1 /* $NetBSD: csh.c,v 1.46 2013/07/16 17:47:43 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)csh.c 8.2 (Berkeley) 10/12/93"; 41 #else 42 __RCSID("$NetBSD: csh.c,v 1.46 2013/07/16 17:47:43 christos Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <sys/ioctl.h> 48 #include <sys/stat.h> 49 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <locale.h> 53 #include <paths.h> /* should this be included in pathnames.h instead? */ 54 #include <pwd.h> 55 #include <stdarg.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 #include <vis.h> 61 62 #include "csh.h" 63 #include "extern.h" 64 #include "pathnames.h" 65 #include "proc.h" 66 67 /* 68 * C Shell 69 * 70 * Bill Joy, UC Berkeley, California, USA 71 * October 1978, May 1980 72 * 73 * Jim Kulp, IIASA, Laxenburg, Austria 74 * April 1980 75 * 76 * Christos Zoulas, Cornell University 77 * June, 1991 78 */ 79 80 Char *dumphist[] = {STRhistory, STRmh, 0, 0}; 81 Char *tildehist[] = {STRsource, STRmh, STRtildothist, 0}; 82 83 int nofile = 0; 84 int batch = 0; 85 int enterhist = 0; 86 int fast = 0; 87 int mflag = 0; 88 int nexececho = 0; 89 int nverbose = 0; 90 int prompt = 1; 91 int quitit = 0; 92 int reenter = 0; 93 94 extern char **environ; 95 96 static ssize_t readf(void *, void *, size_t); 97 static off_t seekf(void *, off_t, int); 98 static ssize_t writef(void *, const void *, size_t); 99 static int closef(void *); 100 static int srccat(Char *, Char *); 101 static int srcfile(const char *, int, int); 102 __dead static void phup(int); 103 static void srcunit(int, int, int); 104 static void mailchk(void); 105 #ifndef _PATH_DEFPATH 106 static Char **defaultpath(void); 107 #endif 108 #ifdef EDITING 109 int editing = 0; 110 #endif 111 112 int 113 main(int argc, char *argv[]) 114 { 115 struct sigaction oact; 116 Char *cp; 117 char *tcp, **tempv; 118 const char *ecp; 119 sigset_t nsigset; 120 int f; 121 122 cshin = stdin; 123 cshout = stdout; 124 csherr = stderr; 125 126 setprogname(argv[0]); 127 settimes(); /* Immed. estab. timing base */ 128 129 /* 130 * Initialize non constant strings 131 */ 132 #ifdef _PATH_BSHELL 133 STR_BSHELL = SAVE(_PATH_BSHELL); 134 #endif 135 #ifdef _PATH_CSHELL 136 STR_SHELLPATH = SAVE(_PATH_CSHELL); 137 #endif 138 STR_environ = blk2short(environ); 139 environ = short2blk(STR_environ); /* So that we can free it */ 140 STR_WORD_CHARS = SAVE(WORD_CHARS); 141 142 HIST = '!'; 143 HISTSUB = '^'; 144 word_chars = STR_WORD_CHARS; 145 146 tempv = argv; 147 if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */ 148 quitit = 1; 149 uid = getuid(); 150 gid = getgid(); 151 euid = geteuid(); 152 egid = getegid(); 153 /* 154 * We are a login shell if: 1. we were invoked as -<something> and we had 155 * no arguments 2. or we were invoked only with the -l flag 156 */ 157 loginsh = (**tempv == '-' && argc == 1) || 158 (argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' && 159 tempv[1][2] == '\0'); 160 161 if (loginsh && **tempv != '-') { 162 /* 163 * Mangle the argv space 164 */ 165 tempv[1][0] = '\0'; 166 tempv[1][1] = '\0'; 167 tempv[1] = NULL; 168 for (tcp = *tempv; *tcp++;) 169 continue; 170 for (tcp--; tcp >= *tempv; tcp--) 