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 $ 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.30 2006/06/05 07:26:10 dillon Exp $ 41 */ 42 43 #include "opt_ddb.h" 44 #include "opt_ddb_trace.h" 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> 65 #include <sys/device.h> 66 #include <sys/cons.h> 67 #include <sys/thread2.h> 68 #include <sys/buf2.h> 69 70 #include <machine/pcb.h> 71 #include <machine/clock.h> 72 #include <machine/md_var.h> 73 #include <machine/smp.h> /* smp_active_mask, cpuid */ 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 83 * ANSI and traditional C compilers. We use the machine version to stay 84 * within the confines of the kernel header files. 85 */ 86 #include <machine/stdarg.h> 87 88 #ifdef DDB 89 #ifdef DDB_UNATTENDED 90 int debugger_on_panic = 0; 91 #else 92 int debugger_on_panic = 1; 93 #endif 94 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 95 &debugger_on_panic, 0, "Run debugger on kernel panic"); 96 97 extern void db_print_backtrace(void); 98 99 #ifdef DDB_TRACE 100 int trace_on_panic = 1; 101 #else 102 int trace_on_panic = 0; 103 #endif 104 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 105 &trace_on_panic, 0, "Print stack trace on kernel panic"); 106 #endif 107 108 static int sync_on_panic = 1; 109 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 110 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 111 112 SYSCTL_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 */ 122 watchdog_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 */ 129 const char *panicstr; 130 131 int dumping; /* system is dumping */ 132 #ifdef SMP 133 u_int panic_cpu_interlock; /* panic interlock */ 134 globaldata_t panic_cpu_gd; /* which cpu took the panic */ 135 #endif 136 137 static void boot (int) __dead2; 138 static void dumpsys (void); 139 static int setdumpdev (dev_t dev); 140 static void poweroff_wait (void *, int); 141 static void print_uptime (void); 142 static void shutdown_halt (void *junk, int howto); 143 static void shutdown_panic (void *junk, int howto); 144 static void shutdown_reset (void *junk, int howto); 145 static int shutdown_busycount1(struct buf *bp, void *info); 146 static int shutdown_busycount2(struct buf *bp, void *info); 147 148 /* register various local shutdown events */ 149 static void 150 shutdown_conf(void *unused) 151 { 152 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 153 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 154 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 155 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 156 } 157 158 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 159 160 /* ARGSUSED */ 161 162 /* 163 * The system call that results in a reboot 164 */ 165 int 166 sys_reboot(struct reboot_args *uap) 167 { 168 struct thread *td = curthread; 169 int error; 170 171 if ((error = suser(td))) 172 return (error); 173 174 boot(uap->opt); 175 return (0); 176 } 177 178 /* 179 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 180 */ 181 static int shutdown_howto = 0; 182 183 void 184 shutdown_nice(int howto) 185 { 186 shutdown_howto = howto; 187 188 /* Send a signal to init(8) and have it shutdown the world */ 189 if (initproc != NULL) { 190 psignal(initproc, SIGINT); 191 } else { 192 /* No init(8) running, so simply reboot */ 193 boot(RB_NOSYNC); 194 } 195 return; 196 } 197 static int waittime = -1; 198 static struct thread *dumpthread; 199 static struct pcb dumppcb; 200 201 static void 202 print_uptime() 203 { 204 int f; 205 struct timespec ts; 206 207 getnanouptime(&ts); 208 printf("Uptime: "); 209 f = 0; 210 if (ts.tv_sec >= 86400) { 211 printf("%ldd", ts.tv_sec / 86400); 212 ts.tv_sec %= 86400; 213 f = 1; 214 } 215 if (f || ts.tv_sec >= 3600) { 216 printf("%ldh", ts.tv_sec / 3600); 217 ts.tv_sec %= 3600; 218 f = 1; 219 } 220 if (f || ts.tv_sec >= 60) { 221 printf("%ldm", ts.tv_sec / 60); 222 ts.tv_sec %= 60; 223 f = 1; 224 } 225 printf("%lds\n", ts.tv_sec); 226 } 227 228 /* 229 * Go through the rigmarole of shutting down.. 230 * this used to be in machdep.c but I'll be dammned if I could see 231 * anything machine dependant in it. 232 */ 233 static void 234 boot(int howto) 235 { 236 /* 237 * Get rid of any user scheduler baggage and then give 238 * us a high priority. 