1 /* $NetBSD: csh.c,v 1.17 1997/07/04 21:23:53 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)csh.c 8.2 (Berkeley) 10/12/93"; 45 #else 46 __RCSID("$NetBSD: csh.c,v 1.17 1997/07/04 21:23:53 christos Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/types.h> 51 #include <sys/ioctl.h> 52 #include <sys/stat.h> 53 #include <fcntl.h> 54 #include <errno.h> 55 #include <pwd.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <locale.h> 59 #include <unistd.h> 60 #include <vis.h> 61 #if __STDC__ 62 # include <stdarg.h> 63 #else 64 # include <varargs.h> 65 #endif 66 67 #include "csh.h" 68 #include "proc.h" 69 #include "extern.h" 70 #include "pathnames.h" 71 72 extern bool MapsAreInited; 73 extern bool NLSMapsAreInited; 74 75 /* 76 * C Shell 77 * 78 * Bill Joy, UC Berkeley, California, USA 79 * October 1978, May 1980 80 * 81 * Jim Kulp, IIASA, Laxenburg, Austria 82 * April 1980 83 * 84 * Christos Zoulas, Cornell University 85 * June, 1991 86 */ 87 88 Char *dumphist[] = {STRhistory, STRmh, 0, 0}; 89 Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0}; 90 91 int nofile = 0; 92 bool reenter = 0; 93 bool nverbose = 0; 94 bool nexececho = 0; 95 bool quitit = 0; 96 bool fast = 0; 97 bool batch = 0; 98 bool mflag = 0; 99 bool prompt = 1; 100 bool enterhist = 0; 101 bool tellwhat = 0; 102 103 extern char **environ; 104 105 static int readf __P((void *, char *, int)); 106 static fpos_t seekf __P((void *, fpos_t, int)); 107 static int writef __P((void *, const char *, int)); 108 static int closef __P((void *)); 109 static int srccat __P((Char *, Char *)); 110 static int srcfile __P((char *, bool, bool)); 111 static void phup __P((int)); 112 static void srcunit __P((int, bool, bool)); 113 static void mailchk __P((void)); 114 static Char **defaultpath __P((void)); 115 116 int main __P((int, char **)); 117 118 int 119 main(argc, argv) 120 int argc; 121 char **argv; 122 { 123 Char *cp; 124 char *tcp; 125 int f; 126 char **tempv; 127 struct sigaction oact; 128 sigset_t sigset; 129 130 cshin = stdin; 131 cshout = stdout; 132 csherr = stderr; 133 134 settimes(); /* Immed. estab. timing base */ 135 136 /* 137 * Initialize non constant strings 138 */ 139 #ifdef _PATH_BSHELL 140 STR_BSHELL = SAVE(_PATH_BSHELL); 141 #endif 142 #ifdef _PATH_CSHELL 143 STR_SHELLPATH = SAVE(_PATH_CSHELL); 144 #endif 145 STR_environ = blk2short(environ); 146 environ = short2blk(STR_environ); /* So that we can free it */ 147 STR_WORD_CHARS = SAVE(WORD_CHARS); 148 149 HIST = '!'; 150 HISTSUB = '^'; 151 word_chars = STR_WORD_CHARS; 152 153 tempv = argv; 154 if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ 155 quitit = 1; 156 uid = getuid(); 157 gid = getgid(); 158 euid = geteuid(); 159 egid = getegid(); 160 /* 161 * We are a login shell if: 1. we were invoked as -<something> and we had 162 * no arguments 2. or we were invoked only with the -l flag 163 */ 164 loginsh = (**tempv == '-' && argc == 1) || 165 (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && 166 tempv[1][2] == '\0'); 167 168 if (loginsh && **tempv != '-') { 169 /* 170 * Mangle the argv space 171 */ 172 tempv[1][0] = '\0'; 173 tempv[1][1] = '\0'; 174 tempv[1] = NULL; 175 for (tcp = *tempv; *tcp++;) 176 continue; 177 for (tcp--; tcp >= *tempv; tcp--) 178 tcp[1] = tcp[0]; 179 *++tcp = '-'; 180 argc--; 181 } 182 if (loginsh) 183 (void) time(&chktim); 184 185 AsciiOnly = 1; 186 #ifdef NLS 187 (void) setlocale(LC_ALL, ""); 188 { 189 int k; 190 191 for (k = 0200; k <= 0377 && !Isprint(k); k++) 192 continue; 193 AsciiOnly = k > 0377; 194 } 195 #else 196 AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL; 197 #endif /* NLS */ 198 199 /* 200 * Move the descriptors to safe places. The variable didfds is 0 while we 201 * have only FSH* to work with. When didfds is true, we have 0,1,2 and 202 * prefer to use these. 203 */ 204 initdesc(); 205 /* 206 * XXX: This is to keep programs that use stdio happy. 207 * what we really want is freunopen() .... 208 * Closing cshin cshout and csherr (which are really stdin stdout 209 * and stderr at this point and then reopening them in the same order 210 * gives us again stdin == cshin stdout == cshout and stderr == csherr. 