1 /* $NetBSD: init_main.c,v 1.213 2002/12/05 10:30:00 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.213 2002/12/05 10:30:00 yamt Exp $"); 46 47 #include "fs_nfs.h" 48 #include "opt_nfsserver.h" 49 #include "opt_sysv.h" 50 #include "opt_maxuprc.h" 51 #include "opt_multiprocessor.h" 52 #include "opt_pipe.h" 53 #include "opt_syscall_debug.h" 54 #include "opt_systrace.h" 55 56 #include "rnd.h" 57 58 #include <sys/param.h> 59 #include <sys/acct.h> 60 #include <sys/filedesc.h> 61 #include <sys/file.h> 62 #include <sys/errno.h> 63 #include <sys/callout.h> 64 #include <sys/kernel.h> 65 #include <sys/mount.h> 66 #include <sys/proc.h> 67 #include <sys/kthread.h> 68 #include <sys/resourcevar.h> 69 #include <sys/signalvar.h> 70 #include <sys/systm.h> 71 #include <sys/vnode.h> 72 #include <sys/tty.h> 73 #include <sys/conf.h> 74 #include <sys/disklabel.h> 75 #include <sys/buf.h> 76 #include <sys/device.h> 77 #include <sys/disk.h> 78 #include <sys/exec.h> 79 #include <sys/socketvar.h> 80 #include <sys/protosw.h> 81 #include <sys/reboot.h> 82 #include <sys/user.h> 83 #include <sys/sysctl.h> 84 #include <sys/event.h> 85 #ifdef SYSVSHM 86 #include <sys/shm.h> 87 #endif 88 #ifdef SYSVSEM 89 #include <sys/sem.h> 90 #endif 91 #ifdef SYSVMSG 92 #include <sys/msg.h> 93 #endif 94 #ifdef SYSTRACE 95 #include <sys/systrace.h> 96 #endif 97 #include <sys/domain.h> 98 #include <sys/mbuf.h> 99 #include <sys/namei.h> 100 #if NRND > 0 101 #include <sys/rnd.h> 102 #endif 103 #ifndef PIPE_SOCKETPAIR 104 #include <sys/pipe.h> 105 #endif 106 #ifdef LKM 107 #include <sys/lkm.h> 108 #endif 109 110 #include <sys/syscall.h> 111 #include <sys/syscallargs.h> 112 113 #include <ufs/ufs/quota.h> 114 115 #include <miscfs/genfs/genfs.h> 116 #include <miscfs/syncfs/syncfs.h> 117 118 #include <machine/cpu.h> 119 120 #include <uvm/uvm.h> 121 122 #include <dev/cons.h> 123 124 #include <net/if.h> 125 #include <net/raw_cb.h> 126 127 const char copyright[] = 128 "Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002\n" 129 " The NetBSD Foundation, Inc. All rights reserved.\n" 130 "Copyright (c) 1982, 1986, 1989, 1991, 1993\n" 131 " The Regents of the University of California. All rights reserved.\n" 132 "\n"; 133 134 /* Components of the first process -- never freed. */ 135 struct session session0; 136 struct pgrp pgrp0; 137 struct proc proc0; 138 struct pcred cred0; 139 struct filedesc0 filedesc0; 140 struct cwdinfo cwdi0; 141 struct plimit limit0; 142 struct vmspace vmspace0; 143 struct sigacts sigacts0; 144 #ifndef curproc 145 struct proc *curproc = &proc0; 146 #endif 147 struct proc *initproc; 148 149 int cmask = CMASK; 150 extern struct user *proc0paddr; 151 152 struct vnode *rootvp, *swapdev_vp; 153 int boothowto; 154 int cold = 1; /* still working on startup */ 155 struct timeval boottime; 156 157 __volatile int start_init_exec; /* semaphore for start_init() */ 158 159 static void check_console(struct proc *p); 160 static void start_init(void *); 161 void main(void); 162 163 extern const struct emul emul_netbsd; /* defined in kern_exec.c */ 164 165 /* 166 * System startup; initialize the world, create process 0, mount root 167 * filesystem, and fork to create init and pagedaemon. Most of the 168 * hard work is done in the lower-level initialization routines including 169 * startup(), which does memory initialization and autoconfiguration. 170 */ 171 void 172 main(void) 173 { 174 struct proc *p; 175 struct pdevinit *pdev; 176 int s, error; 177 u_int i; 178 rlim_t lim; 179 extern struct pdevinit pdevinit[]; 180 extern void schedcpu(void *); 181 #if defined(NFSSERVER) || defined(NFS) 182 extern void nfs_init(void); 183 #endif 184 #ifdef NVNODE_IMPLICIT 185 int usevnodes; 186 #endif 187 188 /* 189 * Initialize the current process pointer (curproc) before 190 * any possible traps/probes to simplify trap processing. 