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 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)init.c 8.1 (Berkeley) 7/15/93 38 * $FreeBSD: src/sbin/init/init.c,v 1.38.2.8 2001/10/22 11:27:32 des Exp $ 39 * $DragonFly: src/sbin/init/init.c,v 1.5 2003/12/18 04:12:38 drhodus Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/ioctl.h> 44 #include <sys/mount.h> 45 #include <sys/sysctl.h> 46 #include <sys/wait.h> 47 #include <sys/stat.h> 48 49 #include <db.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <libutil.h> 53 #include <paths.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <syslog.h> 59 #include <time.h> 60 #include <ttyent.h> 61 #include <unistd.h> 62 #include <sys/reboot.h> 63 #include <err.h> 64 65 #ifdef __STDC__ 66 #include <stdarg.h> 67 #else 68 #include <varargs.h> 69 #endif 70 71 #ifdef SECURE 72 #include <pwd.h> 73 #endif 74 75 #ifdef LOGIN_CAP 76 #include <login_cap.h> 77 #endif 78 79 #include "pathnames.h" 80 81 /* 82 * Sleep times; used to prevent thrashing. 83 */ 84 #define GETTY_SPACING 5 /* N secs minimum getty spacing */ 85 #define GETTY_SLEEP 30 /* sleep N secs after spacing problem */ 86 #define GETTY_NSPACE 3 /* max. spacing count to bring reaction */ 87 #define WINDOW_WAIT 3 /* wait N secs after starting window */ 88 #define STALL_TIMEOUT 30 /* wait N secs after warning */ 89 #define DEATH_WATCH 10 /* wait N secs for procs to die */ 90 #define DEATH_SCRIPT 120 /* wait for 2min for /etc/rc.shutdown */ 91 #define RESOURCE_RC "daemon" 92 #define RESOURCE_WINDOW "default" 93 #define RESOURCE_GETTY "default" 94 95 void handle(sig_t, ...); 96 void delset(sigset_t *, ...); 97 98 void stall(char *, ...); 99 void warning(char *, ...); 100 void emergency(char *, ...); 101 void disaster(int); 102 void badsys(int); 103 int runshutdown(void); 104 105 /* 106 * We really need a recursive typedef... 107 * The following at least guarantees that the return type of (*state_t)() 108 * is sufficiently wide to hold a function pointer. 109 */ 110 typedef long (*state_func_t)(void); 111 typedef state_func_t (*state_t)(void); 112 113 state_func_t single_user(void); 114 state_func_t runcom(void); 115 state_func_t read_ttys(void); 116 state_func_t multi_user(void); 117 state_func_t clean_ttys(void); 118 state_func_t catatonia(void); 119 state_func_t death(void); 120 121 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 122 #define FALSE 0 123 #define TRUE 1 124 125 int Reboot = FALSE; 126 int howto = RB_AUTOBOOT; 127 128 void transition(state_t); 129 state_t requested_transition = runcom; 130 131 void setctty(char *); 132 133 typedef struct init_session { 134 int se_index; /* index of entry in ttys file */ 135 pid_t se_process; /* controlling process */ 136 time_t se_started; /* used to avoid thrashing */ 137 int se_flags; /* status of session */ 138 #define SE_SHUTDOWN 0x1 /* session won't be restarted */ 139 #define SE_PRESENT 0x2 /* session is in /etc/ttys */ 140 int se_nspace; /* spacing count */ 141 char *se_device; /* filename of port */ 142 char *se_getty; /* what to run on that port */ 143 char *se_getty_argv_space; /* pre-parsed argument array space */ 144 char **se_getty_argv; /* pre-parsed argument array */ 145 char *se_window; /* window system (started only once) */ 146 char *se_window_argv_space; /* pre-parsed argument array space */ 147 char **se_window_argv; /* pre-parsed argument array */ 148 char *se_type; /* default terminal type */ 149 struct init_session *se_prev; 150 struct init_session *se_next; 151 } session_t; 152 153 void free_session(session_t *); 154 session_t *new_session(session_t *, int, struct ttyent *); 155 session_t *sessions; 156 157 char **construct_argv(char *); 158 void start_window_system(session_t *); 159 void collect_child(pid_t); 160 pid_t start_getty(session_t *); 161 void transition_handler(int); 162 void alrm_handler(int); 163 void setsecuritylevel(int); 164 int getsecuritylevel(void); 165 int setupargv(session_t *, struct ttyent *); 166 #ifdef LOGIN_CAP 167 void setprocresources(const char *); 168 #endif 169 int clang; 170 171 void clear_session_logs(session_t *); 172 173 int start_session_db(void); 174 void add_session(session_t *); 175 void del_session(session_t *); 176 session_t *find_session(pid_t); 177 DB *session_db; 178 179 /* 180 * The mother of all processes. 