1 /* $NetBSD: csh.c,v 1.24 1998/07/28 11:41:41 mycroft 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 1.24 1998/07/28 11:41:41 mycroft 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 <time.h> 59 #include <locale.h> 60 #include <unistd.h> 61 #include <vis.h> 62 #include <paths.h> /* should this be included in pathnames.h instead? */ 63 #if __STDC__ 64 # include <stdarg.h> 65 #else 66 # include <varargs.h> 67 #endif 68 69 #include "csh.h" 70 #include "proc.h" 71 #include "extern.h" 72 #include "pathnames.h" 73 74 /* 75 * C Shell 76 * 77 * Bill Joy, UC Berkeley, California, USA 78 * October 1978, May 1980 79 * 80 * Jim Kulp, IIASA, Laxenburg, Austria 81 * April 1980 82 * 83 * Christos Zoulas, Cornell University 84 * June, 1991 85 */ 86 87 Char *dumphist[] = {STRhistory, STRmh, 0, 0}; 88 Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0}; 89 90 int nofile = 0; 91 bool reenter = 0; 92 bool nverbose = 0; 93 bool nexececho = 0; 94 bool quitit = 0; 95 bool fast = 0; 96 bool batch = 0; 97 bool mflag = 0; 98 bool prompt = 1; 99 bool enterhist = 0; 100 101 extern char **environ; 102 103 static int readf __P((void *, char *, int)); 104 static fpos_t seekf __P((void *, fpos_t, int)); 105 static int writef __P((void *, const char *, int)); 106 static int closef __P((void *)); 107 static int srccat __P((Char *, Char *)); 108 static int srcfile __P((char *, bool, bool)); 109 static void phup __P((int)); 110 static void srcunit __P((int, bool, bool)); 111 static void mailchk __P((void)); 112 #ifndef _PATH_DEFPATH 113 static Char **defaultpath __P((void)); 114 #endif 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 const char *ecp; 126 int f; 127 char **tempv; 128 struct sigaction oact; 129 sigset_t sigset; 130 131 cshin = stdin; 132 cshout = stdout; 133 csherr = stderr; 134 135 settimes(); /* Immed. estab. timing base */ 136 137 /* 138 * Initialize non constant strings 139 */ 140 #ifdef _PATH_BSHELL 141 STR_BSHELL = SAVE(_PATH_BSHELL); 142 #endif 143 #ifdef _PATH_CSHELL 144 STR_SHELLPATH = SAVE(_PATH_CSHELL); 145 #endif 146 STR_environ = blk2short(environ); 147 environ = short2blk(STR_environ); /* So that we can free it */ 148 STR_WORD_CHARS = SAVE(WORD_CHARS); 149 150 HIST = '!'; 151 HISTSUB = '^'; 152 word_chars = STR_WORD_CHARS; 153 154 tempv = argv; 155 if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ 156 quitit = 1; 157 uid = getuid(); 158 gid = getgid(); 159 euid = geteuid(); 160 egid = getegid(); 161 /* 162 * We are a login shell if: 1. we were invoked as -<something> and we had 163 * no arguments 2. or we were invoked only with the -l flag 164 */ 165 loginsh = (**tempv == '-' && argc == 1) || 166 (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && 167 tempv[1][2] == '\0'); 168 169 if (loginsh && **tempv != '-') { 170 /* 171 * Mangle the argv space 172 */ 173 tempv[1][0] = '\0'; 174 tempv[1][1] = '\0'; 175 tempv[1] = NULL; 176 for (tcp = *tempv; *tcp++;) 177 continue; 178 for (tcp--; tcp >= *tempv; tcp--) 179 tcp[1] = tcp[0]; 180 *++tcp = '-'; 181 argc--; 182 } 183 if (loginsh) 184 (void) time(&chktim); 185 186 AsciiOnly = 1; 187 #ifdef NLS 188 (void) setlocale(LC_ALL, ""); 189 { 190 int k; 191 192 for (k = 0200; k <= 0377 && !Isprint(k); k++) 193 continue; 194 AsciiOnly = k > 0377; 195 } 196 #else 197 AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL; 198 #endif /* NLS */ 199 200 /* 201 * Move the descriptors to safe places. The variable didfds is 0 while we 202 * have only FSH* to work with. When didfds is true, we have 0,1,2 and 203 * prefer to use these. 204 */ 205 initdesc(); 206 /* 207 * XXX: This is to keep programs that use stdio happy. 208 * what we really want is freunopen() .... 209 * Closing cshin cshout and csherr (which are really stdin stdout 210 * and stderr at this point and then reopening them in the same order 211 * gives us again stdin == cshin stdout == cshout and stderr == csherr. 212 * If that was not the case builtins like printf that use stdio 213 * would break. But in any case we could fix that with memcpy and 214 * a bit of pointer manipulation... 215 * Fortunately this is not needed under the current implementation 216 * of stdio. 