init.c revision 50476
1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Donn Seeley at Berkeley Software Design, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. 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 37#ifndef lint 38static const char copyright[] = 39"@(#) Copyright (c) 1991, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /* not lint */ 42 43#ifndef lint 44#if 0 45static char sccsid[] = "@(#)init.c 8.1 (Berkeley) 7/15/93"; 46#endif 47static const char rcsid[] = 48 "$FreeBSD: head/sbin/init/init.c 50476 1999-08-28 00:22:10Z peter $"; 49#endif /* not lint */ 50 51#include <sys/param.h> 52#include <sys/ioctl.h> 53#include <sys/mount.h> 54#include <sys/sysctl.h> 55#include <sys/wait.h> 56#include <sys/types.h> 57#include <sys/stat.h> 58 59#include <db.h> 60#include <errno.h> 61#include <fcntl.h> 62#include <libutil.h> 63#include <signal.h> 64#include <stdio.h> 65#include <stdlib.h> 66#include <string.h> 67#include <syslog.h> 68#include <time.h> 69#include <ttyent.h> 70#include <unistd.h> 71#include <sys/reboot.h> 72#include <err.h> 73 74#ifdef __STDC__ 75#include <stdarg.h> 76#else 77#include <varargs.h> 78#endif 79 80#ifdef SECURE 81#include <pwd.h> 82#endif 83 84#ifdef LOGIN_CAP 85#include <login_cap.h> 86#endif 87 88#include "pathnames.h" 89 90/* 91 * Sleep times; used to prevent thrashing. 92 */ 93#define GETTY_SPACING 5 /* N secs minimum getty spacing */ 94#define GETTY_SLEEP 30 /* sleep N secs after spacing problem */ 95#define GETTY_NSPACE 3 /* max. spacing count to bring reaction */ 96#define WINDOW_WAIT 3 /* wait N secs after starting window */ 97#define STALL_TIMEOUT 30 /* wait N secs after warning */ 98#define DEATH_WATCH 10 /* wait N secs for procs to die */ 99#define DEATH_SCRIPT 120 /* wait for 2min for /etc/rc.shutdown */ 100#define RESOURCE_RC "daemon" 101#define RESOURCE_WINDOW "default" 102#define RESOURCE_GETTY "default" 103 104void handle __P((sig_t, ...)); 105void delset __P((sigset_t *, ...)); 106 107void stall __P((char *, ...)); 108void warning __P((char *, ...)); 109void emergency __P((char *, ...)); 110void disaster __P((int)); 111void badsys __P((int)); 112int runshutdown __P((void)); 113 114/* 115 * We really need a recursive typedef... 116 * The following at least guarantees that the return type of (*state_t)() 117 * is sufficiently wide to hold a function pointer. 118 */ 119typedef long (*state_func_t) __P((void)); 120typedef state_func_t (*state_t) __P((void)); 121 122state_func_t single_user __P((void)); 123state_func_t runcom __P((void)); 124state_func_t read_ttys __P((void)); 125state_func_t multi_user __P((void)); 126state_func_t clean_ttys __P((void)); 127state_func_t catatonia __P((void)); 128state_func_t death __P((void)); 129 130enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 131#define FALSE 0 132#define TRUE 1 133 134int Reboot = FALSE; 135int howto = RB_AUTOBOOT; 136 137int devfs; 138 139void transition __P((state_t)); 140state_t requested_transition = runcom; 141 142void setctty __P((char *)); 143 144typedef struct init_session { 145 int se_index; /* index of entry in ttys file */ 146 pid_t se_process; /* controlling process */ 147 time_t se_started; /* used to avoid thrashing */ 148 int se_flags; /* status of session */ 149#define SE_SHUTDOWN 0x1 /* session won't be restarted */ 150 int se_nspace; /* spacing count */ 151 char *se_device; /* filename of port */ 152 char *se_getty; /* what to run on that port */ 153 char *se_getty_argv_space; /* pre-parsed argument array space */ 154 char **se_getty_argv; /* pre-parsed argument array */ 155 char *se_window; /* window system (started only once) */ 156 char *se_window_argv_space; /* pre-parsed argument array space */ 157 char **se_window_argv; /* pre-parsed argument array */ 158 char *se_type; /* default terminal type */ 159 struct init_session *se_prev; 160 struct init_session *se_next; 161} session_t; 162 163void free_session __P((session_t *)); 164session_t *new_session __P((session_t *, int, struct ttyent *)); 165session_t *sessions; 166 167char **construct_argv __P((char *)); 168void start_window_system __P((session_t *)); 169void collect_child __P((pid_t)); 170pid_t start_getty __P((session_t *)); 171void transition_handler __P((int)); 172void alrm_handler __P((int)); 173void setsecuritylevel __P((int)); 174int getsecuritylevel __P((void)); 175int setupargv __P((session_t *, struct ttyent *)); 176#ifdef LOGIN_CAP 177void setprocresources __P((const char *)); 178#endif 179int clang; 180 181void clear_session_logs __P((session_t *)); 182 183int start_session_db __P((void)); 184void add_session __P((session_t *)); 185void del_session __P((session_t *)); 186session_t *find_session __P((pid_t)); 187DB *session_db; 188 189/* 190 * The mother of all processes. 