1 /* $OpenBSD: init_main.c,v 1.163 2009/11/27 20:05:50 guenther Exp $ */ 2 /* $NetBSD: init_main.c,v 1.84.4.1 1996/06/02 09:08:06 mrg Exp $ */ 3 4 /* 5 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 6 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * (c) UNIX System Laboratories, Inc. 9 * All or some portions of this file are derived from material licensed 10 * to the University of California by American Telephone and Telegraph 11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 12 * the permission of UNIX System Laboratories, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. 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 * @(#)init_main.c 8.9 (Berkeley) 1/21/94 39 */ 40 41 #include <sys/param.h> 42 #include <sys/core.h> 43 #include <sys/filedesc.h> 44 #include <sys/file.h> 45 #include <sys/errno.h> 46 #include <sys/exec.h> 47 #include <sys/kernel.h> 48 #include <sys/kthread.h> 49 #include <sys/mount.h> 50 #include <sys/proc.h> 51 #include <sys/resourcevar.h> 52 #include <sys/signalvar.h> 53 #include <sys/systm.h> 54 #include <sys/namei.h> 55 #include <sys/vnode.h> 56 #include <sys/tty.h> 57 #include <sys/conf.h> 58 #include <sys/buf.h> 59 #include <sys/device.h> 60 #include <sys/socketvar.h> 61 #include <sys/lockf.h> 62 #include <sys/protosw.h> 63 #include <sys/reboot.h> 64 #include <sys/user.h> 65 #ifdef SYSVSHM 66 #include <sys/shm.h> 67 #endif 68 #ifdef SYSVSEM 69 #include <sys/sem.h> 70 #endif 71 #ifdef SYSVMSG 72 #include <sys/msg.h> 73 #endif 74 #include <sys/domain.h> 75 #include <sys/mbuf.h> 76 #include <sys/pipe.h> 77 #include <sys/workq.h> 78 79 #include <sys/syscall.h> 80 #include <sys/syscallargs.h> 81 82 #include <dev/rndvar.h> 83 84 #include <ufs/ufs/quota.h> 85 86 #include <machine/cpu.h> 87 88 #include <uvm/uvm.h> 89 90 #include <net/if.h> 91 #include <net/raw_cb.h> 92 93 #if defined(CRYPTO) 94 #include <crypto/cryptodev.h> 95 #include <crypto/cryptosoft.h> 96 #endif 97 98 #if defined(NFSSERVER) || defined(NFSCLIENT) 99 extern void nfs_init(void); 100 #endif 101 102 #include "mpath.h" 103 #include "vscsi.h" 104 #include "softraid.h" 105 106 const char copyright[] = 107 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 108 "\tThe Regents of the University of California. All rights reserved.\n" 109 "Copyright (c) 1995-2009 OpenBSD. All rights reserved. http://www.OpenBSD.org\n"; 110 111 /* Components of the first process -- never freed. */ 112 struct session session0; 113 struct pgrp pgrp0; 114 struct proc proc0; 115 struct process process0; 116 struct pcred cred0; 117 struct plimit limit0; 118 struct vmspace vmspace0; 119 struct sigacts sigacts0; 120 struct proc *initproc; 121 122 int cmask = CMASK; 123 extern struct user *proc0paddr; 124 125 struct vnode *rootvp, *swapdev_vp; 126 int boothowto; 127 struct timeval boottime; 128 int ncpus = 1; 129 int ncpusfound = 1; /* number of cpus we find */ 130 __volatile int start_init_exec; /* semaphore for start_init() */ 131 132 #if !defined(NO_PROPOLICE) 133 long __guard[8]; 134 #endif 135 136 /* XXX return int so gcc -Werror won't complain */ 137 int main(void *); 138 void check_console(struct proc *); 139 void start_init(void *); 140 void start_cleaner(void *); 141 void start_update(void *); 142 void start_reaper(void *); 143 void init_crypto(void); 144 void init_exec(void); 145 void kqueue_init(void); 146 void workq_init(void); 147 148 extern char sigcode[], esigcode[]; 149 #ifdef SYSCALL_DEBUG 150 extern char *syscallnames[]; 151 #endif 152 153 struct emul emul_native = { 154 "native", 155 NULL, 156 sendsig, 157 SYS_syscall, 158 SYS_MAXSYSCALL, 159 sysent, 160 #ifdef SYSCALL_DEBUG 161 syscallnames, 162 #else 163 NULL, 164 #endif 165 0, 166 copyargs, 167 setregs, 168 NULL, 169 coredump_trad, 170 sigcode, 171 esigcode, 172 EMUL_ENABLED | EMUL_NATIVE, 173 }; 174 175 176 /* 177 * System startup; initialize the world, create process 0, mount root 178 * filesystem, and fork to create init and pagedaemon. Most of the 179 * hard work is done in the lower-level initialization routines including 180 * startup(), which does memory initialization and autoconfiguration. 