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 1.25 2006/02/21 17:36:38 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); 145 146 /* 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 pcb dumppcb; 197 198 static void 199 print_uptime() 200 { 201 int f; 202 struct timespec ts; 203 204 getnanouptime(&ts); 205 printf("Uptime: "); 206 f = 0; 207 if (ts.tv_sec >= 86400) { 208 printf("%ldd", ts.tv_sec / 86400); 209 ts.tv_sec %= 86400; 210 f = 1; 211 } 212 if (f || ts.tv_sec >= 3600) { 213 printf("%ldh", ts.tv_sec / 3600); 214 ts.tv_sec %= 3600; 215 f = 1; 216 } 217 if (f || ts.tv_sec >= 60) { 218 printf("%ldm", ts.tv_sec / 60); 219 ts.tv_sec %= 60; 220 f = 1; 221 } 222 printf("%lds\n", ts.tv_sec); 223 } 224 225 /* 226 * Go through the rigmarole of shutting down.. 227 * this used to be in machdep.c but I'll be dammned if I could see 228 * anything machine dependant in it. 229 */ 230 static void 231 boot(int howto) 232 { 233 /* 234 * Get rid of any user scheduler baggage and then give 235 * us a high priority. 236 */ 237 if (curthread->td_release) 238 curthread->td_release(curthread); 239 lwkt_setpri_self(TDPRI_MAX); 240 241 /* collect extra flags that shutdown_nice might have set */ 242 howto |= shutdown_howto; 243 244 #ifdef SMP 245 /* 246 * We really want to shutdown on the BSP. Subsystems such as ACPI 247 * can't power-down the box otherwise. 248 */ 249 if (smp_active_mask > 1) { 250 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 251 } 252 if (panicstr == NULL && mycpu->gd_cpuid != 0) { 253 printf("Switching to cpu #0 for shutdown\n"); 254 lwkt_setcpu_self(globaldata_find(0)); 255 } 256 #endif 257 /* 258 * Do any callouts that should be done BEFORE syncing the filesystems. 259 */ 260 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 261 262 /* 263 * Now sync filesystems 264 */ 265 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 266 struct buf *bp; 267 int iter, nbusy, pbusy; 268 269 waittime = 0; 270 printf("\nsyncing disks... "); 271 272 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 273 274 /* 275 * With soft updates, some buffers that are 276 * written will be remarked as dirty until other 277 * buffers are written. 278 */ 279 for (iter = pbusy = 0; iter < 20; iter++) { 280 nbusy = 0; 281 for (bp = &buf[nbuf]; --bp >= buf; ) { 282 if ((bp->b_flags & B_INVAL) == 0 && 283 BUF_REFCNT(bp) > 0) { 284 nbusy++; 285 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 286 == B_DELWRI) { 287 /* bawrite(bp);*/ 288 nbusy++; 289 } 290 } 291 if (nbusy == 0) 292 break; 293 printf("%d ", nbusy); 294 if (nbusy < pbusy) 295 iter = 0; 296 pbusy = nbusy; 297 /* 298 * XXX: 299 * Process soft update work queue if buffers don't sync 300 * after 6 iterations by permitting the syncer to run. 301 */ 302 if (iter > 5 && bioops.io_sync) 303 (*bioops.io_sync)(NULL); 304 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 305 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); 306 } 307 printf("\n"); 308 /* 309 * Count only busy local buffers to prevent forcing 310 * a fsck if we're just a client of a wedged NFS server 311 */ 312 nbusy = 0; 313 for (bp = &buf[nbuf]; --bp >= buf; ) { 314 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 315 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 316 /* 317 * Only count buffers undergoing write I/O 318 * on the related vnode. 319 */ 320 if (bp->b_vp == NULL || 321 bp->b_vp->v_track_write.bk_active == 0) { 322 continue; 323 } 324 nbusy++; 325 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 326 printf( 327 "%p %d: dev:?, flags:%08lx, blkno:%ld, lblkno:%ld\n", 328 bp, nbusy, 329 bp->b_flags, (long)bp->b_bio1.bio_blkno, 330 (long)bp->b_lblkno); 331 #endif 332 } 333 } 334 if (nbusy) { 335 /* 336 * Failed to sync all blocks. Indicate this and don't 337 * unmount filesystems (thus forcing an fsck on reboot). 338 */ 339 printf("giving up on %d buffers\n", nbusy); 340 #ifdef DDB 341 Debugger("busy buffer problem"); 342 #endif /* DDB */ 343 tsleep(boot, 0, "shutdn", hz * 5 + 1); 344 } else { 345 printf("done\n"); 346 /* 347 * Unmount filesystems 348 */ 349 if (panicstr == 0) 350 vfs_unmountall(); 351 } 352 tsleep(boot, 0, "shutdn", hz / 10 + 1); 353 } 354 355 print_uptime(); 356 357 /* 358 * Ok, now do things that assume all filesystem activity has 359 * been completed. 