1 /* $OpenBSD: init_main.c,v 1.162 2009/08/11 18:43:33 blambert 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 /* Allocate a prototype map so we have something to fork. */ 318 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 319 trunc_page(VM_MAX_ADDRESS), TRUE, TRUE); 320 p->p_vmspace = &vmspace0; 321 322 p->p_addr = proc0paddr; /* XXX */ 323 324 /* 325 * We continue to place resource usage info in the 326 * user struct so they're pageable. 327 */ 328 p->p_stats = &p->p_addr->u_stats; 329 330 /* 331 * Charge root for one process. 332 */ 333 (void)chgproccnt(0, 1); 334 335 /* Initialize run queues */ 336 sched_init_runqueues(); 337 sleep_queue_init(); 338 sched_init_cpu(curcpu()); 339 340 /* Initialize work queues */ 341 workq_init(); 342 343 /* Configure the devices */ 344 cpu_configure(); 345 346 /* Configure virtual memory system, set vm rlimits. */ 347 uvm_init_limits(p); 348 349 /* Initialize the file systems. */ 350 #if defined(NFSSERVER) || defined(NFSCLIENT) 351 nfs_init(); /* initialize server/shared data */ 352 #endif 353 vfsinit(); 354 355 /* Start real time and statistics clocks. */ 356 initclocks(); 357 358 /* Lock the kernel on behalf of proc0. */ 359 KERNEL_PROC_LOCK(p); 360 361 #ifdef SYSVSHM 362 /* Initialize System V style shared memory. */ 363 shminit(); 364 #endif 365 366 #ifdef SYSVSEM 367 /* Initialize System V style semaphores. */ 368 seminit(); 369 #endif 370 371 #ifdef SYSVMSG 372 /* Initialize System V style message queues. */ 373 msginit(); 374 #endif 375 376 /* Attach pseudo-devices. */ 377 randomattach(); 378 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 379 if (pdev->pdev_count > 0) 380 (*pdev->pdev_attach)(pdev->pdev_count); 381 382 #ifdef CRYPTO 383 swcr_init(); 384 #endif /* CRYPTO */ 385 386 /* 387 * Initialize protocols. Block reception of incoming packets 388 * until everything is ready. 389 */ 390 s = splnet(); 391 ifinit(); 392 domaininit(); 393 if_attachdomain(); 394 splx(s); 395 396 #ifdef GPROF 397 /* Initialize kernel profiling. */ 398 kmstartup(); 399 #endif 400 401 #if !defined(NO_PROPOLICE) 402 { 403 volatile long newguard[8]; 404 405 arc4random_buf((long *)newguard, sizeof(newguard)); 406 407 for (i = nitems(__guard) - 1; i; i--) 408 __guard[i] = newguard[i]; 409 } 410 #endif 411 412 /* init exec and emul */ 413 init_exec(); 414 415 /* Start the scheduler */ 416 scheduler_start(); 417 418 /* 419 * Create process 1 (init(8)). We do this now, as Unix has 420 * historically had init be process 1, and changing this would 421 * probably upset a lot of people. 422 * 423 * Note that process 1 won't immediately exec init(8), but will 424 * wait for us to inform it that the root file system has been 425 * mounted. 426 */ 427 if (fork1(p, SIGCHLD, FORK_FORK, NULL, 0, start_init, NULL, NULL, 428 &initproc)) 429 panic("fork init"); 430 431 /* 432 * Create any kernel threads whose creation was deferred because 433 * initproc had not yet been created. 434 */ 435 kthread_run_deferred_queue(); 436 437 /* 438 * Now that device driver threads have been created, wait for 439 * them to finish any deferred autoconfiguration. Note we don't 440 * need to lock this semaphore, since we haven't booted any 441 * secondary processors, yet. 442 */ 443 while (config_pending) 444 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 445 446 dostartuphooks(); 447 448 #if NMPATH > 0 449 config_rootfound("mpath", NULL); 450 #endif 451 #if NVSCSI > 0 452 config_rootfound("vscsi", NULL); 453 #endif 454 #if NSOFTRAID > 0 455 config_rootfound("softraid", NULL); 