1 /* $OpenBSD: init_main.c,v 1.296 2020/02/25 16:55:33 visa 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/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 <dev/rndvar.h> 87 88 #include <ufs/ufs/quota.h> 89 90 #include <net/if.h> 91 #include <net/rtable.h> 92 #include <net/netisr.h> 93 94 #if defined(CRYPTO) 95 #include <crypto/cryptodev.h> 96 #include <crypto/cryptosoft.h> 97 #endif 98 99 #if defined(KUBSAN) 100 extern void kubsan_init(void); 101 #endif 102 103 #if defined(NFSSERVER) || defined(NFSCLIENT) 104 extern void nfs_init(void); 105 #endif 106 107 #include "mpath.h" 108 #include "vscsi.h" 109 #include "softraid.h" 110 111 const char copyright[] = 112 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 113 "\tThe Regents of the University of California. All rights reserved.\n" 114 "Copyright (c) 1995-2020 OpenBSD. All rights reserved. https://www.OpenBSD.org\n"; 115 116 /* Components of the first process -- never freed. */ 117 struct session session0; 118 struct pgrp pgrp0; 119 struct proc proc0; 120 struct process process0; 121 struct plimit limit0; 122 struct vmspace vmspace0; 123 struct sigacts sigacts0; 124 struct process *initprocess; 125 struct proc *reaperproc; 126 127 extern struct user *proc0paddr; 128 129 struct vnode *rootvp, *swapdev_vp; 130 int boothowto; 131 int db_active = 0; 132 int ncpus = 1; 133 int ncpusfound = 1; /* number of cpus we find */ 134 volatile int start_init_exec; /* semaphore for start_init() */ 135 136 #if !defined(NO_PROPOLICE) 137 long __guard_local __attribute__((section(".openbsd.randomdata"))); 138 #endif 139 140 /* XXX return int so gcc -Werror won't complain */ 141 int main(void *); 142 void check_console(struct proc *); 143 void start_init(void *); 144 void crypto_init(void); 145 void db_ctf_init(void); 146 void prof_init(void); 147 void init_exec(void); 148 void kqueue_init(void); 149 void futex_init(void); 150 void taskq_init(void); 151 void timeout_proc_init(void); 152 void pool_gc_pages(void *); 153 void percpu_init(void); 154 155 extern char sigcode[], esigcode[], sigcoderet[]; 156 #ifdef SYSCALL_DEBUG 157 extern char *syscallnames[]; 158 #endif 159 160 struct emul emul_native = { 161 "native", 162 NULL, 163 SYS_syscall, 164 SYS_MAXSYSCALL, 165 sysent, 166 #ifdef SYSCALL_DEBUG 167 syscallnames, 168 #else 169 NULL, 170 #endif 171 0, 172 copyargs, 173 setregs, 174 NULL, /* fixup */ 175 NULL, /* coredump */ 176 sigcode, 177 esigcode, 178 sigcoderet 179 }; 180 181 #ifdef DIAGNOSTIC 182 int pdevinit_done = 0; 183 #endif 184 185 /* 186 * System startup; initialize the world, create process 0, mount root 187 * filesystem, and fork to create init and pagedaemon. Most of the 188 * hard work is done in the lower-level initialization routines including 189 * startup(), which does memory initialization and autoconfiguration. 190 */ 191 /* XXX return int, so gcc -Werror won't complain */ 192 int 193 main(void *framep) 194 { 195 struct proc *p; 196 struct process *pr; 197 struct pdevinit *pdev; 198 extern struct pdevinit pdevinit[]; 199 extern void disk_init(void); 200 201 /* 202 * Initialize the current process pointer (curproc) before 203 * any possible traps/probes to simplify trap processing. 204 */ 205 curproc = p = &proc0; 206 p->p_cpu = curcpu(); 207 208 /* 209 * Initialize timeouts. 210 */ 211 timeout_startup(); 212 213 /* 214 * Attempt to find console and initialize 215 * in case of early panic or other messages. 