1 /* $OpenBSD: init_main.c,v 1.315 2022/02/22 01:15:01 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/reboot.h> 62 #include <sys/user.h> 63 #ifdef SYSVSHM 64 #include <sys/shm.h> 65 #endif 66 #ifdef SYSVSEM 67 #include <sys/sem.h> 68 #endif 69 #ifdef SYSVMSG 70 #include <sys/msg.h> 71 #endif 72 #include <sys/domain.h> 73 #include <sys/event.h> 74 #include <sys/msgbuf.h> 75 #include <sys/mbuf.h> 76 #include <sys/pipe.h> 77 #include <sys/task.h> 78 #include <sys/witness.h> 79 #include <sys/smr.h> 80 81 #include <sys/syscall.h> 82 #include <sys/syscallargs.h> 83 84 #include <uvm/uvm_extern.h> 85 86 #include <ufs/ufs/quota.h> 87 88 #include <net/if.h> 89 #include <net/rtable.h> 90 #include <net/netisr.h> 91 92 #if defined(CRYPTO) 93 #include <crypto/cryptodev.h> 94 #include <crypto/cryptosoft.h> 95 #endif 96 97 #if defined(KUBSAN) 98 extern void kubsan_init(void); 99 #endif 100 101 #if defined(NFSSERVER) || defined(NFSCLIENT) 102 extern void nfs_init(void); 103 #endif 104 105 #include "stoeplitz.h" 106 #if NSTOEPLITZ > 0 107 extern void stoeplitz_init(void); 108 #endif 109 110 #include "mpath.h" 111 #include "vscsi.h" 112 #include "softraid.h" 113 114 const char copyright[] = 115 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 116 "\tThe Regents of the University of California. All rights reserved.\n" 117 "Copyright (c) 1995-2022 OpenBSD. All rights reserved. https://www.OpenBSD.org\n"; 118 119 /* Components of the first process -- never freed. */ 120 struct session session0; 121 struct pgrp pgrp0; 122 struct proc proc0; 123 struct process process0; 124 struct plimit limit0; 125 struct vmspace vmspace0; 126 struct sigacts sigacts0; 127 struct process *initprocess; 128 struct proc *reaperproc; 129 130 extern struct user *proc0paddr; 131 132 struct vnode *rootvp, *swapdev_vp; 133 int boothowto; 134 int db_active = 0; 135 int ncpus = 1; 136 int ncpusfound = 1; /* number of cpus we find */ 137 volatile int start_init_exec; /* semaphore for start_init() */ 138 139 #if !defined(NO_PROPOLICE) 140 long __guard_local __attribute__((section(".openbsd.randomdata"))); 141 #endif 142 143 /* XXX return int so gcc -Werror won't complain */ 144 int main(void *); 145 void check_console(struct proc *); 146 void start_init(void *); 147 void db_ctf_init(void); 148 void prof_init(void); 149 void init_exec(void); 150 void futex_init(void); 151 void taskq_init(void); 152 void timeout_proc_init(void); 153 void pool_gc_pages(void *); 154 void percpu_init(void); 155 156 #ifdef DIAGNOSTIC 157 int pdevinit_done = 0; 158 #endif 159 160 /* 161 * System startup; initialize the world, create process 0, mount root 162 * filesystem, and fork to create init and pagedaemon. Most of the 163 * hard work is done in the lower-level initialization routines including 164 * startup(), which does memory initialization and autoconfiguration. 165 */ 166 /* XXX return int, so gcc -Werror won't complain */ 167 int 168 main(void *framep) 169 { 170 struct proc *p; 171 struct process *pr; 172 struct pdevinit *pdev; 173 extern struct pdevinit pdevinit[]; 174 extern void disk_init(void); 175 176 /* 177 * Initialize the current process pointer (curproc) before 178 * any possible traps/probes to simplify trap processing. 179 */ 180 curproc = p = &proc0; 181 p->p_cpu = curcpu(); 182 183 /* 184 * Initialize timeouts. 