217 */ 218 (void) fclose(cshin); 219 (void) fclose(cshout); 220 (void) fclose(csherr); 221 if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef))) 222 exit(1); 223 if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef))) 224 exit(1); 225 if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef))) 226 exit(1); 227 (void) setvbuf(cshin, NULL, _IOLBF, 0); 228 (void) setvbuf(cshout, NULL, _IOLBF, 0); 229 (void) setvbuf(csherr, NULL, _IOLBF, 0); 230 231 /* 232 * Initialize the shell variables. ARGV and PROMPT are initialized later. 233 * STATUS is also munged in several places. CHILD is munged when 234 * forking/waiting 235 */ 236 set(STRstatus, Strsave(STR0)); 237 238 if ((ecp = getenv("HOME")) != NULL) 239 cp = quote(SAVE(ecp)); 240 else 241 cp = NULL; 242 243 if (cp == NULL) 244 fast = 1; /* No home -> can't read scripts */ 245 else 246 set(STRhome, cp); 247 dinit(cp); /* dinit thinks that HOME == cwd in a login 248 * shell */ 249 /* 250 * Grab other useful things from the environment. Should we grab 251 * everything?? 252 */ 253 if ((ecp = getenv("LOGNAME")) != NULL || 254 (ecp = getenv("USER")) != NULL) 255 set(STRuser, quote(SAVE(ecp))); 256 if ((ecp = getenv("TERM")) != NULL) 257 set(STRterm, quote(SAVE(ecp))); 258 259 /* 260 * Re-initialize path if set in environment 261 */ 262 if ((ecp = getenv("PATH")) == NULL) { 263 #ifdef _PATH_DEFPATH 264 importpath(SAVE(_PATH_DEFPATH)); 265 #else 266 setq(STRpath, defaultpath(), &shvhed); 267 #endif 268 } else { 269 importpath(SAVE(ecp)); 270 } 271 272 set(STRshell, Strsave(STR_SHELLPATH)); 273 274 doldol = putn((int) getpid()); /* For $$ */ 275 shtemp = Strspl(STRtmpsh, doldol); /* For << */ 276 277 /* 278 * Record the interrupt states from the parent process. If the parent is 279 * non-interruptible our hand must be forced or we (and our children) won't 280 * be either. Our children inherit termination from our parent. We catch it 281 * only if we are the login shell. 282 */ 283 /* parents interruptibility */ 284 (void) sigaction(SIGINT, NULL, &oact); 285 parintr = oact.sa_handler; 286 (void) sigaction(SIGTERM, NULL, &oact); 287 parterm = oact.sa_handler; 288 289 /* catch these all, login shell or not */ 290 (void) signal(SIGHUP, phup); /* exit processing on HUP */ 291 (void) signal(SIGXCPU, phup); /* ...and on XCPU */ 292 (void) signal(SIGXFSZ, phup); /* ...and on XFSZ */ 293 294 /* 295 * Process the arguments. 296 * 297 * Note that processing of -v/-x is actually delayed till after script 298 * processing. 299 * 300 * We set the first character of our name to be '-' if we are a shell 301 * running interruptible commands. Many programs which examine ps'es 302 * use this to filter such shells out. 303 */ 304 argc--, tempv++; 305 while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { 306 do 307 switch (*tcp++) { 308 309 case 0: /* - Interruptible, no prompt */ 310 prompt = 0; 311 setintr = 1; 312 nofile = 1; 313 break; 314 315 case 'b': /* -b Next arg is input file */ 316 batch = 1; 317 break; 318 319 case 'c': /* -c Command input from arg */ 320 if (argc == 1) 321 xexit(0); 322 argc--, tempv++; 323 arginp = SAVE(tempv[0]); 324 prompt = 0; 325 nofile = 1; 326 break; 327 328 case 'e': /* -e Exit on any error */ 329 exiterr = 1; 330 break; 331 332 case 'f': /* -f Fast start */ 333 fast = 1; 334 break; 335 336 case 'i': /* -i Interactive, even if !intty */ 337 intact = 1; 338 nofile = 1; 339 break; 340 341 case 'm': /* -m read .cshrc (from su) */ 342 mflag = 1; 343 break; 344 345 case 'n': /* -n Don't execute */ 346 noexec = 1; 347 break; 348 349 case 'q': /* -q (Undoc'd) ... die on quit */ 350 quitit = 1; 351 break; 352 353 case 's': /* -s Read from std input */ 354 nofile = 1; 355 break; 356 357 case 't': /* -t Read one line from input */ 358 onelflg = 2; 359 prompt = 0; 360 nofile = 1; 361 break; 362 363 case 'v': /* -v Echo hist expanded input */ 364 nverbose = 1; /* ... later */ 365 break; 366 367 case 'x': /* -x Echo just before execution */ 368 nexececho = 1; /* ... later */ 369 break; 370 371 case 'V': /* -V Echo hist expanded input */ 372 setNS(STRverbose); /* NOW! */ 373 break; 374 375 case 'X': /* -X Echo just before execution */ 376 setNS(STRecho); /* NOW! */ 377 break; 378 379 } while (*tcp); 380 tempv++, argc--; 381 } 382 383 if (quitit) /* With all due haste, for debugging */ 384 (void) signal(SIGQUIT, SIG_DFL); 385 386 /* 387 * Unless prevented by -, -c, -i, -s, or -t, if there are remaining 388 * arguments the first of them is the name of a shell file from which to 389 * read commands. 