init_main.c revision 1.271
1 /* $NetBSD: init_main.c,v 1.271 2006/07/14 18:41:40 elad Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 37 */ 38 39 /* 40 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 71 */ 72 73 #include <sys/cdefs.h> 74 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.271 2006/07/14 18:41:40 elad Exp $"); 75 76 #include "opt_ipsec.h" 77 #include "opt_kcont.h" 78 #include "opt_multiprocessor.h" 79 #include "opt_ntp.h" 80 #include "opt_pipe.h" 81 #include "opt_posix.h" 82 #include "opt_syscall_debug.h" 83 #include "opt_sysv.h" 84 #include "opt_verified_exec.h" 85 #include "opt_fileassoc.h" 86 87 #include "rnd.h" 88 89 #include <sys/param.h> 90 #include <sys/acct.h> 91 #include <sys/filedesc.h> 92 #include <sys/file.h> 93 #include <sys/errno.h> 94 #include <sys/callout.h> 95 #include <sys/kernel.h> 96 #include <sys/kcont.h> 97 #include <sys/kmem.h> 98 #include <sys/mount.h> 99 #include <sys/proc.h> 100 #include <sys/kthread.h> 101 #include <sys/resourcevar.h> 102 #include <sys/signalvar.h> 103 #include <sys/systm.h> 104 #include <sys/vnode.h> 105 #include <sys/tty.h> 106 #include <sys/conf.h> 107 #include <sys/disklabel.h> 108 #include <sys/buf.h> 109 #include <sys/device.h> 110 #include <sys/exec.h> 111 #include <sys/socketvar.h> 112 #include <sys/protosw.h> 113 #include <sys/reboot.h> 114 #include <sys/user.h> 115 #include <sys/sysctl.h> 116 #include <sys/event.h> 117 #include <sys/mbuf.h> 118 #ifdef FAST_IPSEC 119 #include <netipsec/ipsec.h> 120 #endif 121 #ifdef SYSVSHM 122 #include <sys/shm.h> 123 #endif 124 #ifdef SYSVSEM 125 #include <sys/sem.h> 126 #endif 127 #ifdef SYSVMSG 128 #include <sys/msg.h> 129 #endif 130 #ifdef P1003_1B_SEMAPHORE 131 #include <sys/ksem.h> 132 #endif 133 #include <sys/domain.h> 134 #include <sys/namei.h> 135 #if NRND > 0 136 #include <sys/rnd.h> 137 #endif 138 #ifndef PIPE_SOCKETPAIR 139 #include <sys/pipe.h> 140 #endif 141 #ifdef LKM 142 #include <sys/lkm.h> 143 #endif 144 #ifdef VERIFIED_EXEC 145 #include <sys/verified_exec.h> 146 #endif 147 #include <sys/kauth.h> 148 #include <net80211/ieee80211_netbsd.h> 149 150 #include <sys/syscall.h> 151 #include <sys/sa.h> 152 #include <sys/syscallargs.h> 153 154 #ifdef FILEASSOC 155 #include <sys/fileassoc.h> 156 #endif /* FILEASSOC */ 157 158 #include <ufs/ufs/quota.h> 159 160 #include <miscfs/genfs/genfs.h> 161 #include <miscfs/syncfs/syncfs.h> 162 163 #include <machine/cpu.h> 164 165 #include <uvm/uvm.h> 166 167 #include <dev/cons.h> 168 169 #include <net/if.h> 170 #include <net/raw_cb.h> 171 172 extern struct proc proc0; 173 extern struct lwp lwp0; 174 extern struct cwdinfo cwdi0; 175 176 #ifndef curlwp 177 struct lwp *curlwp = &lwp0; 178 #endif 179 struct proc *initproc; 180 181 struct vnode *rootvp, *swapdev_vp; 182 int boothowto; 183 int cold = 1; /* still working on startup */ 184 #ifndef __HAVE_TIMECOUNTER 185 struct timeval boottime; 186 #endif 187 time_t rootfstime; /* recorded root fs time, if known */ 188 189 volatile int start_init_exec; /* semaphore for start_init() */ 190 191 static void check_console(struct lwp *l); 192 static void start_init(void *); 193 void main(void); 194 195 /* 196 * System startup; initialize the world, create process 0, mount root 197 * filesystem, and fork to create init and pagedaemon. Most of the 198 * hard work is done in the lower-level initialization routines including 199 * startup(), which does memory initialization and autoconfiguration. 200 */ 201 void 202 main(void) 203 { 204 #ifdef __HAVE_TIMECOUNTER 205 struct timeval time; 206 #endif 207 struct lwp *l; 208 struct proc *p; 209 struct pdevinit *pdev; 210 int s, error; 211 extern struct pdevinit pdevinit[]; 212 extern void schedcpu(void *); 213 #ifdef NVNODE_IMPLICIT 214 int usevnodes; 215 #endif 216 217 /* 218 * Initialize the current LWP pointer (curlwp) before 219 * any possible traps/probes to simplify trap processing. 