216 */ 217 config_init(); /* init autoconfiguration data structures */ 218 consinit(); 219 220 printf("%s\n", copyright); 221 222 #ifdef KUBSAN 223 /* Initialize kubsan. */ 224 kubsan_init(); 225 #endif 226 227 WITNESS_INITIALIZE(); 228 229 KERNEL_LOCK_INIT(); 230 SCHED_LOCK_INIT(); 231 232 uvm_init(); 233 disk_init(); /* must come before autoconfiguration */ 234 tty_init(); /* initialise tty's */ 235 cpu_startup(); 236 237 random_start(); /* Start the flow */ 238 239 /* 240 * Initialize mbuf's. Do this now because we might attempt to 241 * allocate mbufs or mbuf clusters during autoconfiguration. 242 */ 243 mbinit(); 244 245 /* Initialize sockets. */ 246 soinit(); 247 248 /* Initialize SRP subsystem. */ 249 srp_startup(); 250 251 /* Initialize SMR subsystem. */ 252 smr_startup(); 253 254 /* 255 * Initialize process and pgrp structures. 256 */ 257 procinit(); 258 259 /* Initialize file locking. */ 260 lf_init(); 261 262 /* 263 * Initialize filedescriptors. 264 */ 265 filedesc_init(); 266 267 /* 268 * Initialize pipes. 269 */ 270 pipe_init(); 271 272 /* 273 * Initialize kqueues. 274 */ 275 kqueue_init(); 276 277 /* 278 * Initialize futexes. 279 */ 280 futex_init(); 281 282 /* Create credentials. */ 283 p->p_ucred = crget(); 284 p->p_ucred->cr_ngroups = 1; /* group 0 */ 285 286 /* 287 * Create process 0 (the swapper). 288 */ 289 pr = &process0; 290 process_initialize(pr, p); 291 292 LIST_INSERT_HEAD(&allprocess, pr, ps_list); 293 LIST_INSERT_HEAD(PIDHASH(0), pr, ps_hash); 294 atomic_setbits_int(&pr->ps_flags, PS_SYSTEM); 295 296 /* Set the default routing table/domain. */ 297 process0.ps_rtableid = 0; 298 299 LIST_INSERT_HEAD(&allproc, p, p_list); 300 pr->ps_pgrp = &pgrp0; 301 LIST_INSERT_HEAD(TIDHASH(0), p, p_hash); 302 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 303 LIST_INIT(&pgrp0.pg_members); 304 LIST_INSERT_HEAD(&pgrp0.pg_members, pr, ps_pglist); 305 306 pgrp0.pg_session = &session0; 307 session0.s_count = 1; 308 session0.s_leader = pr; 309 310 atomic_setbits_int(&p->p_flag, P_SYSTEM); 311 p->p_stat = SONPROC; 312 pr->ps_nice = NZERO; 313 pr->ps_emul = &emul_native; 314 strlcpy(pr->ps_comm, "swapper", sizeof(pr->ps_comm)); 315 316 /* Init timeouts. */ 317 timeout_set(&p->p_sleep_to, endtsleep, p); 318 319 /* Initialize signal state for process 0. */ 320 signal_init(); 321 pr->ps_sigacts = &sigacts0; 322 siginit(pr); 323 324 /* Create the file descriptor table. */ 325 p->p_fd = pr->ps_fd = fdinit(); 326 327 /* Create the limits structures. */ 328 lim_startup(&limit0); 329 pr->ps_limit = &limit0; 330 331 /* Allocate a prototype map so we have something to fork. */ 332 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 333 trunc_page(VM_MAX_ADDRESS), TRUE, TRUE); 334 p->p_vmspace = pr->ps_vmspace = &vmspace0; 335 336 p->p_addr = proc0paddr; /* XXX */ 337 338 /* 339 * Charge root for one process. 