1 /*- 2 * Copyright (c) 1980, 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)csh.c 5.26 (Berkeley) 6/8/91"; 42 static char rcsid[] = "$Header: /cvsroot/src/bin/csh/csh.c,v 1.3 1993/03/23 00:24:16 cgd Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/ioctl.h> 47 #include <sys/stat.h> 48 #include <fcntl.h> 49 #include <errno.h> 50 #include <pwd.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <locale.h> 54 #include <unistd.h> 55 #if __STDC__ 56 # include <stdarg.h> 57 #else 58 # include <varargs.h> 59 #endif 60 61 #include "csh.h" 62 #include "extern.h" 63 #include "pathnames.h" 64 65 extern bool MapsAreInited; 66 extern bool NLSMapsAreInited; 67 68 /* 69 * C Shell 70 * 71 * Bill Joy, UC Berkeley, California, USA 72 * October 1978, May 1980 73 * 74 * Jim Kulp, IIASA, Laxenburg, Austria 75 * April 1980 76 * 77 * Christos Zoulas, Cornell University 78 * June, 1991 79 */ 80 81 Char *dumphist[] = {STRhistory, STRmh, 0, 0}; 82 Char *loadhist[] = {STRsource, STRmh, STRhistfile, 0}; 83 84 int nofile = 0; 85 bool reenter = 0; 86 bool nverbose = 0; 87 bool nexececho = 0; 88 bool quitit = 0; 89 bool fast = 0; 90 bool batch = 0; 91 bool mflag = 0; 92 bool prompt = 1; 93 bool enterhist = 0; 94 bool tellwhat = 0; 95 96 extern char **environ; 97 98 static int srccat __P((Char *, Char *)); 99 static int srcfile __P((char *, bool, bool)); 100 static void phup __P((int)); 101 static void srcunit __P((int, bool, bool)); 102 static void mailchk __P((void)); 103 static Char **defaultpath __P((void)); 104 105 int 106 main(argc, argv) 107 int argc; 108 char **argv; 109 { 110 register Char *cp; 111 register char *tcp; 112 register int f; 113 register char **tempv; 114 struct sigvec osv; 115 116 117 settimes(); /* Immed. estab. timing base */ 118 119 /* 120 * Initialize non constant strings 121 */ 122 #ifdef _PATH_BSHELL 123 STR_BSHELL = SAVE(_PATH_BSHELL); 124 #endif 125 #ifdef _PATH_CSHELL 126 STR_SHELLPATH = SAVE(_PATH_CSHELL); 127 #endif 128 STR_environ = blk2short(environ); 129 environ = short2blk(STR_environ); /* So that we can free it */ 130 STR_WORD_CHARS = SAVE(WORD_CHARS); 131 132 HIST = '!'; 133 HISTSUB = '^'; 134 word_chars = STR_WORD_CHARS; 135 136 tempv = argv; 137 if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ 138 quitit = 1; 139 uid = getuid(); 140 gid = getgid(); 141 /* 142 * We are a login shell if: 1. we were invoked as -<something> and we had 143 * no arguments 2. or we were invoked only with the -l flag 144 */ 145 loginsh = (**tempv == '-' && argc == 1) || 146 (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && 147 tempv[1][2] == '\0'); 148 149 if (loginsh && **tempv != '-') { 150 /* 151 * Mangle the argv space 152 */ 153 tempv[1][0] = '\0'; 154 tempv[1][1] = '\0'; 155 tempv[1] = NULL; 156 for (tcp = *tempv; *tcp++;); 157 for (tcp--; tcp >= *tempv; tcp--) 158 tcp[1] = tcp[0]; 159 *++tcp = '-'; 160 argc--; 161 } 162 if (loginsh) 163 (void) time(&chktim); 164 165 AsciiOnly = 1; 166 #ifdef NLS 167 (void) setlocale(LC_ALL, ""); 168 { 169 int k; 170 171 for (k = 0200; k <= 0377 && !Isprint(k); k++); 172 AsciiOnly = k > 0377; 173 } 174 #else 175 AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL; 176 #endif /* NLS */ 177 178 /* 179 * Move the descriptors to safe places. The variable didfds is 0 while we 180 * have only FSH* to work with. When didfds is true, we have 0,1,2 and 181 * prefer to use these. 182 */ 183 initdesc(); 184 185 /* 186 * Initialize the shell variables. ARGV and PROMPT are initialized later. 