191 */ 192int 193main(argc, argv) 194 int argc; 195 char **argv; 196{ 197 int c; 198 struct sigaction sa; 199 sigset_t mask; 200 201 202 /* Dispose of random users. */ 203 if (getuid() != 0) 204 errx(1, "%s", strerror(EPERM)); 205 206 /* System V users like to reexec init. */ 207 if (getpid() != 1) { 208#ifdef COMPAT_SYSV_INIT 209 /* So give them what they want */ 210 if (argc > 1) { 211 if (strlen(argv[1]) == 1) { 212 register char runlevel = *argv[1]; 213 register int sig; 214 215 switch (runlevel) { 216 case '0': /* halt + poweroff */ 217 sig = SIGUSR2; 218 break; 219 case '1': /* single-user */ 220 sig = SIGTERM; 221 break; 222 case '6': /* reboot */ 223 sig = SIGINT; 224 break; 225 case 'c': /* block further logins */ 226 sig = SIGTSTP; 227 break; 228 case 'q': /* rescan /etc/ttys */ 229 sig = SIGHUP; 230 break; 231 default: 232 goto invalid; 233 } 234 kill(1, sig); 235 _exit(0); 236 } else 237invalid: 238 errx(1, "invalid run-level ``%s''", argv[1]); 239 } else 240#endif 241 errx(1, "already running"); 242 } 243 /* 244 * Note that this does NOT open a file... 245 * Does 'init' deserve its own facility number? 246 */ 247 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH); 248 249 /* 250 * Create an initial session. 251 */ 252 if (setsid() < 0) 253 warning("initial setsid() failed: %m"); 254 255 /* 256 * Establish an initial user so that programs running 257 * single user do not freak out and die (like passwd). 258 */ 259 if (setlogin("root") < 0) 260 warning("setlogin() failed: %m"); 261 262 /* 263 * This code assumes that we always get arguments through flags, 264 * never through bits set in some random machine register. 265 */ 266 while ((c = getopt(argc, argv, "dsf")) != -1) 267 switch (c) { 268 case 'd': 269 devfs = 1; 270 break; 271 case 's': 272 requested_transition = single_user; 273 break; 274 case 'f': 275 runcom_mode = FASTBOOT; 276 break; 277 default: 278 warning("unrecognized flag '-%c'", c); 279 break; 280 } 281 282 if (optind != argc) 283 warning("ignoring excess arguments"); 284 285 if (devfs) { 286 mount("devfs", "/dev", MNT_NOEXEC|MNT_RDONLY, 0); 287 } 288 289 /* 290 * We catch or block signals rather than ignore them, 291 * so that they get reset on exec. 292 */ 293 handle(badsys, SIGSYS, 0); 294 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, 295 SIGBUS, SIGXCPU, SIGXFSZ, 0); 296 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP, 297 SIGUSR1, SIGUSR2, 0); 298 handle(alrm_handler, SIGALRM, 0); 299 sigfillset(&mask); 300 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS, 301 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM, 302 SIGUSR1, SIGUSR2, 0); 303 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 304 sigemptyset(&sa.sa_mask); 305 sa.sa_flags = 0; 306 sa.sa_handler = SIG_IGN; 307 (void) sigaction(SIGTTIN, &sa, (struct sigaction *)0); 308 (void) sigaction(SIGTTOU, &sa, (struct sigaction *)0); 309 310 /* 311 * Paranoia. 312 */ 313 close(0); 314 close(1); 315 close(2); 316 317 /* 318 * Start the state machine. 319 */ 320 transition(requested_transition); 321 322 /* 323 * Should never reach here. 324 */ 325 return 1; 326} 327 328/* 329 * Associate a function with a signal handler. 330 */ 331void 332#ifdef __STDC__ 333handle(sig_t handler, ...) 334#else 335handle(va_alist) 336 va_dcl 337#endif 338{ 339 int sig; 340 struct sigaction sa; 341 sigset_t mask_everything; 342 va_list ap; 343#ifndef __STDC__ 344 sig_t handler; 345 346 va_start(ap); 347 handler = va_arg(ap, sig_t); 348#else 349 va_start(ap, handler); 350#endif 351 352 sa.sa_handler = handler; 353 sigfillset(&mask_everything); 354 355 while ((sig = va_arg(ap, int)) != NULL) { 356 sa.sa_mask = mask_everything; 357 /* XXX SA_RESTART? */ 358 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0; 359 sigaction(sig, &sa, (struct sigaction *) 0); 360 } 361 va_end(ap); 362} 363 364/* 365 * Delete a set of signals from a mask. 366 */ 367void 368#ifdef __STDC__ 369delset(sigset_t *maskp, ...) 370#else 371delset(va_alist) 372 va_dcl 373#endif 374{ 375 int sig; 376 va_list ap; 377#ifndef __STDC__ 378 sigset_t *maskp; 379 380 va_start(ap); 381 maskp = va_arg(ap, sigset_t *); 382#else 383 va_start(ap, maskp); 384#endif 385 386 while ((sig = va_arg(ap, int)) != NULL) 387 sigdelset(maskp, sig); 388 va_end(ap); 389} 390 391/* 392 * Log a message and sleep for a while (to give someone an opportunity 393 * to read it and to save log or hardcopy output if the problem is chronic). 394 * NB: should send a message to the session logger to avoid blocking. 395 */ 396void 397#ifdef __STDC__ 398stall(char *message, ...) 399#else 400stall(va_alist) 401 va_dcl 402#endif 403{ 404 va_list ap; 405#ifndef __STDC__ 406 char *message; 407 408 va_start(ap); 409 message = va_arg(ap, char *); 410#else 411 va_start(ap, message); 412#endif 413 414 vsyslog(LOG_ALERT, message, ap); 415 va_end(ap); 416 sleep(STALL_TIMEOUT); 417} 418 419/* 420 * Like stall(), but doesn't sleep. 