456 #endif 457 458 /* Configure root/swap devices */ 459 diskconf(); 460 461 if (mountroot == NULL || ((*mountroot)() != 0)) 462 panic("cannot mount root"); 463 464 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 465 466 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 467 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 468 panic("cannot find root vnode"); 469 p->p_fd->fd_cdir = rootvnode; 470 vref(p->p_fd->fd_cdir); 471 VOP_UNLOCK(rootvnode, 0, p); 472 p->p_fd->fd_rdir = NULL; 473 474 /* 475 * Now that root is mounted, we can fixup initproc's CWD 476 * info. All other processes are kthreads, which merely 477 * share proc0's CWD info. 478 */ 479 initproc->p_fd->fd_cdir = rootvnode; 480 vref(initproc->p_fd->fd_cdir); 481 initproc->p_fd->fd_rdir = NULL; 482 483 /* 484 * Now can look at time, having had a chance to verify the time 485 * from the file system. Reset p->p_rtime as it may have been 486 * munched in mi_switch() after the time got set. 487 */ 488 #ifdef __HAVE_TIMECOUNTER 489 microtime(&boottime); 490 #else 491 boottime = mono_time = time; 492 #endif 493 LIST_FOREACH(p, &allproc, p_list) { 494 p->p_stats->p_start = boottime; 495 microuptime(&p->p_cpu->ci_schedstate.spc_runtime); 496 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 497 } 498 499 uvm_swap_init(); 500 501 /* Create the pageout daemon kernel thread. */ 502 if (kthread_create(uvm_pageout, NULL, NULL, "pagedaemon")) 503 panic("fork pagedaemon"); 504 505 /* Create the reaper daemon kernel thread. */ 506 if (kthread_create(start_reaper, NULL, NULL, "reaper")) 507 panic("fork reaper"); 508 509 /* Create the cleaner daemon kernel thread. */ 510 if (kthread_create(start_cleaner, NULL, NULL, "cleaner")) 511 panic("fork cleaner"); 512 513 /* Create the update daemon kernel thread. */ 514 if (kthread_create(start_update, NULL, NULL, "update")) 515 panic("fork update"); 516 517 /* Create the aiodone daemon kernel thread. */ 518 if (kthread_create(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 519 panic("fork aiodoned"); 520 521 #ifdef CRYPTO 522 /* Create the crypto kernel thread. */ 523 init_crypto(); 524 #endif /* CRYPTO */ 525 526 microtime(&rtv); 527 srandom((u_int32_t)(rtv.tv_sec ^ rtv.tv_usec) ^ arc4random()); 528 529 randompid = 1; 530 531 #if defined(MULTIPROCESSOR) 532 /* Boot the secondary processors. */ 533 cpu_boot_secondary_processors(); 534 #endif 535 536 domountroothooks(); 537 538 /* 539 * Okay, now we can let init(8) exec! It's off to userland! 540 */ 541 start_init_exec = 1; 542 wakeup((void *)&start_init_exec); 543 544 /* 545 * proc0: nothing to do, back to sleep 546 */ 547 while (1) 548 tsleep(&proc0, PVM, "scheduler", 0); 549 /* NOTREACHED */ 550 } 551 552 /* 553 * List of paths to try when searching for "init". 554 */ 555 static char *initpaths[] = { 556 "/sbin/init", 557 "/sbin/oinit", 558 "/sbin/init.bak", 559 NULL, 560 }; 561 562 void 563 check_console(struct proc *p) 564 { 565 struct nameidata nd; 566 int error; 567 568 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 569 error = namei(&nd); 570 if (error) { 571 if (error == ENOENT) 572 printf("warning: /dev/console does not exist\n"); 573 else 574 printf("warning: /dev/console error %d\n", error); 575 } else 576 vrele(nd.ni_vp); 577 } 578 579 /* 580 * Start the initial user process; try exec'ing each pathname in "initpaths". 581 * The program is invoked with one argument containing the boot flags. 