1 /*- 2 * Copyright (c) 1980, 1991, 1993 3 * The Regents of the University of California. 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 static char copyright[] = 36 "@(#) Copyright (c) 1980, 1991, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)csh.c 8.2 (Berkeley) 10/12/93";*/ 42 static char *rcsid = "$Id: csh.c,v 1.7 1994/09/21 00:10:35 mycroft 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 #include <vis.h> 56 #if __STDC__ 57 # include <stdarg.h> 58 #else 59 # include <varargs.h> 60 #endif 61 62 #include "csh.h" 63 #include "proc.h" 64 #include "extern.h" 65 #include "pathnames.h" 66 67 extern bool MapsAreInited; 68 extern bool NLSMapsAreInited; 69 70 /* 71 * C Shell 72 * 73 * Bill Joy, UC Berkeley, California, USA 74 * October 1978, May 1980 75 * 76 * Jim Kulp, IIASA, Laxenburg, Austria 77 * April 1980 78 * 79 * Christos Zoulas, Cornell University 80 * June, 1991 81 */ 82 83 Char *dumphist[] = {STRhistory, STRmh, 0, 0}; 84 Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0}; 85 86 int nofile = 0; 87 bool reenter = 0; 88 bool nverbose = 0; 89 bool nexececho = 0; 90 bool quitit = 0; 91 bool fast = 0; 92 bool batch = 0; 93 bool mflag = 0; 94 bool prompt = 1; 95 bool enterhist = 0; 96 bool tellwhat = 0; 97 98 extern char **environ; 99 100 static int readf __P((void *, char *, int)); 101 static fpos_t seekf __P((void *, fpos_t, int)); 102 static int writef __P((void *, const char *, int)); 103 static int closef __P((void *)); 104 static int srccat __P((Char *, Char *)); 105 static int srcfile __P((char *, bool, bool)); 106 static void phup __P((int)); 107 static void srcunit __P((int, bool, bool)); 108 static void mailchk __P((void)); 109 static Char **defaultpath __P((void)); 110 111 int 112 main(argc, argv) 113 int argc; 114 char **argv; 115 { 116 register Char *cp; 117 register char *tcp; 118 register int f; 119 register char **tempv; 120 struct sigvec osv; 121 122 cshin = stdin; 123 cshout = stdout; 124 csherr = stderr; 125 126 settimes(); /* Immed. estab. timing base */ 127 128 /* 129 * Initialize non constant strings 130 */ 131 #ifdef _PATH_BSHELL 132 STR_BSHELL = SAVE(_PATH_BSHELL); 133 #endif 134 #ifdef _PATH_CSHELL 135 STR_SHELLPATH = SAVE(_PATH_CSHELL); 136 #endif 137 STR_environ = blk2short(environ); 138 environ = short2blk(STR_environ); /* So that we can free it */ 139 STR_WORD_CHARS = SAVE(WORD_CHARS); 140 141 HIST = '!'; 142 HISTSUB = '^'; 143 word_chars = STR_WORD_CHARS; 144 145 tempv = argv; 146 if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ 147 quitit = 1; 148 uid = getuid(); 149 gid = getgid(); 150 euid = geteuid(); 151 egid = getegid(); 152 /* 153 * We are a login shell if: 1. we were invoked as -<something> and we had 154 * no arguments 2. or we were invoked only with the -l flag 155 */ 156 loginsh = (**tempv == '-' && argc == 1) || 157 (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && 158 tempv[1][2] == '\0'); 159 160 if (loginsh && **tempv != '-') { 161 /* 162 * Mangle the argv space 163 */ 164 tempv[1][0] = '\0'; 165 tempv[1][1] = '\0'; 166 tempv[1] = NULL; 167 for (tcp = *tempv; *tcp++;) 168 continue; 169 for (tcp--; tcp >= *tempv; tcp--) 170 tcp[1] = tcp[0]; 171 *++tcp = '-'; 172 argc--; 173 } 174 if (loginsh) 175 (void) time(&chktim); 176 177 AsciiOnly = 1; 178 #ifdef NLS 179 (void) setlocale(LC_ALL, ""); 180 { 181 int k; 182 183 for (k = 0200; k <= 0377 && !Isprint(k); k++) 184 continue; 185 AsciiOnly = k > 0377; 186 } 187 #else 188 AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL; 189 #endif /* NLS */ 190 191 /* 192 * Move the descriptors to safe places. The variable didfds is 0 while we 193 * have only FSH* to work with. When didfds is true, we have 0,1,2 and 194 * prefer to use these. 195 */ 196 initdesc(); 197 /* 198 * XXX: This is to keep programs that use stdio happy. 199 * what we really want is freunopen() .... 200 * Closing cshin cshout and csherr (which are really stdin stdout 201 * and stderr at this point and then reopening them in the same order 202 * gives us again stdin == cshin stdout == cshout and stderr == csherr. 