211 * If that was not the case builtins like printf that use stdio 212 * would break. But in any case we could fix that with memcpy and 213 * a bit of pointer manipulation... 214 * Fortunately this is not needed under the current implementation 215 * of stdio. 216 */ 217 (void) fclose(cshin); 218 (void) fclose(cshout); 219 (void) fclose(csherr); 220 if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef))) 221 exit(1); 222 if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef))) 223 exit(1); 224 if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef))) 225 exit(1); 226 (void) setvbuf(cshin, NULL, _IOLBF, 0); 227 (void) setvbuf(cshout, NULL, _IOLBF, 0); 228 (void) setvbuf(csherr, NULL, _IOLBF, 0); 229 230 /* 231 * Initialize the shell variables. ARGV and PROMPT are initialized later. 232 * STATUS is also munged in several places. CHILD is munged when 233 * forking/waiting 234 */ 235 set(STRstatus, Strsave(STR0)); 236 237 if ((tcp = getenv("HOME")) != NULL) 238 cp = quote(SAVE(tcp)); 239 else 240 cp = NULL; 241 242 if (cp == NULL) 243 fast = 1; /* No home -> can't read scripts */ 244 else 245 set(STRhome, cp); 246 dinit(cp); /* dinit thinks that HOME == cwd in a login 247 * shell */ 248 /* 249 * Grab other useful things from the environment. Should we grab 250 * everything?? 251 */ 252 if ((tcp = getenv("LOGNAME")) != NULL || 253 (tcp = getenv("USER")) != NULL) 254 set(STRuser, quote(SAVE(tcp))); 255 if ((tcp = getenv("TERM")) != NULL) 256 set(STRterm, quote(SAVE(tcp))); 257 258 /* 259 * Re-initialize path if set in environment 260 */ 261 if ((tcp = getenv("PATH")) == NULL) 262 setq(STRpath, defaultpath(), &shvhed); 263 else 264 importpath(SAVE(tcp)); 265 266 set(STRshell, Strsave(STR_SHELLPATH)); 267 268 doldol = putn((int) getpid()); /* For $$ */ 269 shtemp = Strspl(STRtmpsh, doldol); /* For << */ 270 271 /* 272 * Record the interrupt states from the parent process. If the parent is 273 * non-interruptible our hand must be forced or we (and our children) won't 274 * be either. Our children inherit termination from our parent. We catch it 275 * only if we are the login shell. 276 */ 277 /* parents interruptibility */ 278 (void) sigaction(SIGINT, NULL, &oact); 279 parintr = oact.sa_handler; 280 (void) sigaction(SIGTERM, NULL, &oact); 281 parterm = oact.sa_handler; 282 283 /* catch these all, login shell or not */ 284 (void) signal(SIGHUP, phup); /* exit processing on HUP */ 285 (void) signal(SIGXCPU, phup); /* ...and on XCPU */ 286 (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ 287 288 /* 289 * Process the arguments. 290 * 291 * Note that processing of -v/-x is actually delayed till after script 292 * processing. 293 * 294 * We set the first character of our name to be '-' if we are a shell 295 * running interruptible commands. Many programs which examine ps'es 296 * use this to filter such shells out. 297 */ 298 argc--, tempv++; 299 while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { 300 do 301 switch (*tcp++) { 302 303 case 0: /* - Interruptible, no prompt */ 304 prompt = 0; 305 setintr = 1; 306 nofile = 1; 307 break; 308 309 case 'b': /* -b Next arg is input file */ 310 batch = 1; 311 break; 312 313 case 'c': /* -c Command input from arg */ 314 if (argc == 1) 315 xexit(0); 316 argc--, tempv++; 317 arginp = SAVE(tempv[0]); 318 prompt = 0; 319 nofile = 1; 320 break; 321 322 case 'e': /* -e Exit on any error */ 323 exiterr = 1; 324 break; 325 326 case 'f': /* -f Fast start */ 327 fast = 1; 328 break; 329 330 case 'i': /* -i Interactive, even if !intty */ 331 intact = 1; 332 nofile = 1; 333 break; 334 335 case 'm': /* -m read .cshrc (from su) */ 336 mflag = 1; 337 break; 338 339 case 'n': /* -n Don't execute */ 340 noexec = 1; 341 break; 342 343 case 'q': /* -q (Undoc'd) ... die on quit */ 344 quitit = 1; 345 break; 346 347 case 's': /* -s Read from std input */ 348 nofile = 1; 349 break; 350 351 case 't': /* -t Read one line from input */ 352 onelflg = 2; 353 prompt = 0; 354 nofile = 1; 355 break; 356 357 case 'v': /* -v Echo hist expanded input */ 358 nverbose = 1; /* ... later */ 359 break; 360 361 case 'x': /* -x Echo just before execution */ 362 nexececho = 1; /* ... later */ 363 break; 364 365 case 'V': /* -V Echo hist expanded input */ 366 setNS(STRverbose); /* NOW! */ 367 break; 368 369 case 'X': /* -X Echo just before execution */ 370 setNS(STRecho); /* NOW! */ 371 break; 372 373 } while (*tcp); 374 tempv++, argc--; 375 } 376 377 if (quitit) /* With all due haste, for debugging */ 378 (void) signal(SIGQUIT, SIG_DFL); 379 380 /* 381 * Unless prevented by -, -c, -i, -s, or -t, if there are remaining 382 * arguments the first of them is the name of a shell file from which to 383 * read commands. 384 */ 385 if (nofile == 0 && argc > 0) { 386 nofile = open(tempv[0], O_RDONLY); 387 if (nofile < 0) { 388 child = 1; /* So this doesn't return */ 389 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 390 } 391 ffile = SAVE(tempv[0]); 392 /* 393 * Replace FSHIN. Handle /dev/std{in,out,err} specially 394 * since once they are closed we cannot open them again. 395 * In that case we use our own saved descriptors 396 */ 397 if ((SHIN = dmove(nofile, FSHIN)) < 0) 398 switch(nofile) { 399 case 0: 400 SHIN = FSHIN; 401 break; 402 case 1: 403 SHIN = FSHOUT; 404 break; 405 case 2: 406 SHIN = FSHERR; 407 break; 408 default: 409 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 410 break; 411 } 412 (void) ioctl(SHIN, FIOCLEX, NULL); 413 prompt = 0; 414 /* argc not used any more */ tempv++; 415 } 416 417 intty = isatty(SHIN); 418 intty |= intact; 419 if (intty || (intact && isatty(SHOUT))) { 420 if (!batch && (uid != euid || gid != egid)) { 421 errno = EACCES; 422 child = 1; /* So this doesn't return */ 423 stderror(ERR_SYSTEM, "csh", strerror(errno)); 424 } 425 } 426 /* 427 * Decide whether we should play with signals or not. If we are explicitly 428 * told (via -i, or -) or we are a login shell (arg0 starts with -) or the 429 * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") 430 * Note that in only the login shell is it likely that parent may have set 431 * signals to be ignored 432 */ 433 if (loginsh || intact || (intty && isatty(SHOUT))) 434 setintr = 1; 435 settell(); 436 /* 437 * Save the remaining arguments in argv. 438 */ 439 setq(STRargv, blk2short(tempv), &shvhed); 440 441 /* 442 * Set up the prompt. 443 */ 444 if (prompt) { 445 set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); 446 /* that's a meta-questionmark */ 447 set(STRprompt2, Strsave(STRmquestion)); 448 } 449 450 /* 451 * If we are an interactive shell, then start fiddling with the signals; 452 * this is a tricky game. 453 */ 454 shpgrp = getpgrp(); 455 opgrp = tpgrp = -1; 456 if (setintr) { 457 **argv = '-'; 458 if (!quitit) /* Wary! */ 459 (void) signal(SIGQUIT, SIG_IGN); 460 (void) signal(SIGINT, pintr); 461 sigemptyset(&sigset); 462 sigaddset(&sigset, SIGINT); 463 sigprocmask(SIG_BLOCK, &sigset, NULL); 464 (void) signal(SIGTERM, SIG_IGN); 465 if (quitit == 0 && arginp == 0) { 466 (void) signal(SIGTSTP, SIG_IGN); 467 (void) signal(SIGTTIN, SIG_IGN); 468 (void) signal(SIGTTOU, SIG_IGN); 469 /* 470 * Wait till in foreground, in case someone stupidly runs csh & 471 * dont want to try to grab away the tty. 472 */ 473 if (isatty(FSHERR)) 474 f = FSHERR; 475 else if (isatty(FSHOUT)) 476 f = FSHOUT; 477 else if (isatty(OLDSTD)) 478 f = OLDSTD; 479 else 480 f = -1; 481 retry: 482 if ((tpgrp = tcgetpgrp(f)) != -1) { 483 if (tpgrp != shpgrp) { 484 sig_t old = signal(SIGTTIN, SIG_DFL); 485 (void) kill(0, SIGTTIN); 486 (void) signal(SIGTTIN, old); 487 goto retry; 488 } 489 opgrp = shpgrp; 490 shpgrp = getpid(); 491 tpgrp = shpgrp; 492 /* 493 * Setpgid will fail if we are a session leader and 494 * mypid == mypgrp (POSIX 4.3.3) 495 */ 496 if (opgrp != shpgrp) 497 if (setpgid(0, shpgrp) == -1) 498 goto notty; 499 /* 500 * We do that after we set our process group, to make sure 501 * that the process group belongs to a process in the same 502 * session as the tty (our process and our group) (POSIX 7.2.4) 503 */ 504 if (tcsetpgrp(f, shpgrp) == -1) 505 goto notty; 506 (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); 507 } 508 if (tpgrp == -1) { 509 notty: 510 (void) fprintf(csherr, "Warning: no access to tty (%s).