582 */ 583 void 584 start_init(void *arg) 585 { 586 struct proc *p = arg; 587 vaddr_t addr; 588 struct sys_execve_args /* { 589 syscallarg(const char *) path; 590 syscallarg(char *const *) argp; 591 syscallarg(char *const *) envp; 592 } */ args; 593 int options, error; 594 long i; 595 register_t retval[2]; 596 char flags[4], *flagsp; 597 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 598 599 /* 600 * Now in process 1. 601 */ 602 603 /* 604 * Wait for main() to tell us that it's safe to exec. 605 */ 606 while (start_init_exec == 0) 607 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 608 609 check_console(p); 610 611 /* 612 * Need just enough stack to hold the faked-up "execve()" arguments. 613 */ 614 #ifdef MACHINE_STACK_GROWS_UP 615 addr = USRSTACK; 616 #else 617 addr = USRSTACK - PAGE_SIZE; 618 #endif 619 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 620 NULL, UVM_UNKNOWN_OFFSET, 0, 621 UVM_MAPFLAG(UVM_PROT_RW, UVM_PROT_ALL, UVM_INH_COPY, 622 UVM_ADV_NORMAL, UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW))) 623 panic("init: couldn't allocate argument space"); 624 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 625 626 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 627 #ifdef MACHINE_STACK_GROWS_UP 628 ucp = (char *)addr; 629 #else 630 ucp = (char *)(addr + PAGE_SIZE); 631 #endif 632 /* 633 * Construct the boot flag argument. 634 */ 635 flagsp = flags; 636 *flagsp++ = '-'; 637 options = 0; 638 639 if (boothowto & RB_SINGLE) { 640 *flagsp++ = 's'; 641 options = 1; 642 } 643 #ifdef notyet 644 if (boothowto & RB_FASTBOOT) { 645 *flagsp++ = 'f'; 646 options = 1; 647 } 648 #endif 649 650 /* 651 * Move out the flags (arg 1), if necessary. 652 */ 653 if (options != 0) { 654 *flagsp++ = '\0'; 655 i = flagsp - flags; 656 #ifdef DEBUG 657 printf("init: copying out flags `%s' %d\n", flags, i); 658 #endif 659 #ifdef MACHINE_STACK_GROWS_UP 660 arg1 = ucp; 661 (void)copyout((caddr_t)flags, (caddr_t)ucp, i); 662 ucp += i; 663 #else 664 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 665 arg1 = ucp; 666 #endif 667 } 668 669 /* 670 * Move out the file name (also arg 0). 671 */ 672 i = strlen(path) + 1; 673 #ifdef DEBUG 674 printf("init: copying out path `%s' %d\n", path, i); 675 #endif 676 #ifdef MACHINE_STACK_GROWS_UP 677 arg0 = ucp; 678 (void)copyout((caddr_t)path, (caddr_t)ucp, i); 679 ucp += i; 680 ucp = (caddr_t)ALIGN((u_long)ucp); 681 uap = (char **)ucp + 3; 682 #else 683 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 684 arg0 = ucp; 685 uap = (char **)((u_long)ucp & ~ALIGNBYTES); 686 #endif 687 688 /* 689 * Move out the arg pointers. 690 */ 691 i = 0; 692 copyout(&i, (caddr_t)--uap, sizeof(register_t)); /* terminator */ 693 if (options != 0) 694 copyout(&arg1, (caddr_t)--uap, sizeof(register_t)); 695 copyout(&arg0, (caddr_t)--uap, sizeof(register_t)); 696 697 /* 698 * Point at the arguments. 699 */ 700 SCARG(&args, path) = arg0; 701 SCARG(&args, argp) = uap; 702 SCARG(&args, envp) = NULL; 703 704 /* 705 * Now try to exec the program. If can't for any reason 706 * other than it doesn't exist, complain. 707 */ 708 if ((error = sys_execve(p, &args, retval)) == 0) { 709 KERNEL_PROC_UNLOCK(p); 710 return; 711 } 712 if (error != ENOENT) 713 printf("exec %s: error %d\n", path, error); 714 } 715 printf("init: not found\n"); 716 panic("no init"); 717 } 718 719 void 720 start_update(void *arg) 721 { 722 sched_sync(curproc); 723 /* NOTREACHED */ 724 } 725 726 void 727 start_cleaner(void *arg) 728 { 729 buf_daemon(curproc); 730 /* NOTREACHED */ 731 } 732 733 void 734 start_reaper(void *arg) 735 { 736 reaper(); 737 /* NOTREACHED */ 738 } 739