340 */ 341 (void)chgproccnt(0, 1); 342 343 /* Initialize run queues */ 344 sched_init_runqueues(); 345 sleep_queue_init(); 346 sched_init_cpu(curcpu()); 347 p->p_cpu->ci_randseed = (arc4random() & 0x7fffffff) + 1; 348 349 /* Initialize timeouts in process context. */ 350 timeout_proc_init(); 351 352 /* Initialize task queues */ 353 taskq_init(); 354 355 /* Initialize the interface/address trees */ 356 ifinit(); 357 358 /* Lock the kernel on behalf of proc0. */ 359 KERNEL_LOCK(); 360 361 #if NMPATH > 0 362 /* Attach mpath before hardware */ 363 config_rootfound("mpath", NULL); 364 #endif 365 366 /* Configure the devices */ 367 cpu_configure(); 368 369 /* Configure virtual memory system, set vm rlimits. */ 370 uvm_init_limits(&limit0); 371 372 /* Per CPU memory allocation */ 373 percpu_init(); 374 375 /* Initialize the file systems. */ 376 #if defined(NFSSERVER) || defined(NFSCLIENT) 377 nfs_init(); /* initialize server/shared data */ 378 #endif 379 vfsinit(); 380 381 /* Start real time and statistics clocks. */ 382 initclocks(); 383 384 #ifdef SYSVSHM 385 /* Initialize System V style shared memory. */ 386 shminit(); 387 #endif 388 389 #ifdef SYSVSEM 390 /* Initialize System V style semaphores. */ 391 seminit(); 392 #endif 393 394 #ifdef SYSVMSG 395 /* Initialize System V style message queues. */ 396 msginit(); 397 #endif 398 399 /* Create default routing table before attaching lo0. */ 400 rtable_init(); 401 402 /* Attach pseudo-devices. */ 403 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 404 if (pdev->pdev_count > 0) 405 (*pdev->pdev_attach)(pdev->pdev_count); 406 #ifdef DIAGNOSTIC 407 pdevinit_done = 1; 408 #endif 409 410 #ifdef CRYPTO 411 crypto_init(); 412 swcr_init(); 413 #endif /* CRYPTO */ 414 415 /* 416 * Initialize protocols. 417 */ 418 domaininit(); 419 420 initconsbuf(); 421 422 #if defined(GPROF) || defined(DDBPROF) 423 /* Initialize kernel profiling. */ 424 prof_init(); 425 #endif 426 427 mbcpuinit(); /* enable per cpu mbuf data */ 428 429 /* init exec and emul */ 430 init_exec(); 431 432 /* Start the scheduler */ 433 scheduler_start(); 434 435 /* 436 * Create process 1 (init(8)). We do this now, as Unix has 437 * historically had init be process 1, and changing this would 438 * probably upset a lot of people. 439 * 440 * Note that process 1 won't immediately exec init(8), but will 441 * wait for us to inform it that the root file system has been 442 * mounted. 443 */ 444 { 445 struct proc *initproc; 446 447 if (fork1(p, FORK_FORK, start_init, NULL, NULL, &initproc)) 448 panic("fork init"); 449 initprocess = initproc->p_p; 450 } 451 452 randompid = 1; 453 454 /* 455 * Create any kernel threads whose creation was deferred because 456 * initprocess had not yet been created. 457 */ 458 kthread_run_deferred_queue(); 459 460 /* 461 * Now that device driver threads have been created, wait for 462 * them to finish any deferred autoconfiguration. Note we don't 463 * need to lock this semaphore, since we haven't booted any 464 * secondary processors, yet. 465 */ 466 while (config_pending) 467 tsleep_nsec(&config_pending, PWAIT, "cfpend", INFSLP); 468 469 dostartuphooks(); 470 471 #if NVSCSI > 0 472 config_rootfound("vscsi", NULL); 473 #endif 474 #if NSOFTRAID > 0 475 config_rootfound("softraid", NULL); 476 #endif 477 478 /* Configure root/swap devices */ 479 diskconf(); 480 481 #ifdef DDB 482 /* Make debug symbols available in ddb. */ 483 db_ctf_init(); 484 #endif 485 486 if (mountroot == NULL || ((*mountroot)() != 0)) 487 panic("cannot mount root"); 488 489 TAILQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 490 491 /* Get the vnode for '/'. Set p->p_fd->fd_cdir to reference it. */ 492 if (VFS_ROOT(TAILQ_FIRST(&mountlist), &rootvnode)) 493 panic("cannot find root vnode"); 494 p->p_fd->fd_cdir = rootvnode; 495 vref(p->p_fd->fd_cdir); 496 VOP_UNLOCK(rootvnode); 