390 */ 391 if (nofile == 0 && argc > 0) { 392 nofile = open(tempv[0], O_RDONLY); 393 if (nofile < 0) { 394 child = 1; /* So this doesn't return */ 395 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 396 } 397 ffile = SAVE(tempv[0]); 398 /* 399 * Replace FSHIN. Handle /dev/std{in,out,err} specially 400 * since once they are closed we cannot open them again. 401 * In that case we use our own saved descriptors 402 */ 403 if ((SHIN = dmove(nofile, FSHIN)) < 0) 404 switch(nofile) { 405 case 0: 406 SHIN = FSHIN; 407 break; 408 case 1: 409 SHIN = FSHOUT; 410 break; 411 case 2: 412 SHIN = FSHERR; 413 break; 414 default: 415 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 416 /* NOTREACHED */ 417 } 418 (void) ioctl(SHIN, FIOCLEX, NULL); 419 prompt = 0; 420 /* argc not used any more */ tempv++; 421 } 422 423 intty = isatty(SHIN); 424 intty |= intact; 425 if (intty || (intact && isatty(SHOUT))) { 426 if (!batch && (uid != euid || gid != egid)) { 427 errno = EACCES; 428 child = 1; /* So this doesn't return */ 429 stderror(ERR_SYSTEM, "csh", strerror(errno)); 430 } 431 } 432 /* 433 * Decide whether we should play with signals or not. If we are explicitly 434 * told (via -i, or -) or we are a login shell (arg0 starts with -) or the 435 * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") 436 * Note that in only the login shell is it likely that parent may have set 437 * signals to be ignored 438 */ 439 if (loginsh || intact || (intty && isatty(SHOUT))) 440 setintr = 1; 441 settell(); 442 /* 443 * Save the remaining arguments in argv. 444 */ 445 setq(STRargv, blk2short(tempv), &shvhed); 446 447 /* 448 * Set up the prompt. 449 */ 450 if (prompt) { 451 set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); 452 /* that's a meta-questionmark */ 453 set(STRprompt2, Strsave(STRmquestion)); 454 } 455 456 /* 457 * If we are an interactive shell, then start fiddling with the signals; 458 * this is a tricky game. 459 */ 460 shpgrp = getpgrp(); 461 opgrp = tpgrp = -1; 462 if (setintr) { 463 **argv = '-'; 464 if (!quitit) /* Wary! */ 465 (void) signal(SIGQUIT, SIG_IGN); 466 (void) signal(SIGINT, pintr); 467 sigemptyset(&sigset); 468 (void) sigaddset(&sigset, SIGINT); 469 (void) sigprocmask(SIG_BLOCK, &sigset, NULL); 470 (void) signal(SIGTERM, SIG_IGN); 471 if (quitit == 0 && arginp == 0) { 472 (void) signal(SIGTSTP, SIG_IGN); 473 (void) signal(SIGTTIN, SIG_IGN); 474 (void) signal(SIGTTOU, SIG_IGN); 475 /* 476 * Wait till in foreground, in case someone stupidly runs csh & 477 * dont want to try to grab away the tty. 478 */ 479 if (isatty(FSHERR)) 480 f = FSHERR; 481 else if (isatty(FSHOUT)) 482 f = FSHOUT; 483 else if (isatty(OLDSTD)) 484 f = OLDSTD; 485 else 486 f = -1; 487 retry: 488 if ((tpgrp = tcgetpgrp(f)) != -1) { 489 if (tpgrp != shpgrp) { 490 sig_t old = signal(SIGTTIN, SIG_DFL); 491 (void) kill(0, SIGTTIN); 492 (void) signal(SIGTTIN, old); 493 goto retry; 494 } 495 opgrp = shpgrp; 496 shpgrp = getpid(); 497 tpgrp = shpgrp; 498 /* 499 * Setpgid will fail if we are a session leader and 500 * mypid == mypgrp (POSIX 4.3.3) 501 */ 502 if (opgrp != shpgrp) 503 if (setpgid(0, shpgrp) == -1) 504 goto notty; 505 /* 506 * We do that after we set our process group, to make sure 507 * that the process group belongs to a process in the same 508 * session as the tty (our process and our group) (POSIX 7.2.4) 509 */ 510 if (tcsetpgrp(f, shpgrp) == -1) 511 goto notty; 512 (void) ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); 513 } 514 if (tpgrp == -1) { 515 notty: 516 (void) fprintf(csherr, "Warning: no access to tty (%s).\n", 517 strerror(errno)); 518 (void) fprintf(csherr, "Thus no job control in this shell.