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 1.26 2006/03/07 15:48:11 corecode 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); 145 146 /* register various local shutdown events */ 147 static void 148 shutdown_conf(void *unused) 149 { 150 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 151 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 152 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 153 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 154 } 155 156 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 157 158 /* ARGSUSED */ 159 160 /* 161 * The system call that results in a reboot 162 */ 163 int 164 reboot(struct reboot_args *uap) 165 { 166 struct thread *td = curthread; 167 int error; 168 169 if ((error = suser(td))) 170 return (error); 171 172 boot(uap->opt); 173 return (0); 174 } 175 176 /* 177 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 178 */ 179 static int shutdown_howto = 0; 180 181 void 182 shutdown_nice(int howto) 183 { 184 shutdown_howto = howto; 185 186 /* Send a signal to init(8) and have it shutdown the world */ 187 if (initproc != NULL) { 188 psignal(initproc, SIGINT); 189 } else { 190 /* No init(8) running, so simply reboot */ 191 boot(RB_NOSYNC); 192 } 193 return; 194 } 195 static int waittime = -1; 196 static struct thread *dumpthread; 197 static struct pcb dumppcb; 198 199 static void 200 print_uptime() 201 { 202 int f; 203 struct timespec ts; 204 205 getnanouptime(&ts); 206 printf("Uptime: "); 207 f = 0; 208 if (ts.tv_sec >= 86400) { 209 printf("%ldd", ts.tv_sec / 86400); 210 ts.tv_sec %= 86400; 211 f = 1; 212 } 213 if (f || ts.tv_sec >= 3600) { 214 printf("%ldh", ts.tv_sec / 3600); 215 ts.tv_sec %= 3600; 216 f = 1; 217 } 218 if (f || ts.tv_sec >= 60) { 219 printf("%ldm", ts.tv_sec / 60); 220 ts.tv_sec %= 60; 221 f = 1; 222 } 223 printf("%lds\n", ts.tv_sec); 224 } 225 226 /* 227 * Go through the rigmarole of shutting down.. 228 * this used to be in machdep.c but I'll be dammned if I could see 229 * anything machine dependant in it. 230 */ 231 static void 232 boot(int howto) 233 { 234 /* 235 * Get rid of any user scheduler baggage and then give 236 * us a high priority. 237 */ 238 if (curthread->td_release) 239 curthread->td_release(curthread); 240 lwkt_setpri_self(TDPRI_MAX); 241 242 /* collect extra flags that shutdown_nice might have set */ 243 howto |= shutdown_howto; 244 245 #ifdef SMP 246 /* 247 * We really want to shutdown on the BSP. Subsystems such as ACPI 248 * can't power-down the box otherwise. 249 */ 250 if (smp_active_mask > 1) { 251 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 252 } 253 if (panicstr == NULL && mycpu->gd_cpuid != 0) { 254 printf("Switching to cpu #0 for shutdown\n"); 255 lwkt_setcpu_self(globaldata_find(0)); 256 } 257 #endif 258 /* 259 * Do any callouts that should be done BEFORE syncing the filesystems. 260 */ 261 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 262 263 /* 264 * Now sync filesystems 265 */ 266 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 267 struct buf *bp; 268 int iter, nbusy, pbusy; 269 270 waittime = 0; 271 printf("\nsyncing disks... "); 272 273 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 274 275 /* 276 * With soft updates, some buffers that are 277 * written will be remarked as dirty until other 278 * buffers are written. 