185 */ 186 timeout_startup(); 187 188 /* 189 * Attempt to find console and initialize 190 * in case of early panic or other messages. 191 */ 192 config_init(); /* init autoconfiguration data structures */ 193 consinit(); 194 195 printf("%s\n", copyright); 196 197 #ifdef KUBSAN 198 /* Initialize kubsan. */ 199 kubsan_init(); 200 #endif 201 202 WITNESS_INITIALIZE(); 203 204 KERNEL_LOCK_INIT(); 205 SCHED_LOCK_INIT(); 206 207 rw_obj_init(); 208 uvm_init(); 209 disk_init(); /* must come before autoconfiguration */ 210 tty_init(); /* initialise tty's */ 211 cpu_startup(); 212 213 random_start(boothowto & RB_GOODRANDOM); /* Start the flow */ 214 215 /* 216 * Initialize mbuf's. Do this now because we might attempt to 217 * allocate mbufs or mbuf clusters during autoconfiguration. 218 */ 219 mbinit(); 220 221 #if NSTOEPLITZ > 0 222 stoeplitz_init(); 223 #endif 224 225 /* Initialize sockets. */ 226 soinit(); 227 228 /* Initialize SRP subsystem. */ 229 srp_startup(); 230 231 /* Initialize SMR subsystem. */ 232 smr_startup(); 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 * Initialize futexes. 259 */ 260 futex_init(); 261 262 /* Create credentials. */ 263 p->p_ucred = crget(); 264 p->p_ucred->cr_ngroups = 1; /* group 0 */ 265 266 /* 267 * Create process 0 (the swapper). 268 */ 269 pr = &process0; 270 process_initialize(pr, p); 271 272 LIST_INSERT_HEAD(&allprocess, pr, ps_list); 273 LIST_INSERT_HEAD(PIDHASH(0), pr, ps_hash); 274 atomic_setbits_int(&pr->ps_flags, PS_SYSTEM); 275 276 /* Set the default routing table/domain. */ 277 process0.ps_rtableid = 0; 278 279 LIST_INSERT_HEAD(&allproc, p, p_list); 280 pr->ps_pgrp = &pgrp0; 281 LIST_INSERT_HEAD(TIDHASH(0), p, p_hash); 282 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 283 LIST_INIT(&pgrp0.pg_members); 284 LIST_INSERT_HEAD(&pgrp0.pg_members, pr, ps_pglist); 285 286 pgrp0.pg_session = &session0; 287 session0.s_count = 1; 288 session0.s_leader = pr; 289 290 atomic_setbits_int(&p->p_flag, P_SYSTEM); 291 p->p_stat = SONPROC; 292 pr->ps_nice = NZERO; 293 strlcpy(pr->ps_comm, "swapper", sizeof(pr->ps_comm)); 294 295 /* Init timeouts. */ 296 timeout_set(&p->p_sleep_to, endtsleep, p); 297 298 /* Initialize signal state for process 0. */ 299 signal_init(); 300 siginit(&sigacts0); 301 pr->ps_sigacts = &sigacts0; 302 303 /* Create the file descriptor table. */ 304 p->p_fd = pr->ps_fd = fdinit(); 305 306 /* Create the limits structures. */ 307 lim_startup(&limit0); 308 pr->ps_limit = &limit0; 309 310 /* Allocate a prototype map so we have something to fork. */ 311 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 312 trunc_page(VM_MAX_ADDRESS), TRUE, TRUE); 313 p->p_vmspace = pr->ps_vmspace = &vmspace0; 314 315 p->p_addr = proc0paddr; /* XXX */ 316 317 /* 318 * Charge root for one process. 319 */ 320 (void)chgproccnt(0, 1); 321 322 /* Initialize run queues */ 323 sched_init_runqueues(); 324 sleep_queue_init(); 325 sched_init_cpu(curcpu()); 326 p->p_cpu->ci_randseed = (arc4random() & 0x7fffffff) + 1; 327 328 /* Initialize timeouts in process context. */ 329 timeout_proc_init(); 330 331 /* Initialize task queues */ 332 taskq_init(); 333 334 /* Initialize the interface/address trees */ 335 ifinit(); 336 337 /* Lock the kernel on behalf of proc0. */ 338 KERNEL_LOCK(); 339 340 #if NMPATH > 0 341 /* Attach mpath before hardware */ 342 