\n"); 519 } 520 } 521 } 522 if ((setintr == 0) && (parintr == SIG_DFL)) 523 setintr = 1; 524 (void) signal(SIGCHLD, pchild); /* while signals not ready */ 525 526 /* 527 * Set an exit here in case of an interrupt or error reading the shell 528 * start-up scripts. 529 */ 530 reenter = setexit(); /* PWP */ 531 haderr = 0; /* In case second time through */ 532 if (!fast && reenter == 0) { 533 /* Will have value(STRhome) here because set fast if don't */ 534 { 535 int osetintr = setintr; 536 sig_t oparintr = parintr; 537 sigset_t osigset; 538 539 sigemptyset(&sigset); 540 (void) sigaddset(&sigset, SIGINT); 541 (void) sigprocmask(SIG_BLOCK, &sigset, &osigset); 542 543 setintr = 0; 544 parintr = SIG_IGN; /* Disable onintr */ 545 #ifdef _PATH_DOTCSHRC 546 (void) srcfile(_PATH_DOTCSHRC, 0, 0); 547 #endif 548 if (!fast && !arginp && !onelflg) 549 dohash(NULL, NULL); 550 #ifdef _PATH_DOTLOGIN 551 if (loginsh) 552 (void) srcfile(_PATH_DOTLOGIN, 0, 0); 553 #endif 554 (void) sigprocmask(SIG_SETMASK, &osigset, NULL); 555 setintr = osetintr; 556 parintr = oparintr; 557 } 558 (void) srccat(value(STRhome), STRsldotcshrc); 559 560 if (!fast && !arginp && !onelflg && !havhash) 561 dohash(NULL, NULL); 562 /* 563 * Source history before .login so that it is available in .login 564 */ 565 if ((cp = value(STRhistfile)) != STRNULL) 566 loadhist[2] = cp; 567 dosource(loadhist, NULL); 568 if (loginsh) 569 (void) srccat(value(STRhome), STRsldotlogin); 570 } 571 572 /* 573 * Now are ready for the -v and -x flags 574 */ 575 if (nverbose) 576 setNS(STRverbose); 577 if (nexececho) 578 setNS(STRecho); 579 580 /* 581 * All the rest of the world is inside this call. The argument to process 582 * indicates whether it should catch "error unwinds". Thus if we are a 583 * interactive shell our call here will never return by being blown past on 584 * an error. 585 */ 586 process(setintr); 587 588 /* 589 * Mop-up. 590 */ 591 if (intty) { 592 if (loginsh) { 593 (void) fprintf(cshout, "logout\n"); 594 (void) close(SHIN); 595 child = 1; 596 goodbye(); 597 } 598 else { 599 (void) fprintf(cshout, "exit\n"); 600 } 601 } 602 rechist(); 603 exitstat(); 604 /* NOTREACHED */ 605 } 606 607 void 608 untty() 609 { 610 if (tpgrp > 0) { 611 (void) setpgid(0, opgrp); 612 (void) tcsetpgrp(FSHTTY, opgrp); 613 } 614 } 615 616 void 617 importpath(cp) 618 Char *cp; 619 { 620 int i = 0; 621 Char *dp; 622 Char **pv; 623 int c; 624 625 for (dp = cp; *dp; dp++) 626 if (*dp == ':') 627 i++; 628 /* 629 * i+2 where i is the number of colons in the path. There are i+1 630 * directories in the path plus we need room for a zero terminator. 631 */ 632 pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char **)); 633 dp = cp; 634 i = 0; 635 if (*dp) 636 for (;;) { 637 if ((c = *dp) == ':' || c == 0) { 638 *dp = 0; 639 pv[i++] = Strsave(*cp ? cp : STRdot); 640 if (c) { 641 cp = dp + 1; 642 *dp = ':'; 643 } 644 else 645 break; 646 } 647 dp++; 648 } 649 pv[i] = 0; 650 set1(STRpath, pv, &shvhed); 651 } 652 653 /* 654 * Source to the file which is the catenation of the argument names. 655 */ 656 static int 657 srccat(cp, dp) 658 Char *cp, *dp; 659 { 660 Char *ep = Strspl(cp, dp); 661 char *ptr = short2str(ep); 662 663 xfree((ptr_t) ep); 664 return srcfile(ptr, mflag ? 0 : 1, 0); 665 } 666 667 /* 668 * Source to a file putting the file descriptor in a safe place (> 2). 669 */ 670 static int 671 srcfile(f, onlyown, flag) 672 char *f; 673 bool onlyown, flag; 674 { 675 int unit; 676 677 if ((unit = open(f, O_RDONLY)) == -1) 678 return 0; 679 unit = dmove(unit, -1); 680 681 (void) ioctl(unit, FIOCLEX, NULL); 682 srcunit(unit, onlyown, flag); 683 return 1; 684 } 685 686 /* 687 * Source to a unit. If onlyown it must be our file or our group or 688 * we don't chance it. This occurs on ".cshrc"s and the like. 689 */ 690 int insource; 691 static void 692 srcunit(unit, onlyown, hflg) 693 int unit; 694 bool onlyown, hflg; 695 { 696 /* We have to push down a lot of state here */ 697 /* All this could go into a structure */ 698 int oSHIN = -1, oldintty = intty, oinsource = insource; 699 struct whyle *oldwhyl = whyles; 700 Char *ogointr = gointr, *oarginp = arginp; 701 Char *oevalp = evalp, **oevalvec = evalvec; 