239 */ 240 if (curthread->td_release) 241 curthread->td_release(curthread); 242 lwkt_setpri_self(TDPRI_MAX); 243 244 /* collect extra flags that shutdown_nice might have set */ 245 howto |= shutdown_howto; 246 247 #ifdef SMP 248 /* 249 * We really want to shutdown on the BSP. Subsystems such as ACPI 250 * can't power-down the box otherwise. 251 */ 252 if (smp_active_mask > 1) { 253 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 254 } 255 if (panicstr == NULL && mycpu->gd_cpuid != 0) { 256 printf("Switching to cpu #0 for shutdown\n"); 257 lwkt_setcpu_self(globaldata_find(0)); 258 } 259 #endif 260 /* 261 * Do any callouts that should be done BEFORE syncing the filesystems. 262 */ 263 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 264 265 /* 266 * Now sync filesystems 267 */ 268 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 269 int iter, nbusy, pbusy; 270 271 waittime = 0; 272 printf("\nsyncing disks... "); 273 274 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 275 276 /* 277 * With soft updates, some buffers that are 278 * written will be remarked as dirty until other 279 * buffers are written. 280 */ 281 for (iter = pbusy = 0; iter < 20; iter++) { 282 nbusy = scan_all_buffers(shutdown_busycount1, NULL); 283 if (nbusy == 0) 284 break; 285 printf("%d ", nbusy); 286 if (nbusy < pbusy) 287 iter = 0; 288 pbusy = nbusy; 289 /* 290 * XXX: 291 * Process soft update work queue if buffers don't sync 292 * after 6 iterations by permitting the syncer to run. 293 */ 294 if (iter > 5 && bioops.io_sync) 295 (*bioops.io_sync)(NULL); 296 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 297 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); 298 } 299 printf("\n"); 300 /* 301 * Count only busy local buffers to prevent forcing 302 * a fsck if we're just a client of a wedged NFS server 303 */ 304 nbusy = scan_all_buffers(shutdown_busycount2, NULL); 305 if (nbusy) { 306 /* 307 * Failed to sync all blocks. Indicate this and don't 308 * unmount filesystems (thus forcing an fsck on reboot). 309 */ 310 printf("giving up on %d buffers\n", nbusy); 311 #ifdef DDB 312 Debugger("busy buffer problem"); 313 #endif /* DDB */ 314 tsleep(boot, 0, "shutdn", hz * 5 + 1); 315 } else { 316 printf("done\n"); 317 /* 318 * Unmount filesystems 319 */ 320 if (panicstr == 0) 321 vfs_unmountall(); 322 } 323 tsleep(boot, 0, "shutdn", hz / 10 + 1); 324 } 325 326 print_uptime(); 327 328 /* 329 * Ok, now do things that assume all filesystem activity has 330 * been completed. 331 */ 332 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 333 crit_enter(); 334 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 335 dumpsys(); 336 337 /* Now that we're going to really halt the system... */ 338 EVENTHANDLER_INVOKE(shutdown_final, howto); 339 340 for(;;) ; /* safety against shutdown_reset not working */ 341 /* NOTREACHED */ 342 } 343 344 static int 345 shutdown_busycount1(struct buf *bp, void *info) 346 { 347 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0) 348 return(1); 349 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) 350 return (1); 351 return (0); 352 } 353 354 static int 355 shutdown_busycount2(struct buf *bp, void *info) 356 { 357 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) || 358 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 359 /* 360 * Only count buffers undergoing write I/O 361 * on the related vnode. 362 */ 363 if (bp->b_vp == NULL || 364 bp->b_vp->v_track_write.bk_active == 0) { 365 return (0); 366 } 367 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 368 printf( 369 "%p dev:?, flags:%08lx, loffset:%lld, doffset:%lld\n", 370 bp, 371 bp->b_flags, bp->b_loffset, 372 bp->b_bio2.bio_offset); 373 #endif 374 return(1); 375 } 376 return(0); 377 } 378 379 /* 380 * If the shutdown was a clean halt, behave accordingly. 381 */ 382 static void 383 shutdown_halt(void *junk, int howto) 384 { 385 if (howto & RB_HALT) { 386 printf("\n"); 387 printf("The operating system has halted.\n"); 388 printf("Please press any key to reboot.\n\n"); 389 switch (cngetc()) { 390 case -1: /* No console, just die */ 391 cpu_halt(); 392 /* NOTREACHED */ 393 default: 394 howto &= ~RB_HALT; 395 break; 396 } 397 } 398 } 399 400 /* 401 * Check to see if the system paniced, pause and then reboot 402 * according to the specified delay. 