config_rootfound("mpath", NULL); 343 #endif 344 345 /* Configure the devices */ 346 cpu_configure(); 347 348 /* Configure virtual memory system, set vm rlimits. */ 349 uvm_init_limits(&limit0); 350 351 /* Per CPU memory allocation */ 352 percpu_init(); 353 354 /* Initialize the file systems. */ 355 #if defined(NFSSERVER) || defined(NFSCLIENT) 356 nfs_init(); /* initialize server/shared data */ 357 #endif 358 vfsinit(); 359 360 /* Start real time and statistics clocks. */ 361 initclocks(); 362 363 #ifdef SYSVSHM 364 /* Initialize System V style shared memory. */ 365 shminit(); 366 #endif 367 368 #ifdef SYSVSEM 369 /* Initialize System V style semaphores. */ 370 seminit(); 371 #endif 372 373 #ifdef SYSVMSG 374 /* Initialize System V style message queues. */ 375 msginit(); 376 #endif 377 378 /* Create default routing table before attaching lo0. */ 379 rtable_init(); 380 381 /* Attach pseudo-devices. */ 382 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 383 if (pdev->pdev_count > 0) 384 (*pdev->pdev_attach)(pdev->pdev_count); 385 #ifdef DIAGNOSTIC 386 pdevinit_done = 1; 387 #endif 388 389 #ifdef CRYPTO 390 crypto_init(); 391 swcr_init(); 392 #endif /* CRYPTO */ 393 394 /* 395 * Initialize protocols. 396 */ 397 domaininit(); 398 399 initconsbuf(); 400 401 #if defined(GPROF) || defined(DDBPROF) 402 /* Initialize kernel profiling. */ 403 prof_init(); 404 #endif 405 406 /* Enable per-CPU data. */ 407 mbcpuinit(); 408 kqueue_init_percpu(); 409 uvm_init_percpu(); 410 411 /* init exec */ 412 init_exec(); 413 414 /* Start the scheduler */ 415 scheduler_start(); 416 417 /* 418 * Create process 1 (init(8)). We do this now, as Unix has 419 * historically had init be process 1, and changing this would 420 * probably upset a lot of people. 421 * 422 * Note that process 1 won't immediately exec init(8), but will 423 * wait for us to inform it that the root file system has been 424 * mounted. 425 */ 426 { 427 struct proc *initproc; 428 429 if (fork1(p, FORK_FORK, start_init, NULL, NULL, &initproc)) 430 panic("fork init"); 431 initprocess = initproc->p_p; 432 } 433 434 randompid = 1; 435 436 /* 437 * Create any kernel threads whose creation was deferred because 438 * initprocess had not yet been created. 439 */ 440 kthread_run_deferred_queue(); 441 442 /* 443 * Now that device driver threads have been created, wait for 444 * them to finish any deferred autoconfiguration. Note we don't 445 * need to lock this semaphore, since we haven't booted any 446 * secondary processors, yet. 447 */ 448 while (config_pending) 449 tsleep_nsec(&config_pending, PWAIT, "cfpend", INFSLP); 450 451 dostartuphooks(); 452 453 #if NVSCSI > 0 454 config_rootfound("vscsi", NULL); 455 #endif 456 #if NSOFTRAID > 0 457 config_rootfound("softraid", NULL); 458 #endif 459 460 /* Configure root/swap devices */ 461 diskconf(); 462 463 #ifdef DDB 464 /* Make debug symbols available in ddb. */ 465 db_ctf_init(); 466 #endif 467 468 if (mountroot == NULL || ((*mountroot)() != 0)) 469 panic("cannot mount root"); 470 471 TAILQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 472 473 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 474 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 475 panic("cannot find root vnode"); 476 p->p_fd->fd_cdir = rootvnode; 477 vref(p->p_fd->fd_cdir); 478 VOP_UNLOCK(rootvnode); 479 