203 * If that was not the case builtins like printf that use stdio 204 * would break. But in any case we could fix that with memcpy and 205 * a bit of pointer manipulation... 206 * Fortunately this is not needed under the current implementation 207 * of stdio. 208 */ 209 (void) fclose(cshin); 210 (void) fclose(cshout); 211 (void) fclose(csherr); 212 if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef))) 213 exit(1); 214 if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef))) 215 exit(1); 216 if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef))) 217 exit(1); 218 (void) setvbuf(cshin, NULL, _IOLBF, 0); 219 (void) setvbuf(cshout, NULL, _IOLBF, 0); 220 (void) setvbuf(csherr, NULL, _IOLBF, 0); 221 222 /* 223 * Initialize the shell variables. ARGV and PROMPT are initialized later. 224 * STATUS is also munged in several places. CHILD is munged when 225 * forking/waiting 226 */ 227 set(STRstatus, Strsave(STR0)); 228 229 if ((tcp = getenv("HOME")) != NULL) 230 cp = SAVE(tcp); 231 else 232 cp = NULL; 233 234 if (cp == NULL) 235 fast = 1; /* No home -> can't read scripts */ 236 else 237 set(STRhome, cp); 238 dinit(cp); /* dinit thinks that HOME == cwd in a login 239 * shell */ 240 /* 241 * Grab other useful things from the environment. Should we grab 242 * everything?? 243 */ 244 if ((tcp = getenv("LOGNAME")) != NULL || 245 (tcp = getenv("USER")) != NULL) 246 set(STRuser, SAVE(tcp)); 247 if ((tcp = getenv("TERM")) != NULL) 248 set(STRterm, SAVE(tcp)); 249 250 /* 251 * Re-initialize path if set in environment 252 */ 253 if ((tcp = getenv("PATH")) == NULL) 254 set1(STRpath, defaultpath(), &shvhed); 255 else 256 importpath(SAVE(tcp)); 257 258 set(STRshell, Strsave(STR_SHELLPATH)); 259 260 doldol = putn((int) getpid()); /* For $$ */ 261 shtemp = Strspl(STRtmpsh, doldol); /* For << */ 262 263 /* 264 * Record the interrupt states from the parent process. If the parent is 265 * non-interruptible our hand must be forced or we (and our children) won't 266 * be either. Our children inherit termination from our parent. We catch it 267 * only if we are the login shell. 268 */ 269 /* parents interruptibility */ 270 (void) sigvec(SIGINT, NULL, &osv); 271 parintr = (void (*) ()) osv.sv_handler; 272 (void) sigvec(SIGTERM, NULL, &osv); 273 parterm = (void (*) ()) osv.sv_handler; 274 275 /* catch these all, login shell or not */ 276 (void) signal(SIGHUP, phup); /* exit processing on HUP */ 277 (void) signal(SIGXCPU, phup); /* ...and on XCPU */ 278 (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ 279 280 /* 281 * Process the arguments. 282 * 283 * Note that processing of -v/-x is actually delayed till after script 284 * processing. 285 * 286 * We set the first character of our name to be '-' if we are a shell 287 * running interruptible commands. Many programs which examine ps'es 288 * use this to filter such shells out. 289 */ 290 argc--, tempv++; 291 while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { 292 do 293 switch (*tcp++) { 294 295 case 0: /* - Interruptible, no prompt */ 296 prompt = 0; 297 setintr = 1; 298 nofile = 1; 299 break; 300 301 case 'b': /* -b Next arg is input file */ 302 batch = 1; 303 break; 304 305 case 'c': /* -c Command input from arg */ 306 if (argc == 1) 307 xexit(0); 308 argc--, tempv++; 309 arginp = SAVE(tempv[0]); 310 prompt = 0; 311 nofile = 1; 312 break; 313 314 case 'e': /* -e Exit on any error */ 315 exiterr = 1; 316 break; 317 318 case 'f': /* -f Fast start */ 319 fast = 1; 320 break; 321 322 case 'i': /* -i Interactive, even if !intty */ 323 intact = 1; 324 nofile = 1; 325 break; 326 327 case 'm': /* -m read .cshrc (from su) */ 328 mflag = 1; 329 break; 330 331 case 'n': /* -n Don't execute */ 332 noexec = 1; 333 break; 334 335 case 'q': /* -q (Undoc'd) ... die on quit */ 336 quitit = 1; 337 break; 338 339 case 's': /* -s Read from std input */ 340 nofile = 1; 341 break; 342 343 case 't': /* -t Read one line from input */ 344 onelflg = 2; 345 prompt = 0; 346 nofile = 1; 347 break; 348 349 case 'v': /* -v Echo hist expanded input */ 350 nverbose = 1; /* ... later */ 351 