187 * STATUS is also munged in several places. CHILD is munged when 188 * forking/waiting 189 */ 190 set(STRstatus, Strsave(STR0)); 191 192 if ((tcp = getenv("HOME")) != NULL) 193 cp = SAVE(tcp); 194 else 195 cp = NULL; 196 197 if (cp == NULL) 198 fast = 1; /* No home -> can't read scripts */ 199 else 200 set(STRhome, cp); 201 dinit(cp); /* dinit thinks that HOME == cwd in a login 202 * shell */ 203 /* 204 * Grab other useful things from the environment. Should we grab 205 * everything?? 206 */ 207 if ((tcp = getenv("LOGNAME")) != NULL || 208 (tcp = getenv("USER")) != NULL) 209 set(STRuser, SAVE(tcp)); 210 if ((tcp = getenv("TERM")) != NULL) 211 set(STRterm, SAVE(tcp)); 212 213 /* 214 * Re-initialize path if set in environment 215 */ 216 if ((tcp = getenv("PATH")) == NULL) 217 set1(STRpath, defaultpath(), &shvhed); 218 else 219 importpath(SAVE(tcp)); 220 221 set(STRshell, Strsave(STR_SHELLPATH)); 222 223 doldol = putn((int) getpid()); /* For $$ */ 224 shtemp = Strspl(STRtmpsh, doldol); /* For << */ 225 226 /* 227 * Record the interrupt states from the parent process. If the parent is 228 * non-interruptible our hand must be forced or we (and our children) won't 229 * be either. Our children inherit termination from our parent. We catch it 230 * only if we are the login shell. 231 */ 232 /* parents interruptibility */ 233 (void) sigvec(SIGINT, NULL, &osv); 234 parintr = (void (*) ()) osv.sv_handler; 235 (void) sigvec(SIGTERM, NULL, &osv); 236 parterm = (void (*) ()) osv.sv_handler; 237 238 if (loginsh) { 239 (void) signal(SIGHUP, phup); /* exit processing on HUP */ 240 (void) signal(SIGXCPU, phup); /* ...and on XCPU */ 241 (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ 242 } 243 244 /* 245 * Process the arguments. 246 * 247 * Note that processing of -v/-x is actually delayed till after script 248 * processing. 249 * 250 * We set the first character of our name to be '-' if we are a shell running 251 * interruptible commands. Many programs which examine ps'es use this to 252 * filter such shells out. 253 */ 254 argc--, tempv++; 255 while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { 256 do 257 switch (*tcp++) { 258 259 case 0: /* - Interruptible, no prompt */ 260 prompt = 0; 261 setintr = 1; 262 nofile = 1; 263 break; 264 265 case 'b': /* -b Next arg is input file */ 266 batch = 1; 267 break; 268 269 case 'c': /* -c Command input from arg */ 270 if (argc == 1) 271 xexit(0); 272 argc--, tempv++; 273 arginp = SAVE(tempv[0]); 274 prompt = 0; 275 nofile = 1; 276 break; 277 278 case 'e': /* -e Exit on any error */ 279 exiterr = 1; 280 break; 281 282 case 'f': /* -f Fast start */ 283 fast = 1; 284 break; 285 286 case 'i': /* -i Interactive, even if !intty */ 287 intact = 1; 288 nofile = 1; 289 break; 290 291 case 'm': /* -m read .cshrc (from su) */ 292 mflag = 1; 293 break; 294 295 case 'n': /* -n Don't execute */ 296 noexec = 1; 297 break; 298 299 case 'q': /* -q (Undoc'd) ... die on quit */ 300 quitit = 1; 301 break; 302 303 case 's': /* -s Read from std input */ 304 nofile = 1; 305 break; 306 307 case 't': /* -t Read one line from input */ 308 onelflg = 2; 309 prompt = 0; 310 nofile = 1; 311 break; 312 313 case 'v': /* -v Echo hist expanded input */ 314 nverbose = 1; /* ... later */ 315 break; 316 317 case 'x': /* -x Echo just before execution */ 318 nexececho = 1; /* ... later */ 319 break; 320 321 case 'V': /* -V Echo hist expanded input */ 322 setNS(STRverbose); /* NOW! */ 323 break; 324 325 case 'X': /* -X Echo just before execution */ 326 setNS(STRecho); /* NOW! */ 327 break; 328 329 } while (*tcp); 330 tempv++, argc--; 331 } 332 333 if (quitit) /* With all due haste, for debugging */ 334 (void) signal(SIGQUIT, SIG_DFL); 335 336 /* 337 * Unless prevented by -, -c, -i, -s, or -t, if there are remaining 338 * arguments the first of them is the name of a shell file from which to 339 * read commands. 