1 /*- 2 * Copyright (c) 1980, 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)csh.c 5.35 (Berkeley) 03/02/92"; 16 #endif /* not lint */ 17 18 #include <sys/types.h> 19 #include <sys/ioctl.h> 20 #include <sys/stat.h> 21 #include <fcntl.h> 22 #include <errno.h> 23 #include <pwd.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <locale.h> 27 #include <unistd.h> 28 #include <vis.h> 29 #if __STDC__ 30 # include <stdarg.h> 31 #else 32 # include <varargs.h> 33 #endif 34 35 #include "csh.h" 36 #include "extern.h" 37 #include "pathnames.h" 38 39 extern bool MapsAreInited; 40 extern bool NLSMapsAreInited; 41 42 /* 43 * C Shell 44 * 45 * Bill Joy, UC Berkeley, California, USA 46 * October 1978, May 1980 47 * 48 * Jim Kulp, IIASA, Laxenburg, Austria 49 * April 1980 50 * 51 * Christos Zoulas, Cornell University 52 * June, 1991 53 */ 54 55 Char *dumphist[] = {STRhistory, STRmh, 0, 0}; 56 Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0}; 57 58 int nofile = 0; 59 bool reenter = 0; 60 bool nverbose = 0; 61 bool nexececho = 0; 62 bool quitit = 0; 63 bool fast = 0; 64 bool batch = 0; 65 bool mflag = 0; 66 bool prompt = 1; 67 bool enterhist = 0; 68 bool tellwhat = 0; 69 70 extern char **environ; 71 72 static int readf __P((void *, char *, int)); 73 static fpos_t seekf __P((void *, fpos_t, int)); 74 static int writef __P((void *, const char *, int)); 75 static int closef __P((void *)); 76 static int srccat __P((Char *, Char *)); 77 static int srcfile __P((char *, bool, bool)); 78 static void phup __P((int)); 79 static void srcunit __P((int, bool, bool)); 80 static void mailchk __P((void)); 81 static Char **defaultpath __P((void)); 82 83 int 84 main(argc, argv) 85 int argc; 86 char **argv; 87 { 88 register Char *cp; 89 register char *tcp; 90 register int f; 91 register char **tempv; 92 struct sigvec osv; 93 94 cshin = stdin; 95 cshout = stdout; 96 csherr = stderr; 97 98 settimes(); /* Immed. estab. timing base */ 99 100 /* 101 * Initialize non constant strings 102 */ 103 #ifdef _PATH_BSHELL 104 STR_BSHELL = SAVE(_PATH_BSHELL); 105 #endif 106 #ifdef _PATH_CSHELL 107 STR_SHELLPATH = SAVE(_PATH_CSHELL); 108 #endif 109 STR_environ = blk2short(environ); 110 environ = short2blk(STR_environ); /* So that we can free it */ 111 STR_WORD_CHARS = SAVE(WORD_CHARS); 112 113 HIST = '!'; 114 HISTSUB = '^'; 115 word_chars = STR_WORD_CHARS; 116 117 tempv = argv; 118 if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ 119 quitit = 1; 120 uid = getuid(); 121 gid = getgid(); 122 /* 123 * We are a login shell if: 1. we were invoked as -<something> and we had 124 * no arguments 2. or we were invoked only with the -l flag 125 */ 126 loginsh = (**tempv == '-' && argc == 1) || 127 (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && 128 tempv[1][2] == '\0'); 129 130 if (loginsh && **tempv != '-') { 131 /* 132 * Mangle the argv space 133 */ 134 tempv[1][0] = '\0'; 135 tempv[1][1] = '\0'; 136 tempv[1] = NULL; 137 for (tcp = *tempv; *tcp++;) 138 continue; 139 for (tcp--; tcp >= *tempv; tcp--) 140 tcp[1] = tcp[0]; 141 *++tcp = '-'; 142 argc--; 143 } 144 if (loginsh) 145 (void) time(&chktim); 146 147 AsciiOnly = 1; 148 #ifdef NLS 149 (void) setlocale(LC_ALL, ""); 150 { 151 int k; 152 153 for (k = 0200; k <= 0377 && !Isprint(k); k++) 154 continue; 155 AsciiOnly = k > 0377; 156 } 157 #else 158 AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL; 159 #endif /* NLS */ 160 161 /* 162 * Move the descriptors to safe places. The variable didfds is 0 while we 163 * have only FSH* to work with. When didfds is true, we have 0,1,2 and 164 * prefer to use these. 