break; 352 353 case 'x': /* -x Echo just before execution */ 354 nexececho = 1; /* ... later */ 355 break; 356 357 case 'V': /* -V Echo hist expanded input */ 358 setNS(STRverbose); /* NOW! */ 359 break; 360 361 case 'X': /* -X Echo just before execution */ 362 setNS(STRecho); /* NOW! */ 363 break; 364 365 } while (*tcp); 366 tempv++, argc--; 367 } 368 369 if (quitit) /* With all due haste, for debugging */ 370 (void) signal(SIGQUIT, SIG_DFL); 371 372 /* 373 * Unless prevented by -, -c, -i, -s, or -t, if there are remaining 374 * arguments the first of them is the name of a shell file from which to 375 * read commands. 376 */ 377 if (nofile == 0 && argc > 0) { 378 nofile = open(tempv[0], O_RDONLY); 379 if (nofile < 0) { 380 child = 1; /* So this doesn't return */ 381 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 382 } 383 ffile = SAVE(tempv[0]); 384 /* 385 * Replace FSHIN. Handle /dev/std{in,out,err} specially 386 * since once they are closed we cannot open them again. 387 * In that case we use our own saved descriptors 388 */ 389 if ((SHIN = dmove(nofile, FSHIN)) < 0) 390 switch(nofile) { 391 case 0: 392 SHIN = FSHIN; 393 break; 394 case 1: 395 SHIN = FSHOUT; 396 break; 397 case 2: 398 SHIN = FSHERR; 399 break; 400 default: 401 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 402 break; 403 } 404 (void) ioctl(SHIN, FIOCLEX, NULL); 405 prompt = 0; 406 /* argc not used any more */ tempv++; 407 } 408 409 intty = isatty(SHIN); 410 intty |= intact; 411 if (intty || (intact && isatty(SHOUT))) { 412 if (!batch && (uid != euid || gid != egid)) { 413 errno = EACCES; 414 child = 1; /* So this doesn't return */ 415 stderror(ERR_SYSTEM, "csh", strerror(errno)); 416 } 417 } 418 /* 419 * Decide whether we should play with signals or not. If we are explicitly 420 * told (via -i, or -) or we are a login shell (arg0 starts with -) or the 421 * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") 422 * Note that in only the login shell is it likely that parent may have set 423 * signals to be ignored 424 */ 425 if (loginsh || intact || (intty && isatty(SHOUT))) 426 setintr = 1; 427 settell(); 428 /* 429 * Save the remaining arguments in argv. 430 */ 431 setq(STRargv, blk2short(tempv), &shvhed); 432 433 /* 434 * Set up the prompt. 435 */ 436 if (prompt) { 437 set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); 438 /* that's a meta-questionmark */ 439 set(STRprompt2, Strsave(STRmquestion)); 440 } 441 442 /* 443 * If we are an interactive shell, then start fiddling with the signals; 444 * this is a tricky game. 445 */ 446 shpgrp = getpgrp(); 447 opgrp = tpgrp = -1; 448 if (setintr) { 449 **argv = '-'; 450 if (!quitit) /* Wary! */ 451 (void) signal(SIGQUIT, SIG_IGN); 452 (void) signal(SIGINT, pintr); 453 (void) sigblock(sigmask(SIGINT)); 454 (void) signal(SIGTERM, SIG_IGN); 455 if (quitit == 0 && arginp == 0) { 456 (void) signal(SIGTSTP, SIG_IGN); 457 (void) signal(SIGTTIN, SIG_IGN); 458 (void) signal(SIGTTOU, SIG_IGN); 459 /* 460 * Wait till in foreground, in case someone stupidly runs csh & 461 * dont want to try to grab away the tty. 462 */ 463 if (isatty(FSHERR)) 464 f = FSHERR; 465 else if (isatty(FSHOUT)) 466 f = FSHOUT; 467 else if (isatty(OLDSTD)) 468 f = OLDSTD; 469 else 470 f = -1; 471 retry: 472 if ((tpgrp = tcgetpgrp(f)) != -1) { 473 if (tpgrp != shpgrp) { 474 sig_t old = signal(SIGTTIN, SIG_DFL); 475 (void) kill(0, SIGTTIN); 476 (void) signal(SIGTTIN, old); 477 goto retry; 478 } 479 opgrp = shpgrp; 480 shpgrp = getpid(); 481 tpgrp = shpgrp; 482 /* 483 * Setpgid will fail if we are a session leader and 484 * mypid == mypgrp (POSIX 4.3.3) 485 */ 486 if (opgrp != shpgrp) 487 if (setpgid(0, shpgrp) == -1) 488 goto notty; 489 /* 490 * We do that after we set our process group, to make sure 491 * that the process group belongs to a process in the same 492 * session as the tty (our process and our group) (POSIX 7.2.4) 493 */ 494 if (tcsetpgrp(f, shpgrp) == -1) 495 goto notty; 496 (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); 497 } 498 if (tpgrp == -1) { 499 notty: 500 (void) fprintf(csherr, "Warning: no access to tty (%s).