702 int oonelflg = onelflg; 703 bool oenterhist = enterhist; 704 char OHIST = HIST; 705 bool otell = cantell; 706 707 struct Bin saveB; 708 sigset_t sigset, osigset; 709 jmp_buf oldexit; 710 711 /* The (few) real local variables */ 712 int my_reenter; 713 714 if (unit < 0) 715 return; 716 if (didfds) 717 donefds(); 718 if (onlyown) { 719 struct stat stb; 720 721 if (fstat(unit, &stb) < 0) { 722 (void) close(unit); 723 return; 724 } 725 } 726 727 /* 728 * There is a critical section here while we are pushing down the input 729 * stream since we have stuff in different structures. If we weren't 730 * careful an interrupt could corrupt SHIN's Bin structure and kill the 731 * shell. 732 * 733 * We could avoid the critical region by grouping all the stuff in a single 734 * structure and pointing at it to move it all at once. This is less 735 * efficient globally on many variable references however. 736 */ 737 insource = 1; 738 getexit(oldexit); 739 740 if (setintr) { 741 sigemptyset(&sigset); 742 (void) sigaddset(&sigset, SIGINT); 743 (void) sigprocmask(SIG_BLOCK, &sigset, &osigset); 744 } 745 /* Setup the new values of the state stuff saved above */ 746 (void) memcpy(&saveB, &B, sizeof(B)); 747 fbuf = NULL; 748 fseekp = feobp = fblocks = 0; 749 oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; 750 intty = isatty(SHIN), whyles = 0, gointr = 0; 751 evalvec = 0; 752 evalp = 0; 753 enterhist = hflg; 754 if (enterhist) 755 HIST = '\0'; 756 757 /* 758 * Now if we are allowing commands to be interrupted, we let ourselves be 759 * interrupted. 760 */ 761 if (setintr) 762 (void) sigprocmask(SIG_SETMASK, &osigset, NULL); 763 settell(); 764 765 if ((my_reenter = setexit()) == 0) 766 process(0); /* 0 -> blow away on errors */ 767 768 if (setintr) 769 (void) sigprocmask(SIG_SETMASK, &osigset, NULL); 770 if (oSHIN >= 0) { 771 int i; 772 773 /* We made it to the new state... free up its storage */ 774 /* This code could get run twice but xfree doesn't care */ 775 for (i = 0; i < fblocks; i++) 776 xfree((ptr_t) fbuf[i]); 777 xfree((ptr_t) fbuf); 778 779 /* Reset input arena */ 780 (void) memcpy(&B, &saveB, sizeof(B)); 781 782 (void) close(SHIN), SHIN = oSHIN; 783 arginp = oarginp, onelflg = oonelflg; 784 evalp = oevalp, evalvec = oevalvec; 785 intty = oldintty, whyles = oldwhyl, gointr = ogointr; 786 if (enterhist) 787 HIST = OHIST; 788 enterhist = oenterhist; 789 cantell = otell; 790 } 791 792 resexit(oldexit); 793 /* 794 * If process reset() (effectively an unwind) then we must also unwind. 795 */ 796 if (my_reenter) 797 stderror(ERR_SILENT); 798 insource = oinsource; 799 } 800 801 void 802 rechist() 803 { 804 Char buf[BUFSIZ], hbuf[BUFSIZ], *hfile; 805 int fp, ftmp, oldidfds; 806 struct varent *shist; 807 808 if (!fast) { 809 /* 810 * If $savehist is just set, we use the value of $history 811 * else we use the value in $savehist 812 */ 813 if ((shist = adrof(STRsavehist)) != NULL) { 814 if (shist->vec[0][0] != '\0') 815 (void) Strcpy(hbuf, shist->vec[0]); 816 else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0') 817 (void) Strcpy(hbuf, shist->vec[0]); 818 else 819 return; 820 } 821 else 822 return; 823 824 if ((hfile = value(STRhistfile)) == STRNULL) { 825 hfile = Strcpy(buf, value(STRhome)); 826 (void) Strcat(buf, STRsldthist); 827 } 828 829 if ((fp = open(short2str(hfile), O_WRONLY | O_CREAT | O_TRUNC, 830 0600)) == -1) 831 return; 832 833 oldidfds = didfds; 834 didfds = 0; 835 ftmp = SHOUT; 836 SHOUT = fp; 837 dumphist[2] = hbuf; 838 dohist(dumphist, NULL); 839 SHOUT = ftmp; 840 (void) close(fp); 841 didfds = oldidfds; 842 } 843 } 844 845 void 846 goodbye() 847 { 848 rechist(); 849 850 if (loginsh) { 851 (void) signal(SIGQUIT, SIG_IGN); 852 (void) signal(SIGINT, SIG_IGN); 853 (void) signal(SIGTERM, SIG_IGN); 854 setintr = 0; /* No interrupts after "logout" */ 855 if (!(adrof(STRlogout))) 856 set(STRlogout, STRnormal); 857 #ifdef _PATH_DOTLOGOUT 858 (void) srcfile(_PATH_DOTLOGOUT, 0, 0); 859 #endif 860 if (adrof(STRhome)) 861 (void) srccat(value(STRhome), STRsldtlogout); 862 } 863 exitstat(); 864 /* NOTREACHED */ 865 } 866 867 __dead void 868 exitstat() 869 { 870 Char *s; 871 #ifdef PROF 872 monitor(0); 873 #endif 874 /* 875 * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit 876 * directly because we poke child here. Otherwise we might continue 877 * unwarrantedly (sic). 