1 /* $OpenBSD: init_main.c,v 1.313 2021/12/09 00:26:10 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/filedesc.h> 43 #include <sys/file.h> 44 #include <sys/errno.h> 45 #include <sys/exec.h> 46 #include <sys/kernel.h> 47 #include <sys/kthread.h> 48 #include <sys/mount.h> 49 #include <sys/proc.h> 50 #include <sys/resourcevar.h> 51 #include <sys/signalvar.h> 52 #include <sys/systm.h> 53 #include <sys/namei.h> 54 #include <sys/vnode.h> 55 #include <sys/tty.h> 56 #include <sys/conf.h> 57 #include <sys/buf.h> 58 #include <sys/device.h> 59 #include <sys/socketvar.h> 60 #include <sys/lockf.h> 61 #include <sys/protosw.h> 62 #include <sys/reboot.h> 63 #include <sys/user.h> 64 #ifdef SYSVSHM 65 #include <sys/shm.h> 66 #endif 67 #ifdef SYSVSEM 68 #include <sys/sem.h> 69 #endif 70 #ifdef SYSVMSG 71 #include <sys/msg.h> 72 #endif 73 #include <sys/domain.h> 74 #include <sys/event.h> 75 #include <sys/msgbuf.h> 76 #include <sys/mbuf.h> 77 #include <sys/pipe.h> 78 #include <sys/task.h> 79 #include <sys/witness.h> 80 #include <sys/smr.h> 81 82 #include <sys/syscall.h> 83 #include <sys/syscallargs.h> 84 85 #include <uvm/uvm_extern.h> 86 87 #include <ufs/ufs/quota.h> 88 89 #include <net/if.h> 90 #include <net/rtable.h> 91 #include <net/netisr.h> 92 93 #if defined(CRYPTO) 94 #include <crypto/cryptodev.h> 95 #include <crypto/cryptosoft.h> 96 #endif 97 98 #if defined(KUBSAN) 99 extern void kubsan_init(void); 100 #endif 101 102 #if defined(NFSSERVER) || defined(NFSCLIENT) 103 extern void nfs_init(void); 104 #endif 105 106 #include "stoeplitz.h" 107 #if NSTOEPLITZ > 0 108 extern void stoeplitz_init(void); 109 #endif 110 111 #include "mpath.h" 112 #include "vscsi.h" 113 #include "softraid.h" 114 115 const char copyright[] = 116 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 117 "\tThe Regents of the University of California. All rights reserved.\n" 118 "Copyright (c) 1995-2021 OpenBSD. All rights reserved. https://www.OpenBSD.org\n"; 119 120 /* Components of the first process -- never freed. */ 121 struct session session0; 122 struct pgrp pgrp0; 123 struct proc proc0; 124 struct process process0; 125 struct plimit limit0; 126 struct vmspace vmspace0; 127 struct sigacts sigacts0; 128 struct process *initprocess; 129 struct proc *reaperproc; 130 131 extern struct user *proc0paddr; 132 133 struct vnode *rootvp, *swapdev_vp; 134 int boothowto; 135 int db_active = 0; 136 int ncpus = 1; 137 int ncpusfound = 1; /* number of cpus we find */ 138 volatile int start_init_exec; /* semaphore for start_init() */ 139 140 #if !defined(NO_PROPOLICE) 141 long __guard_local __attribute__((section(".openbsd.randomdata"))); 142 #endif 143 144 /* XXX return int so gcc -Werror won't complain */ 145 int main(void *); 146 void check_console(struct proc *); 147 void start_init(void *); 148 void db_ctf_init(void); 149 void prof_init(void); 150 void init_exec(void); 151 void futex_init(void); 152 void taskq_init(void); 153 void timeout_proc_init(void); 154 void pool_gc_pages(void *); 155 void percpu_init(void); 156 157 #ifdef DIAGNOSTIC 158 int pdevinit_done = 0; 159 #endif 160 161 /* 162 * System startup; initialize the world, create process 0, mount root 163 * filesystem, and fork to create init and pagedaemon. Most of the 164 * hard work is done in the lower-level initialization routines including 165 * startup(), which does memory initialization and autoconfiguration. 