360 */ 361 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 362 crit_enter(); 363 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 364 dumpsys(); 365 366 /* Now that we're going to really halt the system... */ 367 EVENTHANDLER_INVOKE(shutdown_final, howto); 368 369 for(;;) ; /* safety against shutdown_reset not working */ 370 /* NOTREACHED */ 371 } 372 373 /* 374 * If the shutdown was a clean halt, behave accordingly. 375 */ 376 static void 377 shutdown_halt(void *junk, int howto) 378 { 379 if (howto & RB_HALT) { 380 printf("\n"); 381 printf("The operating system has halted.\n"); 382 printf("Please press any key to reboot.\n\n"); 383 switch (cngetc()) { 384 case -1: /* No console, just die */ 385 cpu_halt(); 386 /* NOTREACHED */ 387 default: 388 howto &= ~RB_HALT; 389 break; 390 } 391 } 392 } 393 394 /* 395 * Check to see if the system paniced, pause and then reboot 396 * according to the specified delay. 397 */ 398 static void 399 shutdown_panic(void *junk, int howto) 400 { 401 int loop; 402 403 if (howto & RB_DUMP) { 404 if (PANIC_REBOOT_WAIT_TIME != 0) { 405 if (PANIC_REBOOT_WAIT_TIME != -1) { 406 printf("Automatic reboot in %d seconds - " 407 "press a key on the console to abort\n", 408 PANIC_REBOOT_WAIT_TIME); 409 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 410 loop > 0; --loop) { 411 DELAY(1000 * 100); /* 1/10th second */ 412 /* Did user type a key? */ 413 if (cncheckc() != -1) 414 break; 415 } 416 if (!loop) 417 return; 418 } 419 } else { /* zero time specified - reboot NOW */ 420 return; 421 } 422 printf("--> Press a key on the console to reboot,\n"); 423 printf("--> or switch off the system now.\n"); 424 cngetc(); 425 } 426 } 427 428 /* 429 * Everything done, now reset 430 */ 431 static void 432 shutdown_reset(void *junk, int howto) 433 { 434 printf("Rebooting...\n"); 435 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 436 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 437 cpu_reset(); 438 /* NOTREACHED */ /* assuming reset worked */ 439 } 440 441 /* 442 * Magic number for savecore 443 * 444 * exported (symorder) and used at least by savecore(8) 445 * 446 */ 447 static u_long const dumpmag = 0x8fca0101UL; 448 449 static int dumpsize = 0; /* also for savecore */ 450 451 static int dodump = 1; 452 453 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 454 "Try to perform coredump on kernel panic"); 455 456 static int 457 setdumpdev(dev) 458 dev_t dev; 459 { 460 int psize; 461 long newdumplo; 462 463 if (dev == NODEV) { 464 dumpdev = dev; 465 return (0); 466 } 467 psize = dev_dpsize(dev); 468 if (psize == -1) 469 return (ENXIO); 470 /* 471 * XXX should clean up checking in dumpsys() to be more like this. 472 */ 473 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 474 if (newdumplo <= LABELSECTOR) 475 return (ENOSPC); 476 dumpdev = dev; 477 dumplo = newdumplo; 478 return (0); 479 } 480 481 482 /* ARGSUSED */ 483 static void dump_conf (void *dummy); 484 static void 485 dump_conf(dummy) 486 void *dummy; 487 { 488 char *path; 489 dev_t dev; 490 491 path = malloc(MNAMELEN, M_TEMP, M_WAITOK); 492 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 493 dev = getdiskbyname(path); 494 if (dev != NODEV) 495 dumpdev = dev; 496 } 497 free(path, M_TEMP); 498 if (setdumpdev(dumpdev) != 0) 499 dumpdev = NODEV; 500 } 501 502 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 503 504 static int 505 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 506 { 507 int error; 508 udev_t ndumpdev; 509 510 ndumpdev = dev2udev(dumpdev); 511 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 512 if (error == 0 && req->newptr != NULL) 513 error = setdumpdev(udev2dev(ndumpdev, 0)); 514 return (error); 515 } 516 517 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 518 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 519 520 /* 521 * Doadump comes here after turning off memory management and 522 * getting on the dump stack, either when called above, or by 523 * the auto-restart code. 524 */ 525 static void 526 dumpsys(void) 527 { 528 int error; 529 530 savectx(&dumppcb); 531 if (dumping++) { 532 printf("Dump already in progress, bailing...