181 */ 182 int 183 main(int argc, char **argv) 184 { 185 int c; 186 struct sigaction sa; 187 sigset_t mask; 188 struct stat sts; 189 190 191 /* Dispose of random users. */ 192 if (getuid() != 0) 193 errx(1, "%s", strerror(EPERM)); 194 195 /* System V users like to reexec init. */ 196 if (getpid() != 1) { 197 #ifdef COMPAT_SYSV_INIT 198 /* So give them what they want */ 199 if (argc > 1) { 200 if (strlen(argv[1]) == 1) { 201 register char runlevel = *argv[1]; 202 register int sig; 203 204 switch (runlevel) { 205 case '0': /* halt + poweroff */ 206 sig = SIGUSR2; 207 break; 208 case '1': /* single-user */ 209 sig = SIGTERM; 210 break; 211 case '6': /* reboot */ 212 sig = SIGINT; 213 break; 214 case 'c': /* block further logins */ 215 sig = SIGTSTP; 216 break; 217 case 'q': /* rescan /etc/ttys */ 218 sig = SIGHUP; 219 break; 220 default: 221 goto invalid; 222 } 223 kill(1, sig); 224 _exit(0); 225 } else 226 invalid: 227 errx(1, "invalid run-level ``%s''", argv[1]); 228 } else 229 #endif 230 errx(1, "already running"); 231 } 232 /* 233 * Note that this does NOT open a file... 234 * Does 'init' deserve its own facility number? 235 */ 236 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH); 237 238 /* 239 * Create an initial session. 240 */ 241 if (setsid() < 0) 242 warning("initial setsid() failed: %m"); 243 244 /* 245 * Establish an initial user so that programs running 246 * single user do not freak out and die (like passwd). 247 */ 248 if (setlogin("root") < 0) 249 warning("setlogin() failed: %m"); 250 251 if (stat("/dev/null", &sts) < 0) { 252 warning("/dev MAY BE CORRUPT! /dev/null is missing!\n"); 253 sleep(5); 254 } 255 256 /* 257 * This code assumes that we always get arguments through flags, 258 * never through bits set in some random machine register. 259 */ 260 while ((c = getopt(argc, argv, "dsf")) != -1) 261 switch (c) { 262 case 'd': 263 /* We don't support DEVFS. */ 264 break; 265 case 's': 266 requested_transition = single_user; 267 break; 268 case 'f': 269 runcom_mode = FASTBOOT; 270 break; 271 default: 272 warning("unrecognized flag '-%c'", c); 273 break; 274 } 275 276 if (optind != argc) 277 warning("ignoring excess arguments"); 278 279 /* 280 * We catch or block signals rather than ignore them, 281 * so that they get reset on exec. 282 */ 283 handle(badsys, SIGSYS, 0); 284 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, 285 SIGBUS, SIGXCPU, SIGXFSZ, 0); 286 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP, 287 SIGUSR1, SIGUSR2, 0); 288 handle(alrm_handler, SIGALRM, 0); 289 sigfillset(&mask); 290 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS, 291 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM, 292 SIGUSR1, SIGUSR2, 0); 293 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 294 sigemptyset(&sa.sa_mask); 295 sa.sa_flags = 0; 296 sa.sa_handler = SIG_IGN; 297 (void) sigaction(SIGTTIN, &sa, (struct sigaction *)0); 298 (void) sigaction(SIGTTOU, &sa, (struct sigaction *)0); 299 300 /* 301 * Paranoia. 302 */ 303 close(0); 304 close(1); 305 close(2); 306 307 /* 308 * Start the state machine. 309 */ 310 transition(requested_transition); 311 312 /* 313 * Should never reach here. 314 */ 315 return 1; 316 } 317 318 /* 319 * Associate a function with a signal handler. 320 */ 321 void 322 handle(sig_t handler, ...) 323 { 324 int sig; 325 struct sigaction sa; 326 sigset_t mask_everything; 327 va_list ap; 328 329 va_start(ap, handler); 330 331 sa.sa_handler = handler; 332 sigfillset(&mask_everything); 333 334 while ((sig = va_arg(ap, int)) != NULL) { 335 sa.sa_mask = mask_everything; 336 /* XXX SA_RESTART? */ 337 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0; 338 sigaction(sig, &sa, (struct sigaction *) 0); 339 } 340 va_end(ap); 341 } 342 343 /* 344 * Delete a set of signals from a mask. 345 */ 346 void 347 delset(sigset_t *maskp, ...) 348 { 349 int sig; 350 va_list ap; 351 352 va_start(ap, maskp); 353 354 while ((sig = va_arg(ap, int)) != NULL) 355 sigdelset(maskp, sig); 356 va_end(ap); 357 } 358 359 /* 360 * Log a message and sleep for a while (to give someone an opportunity 361 * to read it and to save log or hardcopy output if the problem is chronic). 362 * NB: should send a message to the session logger to avoid blocking. 363 */ 364 void 365 stall(char *message, ...) 366 { 367 va_list ap; 368 369 va_start(ap, message); 370 371 vsyslog(LOG_ALERT, message, ap); 372 va_end(ap); 373 sleep(STALL_TIMEOUT); 374 } 375 376 /* 377 * Like stall(), but doesn't sleep. 378 * If cpp had variadic macros, the two functions could be #defines for another. 379 * NB: should send a message to the session logger to avoid blocking. 380 */ 381 void 382 warning(char *message, ...) 383 { 384 va_list ap; 385 386 va_start(ap, message); 387 388 vsyslog(LOG_ALERT, message, ap); 389 va_end(ap); 390 } 391 392 /* 393 * Log an emergency message. 394 * NB: should send a message to the session logger to avoid blocking. 395 */ 396 void 397 emergency(char *message, ...) 398 { 399 va_list ap; 400 401 va_start(ap, message); 402 403 vsyslog(LOG_EMERG, message, ap); 404 va_end(ap); 405 } 406 407 /* 408 * Catch a SIGSYS signal. 409 * 410 * These may arise if a system does not support sysctl. 