191 */ 192 simple_lock_init(&proc0.p_raslock); 193 p = &proc0; 194 curproc = p; 195 p->p_cpu = curcpu(); 196 /* 197 * Attempt to find console and initialize 198 * in case of early panic or other messages. 199 */ 200 consinit(); 201 printf("%s", copyright); 202 203 KERNEL_LOCK_INIT(); 204 205 uvm_init(); 206 207 /* Do machine-dependent initialization. */ 208 cpu_startup(); 209 210 /* Initialize callouts. */ 211 callout_startup(); 212 213 /* 214 * Initialize mbuf's. Do this now because we might attempt to 215 * allocate mbufs or mbuf clusters during autoconfiguration. 216 */ 217 mbinit(); 218 219 /* Initialize kqueues. */ 220 kqueue_init(); 221 222 /* Initialize sockets. */ 223 soinit(); 224 225 /* 226 * The following things must be done before autoconfiguration. 227 */ 228 evcnt_init(); /* initialize event counters */ 229 disk_init(); /* initialize disk list */ 230 tty_init(); /* initialize tty list */ 231 #if NRND > 0 232 rnd_init(); /* initialize RNG */ 233 #endif 234 235 /* Initialize the sysctl subsystem. */ 236 sysctl_init(); 237 238 /* 239 * Initialize process and pgrp structures. 240 */ 241 procinit(); 242 243 #ifdef LKM 244 /* Initialize the LKM system. */ 245 lkm_init(); 246 #endif 247 248 /* 249 * Create process 0 (the swapper). 250 */ 251 s = proclist_lock_write(); 252 LIST_INSERT_HEAD(&allproc, p, p_list); 253 LIST_INSERT_HEAD(PIDHASH(p->p_pid), p, p_hash); 254 proclist_unlock_write(s); 255 256 p->p_pgrp = &pgrp0; 257 LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash); 258 LIST_INIT(&pgrp0.pg_members); 259 LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist); 260 261 pgrp0.pg_session = &session0; 262 session0.s_count = 1; 263 session0.s_sid = p->p_pid; 264 session0.s_leader = p; 265 266 /* 267 * Set P_NOCLDWAIT so that kernel threads are reparented to 268 * init(8) when they exit. init(8) can easily wait them out 269 * for us. 270 */ 271 p->p_flag = P_INMEM | P_SYSTEM | P_NOCLDWAIT; 272 p->p_stat = SONPROC; 273 p->p_nice = NZERO; 274 p->p_emul = &emul_netbsd; 275 #ifdef __HAVE_SYSCALL_INTERN 276 (*p->p_emul->e_syscall_intern)(p); 277 #endif 278 strncpy(p->p_comm, "swapper", MAXCOMLEN); 279 280 callout_init(&p->p_realit_ch); 281 callout_init(&p->p_tsleep_ch); 282 283 /* Create credentials. */ 284 cred0.p_refcnt = 1; 285 p->p_cred = &cred0; 286 p->p_ucred = crget(); 287 p->p_ucred->cr_ngroups = 1; /* group 0 */ 288 289 /* Create the file descriptor table. */ 290 finit(); 291 p->p_fd = &filedesc0.fd_fd; 292 fdinit1(&filedesc0); 293 294 /* Create the CWD info. */ 295 p->p_cwdi = &cwdi0; 296 cwdi0.cwdi_cmask = cmask; 297 cwdi0.cwdi_refcnt = 1; 298 299 /* Create the limits structures. */ 300 p->p_limit = &limit0; 301 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 302 limit0.pl_rlimit[i].rlim_cur = 303 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 304 305 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 306 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 307 maxfiles < NOFILE ? maxfiles : NOFILE; 308 309 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 310 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 311 maxproc < MAXUPRC ? maxproc : MAXUPRC; 312 313 lim = ptoa(uvmexp.free); 314 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 315 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 316 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 317 limit0.pl_corename = defcorename; 318 limit0.p_refcnt = 1; 319 320 /* 321 * Initialize proc0's vmspace, which uses the kernel pmap. 322 * All kernel processes (which never have user space mappings) 323 * share proc0's vmspace, and thus, the kernel pmap. 324 */ 325 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 326 trunc_page(VM_MAX_ADDRESS)); 327 p->p_vmspace = &vmspace0; 328 329 p->p_addr = proc0paddr; /* XXX */ 330 331 /* 332 * We continue to place resource usage info in the 333 * user struct so they're pageable. 