171 tcp[1] = tcp[0]; 172 *++tcp = '-'; 173 argc--; 174 } 175 if (loginsh) 176 (void)time(&chktim); 177 178 AsciiOnly = 1; 179 #ifdef NLS 180 (void)setlocale(LC_ALL, ""); 181 { 182 int k; 183 184 for (k = 0200; k <= 0377 && !Isprint(k); k++) 185 continue; 186 AsciiOnly = k > 0377; 187 } 188 #else 189 AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL; 190 #endif /* NLS */ 191 192 /* 193 * Move the descriptors to safe places. The variable didfds is 0 while we 194 * have only FSH* to work with. When didfds is true, we have 0,1,2 and 195 * prefer to use these. 196 */ 197 initdesc(); 198 /* 199 * XXX: This is to keep programs that use stdio happy. 200 * what we really want is freunopen() .... 201 * Closing cshin cshout and csherr (which are really stdin stdout 202 * and stderr at this point and then reopening them in the same order 203 * gives us again stdin == cshin stdout == cshout and stderr == csherr. 204 * If that was not the case builtins like printf that use stdio 205 * would break. But in any case we could fix that with memcpy and 206 * a bit of pointer manipulation... 207 * Fortunately this is not needed under the current implementation 208 * of stdio. 209 */ 210 (void)fclose(cshin); 211 (void)fclose(cshout); 212 (void)fclose(csherr); 213 if (!(cshin = funopen2((void *) &SHIN, readf, writef, seekf, NULL, 214 closef))) 215 exit(1); 216 if (!(cshout = funopen2((void *) &SHOUT, readf, writef, seekf, NULL, 217 closef))) 218 exit(1); 219 if (!(csherr = funopen2((void *) &SHERR, readf, writef, seekf, NULL, 220 closef))) 221 exit(1); 222 (void)setvbuf(cshin, NULL, _IOLBF, 0); 223 (void)setvbuf(cshout, NULL, _IOLBF, 0); 224 (void)setvbuf(csherr, NULL, _IOLBF, 0); 225 226 /* 227 * Initialize the shell variables. ARGV and PROMPT are initialized later. 228 * STATUS is also munged in several places. CHILD is munged when 229 * forking/waiting 230 */ 231 set(STRstatus, Strsave(STR0)); 232 233 if ((ecp = getenv("HOME")) != NULL) 234 cp = quote(SAVE(ecp)); 235 else 236 cp = NULL; 237 238 if (cp == NULL) 239 fast = 1; /* No home -> can't read scripts */ 240 else 241 set(STRhome, cp); 242 dinit(cp); /* dinit thinks that HOME == cwd in a login 243 * shell */ 244 /* 245 * Grab other useful things from the environment. Should we grab 246 * everything?? 247 */ 248 if ((ecp = getenv("LOGNAME")) != NULL || 249 (ecp = getenv("USER")) != NULL) 250 set(STRuser, quote(SAVE(ecp))); 251 if ((ecp = getenv("TERM")) != NULL) 252 set(STRterm, quote(SAVE(ecp))); 253 254 /* 255 * Re-initialize path if set in environment 256 */ 257 if ((ecp = getenv("PATH")) == NULL) { 258 #ifdef _PATH_DEFPATH 259 importpath(str2short(_PATH_DEFPATH)); 260 #else 261 setq(STRpath, defaultpath(), &shvhed); 262 #endif 263 } else { 264 importpath(str2short(ecp)); 265 } 266 267 set(STRshell, Strsave(STR_SHELLPATH)); 268 269 doldol = putn((int) getpid()); /* For $$ */ 270 shtemp = Strspl(STRtmpsh, doldol); /* For << */ 271 272 /* 273 * Record the interrupt states from the parent process. If the parent is 274 * non-interruptible our hand must be forced or we (and our children) won't 275 * be either. Our children inherit termination from our parent. We catch it 276 * only if we are the login shell. 