166 */ 167 /* XXX return int, so gcc -Werror won't complain */ 168 int 169 main(void *framep) 170 { 171 struct proc *p; 172 struct process *pr; 173 struct pdevinit *pdev; 174 extern struct pdevinit pdevinit[]; 175 extern void disk_init(void); 176 177 /* 178 * Initialize the current process pointer (curproc) before 179 * any possible traps/probes to simplify trap processing. 180 */ 181 curproc = p = &proc0; 182 p->p_cpu = curcpu(); 183 184 /* 185 * Initialize timeouts. 186 */ 187 timeout_startup(); 188 189 /* 190 * Attempt to find console and initialize 191 * in case of early panic or other messages. 192 */ 193 config_init(); /* init autoconfiguration data structures */ 194 consinit(); 195 196 printf("%s\n", copyright); 197 198 #ifdef KUBSAN 199 /* Initialize kubsan. */ 200 kubsan_init(); 201 #endif 202 203 WITNESS_INITIALIZE(); 204 205 KERNEL_LOCK_INIT(); 206 SCHED_LOCK_INIT(); 207 208 rw_obj_init(); 209 uvm_init(); 210 disk_init(); /* must come before autoconfiguration */ 211 tty_init(); /* initialise tty's */ 212 cpu_startup(); 213 214 random_start(boothowto & RB_GOODRANDOM); /* Start the flow */ 215 216 /* 217 * Initialize mbuf's. Do this now because we might attempt to 218 * allocate mbufs or mbuf clusters during autoconfiguration. 219 */ 220 mbinit(); 221 222 #if NSTOEPLITZ > 0 223 stoeplitz_init(); 224 #endif 225 226 /* Initialize sockets. */ 227 soinit(); 228 229 /* Initialize SRP subsystem. */ 230 srp_startup(); 231 232 /* Initialize SMR subsystem. */ 233 smr_startup(); 234 235 /* 236 * Initialize process and pgrp structures. 237 */ 238 procinit(); 239 240 /* Initialize file locking. */ 241 lf_init(); 242 243 /* 244 * Initialize filedescriptors. 245 */ 246 filedesc_init(); 247 248 /* 249 * Initialize pipes. 250 */ 251 pipe_init(); 252 253 /* 254 * Initialize kqueues. 255 */ 256 kqueue_init(); 257 258 /* 259 * Initialize futexes. 260 */ 261 futex_init(); 262 263 /* Create credentials. */ 264 p->p_ucred = crget(); 265 p->p_ucred->cr_ngroups = 1; /* group 0 */ 266 267 /* 268 * Create process 0 (the swapper). 269 */ 270 pr = &process0; 271 process_initialize(pr, p); 272 273 LIST_INSERT_HEAD(&allprocess, pr, ps_list); 274 LIST_INSERT_HEAD(PIDHASH(0), pr, ps_hash); 275 atomic_setbits_int(&pr->ps_flags, PS_SYSTEM); 276 277 /* Set the default routing table/domain. */ 278 process0.ps_rtableid = 0; 279 280 LIST_INSERT_HEAD(&allproc, p, p_list); 281 pr->ps_pgrp = &pgrp0; 282 LIST_INSERT_HEAD(TIDHASH(0), p, p_hash); 283 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 284 LIST_INIT(&pgrp0.pg_members); 285 LIST_INSERT_HEAD(&pgrp0.pg_members, pr, ps_pglist); 286 287 pgrp0.pg_session = &session0; 288 session0.s_count = 1; 289 session0.s_leader = pr; 290 291 atomic_setbits_int(&p->p_flag, P_SYSTEM); 292 p->p_stat = SONPROC; 293 pr->ps_nice = NZERO; 294 strlcpy(pr->ps_comm, "swapper", sizeof(pr->ps_comm)); 295 296 /* Init timeouts. */ 297 timeout_set(&p->p_sleep_to, endtsleep, p); 298 299 /* Initialize signal state for process 0. */ 300 signal_init(); 301 siginit(&sigacts0); 302 pr->ps_sigacts = &sigacts0; 303 304 /* Create the file descriptor table. */ 305 p->p_fd = pr->ps_fd = fdinit(); 306 307 /* Create the limits structures. */ 308 lim_startup(&limit0); 309 pr->ps_limit = &limit0; 310 311 /* Allocate a prototype map so we have something to fork. */ 312 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 313 trunc_page(VM_MAX_ADDRESS), TRUE, TRUE); 314 p->p_vmspace = pr->ps_vmspace = &vmspace0; 315 316 p->p_addr = proc0paddr; /* XXX */ 317 318 /* 319 * Charge root for one process. 