\n", 511 strerror(errno)); 512 (void) fprintf(csherr, "Thus no job control in this shell.\n"); 513 } 514 } 515 } 516 if ((setintr == 0) && (parintr == SIG_DFL)) 517 setintr = 1; 518 (void) signal(SIGCHLD, pchild); /* while signals not ready */ 519 520 /* 521 * Set an exit here in case of an interrupt or error reading the shell 522 * start-up scripts. 523 */ 524 reenter = setexit(); /* PWP */ 525 haderr = 0; /* In case second time through */ 526 if (!fast && reenter == 0) { 527 /* Will have value(STRhome) here because set fast if don't */ 528 { 529 int osetintr = setintr; 530 sig_t oparintr = parintr; 531 sigset_t osigset; 532 533 sigemptyset(&sigset); 534 sigaddset(&sigset, SIGINT); 535 sigprocmask(SIG_BLOCK, &sigset, &osigset); 536 537 setintr = 0; 538 parintr = SIG_IGN; /* Disable onintr */ 539 #ifdef _PATH_DOTCSHRC 540 (void) srcfile(_PATH_DOTCSHRC, 0, 0); 541 #endif 542 if (!fast && !arginp && !onelflg) 543 dohash(NULL, NULL); 544 #ifdef _PATH_DOTLOGIN 545 if (loginsh) 546 (void) srcfile(_PATH_DOTLOGIN, 0, 0); 547 #endif 548 sigprocmask(SIG_SETMASK, &osigset, NULL); 549 setintr = osetintr; 550 parintr = oparintr; 551 } 552 (void) srccat(value(STRhome), STRsldotcshrc); 553 554 if (!fast && !arginp && !onelflg && !havhash) 555 dohash(NULL, NULL); 556 /* 557 * Source history before .login so that it is available in .login 558 */ 559 if ((cp = value(STRhistfile)) != STRNULL) 560 loadhist[2] = cp; 561 dosource(loadhist, NULL); 562 if (loginsh) 563 (void) srccat(value(STRhome), STRsldotlogin); 564 } 565 566 /* 567 * Now are ready for the -v and -x flags 568 */ 569 if (nverbose) 570 setNS(STRverbose); 571 if (nexececho) 572 setNS(STRecho); 573 574 /* 575 * All the rest of the world is inside this call. The argument to process 576 * indicates whether it should catch "error unwinds". Thus if we are a 577 * interactive shell our call here will never return by being blown past on 578 * an error. 579 */ 580 process(setintr); 581 582 /* 583 * Mop-up. 584 */ 585 if (intty) { 586 if (loginsh) { 587 (void) fprintf(cshout, "logout\n"); 588 (void) close(SHIN); 589 child = 1; 590 goodbye(); 591 } 592 else { 593 (void) fprintf(cshout, "exit\n"); 594 } 595 } 596 rechist(); 597 exitstat(); 598 return (0); 599 } 600 601 void 602 untty() 603 { 604 if (tpgrp > 0) { 605 (void) setpgid(0, opgrp); 606 (void) tcsetpgrp(FSHTTY, opgrp); 607 } 608 } 609 610 void 611 importpath(cp) 612 Char *cp; 613 { 614 int i = 0; 615 Char *dp; 616 Char **pv; 617 int c; 618 619 for (dp = cp; *dp; dp++) 620 if (*dp == ':') 621 i++; 622 /* 623 * i+2 where i is the number of colons in the path. There are i+1 624 * directories in the path plus we need room for a zero terminator. 625 */ 626 pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **)); 627 dp = cp; 628 i = 0; 629 if (*dp) 630 for (;;) { 631 if ((c = *dp) == ':' || c == 0) { 632 *dp = 0; 633 pv[i++] = Strsave(*cp ? cp : STRdot); 634 if (c) { 635 cp = dp + 1; 636 *dp = ':'; 637 } 638 else 639 break; 640 } 641 dp++; 642 } 643 pv[i] = 0; 644 set1(STRpath, pv, &shvhed); 645 } 646 647 /* 648 * Source to the file which is the catenation of the argument names. 649 */ 650 static int 651 srccat(cp, dp) 652 Char *cp, *dp; 653 { 654 Char *ep = Strspl(cp, dp); 655 char *ptr = short2str(ep); 656 657 xfree((ptr_t) ep); 658 return srcfile(ptr, mflag ? 0 : 1, 0); 659 } 660 661 /* 662 * Source to a file putting the file descriptor in a safe place (> 2). 663 */ 664 static int 665 srcfile(f, onlyown, flag) 666 char *f; 667 bool onlyown, flag; 668 { 669 int unit; 670 671 if ((unit = open(f, O_RDONLY)) == -1) 672 return 0; 673 unit = dmove(unit, -1); 674 675 (void) ioctl(unit, FIOCLEX, NULL); 676 srcunit(unit, onlyown, flag); 677 return 1; 678 } 679 680 /* 681 * Source to a unit. If onlyown it must be our file or our group or 682 * we don't chance it. This occurs on ".cshrc"s and the like. 683 */ 684 int insource; 685 static void 686 srcunit(unit, onlyown, hflg) 687 int unit; 688 bool onlyown, hflg; 689 { 690 /* We have to push down a lot of state here */ 691 /* All this could