878 */ 879 child = 1; 880 s = value(STRstatus); 881 xexit(s ? getn(s) : 0); 882 /* NOTREACHED */ 883 } 884 885 /* 886 * in the event of a HUP we want to save the history 887 */ 888 static void 889 phup(sig) 890 int sig; 891 { 892 rechist(); 893 894 /* 895 * We kill the last foreground process group. It then becomes 896 * responsible to propagate the SIGHUP to its progeny. 897 */ 898 { 899 struct process *pp, *np; 900 901 for (pp = proclist.p_next; pp; pp = pp->p_next) { 902 np = pp; 903 /* 904 * Find if this job is in the foreground. It could be that 905 * the process leader has exited and the foreground flag 906 * is cleared for it. 907 */ 908 do 909 /* 910 * If a process is in the foreground; we try to kill 911 * it's process group. If we succeed, then the 912 * whole job is gone. Otherwise we keep going... 913 * But avoid sending HUP to the shell again. 914 */ 915 if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp && 916 kill(-np->p_jobid, SIGHUP) != -1) { 917 /* In case the job was suspended... */ 918 (void) kill(-np->p_jobid, SIGCONT); 919 break; 920 } 921 while ((np = np->p_friends) != pp); 922 } 923 } 924 xexit(sig); 925 /* NOTREACHED */ 926 } 927 928 Char *jobargv[2] = {STRjobs, 0}; 929 930 /* 931 * Catch an interrupt, e.g. during lexical input. 932 * If we are an interactive shell, we reset the interrupt catch 933 * immediately. In any case we drain the shell output, 934 * and finally go through the normal error mechanism, which 935 * gets a chance to make the shell go away. 936 */ 937 /* ARGSUSED */ 938 void 939 pintr(notused) 940 int notused; 941 { 942 pintr1(1); 943 /* NOTREACHED */ 944 } 945 946 void 947 pintr1(wantnl) 948 bool wantnl; 949 { 950 Char **v; 951 sigset_t sigset, osigset; 952 953 sigemptyset(&sigset); 954 (void) sigprocmask(SIG_BLOCK, &sigset, &osigset); 955 if (setintr) { 956 sigset = osigset; 957 (void) sigdelset(&sigset, SIGINT); 958 (void) sigprocmask(SIG_SETMASK, &sigset, NULL); 959 if (pjobs) { 960 pjobs = 0; 961 (void) fprintf(cshout, "\n"); 962 dojobs(jobargv, NULL); 963 stderror(ERR_NAME | ERR_INTR); 964 } 965 } 966 (void) sigdelset(&osigset, SIGCHLD); 967 (void) sigprocmask(SIG_SETMASK, &osigset, NULL); 968 (void) fpurge(cshout); 969 (void) endpwent(); 970 971 /* 972 * If we have an active "onintr" then we search for the label. Note that if 973 * one does "onintr -" then we shan't be interruptible so we needn't worry 974 * about that here. 975 */ 976 if (gointr) { 977 gotolab(gointr); 978 timflg = 0; 979 if ((v = pargv) != NULL) 980 pargv = 0, blkfree(v); 981 if ((v = gargv) != NULL) 982 gargv = 0, blkfree(v); 983 reset(); 984 } 985 else if (intty && wantnl) { 986 (void) fputc('\r', cshout); 987 (void) fputc('\n', cshout); 988 } 989 stderror(ERR_SILENT); 990 /* NOTREACHED */ 991 } 992 993 /* 994 * Process is the main driving routine for the shell. 995 * It runs all command processing, except for those within { ... } 996 * in expressions (which is run by a routine evalav in sh.exp.c which 997 * is a stripped down process), and `...` evaluation which is run 998 * also by a subset of this code in sh.glob.c in the routine backeval. 999 * 1000 * The code here is a little strange because part of it is interruptible 1001 * and hence freeing of structures appears to occur when none is necessary 1002 * if this is ignored. 1003 * 1004 * Note that if catch is not set then we will unwind on any error. 1005 * If an end-of-file occurs, we return. 