181 */ 182 /* XXX return int, so gcc -Werror won't complain */ 183 int 184 main(void *framep) 185 { 186 struct proc *p; 187 struct pdevinit *pdev; 188 struct timeval rtv; 189 quad_t lim; 190 int s, i; 191 extern struct pdevinit pdevinit[]; 192 extern void scheduler_start(void); 193 extern void disk_init(void); 194 extern void endtsleep(void *); 195 extern void realitexpire(void *); 196 197 /* 198 * Initialize the current process pointer (curproc) before 199 * any possible traps/probes to simplify trap processing. 200 */ 201 curproc = p = &proc0; 202 p->p_cpu = curcpu(); 203 204 /* 205 * Initialize timeouts. 206 */ 207 timeout_startup(); 208 209 /* 210 * Attempt to find console and initialize 211 * in case of early panic or other messages. 212 */ 213 config_init(); /* init autoconfiguration data structures */ 214 consinit(); 215 216 printf("%s\n", copyright); 217 218 KERNEL_LOCK_INIT(); 219 220 uvm_init(); 221 disk_init(); /* must come before autoconfiguration */ 222 tty_init(); /* initialise tty's */ 223 cpu_startup(); 224 225 /* 226 * Initialize mbuf's. Do this now because we might attempt to 227 * allocate mbufs or mbuf clusters during autoconfiguration. 228 */ 229 mbinit(); 230 231 /* Initialize sockets. */ 232 soinit(); 233 234 /* 235 * Initialize process and pgrp structures. 236 */ 237 procinit(); 238 239 /* Initialize file locking. */ 240 lf_init(); 241 242 /* 243 * Initialize filedescriptors. 244 */ 245 filedesc_init(); 246 247 /* 248 * Initialize pipes. 249 */ 250 pipe_init(); 251 252 /* 253 * Initialize kqueues. 254 */ 255 kqueue_init(); 256 257 /* 258 * Create process 0 (the swapper). 259 */ 260 261 process0.ps_mainproc = p; 262 TAILQ_INIT(&process0.ps_threads); 263 TAILQ_INSERT_TAIL(&process0.ps_threads, p, p_thr_link); 264 process0.ps_refcnt = 1; 265 p->p_p = &process0; 266 267 LIST_INSERT_HEAD(&allproc, p, p_list); 268 p->p_pgrp = &pgrp0; 269 LIST_INSERT_HEAD(PIDHASH(0), p, p_hash); 270 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 271 LIST_INIT(&pgrp0.pg_members); 272 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 273 274 pgrp0.pg_session = &session0; 275 session0.s_count = 1; 276 session0.s_leader = p; 277 278 atomic_setbits_int(&p->p_flag, P_SYSTEM | P_NOCLDWAIT); 279 p->p_stat = SONPROC; 280 p->p_nice = NZERO; 281 p->p_emul = &emul_native; 282 bcopy("swapper", p->p_comm, sizeof ("swapper")); 283 284 /* Init timeouts. */ 285 timeout_set(&p->p_sleep_to, endtsleep, p); 286 timeout_set(&p->p_realit_to, realitexpire, p); 287 288 /* Create credentials. */ 289 cred0.p_refcnt = 1; 290 p->p_cred = &cred0; 291 p->p_ucred = crget(); 292 p->p_ucred->cr_ngroups = 1; /* group 0 */ 293 294 /* Initialize signal state for process 0. */ 295 signal_init(); 296 p->p_sigacts = &sigacts0; 297 siginit(p); 298 299 /* Create the file descriptor table. */ 300 p->p_fd = fdinit(NULL); 301 302 /* Create the limits structures. */ 303 p->p_p->ps_limit = &limit0; 304 for (i = 0; i < nitems(p->p_rlimit); i++) 305 limit0.pl_rlimit[i].rlim_cur = 306 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 307 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = NOFILE; 308 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = MIN(NOFILE_MAX, 