277 */ 278 /* parents interruptibility */ 279 (void)sigaction(SIGINT, NULL, &oact); 280 parintr = oact.sa_handler; 281 (void)sigaction(SIGTERM, NULL, &oact); 282 parterm = oact.sa_handler; 283 284 /* catch these all, login shell or not */ 285 (void)signal(SIGHUP, phup); /* exit processing on HUP */ 286 (void)signal(SIGXCPU, phup); /* ...and on XCPU */ 287 (void)signal(SIGXFSZ, phup); /* ...and on XFSZ */ 288 289 /* 290 * Process the arguments. 291 * 292 * Note that processing of -v/-x is actually delayed till after script 293 * processing. 294 * 295 * We set the first character of our name to be '-' if we are a shell 296 * running interruptible commands. Many programs which examine ps'es 297 * use this to filter such shells out. 298 */ 299 argc--, tempv++; 300 while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) { 301 do 302 switch (*tcp++) { 303 case 0: /* - Interruptible, no prompt */ 304 prompt = 0; 305 setintr = 1; 306 nofile = 1; 307 break; 308 case 'b': /* -b Next arg is input file */ 309 batch = 1; 310 break; 311 case 'c': /* -c Command input from arg */ 312 if (argc == 1) 313 xexit(0); 314 argc--, tempv++; 315 arginp = SAVE(tempv[0]); 316 prompt = 0; 317 nofile = 1; 318 break; 319 case 'e': /* -e Exit on any error */ 320 exiterr = 1; 321 break; 322 case 'f': /* -f Fast start */ 323 fast = 1; 324 break; 325 case 'i': /* -i Interactive, even if !intty */ 326 intact = 1; 327 nofile = 1; 328 break; 329 case 'm': /* -m read .cshrc (from su) */ 330 mflag = 1; 331 break; 332 case 'n': /* -n Don't execute */ 333 noexec = 1; 334 break; 335 case 'q': /* -q (Undoc'd) ... die on quit */ 336 quitit = 1; 337 break; 338 case 's': /* -s Read from std input */ 339 nofile = 1; 340 break; 341 case 't': /* -t Read one line from input */ 342 onelflg = 2; 343 prompt = 0; 344 nofile = 1; 345 break; 346 case 'v': /* -v Echo hist expanded input */ 347 nverbose = 1; /* ... later */ 348 break; 349 case 'x': /* -x Echo just before execution */ 350 nexececho = 1; /* ... later */ 351 break; 352 case 'V': /* -V Echo hist expanded input */ 353 setNS(STRverbose); /* NOW! */ 354 break; 355 case 'X': /* -X Echo just before execution */ 356 setNS(STRecho); /* NOW! */ 357 break; 358 359 } while (*tcp); 360 tempv++, argc--; 361 } 362 363 if (quitit) /* With all due haste, for debugging */ 364 (void)signal(SIGQUIT, SIG_DFL); 365 366 /* 367 * Unless prevented by -, -c, -i, -s, or -t, if there are remaining 368 * arguments the first of them is the name of a shell file from which to 369 * read commands. 370 */ 371 if (nofile == 0 && argc > 0) { 372 nofile = open(tempv[0], O_RDONLY); 373 if (nofile < 0) { 374 child = 1; /* So this doesn't return */ 375 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 376 } 377 ffile = SAVE(tempv[0]); 378 /* 379 * Replace FSHIN. Handle /dev/std{in,out,err} specially 380 * since once they are closed we cannot open them again. 