340 */ 341 if (nofile == 0 && argc > 0) { 342 nofile = open(tempv[0], O_RDONLY); 343 if (nofile < 0) { 344 child = 1; /* So this doesn't return */ 345 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 346 } 347 ffile = SAVE(tempv[0]); 348 /* 349 * Replace FSHIN. Handle /dev/std{in,out,err} specially 350 * since once they are closed we cannot open them again. 351 * In that case we use our own saved descriptors 352 */ 353 if ((SHIN = dmove(nofile, FSHIN)) < 0) 354 switch(nofile) { 355 case 0: 356 SHIN = FSHIN; 357 break; 358 case 1: 359 SHIN = FSHOUT; 360 break; 361 case 2: 362 SHIN = FSHDIAG; 363 break; 364 default: 365 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 366 break; 367 } 368 (void) ioctl(SHIN, FIOCLEX, NULL); 369 prompt = 0; 370 /* argc not used any more */ tempv++; 371 } 372 intty = isatty(SHIN); 373 intty |= intact; 374 if (intty || (intact && isatty(SHOUT))) { 375 if (!batch && (uid != geteuid() || gid != getegid())) { 376 errno = EACCES; 377 child = 1; /* So this doesn't return */ 378 stderror(ERR_SYSTEM, "csh", strerror(errno)); 379 } 380 } 381 /* 382 * Decide whether we should play with signals or not. If we are explicitly 383 * told (via -i, or -) or we are a login shell (arg0 starts with -) or the 384 * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") 385 * Note that in only the login shell is it likely that parent may have set 386 * signals to be ignored 387 */ 388 if (loginsh || intact || intty && isatty(SHOUT)) 389 setintr = 1; 390 settell(); 391 /* 392 * Save the remaining arguments in argv. 393 */ 394 setq(STRargv, blk2short(tempv), &shvhed); 395 396 /* 397 * Set up the prompt. 398 */ 399 if (prompt) { 400 set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); 401 /* that's a meta-questionmark */ 402 set(STRprompt2, Strsave(STRmquestion)); 403 } 404 405 /* 406 * If we are an interactive shell, then start fiddling with the signals; 407 * this is a tricky game. 408 */ 409 shpgrp = getpgrp(); 410 opgrp = tpgrp = -1; 411 if (setintr) { 412 **argv = '-'; 413 if (!quitit) /* Wary! */ 414 (void) signal(SIGQUIT, SIG_IGN); 415 (void) signal(SIGINT, pintr); 416 (void) sigblock(sigmask(SIGINT)); 417 (void) signal(SIGTERM, SIG_IGN); 418 if (quitit == 0 && arginp == 0) { 419 (void) signal(SIGTSTP, SIG_IGN); 420 (void) signal(SIGTTIN, SIG_IGN); 421 (void) signal(SIGTTOU, SIG_IGN); 422 /* 423 * Wait till in foreground, in case someone stupidly runs csh & 424 * dont want to try to grab away the tty. 425 */ 426 if (isatty(FSHDIAG)) 427 f = FSHDIAG; 428 else if (isatty(FSHOUT)) 429 f = FSHOUT; 430 else if (isatty(OLDSTD)) 431 f = OLDSTD; 432 else 433 f = -1; 434 retry: 435 if ((tpgrp = tcgetpgrp(f)) != -1) { 436 if (tpgrp != shpgrp) { 437 sig_t old = signal(SIGTTIN, SIG_DFL); 438 (void) kill(0, SIGTTIN); 439 (void) signal(SIGTTIN, old); 440 goto retry; 441 } 442 opgrp = shpgrp; 443 shpgrp = getpid(); 444 tpgrp = shpgrp; 445 /* 446 * Setpgid will fail if we are a session leader