\n"); 533 return; 534 } 535 if (!dodump) 536 return; 537 if (dumpdev == NODEV) 538 return; 539 dumpsize = Maxmem; 540 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 541 printf("dump "); 542 error = dev_ddump(dumpdev); 543 if (error == 0) { 544 printf("succeeded\n"); 545 return; 546 } 547 printf("failed, reason: "); 548 switch (error) { 549 case ENOSYS: 550 case ENODEV: 551 printf("device doesn't support a dump routine\n"); 552 break; 553 554 case ENXIO: 555 printf("device bad\n"); 556 break; 557 558 case EFAULT: 559 printf("device not ready\n"); 560 break; 561 562 case EINVAL: 563 printf("area improper\n"); 564 break; 565 566 case EIO: 567 printf("i/o error\n"); 568 break; 569 570 case EINTR: 571 printf("aborted from console\n"); 572 break; 573 574 default: 575 printf("unknown, error = %d\n", error); 576 break; 577 } 578 } 579 580 int 581 dumpstatus(vm_offset_t addr, off_t count) 582 { 583 int c; 584 585 if (addr % (1024 * 1024) == 0) { 586 #ifdef HW_WDOG 587 if (wdog_tickler) 588 (*wdog_tickler)(); 589 #endif 590 printf("%ld ", (long)(count / (1024 * 1024))); 591 } 592 593 if ((c = cncheckc()) == 0x03) 594 return -1; 595 else if (c != -1) 596 printf("[CTRL-C to abort] "); 597 598 return 0; 599 } 600 601 /* 602 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 603 * and then reboots. If we are called twice, then we avoid trying to sync 604 * the disks as this often leads to recursive panics. 605 */ 606 void 607 panic(const char *fmt, ...) 608 { 609 int bootopt, newpanic; 610 __va_list ap; 611 static char buf[256]; 612 613 #ifdef SMP 614 /* 615 * If a panic occurs on multiple cpus before the first is able to 616 * halt the other cpus, only one cpu is allowed to take the panic. 617 * Attempt to be verbose about this situation but if the printf() 618 * itself panics don't let us overrun the kernel stack. 619 * 620 * Be very nasty about descheduling our thread at the lowest 621 * level possible in an attempt to freeze the thread without 622 * inducing further panics. 623 * 624 * Bumping gd_trap_nesting_level will also bypass assertions in 625 * lwkt_switch() and allow us to switch away even if we are a 626 * FAST interrupt or IPI. 627 */ 628 if (atomic_poll_acquire_int(&panic_cpu_interlock)) { 629 panic_cpu_gd = mycpu; 630 } else if (panic_cpu_gd != mycpu) { 631 crit_enter(); 632 ++mycpu->gd_trap_nesting_level; 633 if (mycpu->gd_trap_nesting_level < 25) { 634 printf("SECONDARY PANIC ON CPU %d THREAD %p\n", 635 mycpu->gd_cpuid, curthread); 636 } 637 curthread->td_release = NULL; /* be a grinch */ 638 for (;;) { 639 lwkt_deschedule_self(curthread); 640 lwkt_switch(); 641 } 642 /* NOT REACHED */ 643 /* --mycpu->gd_trap_nesting_level */ 644 /* crit_exit() */ 645 } 646 #endif 647 bootopt = RB_AUTOBOOT | RB_DUMP; 648 if (sync_on_panic == 0) 649 bootopt |= RB_NOSYNC; 650 newpanic = 0; 651 if (panicstr) 652 bootopt |= RB_NOSYNC; 653 else { 654 panicstr = fmt; 655 newpanic = 1; 656 } 657 658 __va_start(ap, fmt); 659 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 660 if (panicstr == fmt) 661 panicstr = buf; 662 __va_end(ap); 663 printf("panic: %s\n", buf); 664 #ifdef SMP 665 /* three separate prints in case of an unmapped page and trap */ 666 printf("mp_lock = %08x; ", mp_lock); 667 printf("cpuid = %d; ", mycpu->gd_cpuid); 668 printf("lapic.id = %08x\n", lapic.id); 669 #endif 670 671 #if defined(DDB) 672 if (newpanic && trace_on_panic) 673 db_print_backtrace(); 674 if (debugger_on_panic) 675 Debugger ("panic"); 676 #endif 677 boot(bootopt); 678 } 679 680 /* 681 * Support for poweroff delay. 682 */ 683 #ifndef POWEROFF_DELAY 684 # define POWEROFF_DELAY 5000 685 #endif 686 static int poweroff_delay = POWEROFF_DELAY; 687 688 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 689 &poweroff_delay, 0, ""); 690 691 static void 692 poweroff_wait(void *junk, int howto) 693 { 694 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 695 return; 696 DELAY(poweroff_delay * 1000); 697 } 698 699 /* 700 * Some system processes (e.g. syncer) need to be stopped at appropriate 701 * points in their main loops prior to a system shutdown, so that they 702 * won't interfere with the shutdown process (e.g. by holding a disk buf 703 * to cause sync to fail). For each of these system processes, register 704 * shutdown_kproc() as a handler for one of shutdown events. 705 */ 706 static int kproc_shutdown_wait = 60; 707 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 708 &kproc_shutdown_wait, 0, ""); 709 710 void 711 shutdown_kproc(void *arg, int howto) 712 { 713 struct thread *td; 714 struct proc *p; 715 int error; 716 717 if (panicstr) 718 return; 719 720 td = (struct thread *)arg; 721 if ((p = td->td_proc) != NULL) { 722 printf("Waiting (max %d seconds) for system process `%s' to stop...", 723 kproc_shutdown_wait, p->p_comm); 724 } else { 725 printf("Waiting (max %d seconds) for system thread %s to stop...", 726 kproc_shutdown_wait, td->td_comm); 727 } 728 error = suspend_kproc(td, kproc_shutdown_wait * hz); 729 730 if (error == EWOULDBLOCK) 731 printf("timed out\n"); 732 else 733 printf("stopped\n"); 734 } 735