421 * If cpp had variadic macros, the two functions could be #defines for another. 422 * NB: should send a message to the session logger to avoid blocking. 423 */ 424void 425#ifdef __STDC__ 426warning(char *message, ...) 427#else 428warning(va_alist) 429 va_dcl 430#endif 431{ 432 va_list ap; 433#ifndef __STDC__ 434 char *message; 435 436 va_start(ap); 437 message = va_arg(ap, char *); 438#else 439 va_start(ap, message); 440#endif 441 442 vsyslog(LOG_ALERT, message, ap); 443 va_end(ap); 444} 445 446/* 447 * Log an emergency message. 448 * NB: should send a message to the session logger to avoid blocking. 449 */ 450void 451#ifdef __STDC__ 452emergency(char *message, ...) 453#else 454emergency(va_alist) 455 va_dcl 456#endif 457{ 458 va_list ap; 459#ifndef __STDC__ 460 char *message; 461 462 va_start(ap); 463 message = va_arg(ap, char *); 464#else 465 va_start(ap, message); 466#endif 467 468 vsyslog(LOG_EMERG, message, ap); 469 va_end(ap); 470} 471 472/* 473 * Catch a SIGSYS signal. 474 * 475 * These may arise if a system does not support sysctl. 476 * We tolerate up to 25 of these, then throw in the towel. 477 */ 478void 479badsys(sig) 480 int sig; 481{ 482 static int badcount = 0; 483 484 if (badcount++ < 25) 485 return; 486 disaster(sig); 487} 488 489/* 490 * Catch an unexpected signal. 491 */ 492void 493disaster(sig) 494 int sig; 495{ 496 emergency("fatal signal: %s", 497 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal"); 498 499 sleep(STALL_TIMEOUT); 500 _exit(sig); /* reboot */ 501} 502 503/* 504 * Get the security level of the kernel. 505 */ 506int 507getsecuritylevel() 508{ 509#ifdef KERN_SECURELVL 510 int name[2], curlevel; 511 size_t len; 512 extern int errno; 513 514 name[0] = CTL_KERN; 515 name[1] = KERN_SECURELVL; 516 len = sizeof curlevel; 517 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 518 emergency("cannot get kernel security level: %s", 519 strerror(errno)); 520 return (-1); 521 } 522 return (curlevel); 523#else 524 return (-1); 525#endif 526} 527 528/* 529 * Set the security level of the kernel. 530 */ 531void 532setsecuritylevel(newlevel) 533 int newlevel; 534{ 535#ifdef KERN_SECURELVL 536 int name[2], curlevel; 537 extern int errno; 538 539 curlevel = getsecuritylevel(); 540 if (newlevel == curlevel) 541 return; 542 name[0] = CTL_KERN; 543 name[1] = KERN_SECURELVL; 544 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) { 545 emergency( 546 "cannot change kernel security level from %d to %d: %s", 547 curlevel, newlevel, strerror(errno)); 548 return; 549 } 550#ifdef SECURE 551 warning("kernel security level changed from %d to %d", 552 curlevel, newlevel); 553#endif 554#endif 555} 556 557/* 558 * Change states in the finite state machine. 559 * The initial state is passed as an argument. 560 */ 561void 562transition(s) 563 state_t s; 564{ 565 for (;;) 566 s = (state_t) (*s)(); 567} 568 569/* 570 * Close out the accounting files for a login session. 571 * NB: should send a message to the session logger to avoid blocking. 572 */ 573void 574clear_session_logs(sp) 575 session_t *sp; 576{ 577 char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 578 579 if (logout(line)) 580 logwtmp(line, "", ""); 581} 582 583/* 584 * Start a session and allocate a controlling terminal. 585 * Only called by children of init after forking. 586 */ 587void 588setctty(name) 589 char *name; 590{ 591 int fd; 592 593 (void) revoke(name); 594 if ((fd = open(name, O_RDWR)) == -1) { 595 stall("can't open %s: %m", name); 596 _exit(1); 597 } 598 if (login_tty(fd) == -1) { 599 stall("can't get %s for controlling terminal: %m", name); 600 _exit(1); 601 } 602} 603 604/* 605 * Bring the system up single user. 606 */ 607state_func_t 608single_user() 609{ 610 pid_t pid, wpid; 611 int status; 612 sigset_t mask; 613 char *shell = _PATH_BSHELL; 614 char *argv[2]; 615#ifdef SECURE 616 struct ttyent *typ; 617 struct passwd *pp; 618 static const char banner[] = 619 "Enter root password, or ^D to go multi-user\n"; 620 char *clear, *password; 621#endif 622#ifdef DEBUGSHELL 623 char altshell[128]; 624#endif 625 626 /* 627 * If the kernel is in secure mode, downgrade it to insecure mode. 628 */ 629 if (getsecuritylevel() > 0) 630 setsecuritylevel(0); 631 632 if (Reboot) { 633 /* Instead of going single user, let's reboot the machine */ 634 sync(); 635 alarm(2); 636 pause(); 637 reboot(howto); 638 _exit(0); 639 } 640 641 if ((pid = fork()) == 0) { 642 /* 643 * Start the single user session. 644 */ 645 setctty(_PATH_CONSOLE); 646 647#ifdef SECURE 648 /* 649 * Check the root password. 650 * We don't care if the console is 'on' by default; 651 * it's the only tty that can be 'off' and 'secure'. 