381 * In that case we use our own saved descriptors 382 */ 383 if ((SHIN = dmove(nofile, FSHIN)) < 0) 384 switch(nofile) { 385 case 0: 386 SHIN = FSHIN; 387 break; 388 case 1: 389 SHIN = FSHOUT; 390 break; 391 case 2: 392 SHIN = FSHERR; 393 break; 394 default: 395 stderror(ERR_SYSTEM, tempv[0], strerror(errno)); 396 /* NOTREACHED */ 397 } 398 (void)ioctl(SHIN, FIOCLEX, NULL); 399 prompt = 0; 400 /* argc not used any more */ tempv++; 401 } 402 403 intty = isatty(SHIN); 404 intty |= intact; 405 if (intty || (intact && isatty(SHOUT))) { 406 if (!batch && (uid != euid || gid != egid)) { 407 errno = EACCES; 408 child = 1; /* So this doesn't return */ 409 stderror(ERR_SYSTEM, "csh", strerror(errno)); 410 } 411 } 412 /* 413 * Decide whether we should play with signals or not. If we are explicitly 414 * told (via -i, or -) or we are a login shell (arg0 starts with -) or the 415 * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx") 416 * Note that in only the login shell is it likely that parent may have set 417 * signals to be ignored 418 */ 419 if (loginsh || intact || (intty && isatty(SHOUT))) 420 setintr = 1; 421 settell(); 422 /* 423 * Save the remaining arguments in argv. 424 */ 425 setq(STRargv, blk2short(tempv), &shvhed); 426 427 /* 428 * Set up the prompt. 429 */ 430 if (prompt) { 431 set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent)); 432 /* that's a meta-questionmark */ 433 set(STRprompt2, Strsave(STRmquestion)); 434 } 435 436 /* 437 * If we are an interactive shell, then start fiddling with the signals; 438 * this is a tricky game. 439 */ 440 shpgrp = getpgrp(); 441 opgrp = tpgrp = -1; 442 if (setintr) { 443 **argv = '-'; 444 if (!quitit) /* Wary! */ 445 (void)signal(SIGQUIT, SIG_IGN); 446 (void)signal(SIGINT, pintr); 447 sigemptyset(&nsigset); 448 (void)sigaddset(&nsigset, SIGINT); 449 (void)sigprocmask(SIG_BLOCK, &nsigset, NULL); 450 (void)signal(SIGTERM, SIG_IGN); 451 if (quitit == 0 && arginp == 0) { 452 (void)signal(SIGTSTP, SIG_IGN); 453 (void)signal(SIGTTIN, SIG_IGN); 454 (void)signal(SIGTTOU, SIG_IGN); 455 /* 456 * Wait till in foreground, in case someone stupidly runs csh & 457 * dont want to try to grab away the tty. 458 */ 459 if (isatty(FSHERR)) 460 f = FSHERR; 461 else if (isatty(FSHOUT)) 462 f = FSHOUT; 463 else if (isatty(OLDSTD)) 464 f = OLDSTD; 465 else 466 f = -1; 467 retry: 468 if ((tpgrp = tcgetpgrp(f)) != -1) { 469 if (tpgrp != shpgrp) { 470 sig_t old = signal(SIGTTIN, SIG_DFL); 471 (void)kill(0, SIGTTIN); 472 (void)signal(SIGTTIN, old); 473 goto retry; 474 } 475 opgrp = shpgrp; 476 shpgrp = getpid(); 477 tpgrp = shpgrp; 478 /* 479 * Setpgid will fail if we are a session leader and 480 * mypid == mypgrp (POSIX 4.3.3) 481 */ 482 if (opgrp != shpgrp) 483 if (setpgid(0, shpgrp) == -1) 484 goto notty; 485 /* 486 * We do that after we set our process group, to make sure 487 * that the process group belongs to a process in the same 488 * session as the tty (our process and our group) (POSIX 7.2.4) 489 */ 490 if (tcsetpgrp(f, shpgrp) == -1) 491 goto notty; 492 (void)ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL); 493 } 494 if (tpgrp == -1) { 495 notty: 496 #ifndef __minix /* MINIX3 has no job control. No need to report this. */ 497 (void)fprintf(csherr, "Warning: no access to tty (%s).\n", 498 strerror(errno)); 499 (void)fprintf(csherr, "Thus no job control in this shell.