279 */ 280 for (iter = pbusy = 0; iter < 20; iter++) { 281 nbusy = 0; 282 for (bp = &buf[nbuf]; --bp >= buf; ) { 283 if ((bp->b_flags & B_INVAL) == 0 && 284 BUF_REFCNT(bp) > 0) { 285 nbusy++; 286 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 287 == B_DELWRI) { 288 /* bawrite(bp);*/ 289 nbusy++; 290 } 291 } 292 if (nbusy == 0) 293 break; 294 printf("%d ", nbusy); 295 if (nbusy < pbusy) 296 iter = 0; 297 pbusy = nbusy; 298 /* 299 * XXX: 300 * Process soft update work queue if buffers don't sync 301 * after 6 iterations by permitting the syncer to run. 302 */ 303 if (iter > 5 && bioops.io_sync) 304 (*bioops.io_sync)(NULL); 305 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 306 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); 307 } 308 printf("\n"); 309 /* 310 * Count only busy local buffers to prevent forcing 311 * a fsck if we're just a client of a wedged NFS server 312 */ 313 nbusy = 0; 314 for (bp = &buf[nbuf]; --bp >= buf; ) { 315 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 316 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 317 /* 318 * Only count buffers undergoing write I/O 319 * on the related vnode. 320 */ 321 if (bp->b_vp == NULL || 322 bp->b_vp->v_track_write.bk_active == 0) { 323 continue; 324 } 325 nbusy++; 326 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 327 printf( 328 "%p %d: dev:?, flags:%08lx, blkno:%ld, lblkno:%ld\n", 329 bp, nbusy, 330 bp->b_flags, (long)bp->b_bio1.bio_blkno, 331 (long)bp->b_lblkno); 332 #endif 333 } 334 } 335 if (nbusy) { 336 /* 337 * Failed to sync all blocks. Indicate this and don't 338 * unmount filesystems (thus forcing an fsck on reboot). 339 */ 340 printf("giving up on %d buffers\n", nbusy); 341 #ifdef DDB 342 Debugger("busy buffer problem"); 343 #endif /* DDB */ 344 tsleep(boot, 0, "shutdn", hz * 5 + 1); 345 } else { 346 printf("done\n"); 347 /* 348 * Unmount filesystems 349 */ 350 if (panicstr == 0) 351 vfs_unmountall(); 352 } 353 tsleep(boot, 0, "shutdn", hz / 10 + 1); 354 } 355 356 print_uptime(); 357 358 /* 359 * Ok, now do things that assume all filesystem activity has 360 * been completed. 361 */ 362 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 363 crit_enter(); 364 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 365 dumpsys(); 366 367 /* Now that we're going to really halt the system... */ 368 EVENTHANDLER_INVOKE(shutdown_final, howto); 369 370 for(;;) ; /* safety against shutdown_reset not working */ 371 /* NOTREACHED */ 372 } 373 374 /* 375 * If the shutdown was a clean halt, behave accordingly. 376 */ 377 static void 378 shutdown_halt(void *junk, int howto) 379 { 380 if (howto & RB_HALT) { 381 printf("\n"); 382 printf("The operating system has halted.\n"); 383 printf("Please press any key to reboot.\n\n"); 384 switch (cngetc()) { 385 case -1: /* No console, just die */ 386 cpu_halt(); 387 /* NOTREACHED */ 388 default: 389 howto &= ~RB_HALT; 390 break; 391 } 392 } 393 } 394 395 /* 396 * Check to see if the system paniced, pause and then reboot 397 * according to the specified delay. 398 */ 399 static void 400 shutdown_panic(void *junk, int howto) 401 { 402 int loop; 403 404 if (howto & RB_DUMP) { 405 if (PANIC_REBOOT_WAIT_TIME != 0) { 406 if (PANIC_REBOOT_WAIT_TIME != -1) { 407 printf("Automatic reboot in %d seconds - " 408 "press a key on the console to abort\n", 409 PANIC_REBOOT_WAIT_TIME); 410 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 411 loop > 0; --loop) { 412 DELAY(1000 * 100); /* 1/10th second */ 413 /* Did user type a key? */ 414 if (cncheckc() != -1) 415 break; 416 } 417 if (!loop) 418 return; 419 } 420 } else { /* zero time specified - reboot NOW */ 421 return; 422 } 423 printf("--> Press a key on the console to reboot,\n"); 424 printf("--> or switch off the system now.\n"); 425 cngetc(); 426 } 427 } 428 429 /* 430 * Everything done, now reset 431 */ 432 static void 433 shutdown_reset(void *junk, int howto) 434 { 435 printf("Rebooting...