320 */ 321 (void)chgproccnt(0, 1); 322 323 /* Initialize run queues */ 324 sched_init_runqueues(); 325 sleep_queue_init(); 326 sched_init_cpu(curcpu()); 327 p->p_cpu->ci_randseed = (arc4random() & 0x7fffffff) + 1; 328 329 /* Initialize timeouts in process context. */ 330 timeout_proc_init(); 331 332 /* Initialize task queues */ 333 taskq_init(); 334 335 /* Initialize the interface/address trees */ 336 ifinit(); 337 338 /* Lock the kernel on behalf of proc0. */ 339 KERNEL_LOCK(); 340 341 #if NMPATH > 0 342 /* Attach mpath before hardware */ 343 config_rootfound("mpath", NULL); 344 #endif 345 346 /* Configure the devices */ 347 cpu_configure(); 348 349 /* Configure virtual memory system, set vm rlimits. */ 350 uvm_init_limits(&limit0); 351 352 /* Per CPU memory allocation */ 353 percpu_init(); 354 355 /* Initialize the file systems. */ 356 #if defined(NFSSERVER) || defined(NFSCLIENT) 357 nfs_init(); /* initialize server/shared data */ 358 #endif 359 vfsinit(); 360 361 /* Start real time and statistics clocks. */ 362 initclocks(); 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 /* Create default routing table before attaching lo0. */ 380 rtable_init(); 381 382 /* Attach pseudo-devices. */ 383 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 384 if (pdev->pdev_count > 0) 385 (*pdev->pdev_attach)(pdev->pdev_count); 386 #ifdef DIAGNOSTIC 387 pdevinit_done = 1; 388 #endif 389 390 #ifdef CRYPTO 391 crypto_init(); 392 swcr_init(); 393 #endif /* CRYPTO */ 394 395 /* 396 * Initialize protocols. 397 */ 398 domaininit(); 399 400 initconsbuf(); 401 402 #if defined(GPROF) || defined(DDBPROF) 403 /* Initialize kernel profiling. */ 404 prof_init(); 405 #endif 406 407 /* Enable per-CPU data. */ 408 mbcpuinit(); 409 kqueue_init_percpu(); 410 uvm_init_percpu(); 411 412 /* init exec */ 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 { 428 struct proc *initproc; 429 430 if (fork1(p, FORK_FORK, start_init, NULL, NULL, &initproc)) 431 panic("fork init"); 432 initprocess = initproc->p_p; 433 } 434 435 randompid = 1; 436 437 /* 438 * Create any kernel threads whose creation was deferred because 439 * initprocess had not yet been created. 440 */ 441 kthread_run_deferred_queue(); 442 443 /* 444 * Now that device driver threads have been created, wait for 445 * them to finish any deferred autoconfiguration. Note we don't 446 * need to lock this semaphore, since we haven't booted any 447 * secondary processors, yet. 448 */ 449 while (config_pending) 450 tsleep_nsec(&config_pending, PWAIT, "cfpend", INFSLP); 451 452 dostartuphooks(); 453 454 #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 #ifdef DDB 465 /* Make debug symbols available in ddb. */ 466 db_ctf_init(); 467 #endif 468 469 if (mountroot == NULL || ((*mountroot)() != 0)) 470 panic("cannot mount root"); 471 472 TAILQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 473 474 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 475 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 476 panic("cannot find root vnode"); 477 p->p_fd->fd_cdir = rootvnode; 478 vref(p->p_fd->fd_cdir); 479 VOP_UNLOCK(rootvnode); 480 p->p_fd->fd_rdir = NULL; 481 482 /* 