go into a structure */ 692 int oSHIN = -1, oldintty = intty, oinsource = insource; 693 struct whyle *oldwhyl = whyles; 694 Char *ogointr = gointr, *oarginp = arginp; 695 Char *oevalp = evalp, **oevalvec = evalvec; 696 int oonelflg = onelflg; 697 bool oenterhist = enterhist; 698 char OHIST = HIST; 699 bool otell = cantell; 700 701 struct Bin saveB; 702 sigset_t sigset, osigset; 703 jmp_buf oldexit; 704 705 /* The (few) real local variables */ 706 int my_reenter; 707 708 if (unit < 0) 709 return; 710 if (didfds) 711 donefds(); 712 if (onlyown) { 713 struct stat stb; 714 715 if (fstat(unit, &stb) < 0) { 716 (void) close(unit); 717 return; 718 } 719 } 720 721 /* 722 * There is a critical section here while we are pushing down the input 723 * stream since we have stuff in different structures. If we weren't 724 * careful an interrupt could corrupt SHIN's Bin structure and kill the 725 * shell. 726 * 727 * We could avoid the critical region by grouping all the stuff in a single 728 * structure and pointing at it to move it all at once. This is less 729 * efficient globally on many variable references however. 730 */ 731 insource = 1; 732 getexit(oldexit); 733 734 if (setintr) { 735 sigemptyset(&sigset); 736 sigaddset(&sigset, SIGINT); 737 sigprocmask(SIG_BLOCK, &sigset, &osigset); 738 } 739 /* Setup the new values of the state stuff saved above */ 740 memcpy(&saveB, &B, sizeof(B)); 741 fbuf = NULL; 742 fseekp = feobp = fblocks = 0; 743 oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; 744 intty = isatty(SHIN), whyles = 0, gointr = 0; 745 evalvec = 0; 746 evalp = 0; 747 enterhist = hflg; 748 if (enterhist) 749 HIST = '\0'; 750 751 /* 752 * Now if we are allowing commands to be interrupted, we let ourselves be 753 * interrupted. 754 */ 755 if (setintr) 756 sigprocmask(SIG_SETMASK, &osigset, NULL); 757 settell(); 758 759 if ((my_reenter = setexit()) == 0) 760 process(0); /* 0 -> blow away on errors */ 761 762 if (setintr) 763 sigprocmask(SIG_SETMASK, &osigset, NULL); 764 if (oSHIN >= 0) { 765 int i; 766 767 /* We made it to the new state... free up its storage */ 768 /* This code could get run twice but xfree doesn't care */ 769 for (i = 0; i < fblocks; i++) 770 xfree((ptr_t) fbuf[i]); 771 xfree((ptr_t) fbuf); 772 773 /* Reset input arena */ 774 memcpy(&B, &saveB, sizeof(B)); 775 776 (void) close(SHIN), SHIN = oSHIN; 777 arginp = oarginp, onelflg = oonelflg; 778 evalp = oevalp, evalvec = oevalvec; 779 intty = oldintty, whyles = oldwhyl, gointr = ogointr; 780 if (enterhist) 781 HIST = OHIST; 782 enterhist = oenterhist; 783 cantell = otell; 784 } 785 786 resexit(oldexit); 787 /* 788 * If process reset() (effectively an unwind) then we must also unwind. 789 */ 790 if (my_reenter) 791 stderror(ERR_SILENT); 792 insource = oinsource; 793 } 794 795 void 796 rechist() 797 { 798 Char buf[BUFSIZ], hbuf[BUFSIZ], *hfile; 799 int fp, ftmp, oldidfds; 800 struct varent *shist; 801 802 if (!fast) { 803 /* 804 * If $savehist is just set, we use the value of $history 805 * else we use the value in $savehist 806 */ 807 if ((shist = adrof(STRsavehist)) != NULL) { 808 if (shist->vec[0][0] != '\0') 809 (void) Strcpy(hbuf, shist->vec[0]); 810 else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0') 811 (void) Strcpy(hbuf, shist->vec[0]); 812 else 813 return; 814 } 815 else 816 return; 817 818 if ((hfile = value(STRhistfile)) == STRNULL) { 819 hfile = Strcpy(buf, value(STRhome)); 820 (void) Strcat(buf, STRsldthist); 821 } 822 823 if ((fp = open(short2str(hfile), O_WRONLY | O_CREAT | O_TRUNC, 824 0600)) == -1) 825 return; 826 827 oldidfds = didfds; 828 didfds = 0; 829 ftmp = SHOUT; 830 SHOUT = fp; 831 dumphist[2] = hbuf; 832 dohist(dumphist, NULL); 833 SHOUT = ftmp; 834 (void) close(fp); 835 didfds = oldidfds; 836 } 837 } 838 839 void 840 goodbye() 841 { 842 rechist(); 843 844 if (loginsh) { 845 (void) signal(SIGQUIT, SIG_IGN); 846 (void) signal(SIGINT, SIG_IGN); 847 (void) signal(SIGTERM, SIG_IGN); 848 setintr = 0; /* No interrupts after "logout" */ 849 if (!