165 */ 166 initdesc(); 167 (void) fclose(cshin); 168 (void) fclose(cshout); 169 (void) fclose(csherr); 170 if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef))) 171 exit(1); 172 if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef))) 173 exit(1); 174 if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef))) 175 exit(1); 176 (void) setvbuf(cshin, NULL, _IOLBF, 0); 177 (void) setvbuf(cshout, NULL, _IOLBF, 0); 178 (void) setvbuf(csherr, NULL, _IOLBF, 0); 179 180 181 /* 182 * Initialize the shell variables. ARGV and PROMPT are initialized later. 183 * STATUS is also munged in several places. CHILD is munged when 184 * forking/waiting 185 */ 186 set(STRstatus, Strsave(STR0)); 187 188 if ((tcp = getenv("HOME")) != NULL) 189 cp = SAVE(tcp); 190 else 191 cp = NULL; 192 193 if (cp == NULL) 194 fast = 1; /* No home -> can't read scripts */ 195 else 196 set(STRhome, cp); 197 dinit(cp); /* dinit thinks that HOME == cwd in a login 198 * shell */ 199 /* 200 * Grab other useful things from the environment. Should we grab 201 * everything?? 202 */ 203 if ((tcp = getenv("LOGNAME")) != NULL || 204 (tcp = getenv("USER")) != NULL) 205 set(STRuser, SAVE(tcp)); 206 if ((tcp = getenv("TERM")) != NULL) 207 set(STRterm, SAVE(tcp)); 208 209 /* 210 * Re-initialize path if set in environment 211 */ 212 if ((tcp = getenv("PATH")) == NULL) 213 set1(STRpath, defaultpath(), &shvhed); 214 else 215 importpath(SAVE(tcp)); 216 217 set(STRshell, Strsave(STR_SHELLPATH)); 218 219 doldol = putn((int) getpid()); /* For $$ */ 220 shtemp = Strspl(STRtmpsh, doldol); /* For << */ 221 222 /* 223 * Record the interrupt states from the parent process. If the parent is 224 * non-interruptible our hand must be forced or we (and our children) won't 225 * be either. Our children inherit termination from our parent. We catch it 226 * only if we are the login shell. 227 */ 228 /* parents interruptibility */ 229 (void) sigvec(SIGINT, NULL, &osv); 230 parintr = (void (*) ()) osv.sv_handler; 231 (void) sigvec(SIGTERM, NULL, &osv); 232 parterm = (void (*) ()) osv.sv_handler; 233 234 if (loginsh) { 235 (void) signal(SIGHUP, phup); /* exit processing on HUP */ 236 (void) signal(SIGXCPU, phup); /* ...and on XCPU */ 237 (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ 238 } 239 240 /* 241 * Process the arguments. 242 * 243 * Note that processing of -v/-x is actually delayed till after script 244 * processing. 245 * 246 * We set the first character of our name to be '-' if we are a shell 247 * running interruptible commands. Many programs which examine ps'es 248 * use this to filter such shells out. 249 */ 250 argc--, tempv++; 251 while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { 252 do 253 switch (*tcp++) { 254 255 case 0: /* - Interruptible, no prompt */ 256 prompt = 0; 257 setintr = 1; 258 nofile = 1; 259 break; 260 261 case 'b': /* -b Next arg is input file */ 262 batch = 1; 263 break; 264 265 case 'c': /* -c Command input from arg */ 266 if (argc == 1) 267 xexit(0); 268 argc--, tempv++; 269 arginp = SAVE(tempv[0]); 270 prompt = 0; 271 nofile = 1; 272 break; 273 274 case 'e': /* -e Exit on any error */ 275 exiterr = 1; 276 break; 277 278 case 'f': /* -f Fast start */ 279 fast = 1; 280 break; 281 282 case 'i': /* -i Interactive, even if !intty */ 283 intact = 1; 284 nofile = 1; 285 break; 286 287 case 'm': /* -m read .cshrc (from su) */ 288 mflag = 1; 289 break; 290 291 case 'n': /* -n Don't execute */ 292 noexec = 1; 293 break; 294 295 case 'q': /* -q (Undoc'd) ... die on quit */ 296 quitit = 1; 297 break; 298 299 case 's': /* -s Read from std input */ 300 nofile = 1; 301 break; 302 303 case 't': /* -t Read one line from input */ 304 onelflg = 2; 305 prompt = 0; 306 nofile = 1; 307 break; 308 309 case 'v': /* -v Echo hist expanded input */ 310 nverbose = 1; /* ... later */ 311 break; 312 313 case 'x': /* -x Echo just before execution */ 314 nexececho = 1; /* ... later */ 315 break; 316 317 case 'V': /* -V Echo hist expanded input */ 318 setNS(STRverbose); /* NOW! */ 319 break; 320 321 case 'X': /* -X Echo just before execution */ 322 setNS(STRecho); /* NOW! */ 323 break; 324 325 } while (*tcp); 326 tempv++, argc--; 327 } 328 329 if (quitit) /* With all due haste, for debugging */ 330 (void) signal(SIGQUIT, SIG_DFL); 331 332 /* 333 * Unless prevented by -, -c, -i, -s, or -t, if there are remaining 334 * arguments the first of them is the name of a shell file from which to 335 * read commands. 