652 */ 653 typ = getttynam("console"); 654 pp = getpwnam("root"); 655 if (typ && (typ->ty_status & TTY_SECURE) == 0 && pp && *pp->pw_passwd) { 656 write(2, banner, sizeof banner - 1); 657 for (;;) { 658 clear = getpass("Password:"); 659 if (clear == 0 || *clear == '\0') 660 _exit(0); 661 password = crypt(clear, pp->pw_passwd); 662 bzero(clear, _PASSWORD_LEN); 663 if (strcmp(password, pp->pw_passwd) == 0) 664 break; 665 warning("single-user login failed\n"); 666 } 667 } 668 endttyent(); 669 endpwent(); 670#endif /* SECURE */ 671 672#ifdef DEBUGSHELL 673 { 674 char *cp = altshell; 675 int num; 676 677#define SHREQUEST \ 678 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": " 679 (void)write(STDERR_FILENO, 680 SHREQUEST, sizeof(SHREQUEST) - 1); 681 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 682 num != 0 && *cp != '\n' && cp < &altshell[127]) 683 cp++; 684 *cp = '\0'; 685 if (altshell[0] != '\0') 686 shell = altshell; 687 } 688#endif /* DEBUGSHELL */ 689 690 /* 691 * Unblock signals. 692 * We catch all the interesting ones, 693 * and those are reset to SIG_DFL on exec. 694 */ 695 sigemptyset(&mask); 696 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 697 698 /* 699 * Fire off a shell. 700 * If the default one doesn't work, try the Bourne shell. 701 */ 702 argv[0] = "-sh"; 703 argv[1] = 0; 704 execv(shell, argv); 705 emergency("can't exec %s for single user: %m", shell); 706 execv(_PATH_BSHELL, argv); 707 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 708 sleep(STALL_TIMEOUT); 709 _exit(1); 710 } 711 712 if (pid == -1) { 713 /* 714 * We are seriously hosed. Do our best. 715 */ 716 emergency("can't fork single-user shell, trying again"); 717 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 718 continue; 719 return (state_func_t) single_user; 720 } 721 722 requested_transition = 0; 723 do { 724 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 725 collect_child(wpid); 726 if (wpid == -1) { 727 if (errno == EINTR) 728 continue; 729 warning("wait for single-user shell failed: %m; restarting"); 730 return (state_func_t) single_user; 731 } 732 if (wpid == pid && WIFSTOPPED(status)) { 733 warning("init: shell stopped, restarting\n"); 734 kill(pid, SIGCONT); 735 wpid = -1; 736 } 737 } while (wpid != pid && !requested_transition); 738 739 if (requested_transition) 740 return (state_func_t) requested_transition; 741 742 if (!WIFEXITED(status)) { 743 if (WTERMSIG(status) == SIGKILL) { 744 /* 745 * reboot(8) killed shell? 746 */ 747 warning("single user shell terminated."); 748 sleep(STALL_TIMEOUT); 749 _exit(0); 750 } else { 751 warning("single user shell terminated, restarting"); 752 return (state_func_t) single_user; 753 } 754 } 755 756 runcom_mode = FASTBOOT; 757 return (state_func_t) runcom; 758} 759 760/* 761 * Run the system startup script. 762 */ 763state_func_t 764runcom() 765{ 766 pid_t pid, wpid; 767 int status; 768 char *argv[4]; 769 struct sigaction sa; 770 771 if ((pid = fork()) == 0) { 772 sigemptyset(&sa.sa_mask); 773 sa.sa_flags = 0; 774 sa.sa_handler = SIG_IGN; 775 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0); 776 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0); 777 778 setctty(_PATH_CONSOLE); 779 780 argv[0] = "sh"; 781 argv[1] = _PATH_RUNCOM; 782 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0; 783 argv[3] = 0; 784 785 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 786 787#ifdef LOGIN_CAP 788 setprocresources(RESOURCE_RC); 789#endif 790 execv(_PATH_BSHELL, argv); 791 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM); 792 _exit(1); /* force single user mode */ 793 } 794 795 if (pid == -1) { 796 emergency("can't fork for %s on %s: %m", 797 _PATH_BSHELL, _PATH_RUNCOM); 798 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 799 continue; 800 sleep(STALL_TIMEOUT); 801 return (state_func_t) single_user; 802 } 803 804 /* 805 * Copied from single_user(). This is a bit paranoid. 806 */ 807 do { 808 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 809 collect_child(wpid); 810 if (wpid == -1) { 811 if (errno == EINTR) 812 continue; 813 warning("wait for %s on %s failed: %m; going to single user mode", 814 _PATH_BSHELL, _PATH_RUNCOM); 815 return (state_func_t) single_user; 816 } 817 if (wpid == pid && WIFSTOPPED(status)) { 818 warning("init: %s on %s stopped, restarting\n", 819 _PATH_BSHELL, _PATH_RUNCOM); 820 kill(pid, SIGCONT); 821 wpid = -1; 822 } 823 } while (wpid != pid); 824 825 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 826 requested_transition == catatonia) { 827 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 828 sigset_t s; 829 830 sigfillset(&s); 831 for (;;) 832 sigsuspend(&s); 833 } 834 835 if (!WIFEXITED(status)) { 836 warning("%s on %s terminated abnormally, going to single user mode", 837 _PATH_BSHELL, _PATH_RUNCOM); 838 return (state_func_t) single_user; 839 } 840 841 if (WEXITSTATUS(status)) 842 return (state_func_t) single_user; 843 844 runcom_mode = AUTOBOOT; /* the default */ 845 /* NB: should send a message to the session logger to avoid blocking. */ 846 logwtmp("~", "reboot", ""); 847 return (state_func_t) read_ttys; 848} 849 850/* 851 * Open the session database. 