334 */ 335 p->p_stats = &p->p_addr->u_stats; 336 337 /* 338 * Charge root for one process. 339 */ 340 (void)chgproccnt(0, 1); 341 342 rqinit(); 343 344 /* Configure virtual memory system, set vm rlimits. */ 345 uvm_init_limits(p); 346 347 /* Initialize the file systems. */ 348 #if defined(NFSSERVER) || defined(NFS) 349 nfs_init(); /* initialize server/shared data */ 350 #endif 351 #ifdef NVNODE_IMPLICIT 352 /* 353 * If maximum number of vnodes in namei vnode cache is not explicitly 354 * defined in kernel config, adjust the number such as we use roughly 355 * 0.5% of memory for vnode cache (but not less than NVNODE vnodes). 356 */ 357 usevnodes = (ptoa((unsigned)physmem) / 200) / sizeof(struct vnode); 358 if (usevnodes > desiredvnodes) 359 desiredvnodes = usevnodes; 360 #endif 361 vfsinit(); 362 363 /* Configure the system hardware. This will enable interrupts. */ 364 configure(); 365 366 ubc_init(); /* must be after autoconfig */ 367 368 /* Lock the kernel on behalf of proc0. */ 369 KERNEL_PROC_LOCK(p); 370 371 #ifdef SYSVSHM 372 /* Initialize System V style shared memory. */ 373 shminit(); 374 #endif 375 376 #ifdef SYSVSEM 377 /* Initialize System V style semaphores. */ 378 seminit(); 379 #endif 380 381 #ifdef SYSVMSG 382 /* Initialize System V style message queues. */ 383 msginit(); 384 #endif 385 386 /* Attach pseudo-devices. */ 387 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 388 (*pdev->pdev_attach)(pdev->pdev_count); 389 390 /* 391 * Initialize protocols. Block reception of incoming packets 392 * until everything is ready. 393 */ 394 s = splnet(); 395 ifinit(); 396 domaininit(); 397 if_attachdomain(); 398 splx(s); 399 400 #ifdef GPROF 401 /* Initialize kernel profiling. */ 402 kmstartup(); 403 #endif 404 405 /* Initialize system accouting. */ 406 acct_init(); 407 408 #ifdef SYSTRACE 409 systrace_init(); 410 #endif 411 /* 412 * Initialize signal-related data structures, and signal state 413 * for proc0. 414 */ 415 signal_init(); 416 p->p_sigacts = &sigacts0; 417 siginit(p); 418 419 /* Kick off timeout driven events by calling first time. */ 420 schedcpu(NULL); 421 422 /* 423 * Create process 1 (init(8)). We do this now, as Unix has 424 * historically had init be process 1, and changing this would 425 * probably upset a lot of people. 426 * 427 * Note that process 1 won't immediately exec init(8), but will 428 * wait for us to inform it that the root file system has been 429 * mounted. 430 */ 431 if (fork1(p, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 432 panic("fork init"); 433 434 /* 435 * Create any kernel threads who's creation was deferred because 436 * initproc had not yet been created. 437 */ 438 kthread_run_deferred_queue(); 439 440 /* 441 * Now that device driver threads have been created, wait for 442 * them to finish any deferred autoconfiguration. Note we don't 443 * need to lock this semaphore, since we haven't booted any 444 * secondary processors, yet. 445 */ 446 while (config_pending) 447 (void) tsleep((void *)&config_pending, PWAIT, "cfpend", 0); 448 449 /* 450 * Finalize configuration now that all real devices have been 451 * found. This needs to be done before the root device is 452 * selected, since finalization may create the root device. 453 */ 454 config_finalize(); 455 456 /* 457 * Now that autoconfiguration has completed, we can determine 458 * the root and dump devices. 