411 * We tolerate up to 25 of these, then throw in the towel. 412 */ 413 void 414 badsys(int sig) 415 { 416 static int badcount = 0; 417 418 if (badcount++ < 25) 419 return; 420 disaster(sig); 421 } 422 423 /* 424 * Catch an unexpected signal. 425 */ 426 void 427 disaster(int sig) 428 { 429 emergency("fatal signal: %s", 430 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal"); 431 432 sleep(STALL_TIMEOUT); 433 _exit(sig); /* reboot */ 434 } 435 436 /* 437 * Get the security level of the kernel. 438 */ 439 int 440 getsecuritylevel(void) 441 { 442 #ifdef KERN_SECURELVL 443 int name[2], curlevel; 444 size_t len; 445 446 name[0] = CTL_KERN; 447 name[1] = KERN_SECURELVL; 448 len = sizeof curlevel; 449 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 450 emergency("cannot get kernel security level: %s", 451 strerror(errno)); 452 return (-1); 453 } 454 return (curlevel); 455 #else 456 return (-1); 457 #endif 458 } 459 460 /* 461 * Set the security level of the kernel. 462 */ 463 void 464 setsecuritylevel(int newlevel) 465 { 466 #ifdef KERN_SECURELVL 467 int name[2], curlevel; 468 469 curlevel = getsecuritylevel(); 470 if (newlevel == curlevel) 471 return; 472 name[0] = CTL_KERN; 473 name[1] = KERN_SECURELVL; 474 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) { 475 emergency( 476 "cannot change kernel security level from %d to %d: %s", 477 curlevel, newlevel, strerror(errno)); 478 return; 479 } 480 #ifdef SECURE 481 warning("kernel security level changed from %d to %d", 482 curlevel, newlevel); 483 #endif 484 #endif 485 } 486 487 /* 488 * Change states in the finite state machine. 489 * The initial state is passed as an argument. 490 */ 491 void 492 transition(state_t s) 493 { 494 for (;;) 495 s = (state_t) (*s)(); 496 } 497 498 /* 499 * Close out the accounting files for a login session. 500 * NB: should send a message to the session logger to avoid blocking. 501 */ 502 void 503 clear_session_logs(session_t *sp) 504 { 505 char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 506 507 if (logout(line)) 508 logwtmp(line, "", ""); 509 } 510 511 /* 512 * Start a session and allocate a controlling terminal. 513 * Only called by children of init after forking. 514 */ 515 void 516 setctty(char *name) 517 { 518 int fd; 519 520 (void) revoke(name); 521 if ((fd = open(name, O_RDWR)) == -1) { 522 stall("can't open %s: %m", name); 523 _exit(1); 524 } 525 if (login_tty(fd) == -1) { 526 stall("can't get %s for controlling terminal: %m", name); 527 _exit(1); 528 } 529 } 530 531 /* 532 * Bring the system up single user. 533 */ 534 state_func_t 535 single_user(void) 536 { 537 pid_t pid, wpid; 538 int status; 539 sigset_t mask; 540 char *shell = _PATH_BSHELL; 541 char *argv[2]; 542 #ifdef SECURE 543 struct ttyent *typ; 544 struct passwd *pp; 545 static const char banner[] = 546 "Enter root password, or ^D to go multi-user\n"; 547 char *clear, *password; 548 #endif 549 #ifdef DEBUGSHELL 550 char altshell[128]; 551 #endif 552 553 if (Reboot) { 554 /* Instead of going single user, let's reboot the machine */ 555 sync(); 556 alarm(2); 557 pause(); 558 reboot(howto); 559 _exit(0); 560 } 561 562 if ((pid = fork()) == 0) { 563 /* 564 * Start the single user session. 565 */ 566 setctty(_PATH_CONSOLE); 567 568 #ifdef SECURE 569 /* 570 * Check the root password. 571 * We don't care if the console is 'on' by default; 572 * it's the only tty that can be 'off' and 'secure'. 573 */ 574 typ = getttynam("console"); 575 pp = getpwnam("root"); 576 if (typ && (typ->ty_status & TTY_SECURE) == 0 && 577 pp && *pp->pw_passwd) { 578 write(2, banner, sizeof banner - 1); 579 for (;;) { 580 clear = getpass("Password:"); 581 if (clear == 0 || *clear == '\0') 582 _exit(0); 583 password = crypt(clear, pp->pw_passwd); 584 bzero(clear, _PASSWORD_LEN); 585 if (strcmp(password, pp->pw_passwd) == 0) 586 break; 587 warning("single-user login failed\n"); 588 } 589 } 590 endttyent(); 591 endpwent(); 592 #endif /* SECURE */ 593 594 #ifdef DEBUGSHELL 595 { 596 char *cp = altshell; 597 int num; 598 599 #define SHREQUEST \ 600 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": " 601 (void)write(STDERR_FILENO, 602 SHREQUEST, sizeof(SHREQUEST) - 1); 603 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 604 num != 0 && *cp != '\n' && cp < &altshell[127]) 605 cp++; 606 *cp = '\0'; 607 if (altshell[0] != '\0') 608 shell = altshell; 609 } 610 #endif /* DEBUGSHELL */ 611 612 /* 613 * Unblock signals. 614 * We catch all the interesting ones, 615 * and those are reset to SIG_DFL on exec. 616 */ 617 sigemptyset(&mask); 618 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 619 620 /* 621 * Fire off a shell. 622 * If the default one doesn't work, try the Bourne shell. 