483 * Now that root is mounted, we can fixup initprocess's CWD 484 * info. All other processes are kthreads, which merely 485 * share proc0's CWD info. 486 */ 487 initprocess->ps_fd->fd_cdir = rootvnode; 488 vref(initprocess->ps_fd->fd_cdir); 489 initprocess->ps_fd->fd_rdir = NULL; 490 491 /* 492 * Now can look at time, having had a chance to verify the time 493 * from the file system. Reset p->p_rtime as it may have been 494 * munched in mi_switch() after the time got set. 495 */ 496 LIST_FOREACH(pr, &allprocess, ps_list) { 497 nanouptime(&pr->ps_start); 498 TAILQ_FOREACH(p, &pr->ps_threads, p_thr_link) { 499 nanouptime(&p->p_cpu->ci_schedstate.spc_runtime); 500 timespecclear(&p->p_rtime); 501 } 502 } 503 504 uvm_swap_init(); 505 506 /* Create the pageout daemon kernel thread. */ 507 if (kthread_create(uvm_pageout, NULL, NULL, "pagedaemon")) 508 panic("fork pagedaemon"); 509 510 /* Create the reaper daemon kernel thread. */ 511 if (kthread_create(reaper, NULL, &reaperproc, "reaper")) 512 panic("fork reaper"); 513 514 /* Create the cleaner daemon kernel thread. */ 515 if (kthread_create(buf_daemon, NULL, &cleanerproc, "cleaner")) 516 panic("fork cleaner"); 517 518 /* Create the update daemon kernel thread. */ 519 if (kthread_create(syncer_thread, NULL, &syncerproc, "update")) 520 panic("fork update"); 521 522 /* Create the aiodone daemon kernel thread. */ 523 if (kthread_create(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 524 panic("fork aiodoned"); 525 526 #if !defined(__hppa__) 527 /* Create the page zeroing kernel thread. */ 528 if (kthread_create(uvm_pagezero_thread, NULL, NULL, "zerothread")) 529 panic("fork zerothread"); 530 #endif 531 532 #if defined(MULTIPROCESSOR) 533 /* Boot the secondary processors. */ 534 cpu_boot_secondary_processors(); 535 #endif 536 537 /* Now that all CPUs partake in scheduling, start SMR thread. */ 538 smr_startup_thread(); 539 540 config_process_deferred_mountroot(); 541 542 /* 543 * Okay, now we can let init(8) exec! It's off to userland! 544 */ 545 start_init_exec = 1; 546 wakeup((void *)&start_init_exec); 547 548 /* 549 * Start the idle pool page garbage collector 550 */ 551 #if !(defined(__m88k__) && defined(MULTIPROCESSOR)) /* XXX */ 552 pool_gc_pages(NULL); 553 #endif 554 555 start_periodic_resettodr(); 556 557 /* 558 * proc0: nothing to do, back to sleep 559 */ 560 while (1) 561 tsleep_nsec(&proc0, PVM, "scheduler", INFSLP); 562 /* NOTREACHED */ 563 } 564 565 /* 566 * List of paths to try when searching for "init". 567 */ 568 static char *initpaths[] = { 569 "/sbin/init", 570 "/sbin/oinit", 571 "/sbin/init.bak", 572 NULL, 573 }; 574 575 void 576 check_console(struct proc *p) 577 { 578 struct nameidata nd; 579 int error; 580 581 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 582 error = namei(&nd); 583 if (error) { 584 if (error == ENOENT) 585 printf("warning: /dev/console does not exist\n"); 586 else 587 printf("warning: /dev/console error %d\n", error); 588 } else 589 vrele(nd.ni_vp); 590 } 591 592 /* 593 * Start the initial user process; try exec'ing each pathname in "initpaths". 594 * The program is invoked with one argument containing the boot flags. 