\n", 501 strerror(errno)); 502 (void) fprintf(csherr, "Thus no job control in this shell.\n"); 503 } 504 } 505 } 506 if ((setintr == 0) && (parintr == SIG_DFL)) 507 setintr = 1; 508 (void) signal(SIGCHLD, pchild); /* while signals not ready */ 509 510 /* 511 * Set an exit here in case of an interrupt or error reading the shell 512 * start-up scripts. 513 */ 514 reenter = setexit(); /* PWP */ 515 haderr = 0; /* In case second time through */ 516 if (!fast && reenter == 0) { 517 /* Will have value(STRhome) here because set fast if don't */ 518 { 519 int osetintr = setintr; 520 sig_t oparintr = parintr; 521 sigset_t omask = sigblock(sigmask(SIGINT)); 522 523 setintr = 0; 524 parintr = SIG_IGN; /* Disable onintr */ 525 #ifdef _PATH_DOTCSHRC 526 (void) srcfile(_PATH_DOTCSHRC, 0, 0); 527 #endif 528 if (!fast && !arginp && !onelflg) 529 dohash(NULL, NULL); 530 #ifdef _PATH_DOTLOGIN 531 if (loginsh) 532 (void) srcfile(_PATH_DOTLOGIN, 0, 0); 533 #endif 534 (void) sigsetmask(omask); 535 setintr = osetintr; 536 parintr = oparintr; 537 } 538 (void) srccat(value(STRhome), STRsldotcshrc); 539 540 if (!fast && !arginp && !onelflg && !havhash) 541 dohash(NULL, NULL); 542 /* 543 * Source history before .login so that it is available in .login 544 */ 545 if ((cp = value(STRhistfile)) != STRNULL) 546 loadhist[2] = cp; 547 dosource(loadhist, NULL); 548 if (loginsh) 549 (void) srccat(value(STRhome), STRsldotlogin); 550 } 551 552 /* 553 * Now are ready for the -v and -x flags 554 */ 555 if (nverbose) 556 setNS(STRverbose); 557 if (nexececho) 558 setNS(STRecho); 559 560 /* 561 * All the rest of the world is inside this call. The argument to process 562 * indicates whether it should catch "error unwinds". Thus if we are a 563 * interactive shell our call here will never return by being blown past on 564 * an error. 565 */ 566 process(setintr); 567 568 /* 569 * Mop-up. 570 */ 571 if (intty) { 572 if (loginsh) { 573 (void) fprintf(cshout, "logout\n"); 574 (void) close(SHIN); 575 child = 1; 576 goodbye(); 577 } 578 else { 579 (void) fprintf(cshout, "exit\n"); 580 } 581 } 582 rechist(); 583 exitstat(); 584 return (0); 585 } 586 587 void 588 untty() 589 { 590 if (tpgrp > 0) { 591 (void) setpgid(0, opgrp); 592 (void) tcsetpgrp(FSHTTY, opgrp); 593 } 594 } 595 596 void 597 importpath(cp) 598 Char *cp; 599 { 600 register int i = 0; 601 register Char *dp; 602 register Char **pv; 603 int c; 604 605 for (dp = cp; *dp; dp++) 606 if (*dp == ':') 607 i++; 608 /* 609 * i+2 where i is the number of colons in the path. There are i+1 610 * directories in the path plus we need room for a zero terminator. 611 */ 612 pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **)); 613 dp = cp; 614 i = 0; 615 if (*dp) 616 for (;;) { 617 if ((c = *dp) == ':' || c == 0) { 618 *dp = 0; 619 if ((*cp != '/' || *cp == '\0') && (euid == 0 || uid == 0)) 620 (void) fprintf(csherr, 621 "Warning: imported path contains relative components\n"); 622 pv[i++] = Strsave(*cp ? cp : STRdot); 623 if (c) { 624 cp = dp + 1; 625 *dp = ':'; 626 } 627 else 628 break; 629 } 630 dp++; 631 } 632 pv[i] = 0; 633 set1(STRpath, pv, &shvhed); 634 } 635 636 /* 637 * Source to the file which is the catenation of the argument names. 638 */ 639 static int 640 srccat(cp, dp) 641 Char *cp, *dp; 642 { 643 register Char *ep = Strspl(cp, dp); 644 char *ptr = short2str(ep); 645 646 xfree((ptr_t) ep); 647 return srcfile(ptr, mflag ? 0 : 1, 0); 648 } 649 650 /* 651 * Source to a file putting the file descriptor in a safe place (> 2). 