623 */ 624 argv[0] = "-sh"; 625 argv[1] = 0; 626 execv(shell, argv); 627 emergency("can't exec %s for single user: %m", shell); 628 execv(_PATH_BSHELL, argv); 629 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 630 sleep(STALL_TIMEOUT); 631 _exit(1); 632 } 633 634 if (pid == -1) { 635 /* 636 * We are seriously hosed. Do our best. 637 */ 638 emergency("can't fork single-user shell, trying again"); 639 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 640 continue; 641 return (state_func_t) single_user; 642 } 643 644 requested_transition = 0; 645 do { 646 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 647 collect_child(wpid); 648 if (wpid == -1) { 649 if (errno == EINTR) 650 continue; 651 warning("wait for single-user shell failed: %m; restarting"); 652 return (state_func_t) single_user; 653 } 654 if (wpid == pid && WIFSTOPPED(status)) { 655 warning("init: shell stopped, restarting\n"); 656 kill(pid, SIGCONT); 657 wpid = -1; 658 } 659 } while (wpid != pid && !requested_transition); 660 661 if (requested_transition) 662 return (state_func_t) requested_transition; 663 664 if (!WIFEXITED(status)) { 665 if (WTERMSIG(status) == SIGKILL) { 666 /* 667 * reboot(8) killed shell? 668 */ 669 warning("single user shell terminated."); 670 sleep(STALL_TIMEOUT); 671 _exit(0); 672 } else { 673 warning("single user shell terminated, restarting"); 674 return (state_func_t) single_user; 675 } 676 } 677 678 runcom_mode = FASTBOOT; 679 return (state_func_t) runcom; 680 } 681 682 /* 683 * Run the system startup script. 684 */ 685 state_func_t 686 runcom(void) 687 { 688 pid_t pid, wpid; 689 int status; 690 char *argv[4]; 691 struct sigaction sa; 692 693 if ((pid = fork()) == 0) { 694 sigemptyset(&sa.sa_mask); 695 sa.sa_flags = 0; 696 sa.sa_handler = SIG_IGN; 697 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0); 698 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0); 699 700 setctty(_PATH_CONSOLE); 701 702 argv[0] = "sh"; 703 argv[1] = _PATH_RUNCOM; 704 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0; 705 argv[3] = 0; 706 707 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 708 709 #ifdef LOGIN_CAP 710 setprocresources(RESOURCE_RC); 711 #endif 712 execv(_PATH_BSHELL, argv); 713 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM); 714 _exit(1); /* force single user mode */ 715 } 716 717 if (pid == -1) { 718 emergency("can't fork for %s on %s: %m", 719 _PATH_BSHELL, _PATH_RUNCOM); 720 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 721 continue; 722 sleep(STALL_TIMEOUT); 723 return (state_func_t) single_user; 724 } 725 726 /* 727 * Copied from single_user(). This is a bit paranoid. 728 */ 729 requested_transition = 0; 730 do { 731 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 732 collect_child(wpid); 733 if (wpid == -1) { 734 if (requested_transition == death) 735 return (state_func_t) death; 736 if (errno == EINTR) 737 continue; 738 warning("wait for %s on %s failed: %m; going to single user mode", 739 _PATH_BSHELL, _PATH_RUNCOM); 740 return (state_func_t) single_user; 741 } 742 if (wpid == pid && WIFSTOPPED(status)) { 743 warning("init: %s on %s stopped, restarting\n", 744 _PATH_BSHELL, _PATH_RUNCOM); 745 kill(pid, SIGCONT); 746 wpid = -1; 747 } 748 } while (wpid != pid); 749 750 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 751 requested_transition == catatonia) { 752 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 753 sigset_t s; 754 755 sigfillset(&s); 756 for (;;) 757 sigsuspend(&s); 758 } 759 760 if (!WIFEXITED(status)) { 761 warning("%s on %s terminated abnormally, going to single user mode", 762 _PATH_BSHELL, _PATH_RUNCOM); 763 return (state_func_t) single_user; 764 } 765 766 if (WEXITSTATUS(status)) 767 return (state_func_t) single_user; 768 769 runcom_mode = AUTOBOOT; /* the default */ 770 /* NB: should send a message to the session logger to avoid blocking. */ 771 logwtmp("~", "reboot", ""); 772 return (state_func_t) read_ttys; 773 } 774 775 /* 776 * Open the session database. 777 * 778 * NB: We could pass in the size here; is it necessary? 779 */ 780 int 781 start_session_db(void) 782 { 783 if (session_db && (*session_db->close)(session_db)) 784 emergency("session database close: %s", strerror(errno)); 785 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 786 emergency("session database open: %s", strerror(errno)); 787 return (1); 788 } 789 return (0); 790 791 } 792 793 /* 794 * Add a new login session. 795 */ 796 void 797 add_session(session_t *sp) 798 { 799 DBT key; 800 DBT data; 801 802 key.data = &sp->se_process; 803 key.size = sizeof sp->se_process; 804 data.data = &sp; 805 data.size = sizeof sp; 806 807 if ((*session_db->put)(session_db, &key, &data, 0)) 808 emergency("insert %d: %s", sp->se_process, strerror(errno)); 809 } 810 811 /* 812 * Delete an old login session. 