fmt, ...)
  380 {
  381         int bootopt;
  382         va_list ap;
  383 
  384         bootopt = RB_AUTOBOOT | RB_DUMP;
  385         if (panicstr)
  386                 bootopt |= RB_NOSYNC;
  387         else
  388                 panicstr = fmt;
  389 
  390         printf("panic: ");
  391         va_start(ap, fmt);
  392         vprintf(fmt, ap);
  393         va_end(ap);
  394         printf("\n");
  395 
  396 #if defined(DDB)
  397         if (debugger_on_panic)
  398                 Debugger ("panic");
  399 #endif
  400         boot(bootopt);
  401 }
  402 
  403 /*
  404  * Two routines to handle adding/deleting items on the
  405  * shutdown callout lists
  406  *
  407  * at_shutdown():
  408  * Take the arguments given and put them onto the shutdown callout list.
  409  * However first make sure that it's not already there.
  410  * returns 0 on success.
  411  */
  412 int
  413 at_shutdown(bootlist_fn function, void *arg, int position)
  414 {
  415         sle_p ep, *epp;
  416 
  417         switch(position) {
  418         case SHUTDOWN_PRE_SYNC:
  419                 epp = &shutdown_list1;
  420                 break;
  421         case SHUTDOWN_POST_SYNC:
  422                 epp = &shutdown_list2;
  423                 break;
  424         default:
  425                 printf("bad exit callout list specified\n");
  426                 return (EINVAL);
  427         }
  428         if (rm_at_shutdown(function, arg))
  429                 printf("exit callout entry already present\n");
  430         ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT);
  431         if (ep == NULL)
  432                 return (ENOMEM);
  433         ep->next = *epp;
  434         ep->function = function;
  435         ep->arg = arg;
  436         *epp = ep;
  437         return (0);
  438 }
  439 
  440 /*
  441  * Scan the exit callout lists for the given items and remove them.
  442  * Returns the number of items removed.
  443  */
  444 int
  445 rm_at_shutdown(bootlist_fn function, void *arg)
  446 {
  447         sle_p *epp, ep;
  448         int count;
  449 
  450         count = 0;
  451         epp = &shutdown_list1;
  452         ep = *epp;
  453         while (ep) {
  454                 if ((ep->function == function) && (ep->arg == arg)) {
  455                         *epp = ep->next;
  456                         free(ep, M_TEMP);
  457                         count++;
  458                 } else {
  459                         epp = &ep->next;
  460                 }
  461                 ep = *epp;
  462         }
  463         epp = &shutdown_list2;
  464         ep = *epp;
  465         while (ep) {
  466                 if ((ep->function == function) && (ep->arg == arg)) {
  467                         *epp = ep->next;
  468                         free(ep, M_TEMP);
  469                         count++;
  470                 } else {
  471                         epp = &ep->next;
  472                 }
  473                 ep = *epp;
  474         }
  475         return (count);
  476 }
  477
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_shutdown.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_shutdown.c