\n"); 436 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 437 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 438 cpu_reset(); 439 /* NOTREACHED */ /* assuming reset worked */ 440 } 441 442 /* 443 * Magic number for savecore 444 * 445 * exported (symorder) and used at least by savecore(8) 446 * 447 */ 448 static u_long const dumpmag = 0x8fca0101UL; 449 450 static int dumpsize = 0; /* also for savecore */ 451 452 static int dodump = 1; 453 454 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 455 "Try to perform coredump on kernel panic"); 456 457 static int 458 setdumpdev(dev) 459 dev_t dev; 460 { 461 int psize; 462 long newdumplo; 463 464 if (dev == NODEV) { 465 dumpdev = dev; 466 return (0); 467 } 468 psize = dev_dpsize(dev); 469 if (psize == -1) 470 return (ENXIO); 471 /* 472 * XXX should clean up checking in dumpsys() to be more like this. 473 */ 474 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 475 if (newdumplo <= LABELSECTOR) 476 return (ENOSPC); 477 dumpdev = dev; 478 dumplo = newdumplo; 479 return (0); 480 } 481 482 483 /* ARGSUSED */ 484 static void dump_conf (void *dummy); 485 static void 486 dump_conf(dummy) 487 void *dummy; 488 { 489 char *path; 490 dev_t dev; 491 492 path = malloc(MNAMELEN, M_TEMP, M_WAITOK); 493 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 494 dev = getdiskbyname(path); 495 if (dev != NODEV) 496 dumpdev = dev; 497 } 498 free(path, M_TEMP); 499 if (setdumpdev(dumpdev) != 0) 500 dumpdev = NODEV; 501 } 502 503 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 504 505 static int 506 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 507 { 508 int error; 509 udev_t ndumpdev; 510 511 ndumpdev = dev2udev(dumpdev); 512 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 513 if (error == 0 && req->newptr != NULL) 514 error = setdumpdev(udev2dev(ndumpdev, 0)); 515 return (error); 516 } 517 518 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 519 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 520 521 /* 522 * Doadump comes here after turning off memory management and 523 * getting on the dump stack, either when called above, or by 524 * the auto-restart code. 525 */ 526 static void 527 dumpsys(void) 528 { 529 int error; 530 531 savectx(&dumppcb); 532 dumpthread = curthread; 533 if (dumping++) { 534 printf("Dump already in progress, bailing...\n"); 535 return; 536 } 537 if (!dodump) 538 return; 539 if (dumpdev == NODEV) 540 return; 541 dumpsize = Maxmem; 542 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 543 printf("dump "); 544 error = dev_ddump(dumpdev); 545 if (error == 0) { 546 printf("succeeded\n"); 547 return; 548 } 549 printf("failed, reason: "); 550 switch (error) { 551 case ENOSYS: 552 case ENODEV: 553 printf("device doesn't support a dump routine\n"); 554 break; 555 556 case ENXIO: 557 printf("device bad\n"); 558 break; 559 560 case EFAULT: 561 printf("device not ready\n"); 562 break; 563 564 case EINVAL: 565 printf("area improper\n"); 566 break; 567 568 case EIO: 569 printf("i/o error\n"); 570 break; 571 572 case EINTR: 573 printf("aborted from console\n"); 574 break; 575 576 default: 577 printf("unknown, error = %d\n", error); 578 break; 579 } 580 } 581 582 int 583 dumpstatus(vm_offset_t addr, off_t count) 584 { 585 int c; 586 587 if (addr % (1024 * 1024) == 0) { 588 #ifdef HW_WDOG 589 if (wdog_tickler) 590 (*wdog_tickler)(); 591 #endif 592 printf("%ld ", (long)(count / (1024 * 1024))); 593 } 594 595 if ((c = cncheckc()) == 0x03) 596 return -1; 597 else if (c != -1) 598 printf("[CTRL-C to abort] "); 599 600 return 0; 601 } 602 603 /* 604 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 605 * and then reboots. If we are called twice, then we avoid trying to sync 606 * the disks as this often leads to recursive panics. 