336 */ 337 if (nofile == 0 && argc > 0) { 338 nofile = open(tempv[0], O_RDONLY); 339 if (nofile < 0) { 340 child = 1; /* So this doesn't return */ 341 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 342 } 343 ffile = SAVE(tempv[0]); 344 /* 345 * Replace FSHIN. Handle /dev/std{in,out,err} specially 346 * since once they are closed we cannot open them again. 347 * In that case we use our own saved descriptors 348 */ 349 if ((SHIN = dmove(nofile, FSHIN)) < 0) 350 switch(nofile) { 351 case 0: 352 SHIN = FSHIN; 353 break; 354 case 1: 355 SHIN = FSHOUT; 356 break; 357 case 2: 358 SHIN = FSHERR; 359 break; 360 default: 361 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 362 break; 363 } 364 (void) ioctl(SHIN, FIOCLEX, NULL); 365 prompt = 0; 366 /* argc not used any more */ tempv++; 367 } 368 369 intty = isatty(SHIN); 370 intty |= intact; 371 if (intty || (intact && isatty(SHOUT))) { 372 if (!batch && (uid != geteuid() || gid != getegid())) { 373 errno = EACCES; 374 child = 1; /* So this doesn't return */ 375 stderror(ERR_SYSTEM, "csh", strerror(errno)); 376 } 377 } 378 /* 379 * Decide whether we should play with signals or not. If we are explicitly 380 * told (via -i, or -) or we are a login shell (arg0 starts with -) or the 381 * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") 382 * Note that in only the login shell is it likely that parent may have set 383 * signals to be ignored 384 */ 385 if (loginsh || intact || intty && isatty(SHOUT)) 386 setintr = 1; 387 settell(); 388 /* 389 * Save the remaining arguments in argv. 390 */ 391 setq(STRargv, blk2short(tempv), &shvhed); 392 393 /* 394 * Set up the prompt. 395 */ 396 if (prompt) { 397 set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); 398 /* that's a meta-questionmark */ 399 set(STRprompt2, Strsave(STRmquestion)); 400 } 401 402 /* 403 * If we are an interactive shell, then start fiddling with the signals; 404 * this is a tricky game. 405 */ 406 shpgrp = getpgrp(); 407 opgrp = tpgrp = -1; 408 if (setintr) { 409 **argv = '-'; 410 if (!quitit) /* Wary! */ 411 (void) signal(SIGQUIT, SIG_IGN); 412 (void) signal(SIGINT, pintr); 413 (void) sigblock(sigmask(SIGINT)); 414 (void) signal(SIGTERM, SIG_IGN); 415 if (quitit == 0 && arginp == 0) { 416 (void) signal(SIGTSTP, SIG_IGN); 417 (void) signal(SIGTTIN, SIG_IGN); 418 (void) signal(SIGTTOU, SIG_IGN); 419 /* 420 * Wait till in foreground, in case someone stupidly runs csh & 421 * dont want to try to grab away the tty. 422 */ 423 if (isatty(FSHERR)) 424 f = FSHERR; 425 else if (isatty(FSHOUT)) 426 f = FSHOUT; 427 else if (isatty(OLDSTD)) 428 f = OLDSTD; 429 else 430 f = -1; 431 retry: 432 if ((tpgrp = tcgetpgrp(f)) != -1) { 433 if (tpgrp != shpgrp) { 434 sig_t old = signal(SIGTTIN, SIG_DFL); 435 (void) kill(0, SIGTTIN); 436 (void) signal(SIGTTIN, old); 437 goto retry; 438 } 439 opgrp = shpgrp; 440 shpgrp = getpid(); 441 tpgrp = shpgrp; 442 /* 443 * Setpgid will fail if we are a session leader and 444 * mypid == mypgrp (POSIX 4.3.3) 445 */ 446 if (opgrp != shpgrp) 447 if (setpgid(0, shpgrp) == -1) 448 goto notty; 449 /* 450 * We do that after we set our process group, to make sure 451 * that the process group belongs to a process in the same 452 * session as the tty (our process and our group) (POSIX 7.2.4) 453 */ 454 if (tcsetpgrp(f, shpgrp) == -1) 455 goto notty; 456 (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); 457 } 458 if (tpgrp == -1) { 459 notty: 460 (void) fprintf(csherr, "Warning: no access to tty (%s).