459 */ 460 cpu_rootconf(); 461 cpu_dumpconf(); 462 463 /* Mount the root file system. */ 464 do { 465 domountroothook(); 466 if ((error = vfs_mountroot())) { 467 printf("cannot mount root, error = %d\n", error); 468 boothowto |= RB_ASKNAME; 469 setroot(root_device, 470 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 471 } 472 } while (error != 0); 473 mountroothook_destroy(); 474 475 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 476 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 477 478 /* 479 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 480 * reference it. 481 */ 482 if (VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode)) 483 panic("cannot find root vnode"); 484 cwdi0.cwdi_cdir = rootvnode; 485 VREF(cwdi0.cwdi_cdir); 486 VOP_UNLOCK(rootvnode, 0); 487 cwdi0.cwdi_rdir = NULL; 488 489 /* 490 * Now that root is mounted, we can fixup initproc's CWD 491 * info. All other processes are kthreads, which merely 492 * share proc0's CWD info. 493 */ 494 initproc->p_cwdi->cwdi_cdir = rootvnode; 495 VREF(initproc->p_cwdi->cwdi_cdir); 496 initproc->p_cwdi->cwdi_rdir = NULL; 497 498 /* 499 * Now can look at time, having had a chance to verify the time 500 * from the file system. Reset p->p_rtime as it may have been 501 * munched in mi_switch() after the time got set. 502 */ 503 proclist_lock_read(); 504 s = splsched(); 505 for (p = LIST_FIRST(&allproc); p != NULL; 506 p = LIST_NEXT(p, p_list)) { 507 p->p_stats->p_start = mono_time = boottime = time; 508 if (p->p_cpu != NULL) 509 p->p_cpu->ci_schedstate.spc_runtime = time; 510 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 511 } 512 splx(s); 513 proclist_unlock_read(); 514 515 /* Create the pageout daemon kernel thread. */ 516 uvm_swap_init(); 517 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 518 panic("fork pagedaemon"); 519 520 /* Create the process reaper kernel thread. */ 521 if (kthread_create1(reaper, NULL, NULL, "reaper")) 522 panic("fork reaper"); 523 524 /* Create the filesystem syncer kernel thread. */ 525 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 526 panic("fork syncer"); 527 528 /* Create the aiodone daemon kernel thread. */ 529 if (kthread_create1(uvm_aiodone_daemon, NULL, &uvm.aiodoned_proc, 530 "aiodoned")) 531 panic("fork aiodoned"); 532 533 #if defined(MULTIPROCESSOR) 534 /* Boot the secondary processors. */ 535 cpu_boot_secondary_processors(); 536 #endif 537 538 /* Initialize exec structures */ 539 exec_init(1); 540 541 #ifndef PIPE_SOCKETPAIR 542 /* Initialize pipe structures */ 543 pipe_init(); 544 #endif 545 546 /* 547 * Okay, now we can let init(8) exec! It's off to userland! 548 */ 549 start_init_exec = 1; 550 wakeup((void *)&start_init_exec); 551 552 /* The scheduler is an infinite loop. */ 553 uvm_scheduler(); 554 /* NOTREACHED */ 555 } 556 557 static void 558 check_console(struct proc *p) 559 { 560 struct nameidata nd; 561 int error; 562 563 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 564 error = namei(&nd); 565 if (error == 0) 566 vrele(nd.ni_vp); 567 else if (error == ENOENT) 568 printf("warning: no /dev/console\n"); 569 else 570 printf("warning: lookup /dev/console: error %d\n", error); 571 } 572 573 /* 574 * List of paths to try when searching for "init". 575 */ 576 static const char *initpaths[] = { 577 "/sbin/init", 578 "/sbin/oinit", 579 "/sbin/init.bak", 580 NULL, 581 }; 582 583 /* 584 * Start the initial user process; try exec'ing each pathname in "initpaths". 585 * The program is invoked with one argument containing the boot flags. 