403 */ 404 static void 405 shutdown_panic(void *junk, int howto) 406 { 407 int loop; 408 409 if (howto & RB_DUMP) { 410 if (PANIC_REBOOT_WAIT_TIME != 0) { 411 if (PANIC_REBOOT_WAIT_TIME != -1) { 412 printf("Automatic reboot in %d seconds - " 413 "press a key on the console to abort\n", 414 PANIC_REBOOT_WAIT_TIME); 415 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 416 loop > 0; --loop) { 417 DELAY(1000 * 100); /* 1/10th second */ 418 /* Did user type a key? */ 419 if (cncheckc() != -1) 420 break; 421 } 422 if (!loop) 423 return; 424 } 425 } else { /* zero time specified - reboot NOW */ 426 return; 427 } 428 printf("--> Press a key on the console to reboot,\n"); 429 printf("--> or switch off the system now.\n"); 430 cngetc(); 431 } 432 } 433 434 /* 435 * Everything done, now reset 436 */ 437 static void 438 shutdown_reset(void *junk, int howto) 439 { 440 printf("Rebooting...\n"); 441 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 442 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 443 cpu_reset(); 444 /* NOTREACHED */ /* assuming reset worked */ 445 } 446 447 /* 448 * Magic number for savecore 449 * 450 * exported (symorder) and used at least by savecore(8) 451 * 452 */ 453 static u_long const dumpmag = 0x8fca0101UL; 454 455 static int dumpsize = 0; /* also for savecore */ 456 457 static int dodump = 1; 458 459 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 460 "Try to perform coredump on kernel panic"); 461 462 static int 463 setdumpdev(dev) 464 dev_t dev; 465 { 466 int psize; 467 long newdumplo; 468 469 if (dev == NODEV) { 470 dumpdev = dev; 471 return (0); 472 } 473 psize = dev_dpsize(dev); 474 if (psize == -1) 475 return (ENXIO); 476 /* 477 * XXX should clean up checking in dumpsys() to be more like this. 478 */ 479 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 480 if (newdumplo <= LABELSECTOR) 481 return (ENOSPC); 482 dumpdev = dev; 483 dumplo = newdumplo; 484 return (0); 485 } 486 487 488 /* ARGSUSED */ 489 static void dump_conf (void *dummy); 490 static void 491 dump_conf(dummy) 492 void *dummy; 493 { 494 char *path; 495 dev_t dev; 496 497 path = malloc(MNAMELEN, M_TEMP, M_WAITOK); 498 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 499 dev = getdiskbyname(path); 500 if (dev != NODEV) 501 dumpdev = dev; 502 } 503 free(path, M_TEMP); 504 if (setdumpdev(dumpdev) != 0) 505 dumpdev = NODEV; 506 } 507 508 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 509 510 static int 511 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 512 { 513 int error; 514 udev_t ndumpdev; 515 516 ndumpdev = dev2udev(dumpdev); 517 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 518 if (error == 0 && req->newptr != NULL) 519 error = setdumpdev(udev2dev(ndumpdev, 0)); 520 return (error); 521 } 522 523 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 524 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 525 526 /* 527 * Doadump comes here after turning off memory management and 528 * getting on the dump stack, either when called above, or by 529 * the auto-restart code. 530 */ 531 static void 532 dumpsys(void) 533 { 534 int error; 535 536 savectx(&dumppcb); 537 dumpthread = curthread; 538 if (dumping++) { 539 printf("Dump already in progress, bailing...\n"); 540 return; 541 } 542 if (!dodump) 543 return; 544 if (dumpdev == NODEV) 545 return; 546 dumpsize = Maxmem; 547 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 548 printf("dump "); 549 error = dev_ddump(dumpdev); 550 if (error == 0) { 551 printf("succeeded\n"); 552 return; 553 } 554 printf("failed, reason: "); 555 switch (error) { 556 case ENOSYS: 557 case ENODEV: 558 printf("device doesn't support a dump routine\n"); 559 break; 560 561 case ENXIO: 562 printf("device bad\n"); 563 break; 564 565 case EFAULT: 566 printf("device not ready\n"); 567 break; 568 569 case EINVAL: 570 printf("area improper\n"); 571 break; 572 573 case EIO: 574 printf("i/o error\n"); 575 break; 576 577 case EINTR: 578 printf("aborted from console\n"); 579 break; 580 581 default: 582 printf("unknown, error = %d\n", error); 583 break; 584 } 585 } 586 587 int 588 dumpstatus(vm_offset_t addr, off_t count) 589 { 590 int c; 591 592 if (addr % (1024 * 1024) == 0) { 593 #ifdef HW_WDOG 594 if (wdog_tickler) 595 (*wdog_tickler)(); 596 #endif 597 printf("%ld ", (long)(count / (1024 * 1024))); 598 } 599 600 if ((c = cncheckc()) == 0x03) 601 return -1; 602 else if (c != -1) 603 printf("[CTRL-C to abort] "); 604 605 return 0; 606 } 607 608 /* 609 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 610 * and then reboots. If we are called twice, then we avoid trying to sync 611 * the disks as this often leads to recursive panics. 