(adrof(STRlogout))) 850 set(STRlogout, STRnormal); 851 #ifdef _PATH_DOTLOGOUT 852 (void) srcfile(_PATH_DOTLOGOUT, 0, 0); 853 #endif 854 if (adrof(STRhome)) 855 (void) srccat(value(STRhome), STRsldtlogout); 856 } 857 exitstat(); 858 } 859 860 void 861 exitstat() 862 { 863 Char *s; 864 #ifdef PROF 865 monitor(0); 866 #endif 867 /* 868 * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit 869 * directly because we poke child here. Otherwise we might continue 870 * unwarrantedly (sic). 871 */ 872 child = 1; 873 s = value(STRstatus); 874 xexit(s ? getn(s) : 0); 875 } 876 877 /* 878 * in the event of a HUP we want to save the history 879 */ 880 static void 881 phup(sig) 882 int sig; 883 { 884 rechist(); 885 886 /* 887 * We kill the last foreground process group. It then becomes 888 * responsible to propagate the SIGHUP to its progeny. 889 */ 890 { 891 struct process *pp, *np; 892 893 for (pp = proclist.p_next; pp; pp = pp->p_next) { 894 np = pp; 895 /* 896 * Find if this job is in the foreground. It could be that 897 * the process leader has exited and the foreground flag 898 * is cleared for it. 899 */ 900 do 901 /* 902 * If a process is in the foreground; we try to kill 903 * it's process group. If we succeed, then the 904 * whole job is gone. Otherwise we keep going... 905 * But avoid sending HUP to the shell again. 906 */ 907 if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp && 908 kill(-np->p_jobid, SIGHUP) != -1) { 909 /* In case the job was suspended... */ 910 (void) kill(-np->p_jobid, SIGCONT); 911 break; 912 } 913 while ((np = np->p_friends) != pp); 914 } 915 } 916 xexit(sig); 917 } 918 919 Char *jobargv[2] = {STRjobs, 0}; 920 921 /* 922 * Catch an interrupt, e.g. during lexical input. 923 * If we are an interactive shell, we reset the interrupt catch 924 * immediately. In any case we drain the shell output, 925 * and finally go through the normal error mechanism, which 926 * gets a chance to make the shell go away. 927 */ 928 /* ARGSUSED */ 929 void 930 pintr(notused) 931 int notused; 932 { 933 pintr1(1); 934 } 935 936 void 937 pintr1(wantnl) 938 bool wantnl; 939 { 940 Char **v; 941 sigset_t sigset, osigset; 942 943 sigemptyset(&sigset); 944 sigprocmask(SIG_BLOCK, &sigset, &osigset); 945 if (setintr) { 946 sigset = osigset; 947 sigdelset(&sigset, SIGINT); 948 sigprocmask(SIG_SETMASK, &sigset, NULL); 949 if (pjobs) { 950 pjobs = 0; 951 (void) fprintf(cshout, "\n"); 952 dojobs(jobargv, NULL); 953 stderror(ERR_NAME | ERR_INTR); 954 } 955 } 956 sigdelset(&osigset, SIGCHLD); 957 sigprocmask(SIG_SETMASK, &osigset, NULL); 958 (void) fpurge(cshout); 959 (void) endpwent(); 960 961 /* 962 * If we have an active "onintr" then we search for the label. Note that if 963 * one does "onintr -" then we shan't be interruptible so we needn't worry 964 * about that here. 965 */ 966 if (gointr) { 967 gotolab(gointr); 968 timflg = 0; 969 if ((v = pargv) != NULL) 970 pargv = 0, blkfree(v); 971 if ((v = gargv) != NULL) 972 gargv = 0, blkfree(v); 973 reset(); 974 } 975 else if (intty && wantnl) { 976 (void) fputc('\r', cshout); 977 (void) fputc('\n', cshout); 978 } 979 stderror(ERR_SILENT); 980 } 981 982 /* 983 * Process is the main driving routine for the shell. 984 * It runs all command processing, except for those within { ... } 985 * in expressions (which is run by a routine evalav in sh.exp.c which 986 * is a stripped down process), and `...` evaluation which is run 987 * also by a subset of this code in sh.glob.c in the routine backeval. 988 * 989 * The code here is a little strange because part of it is interruptible 990 * and hence freeing of structures appears to occur when none is necessary 991 * if this is ignored. 992 * 993 * Note that if catch is not set then we will unwind on any error. 994 * If an end-of-file occurs, we return. 