852 * 853 * NB: We could pass in the size here; is it necessary? 854 */ 855int 856start_session_db() 857{ 858 if (session_db && (*session_db->close)(session_db)) 859 emergency("session database close: %s", strerror(errno)); 860 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 861 emergency("session database open: %s", strerror(errno)); 862 return (1); 863 } 864 return (0); 865 866} 867 868/* 869 * Add a new login session. 870 */ 871void 872add_session(sp) 873 session_t *sp; 874{ 875 DBT key; 876 DBT data; 877 878 key.data = &sp->se_process; 879 key.size = sizeof sp->se_process; 880 data.data = &sp; 881 data.size = sizeof sp; 882 883 if ((*session_db->put)(session_db, &key, &data, 0)) 884 emergency("insert %d: %s", sp->se_process, strerror(errno)); 885} 886 887/* 888 * Delete an old login session. 889 */ 890void 891del_session(sp) 892 session_t *sp; 893{ 894 DBT key; 895 896 key.data = &sp->se_process; 897 key.size = sizeof sp->se_process; 898 899 if ((*session_db->del)(session_db, &key, 0)) 900 emergency("delete %d: %s", sp->se_process, strerror(errno)); 901} 902 903/* 904 * Look up a login session by pid. 905 */ 906session_t * 907#ifdef __STDC__ 908find_session(pid_t pid) 909#else 910find_session(pid) 911 pid_t pid; 912#endif 913{ 914 DBT key; 915 DBT data; 916 session_t *ret; 917 918 key.data = &pid; 919 key.size = sizeof pid; 920 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 921 return 0; 922 bcopy(data.data, (char *)&ret, sizeof(ret)); 923 return ret; 924} 925 926/* 927 * Construct an argument vector from a command line. 928 */ 929char ** 930construct_argv(command) 931 char *command; 932{ 933 char *strk (char *); 934 register int argc = 0; 935 register char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1) 936 * sizeof (char *)); 937 938 if ((argv[argc++] = strk(command)) == 0) { 939 free(argv); 940 return (NULL); 941 } 942 while ((argv[argc++] = strk((char *) 0)) != NULL) 943 continue; 944 return argv; 945} 946 947/* 948 * Deallocate a session descriptor. 949 */ 950void 951free_session(sp) 952 register session_t *sp; 953{ 954 free(sp->se_device); 955 if (sp->se_getty) { 956 free(sp->se_getty); 957 free(sp->se_getty_argv_space); 958 free(sp->se_getty_argv); 959 } 960 if (sp->se_window) { 961 free(sp->se_window); 962 free(sp->se_window_argv_space); 963 free(sp->se_window_argv); 964 } 965 if (sp->se_type) 966 free(sp->se_type); 967 free(sp); 968} 969 970/* 971 * Allocate a new session descriptor. 972 */ 973session_t * 974new_session(sprev, session_index, typ) 975 session_t *sprev; 976 int session_index; 977 register struct ttyent *typ; 978{ 979 register session_t *sp; 980 int fd; 981 982 if ((typ->ty_status & TTY_ON) == 0 || 983 typ->ty_name == 0 || 984 typ->ty_getty == 0) 985 return 0; 986 987 sp = (session_t *) calloc(1, sizeof (session_t)); 988 989 sp->se_index = session_index; 990 991 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 992 (void) sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 993 994 /* 995 * Attempt to open the device, if we get "device not configured" 996 * then don't add the device to the session list. 997 */ 998 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 999 if (errno == ENXIO) { 1000 free_session(sp); 1001 return (0); 1002 } 1003 } else 1004 close(fd); 1005 1006 if (setupargv(sp, typ) == 0) { 1007 free_session(sp); 1008 return (0); 1009 } 1010 1011 sp->se_next = 0; 1012 if (sprev == 0) { 1013 sessions = sp; 1014 sp->se_prev = 0; 1015 } else { 1016 sprev->se_next = sp; 1017 sp->se_prev = sprev; 1018 } 1019 1020 return sp; 1021} 1022 1023/* 1024 * Calculate getty and if useful window argv vectors. 1025 */ 1026int 1027setupargv(sp, typ) 1028 session_t *sp; 1029 struct ttyent *typ; 1030{ 1031 1032 if (sp->se_getty) { 1033 free(sp->se_getty); 1034 free(sp->se_getty_argv_space); 1035 free(sp->se_getty_argv); 1036 } 1037 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1038 (void) sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1039 sp->se_getty_argv_space = strdup(sp->se_getty); 1040 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1041 if (sp->se_getty_argv == 0) { 1042 warning("can't parse getty for port %s", sp->se_device); 1043 free(sp->se_getty); 1044 free(sp->se_getty_argv_space); 1045 sp->se_getty = sp->se_getty_argv_space = 0; 1046 return (0); 1047 } 1048 if (sp->se_window) { 1049 free(sp->se_window); 1050 free(sp->se_window_argv_space); 1051 free(sp->se_window_argv); 1052 } 1053 sp->se_window = sp->se_window_argv_space = 0; 1054 sp->se_window_argv = 0; 1055 if (typ->ty_window) { 1056 sp->se_window = strdup(typ->ty_window); 1057 sp->se_window_argv_space = strdup(sp->se_window); 1058 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1059 if (sp->se_window_argv == 0) { 1060 warning("can't parse window for port %s", 1061 sp->se_device); 1062 free(sp->se_window_argv_space); 1063 free(sp->se_window); 1064 sp->se_window = sp->se_window_argv_space = 0; 1065 return (0); 1066 } 1067 } 1068 if (sp->se_type) 1069 free(sp->se_type); 1070 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1071 return (1); 1072} 1073 1074/* 1075 * Walk the list of ttys and create sessions for each active line. 1076 */ 1077state_func_t 1078read_ttys() 1079{ 1080 int session_index = 0; 1081 register session_t *sp, *snext; 1082 register struct ttyent *typ; 1083 1084 /* 1085 * Destroy any previous session state. 