\n"); 500 #else /* __minix */ 501 /* nothing */; 502 #endif /* __minix */ 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 sig_t oparintr; 520 sigset_t osigset; 521 int osetintr; 522 523 oparintr = parintr; 524 osetintr = setintr; 525 sigemptyset(&nsigset); 526 (void)sigaddset(&nsigset, SIGINT); 527 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 528 529 setintr = 0; 530 parintr = SIG_IGN; /* Disable onintr */ 531 #ifdef _PATH_DOTCSHRC 532 (void)srcfile(_PATH_DOTCSHRC, 0, 0); 533 #endif 534 if (!fast && !arginp && !onelflg) 535 dohash(NULL, NULL); 536 #ifdef _PATH_DOTLOGIN 537 if (loginsh) 538 (void)srcfile(_PATH_DOTLOGIN, 0, 0); 539 #endif 540 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 541 setintr = osetintr; 542 parintr = oparintr; 543 } 544 (void)srccat(value(STRhome), STRsldotcshrc); 545 546 if (!fast && !arginp && !onelflg && !havhash) 547 dohash(NULL, NULL); 548 /* 549 * Source history before .login so that it is available in .login 550 */ 551 if ((cp = value(STRhistfile)) != STRNULL) 552 tildehist[2] = cp; 553 dosource(tildehist, NULL); 554 if (loginsh) 555 (void)srccat(value(STRhome), STRsldotlogin); 556 } 557 558 /* 559 * Now are ready for the -v and -x flags 560 */ 561 if (nverbose) 562 setNS(STRverbose); 563 if (nexececho) 564 setNS(STRecho); 565 566 /* 567 * All the rest of the world is inside this call. The argument to process 568 * indicates whether it should catch "error unwinds". Thus if we are a 569 * interactive shell our call here will never return by being blown past on 570 * an error. 571 */ 572 process(setintr); 573 574 /* 575 * Mop-up. 576 */ 577 if (intty) { 578 if (loginsh) { 579 (void)fprintf(cshout, "logout\n"); 580 (void)close(SHIN); 581 child = 1; 582 goodbye(); 583 } 584 else { 585 (void)fprintf(cshout, "exit\n"); 586 } 587 } 588 rechist(); 589 exitstat(); 590 /* NOTREACHED */ 591 } 592 593 void 594 untty(void) 595 { 596 if (tpgrp > 0) { 597 (void)setpgid(0, opgrp); 598 (void)tcsetpgrp(FSHTTY, opgrp); 599 } 600 } 601 602 void 603 importpath(Char *cp) 604 { 605 Char *dp, **pv; 606 int c, i; 607 608 i = 0; 609 for (dp = cp; *dp; dp++) 610 if (*dp == ':') 611 i++; 612 /* 613 * i+2 where i is the number of colons in the path. There are i+1 614 * directories in the path plus we need room for a zero terminator. 615 */ 616 pv = (Char **)xcalloc((size_t) (i + 2), sizeof(Char **)); 617 dp = cp; 618 i = 0; 619 if (*dp) 620 for (;;) { 621 if ((c = *dp) == ':' || c == 0) { 622 *dp = 0; 623 pv[i++] = Strsave(*cp ? cp : STRdot); 624 if (c) { 625 cp = dp + 1; 626 *dp = ':'; 627 } 628 else 629 break; 630 } 631 dp++; 632 } 633 pv[i] = 0; 634 setq(STRpath, pv, &shvhed); 635 } 636 637 /* 638 * Source to the file which is the catenation of the argument names. 639 */ 640 static int 641 srccat(Char *cp, Char *dp) 642 { 643 Char *ep; 644 char *ptr; 645 646 ep = Strspl(cp, dp); 647 ptr = short2str(ep); 648 xfree((ptr_t) ep); 649 return srcfile(ptr, mflag ? 0 : 1, 0); 650 } 651 652 /* 653 * Source to a file putting the file descriptor in a safe place (> 2). 