497 p->p_fd->fd_rdir = NULL; 498 499 /* 500 * Now that root is mounted, we can fixup initprocess's CWD 501 * info. All other processes are kthreads, which merely 502 * share proc0's CWD info. 503 */ 504 initprocess->ps_fd->fd_cdir = rootvnode; 505 vref(initprocess->ps_fd->fd_cdir); 506 initprocess->ps_fd->fd_rdir = NULL; 507 508 /* 509 * Now can look at time, having had a chance to verify the time 510 * from the file system. Reset p->p_rtime as it may have been 511 * munched in mi_switch() after the time got set. 512 */ 513 LIST_FOREACH(pr, &allprocess, ps_list) { 514 nanouptime(&pr->ps_start); 515 TAILQ_FOREACH(p, &pr->ps_threads, p_thr_link) { 516 nanouptime(&p->p_cpu->ci_schedstate.spc_runtime); 517 timespecclear(&p->p_rtime); 518 } 519 } 520 521 uvm_swap_init(); 522 523 /* Create the pageout daemon kernel thread. */ 524 if (kthread_create(uvm_pageout, NULL, NULL, "pagedaemon")) 525 panic("fork pagedaemon"); 526 527 /* Create the reaper daemon kernel thread. */ 528 if (kthread_create(reaper, NULL, &reaperproc, "reaper")) 529 panic("fork reaper"); 530 531 /* Create the cleaner daemon kernel thread. */ 532 if (kthread_create(buf_daemon, NULL, &cleanerproc, "cleaner")) 533 panic("fork cleaner"); 534 535 /* Create the update daemon kernel thread. */ 536 if (kthread_create(syncer_thread, NULL, &syncerproc, "update")) 537 panic("fork update"); 538 539 /* Create the aiodone daemon kernel thread. */ 540 if (kthread_create(uvm_aiodone_daemon, NULL, NULL, "aiodoned")) 541 panic("fork aiodoned"); 542 543 #if !defined(__hppa__) 544 /* Create the page zeroing kernel thread. */ 545 if (kthread_create(uvm_pagezero_thread, NULL, NULL, "zerothread")) 546 panic("fork zerothread"); 547 #endif 548 549 #if defined(MULTIPROCESSOR) 550 /* Boot the secondary processors. */ 551 cpu_boot_secondary_processors(); 552 #endif 553 554 /* Now that all CPUs partake in scheduling, start SMR thread. */ 555 smr_startup_thread(); 556 557 config_process_deferred_mountroot(); 558 559 /* 560 * Okay, now we can let init(8) exec! It's off to userland! 561 */ 562 start_init_exec = 1; 563 wakeup((void *)&start_init_exec); 564 565 /* 566 * Start the idle pool page garbage collector 567 */ 568 #if !(defined(__m88k__) && defined(MULTIPROCESSOR)) /* XXX */ 569 pool_gc_pages(NULL); 570 #endif 571 572 start_periodic_resettodr(); 573 574 /* 575 * proc0: nothing to do, back to sleep 576 */ 577 while (1) 578 tsleep_nsec(&proc0, PVM, "scheduler", INFSLP); 579 /* NOTREACHED */ 580 } 581 582 /* 583 * List of paths to try when searching for "init". 584 */ 585 static char *initpaths[] = { 586 "/sbin/init", 587 "/sbin/oinit", 588 "/sbin/init.bak", 589 NULL, 590 }; 591 592 void 593 check_console(struct proc *p) 594 { 595 struct nameidata nd; 596 int error; 597 598 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 599 error = namei(&nd); 600 if (error) { 601 if (error == ENOENT) 602 printf("warning: /dev/console does not exist\n"); 603 else 604 printf("warning: /dev/console error %d\n", error); 605 } else 606 vrele(nd.ni_vp); 607 } 608 609 /* 610 * Start the initial user process; try exec'ing each pathname in "initpaths". 611 * The program is invoked with one argument containing the boot flags. 