and 447 * mypid == mypgrp (POSIX 4.3.3) 448 */ 449 if (opgrp != shpgrp) 450 if (setpgid(0, shpgrp) == -1) 451 goto notty; 452 /* 453 * We do that after we set our process group, to make sure 454 * that the process group belongs to a process in the same 455 * session as the tty (our process and our group) (POSIX 7.2.4) 456 */ 457 if (tcsetpgrp(f, shpgrp) == -1) 458 goto notty; 459 (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); 460 } 461 if (tpgrp == -1) { 462 notty: 463 xprintf("Warning: no access to tty (%s).\n", strerror(errno)); 464 xprintf("Thus no job control in this shell.\n"); 465 } 466 } 467 } 468 if ((setintr == 0) && (parintr == SIG_DFL)) 469 setintr = 1; 470 (void) signal(SIGCHLD, pchild); /* while signals not ready */ 471 472 /* 473 * Set an exit here in case of an interrupt or error reading the shell 474 * start-up scripts. 475 */ 476 reenter = setexit(); /* PWP */ 477 haderr = 0; /* In case second time through */ 478 if (!fast && reenter == 0) { 479 /* Will have value(STRhome) here because set fast if don't */ 480 { 481 int osetintr = setintr; 482 sigset_t omask = sigblock(sigmask(SIGINT)); 483 484 setintr = 0; 485 #ifdef _PATH_DOTCSHRC 486 (void) srcfile(_PATH_DOTCSHRC, 0, 0); 487 #endif 488 if (!fast && !arginp && !onelflg) 489 dohash(); 490 #ifdef _PATH_DOTLOGIN 491 if (loginsh) 492 (void) srcfile(_PATH_DOTLOGIN, 0, 0); 493 #endif 494 (void) sigsetmask(omask); 495 setintr = osetintr; 496 } 497 (void) srccat(value(STRhome), STRsldotcshrc); 498 499 if (!fast && !arginp && !onelflg && !havhash) 500 dohash(); 501 if (loginsh) 502 (void) srccat(value(STRhome), STRsldotlogin); 503 dosource(loadhist); 504 } 505 506 /* 507 * Now are ready for the -v and -x flags 508 */ 509 if (nverbose) 510 setNS(STRverbose); 511 if (nexececho) 512 setNS(STRecho); 513 514 /* 515 * All the rest of the world is inside this call. The argument to process 516 * indicates whether it should catch "error unwinds". Thus if we are a 517 * interactive shell our call here will never return by being blown past on 518 * an error. 519 */ 520 process(setintr); 521 522 /* 523 * Mop-up. 524 */ 525 if (intty) { 526 if (loginsh) { 527 xprintf("logout\n"); 528 (void) close(SHIN); 529 child = 1; 530 goodbye(); 531 } 532 else { 533 xprintf("exit\n"); 534 } 535 } 536 rechist(); 537 exitstat(); 538 return (0); 539 } 540 541 void 542 untty() 543 { 544 if (tpgrp > 0) { 545 (void) setpgid(0, opgrp); 546 (void) tcsetpgrp(FSHTTY, opgrp); 547 } 548 } 549 550 void 551 importpath(cp) 552 Char *cp; 553 { 554 register int i = 0; 555 register Char *dp; 556 register Char **pv; 557 int c; 558 559 for (dp = cp; *dp; dp++) 560 if (*dp == ':') 561 i++; 562 /* 563 * i+2 where i is the number of colons in the path. There are i+1 564 * directories in the path plus we need room for a zero terminator. 565 */ 566 pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **)); 567 dp = cp; 568 i = 0; 569 if (*dp) 570 for (;;) { 571 if ((c = *dp) == ':' || c == 0) { 572 *dp = 0; 573 pv[i++] = Strsave(*cp ? cp : STRdot); 574 if (c) { 575 cp = dp + 1; 576 *dp = ':'; 577 } 578 else 579 break; 580 } 581 dp++; 582 } 583 pv[i] = 0; 584 set1(STRpath, pv, &shvhed); 585 } 586 587 /* 588 * Source to the file which is the catenation of the argument names. 589 */ 590 static int 591 srccat(cp, dp) 592 Char *cp, *dp; 593 { 594 register Char *ep = Strspl(cp, dp); 595 char *ptr = short2str(ep); 596 597 xfree((ptr_t) ep); 598 return srcfile(ptr, mflag ? 