309 (maxfiles - NOFILE > NOFILE) ? maxfiles - NOFILE : NOFILE); 310 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = MAXUPRC; 311 lim = ptoa(uvmexp.free); 312 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 313 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 314 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 315 limit0.p_refcnt = 1; 316 317 /* Set the default routing domain. */ 318 p->p_rdomain = 0; 319 320 /* Allocate a prototype map so we have something to fork. */ 321 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 322 trunc_page(VM_MAX_ADDRESS), TRUE, TRUE); 323 p->p_vmspace = &vmspace0; 324 325 p->p_addr = proc0paddr; /* XXX */ 326 327 /* 328 * We continue to place resource usage info in the 329 * user struct so they're pageable. 330 */ 331 p->p_stats = &p->p_addr->u_stats; 332 333 /* 334 * Charge root for one process. 335 */ 336 (void)chgproccnt(0, 1); 337 338 /* Initialize run queues */ 339 sched_init_runqueues(); 340 sleep_queue_init(); 341 sched_init_cpu(curcpu()); 342 343 /* Initialize work queues */ 344 workq_init(); 345 346 /* Configure the devices */ 347 cpu_configure(); 348 349 /* Configure virtual memory system, set vm rlimits. */ 350 uvm_init_limits(p); 351 352 /* Initialize the file systems. */ 353 #if defined(NFSSERVER) || defined(NFSCLIENT) 354 nfs_init(); /* initialize server/shared data */ 355 #endif 356 vfsinit(); 357 358 /* Start real time and statistics clocks. */ 359 initclocks(); 360 361 /* Lock the kernel on behalf of proc0. */ 362 KERNEL_PROC_LOCK(p); 363 364 #ifdef SYSVSHM 365 /* Initialize System V style shared memory. */ 366 shminit(); 367 #endif 368 369 #ifdef SYSVSEM 370 /* Initialize System V style semaphores. */ 371 seminit(); 372 #endif 373 374 #ifdef SYSVMSG 375 /* Initialize System V style message queues. */ 376 msginit(); 377 #endif 378 379 /* Attach pseudo-devices. */ 380 randomattach(); 381 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 382 if (pdev->pdev_count > 0) 383 (*pdev->pdev_attach)(pdev->pdev_count); 384 385 #ifdef CRYPTO 386 swcr_init(); 387 #endif /* CRYPTO */ 388 389 /* 390 * Initialize protocols. Block reception of incoming packets 391 * until everything is ready. 392 */ 393 s = splnet(); 394 ifinit(); 395 domaininit(); 396 if_attachdomain(); 397 splx(s); 398 399 #ifdef GPROF 400 /* Initialize kernel profiling. */ 401 kmstartup(); 402 #endif 403 404 #if !defined(NO_PROPOLICE) 405 { 406 volatile long newguard[8]; 407 408 arc4random_buf((long *)newguard, sizeof(newguard)); 409 410 for (i = nitems(__guard) - 1; i; i--) 411 __guard[i] = newguard[i]; 412 } 413 #endif 414 415 /* init exec and emul */ 416 init_exec(); 417 418 /* Start the scheduler */ 419 scheduler_start(); 420 421 /* 422 * Create process 1 (init(8)). We do this now, as Unix has 423 * historically had init be process 1, and changing this would 424 * probably upset a lot of people. 425 * 426 * Note that process 1 won't immediately exec init(8), but will 427 * wait for us to inform it that the root file system has been 428 * mounted. 429 */ 430 if (fork1(p, SIGCHLD, FORK_FORK, NULL, 0, start_init, NULL, NULL, 431 &initproc)) 432 panic("fork init"); 433 434 /* 435 * Create any kernel threads whose creation was deferred because 436 * initproc had not yet been created. 