652 */ 653 static int 654 srcfile(f, onlyown, flag) 655 char *f; 656 bool onlyown, flag; 657 { 658 register int unit; 659 660 if ((unit = open(f, O_RDONLY)) == -1) 661 return 0; 662 unit = dmove(unit, -1); 663 664 (void) ioctl(unit, FIOCLEX, NULL); 665 srcunit(unit, onlyown, flag); 666 return 1; 667 } 668 669 /* 670 * Source to a unit. If onlyown it must be our file or our group or 671 * we don't chance it. This occurs on ".cshrc"s and the like. 672 */ 673 int insource; 674 static void 675 srcunit(unit, onlyown, hflg) 676 register int unit; 677 bool onlyown, hflg; 678 { 679 /* We have to push down a lot of state here */ 680 /* All this could go into a structure */ 681 int oSHIN = -1, oldintty = intty, oinsource = insource; 682 struct whyle *oldwhyl = whyles; 683 Char *ogointr = gointr, *oarginp = arginp; 684 Char *oevalp = evalp, **oevalvec = evalvec; 685 int oonelflg = onelflg; 686 bool oenterhist = enterhist; 687 char OHIST = HIST; 688 bool otell = cantell; 689 690 struct Bin saveB; 691 volatile sigset_t omask; 692 jmp_buf oldexit; 693 694 /* The (few) real local variables */ 695 int my_reenter; 696 697 if (unit < 0) 698 return; 699 if (didfds) 700 donefds(); 701 if (onlyown) { 702 struct stat stb; 703 704 if (fstat(unit, &stb) < 0) { 705 (void) close(unit); 706 return; 707 } 708 } 709 710 /* 711 * There is a critical section here while we are pushing down the input 712 * stream since we have stuff in different structures. If we weren't 713 * careful an interrupt could corrupt SHIN's Bin structure and kill the 714 * shell. 715 * 716 * We could avoid the critical region by grouping all the stuff in a single 717 * structure and pointing at it to move it all at once. This is less 718 * efficient globally on many variable references however. 719 */ 720 insource = 1; 721 getexit(oldexit); 722 omask = 0; 723 724 if (setintr) 725 omask = sigblock(sigmask(SIGINT)); 726 /* Setup the new values of the state stuff saved above */ 727 bcopy((char *) &B, (char *) &(saveB), sizeof(B)); 728 fbuf = NULL; 729 fseekp = feobp = fblocks = 0; 730 oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; 731 intty = isatty(SHIN), whyles = 0, gointr = 0; 732 evalvec = 0; 733 evalp = 0; 734 enterhist = hflg; 735 if (enterhist) 736 HIST = '\0'; 737 738 /* 739 * Now if we are allowing commands to be interrupted, we let ourselves be 740 * interrupted. 741 */ 742 if (setintr) 743 (void) sigsetmask(omask); 744 settell(); 745 746 if ((my_reenter = setexit()) == 0) 747 process(0); /* 0 -> blow away on errors */ 748 749 if (setintr) 750 (void) sigsetmask(omask); 751 if (oSHIN >= 0) { 752 register int i; 753 754 /* We made it to the new state... free up its storage */ 755 /* This code could get run twice but xfree doesn't care */ 756 for (i = 0; i < fblocks; i++) 757 xfree((ptr_t) fbuf[i]); 758 xfree((ptr_t) fbuf); 759 760 /* Reset input arena */ 761 bcopy((char *) &(saveB), (char *) &B, sizeof(B)); 762 763 (void) close(SHIN), SHIN = oSHIN; 764 arginp = oarginp, onelflg = oonelflg; 765 evalp = oevalp, evalvec = oevalvec; 766 intty = oldintty, whyles = oldwhyl, gointr = ogointr; 767 if (enterhist) 768 HIST = OHIST; 769 enterhist = oenterhist; 770 cantell = otell; 771 } 772 773 resexit(oldexit); 774 /* 775 * If process reset() (effectively an unwind) then we must also unwind. 776 */ 777 if (my_reenter) 778 stderror(ERR_SILENT); 779 insource = oinsource; 780 } 781 782 void 783 rechist() 784 { 785 Char buf[BUFSIZ], hbuf[BUFSIZ], *hfile; 786 int fp, ftmp, oldidfds; 787 struct varent *shist; 788 789 if (!fast) { 790 /* 791 * If $savehist is just set, we use the value of $history 792 * else we use the value in $savehist 793 */ 794 if ((shist = adrof(STRsavehist)) != NULL) { 795 if (shist->vec[0][0] != '\0') 796 (void) Strcpy(hbuf, shist->vec[0]); 797 else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0') 798 (void) Strcpy(hbuf, shist->vec[0]); 799 else 800 return; 801 } 802 else 803 return; 804 805 if ((hfile = value(STRhistfile)) == STRNULL) { 806 hfile = Strcpy(buf, value(STRhome)); 807 (void) Strcat(buf, STRsldthist); 808 } 809 810 if ((fp = creat(short2str(hfile), 0600)) == -1) 811 return; 812 813 oldidfds = didfds; 814 didfds = 0; 815 ftmp = SHOUT; 816 SHOUT = fp; 817 dumphist[2] = hbuf; 818 dohist(dumphist, NULL); 819 SHOUT = ftmp; 820 (void) close(fp); 821 didfds = oldidfds; 822 } 823 } 824 825 void 826 goodbye() 827 { 828 rechist(); 829 830 if (loginsh) { 831 (void) signal(SIGQUIT, SIG_IGN); 832 (void) signal(SIGINT, SIG_IGN); 833 (void) signal(SIGTERM, SIG_IGN); 834 setintr = 0; /* No interrupts after "logout" */ 835 if (!