995 */ 996 static struct command *savet = NULL; 997 void 998 process(catch) 999 bool catch; 1000 { 1001 jmp_buf osetexit; 1002 struct command *t = savet; 1003 sigset_t sigset; 1004 1005 savet = NULL; 1006 getexit(osetexit); 1007 for (;;) { 1008 pendjob(); 1009 paraml.next = paraml.prev = ¶ml; 1010 paraml.word = STRNULL; 1011 (void) setexit(); 1012 justpr = enterhist; /* execute if not entering history */ 1013 1014 /* 1015 * Interruptible during interactive reads 1016 */ 1017 if (setintr) { 1018 sigemptyset(&sigset); 1019 sigaddset(&sigset, SIGINT); 1020 sigprocmask(SIG_UNBLOCK, &sigset, NULL); 1021 } 1022 1023 /* 1024 * For the sake of reset() 1025 */ 1026 freelex(¶ml); 1027 if (savet) 1028 freesyn(savet), savet = NULL; 1029 1030 if (haderr) { 1031 if (!catch) { 1032 /* unwind */ 1033 doneinp = 0; 1034 resexit(osetexit); 1035 savet = t; 1036 reset(); 1037 } 1038 haderr = 0; 1039 /* 1040 * Every error is eventually caught here or the shell dies. It is 1041 * at this point that we clean up any left-over open files, by 1042 * closing all but a fixed number of pre-defined files. Thus 1043 * routines don't have to worry about leaving files open due to 1044 * deeper errors... they will get closed here. 1045 */ 1046 closem(); 1047 continue; 1048 } 1049 if (doneinp) { 1050 doneinp = 0; 1051 break; 1052 } 1053 if (chkstop) 1054 chkstop--; 1055 if (neednote) 1056 pnote(); 1057 if (intty && prompt && evalvec == 0) { 1058 mailchk(); 1059 /* 1060 * If we are at the end of the input buffer then we are going to 1061 * read fresh stuff. Otherwise, we are rereading input and don't 1062 * need or want to prompt. 1063 */ 1064 if (aret == F_SEEK && fseekp == feobp) 1065 printprompt(); 1066 (void) fflush(cshout); 1067 } 1068 if (seterr) { 1069 xfree((ptr_t) seterr); 1070 seterr = NULL; 1071 } 1072 1073 /* 1074 * Echo not only on VERBOSE, but also with history expansion. If there 1075 * is a lexical error then we forego history echo. 1076 */ 1077 if ((lex(¶ml) && !seterr && intty) || adrof(STRverbose)) { 1078 prlex(csherr, ¶ml); 1079 } 1080 1081 /* 1082 * The parser may lose space if interrupted. 1083 */ 1084 if (setintr) 1085 sigprocmask(SIG_BLOCK, &sigset, NULL); 1086 1087 /* 1088 * Save input text on the history list if reading in old history, or it 1089 * is from the terminal at the top level and not in a loop. 1090 * 1091 * PWP: entry of items in the history list while in a while loop is done 1092 * elsewhere... 1093 */ 1094 if (enterhist || (catch && intty && !whyles)) 1095 savehist(¶ml); 1096 1097 /* 1098 * Print lexical error messages, except when sourcing history lists. 1099 */ 1100 if (!enterhist && seterr) 1101 stderror(ERR_OLD); 1102 1103 /* 1104 * If had a history command :p modifier then this is as far as we 1105 * should go 1106 */ 1107 if (justpr) 1108 reset(); 1109 1110 alias(¶ml); 1111 1112 /* 1113 * Parse the words of the input into a parse tree. 1114 */ 1115 savet = syntax(paraml.next, ¶ml, 0); 1116 if (seterr) 1117 stderror(ERR_OLD); 1118 1119 execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); 1120 1121 /* 1122 * Made it! 1123 */ 1124 freelex(¶ml); 1125 freesyn((struct command *) savet), savet = NULL; 1126 } 1127 resexit(osetexit); 1128 savet = t; 1129 } 1130 1131 void 1132 /*ARGSUSED*/ 1133 dosource(v, t) 1134 Char **v; 1135 struct command *t; 1136 1137 { 1138 Char *f; 1139 bool hflg = 0; 1140 Char buf[BUFSIZ]; 1141 1142 v++; 1143 if (*v && eq(*v, STRmh)) { 1144 if (*++v == NULL) 1145 stderror(ERR_NAME | ERR_HFLAG); 1146 hflg++; 1147 } 1148 (void) Strcpy(buf, *v); 1149 f = globone(buf, G_ERROR); 1150 (void) strcpy((char *) buf, short2str(f)); 1151 xfree((ptr_t) f); 1152 if (!srcfile((char *) buf, 0, hflg) && !hflg) 1153 stderror(ERR_SYSTEM, (char *) buf, strerror(errno)); 1154 } 1155 1156 /* 1157 * Check for mail. 1158 * If we are a login shell, then we don't want to tell 1159 * about any mail file unless its been modified 1160 * after the time we started. 1161 * This prevents us from telling the user things he already 1162 * knows, since the login program insists on saying 1163 * "You have mail." 1164 */ 1165 static void 1166 mailchk() 1167 { 1168 struct varent *v; 1169 Char **vp; 1170 time_t t; 1171 int intvl, cnt; 1172 struct stat stb; 1173 bool new; 1174 1175 v = adrof(STRmail); 1176 if (v == 0) 1177 return; 1178 (void) time(&t); 1179 vp = v->vec; 1180 cnt = blklen(vp); 1181 intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; 1182 if (intvl < 1) 1183 intvl = 1; 1184 if (chktim + intvl > t) 1185 return; 1186 for (; *vp; vp++) { 1187 if (stat(short2str(*vp), &stb) < 0) 1188 continue; 1189 new = stb.st_mtime > time0.tv_sec; 1190 if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || 1191 (stb.st_atime < chktim && stb.st_mtime < chktim) || 1192 (loginsh && !new)) 1193 continue; 1194 if (cnt == 1) 1195 (void) fprintf(cshout, "You have %smail.