437 */ 438 kthread_run_deferred_queue(); 439 440 /* 441 * Now that device driver threads have been created, wait for 442 * them to finish any deferred autoconfiguration. Note we don't 443 * need to lock this semaphore, since we haven't booted any 444 * secondary processors, yet. 445 */ 446 while (config_pending) 447 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 448 449 dostartuphooks(); 450 451 #if NMPATH > 0 452 config_rootfound("mpath", NULL); 453 #endif 454 #if NVSCSI > 0 455 config_rootfound("vscsi", NULL); 456 #endif 457 #if NSOFTRAID > 0 458 config_rootfound("softraid", NULL); 459 #endif 460 461 /* Configure root/swap devices */ 462 diskconf(); 463 464 if (mountroot == NULL || ((*mountroot)() != 0)) 465 panic("cannot mount root"); 466 467 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 468 469 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 470 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 471 panic("cannot find root vnode"); 472 p->p_fd->fd_cdir = rootvnode; 473 vref(p->p_fd->fd_cdir); 474 VOP_UNLOCK(rootvnode, 0, p); 475 p->p_fd->fd_rdir = NULL; 476 477 /* 478 * Now that root is mounted, we can fixup initproc's CWD 479 * info. All other processes are kthreads, which merely 480 * share proc0's CWD info. 481 */ 482 initproc->p_fd->fd_cdir = rootvnode; 483 vref(initproc->p_fd->fd_cdir); 484 initproc->p_fd->fd_rdir = NULL; 485 486 /* 487 * Now can look at time, having had a chance to verify the time 488 * from the file system. Reset p->p_rtime as it may have been 489 * munched in mi_switch() after the time got set. 490 */ 491 #ifdef __HAVE_TIMECOUNTER 492 microtime(&boottime); 493 #else 494 boottime = mono_time = time; 495 #endif 496 LIST_FOREACH(p, &allproc, p_list) { 497 p->p_stats->p_start = boottime; 498 microuptime(&p->p_cpu->ci_schedstate.spc_runtime); 499 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 500 } 501 502 uvm_swap_init(); 503 504 /* Create the pageout daemon kernel thread. */ 505 if (kthread_create(uvm_pageout, NULL, NULL, "pagedaemon")) 506 panic("fork pagedaemon"); 507 508 /* Create the reaper daemon kernel thread. */ 509 if (kthread_create(start_reaper, NULL, NULL, "reaper")) 510 panic("fork reaper"); 511 512 /* Create the cleaner daemon kernel thread. */ 513 if (kthread_create(start_cleaner, NULL, NULL, "cleaner")) 514 panic("fork cleaner"); 515 516 /* Create the update daemon kernel thread. */ 517 if (kthread_create(start_update, NULL, NULL, "update")) 518 panic("fork update"); 519 520 /* Create the aiodone daemon kernel thread. */ 521 if (kthread_create(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 522 panic("fork aiodoned"); 523 524 #ifdef CRYPTO 525 /* Create the crypto kernel thread. */ 526 init_crypto(); 527 #endif /* CRYPTO */ 528 529 microtime(&rtv); 530 srandom((u_int32_t)(rtv.tv_sec ^ rtv.tv_usec) ^ arc4random()); 531 532 randompid = 1; 533 534 #if defined(MULTIPROCESSOR) 535 /* Boot the secondary processors. */ 536 cpu_boot_secondary_processors(); 537 #endif 538 539 domountroothooks(); 540 541 /* 542 * Okay, now we can let init(8) exec! It's off to userland! 543 */ 544 start_init_exec = 1; 545 wakeup((void *)&start_init_exec); 546 547 /* 548 * proc0: nothing to do, back to sleep 549 */ 550 while (1) 551 tsleep(&proc0, PVM, "scheduler", 0); 552 /* NOTREACHED */ 553 } 554 555 /* 556 * List of paths to try when searching for "init". 557 */ 558 static char *initpaths[] = { 559 "/sbin/init", 560 "/sbin/oinit", 561 "/sbin/init.bak", 562 NULL, 563 }; 564 565 void 566 check_console(struct proc *p) 567 { 568 struct nameidata nd; 569 int error; 570 571 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 572 error = namei(&nd); 573 if (error) { 574 if (error == ENOENT) 575 printf("warning: /dev/console does not exist\n"); 576 else 577 printf("warning: /dev/console error %d\n", error); 578 } else 579 vrele(nd.ni_vp); 580 } 581 582 /* 583 * Start the initial user process; try exec'ing each pathname in "initpaths". 584 * The program is invoked with one argument containing the boot flags. 