(adrof(STRlogout))) 836 set(STRlogout, STRnormal); 837 #ifdef _PATH_DOTLOGOUT 838 (void) srcfile(_PATH_DOTLOGOUT, 0, 0); 839 #endif 840 if (adrof(STRhome)) 841 (void) srccat(value(STRhome), STRsldtlogout); 842 } 843 exitstat(); 844 } 845 846 void 847 exitstat() 848 { 849 Char *s; 850 #ifdef PROF 851 monitor(0); 852 #endif 853 /* 854 * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit 855 * directly because we poke child here. Otherwise we might continue 856 * unwarrantedly (sic). 857 */ 858 child = 1; 859 s = value(STRstatus); 860 xexit(s ? getn(s) : 0); 861 } 862 863 /* 864 * in the event of a HUP we want to save the history 865 */ 866 static void 867 phup(sig) 868 int sig; 869 { 870 rechist(); 871 872 /* 873 * We kill the last foreground process group. It then becomes 874 * responsible to propagate the SIGHUP to its progeny. 875 */ 876 { 877 struct process *pp, *np; 878 879 for (pp = proclist.p_next; pp; pp = pp->p_next) { 880 np = pp; 881 /* 882 * Find if this job is in the foreground. It could be that 883 * the process leader has exited and the foreground flag 884 * is cleared for it. 885 */ 886 do 887 /* 888 * If a process is in the foreground; we try to kill 889 * it's process group. If we succeed, then the 890 * whole job is gone. Otherwise we keep going... 891 * But avoid sending HUP to the shell again. 892 */ 893 if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp && 894 killpg(np->p_jobid, SIGHUP) != -1) { 895 /* In case the job was suspended... */ 896 (void) killpg(np->p_jobid, SIGCONT); 897 break; 898 } 899 while ((np = np->p_friends) != pp); 900 } 901 } 902 xexit(sig); 903 } 904 905 Char *jobargv[2] = {STRjobs, 0}; 906 907 /* 908 * Catch an interrupt, e.g. during lexical input. 909 * If we are an interactive shell, we reset the interrupt catch 910 * immediately. In any case we drain the shell output, 911 * and finally go through the normal error mechanism, which 912 * gets a chance to make the shell go away. 913 */ 914 /* ARGSUSED */ 915 void 916 pintr(notused) 917 int notused; 918 { 919 pintr1(1); 920 } 921 922 void 923 pintr1(wantnl) 924 bool wantnl; 925 { 926 Char **v; 927 sigset_t omask; 928 929 omask = sigblock((sigset_t) 0); 930 if (setintr) { 931 (void) sigsetmask(omask & ~sigmask(SIGINT)); 932 if (pjobs) { 933 pjobs = 0; 934 (void) fprintf(cshout, "\n"); 935 dojobs(jobargv, NULL); 936 stderror(ERR_NAME | ERR_INTR); 937 } 938 } 939 (void) sigsetmask(omask & ~sigmask(SIGCHLD)); 940 (void) fpurge(cshout); 941 (void) endpwent(); 942 943 /* 944 * If we have an active "onintr" then we search for the label. Note that if 945 * one does "onintr -" then we shan't be interruptible so we needn't worry 946 * about that here. 947 */ 948 if (gointr) { 949 gotolab(gointr); 950 timflg = 0; 951 if ((v = pargv) != NULL) 952 pargv = 0, blkfree(v); 953 if ((v = gargv) != NULL) 954 gargv = 0, blkfree(v); 955 reset(); 956 } 957 else if (intty && wantnl) { 958 (void) fputc('\r', cshout); 959 (void) fputc('\n', cshout); 960 } 961 stderror(ERR_SILENT); 962 } 963 964 /* 965 * Process is the main driving routine for the shell. 966 * It runs all command processing, except for those within { ... } 967 * in expressions (which is run by a routine evalav in sh.exp.c which 968 * is a stripped down process), and `...` evaluation which is run 969 * also by a subset of this code in sh.glob.c in the routine backeval. 970 * 971 * The code here is a little strange because part of it is interruptible 972 * and hence freeing of structures appears to occur when none is necessary 973 * if this is ignored. 974 * 975 * Note that if catch is not set then we will unwind on any error. 976 * If an end-of-file occurs, we return. 