220 */ 221 l = &lwp0; 222 curlwp = l; 223 l->l_cpu = curcpu(); 224 l->l_proc = &proc0; 225 l->l_lid = 1; 226 227 /* 228 * Attempt to find console and initialize 229 * in case of early panic or other messages. 230 */ 231 consinit(); 232 233 KERNEL_LOCK_INIT(); 234 235 uvm_init(); 236 237 kmem_init(); 238 239 /* Do machine-dependent initialization. */ 240 cpu_startup(); 241 242 /* Initialize callouts. */ 243 callout_startup(); 244 245 /* Initialize the buffer cache */ 246 bufinit(); 247 248 /* 249 * Initialize mbuf's. Do this now because we might attempt to 250 * allocate mbufs or mbuf clusters during autoconfiguration. 251 */ 252 mbinit(); 253 254 /* Initialize sockets. */ 255 soinit(); 256 257 #ifdef KCONT 258 /* Initialize kcont. */ 259 kcont_init(); 260 #endif 261 262 /* 263 * The following things must be done before autoconfiguration. 264 */ 265 evcnt_init(); /* initialize event counters */ 266 #if NRND > 0 267 rnd_init(); /* initialize RNG */ 268 #endif 269 /* Initialize the sysctl subsystem. */ 270 sysctl_init(); 271 272 /* Initialize process and pgrp structures. */ 273 procinit(); 274 275 /* Initialize signal-related data structures. */ 276 signal_init(); 277 278 /* Create process 0 (the swapper). */ 279 proc0_init(); 280 281 /* 282 * Charge root for one process. 283 */ 284 (void)chgproccnt(0, 1); 285 286 rqinit(); 287 288 /* Initialize the file systems. */ 289 #ifdef NVNODE_IMPLICIT 290 /* 291 * If maximum number of vnodes in namei vnode cache is not explicitly 292 * defined in kernel config, adjust the number such as we use roughly 293 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 294 */ 295 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 296 if (usevnodes > desiredvnodes) 297 desiredvnodes = usevnodes; 298 #endif 299 vfsinit(); 300 301 302 #ifdef __HAVE_TIMECOUNTER 303 inittimecounter(); 304 ntp_init(); 305 #endif /* __HAVE_TIMECOUNTER */ 306 307 /* Configure the system hardware. This will enable interrupts. */ 308 configure(); 309 310 ubc_init(); /* must be after autoconfig */ 311 312 /* Lock the kernel on behalf of proc0. */ 313 KERNEL_PROC_LOCK(l); 314 315 #ifdef SYSVSHM 316 /* Initialize System V style shared memory. */ 317 shminit(); 318 #endif 319 320 #ifdef SYSVSEM 321 /* Initialize System V style semaphores. */ 322 seminit(); 323 #endif 324 325 #ifdef SYSVMSG 326 /* Initialize System V style message queues. */ 327 msginit(); 328 #endif 329 330 #ifdef P1003_1B_SEMAPHORE 331 /* Initialize posix semaphores */ 332 ksem_init(); 333 #endif 334 335 /* Initialize kauth. */ 336 kauth_init(); 337 338 #ifdef FILEASSOC 339 fileassoc_init(); 340 #endif /* FILEASSOC */ 341 342 #ifdef VERIFIED_EXEC 343 /* 344 * Initialise the fingerprint operations vectors before 345 * fingerprints can be loaded. 346 */ 347 veriexec_init_fp_ops(); 348 #endif 349 350 /* Attach pseudo-devices. */ 351 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 352 (*pdev->pdev_attach)(pdev->pdev_count); 353 354 #ifdef FAST_IPSEC 355 /* Attach network crypto subsystem */ 356 ipsec_attach(); 357 #endif 358 359 /* 360 * Initialize protocols. Block reception of incoming packets 361 * until everything is ready. 362 */ 363 s = splnet(); 364 ifinit(); 365 domaininit(); 366 if_attachdomain(); 367 splx(s); 368 369 #ifdef GPROF 370 /* Initialize kernel profiling. */ 371 kmstartup(); 372 #endif 373 374 /* Initialize system accouting. */ 375 acct_init(); 376 377 /* Kick off timeout driven events by calling first time. */ 378 schedcpu(NULL); 379 380 /* 381 * Create process 1 (init(8)). We do this now, as Unix has 382 * historically had init be process 1, and changing this would 383 * probably upset a lot of people. 384 * 385 * Note that process 1 won't immediately exec init(8), but will 386 * wait for us to inform it that the root file system has been 387 * mounted. 388 */ 389 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 390 panic("fork init"); 391 392 /* 393 * Create any kernel threads who's creation was deferred because 394 * initproc had not yet been created. 