1006 */ 1007 static struct command *savet = NULL; 1008 void 1009 process(catch) 1010 bool catch; 1011 { 1012 jmp_buf osetexit; 1013 struct command *t = savet; 1014 sigset_t sigset; 1015 1016 savet = NULL; 1017 getexit(osetexit); 1018 for (;;) { 1019 pendjob(); 1020 paraml.next = paraml.prev = ¶ml; 1021 paraml.word = STRNULL; 1022 (void) setexit(); 1023 justpr = enterhist; /* execute if not entering history */ 1024 1025 /* 1026 * Interruptible during interactive reads 1027 */ 1028 if (setintr) { 1029 sigemptyset(&sigset); 1030 (void) sigaddset(&sigset, SIGINT); 1031 (void) sigprocmask(SIG_UNBLOCK, &sigset, NULL); 1032 } 1033 1034 /* 1035 * For the sake of reset() 1036 */ 1037 freelex(¶ml); 1038 if (savet) 1039 freesyn(savet), savet = NULL; 1040 1041 if (haderr) { 1042 if (!catch) { 1043 /* unwind */ 1044 doneinp = 0; 1045 resexit(osetexit); 1046 savet = t; 1047 reset(); 1048 } 1049 haderr = 0; 1050 /* 1051 * Every error is eventually caught here or the shell dies. It is 1052 * at this point that we clean up any left-over open files, by 1053 * closing all but a fixed number of pre-defined files. Thus 1054 * routines don't have to worry about leaving files open due to 1055 * deeper errors... they will get closed here. 1056 */ 1057 closem(); 1058 continue; 1059 } 1060 if (doneinp) { 1061 doneinp = 0; 1062 break; 1063 } 1064 if (chkstop) 1065 chkstop--; 1066 if (neednote) 1067 pnote(); 1068 if (intty && prompt && evalvec == 0) { 1069 mailchk(); 1070 /* 1071 * If we are at the end of the input buffer then we are going to 1072 * read fresh stuff. Otherwise, we are rereading input and don't 1073 * need or want to prompt. 1074 */ 1075 if (aret == F_SEEK && fseekp == feobp) 1076 printprompt(); 1077 (void) fflush(cshout); 1078 } 1079 if (seterr) { 1080 xfree((ptr_t) seterr); 1081 seterr = NULL; 1082 } 1083 1084 /* 1085 * Echo not only on VERBOSE, but also with history expansion. If there 1086 * is a lexical error then we forego history echo. 1087 */ 1088 if ((lex(¶ml) && !seterr && intty) || adrof(STRverbose)) { 1089 prlex(csherr, ¶ml); 1090 } 1091 1092 /* 1093 * The parser may lose space if interrupted. 1094 */ 1095 if (setintr) 1096 (void) sigprocmask(SIG_BLOCK, &sigset, NULL); 1097 1098 /* 1099 * Save input text on the history list if reading in old history, or it 1100 * is from the terminal at the top level and not in a loop. 1101 * 1102 * PWP: entry of items in the history list while in a while loop is done 1103 * elsewhere... 1104 */ 1105 if (enterhist || (catch && intty && !whyles)) 1106 savehist(¶ml); 1107 1108 /* 1109 * Print lexical error messages, except when sourcing history lists. 1110 */ 1111 if (!enterhist && seterr) 1112 stderror(ERR_OLD); 1113 1114 /* 1115 * If had a history command :p modifier then this is as far as we 1116 * should go 1117 */ 1118 if (justpr) 1119 reset(); 1120 1121 alias(¶ml); 1122 1123 /* 1124 * Parse the words of the input into a parse tree. 1125 */ 1126 savet = syntax(paraml.next, ¶ml, 0); 1127 if (seterr) 1128 stderror(ERR_OLD); 1129 1130 execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); 1131 1132 /* 1133 * Made it! 1134 */ 1135 freelex(¶ml); 1136 freesyn((struct command *) savet), savet = NULL; 1137 } 1138 resexit(osetexit); 1139 savet = t; 1140 } 1141 1142 void 1143 /*ARGSUSED*/ 1144 dosource(v, t) 1145 Char **v; 1146 struct command *t; 1147 1148 { 1149 Char *f; 1150 bool hflg = 0; 1151 Char buf[BUFSIZ]; 1152 1153 v++; 1154 if (*v && eq(*v, STRmh)) { 1155 if (*++v == NULL) 1156 stderror(ERR_NAME | ERR_HFLAG); 1157 hflg++; 1158 } 1159 (void) Strcpy(buf, *v); 1160 f = globone(buf, G_ERROR); 1161 (void) strcpy((char *) buf, short2str(f)); 1162 xfree((ptr_t) f); 1163 if (!srcfile((char *) buf, 0, hflg) && !hflg) 1164 stderror(ERR_SYSTEM, (char *) buf, strerror(errno)); 1165 } 1166 1167 /* 1168 * Check for mail. 1169 * If we are a login shell, then we don't want to tell 1170 * about any mail file unless its been modified 1171 * after the time we started. 1172 * This prevents us from telling the user things he already 1173 * knows, since the login program insists on saying 1174 * "You have mail." 1175 */ 1176 static void 1177 mailchk() 1178 { 1179 struct varent *v; 1180 Char **vp; 1181 time_t t; 1182 int intvl, cnt; 1183 struct stat stb; 1184 bool new; 1185 1186 v = adrof(STRmail); 1187 if (v == 0) 1188 return; 1189 (void) time(&t); 1190 vp = v->vec; 1191 cnt = blklen(vp); 1192 intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; 1193 if (intvl < 1) 1194 intvl = 1; 1195 if (chktim + intvl > t) 1196 return; 1197 for (; *vp; vp++) { 1198 if (stat(short2str(*vp), &stb) < 0) 1199 continue; 1200 new = stb.st_mtime > time0.tv_sec; 1201 if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || 1202 (stb.st_atime < chktim && stb.st_mtime < chktim) || 1203 (loginsh && !new)) 1204 continue; 1205 if (cnt == 1) 1206 (void) fprintf(cshout, "You have %smail.