977 */ 978 static struct command *savet = NULL; 979 void 980 process(catch) 981 bool catch; 982 { 983 jmp_buf osetexit; 984 struct command *t = savet; 985 986 savet = NULL; 987 getexit(osetexit); 988 for (;;) { 989 pendjob(); 990 paraml.next = paraml.prev = ¶ml; 991 paraml.word = STRNULL; 992 (void) setexit(); 993 justpr = enterhist; /* execute if not entering history */ 994 995 /* 996 * Interruptible during interactive reads 997 */ 998 if (setintr) 999 (void) sigsetmask(sigblock((sigset_t) 0) & ~sigmask(SIGINT)); 1000 1001 /* 1002 * For the sake of reset() 1003 */ 1004 freelex(¶ml); 1005 if (savet) 1006 freesyn(savet), savet = NULL; 1007 1008 if (haderr) { 1009 if (!catch) { 1010 /* unwind */ 1011 doneinp = 0; 1012 resexit(osetexit); 1013 savet = t; 1014 reset(); 1015 } 1016 haderr = 0; 1017 /* 1018 * Every error is eventually caught here or the shell dies. It is 1019 * at this point that we clean up any left-over open files, by 1020 * closing all but a fixed number of pre-defined files. Thus 1021 * routines don't have to worry about leaving files open due to 1022 * deeper errors... they will get closed here. 1023 */ 1024 closem(); 1025 continue; 1026 } 1027 if (doneinp) { 1028 doneinp = 0; 1029 break; 1030 } 1031 if (chkstop) 1032 chkstop--; 1033 if (neednote) 1034 pnote(); 1035 if (intty && prompt && evalvec == 0) { 1036 mailchk(); 1037 /* 1038 * If we are at the end of the input buffer then we are going to 1039 * read fresh stuff. Otherwise, we are rereading input and don't 1040 * need or want to prompt. 1041 */ 1042 if (aret == F_SEEK && fseekp == feobp) 1043 printprompt(); 1044 (void) fflush(cshout); 1045 } 1046 if (seterr) { 1047 xfree((ptr_t) seterr); 1048 seterr = NULL; 1049 } 1050 1051 /* 1052 * Echo not only on VERBOSE, but also with history expansion. If there 1053 * is a lexical error then we forego history echo. 1054 */ 1055 if ((lex(¶ml) && !seterr && intty) || adrof(STRverbose)) { 1056 prlex(csherr, ¶ml); 1057 } 1058 1059 /* 1060 * The parser may lose space if interrupted. 1061 */ 1062 if (setintr) 1063 (void) sigblock(sigmask(SIGINT)); 1064 1065 /* 1066 * Save input text on the history list if reading in old history, or it 1067 * is from the terminal at the top level and not in a loop. 1068 * 1069 * PWP: entry of items in the history list while in a while loop is done 1070 * elsewhere... 1071 */ 1072 if (enterhist || (catch && intty && !whyles)) 1073 savehist(¶ml); 1074 1075 /* 1076 * Print lexical error messages, except when sourcing history lists. 1077 */ 1078 if (!enterhist && seterr) 1079 stderror(ERR_OLD); 1080 1081 /* 1082 * If had a history command :p modifier then this is as far as we 1083 * should go 1084 */ 1085 if (justpr) 1086 reset(); 1087 1088 alias(¶ml); 1089 1090 /* 1091 * Parse the words of the input into a parse tree. 1092 */ 1093 savet = syntax(paraml.next, ¶ml, 0); 1094 if (seterr) 1095 stderror(ERR_OLD); 1096 1097 execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); 1098 1099 /* 1100 * Made it! 1101 */ 1102 freelex(¶ml); 1103 freesyn((struct command *) savet), savet = NULL; 1104 } 1105 resexit(osetexit); 1106 savet = t; 1107 } 1108 1109 void 1110 /*ARGSUSED*/ 1111 dosource(v, t) 1112 Char **v; 1113 struct command *t; 1114 1115 { 1116 register Char *f; 1117 bool hflg = 0; 1118 Char buf[BUFSIZ]; 1119 1120 v++; 1121 if (*v && eq(*v, STRmh)) { 1122 if (*++v == NULL) 1123 stderror(ERR_NAME | ERR_HFLAG); 1124 hflg++; 1125 } 1126 (void) Strcpy(buf, *v); 1127 f = globone(buf, G_ERROR); 1128 (void) strcpy((char *) buf, short2str(f)); 1129 xfree((ptr_t) f); 1130 if (!srcfile((char *) buf, 0, hflg) && !hflg) 1131 stderror(ERR_SYSTEM, (char *) buf, strerror(errno)); 1132 } 1133 1134 /* 1135 * Check for mail. 1136 * If we are a login shell, then we don't want to tell 1137 * about any mail file unless its been modified 1138 * after the time we started. 1139 * This prevents us from telling the user things he already 1140 * knows, since the login program insists on saying 1141 * "You have mail." 1142 */ 1143 static void 1144 mailchk() 1145 { 1146 register struct varent *v; 1147 register Char **vp; 1148 time_t t; 1149 int intvl, cnt; 1150 struct stat stb; 1151 bool new; 1152 1153 v = adrof(STRmail); 1154 if (v == 0) 1155 return; 1156 (void) time(&t); 1157 vp = v->vec; 1158 cnt = blklen(vp); 1159 intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; 1160 if (intvl < 1) 1161 intvl = 1; 1162 if (chktim + intvl > t) 1163 return; 1164 for (; *vp; vp++) { 1165 if (stat(short2str(*vp), &stb) < 0) 1166 continue; 1167 new = stb.st_mtime > time0.tv_sec; 1168 if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || 1169 (stb.st_atime < chktim && stb.st_mtime < chktim) || 1170 (loginsh && !new)) 1171 continue; 1172 if (cnt == 1) 1173 (void) fprintf(cshout, "You have %smail.