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