\n", 461 strerror(errno)); 462 (void) fprintf(csherr, "Thus no job control in this shell.\n"); 463 } 464 } 465 } 466 if ((setintr == 0) && (parintr == SIG_DFL)) 467 setintr = 1; 468 (void) signal(SIGCHLD, pchild); /* while signals not ready */ 469 470 /* 471 * Set an exit here in case of an interrupt or error reading the shell 472 * start-up scripts. 473 */ 474 reenter = setexit(); /* PWP */ 475 haderr = 0; /* In case second time through */ 476 if (!fast && reenter == 0) { 477 /* Will have value(STRhome) here because set fast if don't */ 478 { 479 int osetintr = setintr; 480 sig_t oparintr = parintr; 481 sigset_t omask = sigblock(sigmask(SIGINT)); 482 483 setintr = 0; 484 parintr = SIG_IGN; /* Disable onintr */ 485 #ifdef _PATH_DOTCSHRC 486 (void) srcfile(_PATH_DOTCSHRC, 0, 0); 487 #endif 488 if (!fast && !arginp && !onelflg) 489 dohash(NULL, NULL); 490 #ifdef _PATH_DOTLOGIN 491 if (loginsh) 492 (void) srcfile(_PATH_DOTLOGIN, 0, 0); 493 #endif 494 (void) sigsetmask(omask); 495 setintr = osetintr; 496 parintr = oparintr; 497 } 498 (void) srccat(value(STRhome), STRsldotcshrc); 499 500 if (!fast && !arginp && !onelflg && !havhash) 501 dohash(NULL, NULL); 502 /* 503 * Source history before .login so that it is available in .login 504 */ 505 if ((cp = value(STRhistfile)) != STRNULL) 506 loadhist[2] = cp; 507 dosource(loadhist, NULL); 508 if (loginsh) 509 (void) srccat(value(STRhome), STRsldotlogin); 510 } 511 512 /* 513 * Now are ready for the -v and -x flags 514 */ 515 if (nverbose) 516 setNS(STRverbose); 517 if (nexececho) 518 setNS(STRecho); 519 520 /* 521 * All the rest of the world is inside this call. The argument to process 522 * indicates whether it should catch "error unwinds". Thus if we are a 523 * interactive shell our call here will never return by being blown past on 524 * an error. 525 */ 526 process(setintr); 527 528 /* 529 * Mop-up. 530 */ 531 if (intty) { 532 if (loginsh) { 533 (void) fprintf(cshout, "logout\n"); 534 (void) close(SHIN); 535 child = 1; 536 goodbye(); 537 } 538 else { 539 (void) fprintf(cshout, "exit\n"); 540 } 541 } 542 rechist(); 543 exitstat(); 544 return (0); 545 } 546 547 void 548 untty() 549 { 550 if (tpgrp > 0) { 551 (void) setpgid(0, opgrp); 552 (void) tcsetpgrp(FSHTTY, opgrp); 553 } 554 } 555 556 void 557 importpath(cp) 558 Char *cp; 559 { 560 register int i = 0; 561 register Char *dp; 562 register Char **pv; 563 int c; 564 565 for (dp = cp; *dp; dp++) 566 if (*dp == ':') 567 i++; 568 /* 569 * i+2 where i is the number of colons in the path. There are i+1 570 * directories in the path plus we need room for a zero terminator. 571 */ 572 pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **)); 573 dp = cp; 574 i = 0; 575 if (*dp) 576 for (;;) { 577 if ((c = *dp) == ':' || c == 0) { 578 *dp = 0; 579 pv[i++] = Strsave(*cp ? cp : STRdot); 580 if (c) { 581 cp = dp + 1; 582 *dp = ':'; 583 } 584 else 585 break; 586 } 587 dp++; 588 } 589 pv[i] = 0; 590 set1(STRpath, pv, &shvhed); 591 } 592 593 /* 594 * Source to the file which is the catenation of the argument names. 595 */ 596 static int 597 srccat(cp, dp) 598 Char *cp, *dp; 599 { 600 register Char *ep = Strspl(cp, dp); 601 char *ptr = short2str(ep); 602 603 xfree((ptr_t) ep); 604 return srcfile(ptr, mflag ? 0 : 1, 0); 605 } 606 607 /* 608 * Source to a file putting the file descriptor in a safe place (> 2). 