1086 * There shouldn't be any, but just in case... 1087 */ 1088 for (sp = sessions; sp; sp = snext) { 1089 if (sp->se_process) 1090 clear_session_logs(sp); 1091 snext = sp->se_next; 1092 free_session(sp); 1093 } 1094 sessions = 0; 1095 if (start_session_db()) 1096 return (state_func_t) single_user; 1097 1098 /* 1099 * Allocate a session entry for each active port. 1100 * Note that sp starts at 0. 1101 */ 1102 while ((typ = getttyent()) != NULL) 1103 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1104 sp = snext; 1105 1106 endttyent(); 1107 1108 return (state_func_t) multi_user; 1109} 1110 1111/* 1112 * Start a window system running. 1113 */ 1114void 1115start_window_system(sp) 1116 session_t *sp; 1117{ 1118 pid_t pid; 1119 sigset_t mask; 1120 char term[64], *env[2]; 1121 1122 if ((pid = fork()) == -1) { 1123 emergency("can't fork for window system on port %s: %m", 1124 sp->se_device); 1125 /* hope that getty fails and we can try again */ 1126 return; 1127 } 1128 1129 if (pid) 1130 return; 1131 1132 sigemptyset(&mask); 1133 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1134 1135 if (setsid() < 0) 1136 emergency("setsid failed (window) %m"); 1137 1138#ifdef LOGIN_CAP 1139 setprocresources(RESOURCE_WINDOW); 1140#endif 1141 if (sp->se_type) { 1142 /* Don't use malloc after fork */ 1143 strcpy(term, "TERM="); 1144 strncat(term, sp->se_type, sizeof(term) - 6); 1145 env[0] = term; 1146 env[1] = 0; 1147 } 1148 else 1149 env[0] = 0; 1150 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1151 stall("can't exec window system '%s' for port %s: %m", 1152 sp->se_window_argv[0], sp->se_device); 1153 _exit(1); 1154} 1155 1156/* 1157 * Start a login session running. 1158 */ 1159pid_t 1160start_getty(sp) 1161 session_t *sp; 1162{ 1163 pid_t pid; 1164 sigset_t mask; 1165 time_t current_time = time((time_t *) 0); 1166 int too_quick = 0; 1167 char term[64], *env[2]; 1168 1169 if (current_time >= sp->se_started && 1170 current_time - sp->se_started < GETTY_SPACING) { 1171 if (++sp->se_nspace > GETTY_NSPACE) { 1172 sp->se_nspace = 0; 1173 too_quick = 1; 1174 } 1175 } else 1176 sp->se_nspace = 0; 1177 1178 /* 1179 * fork(), not vfork() -- we can't afford to block. 1180 */ 1181 if ((pid = fork()) == -1) { 1182 emergency("can't fork for getty on port %s: %m", sp->se_device); 1183 return -1; 1184 } 1185 1186 if (pid) 1187 return pid; 1188 1189 if (too_quick) { 1190 warning("getty repeating too quickly on port %s, sleeping %d secs", 1191 sp->se_device, GETTY_SLEEP); 1192 sleep((unsigned) GETTY_SLEEP); 1193 } 1194 1195 if (sp->se_window) { 1196 start_window_system(sp); 1197 sleep(WINDOW_WAIT); 1198 } 1199 1200 sigemptyset(&mask); 1201 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1202 1203#ifdef LOGIN_CAP 1204 setprocresources(RESOURCE_GETTY); 1205#endif 1206 if (sp->se_type) { 1207 /* Don't use malloc after fork */ 1208 strcpy(term, "TERM="); 1209 strncat(term, sp->se_type, sizeof(term) - 6); 1210 env[0] = term; 1211 env[1] = 0; 1212 } 1213 else 1214 env[0] = 0; 1215 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1216 stall("can't exec getty '%s' for port %s: %m", 1217 sp->se_getty_argv[0], sp->se_device); 1218 _exit(1); 1219} 1220 1221/* 1222 * Collect exit status for a child. 1223 * If an exiting login, start a new login running. 1224 */ 1225void 1226#ifdef __STDC__ 1227collect_child(pid_t pid) 1228#else 1229collect_child(pid) 1230 pid_t pid; 1231#endif 1232{ 1233 register session_t *sp, *sprev, *snext; 1234 1235 if (! sessions) 1236 return; 1237 1238 if (! (sp = find_session(pid))) 1239 return; 1240 1241 clear_session_logs(sp); 1242 del_session(sp); 1243 sp->se_process = 0; 1244 1245 if (sp->se_flags & SE_SHUTDOWN) { 1246 if ((sprev = sp->se_prev) != NULL) 1247 sprev->se_next = sp->se_next; 1248 else 1249 sessions = sp->se_next; 1250 if ((snext = sp->se_next) != NULL) 1251 snext->se_prev = sp->se_prev; 1252 free_session(sp); 1253 return; 1254 } 1255 1256 if ((pid = start_getty(sp)) == -1) { 1257 /* serious trouble */ 1258 requested_transition = clean_ttys; 1259 return; 1260 } 1261 1262 sp->se_process = pid; 1263 sp->se_started = time((time_t *) 0); 1264 add_session(sp); 1265} 1266 1267/* 1268 * Catch a signal and request a state transition. 