654 */ 655 static int 656 srcfile(const char *f, int onlyown, int flag) 657 { 658 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; 674 675 static void 676 srcunit(int unit, int onlyown, int hflg) 677 { 678 /* We have to push down a lot of state here */ 679 /* All this could go into a structure */ 680 struct whyle *oldwhyl; 681 struct Bin saveB; 682 sigset_t nsigset, osigset; 683 jmp_buf oldexit; 684 Char *oarginp, *oevalp, **oevalvec, *ogointr; 685 Char OHIST; 686 int oSHIN, oinsource, oldintty, oonelflg; 687 int oenterhist, otell; 688 /* The (few) real local variables */ 689 int my_reenter; 690 691 oSHIN = -1; 692 oldintty = intty; 693 oinsource = insource; 694 oldwhyl = whyles; 695 ogointr = gointr; 696 oarginp = arginp; 697 oevalp = evalp; 698 oevalvec = evalvec; 699 oonelflg = onelflg; 700 oenterhist = enterhist; 701 OHIST = HIST; 702 otell = cantell; 703 704 if (unit < 0) 705 return; 706 if (didfds) 707 donefds(); 708 if (onlyown) { 709 struct stat stb; 710 711 if (fstat(unit, &stb) < 0) { 712 (void)close(unit); 713 return; 714 } 715 } 716 717 /* 718 * There is a critical section here while we are pushing down the input 719 * stream since we have stuff in different structures. If we weren't 720 * careful an interrupt could corrupt SHIN's Bin structure and kill the 721 * shell. 722 * 723 * We could avoid the critical region by grouping all the stuff in a single 724 * structure and pointing at it to move it all at once. This is less 725 * efficient globally on many variable references however. 726 */ 727 insource = 1; 728 getexit(oldexit); 729 730 if (setintr) { 731 sigemptyset(&nsigset); 732 (void)sigaddset(&nsigset, SIGINT); 733 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 734 } 735 /* Setup the new values of the state stuff saved above */ 736 (void)memcpy(&saveB, &B, sizeof(B)); 737 fbuf = NULL; 738 fseekp = feobp = fblocks = 0; 739 oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0; 740 intty = isatty(SHIN), whyles = 0, gointr = 0; 741 evalvec = 0; 742 evalp = 0; 743 enterhist = hflg; 744 if (enterhist) 745 HIST = '\0'; 746 747 /* 748 * Now if we are allowing commands to be interrupted, we let ourselves be 749 * interrupted. 750 */ 751 if (setintr) 752 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 753 settell(); 754 755 if ((my_reenter = setexit()) == 0) 756 process(0); /* 0 -> blow away on errors */ 757 758 if (setintr) 759 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 760 if (oSHIN >= 0) { 761 int i; 762 763 /* We made it to the new state... free up its storage */ 764 /* This code could get run twice but xfree doesn't care */ 765 for (i = 0; i < fblocks; i++) 766 xfree((ptr_t) fbuf[i]); 767 xfree((ptr_t) fbuf); 768 769 /* Reset input arena */ 770 (void)memcpy(&B, &saveB, sizeof(B)); 771 772 (void)close(SHIN), SHIN = oSHIN; 773 arginp = oarginp, onelflg = oonelflg; 774 evalp = oevalp, evalvec = oevalvec; 775 intty = oldintty, whyles = oldwhyl, gointr = ogointr; 776 if (enterhist) 777 HIST = OHIST; 778 enterhist = oenterhist; 779 cantell = otell; 780 } 781 782 resexit(oldexit); 783 /* 784 * If process reset() (effectively an unwind) then we must also unwind. 