0 : 1, 0); 599 } 600 601 /* 602 * Source to a file putting the file descriptor in a safe place (> 2). 603 */ 604 static int 605 srcfile(f, onlyown, flag) 606 char *f; 607 bool onlyown, flag; 608 { 609 register int unit; 610 611 if ((unit = open(f, O_RDONLY)) == -1) 612 return 0; 613 unit = dmove(unit, -1); 614 615 (void) ioctl(unit, FIOCLEX, NULL); 616 srcunit(unit, onlyown, flag); 617 return 1; 618 } 619 620 /* 621 * Source to a unit. If onlyown it must be our file or our group or 622 * we don't chance it. This occurs on ".cshrc"s and the like. 623 */ 624 int insource; 625 static void 626 srcunit(unit, onlyown, hflg) 627 register int unit; 628 bool onlyown, hflg; 629 { 630 /* We have to push down a lot of state here */ 631 /* All this could go into a structure */ 632 int oSHIN = -1, oldintty = intty, oinsource = insource; 633 struct whyle *oldwhyl = whyles; 634 Char *ogointr = gointr, *oarginp = arginp; 635 Char *oevalp = evalp, **oevalvec = evalvec; 636 int oonelflg = onelflg; 637 bool oenterhist = enterhist; 638 char OHIST = HIST; 639 bool otell = cantell; 640 641 struct Bin saveB; 642 sigset_t omask; 643 jmp_buf oldexit; 644 645 /* The (few) real local variables */ 646 int my_reenter; 647 648 if (unit < 0) 649 return; 650 if (didfds) 651 donefds(); 652 if (onlyown) { 653 struct stat stb; 654 655 if (fstat(unit, &stb) < 0) { 656 (void) close(unit); 657 return; 658 } 659 } 660 661 /* 662 * There is a critical section here while we are pushing down the input 663 * stream since we have stuff in different structures. If we weren't 664 * careful an interrupt could corrupt SHIN's Bin structure and kill the 665 * shell. 666 * 667 * We could avoid the critical region by grouping all the stuff in a single 668 * structure and pointing at it to move it all at once. This is less 669 * efficient globally on many variable references however. 670 */ 671 insource = 1; 672 getexit(oldexit); 673 omask = 0; 674 675 if (setintr) 676 omask = sigblock(sigmask(SIGINT)); 677 /* Setup the new values of the state stuff saved above */ 678 bcopy((char *) &B, (char *) &(saveB), sizeof(B)); 679 fbuf = NULL; 680 fseekp = feobp = fblocks = 0; 681 oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; 682 intty = isatty(SHIN), whyles = 0, gointr = 0; 683 evalvec = 0; 684 evalp = 0; 685 enterhist = hflg; 686 if (enterhist) 687 HIST = '\0'; 688 689 /* 690 * Now if we are allowing commands to be interrupted, we let ourselves be 691 * interrupted. 692 */ 693 if (setintr) 694 (void) sigsetmask(omask); 695 settell(); 696 697 if ((my_reenter = setexit()) == 0) 698 process(0); /* 0 -> blow away on errors */ 699 700 if (setintr) 701 (void) sigsetmask(omask); 702 if (oSHIN >= 0) { 703 register int i; 704 705 /* We made it to the new state... free up its storage */ 706 /* This code could get run twice but xfree doesn't care */ 707 for (i = 0; i < fblocks; i++) 708 xfree((ptr_t) fbuf[i]); 709 xfree((ptr_t) fbuf); 710 711 /* Reset input arena */ 712 bcopy((char *) &(saveB), (char *) &B, sizeof(B)); 713 714 (void) close(SHIN), SHIN = oSHIN; 715 arginp = oarginp, onelflg = oonelflg; 716 evalp = oevalp, evalvec = oevalvec; 717 intty = oldintty, whyles = oldwhyl, gointr = ogointr; 718 if (enterhist) 719 HIST = OHIST; 720 enterhist = oenterhist; 721 cantell = otell; 722 } 723 724 resexit(oldexit); 725 /* 726 * If process reset() (effectively an unwind) then we must also unwind. 