595 */ 596 void 597 start_init(void *arg) 598 { 599 struct proc *p = arg; 600 vaddr_t addr; 601 struct sys_execve_args /* { 602 syscallarg(const char *) path; 603 syscallarg(char *const *) argp; 604 syscallarg(char *const *) envp; 605 } */ args; 606 int options, error; 607 long i; 608 register_t retval[2]; 609 char flags[4], *flagsp; 610 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 611 612 /* 613 * Now in process 1. 614 */ 615 616 /* 617 * Wait for main() to tell us that it's safe to exec. 618 */ 619 while (start_init_exec == 0) 620 tsleep_nsec(&start_init_exec, PWAIT, "initexec", INFSLP); 621 622 check_console(p); 623 624 /* process 0 ignores SIGCHLD, but we can't */ 625 p->p_p->ps_sigacts->ps_sigflags = 0; 626 627 /* 628 * Need just enough stack to hold the faked-up "execve()" arguments. 629 */ 630 #ifdef MACHINE_STACK_GROWS_UP 631 addr = USRSTACK; 632 #else 633 addr = USRSTACK - PAGE_SIZE; 634 #endif 635 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 636 p->p_vmspace->vm_minsaddr = (caddr_t)(addr + PAGE_SIZE); 637 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 638 NULL, UVM_UNKNOWN_OFFSET, 0, 639 UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_MASK, MAP_INHERIT_COPY, 640 MADV_NORMAL, 641 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW|UVM_FLAG_STACK|UVM_FLAG_SYSCALL))) 642 panic("init: couldn't allocate argument space"); 643 644 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 645 #ifdef MACHINE_STACK_GROWS_UP 646 ucp = (char *)addr; 647 #else 648 ucp = (char *)(addr + PAGE_SIZE); 649 #endif 650 /* 651 * Construct the boot flag argument. 652 */ 653 flagsp = flags; 654 *flagsp++ = '-'; 655 options = 0; 656 657 if (boothowto & RB_SINGLE) { 658 *flagsp++ = 's'; 659 options = 1; 660 } 661 #ifdef notyet 662 if (boothowto & RB_FASTBOOT) { 663 *flagsp++ = 'f'; 664 options = 1; 665 } 666 #endif 667 668 /* 669 * Move out the flags (arg 1), if necessary. 670 */ 671 if (options != 0) { 672 *flagsp++ = '\0'; 673 i = flagsp - flags; 674 #ifdef DEBUG 675 printf("init: copying out flags `%s' %ld\n", flags, i); 676 #endif 677 #ifdef MACHINE_STACK_GROWS_UP 678 arg1 = ucp; 679 (void)copyout((caddr_t)flags, (caddr_t)ucp, i); 680 ucp += i; 681 #else 682 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 683 arg1 = ucp; 684 #endif 685 } 686 687 /* 688 * Move out the file name (also arg 0). 689 */ 690 i = strlen(path) + 1; 691 #ifdef DEBUG 692 printf("init: copying out path `%s' %ld\n", path, i); 693 #endif 694 #ifdef MACHINE_STACK_GROWS_UP 695 arg0 = ucp; 696 (void)copyout((caddr_t)path, (caddr_t)ucp, i); 697 ucp += i; 698 ucp = (caddr_t)ALIGN((u_long)ucp); 699 uap = (char **)ucp + 3; 700 #else 701 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 702 arg0 = ucp; 703 uap = (char **)((u_long)ucp & ~ALIGNBYTES); 704 #endif 705 706 /* 707 * Move out the arg pointers. 708 */ 709 i = 0; 710 copyout(&i, (caddr_t)--uap, sizeof(register_t)); /* terminator */ 711 if (options != 0) 712 copyout(&arg1, (caddr_t)--uap, sizeof(register_t)); 713 copyout(&arg0, (caddr_t)--uap, sizeof(register_t)); 714 715 /* 716 * Point at the arguments. 717 */ 718 SCARG(&args, path) = arg0; 719 SCARG(&args, argp) = uap; 720 SCARG(&args, envp) = NULL; 721 722 /* 723 * Now try to exec the program. If can't for any reason 724 * other than it doesn't exist, complain. 725 */ 726 if ((error = sys_execve(p, &args, retval)) == 0) { 727 KERNEL_UNLOCK(); 728 return; 729 } 730 if (error != ENOENT) 731 printf("exec %s: error %d\n", path, error); 732 } 733 printf("init: not found\n"); 734 panic("no init"); 735 } 736