813 */ 814 void 815 del_session(session_t *sp) 816 { 817 DBT key; 818 819 key.data = &sp->se_process; 820 key.size = sizeof sp->se_process; 821 822 if ((*session_db->del)(session_db, &key, 0)) 823 emergency("delete %d: %s", sp->se_process, strerror(errno)); 824 } 825 826 /* 827 * Look up a login session by pid. 828 */ 829 session_t * 830 find_session(pid_t pid) 831 { 832 DBT key; 833 DBT data; 834 session_t *ret; 835 836 key.data = &pid; 837 key.size = sizeof pid; 838 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 839 return 0; 840 bcopy(data.data, (char *)&ret, sizeof(ret)); 841 return ret; 842 } 843 844 /* 845 * Construct an argument vector from a command line. 846 */ 847 char ** 848 construct_argv(char *command) 849 { 850 char *strk (char *); 851 register int argc = 0; 852 register char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1) 853 * sizeof (char *)); 854 855 if ((argv[argc++] = strk(command)) == 0) { 856 free(argv); 857 return (NULL); 858 } 859 while ((argv[argc++] = strk((char *) 0)) != NULL) 860 continue; 861 return argv; 862 } 863 864 /* 865 * Deallocate a session descriptor. 866 */ 867 void 868 free_session(register session_t *sp) 869 { 870 free(sp->se_device); 871 if (sp->se_getty) { 872 free(sp->se_getty); 873 free(sp->se_getty_argv_space); 874 free(sp->se_getty_argv); 875 } 876 if (sp->se_window) { 877 free(sp->se_window); 878 free(sp->se_window_argv_space); 879 free(sp->se_window_argv); 880 } 881 if (sp->se_type) 882 free(sp->se_type); 883 free(sp); 884 } 885 886 /* 887 * Allocate a new session descriptor. 888 * Mark it SE_PRESENT. 889 */ 890 session_t * 891 new_session(session_t *sprev, int session_index, register struct ttyent *typ) 892 { 893 register session_t *sp; 894 int fd; 895 896 if ((typ->ty_status & TTY_ON) == 0 || 897 typ->ty_name == 0 || 898 typ->ty_getty == 0) 899 return 0; 900 901 sp = (session_t *) calloc(1, sizeof (session_t)); 902 903 sp->se_index = session_index; 904 sp->se_flags |= SE_PRESENT; 905 906 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 907 (void) sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 908 909 /* 910 * Attempt to open the device, if we get "device not configured" 911 * then don't add the device to the session list. 912 */ 913 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 914 if (errno == ENXIO) { 915 free_session(sp); 916 return (0); 917 } 918 } else 919 close(fd); 920 921 if (setupargv(sp, typ) == 0) { 922 free_session(sp); 923 return (0); 924 } 925 926 sp->se_next = 0; 927 if (sprev == 0) { 928 sessions = sp; 929 sp->se_prev = 0; 930 } else { 931 sprev->se_next = sp; 932 sp->se_prev = sprev; 933 } 934 935 return sp; 936 } 937 938 /* 939 * Calculate getty and if useful window argv vectors. 940 */ 941 int 942 setupargv(session_t *sp, struct ttyent *typ) 943 { 944 945 if (sp->se_getty) { 946 free(sp->se_getty); 947 free(sp->se_getty_argv_space); 948 free(sp->se_getty_argv); 949 } 950 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 951 (void) sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 952 sp->se_getty_argv_space = strdup(sp->se_getty); 953 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 954 if (sp->se_getty_argv == 0) { 955 warning("can't parse getty for port %s", sp->se_device); 956 free(sp->se_getty); 957 free(sp->se_getty_argv_space); 958 sp->se_getty = sp->se_getty_argv_space = 0; 959 return (0); 960 } 961 if (sp->se_window) { 962 free(sp->se_window); 963 free(sp->se_window_argv_space); 964 free(sp->se_window_argv); 965 } 966 sp->se_window = sp->se_window_argv_space = 0; 967 sp->se_window_argv = 0; 968 if (typ->ty_window) { 969 sp->se_window = strdup(typ->ty_window); 970 sp->se_window_argv_space = strdup(sp->se_window); 971 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 972 if (sp->se_window_argv == 0) { 973 warning("can't parse window for port %s", 974 sp->se_device); 975 free(sp->se_window_argv_space); 976 free(sp->se_window); 977 sp->se_window = sp->se_window_argv_space = 0; 978 return (0); 979 } 980 } 981 if (sp->se_type) 982 free(sp->se_type); 983 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 984 return (1); 985 } 986 987 /* 988 * Walk the list of ttys and create sessions for each active line. 989 */ 990 state_func_t 991 read_ttys(void) 992 { 993 int session_index = 0; 994 register session_t *sp, *snext; 995 register struct ttyent *typ; 996 997 /* 998 * Destroy any previous session state. 999 * There shouldn't be any, but just in case... 1000 */ 1001 for (sp = sessions; sp; sp = snext) { 1002 if (sp->se_process) 1003 clear_session_logs(sp); 1004 snext = sp->se_next; 1005 free_session(sp); 1006 } 1007 sessions = 0; 1008 if (start_session_db()) 1009 return (state_func_t) single_user; 1010 1011 /* 1012 * Allocate a session entry for each active port. 1013 * Note that sp starts at 0. 