395 */ 396 kthread_run_deferred_queue(); 397 398 /* 399 * Now that device driver threads have been created, wait for 400 * them to finish any deferred autoconfiguration. Note we don't 401 * need to lock this semaphore, since we haven't booted any 402 * secondary processors, yet. 403 */ 404 while (config_pending) 405 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 406 407 /* 408 * Finalize configuration now that all real devices have been 409 * found. This needs to be done before the root device is 410 * selected, since finalization may create the root device. 411 */ 412 config_finalize(); 413 414 /* 415 * Now that autoconfiguration has completed, we can determine 416 * the root and dump devices. 417 */ 418 cpu_rootconf(); 419 cpu_dumpconf(); 420 421 /* Mount the root file system. */ 422 do { 423 domountroothook(); 424 if ((error = vfs_mountroot())) { 425 printf("cannot mount root, error = %d\n", error); 426 boothowto |= RB_ASKNAME; 427 setroot(root_device, 428 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 429 } 430 } while (error != 0); 431 mountroothook_destroy(); 432 433 /* 434 * Initialise the time-of-day clock, passing the time recorded 435 * in the root filesystem (if any) for use by systems that 436 * don't have a non-volatile time-of-day device. 437 */ 438 inittodr(rootfstime); 439 440 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 441 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 442 443 /* 444 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 445 * reference it. 446 */ 447 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 448 if (error) 449 panic("cannot find root vnode, error=%d", error); 450 cwdi0.cwdi_cdir = rootvnode; 451 VREF(cwdi0.cwdi_cdir); 452 VOP_UNLOCK(rootvnode, 0); 453 cwdi0.cwdi_rdir = NULL; 454 455 /* 456 * Now that root is mounted, we can fixup initproc's CWD 457 * info. All other processes are kthreads, which merely 458 * share proc0's CWD info. 459 */ 460 initproc->p_cwdi->cwdi_cdir = rootvnode; 461 VREF(initproc->p_cwdi->cwdi_cdir); 462 initproc->p_cwdi->cwdi_rdir = NULL; 463 464 /* 465 * Now can look at time, having had a chance to verify the time 466 * from the file system. Reset p->p_rtime as it may have been 467 * munched in mi_switch() after the time got set. 468 */ 469 proclist_lock_read(); 470 s = splsched(); 471 #ifdef __HAVE_TIMECOUNTER 472 getmicrotime(&time); 473 #else 474 mono_time = time; 475 #endif 476 boottime = time; 477 LIST_FOREACH(p, &allproc, p_list) { 478 KASSERT((p->p_flag & P_MARKER) == 0); 479 p->p_stats->p_start = time; 480 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 481 if (l->l_cpu != NULL) 482 l->l_cpu->ci_schedstate.spc_runtime = time; 483 } 484 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 485 } 486 splx(s); 487 proclist_unlock_read(); 488 489 /* Create the pageout daemon kernel thread. */ 490 uvm_swap_init(); 491 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 492 panic("fork pagedaemon"); 493 494 /* Create the filesystem syncer kernel thread. */ 495 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 496 panic("fork syncer"); 497 498 /* Create the aiodone daemon kernel thread. */ 499 if (kthread_create1(uvm_aiodone_daemon, NULL, &uvm.aiodoned_proc, 500 "aiodoned")) 501 panic("fork aiodoned"); 502 503 #if defined(MULTIPROCESSOR) 504 /* Boot the secondary processors. */ 505 cpu_boot_secondary_processors(); 506 #endif 507 508 /* Initialize exec structures */ 509 exec_init(1); 510 511 /* 512 * Okay, now we can let init(8) exec! It's off to userland! 513 */ 514 start_init_exec = 1; 515 wakeup(&start_init_exec); 516 517 /* The scheduler is an infinite loop. */ 518 uvm_scheduler(); 519 /* NOTREACHED */ 520 } 521 522 void 523 setrootfstime(time_t t) 524 { 525 rootfstime = t; 526 } 527 528 static void 529 check_console(struct lwp *l) 530 { 531 struct nameidata nd; 532 int error; 533 534 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 535 error = namei(&nd); 536 if (error == 0) 537 vrele(nd.ni_vp); 538 else if (error == ENOENT) 539 printf("warning: no /dev/console\n"); 540 else 541 printf("warning: lookup /dev/console: error %d\n", error); 542 } 543 544 /* 545 * List of paths to try when searching for "init". 