607 */ 608 void 609 panic(const char *fmt, ...) 610 { 611 int bootopt, newpanic; 612 __va_list ap; 613 static char buf[256]; 614 615 #ifdef SMP 616 /* 617 * If a panic occurs on multiple cpus before the first is able to 618 * halt the other cpus, only one cpu is allowed to take the panic. 619 * Attempt to be verbose about this situation but if the printf() 620 * itself panics don't let us overrun the kernel stack. 621 * 622 * Be very nasty about descheduling our thread at the lowest 623 * level possible in an attempt to freeze the thread without 624 * inducing further panics. 625 * 626 * Bumping gd_trap_nesting_level will also bypass assertions in 627 * lwkt_switch() and allow us to switch away even if we are a 628 * FAST interrupt or IPI. 629 */ 630 if (atomic_poll_acquire_int(&panic_cpu_interlock)) { 631 panic_cpu_gd = mycpu; 632 } else if (panic_cpu_gd != mycpu) { 633 crit_enter(); 634 ++mycpu->gd_trap_nesting_level; 635 if (mycpu->gd_trap_nesting_level < 25) { 636 printf("SECONDARY PANIC ON CPU %d THREAD %p\n", 637 mycpu->gd_cpuid, curthread); 638 } 639 curthread->td_release = NULL; /* be a grinch */ 640 for (;;) { 641 lwkt_deschedule_self(curthread); 642 lwkt_switch(); 643 } 644 /* NOT REACHED */ 645 /* --mycpu->gd_trap_nesting_level */ 646 /* crit_exit() */ 647 } 648 #endif 649 bootopt = RB_AUTOBOOT | RB_DUMP; 650 if (sync_on_panic == 0) 651 bootopt |= RB_NOSYNC; 652 newpanic = 0; 653 if (panicstr) 654 bootopt |= RB_NOSYNC; 655 else { 656 panicstr = fmt; 657 newpanic = 1; 658 } 659 660 __va_start(ap, fmt); 661 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 662 if (panicstr == fmt) 663 panicstr = buf; 664 __va_end(ap); 665 printf("panic: %s\n", buf); 666 #ifdef SMP 667 /* three separate prints in case of an unmapped page and trap */ 668 printf("mp_lock = %08x; ", mp_lock); 669 printf("cpuid = %d; ", mycpu->gd_cpuid); 670 printf("lapic.id = %08x\n", lapic.id); 671 #endif 672 673 #if defined(DDB) 674 if (newpanic && trace_on_panic) 675 db_print_backtrace(); 676 if (debugger_on_panic) 677 Debugger ("panic"); 678 #endif 679 boot(bootopt); 680 } 681 682 /* 683 * Support for poweroff delay. 684 */ 685 #ifndef POWEROFF_DELAY 686 # define POWEROFF_DELAY 5000 687 #endif 688 static int poweroff_delay = POWEROFF_DELAY; 689 690 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 691 &poweroff_delay, 0, ""); 692 693 static void 694 poweroff_wait(void *junk, int howto) 695 { 696 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 697 return; 698 DELAY(poweroff_delay * 1000); 699 } 700 701 /* 702 * Some system processes (e.g. syncer) need to be stopped at appropriate 703 * points in their main loops prior to a system shutdown, so that they 704 * won't interfere with the shutdown process (e.g. by holding a disk buf 705 * to cause sync to fail). For each of these system processes, register 706 * shutdown_kproc() as a handler for one of shutdown events. 707 */ 708 static int kproc_shutdown_wait = 60; 709 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 710 &kproc_shutdown_wait, 0, ""); 711 712 void 713 shutdown_kproc(void *arg, int howto) 714 { 715 struct thread *td; 716 struct proc *p; 717 int error; 718 719 if (panicstr) 720 return; 721 722 td = (struct thread *)arg; 723 if ((p = td->td_proc) != NULL) { 724 printf("Waiting (max %d seconds) for system process `%s' to stop...", 725 kproc_shutdown_wait, p->p_comm); 726 } else { 727 printf("Waiting (max %d seconds) for system thread %s to stop...", 728 kproc_shutdown_wait, td->td_comm); 729 } 730 error = suspend_kproc(td, kproc_shutdown_wait * hz); 731 732 if (error == EWOULDBLOCK) 733 printf("timed out\n"); 734 else 735 printf("stopped\n"); 736 } 737