585 */ 586 void 587 start_init(void *arg) 588 { 589 struct proc *p = arg; 590 vaddr_t addr; 591 struct sys_execve_args /* { 592 syscallarg(const char *) path; 593 syscallarg(char *const *) argp; 594 syscallarg(char *const *) envp; 595 } */ args; 596 int options, error; 597 long i; 598 register_t retval[2]; 599 char flags[4], *flagsp; 600 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 601 602 /* 603 * Now in process 1. 604 */ 605 606 /* 607 * Wait for main() to tell us that it's safe to exec. 608 */ 609 while (start_init_exec == 0) 610 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 611 612 check_console(p); 613 614 /* 615 * Need just enough stack to hold the faked-up "execve()" arguments. 616 */ 617 #ifdef MACHINE_STACK_GROWS_UP 618 addr = USRSTACK; 619 #else 620 addr = USRSTACK - PAGE_SIZE; 621 #endif 622 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 623 NULL, UVM_UNKNOWN_OFFSET, 0, 624 UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_ALL, UVM_INH_COPY, 625 UVM_ADV_NORMAL, UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW))) 626 panic("init: couldn't allocate argument space"); 627 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 628 629 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 630 #ifdef MACHINE_STACK_GROWS_UP 631 ucp = (char *)addr; 632 #else 633 ucp = (char *)(addr + PAGE_SIZE); 634 #endif 635 /* 636 * Construct the boot flag argument. 637 */ 638 flagsp = flags; 639 *flagsp++ = '-'; 640 options = 0; 641 642 if (boothowto & RB_SINGLE) { 643 *flagsp++ = 's'; 644 options = 1; 645 } 646 #ifdef notyet 647 if (boothowto & RB_FASTBOOT) { 648 *flagsp++ = 'f'; 649 options = 1; 650 } 651 #endif 652 653 /* 654 * Move out the flags (arg 1), if necessary. 655 */ 656 if (options != 0) { 657 *flagsp++ = '\0'; 658 i = flagsp - flags; 659 #ifdef DEBUG 660 printf("init: copying out flags `%s' %d\n", flags, i); 661 #endif 662 #ifdef MACHINE_STACK_GROWS_UP 663 arg1 = ucp; 664 (void)copyout((caddr_t)flags, (caddr_t)ucp, i); 665 ucp += i; 666 #else 667 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 668 arg1 = ucp; 669 #endif 670 } 671 672 /* 673 * Move out the file name (also arg 0). 674 */ 675 i = strlen(path) + 1; 676 #ifdef DEBUG 677 printf("init: copying out path `%s' %d\n", path, i); 678 #endif 679 #ifdef MACHINE_STACK_GROWS_UP 680 arg0 = ucp; 681 (void)copyout((caddr_t)path, (caddr_t)ucp, i); 682 ucp += i; 683 ucp = (caddr_t)ALIGN((u_long)ucp); 684 uap = (char **)ucp + 3; 685 #else 686 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 687 arg0 = ucp; 688 uap = (char **)((u_long)ucp & ~ALIGNBYTES); 689 #endif 690 691 /* 692 * Move out the arg pointers. 693 */ 694 i = 0; 695 copyout(&i, (caddr_t)--uap, sizeof(register_t)); /* terminator */ 696 if (options != 0) 697 copyout(&arg1, (caddr_t)--uap, sizeof(register_t)); 698 copyout(&arg0, (caddr_t)--uap, sizeof(register_t)); 699 700 /* 701 * Point at the arguments. 702 */ 703 SCARG(&args, path) = arg0; 704 SCARG(&args, argp) = uap; 705 SCARG(&args, envp) = NULL; 706 707 /* 708 * Now try to exec the program. If can't for any reason 709 * other than it doesn't exist, complain. 710 */ 711 if ((error = sys_execve(p, &args, retval)) == 0) { 712 KERNEL_PROC_UNLOCK(p); 713 return; 714 } 715 if (error != ENOENT) 716 printf("exec %s: error %d\n", path, error); 717 } 718 printf("init: not found\n"); 719 panic("no init"); 720 } 721 722 void 723 start_update(void *arg) 724 { 725 sched_sync(curproc); 726 /* NOTREACHED */ 727 } 728 729 void 730 start_cleaner(void *arg) 731 { 732 buf_daemon(curproc); 733 /* NOTREACHED */ 734 } 735 736 void 737 start_reaper(void *arg) 738 { 739 reaper(); 740 /* NOTREACHED */ 741 } 742