1269 */ 1270void 1271transition_handler(sig) 1272 int sig; 1273{ 1274 1275 switch (sig) { 1276 case SIGHUP: 1277 requested_transition = clean_ttys; 1278 break; 1279 case SIGUSR2: 1280 howto = RB_POWEROFF; 1281 case SIGUSR1: 1282 howto |= RB_HALT; 1283 case SIGINT: 1284 Reboot = TRUE; 1285 case SIGTERM: 1286 requested_transition = death; 1287 break; 1288 case SIGTSTP: 1289 requested_transition = catatonia; 1290 break; 1291 default: 1292 requested_transition = 0; 1293 break; 1294 } 1295} 1296 1297/* 1298 * Take the system multiuser. 1299 */ 1300state_func_t 1301multi_user() 1302{ 1303 pid_t pid; 1304 register session_t *sp; 1305 1306 requested_transition = 0; 1307 1308 /* 1309 * If the administrator has not set the security level to -1 1310 * to indicate that the kernel should not run multiuser in secure 1311 * mode, and the run script has not set a higher level of security 1312 * than level 1, then put the kernel into secure mode. 1313 */ 1314 if (getsecuritylevel() == 0) 1315 setsecuritylevel(1); 1316 1317 for (sp = sessions; sp; sp = sp->se_next) { 1318 if (sp->se_process) 1319 continue; 1320 if ((pid = start_getty(sp)) == -1) { 1321 /* serious trouble */ 1322 requested_transition = clean_ttys; 1323 break; 1324 } 1325 sp->se_process = pid; 1326 sp->se_started = time((time_t *) 0); 1327 add_session(sp); 1328 } 1329 1330 while (!requested_transition) 1331 if ((pid = waitpid(-1, (int *) 0, 0)) != -1) 1332 collect_child(pid); 1333 1334 return (state_func_t) requested_transition; 1335} 1336 1337/* 1338 * This is an n-squared algorithm. We hope it isn't run often... 1339 */ 1340state_func_t 1341clean_ttys() 1342{ 1343 register session_t *sp, *sprev; 1344 register struct ttyent *typ; 1345 register int session_index = 0; 1346 register int devlen; 1347 char *old_getty, *old_window, *old_type; 1348 1349 if (! sessions) 1350 return (state_func_t) multi_user; 1351 1352 devlen = sizeof(_PATH_DEV) - 1; 1353 while ((typ = getttyent()) != NULL) { 1354 ++session_index; 1355 1356 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1357 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1358 break; 1359 1360 if (sp) { 1361 if (sp->se_index != session_index) { 1362 warning("port %s changed utmp index from %d to %d", 1363 sp->se_device, sp->se_index, 1364 session_index); 1365 sp->se_index = session_index; 1366 } 1367 if ((typ->ty_status & TTY_ON) == 0 || 1368 typ->ty_getty == 0) { 1369 sp->se_flags |= SE_SHUTDOWN; 1370 kill(sp->se_process, SIGHUP); 1371 continue; 1372 } 1373 sp->se_flags &= ~SE_SHUTDOWN; 1374 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1375 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1376 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1377 if (setupargv(sp, typ) == 0) { 1378 warning("can't parse getty for port %s", 1379 sp->se_device); 1380 sp->se_flags |= SE_SHUTDOWN; 1381 kill(sp->se_process, SIGHUP); 1382 } 1383 else if ( !old_getty 1384 || (!old_type && sp->se_type) 1385 || (old_type && !sp->se_type) 1386 || (!old_window && sp->se_window) 1387 || (old_window && !sp->se_window) 1388 || (strcmp(old_getty, sp->se_getty) != 0) 1389 || (old_window && strcmp(old_window, sp->se_window) != 0) 1390 || (old_type && strcmp(old_type, sp->se_type) != 0) 1391 ) { 1392 /* Don't set SE_SHUTDOWN here */ 1393 sp->se_nspace = 0; 1394 sp->se_started = 0; 1395 kill(sp->se_process, SIGHUP); 1396 } 1397 if (old_getty) 1398 free(old_getty); 1399 if (old_getty) 1400 free(old_window); 1401 if (old_type) 1402 free(old_type); 1403 continue; 1404 } 1405 1406 new_session(sprev, session_index, typ); 1407 } 1408 1409 endttyent(); 1410 1411 return (state_func_t) multi_user; 1412} 1413 1414/* 1415 * Block further logins. 1416 */ 1417state_func_t 1418catatonia() 1419{ 1420 register session_t *sp; 1421 1422 for (sp = sessions; sp; sp = sp->se_next) 1423 sp->se_flags |= SE_SHUTDOWN; 1424 1425 return (state_func_t) multi_user; 1426} 1427 1428/* 1429 * Note SIGALRM. 1430 */ 1431void 1432alrm_handler(sig) 1433 int sig; 1434{ 1435 (void)sig; 1436 clang = 1; 1437} 1438 1439/* 1440 * Bring the system down to single user. 1441 */ 1442state_func_t 1443death() 1444{ 1445 register session_t *sp; 1446 register int i; 1447 pid_t pid; 1448 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1449 1450 /* NB: should send a message to the session logger to avoid blocking. */ 1451 logwtmp("~", "shutdown", ""); 1452 1453 for (sp = sessions; sp; sp = sp->se_next) { 1454 sp->se_flags |= SE_SHUTDOWN; 1455 kill(sp->se_process, SIGHUP); 1456 } 1457 1458 /* Try to run the rc.shutdown script within a period of time */ 1459 (void) runshutdown(); 1460 1461 for (i = 0; i < 2; ++i) { 1462 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1463 return (state_func_t) single_user; 1464 1465 clang = 0; 1466 alarm(DEATH_WATCH); 1467 do 1468 if ((pid = waitpid(-1, (int *)0, 0)) != -1) 1469 collect_child(pid); 1470 while (clang == 0 && errno != ECHILD); 1471 1472 if (errno == ECHILD) 1473 return (state_func_t) single_user; 1474 } 1475 1476 warning("some processes would not die; ps axl advised"); 1477 1478 return (state_func_t) single_user; 1479} 1480 1481/* 1482 * Run the system shutdown script. 