1014 */ 1015 while ((typ = getttyent()) != NULL) 1016 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1017 sp = snext; 1018 1019 endttyent(); 1020 1021 return (state_func_t) multi_user; 1022 } 1023 1024 /* 1025 * Start a window system running. 1026 */ 1027 void 1028 start_window_system(session_t *sp) 1029 { 1030 pid_t pid; 1031 sigset_t mask; 1032 char term[64], *env[2]; 1033 1034 if ((pid = fork()) == -1) { 1035 emergency("can't fork for window system on port %s: %m", 1036 sp->se_device); 1037 /* hope that getty fails and we can try again */ 1038 return; 1039 } 1040 1041 if (pid) 1042 return; 1043 1044 sigemptyset(&mask); 1045 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1046 1047 if (setsid() < 0) 1048 emergency("setsid failed (window) %m"); 1049 1050 #ifdef LOGIN_CAP 1051 setprocresources(RESOURCE_WINDOW); 1052 #endif 1053 if (sp->se_type) { 1054 /* Don't use malloc after fork */ 1055 strcpy(term, "TERM="); 1056 strncat(term, sp->se_type, sizeof(term) - 6); 1057 env[0] = term; 1058 env[1] = 0; 1059 } 1060 else 1061 env[0] = 0; 1062 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1063 stall("can't exec window system '%s' for port %s: %m", 1064 sp->se_window_argv[0], sp->se_device); 1065 _exit(1); 1066 } 1067 1068 /* 1069 * Start a login session running. 1070 */ 1071 pid_t 1072 start_getty(session_t *sp) 1073 { 1074 pid_t pid; 1075 sigset_t mask; 1076 time_t current_time = time((time_t *) 0); 1077 int too_quick = 0; 1078 char term[64], *env[2]; 1079 1080 if (current_time >= sp->se_started && 1081 current_time - sp->se_started < GETTY_SPACING) { 1082 if (++sp->se_nspace > GETTY_NSPACE) { 1083 sp->se_nspace = 0; 1084 too_quick = 1; 1085 } 1086 } else 1087 sp->se_nspace = 0; 1088 1089 /* 1090 * fork(), not vfork() -- we can't afford to block. 1091 */ 1092 if ((pid = fork()) == -1) { 1093 emergency("can't fork for getty on port %s: %m", sp->se_device); 1094 return -1; 1095 } 1096 1097 if (pid) 1098 return pid; 1099 1100 if (too_quick) { 1101 warning("getty repeating too quickly on port %s, sleeping %d secs", 1102 sp->se_device, GETTY_SLEEP); 1103 sleep((unsigned) GETTY_SLEEP); 1104 } 1105 1106 if (sp->se_window) { 1107 start_window_system(sp); 1108 sleep(WINDOW_WAIT); 1109 } 1110 1111 sigemptyset(&mask); 1112 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1113 1114 #ifdef LOGIN_CAP 1115 setprocresources(RESOURCE_GETTY); 1116 #endif 1117 if (sp->se_type) { 1118 /* Don't use malloc after fork */ 1119 strcpy(term, "TERM="); 1120 strncat(term, sp->se_type, sizeof(term) - 6); 1121 env[0] = term; 1122 env[1] = 0; 1123 } 1124 else 1125 env[0] = 0; 1126 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1127 stall("can't exec getty '%s' for port %s: %m", 1128 sp->se_getty_argv[0], sp->se_device); 1129 _exit(1); 1130 } 1131 1132 /* 1133 * Collect exit status for a child. 1134 * If an exiting login, start a new login running. 1135 */ 1136 void 1137 collect_child(pid_t pid) 1138 { 1139 register session_t *sp, *sprev, *snext; 1140 1141 if (! sessions) 1142 return; 1143 1144 if (! (sp = find_session(pid))) 1145 return; 1146 1147 clear_session_logs(sp); 1148 del_session(sp); 1149 sp->se_process = 0; 1150 1151 if (sp->se_flags & SE_SHUTDOWN) { 1152 if ((sprev = sp->se_prev) != NULL) 1153 sprev->se_next = sp->se_next; 1154 else 1155 sessions = sp->se_next; 1156 if ((snext = sp->se_next) != NULL) 1157 snext->se_prev = sp->se_prev; 1158 free_session(sp); 1159 return; 1160 } 1161 1162 if ((pid = start_getty(sp)) == -1) { 1163 /* serious trouble */ 1164 requested_transition = clean_ttys; 1165 return; 1166 } 1167 1168 sp->se_process = pid; 1169 sp->se_started = time((time_t *) 0); 1170 add_session(sp); 1171 } 1172 1173 /* 1174 * Catch a signal and request a state transition. 1175 */ 1176 void 1177 transition_handler(int sig) 1178 { 1179 1180 switch (sig) { 1181 case SIGHUP: 1182 requested_transition = clean_ttys; 1183 break; 1184 case SIGUSR2: 1185 howto = RB_POWEROFF; 1186 case SIGUSR1: 1187 howto |= RB_HALT; 1188 case SIGINT: 1189 Reboot = TRUE; 1190 case SIGTERM: 1191 requested_transition = death; 1192 break; 1193 case SIGTSTP: 1194 requested_transition = catatonia; 1195 break; 1196 default: 1197 requested_transition = 0; 1198 break; 1199 } 1200 } 1201 1202 /* 1203 * Take the system multiuser. 