727 */ 728 if (my_reenter) 729 stderror(ERR_SILENT); 730 insource = oinsource; 731 } 732 733 void 734 rechist() 735 { 736 Char buf[BUFSIZ]; 737 int fp, ftmp, oldidfds; 738 739 if (!fast) { 740 if (value(STRsavehist)[0] == '\0') 741 return; 742 (void) Strcpy(buf, value(STRhome)); 743 (void) Strcat(buf, STRsldthist); 744 fp = creat(short2str(buf), 0600); 745 if (fp == -1) 746 return; 747 oldidfds = didfds; 748 didfds = 0; 749 ftmp = SHOUT; 750 SHOUT = fp; 751 (void) Strcpy(buf, value(STRsavehist)); 752 dumphist[2] = buf; 753 dohist(dumphist); 754 (void) close(fp); 755 SHOUT = ftmp; 756 didfds = oldidfds; 757 } 758 } 759 760 void 761 goodbye() 762 { 763 rechist(); 764 765 if (loginsh) { 766 (void) signal(SIGQUIT, SIG_IGN); 767 (void) signal(SIGINT, SIG_IGN); 768 (void) signal(SIGTERM, SIG_IGN); 769 setintr = 0; /* No interrupts after "logout" */ 770 if (!(adrof(STRlogout))) 771 set(STRlogout, STRnormal); 772 #ifdef _PATH_DOTLOGOUT 773 (void) srcfile(_PATH_DOTLOGOUT, 0, 0); 774 #endif 775 if (adrof(STRhome)) 776 (void) srccat(value(STRhome), STRsldtlogout); 777 } 778 exitstat(); 779 } 780 781 void 782 exitstat() 783 { 784 785 #ifdef PROF 786 monitor(0); 787 #endif 788 /* 789 * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit 790 * directly because we poke child here. Otherwise we might continue 791 * unwarrantedly (sic). 792 */ 793 child = 1; 794 xexit(getn(value(STRstatus))); 795 } 796 797 /* 798 * in the event of a HUP we want to save the history 799 */ 800 static void 801 phup(sig) 802 int sig; 803 { 804 rechist(); 805 xexit(sig); 806 } 807 808 Char *jobargv[2] = {STRjobs, 0}; 809 810 /* 811 * Catch an interrupt, e.g. during lexical input. 812 * If we are an interactive shell, we reset the interrupt catch 813 * immediately. In any case we drain the shell output, 814 * and finally go through the normal error mechanism, which 815 * gets a chance to make the shell go away. 816 */ 817 /* ARGSUSED */ 818 void 819 pintr(notused) 820 int notused; 821 { 822 pintr1(1); 823 } 824 825 void 826 pintr1(wantnl) 827 bool wantnl; 828 { 829 register Char **v; 830 sigset_t omask; 831 832 omask = sigblock((sigset_t) 0); 833 if (setintr) { 834 (void) sigsetmask(omask & ~sigmask(SIGINT)); 835 if (pjobs) { 836 pjobs = 0; 837 xprintf("\n"); 838 dojobs(jobargv); 839 stderror(ERR_NAME | ERR_INTR); 840 } 841 } 842 (void) sigsetmask(omask & ~sigmask(SIGCHLD)); 843 draino(); 844 (void) endpwent(); 845 846 /* 847 * If we have an active "onintr" then we search for the label. Note that if 848 * one does "onintr -" then we shan't be interruptible so we needn't worry 849 * about that here. 850 */ 851 if (gointr) { 852 search(T_GOTO, 0, gointr); 853 timflg = 0; 854 if (v = pargv) 855 pargv = 0, blkfree(v); 856 if (v = gargv) 857 gargv = 0, blkfree(v); 858 reset(); 859 } 860 else if (intty && wantnl) { 861 (void) putraw('\r'); 862 (void) putraw('\n'); 863 } 864 stderror(ERR_SILENT); 865 } 866 867 /* 868 * Process is the main driving routine for the shell. 869 * It runs all command processing, except for those within { ... } 870 * in expressions (which is run by a routine evalav in sh.exp.c which 871 * is a stripped down process), and `...` evaluation which is run 872 * also by a subset of this code in sh.glob.c in the routine backeval. 873 * 874 * The code here is a little strange because part of it is interruptible 875 * and hence freeing of structures appears to occur when none is necessary 876 * if this is ignored. 877 * 878 * Note that if catch is not set then we will unwind on any error. 