609 */ 610 static int 611 srcfile(f, onlyown, flag) 612 char *f; 613 bool onlyown, flag; 614 { 615 register int unit; 616 617 if ((unit = open(f, O_RDONLY)) == -1) 618 return 0; 619 unit = dmove(unit, -1); 620 621 (void) ioctl(unit, FIOCLEX, NULL); 622 srcunit(unit, onlyown, flag); 623 return 1; 624 } 625 626 /* 627 * Source to a unit. If onlyown it must be our file or our group or 628 * we don't chance it. This occurs on ".cshrc"s and the like. 629 */ 630 int insource; 631 static void 632 srcunit(unit, onlyown, hflg) 633 register int unit; 634 bool onlyown, hflg; 635 { 636 /* We have to push down a lot of state here */ 637 /* All this could go into a structure */ 638 int oSHIN = -1, oldintty = intty, oinsource = insource; 639 struct whyle *oldwhyl = whyles; 640 Char *ogointr = gointr, *oarginp = arginp; 641 Char *oevalp = evalp, **oevalvec = evalvec; 642 int oonelflg = onelflg; 643 bool oenterhist = enterhist; 644 char OHIST = HIST; 645 bool otell = cantell; 646 647 struct Bin saveB; 648 volatile sigset_t omask; 649 jmp_buf oldexit; 650 651 /* The (few) real local variables */ 652 int my_reenter; 653 654 if (unit < 0) 655 return; 656 if (didfds) 657 donefds(); 658 if (onlyown) { 659 struct stat stb; 660 661 if (fstat(unit, &stb) < 0) { 662 (void) close(unit); 663 return; 664 } 665 } 666 667 /* 668 * There is a critical section here while we are pushing down the input 669 * stream since we have stuff in different structures. If we weren't 670 * careful an interrupt could corrupt SHIN's Bin structure and kill the 671 * shell. 672 * 673 * We could avoid the critical region by grouping all the stuff in a single 674 * structure and pointing at it to move it all at once. This is less 675 * efficient globally on many variable references however. 676 */ 677 insource = 1; 678 getexit(oldexit); 679 omask = 0; 680 681 if (setintr) 682 omask = sigblock(sigmask(SIGINT)); 683 /* Setup the new values of the state stuff saved above */ 684 bcopy((char *) &B, (char *) &(saveB), sizeof(B)); 685 fbuf = NULL; 686 fseekp = feobp = fblocks = 0; 687 oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; 688 intty = isatty(SHIN), whyles = 0, gointr = 0; 689 evalvec = 0; 690 evalp = 0; 691 enterhist = hflg; 692 if (enterhist) 693 HIST = '\0'; 694 695 /* 696 * Now if we are allowing commands to be interrupted, we let ourselves be 697 * interrupted. 698 */ 699 if (setintr) 700 (void) sigsetmask(omask); 701 settell(); 702 703 if ((my_reenter = setexit()) == 0) 704 process(0); /* 0 -> blow away on errors */ 705 706 if (setintr) 707 (void) sigsetmask(omask); 708 if (oSHIN >= 0) { 709 register int i; 710 711 /* We made it to the new state... free up its storage */ 712 /* This code could get run twice but xfree doesn't care */ 713 for (i = 0; i < fblocks; i++) 714 xfree((ptr_t) fbuf[i]); 715 xfree((ptr_t) fbuf); 716 717 /* Reset input arena */ 718 bcopy((char *) &(saveB), (char *) &B, sizeof(B)); 719 720 (void) close(SHIN), SHIN = oSHIN; 721 arginp = oarginp, onelflg = oonelflg; 722 evalp = oevalp, evalvec = oevalvec; 723 intty = oldintty, whyles = oldwhyl, gointr = ogointr; 724 if (enterhist) 725 HIST = OHIST; 726 enterhist = oenterhist; 727 cantell = otell; 728 } 729 730 resexit(oldexit); 731 /* 732 * If process reset() (effectively an unwind) then we must also unwind. 733 */ 734 if (my_reenter) 735 stderror(ERR_SILENT); 736 insource = oinsource; 737 } 738 739 void 740 rechist() 741 { 742 Char buf[BUFSIZ], hbuf[BUFSIZ], *hfile; 743 int fp, ftmp, oldidfds; 744 struct varent *shist; 745 746 if (!fast) { 747 /* 748 * If $savehist is just set, we use the value of $history 749 * else we use the value in $savehist 750 */ 751 if (shist = adrof(STRsavehist)) { 752 if (shist->vec[0][0] != '\0') 753 (void) Strcpy(hbuf, shist->vec[0]); 754 else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0') 755 (void) Strcpy(hbuf, shist->vec[0]); 756 else 757 return; 758 } 759 else 760 return; 761 762 if ((hfile = value(STRhistfile)) == STRNULL) { 763 hfile = Strcpy(buf, value(STRhome)); 764 (void) Strcat(buf, STRsldthist); 765 } 766 767 if ((fp = creat(short2str(hfile), 0600)) == -1) 768 return; 769 770 oldidfds = didfds; 771 didfds = 0; 772 ftmp = SHOUT; 773 SHOUT = fp; 774 dumphist[2] = hbuf; 775 dohist(dumphist, NULL); 776 SHOUT = ftmp; 777 (void) close(fp); 778 didfds = oldidfds; 779 } 780 } 781 782 void 783 goodbye() 784 { 785 rechist(); 786 787 if (loginsh) { 788 (void) signal(SIGQUIT, SIG_IGN); 789 (void) signal(SIGINT, SIG_IGN); 790 (void) signal(SIGTERM, SIG_IGN); 791 setintr = 0; /* No interrupts after "logout" */ 792 if (!