p->p_fd->fd_rdir = NULL; 480 481 /* 482 * Now that root is mounted, we can fixup initprocess's CWD 483 * info. All other processes are kthreads, which merely 484 * share proc0's CWD info. 485 */ 486 initprocess->ps_fd->fd_cdir = rootvnode; 487 vref(initprocess->ps_fd->fd_cdir); 488 initprocess->ps_fd->fd_rdir = NULL; 489 490 /* 491 * Now can look at time, having had a chance to verify the time 492 * from the file system. Reset p->p_rtime as it may have been 493 * munched in mi_switch() after the time got set. 494 */ 495 LIST_FOREACH(pr, &allprocess, ps_list) { 496 nanouptime(&pr->ps_start); 497 TAILQ_FOREACH(p, &pr->ps_threads, p_thr_link) { 498 nanouptime(&p->p_cpu->ci_schedstate.spc_runtime); 499 timespecclear(&p->p_rtime); 500 } 501 } 502 503 uvm_swap_init(); 504 505 /* Create the pageout daemon kernel thread. */ 506 if (kthread_create(uvm_pageout, NULL, NULL, "pagedaemon")) 507 panic("fork pagedaemon"); 508 509 /* Create the reaper daemon kernel thread. */ 510 if (kthread_create(reaper, NULL, &reaperproc, "reaper")) 511 panic("fork reaper"); 512 513 /* Create the cleaner daemon kernel thread. */ 514 if (kthread_create(buf_daemon, NULL, &cleanerproc, "cleaner")) 515 panic("fork cleaner"); 516 517 /* Create the update daemon kernel thread. */ 518 if (kthread_create(syncer_thread, NULL, &syncerproc, "update")) 519 panic("fork update"); 520 521 /* Create the aiodone daemon kernel thread. */ 522 if (kthread_create(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 523 panic("fork aiodoned"); 524 525 #if !defined(__hppa__) 526 /* Create the page zeroing kernel thread. */ 527 if (kthread_create(uvm_pagezero_thread, NULL, NULL, "zerothread")) 528 panic("fork zerothread"); 529 #endif 530 531 #if defined(MULTIPROCESSOR) 532 /* Boot the secondary processors. */ 533 cpu_boot_secondary_processors(); 534 #endif 535 536 /* Now that all CPUs partake in scheduling, start SMR thread. */ 537 smr_startup_thread(); 538 539 config_process_deferred_mountroot(); 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 * Start the idle pool page garbage collector 549 */ 550 #if !(defined(__m88k__) && defined(MULTIPROCESSOR)) /* XXX */ 551 pool_gc_pages(NULL); 552 #endif 553 554 start_periodic_resettodr(); 555 556 /* 557 * proc0: nothing to do, back to sleep 558 */ 559 while (1) 560 tsleep_nsec(&proc0, PVM, "scheduler", INFSLP); 561 /* NOTREACHED */ 562 } 563 564 /* 565 * List of paths to try when searching for "init". 566 */ 567 static char *initpaths[] = { 568 "/sbin/init", 569 "/sbin/oinit", 570 "/sbin/init.bak", 571 NULL, 572 }; 573 574 void 575 check_console(struct proc *p) 576 { 577 struct nameidata nd; 578 int error; 579 580 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 581 error = namei(&nd); 582 if (error) { 583 if (error == ENOENT) 584 printf("warning: /dev/console does not exist\n"); 585 else 586 printf("warning: /dev/console error %d\n", error); 587 } else 588 vrele(nd.ni_vp); 589 } 590 591 /* 592 * Start the initial user process; try exec'ing each pathname in "initpaths". 593 * The program is invoked with one argument containing the boot flags. 594 */ 595 void 596 start_init(void *arg) 597 { 598 struct proc *p = arg; 599 vaddr_t addr; 600 struct sys_execve_args /* { 601 syscallarg(const char *) path; 602 syscallarg(char *const *) argp; 603 syscallarg(char *const *) envp; 604 } */ args; 605 int options, error; 606 long i; 607 register_t retval[2]; 608 char flags[4], *flagsp; 609 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 610 611 /* 612 * Now in process 1. 