879 * If an end-of-file occurs, we return. 880 */ 881 void 882 process(catch) 883 bool catch; 884 { 885 jmp_buf osetexit; 886 struct command *t; 887 888 getexit(osetexit); 889 for (;;) { 890 pendjob(); 891 paraml.next = paraml.prev = ¶ml; 892 paraml.word = STRNULL; 893 t = 0; 894 (void) setexit(); 895 justpr = enterhist; /* execute if not entering history */ 896 897 /* 898 * Interruptible during interactive reads 899 */ 900 if (setintr) 901 (void) sigsetmask(sigblock((sigset_t) 0) & ~sigmask(SIGINT)); 902 903 /* 904 * For the sake of reset() 905 */ 906 freelex(¶ml); 907 freesyn(t); 908 t = 0; 909 910 if (haderr) { 911 if (!catch) { 912 /* unwind */ 913 doneinp = 0; 914 resexit(osetexit); 915 reset(); 916 } 917 haderr = 0; 918 /* 919 * Every error is eventually caught here or the shell dies. It is 920 * at this point that we clean up any left-over open files, by 921 * closing all but a fixed number of pre-defined files. Thus 922 * routines don't have to worry about leaving files open due to 923 * deeper errors... they will get closed here. 924 */ 925 closem(); 926 continue; 927 } 928 if (doneinp) { 929 doneinp = 0; 930 break; 931 } 932 if (chkstop) 933 chkstop--; 934 if (neednote) 935 pnote(); 936 if (intty && prompt && evalvec == 0) { 937 mailchk(); 938 /* 939 * If we are at the end of the input buffer then we are going to 940 * read fresh stuff. Otherwise, we are rereading input and don't 941 * need or want to prompt. 942 */ 943 if (fseekp == feobp) 944 printprompt(); 945 flush(); 946 } 947 if (seterr) { 948 xfree((ptr_t) seterr); 949 seterr = NULL; 950 } 951 952 /* 953 * Echo not only on VERBOSE, but also with history expansion. If there 954 * is a lexical error then we forego history echo. 955 */ 956 if (lex(¶ml) && !seterr && intty || adrof(STRverbose)) { 957 haderr = 1; 958 prlex(¶ml); 959 haderr = 0; 960 } 961 962 /* 963 * The parser may lose space if interrupted. 964 */ 965 if (setintr) 966 (void) sigblock(sigmask(SIGINT)); 967 968 /* 969 * Save input text on the history list if reading in old history, or it 970 * is from the terminal at the top level and not in a loop. 971 * 972 * PWP: entry of items in the history list while in a while loop is done 973 * elsewhere... 974 */ 975 if (enterhist || catch && intty && !whyles) 976 savehist(¶ml); 977 978 /* 979 * Print lexical error messages, except when sourcing history lists. 980 */ 981 if (!enterhist && seterr) 982 stderror(ERR_OLD); 983 984 /* 985 * If had a history command :p modifier then this is as far as we 986 * should go 987 */ 988 if (justpr) 989 reset(); 990 991 alias(¶ml); 992 993 /* 994 * Parse the words of the input into a parse tree. 995 */ 996 t = syntax(paraml.next, ¶ml, 0); 997 if (seterr) 998 stderror(ERR_OLD); 999 1000 execute(t, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); 1001 1002 /* 1003 * Made it! 1004 */ 1005 freelex(¶ml); 1006 freesyn(t); 1007 } 1008 resexit(osetexit); 1009 } 1010 1011 void 1012 dosource(t) 1013 register Char **t; 1014 { 1015 register Char *f; 1016 bool hflg = 0; 1017 Char buf[BUFSIZ]; 1018 1019 t++; 1020 if (*t && eq(*t, STRmh)) { 1021 if (*++t == NULL) 1022 stderror(ERR_NAME | ERR_HFLAG); 1023 hflg++; 1024 } 1025 (void) Strcpy(buf, *t); 1026 f = globone(buf, G_ERROR); 1027 (void) strcpy((char *) buf, short2str(f)); 1028 xfree((ptr_t) f); 1029 if (!srcfile((char *) buf, 0, hflg) && !hflg) 1030 stderror(ERR_SYSTEM, (char *) buf, strerror(errno)); 1031 } 1032 1033 /* 1034 * Check for mail. 1035 * If we are a login shell, then we don't want to tell 1036 * about any mail file unless its been modified 1037 * after the time we started. 