\n", new ? "new " : ""); 1207 else 1208 (void) fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail", 1209 vis_str(*vp)); 1210 } 1211 chktim = t; 1212 } 1213 1214 /* 1215 * Extract a home directory from the password file 1216 * The argument points to a buffer where the name of the 1217 * user whose home directory is sought is currently. 1218 * We write the home directory of the user back there. 1219 */ 1220 int 1221 gethdir(home) 1222 Char *home; 1223 { 1224 Char *h; 1225 struct passwd *pw; 1226 1227 /* 1228 * Is it us? 1229 */ 1230 if (*home == '\0') { 1231 if ((h = value(STRhome)) != NULL) { 1232 (void) Strcpy(home, h); 1233 return 0; 1234 } 1235 else 1236 return 1; 1237 } 1238 1239 if ((pw = getpwnam(short2str(home))) != NULL) { 1240 (void) Strcpy(home, str2short(pw->pw_dir)); 1241 return 0; 1242 } 1243 else 1244 return 1; 1245 } 1246 1247 /* 1248 * When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17 1249 * We also check if the shell has already changed the decriptor to point to 1250 * 0, 1, 2 when didfds is set. 1251 */ 1252 #define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0)) 1253 1254 static int 1255 readf(oreo, buf, siz) 1256 void *oreo; 1257 char *buf; 1258 int siz; 1259 { 1260 return read(DESC(oreo), buf, siz); 1261 } 1262 1263 1264 static int 1265 writef(oreo, buf, siz) 1266 void *oreo; 1267 const char *buf; 1268 int siz; 1269 { 1270 return write(DESC(oreo), buf, siz); 1271 } 1272 1273 static fpos_t 1274 seekf(oreo, off, whence) 1275 void *oreo; 1276 fpos_t off; 1277 int whence; 1278 { 1279 return lseek(DESC(oreo), off, whence); 1280 } 1281 1282 1283 static int 1284 closef(oreo) 1285 void *oreo; 1286 { 1287 return close(DESC(oreo)); 1288 } 1289 1290 1291 /* 1292 * Print the visible version of a string. 1293 */ 1294 int 1295 vis_fputc(ch, fp) 1296 int ch; 1297 FILE *fp; 1298 { 1299 char uenc[5]; /* 4 + NULL */ 1300 1301 if (ch & QUOTE) 1302 return fputc(ch & TRIM, fp); 1303 /* 1304 * XXX: When we are in AsciiOnly we want all characters >= 0200 to 1305 * be encoded, but currently there is no way in vis to do that. 1306 */ 1307 (void) vis(uenc, ch & TRIM, VIS_NOSLASH, 0); 1308 return fputs(uenc, fp); 1309 } 1310 1311 /* 1312 * Move the initial descriptors to their eventual 1313 * resting places, closin all other units. 1314 */ 1315 void 1316 initdesc() 1317 { 1318 1319 didfds = 0; /* 0, 1, 2 aren't set up */ 1320 (void) ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); 1321 (void) ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); 1322 (void) ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL); 1323 (void) ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); 1324 closem(); 1325 } 1326 1327 1328 __dead void 1329 #ifdef PROF 1330 done(i) 1331 #else 1332 xexit(i) 1333 #endif 1334 int i; 1335 { 1336 untty(); 1337 _exit(i); 1338 /* NOTREACHED */ 1339 } 1340 1341 #ifndef _PATH_DEFPATH 1342 static Char ** 1343 defaultpath() 1344 { 1345 char *ptr; 1346 Char **blk, **blkp; 1347 struct stat stb; 1348 1349 blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10); 1350 1351 #define DIRAPPEND(a) \ 1352 if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \ 1353 *blkp++ = SAVE(ptr) 1354 1355 DIRAPPEND(_PATH_BIN); 1356 DIRAPPEND(_PATH_USRBIN); 1357 1358 #undef DIRAPPEND 1359 1360 #if 0 1361 if (euid != 0 && uid != 0) 1362 *blkp++ = Strsave(STRdot); 1363 #endif 1364 1365 *blkp = NULL; 1366 return (blk); 1367 } 1368 #endif /* _PATH_DEFPATH */ 1369 1370 void 1371 printprompt() 1372 { 1373 Char *cp; 1374 1375 if (!whyles) { 1376 for (cp = value(STRprompt); *cp; cp++) 1377 if (*cp == HIST) 1378 (void) fprintf(cshout, "%d", eventno + 1); 1379 else { 1380 if (*cp == '\\' && cp[1] == HIST) 1381 cp++; 1382 (void) vis_fputc(*cp | QUOTE, cshout); 1383 } 1384 } 1385 else 1386 /* 1387 * Prompt for forward reading loop body content. 1388 */ 1389 (void) fprintf(cshout, "? "); 1390 (void) fflush(cshout); 1391 } 1392