612 */ 613 void 614 panic(const char *fmt, ...) 615 { 616 int bootopt, newpanic; 617 __va_list ap; 618 static char buf[256]; 619 620 #ifdef SMP 621 /* 622 * If a panic occurs on multiple cpus before the first is able to 623 * halt the other cpus, only one cpu is allowed to take the panic. 624 * Attempt to be verbose about this situation but if the printf() 625 * itself panics don't let us overrun the kernel stack. 626 * 627 * Be very nasty about descheduling our thread at the lowest 628 * level possible in an attempt to freeze the thread without 629 * inducing further panics. 630 * 631 * Bumping gd_trap_nesting_level will also bypass assertions in 632 * lwkt_switch() and allow us to switch away even if we are a 633 * FAST interrupt or IPI. 634 */ 635 if (atomic_poll_acquire_int(&panic_cpu_interlock)) { 636 panic_cpu_gd = mycpu; 637 } else if (panic_cpu_gd != mycpu) { 638 crit_enter(); 639 ++mycpu->gd_trap_nesting_level; 640 if (mycpu->gd_trap_nesting_level < 25) { 641 printf("SECONDARY PANIC ON CPU %d THREAD %p\n", 642 mycpu->gd_cpuid, curthread); 643 } 644 curthread->td_release = NULL; /* be a grinch */ 645 for (;;) { 646 lwkt_deschedule_self(curthread); 647 lwkt_switch(); 648 } 649 /* NOT REACHED */ 650 /* --mycpu->gd_trap_nesting_level */ 651 /* crit_exit() */ 652 } 653 #endif 654 bootopt = RB_AUTOBOOT | RB_DUMP; 655 if (sync_on_panic == 0) 656 bootopt |= RB_NOSYNC; 657 newpanic = 0; 658 if (panicstr) 659 bootopt |= RB_NOSYNC; 660 else { 661 panicstr = fmt; 662 newpanic = 1; 663 } 664 665 __va_start(ap, fmt); 666 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 667 if (panicstr == fmt) 668 panicstr = buf; 669 __va_end(ap); 670 printf("panic: %s\n", buf); 671 #ifdef SMP 672 /* three separate prints in case of an unmapped page and trap */ 673 printf("mp_lock = %08x; ", mp_lock); 674 printf("cpuid = %d; ", mycpu->gd_cpuid); 675 printf("lapic.id = %08x\n", lapic.id); 676 #endif 677 678 #if defined(DDB) 679 if (newpanic && trace_on_panic) 680 db_print_backtrace(); 681 if (debugger_on_panic) 682 Debugger ("panic"); 683 #endif 684 boot(bootopt); 685 } 686 687 /* 688 * Support for poweroff delay. 689 */ 690 #ifndef POWEROFF_DELAY 691 # define POWEROFF_DELAY 5000 692 #endif 693 static int poweroff_delay = POWEROFF_DELAY; 694 695 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 696 &poweroff_delay, 0, ""); 697 698 static void 699 poweroff_wait(void *junk, int howto) 700 { 701 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 702 return; 703 DELAY(poweroff_delay * 1000); 704 } 705 706 /* 707 * Some system processes (e.g. syncer) need to be stopped at appropriate 708 * points in their main loops prior to a system shutdown, so that they 709 * won't interfere with the shutdown process (e.g. by holding a disk buf 710 * to cause sync to fail). For each of these system processes, register 711 * shutdown_kproc() as a handler for one of shutdown events. 712 */ 713 static int kproc_shutdown_wait = 60; 714 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 715 &kproc_shutdown_wait, 0, ""); 716 717 void 718 shutdown_kproc(void *arg, int howto) 719 { 720 struct thread *td; 721 struct proc *p; 722 int error; 723 724 if (panicstr) 725 return; 726 727 td = (struct thread *)arg; 728 if ((p = td->td_proc) != NULL) { 729 printf("Waiting (max %d seconds) for system process `%s' to stop...", 730 kproc_shutdown_wait, p->p_comm); 731 } else { 732 printf("Waiting (max %d seconds) for system thread %s to stop...", 733 kproc_shutdown_wait, td->td_comm); 734 } 735 error = suspend_kproc(td, kproc_shutdown_wait * hz); 736 737 if (error == EWOULDBLOCK) 738 printf("timed out\n"); 739 else 740 printf("stopped\n"); 741 } 742