1038 * This prevents us from telling the user things he already 1039 * knows, since the login program insists on saying 1040 * "You have mail." 1041 */ 1042 static void 1043 mailchk() 1044 { 1045 register struct varent *v; 1046 register Char **vp; 1047 time_t t; 1048 int intvl, cnt; 1049 struct stat stb; 1050 bool new; 1051 1052 v = adrof(STRmail); 1053 if (v == 0) 1054 return; 1055 (void) time(&t); 1056 vp = v->vec; 1057 cnt = blklen(vp); 1058 intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; 1059 if (intvl < 1) 1060 intvl = 1; 1061 if (chktim + intvl > t) 1062 return; 1063 for (; *vp; vp++) { 1064 if (stat(short2str(*vp), &stb) < 0) 1065 continue; 1066 new = stb.st_mtime > time0.tv_sec; 1067 if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || 1068 (stb.st_atime < chktim && stb.st_mtime < chktim) || 1069 loginsh && !new) 1070 continue; 1071 if (cnt == 1) 1072 xprintf("You have %smail.\n", new ? "new " : ""); 1073 else 1074 xprintf("%s in %s.\n", new ? "New mail" : "Mail", short2str(*vp)); 1075 } 1076 chktim = t; 1077 } 1078 1079 /* 1080 * Extract a home directory from the password file 1081 * The argument points to a buffer where the name of the 1082 * user whose home directory is sought is currently. 1083 * We write the home directory of the user back there. 1084 */ 1085 int 1086 gethdir(home) 1087 Char *home; 1088 { 1089 Char *h; 1090 struct passwd *pw; 1091 1092 /* 1093 * Is it us? 1094 */ 1095 if (*home == '\0') { 1096 if (h = value(STRhome)) { 1097 (void) Strcpy(home, h); 1098 return 0; 1099 } 1100 else 1101 return 1; 1102 } 1103 1104 if (pw = getpwnam(short2str(home))) { 1105 (void) Strcpy(home, str2short(pw->pw_dir)); 1106 return 0; 1107 } 1108 else 1109 return 1; 1110 } 1111 1112 /* 1113 * Move the initial descriptors to their eventual 1114 * resting places, closin all other units. 1115 */ 1116 void 1117 initdesc() 1118 { 1119 1120 didfds = 0; /* 0, 1, 2 aren't set up */ 1121 (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); 1122 (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); 1123 (void) ioctl(SHDIAG = dcopy(2, FSHDIAG), FIOCLEX, NULL); 1124 (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); 1125 closem(); 1126 } 1127 1128 1129 void 1130 #ifdef PROF 1131 done(i) 1132 #else 1133 xexit(i) 1134 #endif 1135 int i; 1136 { 1137 untty(); 1138 _exit(i); 1139 } 1140 1141 static Char ** 1142 defaultpath() 1143 { 1144 char *ptr; 1145 Char **blk, **blkp; 1146 struct stat stb; 1147 1148 blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10); 1149 1150 #define DIRAPPEND(a) \ 1151 if (stat(ptr = a, &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFDIR) \ 1152 *blkp++ = SAVE(ptr) 1153 1154 DIRAPPEND(_PATH_BIN); 1155 DIRAPPEND(_PATH_USRBIN); 1156 1157 #undef DIRAPPEND 1158 1159 *blkp++ = Strsave(STRdot); 1160 *blkp = NULL; 1161 return (blk); 1162 } 1163 1164 void 1165 printprompt() 1166 { 1167 register Char *cp; 1168 1169 if (!whyles) { 1170 for (cp = value(STRprompt); *cp; cp++) 1171 if (*cp == HIST) 1172 xprintf("%d", eventno + 1); 1173 else { 1174 if (*cp == '\\' && cp[1] == HIST) 1175 cp++; 1176 xputchar(*cp | QUOTE); 1177 } 1178 } 1179 else 1180 /* 1181 * Prompt for forward reading loop body content. 1182 */ 1183 xprintf("? "); 1184 flush(); 1185 } 1186