612 */ 613 void 614 start_init(void *arg) 615 { 616 struct proc *p = arg; 617 vaddr_t addr; 618 struct sys_execve_args /* { 619 syscallarg(const char *) path; 620 syscallarg(char *const *) argp; 621 syscallarg(char *const *) envp; 622 } */ args; 623 int options, error; 624 long i; 625 register_t retval[2]; 626 char flags[4], *flagsp; 627 char **pathp, *path, *ucp, **uap, *arg0, *arg1 = NULL; 628 629 /* 630 * Now in process 1. 631 */ 632 633 /* 634 * Wait for main() to tell us that it's safe to exec. 635 */ 636 while (start_init_exec == 0) 637 tsleep_nsec(&start_init_exec, PWAIT, "initexec", INFSLP); 638 639 check_console(p); 640 641 /* process 0 ignores SIGCHLD, but we can't */ 642 p->p_p->ps_sigacts->ps_flags = 0; 643 644 /* 645 * Need just enough stack to hold the faked-up "execve()" arguments. 646 */ 647 #ifdef MACHINE_STACK_GROWS_UP 648 addr = USRSTACK; 649 #else 650 addr = USRSTACK - PAGE_SIZE; 651 #endif 652 p->p_vmspace->vm_maxsaddr = (caddr_t)addr; 653 p->p_vmspace->vm_minsaddr = (caddr_t)(addr + PAGE_SIZE); 654 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 655 NULL, UVM_UNKNOWN_OFFSET, 0, 656 UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_MASK, MAP_INHERIT_COPY, 657 MADV_NORMAL, 658 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW|UVM_FLAG_STACK|UVM_FLAG_SYSCALL))) 659 panic("init: couldn't allocate argument space"); 660 661 for (pathp = &initpaths[0]; (path = *pathp) != NULL; pathp++) { 662 #ifdef MACHINE_STACK_GROWS_UP 663 ucp = (char *)addr; 664 #else 665 ucp = (char *)(addr + PAGE_SIZE); 666 #endif 667 /* 668 * Construct the boot flag argument. 669 */ 670 flagsp = flags; 671 *flagsp++ = '-'; 672 options = 0; 673 674 if (boothowto & RB_SINGLE) { 675 *flagsp++ = 's'; 676 options = 1; 677 } 678 #ifdef notyet 679 if (boothowto & RB_FASTBOOT) { 680 *flagsp++ = 'f'; 681 options = 1; 682 } 683 #endif 684 685 /* 686 * Move out the flags (arg 1), if necessary. 687 */ 688 if (options != 0) { 689 *flagsp++ = '\0'; 690 i = flagsp - flags; 691 #ifdef DEBUG 692 printf("init: copying out flags `%s' %ld\n", flags, i); 693 #endif 694 #ifdef MACHINE_STACK_GROWS_UP 695 arg1 = ucp; 696 (void)copyout((caddr_t)flags, (caddr_t)ucp, i); 697 ucp += i; 698 #else 699 (void)copyout((caddr_t)flags, (caddr_t)(ucp -= i), i); 700 arg1 = ucp; 701 #endif 702 } 703 704 /* 705 * Move out the file name (also arg 0). 706 */ 707 i = strlen(path) + 1; 708 #ifdef DEBUG 709 printf("init: copying out path `%s' %ld\n", path, i); 710 #endif 711 #ifdef MACHINE_STACK_GROWS_UP 712 arg0 = ucp; 713 (void)copyout((caddr_t)path, (caddr_t)ucp, i); 714 ucp += i; 715 ucp = (caddr_t)ALIGN((u_long)ucp); 716 uap = (char **)ucp + 3; 717 #else 718 (void)copyout((caddr_t)path, (caddr_t)(ucp -= i), i); 719 arg0 = ucp; 720 uap = (char **)((u_long)ucp & ~ALIGNBYTES); 721 #endif 722 723 /* 724 * Move out the arg pointers. 725 */ 726 i = 0; 727 copyout(&i, (caddr_t)--uap, sizeof(register_t)); /* terminator */ 728 if (options != 0) 729 copyout(&arg1, (caddr_t)--uap, sizeof(register_t)); 730 copyout(&arg0, (caddr_t)--uap, sizeof(register_t)); 731 732 /* 733 * Point at the arguments. 734 */ 735 SCARG(&args, path) = arg0; 736 SCARG(&args, argp) = uap; 737 SCARG(&args, envp) = NULL; 738 739 /* 740 * Now try to exec the program. If can't for any reason 741 * other than it doesn't exist, complain. 742 */ 743 if ((error = sys_execve(p, &args, retval)) == 0) { 744 KERNEL_UNLOCK(); 745 return; 746 } 747 if (error != ENOENT) 748 printf("exec %s: error %d\n", path, error); 749 } 750 printf("init: not found\n"); 751 panic("no init"); 752 } 753