1204 */ 1205 state_func_t 1206 multi_user(void) 1207 { 1208 pid_t pid; 1209 register session_t *sp; 1210 1211 requested_transition = 0; 1212 1213 /* 1214 * If the administrator has not set the security level to -1 1215 * to indicate that the kernel should not run multiuser in secure 1216 * mode, and the run script has not set a higher level of security 1217 * than level 1, then put the kernel into secure mode. 1218 */ 1219 if (getsecuritylevel() == 0) 1220 setsecuritylevel(1); 1221 1222 for (sp = sessions; sp; sp = sp->se_next) { 1223 if (sp->se_process) 1224 continue; 1225 if ((pid = start_getty(sp)) == -1) { 1226 /* serious trouble */ 1227 requested_transition = clean_ttys; 1228 break; 1229 } 1230 sp->se_process = pid; 1231 sp->se_started = time((time_t *) 0); 1232 add_session(sp); 1233 } 1234 1235 while (!requested_transition) 1236 if ((pid = waitpid(-1, (int *) 0, 0)) != -1) 1237 collect_child(pid); 1238 1239 return (state_func_t) requested_transition; 1240 } 1241 1242 /* 1243 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1244 */ 1245 state_func_t 1246 clean_ttys(void) 1247 { 1248 register session_t *sp, *sprev; 1249 register struct ttyent *typ; 1250 register int session_index = 0; 1251 register int devlen; 1252 char *old_getty, *old_window, *old_type; 1253 1254 if (! sessions) 1255 return (state_func_t) multi_user; 1256 1257 /* 1258 * mark all sessions for death, (!SE_PRESENT) 1259 * as we find or create new ones they'll be marked as keepers, 1260 * we'll later nuke all the ones not found in /etc/ttys 1261 */ 1262 for (sp = sessions; sp != NULL; sp = sp->se_next) 1263 sp->se_flags &= ~SE_PRESENT; 1264 1265 devlen = sizeof(_PATH_DEV) - 1; 1266 while ((typ = getttyent()) != NULL) { 1267 ++session_index; 1268 1269 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1270 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1271 break; 1272 1273 if (sp) { 1274 /* we want this one to live */ 1275 sp->se_flags |= SE_PRESENT; 1276 if (sp->se_index != session_index) { 1277 warning("port %s changed utmp index from %d to %d", 1278 sp->se_device, sp->se_index, 1279 session_index); 1280 sp->se_index = session_index; 1281 } 1282 if ((typ->ty_status & TTY_ON) == 0 || 1283 typ->ty_getty == 0) { 1284 sp->se_flags |= SE_SHUTDOWN; 1285 kill(sp->se_process, SIGHUP); 1286 continue; 1287 } 1288 sp->se_flags &= ~SE_SHUTDOWN; 1289 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1290 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1291 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1292 if (setupargv(sp, typ) == 0) { 1293 warning("can't parse getty for port %s", 1294 sp->se_device); 1295 sp->se_flags |= SE_SHUTDOWN; 1296 kill(sp->se_process, SIGHUP); 1297 } 1298 else if ( !old_getty 1299 || (!old_type && sp->se_type) 1300 || (old_type && !sp->se_type) 1301 || (!old_window && sp->se_window) 1302 || (old_window && !sp->se_window) 1303 || (strcmp(old_getty, sp->se_getty) != 0) 1304 || (old_window && strcmp(old_window, sp->se_window) != 0) 1305 || (old_type && strcmp(old_type, sp->se_type) != 0) 1306 ) { 1307 /* Don't set SE_SHUTDOWN here */ 1308 sp->se_nspace = 0; 1309 sp->se_started = 0; 1310 kill(sp->se_process, SIGHUP); 1311 } 1312 if (old_getty) 1313 free(old_getty); 1314 if (old_window) 1315 free(old_window); 1316 if (old_type) 1317 free(old_type); 1318 continue; 1319 } 1320 1321 new_session(sprev, session_index, typ); 1322 } 1323 1324 endttyent(); 1325 1326 /* 1327 * sweep through and kill all deleted sessions 1328 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1329 */ 1330 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1331 if ((sp->se_flags & SE_PRESENT) == 0) { 1332 sp->se_flags |= SE_SHUTDOWN; 1333 kill(sp->se_process, SIGHUP); 1334 } 1335 } 1336 1337 return (state_func_t) multi_user; 1338 } 1339 1340 /* 1341 * Block further logins. 1342 */ 1343 state_func_t 1344 catatonia(void) 1345 { 1346 register session_t *sp; 1347 1348 for (sp = sessions; sp; sp = sp->se_next) 1349 sp->se_flags |= SE_SHUTDOWN; 1350 1351 return (state_func_t) multi_user; 1352 } 1353 1354 /* 1355 * Note SIGALRM. 1356 */ 1357 void 1358 alrm_handler(int sig) 1359 { 1360 (void)sig; 1361 clang = 1; 1362 } 1363 1364 /* 1365 * Bring the system down to single user. 1366 */ 1367 state_func_t 1368 death(void) 1369 { 1370 register session_t *sp; 1371 register int i; 1372 pid_t pid; 1373 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1374 1375 /* NB: should send a message to the session logger to avoid blocking. */ 1376 logwtmp("~", "shutdown", ""); 1377 1378 for (sp = sessions; sp; sp = sp->se_next) { 1379 sp->se_flags |= SE_SHUTDOWN; 1380 kill(sp->se_process, SIGHUP); 1381 } 1382 1383 /* Try to run the rc.shutdown script within a period of time */ 1384 (void) runshutdown(); 1385 1386 for (i = 0; i < 2; ++i) { 1387 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1388 return (state_func_t) single_user; 1389 1390 clang = 0; 1391 alarm(DEATH_WATCH); 1392 do 1393 if ((pid = waitpid(-1, (int *)0, 0)) != -1) 1394 collect_child(pid); 1395 while (clang == 0 && errno != ECHILD); 1396 1397 if (errno == ECHILD) 1398 return (state_func_t) single_user; 1399 } 1400 1401 warning("some processes would not die; ps axl advised"); 1402 1403 return (state_func_t) single_user; 1404 } 1405 1406 /* 1407 * Run the system shutdown script. 