(adrof(STRlogout))) 793 set(STRlogout, STRnormal); 794 #ifdef _PATH_DOTLOGOUT 795 (void) srcfile(_PATH_DOTLOGOUT, 0, 0); 796 #endif 797 if (adrof(STRhome)) 798 (void) srccat(value(STRhome), STRsldtlogout); 799 } 800 exitstat(); 801 } 802 803 void 804 exitstat() 805 { 806 Char *s; 807 #ifdef PROF 808 monitor(0); 809 #endif 810 /* 811 * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit 812 * directly because we poke child here. Otherwise we might continue 813 * unwarrantedly (sic). 814 */ 815 child = 1; 816 s = value(STRstatus); 817 xexit(s ? getn(s) : 0); 818 } 819 820 /* 821 * in the event of a HUP we want to save the history 822 */ 823 static void 824 phup(sig) 825 int sig; 826 { 827 rechist(); 828 xexit(sig); 829 } 830 831 Char *jobargv[2] = {STRjobs, 0}; 832 833 /* 834 * Catch an interrupt, e.g. during lexical input. 835 * If we are an interactive shell, we reset the interrupt catch 836 * immediately. In any case we drain the shell output, 837 * and finally go through the normal error mechanism, which 838 * gets a chance to make the shell go away. 839 */ 840 /* ARGSUSED */ 841 void 842 pintr(notused) 843 int notused; 844 { 845 pintr1(1); 846 } 847 848 void 849 pintr1(wantnl) 850 bool wantnl; 851 { 852 Char **v; 853 sigset_t omask; 854 855 omask = sigblock((sigset_t) 0); 856 if (setintr) { 857 (void) sigsetmask(omask & ~sigmask(SIGINT)); 858 if (pjobs) { 859 pjobs = 0; 860 (void) fprintf(cshout, "\n"); 861 dojobs(jobargv, NULL); 862 stderror(ERR_NAME | ERR_INTR); 863 } 864 } 865 (void) sigsetmask(omask & ~sigmask(SIGCHLD)); 866 (void) fpurge(cshout); 867 (void) endpwent(); 868 869 /* 870 * If we have an active "onintr" then we search for the label. Note that if 871 * one does "onintr -" then we shan't be interruptible so we needn't worry 872 * about that here. 873 */ 874 if (gointr) { 875 gotolab(gointr); 876 timflg = 0; 877 if (v = pargv) 878 pargv = 0, blkfree(v); 879 if (v = gargv) 880 gargv = 0, blkfree(v); 881 reset(); 882 } 883 else if (intty && wantnl) { 884 (void) fputc('\r', cshout); 885 (void) fputc('\n', cshout); 886 } 887 stderror(ERR_SILENT); 888 } 889 890 /* 891 * Process is the main driving routine for the shell. 892 * It runs all command processing, except for those within { ... } 893 * in expressions (which is run by a routine evalav in sh.exp.c which 894 * is a stripped down process), and `...` evaluation which is run 895 * also by a subset of this code in sh.glob.c in the routine backeval. 896 * 897 * The code here is a little strange because part of it is interruptible 898 * and hence freeing of structures appears to occur when none is necessary 899 * if this is ignored. 900 * 901 * Note that if catch is not set then we will unwind on any error. 902 * If an end-of-file occurs, we return. 903 */ 904 static struct command *savet = NULL; 905 void 906 process(catch) 907 bool catch; 908 { 909 jmp_buf osetexit; 910 struct command *t = savet; 911 912 savet = NULL; 913 getexit(osetexit); 914 for (;;) { 915 pendjob(); 916 paraml.next = paraml.prev = ¶ml; 917 paraml.word = STRNULL; 918 (void) setexit(); 919 justpr = enterhist; /* execute if not entering history */ 920 921 /* 922 * Interruptible during interactive reads 923 */ 924 if (setintr) 925 (void) sigsetmask(sigblock((sigset_t) 0) & ~sigmask(SIGINT)); 926 927 /* 928 * For the sake of reset() 929 */ 930 freelex(¶ml); 931 if (savet) 932 freesyn(savet), savet = NULL; 933 934 if (haderr) { 935 if (!catch) { 936 /* unwind */ 937 doneinp = 0; 938 resexit(osetexit); 939 savet = t; 940 reset(); 941 } 942 haderr = 0; 943 /* 944 * Every error is eventually caught here or the shell dies. It is 945 * at this point that we clean up any left-over open files, by 946 * closing all but a fixed number of pre-defined files. Thus 947 * routines don't have to worry about leaving files open due to 948 * deeper errors... they will get closed here. 949 */ 950 closem(); 951 continue; 952 } 953 if (doneinp) { 954 doneinp = 0; 955 break; 956 } 957 if (chkstop) 958 chkstop--; 959 if (neednote) 960 pnote(); 961 if (intty && prompt && evalvec == 0) { 962 mailchk(); 963 /* 964 * If we are at the end of the input buffer then we are going to 965 * read fresh stuff. Otherwise, we are rereading input and don't 966 * need or want to prompt. 967 */ 968 if (aret == F_SEEK && fseekp == feobp) 969 printprompt(); 970 (void) fflush(cshout); 971 } 972 if (seterr) { 973 xfree((ptr_t) seterr); 974 seterr = NULL; 975 } 976 977 /* 978 * Echo not only on VERBOSE, but also with history expansion. If there 979 * is a lexical error then we forego history echo. 980 */ 981 if (lex(¶ml) && !seterr && intty || adrof(STRverbose)) { 982 prlex(csherr, ¶ml); 983 } 984 985 /* 986 * The parser may lose space if interrupted. 987 */ 988 if (setintr) 989 (void) sigblock(sigmask(SIGINT)); 990 991 /* 992 * Save input text on the history list if reading in old history, or it 993 * is from the terminal at the top level and not in a loop. 994 * 995 * PWP: entry of items in the history list while in a while loop is done 996 * elsewhere... 997 */ 998 if (enterhist || catch && intty && !whyles) 999 savehist(¶ml); 1000 1001 /* 1002 * Print lexical error messages, except when sourcing history lists. 1003 */ 1004 if (!enterhist && seterr) 1005 stderror(ERR_OLD); 1006 1007 /* 1008 * If had a history command :p modifier then this is as far as we 1009 * should go 1010 */ 1011 if (justpr) 1012 reset(); 1013 1014 alias(¶ml); 1015 1016 /* 1017 * Parse the words of the input into a parse tree. 1018 */ 1019 savet = syntax(paraml.next, ¶ml, 0); 1020 if (seterr) 1021 stderror(ERR_OLD); 1022 1023 execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); 1024 1025 /* 1026 * Made it! 1027 */ 1028 freelex(¶ml); 1029 freesyn((struct command *) savet), savet = NULL; 1030 } 1031 resexit(osetexit); 1032 savet = t; 1033 } 1034 1035 void 1036 /*ARGSUSED*/ 1037 dosource(v, t) 1038 Char **v; 1039 struct command *t; 1040 1041 { 1042 register Char *f; 1043 bool hflg = 0; 1044 Char buf[BUFSIZ]; 1045 1046 v++; 1047 if (*v && eq(*v, STRmh)) { 1048 if (*++v == NULL) 1049 stderror(ERR_NAME | ERR_HFLAG); 1050 hflg++; 1051 } 1052 (void) Strcpy(buf, *v); 1053 f = globone(buf, G_ERROR); 1054 (void) strcpy((char *) buf, short2str(f)); 1055 xfree((ptr_t) f); 1056 if (!srcfile((char *) buf, 0, hflg) && !hflg) 1057 stderror(ERR_SYSTEM, (char *) buf, strerror(errno)); 1058 } 1059 1060 /* 1061 * Check for mail. 1062 * If we are a login shell, then we don't want to tell 1063 * about any mail file unless its been modified 1064 * after the time we started. 1065 * This prevents us from telling the user things he already 1066 * knows, since the login program insists on saying 1067 * "You have mail." 1068 */ 1069 static void 1070 mailchk() 1071 { 1072 register struct varent *v; 1073 register Char **vp; 1074 time_t t; 1075 int intvl, cnt; 1076 struct stat stb; 1077 bool new; 1078 1079 v = adrof(STRmail); 1080 if (v == 0) 1081 return; 1082 (void) time(&t); 1083 vp = v->vec; 1084 cnt = blklen(vp); 1085 intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; 1086 if (intvl < 1) 1087 intvl = 1; 1088 if (chktim + intvl > t) 1089 return; 1090 for (; *vp; vp++) { 1091 if (stat(short2str(*vp), &stb) < 0) 1092 continue; 1093 new = stb.st_mtime > time0.tv_sec; 1094 if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || 1095 (stb.st_atime < chktim && stb.st_mtime < chktim) || 1096 loginsh && !new) 1097 continue; 1098 if (cnt == 1) 1099 (void) fprintf(cshout, "You have %smail.