586 */ 587 static void 588 start_init(void *arg) 589 { 590 struct proc *p = arg; 591 vaddr_t addr; 592 struct sys_execve_args /* { 593 syscallarg(const char *) path; 594 syscallarg(char * const *) argp; 595 syscallarg(char * const *) envp; 596 } */ args; 597 int options, i, error; 598 register_t retval[2]; 599 char flags[4], *flagsp; 600 const char *path, *slash; 601 char *ucp, **uap, *arg0, *arg1 = NULL; 602 char ipath[129]; 603 int ipx, len; 604 605 /* 606 * Now in process 1. 607 */ 608 strncpy(p->p_comm, "init", MAXCOMLEN); 609 610 /* 611 * Wait for main() to tell us that it's safe to exec. 612 */ 613 while (start_init_exec == 0) 614 (void) tsleep((void *)&start_init_exec, PWAIT, "initexec", 0); 615 616 /* 617 * This is not the right way to do this. We really should 618 * hand-craft a descriptor onto /dev/console to hand to init, 619 * but that's a _lot_ more work, and the benefit from this easy 620 * hack makes up for the "good is the enemy of the best" effect. 621 */ 622 check_console(p); 623 624 /* 625 * Need just enough stack to hold the faked-up "execve()" arguments. 626 */ 627 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 628 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 629 NULL, UVM_UNKNOWN_OFFSET, 0, 630 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 631 UVM_ADV_NORMAL, 632 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 633 panic("init: couldn't allocate argument space"); 634 p->p_vmspace->vm_maxsaddr = (caddr_t)STACK_MAX(addr, PAGE_SIZE); 635 636 ipx = 0; 637 while (1) { 638 if (boothowto & RB_ASKNAME) { 639 printf("init path"); 640 if (initpaths[ipx]) 641 printf(" (default %s)", initpaths[ipx]); 642 printf(": "); 643 len = cngetsn(ipath, sizeof(ipath)-1); 644 if (len == 0) { 645 if (initpaths[ipx]) 646 path = initpaths[ipx++]; 647 else 648 continue; 649 } else { 650 ipath[len] = '\0'; 651 path = ipath; 652 } 653 } else { 654 if ((path = initpaths[ipx++]) == NULL) 655 break; 656 } 657 658 ucp = (char *)USRSTACK; 659 660 /* 661 * Construct the boot flag argument. 662 */ 663 flagsp = flags; 664 *flagsp++ = '-'; 665 options = 0; 666 667 if (boothowto & RB_SINGLE) { 668 *flagsp++ = 's'; 669 options = 1; 670 } 671 #ifdef notyet 672 if (boothowto & RB_FASTBOOT) { 673 *flagsp++ = 'f'; 674 options = 1; 675 } 676 #endif 677 678 /* 679 * Move out the flags (arg 1), if necessary. 680 */ 681 if (options != 0) { 682 *flagsp++ = '\0'; 683 i = flagsp - flags; 684 #ifdef DEBUG 685 printf("init: copying out flags `%s' %d\n", flags, i); 686 #endif 687 arg1 = STACK_ALLOC(ucp, i); 688 ucp = STACK_MAX(arg1, i); 689 (void)copyout((caddr_t)flags, arg1, i); 690 } 691 692 /* 693 * Move out the file name (also arg 0). 694 */ 695 i = strlen(path) + 1; 696 #ifdef DEBUG 697 printf("init: copying out path `%s' %d\n", path, i); 698 #else 699 if (boothowto & RB_ASKNAME || path != initpaths[0]) 700 printf("init: trying %s\n", path); 701 #endif 702 arg0 = STACK_ALLOC(ucp, i); 703 ucp = STACK_MAX(arg0, i); 704 (void)copyout((caddr_t)path, arg0, i); 705 706 /* 707 * Move out the arg pointers. 708 */ 709 ucp = (caddr_t)STACK_ALIGN(ucp, ALIGNBYTES); 710 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 711 SCARG(&args, path) = arg0; 712 SCARG(&args, argp) = uap; 713 SCARG(&args, envp) = NULL; 714 slash = strrchr(path, '/'); 715 if (slash) 716 (void)suword((caddr_t)uap++, 717 (long)arg0 + (slash + 1 - path)); 718 else 719 (void)suword((caddr_t)uap++, (long)arg0); 720 if (options != 0) 721 (void)suword((caddr_t)uap++, (long)arg1); 722 (void)suword((caddr_t)uap++, 0); /* terminator */ 723 724 /* 725 * Now try to exec the program. If can't for any reason 726 * other than it doesn't exist, complain. 727 */ 728 error = sys_execve(p, &args, retval); 729 if (error == 0 || error == EJUSTRETURN) { 730 KERNEL_PROC_UNLOCK(p); 731 return; 732 } 733 printf("exec %s: error %d\n", path, error); 734 } 735 printf("init: not found\n"); 736 panic("no init"); 737 } 738