613 */ 614 615 /* 616 * Wait for main() to tell us that it's safe to exec. 617 */ 618 while (start_init_exec == 0) 619 tsleep_nsec(&start_init_exec, PWAIT, "initexec", INFSLP); 620 621 check_console(p); 622 623 /* process 0 ignores SIGCHLD, but we can't */ 624 p->p_p->ps_sigacts->ps_sigflags = 0; 625 626 /* 627 * Need just enough stack to hold the faked-up "execve()" arguments. 628 */ 629 #ifdef MACHINE_STACK_GROWS_UP 630 addr = USRSTACK; 631 #else 632 addr = USRSTACK - PAGE_SIZE; 633 #endif 634 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 635 p->p_vmspace->vm_minsaddr = (caddr_t)(addr + PAGE_SIZE); 636 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 637 NULL, UVM_UNKNOWN_OFFSET, 0, 638 UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_MASK, MAP_INHERIT_COPY, 639 MADV_NORMAL, 640 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW|UVM_FLAG_STACK|UVM_FLAG_SYSCALL))) 641 panic("init: couldn't allocate argument space"); 642 643 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 644 #ifdef MACHINE_STACK_GROWS_UP 645 ucp = (char *)addr; 646 #else 647 ucp = (char *)(addr + PAGE_SIZE); 648 #endif 649 /* 650 * Construct the boot flag argument. 651 */ 652 flagsp = flags; 653 *flagsp++ = '-'; 654 options = 0; 655 656 if (boothowto & RB_SINGLE) { 657 *flagsp++ = 's'; 658 options = 1; 659 } 660 #ifdef notyet 661 if (boothowto & RB_FASTBOOT) { 662 *flagsp++ = 'f'; 663 options = 1; 664 } 665 #endif 666 667 /* 668 * Move out the flags (arg 1), if necessary. 669 */ 670 if (options != 0) { 671 *flagsp++ = '\0'; 672 i = flagsp - flags; 673 #ifdef DEBUG 674 printf("init: copying out flags `%s' %ld\n", flags, i); 675 #endif 676 #ifdef MACHINE_STACK_GROWS_UP 677 arg1 = ucp; 678 (void)copyout((caddr_t)flags, (caddr_t)ucp, i); 679 ucp += i; 680 #else 681 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 682 arg1 = ucp; 683 #endif 684 } 685 686 /* 687 * Move out the file name (also arg 0). 688 */ 689 i = strlen(path) + 1; 690 #ifdef DEBUG 691 printf("init: copying out path `%s' %ld\n", path, i); 692 #endif 693 #ifdef MACHINE_STACK_GROWS_UP 694 arg0 = ucp; 695 (void)copyout((caddr_t)path, (caddr_t)ucp, i); 696 ucp += i; 697 ucp = (caddr_t)ALIGN((u_long)ucp); 698 uap = (char **)ucp + 3; 699 #else 700 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 701 arg0 = ucp; 702 uap = (char **)((u_long)ucp & ~ALIGNBYTES); 703 #endif 704 705 /* 706 * Move out the arg pointers. 707 */ 708 i = 0; 709 copyout(&i, (caddr_t)--uap, sizeof(register_t)); /* terminator */ 710 if (options != 0) 711 copyout(&arg1, (caddr_t)--uap, sizeof(register_t)); 712 copyout(&arg0, (caddr_t)--uap, sizeof(register_t)); 713 714 /* 715 * Point at the arguments. 716 */ 717 SCARG(&args, path) = arg0; 718 SCARG(&args, argp) = uap; 719 SCARG(&args, envp) = NULL; 720 721 /* 722 * Now try to exec the program. If can't for any reason 723 * other than it doesn't exist, complain. 724 */ 725 if ((error = sys_execve(p, &args, retval)) == 0) { 726 KERNEL_UNLOCK(); 727 return; 728 } 729 if (error != ENOENT) 730 printf("exec %s: error %d\n", path, error); 731 } 732 printf("init: not found\n"); 733 panic("no init"); 734 } 735