\n", new ? "new " : ""); 1174 else 1175 (void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail", 1176 vis_str(*vp)); 1177 } 1178 chktim = t; 1179 } 1180 1181 /* 1182 * Extract a home directory from the password file 1183 * The argument points to a buffer where the name of the 1184 * user whose home directory is sought is currently. 1185 * We write the home directory of the user back there. 1186 */ 1187 int 1188 gethdir(home) 1189 Char *home; 1190 { 1191 Char *h; 1192 struct passwd *pw; 1193 1194 /* 1195 * Is it us? 1196 */ 1197 if (*home == '\0') { 1198 if ((h = value(STRhome)) != NULL) { 1199 (void) Strcpy(home, h); 1200 return 0; 1201 } 1202 else 1203 return 1; 1204 } 1205 1206 if ((pw = getpwnam(short2str(home))) != NULL) { 1207 (void) Strcpy(home, str2short(pw->pw_dir)); 1208 return 0; 1209 } 1210 else 1211 return 1; 1212 } 1213 1214 /* 1215 * When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17 1216 * We also check if the shell has already changed the decriptor to point to 1217 * 0, 1, 2 when didfds is set. 1218 */ 1219 #define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0)) 1220 1221 static int 1222 readf(oreo, buf, siz) 1223 void *oreo; 1224 char *buf; 1225 int siz; 1226 { 1227 return read(DESC(oreo), buf, siz); 1228 } 1229 1230 1231 static int 1232 writef(oreo, buf, siz) 1233 void *oreo; 1234 const char *buf; 1235 int siz; 1236 { 1237 return write(DESC(oreo), buf, siz); 1238 } 1239 1240 static fpos_t 1241 seekf(oreo, off, whence) 1242 void *oreo; 1243 fpos_t off; 1244 int whence; 1245 { 1246 return lseek(DESC(oreo), off, whence); 1247 } 1248 1249 1250 static int 1251 closef(oreo) 1252 void *oreo; 1253 { 1254 return close(DESC(oreo)); 1255 } 1256 1257 1258 /* 1259 * Print the visible version of a string. 1260 */ 1261 int 1262 vis_fputc(ch, fp) 1263 int ch; 1264 FILE *fp; 1265 { 1266 char uenc[5]; /* 4 + NULL */ 1267 1268 if (ch & QUOTE) 1269 return fputc(ch & TRIM, fp); 1270 /* 1271 * XXX: When we are in AsciiOnly we want all characters >= 0200 to 1272 * be encoded, but currently there is no way in vis to do that. 1273 */ 1274 (void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0); 1275 return fputs(uenc, fp); 1276 } 1277 1278 /* 1279 * Move the initial descriptors to their eventual 1280 * resting places, closin all other units. 1281 */ 1282 void 1283 initdesc() 1284 { 1285 1286 didfds = 0; /* 0, 1, 2 aren't set up */ 1287 (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); 1288 (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); 1289 (void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL); 1290 (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); 1291 closem(); 1292 } 1293 1294 1295 void 1296 #ifdef PROF 1297 done(i) 1298 #else 1299 xexit(i) 1300 #endif 1301 int i; 1302 { 1303 untty(); 1304 _exit(i); 1305 } 1306 1307 static Char ** 1308 defaultpath() 1309 { 1310 char *ptr; 1311 Char **blk, **blkp; 1312 struct stat stb; 1313 1314 blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10); 1315 1316 #define DIRAPPEND(a) \ 1317 if (stat(ptr = a, &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFDIR) \ 1318 *blkp++ = SAVE(ptr) 1319 1320 DIRAPPEND(_PATH_BIN); 1321 DIRAPPEND(_PATH_USRBIN); 1322 1323 #undef DIRAPPEND 1324 1325 if (euid != 0 && uid != 0) 1326 *blkp++ = Strsave(STRdot); 1327 *blkp = NULL; 1328 return (blk); 1329 } 1330 1331 void 1332 printprompt() 1333 { 1334 register Char *cp; 1335 1336 if (!whyles) { 1337 for (cp = value(STRprompt); *cp; cp++) 1338 if (*cp == HIST) 1339 (void) fprintf(cshout, "%d", eventno + 1); 1340 else { 1341 if (*cp == '\\' && cp[1] == HIST) 1342 cp++; 1343 (void) vis_fputc(*cp | QUOTE, cshout); 1344 } 1345 } 1346 else 1347 /* 1348 * Prompt for forward reading loop body content. 1349 */ 1350 (void) fprintf(cshout, "? "); 1351 (void) fflush(cshout); 1352 } 1353