1483 * 1484 * Exit codes: XXX I should document more 1485 * -2 shutdown script terminated abnormally 1486 * -1 fatal error - can't run script 1487 * 0 good. 1488 * >0 some error (exit code) 1489 */ 1490int 1491runshutdown() 1492{ 1493 pid_t pid, wpid; 1494 int status; 1495 int shutdowntimeout; 1496 size_t len; 1497 char *argv[3]; 1498 struct sigaction sa; 1499 struct stat sb; 1500 1501 /* 1502 * rc.shutdown is optional, so to prevent any unnecessary 1503 * complaints from the shell we simply don't run it if the 1504 * file does not exist. If the stat() here fails for other 1505 * reasons, we'll let the shell complain. 1506 */ 1507 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1508 return 0; 1509 1510 if ((pid = fork()) == 0) { 1511 int fd; 1512 1513 /* Assume that init already grab console as ctty before */ 1514 1515 sigemptyset(&sa.sa_mask); 1516 sa.sa_flags = 0; 1517 sa.sa_handler = SIG_IGN; 1518 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0); 1519 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0); 1520 1521 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1) 1522 warning("can't open %s: %m", _PATH_CONSOLE); 1523 else { 1524 (void) dup2(fd, 0); 1525 (void) dup2(fd, 1); 1526 (void) dup2(fd, 2); 1527 if (fd > 2) 1528 close(fd); 1529 } 1530 1531 /* 1532 * Run the shutdown script. 1533 */ 1534 argv[0] = "sh"; 1535 argv[1] = _PATH_RUNDOWN; 1536 argv[2] = 0; 1537 1538 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 1539 1540#ifdef LOGIN_CAP 1541 setprocresources(RESOURCE_RC); 1542#endif 1543 execv(_PATH_BSHELL, argv); 1544 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN); 1545 _exit(1); /* force single user mode */ 1546 } 1547 1548 if (pid == -1) { 1549 emergency("can't fork for %s on %s: %m", 1550 _PATH_BSHELL, _PATH_RUNDOWN); 1551 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 1552 continue; 1553 sleep(STALL_TIMEOUT); 1554 return -1; 1555 } 1556 1557 len = sizeof(shutdowntimeout); 1558 if (sysctlbyname("kern.shutdown_timeout", 1559 &shutdowntimeout, 1560 &len, NULL, 0) == -1 || shutdowntimeout < 2) 1561 shutdowntimeout = DEATH_SCRIPT; 1562 alarm(shutdowntimeout); 1563 clang = 0; 1564 /* 1565 * Copied from single_user(). This is a bit paranoid. 1566 * Use the same ALRM handler. 1567 */ 1568 do { 1569 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1570 collect_child(wpid); 1571 if (clang == 1) { 1572 /* we were waiting for the sub-shell */ 1573 kill(wpid, SIGTERM); 1574 warning("timeout expired for %s on %s: %m; going to single used mode", 1575 _PATH_BSHELL, _PATH_RUNDOWN); 1576 return -1; 1577 } 1578 if (wpid == -1) { 1579 if (errno == EINTR) 1580 continue; 1581 warning("wait for %s on %s failed: %m; going to single user mode", 1582 _PATH_BSHELL, _PATH_RUNDOWN); 1583 return -1; 1584 } 1585 if (wpid == pid && WIFSTOPPED(status)) { 1586 warning("init: %s on %s stopped, restarting\n", 1587 _PATH_BSHELL, _PATH_RUNDOWN); 1588 kill(pid, SIGCONT); 1589 wpid = -1; 1590 } 1591 } while (wpid != pid && !clang); 1592 1593 /* Turn off the alarm */ 1594 alarm(0); 1595 1596 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1597 requested_transition == catatonia) { 1598 /* 1599 * /etc/rc.shutdown executed /sbin/reboot; 1600 * wait for the end quietly 1601 */ 1602 sigset_t s; 1603 1604 sigfillset(&s); 1605 for (;;) 1606 sigsuspend(&s); 1607 } 1608 1609 if (!WIFEXITED(status)) { 1610 warning("%s on %s terminated abnormally, going to single user mode", 1611 _PATH_BSHELL, _PATH_RUNDOWN); 1612 return -2; 1613 } 1614 1615 if ((status = WEXITSTATUS(status)) != 0) 1616 warning("%s returned status %d", _PATH_RUNDOWN, status); 1617 1618 return status; 1619} 1620 1621char * 1622strk (char *p) 1623{ 1624 static char *t; 1625 char *q; 1626 int c; 1627 1628 if (p) 1629 t = p; 1630 if (!t) 1631 return 0; 1632 1633 c = *t; 1634 while (c == ' ' || c == '\t' ) 1635 c = *++t; 1636 if (!c) { 1637 t = 0; 1638 return 0; 1639 } 1640 q = t; 1641 if (c == '\'') { 1642 c = *++t; 1643 q = t; 1644 while (c && c != '\'') 1645 c = *++t; 1646 if (!c) /* unterminated string */ 1647 q = t = 0; 1648 else 1649 *t++ = 0; 1650 } else { 1651 while (c && c != ' ' && c != '\t' ) 1652 c = *++t; 1653 *t++ = 0; 1654 if (!c) 1655 t = 0; 1656 } 1657 return q; 1658} 1659 1660#ifdef LOGIN_CAP 1661void 1662setprocresources(cname) 1663 const char *cname; 1664{ 1665 login_cap_t *lc; 1666 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1667 setusercontext(lc, (struct passwd*)NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 1668 login_close(lc); 1669 } 1670} 1671#endif 1672