546 */ 547 static const char *initpaths[] = { 548 "/sbin/init", 549 "/sbin/oinit", 550 "/sbin/init.bak", 551 NULL, 552 }; 553 554 /* 555 * Start the initial user process; try exec'ing each pathname in "initpaths". 556 * The program is invoked with one argument containing the boot flags. 557 */ 558 static void 559 start_init(void *arg) 560 { 561 struct lwp *l = arg; 562 struct proc *p = l->l_proc; 563 vaddr_t addr; 564 struct sys_execve_args /* { 565 syscallarg(const char *) path; 566 syscallarg(char * const *) argp; 567 syscallarg(char * const *) envp; 568 } */ args; 569 int options, i, error; 570 register_t retval[2]; 571 char flags[4], *flagsp; 572 const char *path, *slash; 573 char *ucp, **uap, *arg0, *arg1 = NULL; 574 char ipath[129]; 575 int ipx, len; 576 577 /* 578 * Now in process 1. 579 */ 580 strncpy(p->p_comm, "init", MAXCOMLEN); 581 582 /* 583 * Wait for main() to tell us that it's safe to exec. 584 */ 585 while (start_init_exec == 0) 586 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 587 588 /* 589 * This is not the right way to do this. We really should 590 * hand-craft a descriptor onto /dev/console to hand to init, 591 * but that's a _lot_ more work, and the benefit from this easy 592 * hack makes up for the "good is the enemy of the best" effect. 593 */ 594 check_console(l); 595 596 /* 597 * Need just enough stack to hold the faked-up "execve()" arguments. 598 */ 599 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 600 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 601 NULL, UVM_UNKNOWN_OFFSET, 0, 602 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 603 UVM_ADV_NORMAL, 604 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 605 panic("init: couldn't allocate argument space"); 606 p->p_vmspace->vm_maxsaddr = (caddr_t)STACK_MAX(addr, PAGE_SIZE); 607 608 ipx = 0; 609 while (1) { 610 if (boothowto & RB_ASKNAME) { 611 printf("init path"); 612 if (initpaths[ipx]) 613 printf(" (default %s)", initpaths[ipx]); 614 printf(": "); 615 len = cngetsn(ipath, sizeof(ipath)-1); 616 if (len == 0) { 617 if (initpaths[ipx]) 618 path = initpaths[ipx++]; 619 else 620 continue; 621 } else { 622 ipath[len] = '\0'; 623 path = ipath; 624 } 625 } else { 626 if ((path = initpaths[ipx++]) == NULL) 627 break; 628 } 629 630 ucp = (char *)USRSTACK; 631 632 /* 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 arg1 = STACK_ALLOC(ucp, i); 660 ucp = STACK_MAX(arg1, i); 661 (void)copyout((caddr_t)flags, arg1, i); 662 } 663 664 /* 665 * Move out the file name (also arg 0). 666 */ 667 i = strlen(path) + 1; 668 #ifdef DEBUG 669 printf("init: copying out path `%s' %d\n", path, i); 670 #else 671 if (boothowto & RB_ASKNAME || path != initpaths[0]) 672 printf("init: trying %s\n", path); 673 #endif 674 arg0 = STACK_ALLOC(ucp, i); 675 ucp = STACK_MAX(arg0, i); 676 (void)copyout(path, arg0, i); 677 678 /* 679 * Move out the arg pointers. 680 */ 681 ucp = (caddr_t)STACK_ALIGN(ucp, ALIGNBYTES); 682 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 683 SCARG(&args, path) = arg0; 684 SCARG(&args, argp) = uap; 685 SCARG(&args, envp) = NULL; 686 slash = strrchr(path, '/'); 687 if (slash) 688 (void)suword((caddr_t)uap++, 689 (long)arg0 + (slash + 1 - path)); 690 else 691 (void)suword((caddr_t)uap++, (long)arg0); 692 if (options != 0) 693 (void)suword((caddr_t)uap++, (long)arg1); 694 (void)suword((caddr_t)uap++, 0); /* terminator */ 695 696 /* 697 * Now try to exec the program. If can't for any reason 698 * other than it doesn't exist, complain. 699 */ 700 error = sys_execve(l, &args, retval); 701 if (error == 0 || error == EJUSTRETURN) { 702 KERNEL_PROC_UNLOCK(l); 703 return; 704 } 705 printf("exec %s: error %d\n", path, error); 706 } 707 printf("init: not found\n"); 708 panic("no init"); 709 } 710
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