\n", new ? "new " : ""); 1196 else 1197 (void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail", 1198 vis_str(*vp)); 1199 } 1200 chktim = t; 1201 } 1202 1203 /* 1204 * Extract a home directory from the password file 1205 * The argument points to a buffer where the name of the 1206 * user whose home directory is sought is currently. 1207 * We write the home directory of the user back there. 1208 */ 1209 int 1210 gethdir(home) 1211 Char *home; 1212 { 1213 Char *h; 1214 struct passwd *pw; 1215 1216 /* 1217 * Is it us? 1218 */ 1219 if (*home == '\0') { 1220 if ((h = value(STRhome)) != NULL) { 1221 (void) Strcpy(home, h); 1222 return 0; 1223 } 1224 else 1225 return 1; 1226 } 1227 1228 if ((pw = getpwnam(short2str(home))) != NULL) { 1229 (void) Strcpy(home, str2short(pw->pw_dir)); 1230 return 0; 1231 } 1232 else 1233 return 1; 1234 } 1235 1236 /* 1237 * When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17 1238 * We also check if the shell has already changed the decriptor to point to 1239 * 0, 1, 2 when didfds is set. 1240 */ 1241 #define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0)) 1242 1243 static int 1244 readf(oreo, buf, siz) 1245 void *oreo; 1246 char *buf; 1247 int siz; 1248 { 1249 return read(DESC(oreo), buf, siz); 1250 } 1251 1252 1253 static int 1254 writef(oreo, buf, siz) 1255 void *oreo; 1256 const char *buf; 1257 int siz; 1258 { 1259 return write(DESC(oreo), buf, siz); 1260 } 1261 1262 static fpos_t 1263 seekf(oreo, off, whence) 1264 void *oreo; 1265 fpos_t off; 1266 int whence; 1267 { 1268 return lseek(DESC(oreo), off, whence); 1269 } 1270 1271 1272 static int 1273 closef(oreo) 1274 void *oreo; 1275 { 1276 return close(DESC(oreo)); 1277 } 1278 1279 1280 /* 1281 * Print the visible version of a string. 1282 */ 1283 int 1284 vis_fputc(ch, fp) 1285 int ch; 1286 FILE *fp; 1287 { 1288 char uenc[5]; /* 4 + NULL */ 1289 1290 if (ch & QUOTE) 1291 return fputc(ch & TRIM, fp); 1292 /* 1293 * XXX: When we are in AsciiOnly we want all characters >= 0200 to 1294 * be encoded, but currently there is no way in vis to do that. 1295 */ 1296 (void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0); 1297 return fputs(uenc, fp); 1298 } 1299 1300 /* 1301 * Move the initial descriptors to their eventual 1302 * resting places, closin all other units. 1303 */ 1304 void 1305 initdesc() 1306 { 1307 1308 didfds = 0; /* 0, 1, 2 aren't set up */ 1309 (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); 1310 (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); 1311 (void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL); 1312 (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); 1313 closem(); 1314 } 1315 1316 1317 void 1318 #ifdef PROF 1319 done(i) 1320 #else 1321 xexit(i) 1322 #endif 1323 int i; 1324 { 1325 untty(); 1326 _exit(i); 1327 } 1328 1329 static Char ** 1330 defaultpath() 1331 { 1332 char *ptr; 1333 Char **blk, **blkp; 1334 struct stat stb; 1335 1336 blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10); 1337 1338 #define DIRAPPEND(a) \ 1339 if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \ 1340 *blkp++ = SAVE(ptr) 1341 1342 DIRAPPEND(_PATH_BIN); 1343 DIRAPPEND(_PATH_USRBIN); 1344 1345 #undef DIRAPPEND 1346 1347 #if 0 1348 if (euid != 0 && uid != 0) 1349 *blkp++ = Strsave(STRdot); 1350 #endif 1351 1352 *blkp = NULL; 1353 return (blk); 1354 } 1355 1356 void 1357 printprompt() 1358 { 1359 Char *cp; 1360 1361 if (!whyles) { 1362 for (cp = value(STRprompt); *cp; cp++) 1363 if (*cp == HIST) 1364 (void) fprintf(cshout, "%d", eventno + 1); 1365 else { 1366 if (*cp == '\\' && cp[1] == HIST) 1367 cp++; 1368 (void) vis_fputc(*cp | QUOTE, cshout); 1369 } 1370 } 1371 else 1372 /* 1373 * Prompt for forward reading loop body content. 1374 */ 1375 (void) fprintf(cshout, "? "); 1376 (void) fflush(cshout); 1377 } 1378