1408 * 1409 * Exit codes: XXX I should document more 1410 * -2 shutdown script terminated abnormally 1411 * -1 fatal error - can't run script 1412 * 0 good. 1413 * >0 some error (exit code) 1414 */ 1415 int 1416 runshutdown(void) 1417 { 1418 pid_t pid, wpid; 1419 int status; 1420 int shutdowntimeout; 1421 size_t len; 1422 char *argv[4]; 1423 struct sigaction sa; 1424 struct stat sb; 1425 1426 /* 1427 * rc.shutdown is optional, so to prevent any unnecessary 1428 * complaints from the shell we simply don't run it if the 1429 * file does not exist. If the stat() here fails for other 1430 * reasons, we'll let the shell complain. 1431 */ 1432 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1433 return 0; 1434 1435 if ((pid = fork()) == 0) { 1436 int fd; 1437 1438 /* Assume that init already grab console as ctty before */ 1439 1440 sigemptyset(&sa.sa_mask); 1441 sa.sa_flags = 0; 1442 sa.sa_handler = SIG_IGN; 1443 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0); 1444 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0); 1445 1446 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1) 1447 warning("can't open %s: %m", _PATH_CONSOLE); 1448 else { 1449 (void) dup2(fd, 0); 1450 (void) dup2(fd, 1); 1451 (void) dup2(fd, 2); 1452 if (fd > 2) 1453 close(fd); 1454 } 1455 1456 /* 1457 * Run the shutdown script. 1458 */ 1459 argv[0] = "sh"; 1460 argv[1] = _PATH_RUNDOWN; 1461 if (Reboot) 1462 argv[2] = "reboot"; 1463 else 1464 argv[2] = "single"; 1465 argv[3] = 0; 1466 1467 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 1468 1469 #ifdef LOGIN_CAP 1470 setprocresources(RESOURCE_RC); 1471 #endif 1472 execv(_PATH_BSHELL, argv); 1473 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN); 1474 _exit(1); /* force single user mode */ 1475 } 1476 1477 if (pid == -1) { 1478 emergency("can't fork for %s on %s: %m", 1479 _PATH_BSHELL, _PATH_RUNDOWN); 1480 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 1481 continue; 1482 sleep(STALL_TIMEOUT); 1483 return -1; 1484 } 1485 1486 len = sizeof(shutdowntimeout); 1487 if (sysctlbyname("kern.shutdown_timeout", 1488 &shutdowntimeout, 1489 &len, NULL, 0) == -1 || shutdowntimeout < 2) 1490 shutdowntimeout = DEATH_SCRIPT; 1491 alarm(shutdowntimeout); 1492 clang = 0; 1493 /* 1494 * Copied from single_user(). This is a bit paranoid. 1495 * Use the same ALRM handler. 1496 */ 1497 do { 1498 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1499 collect_child(wpid); 1500 if (clang == 1) { 1501 /* we were waiting for the sub-shell */ 1502 kill(wpid, SIGTERM); 1503 warning("timeout expired for %s on %s: %m; going to single user mode", 1504 _PATH_BSHELL, _PATH_RUNDOWN); 1505 return -1; 1506 } 1507 if (wpid == -1) { 1508 if (errno == EINTR) 1509 continue; 1510 warning("wait for %s on %s failed: %m; going to single user mode", 1511 _PATH_BSHELL, _PATH_RUNDOWN); 1512 return -1; 1513 } 1514 if (wpid == pid && WIFSTOPPED(status)) { 1515 warning("init: %s on %s stopped, restarting\n", 1516 _PATH_BSHELL, _PATH_RUNDOWN); 1517 kill(pid, SIGCONT); 1518 wpid = -1; 1519 } 1520 } while (wpid != pid && !clang); 1521 1522 /* Turn off the alarm */ 1523 alarm(0); 1524 1525 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1526 requested_transition == catatonia) { 1527 /* 1528 * /etc/rc.shutdown executed /sbin/reboot; 1529 * wait for the end quietly 1530 */ 1531 sigset_t s; 1532 1533 sigfillset(&s); 1534 for (;;) 1535 sigsuspend(&s); 1536 } 1537 1538 if (!WIFEXITED(status)) { 1539 warning("%s on %s terminated abnormally, going to single user mode", 1540 _PATH_BSHELL, _PATH_RUNDOWN); 1541 return -2; 1542 } 1543 1544 if ((status = WEXITSTATUS(status)) != 0) 1545 warning("%s returned status %d", _PATH_RUNDOWN, status); 1546 1547 return status; 1548 } 1549 1550 char * 1551 strk (char *p) 1552 { 1553 static char *t; 1554 char *q; 1555 int c; 1556 1557 if (p) 1558 t = p; 1559 if (!t) 1560 return 0; 1561 1562 c = *t; 1563 while (c == ' ' || c == '\t' ) 1564 c = *++t; 1565 if (!c) { 1566 t = 0; 1567 return 0; 1568 } 1569 q = t; 1570 if (c == '\'') { 1571 c = *++t; 1572 q = t; 1573 while (c && c != '\'') 1574 c = *++t; 1575 if (!c) /* unterminated string */ 1576 q = t = 0; 1577 else 1578 *t++ = 0; 1579 } else { 1580 while (c && c != ' ' && c != '\t' ) 1581 c = *++t; 1582 *t++ = 0; 1583 if (!c) 1584 t = 0; 1585 } 1586 return q; 1587 } 1588 1589 #ifdef LOGIN_CAP 1590 void 1591 setprocresources(const char *cname) 1592 { 1593 login_cap_t *lc; 1594 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1595 setusercontext(lc, (struct passwd*)NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 1596 login_close(lc); 1597 } 1598 } 1599 #endif 1600