\n", new ? "new " : ""); 1100 else 1101 (void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail", 1102 vis_str(*vp)); 1103 } 1104 chktim = t; 1105 } 1106 1107 /* 1108 * Extract a home directory from the password file 1109 * The argument points to a buffer where the name of the 1110 * user whose home directory is sought is currently. 1111 * We write the home directory of the user back there. 1112 */ 1113 int 1114 gethdir(home) 1115 Char *home; 1116 { 1117 Char *h; 1118 struct passwd *pw; 1119 1120 /* 1121 * Is it us? 1122 */ 1123 if (*home == '\0') { 1124 if (h = value(STRhome)) { 1125 (void) Strcpy(home, h); 1126 return 0; 1127 } 1128 else 1129 return 1; 1130 } 1131 1132 if (pw = getpwnam(short2str(home))) { 1133 (void) Strcpy(home, str2short(pw->pw_dir)); 1134 return 0; 1135 } 1136 else 1137 return 1; 1138 } 1139 1140 /* 1141 * When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17 1142 * We also check if the shell has already changed the decriptor to point to 1143 * 0, 1, 2 when didfds is set. 1144 */ 1145 #define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0)) 1146 1147 static int 1148 readf(oreo, buf, siz) 1149 void *oreo; 1150 char *buf; 1151 int siz; 1152 { 1153 return read(DESC(oreo), buf, siz); 1154 } 1155 1156 1157 static int 1158 writef(oreo, buf, siz) 1159 void *oreo; 1160 const char *buf; 1161 int siz; 1162 { 1163 return write(DESC(oreo), buf, siz); 1164 } 1165 1166 static fpos_t 1167 seekf(oreo, off, whence) 1168 void *oreo; 1169 fpos_t off; 1170 int whence; 1171 { 1172 return lseek(DESC(oreo), off, whence); 1173 } 1174 1175 1176 static int 1177 closef(oreo) 1178 void *oreo; 1179 { 1180 return close(DESC(oreo)); 1181 } 1182 1183 1184 /* 1185 * Print the visible version of a string. 1186 */ 1187 int 1188 vis_fputc(ch, fp) 1189 int ch; 1190 FILE *fp; 1191 { 1192 char uenc[5]; /* 4 + NULL */ 1193 1194 if (ch & QUOTE) 1195 return fputc(ch & TRIM, fp); 1196 /* 1197 * XXX: When we are in AsciiOnly we want all characters >= 0200 to 1198 * be encoded, but currently there is no way in vis to do that. 1199 */ 1200 (void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0); 1201 return fputs(uenc, fp); 1202 } 1203 1204 /* 1205 * Move the initial descriptors to their eventual 1206 * resting places, closin all other units. 1207 */ 1208 void 1209 initdesc() 1210 { 1211 1212 didfds = 0; /* 0, 1, 2 aren't set up */ 1213 (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); 1214 (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); 1215 (void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL); 1216 (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); 1217 closem(); 1218 } 1219 1220 1221 void 1222 #ifdef PROF 1223 done(i) 1224 #else 1225 xexit(i) 1226 #endif 1227 int i; 1228 { 1229 untty(); 1230 _exit(i); 1231 } 1232 1233 static Char ** 1234 defaultpath() 1235 { 1236 char *ptr; 1237 Char **blk, **blkp; 1238 struct stat stb; 1239 1240 blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10); 1241 1242 #define DIRAPPEND(a) \ 1243 if (stat(ptr = a, &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFDIR) \ 1244 *blkp++ = SAVE(ptr) 1245 1246 DIRAPPEND(_PATH_BIN); 1247 DIRAPPEND(_PATH_USRBIN); 1248 1249 #undef DIRAPPEND 1250 1251 *blkp++ = Strsave(STRdot); 1252 *blkp = NULL; 1253 return (blk); 1254 } 1255 1256 void 1257 printprompt() 1258 { 1259 register Char *cp; 1260 1261 if (!whyles) { 1262 for (cp = value(STRprompt); *cp; cp++) 1263 if (*cp == HIST) 1264 (void) fprintf(cshout, "%d", eventno + 1); 1265 else { 1266 if (*cp == '\\' && cp[1] == HIST) 1267 cp++; 1268 (void) vis_fputc(*cp | QUOTE, cshout); 1269 } 1270 } 1271 else 1272 /* 1273 * Prompt for forward reading loop body content. 1274 */ 1275 (void) fprintf(cshout, "? "); 1276 (void) fflush(cshout); 1277 } 1278