785 */ 786 if (my_reenter) 787 stderror(ERR_SILENT); 788 insource = oinsource; 789 } 790 791 void 792 rechist(void) 793 { 794 Char buf[BUFSIZE], hbuf[BUFSIZE], *hfile; 795 int fp, ftmp, oldidfds; 796 struct varent *shist; 797 798 if (!fast) { 799 /* 800 * If $savehist is just set, we use the value of $history 801 * else we use the value in $savehist 802 */ 803 if ((shist = adrof(STRsavehist)) != NULL) { 804 if (shist->vec[0][0] != '\0') 805 (void)Strcpy(hbuf, shist->vec[0]); 806 else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0') 807 (void)Strcpy(hbuf, shist->vec[0]); 808 else 809 return; 810 } 811 else 812 return; 813 814 if ((hfile = value(STRhistfile)) == STRNULL) { 815 hfile = Strcpy(buf, value(STRhome)); 816 (void) Strcat(buf, STRsldthist); 817 } 818 819 if ((fp = open(short2str(hfile), O_WRONLY | O_CREAT | O_TRUNC, 820 0600)) == -1) 821 return; 822 823 oldidfds = didfds; 824 didfds = 0; 825 ftmp = SHOUT; 826 SHOUT = fp; 827 dumphist[2] = hbuf; 828 dohist(dumphist, NULL); 829 SHOUT = ftmp; 830 (void)close(fp); 831 didfds = oldidfds; 832 } 833 } 834 835 void 836 goodbye(void) 837 { 838 rechist(); 839 840 if (loginsh) { 841 (void)signal(SIGQUIT, SIG_IGN); 842 (void)signal(SIGINT, SIG_IGN); 843 (void)signal(SIGTERM, SIG_IGN); 844 setintr = 0; /* No interrupts after "logout" */ 845 if (!(adrof(STRlogout))) 846 set(STRlogout, STRnormal); 847 #ifdef _PATH_DOTLOGOUT 848 (void)srcfile(_PATH_DOTLOGOUT, 0, 0); 849 #endif 850 if (adrof(STRhome)) 851 (void)srccat(value(STRhome), STRsldtlogout); 852 } 853 exitstat(); 854 /* NOTREACHED */ 855 } 856 857 __dead void 858 exitstat(void) 859 { 860 Char *s; 861 #ifdef PROF 862 monitor(0); 863 #endif 864 /* 865 * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit 866 * directly because we poke child here. Otherwise we might continue 867 * unwarrantedly (sic). 868 */ 869 child = 1; 870 s = value(STRstatus); 871 xexit(s ? getn(s) : 0); 872 /* NOTREACHED */ 873 } 874 875 /* 876 * in the event of a HUP we want to save the history 877 */ 878 static void 879 phup(int sig) 880 { 881 rechist(); 882 883 /* 884 * We kill the last foreground process group. It then becomes 885 * responsible to propagate the SIGHUP to its progeny. 886 */ 887 { 888 struct process *pp, *np; 889 890 for (pp = proclist.p_next; pp; pp = pp->p_next) { 891 np = pp; 892 /* 893 * Find if this job is in the foreground. It could be that 894 * the process leader has exited and the foreground flag 895 * is cleared for it. 896 */ 897 do 898 /* 899 * If a process is in the foreground; we try to kill 900 * its process group. If we succeed, then the 901 * whole job is gone. Otherwise we keep going... 902 * But avoid sending HUP to the shell again. 903 */ 904 if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp && 905 kill(-np->p_jobid, SIGHUP) != -1) { 906 /* In case the job was suspended... */ 907 (void)kill(-np->p_jobid, SIGCONT); 908 break; 909 } 910 while ((np = np->p_friends) != pp); 911 } 912 } 913 xexit(sig); 914 /* NOTREACHED */ 915 } 916 917 Char *jobargv[2] = {STRjobs, 0}; 918 919 /* 920 * Catch an interrupt, e.g. during lexical input. 921 * If we are an interactive shell, we reset the interrupt catch 922 * immediately. In any case we drain the shell output, 923 * and finally go through the normal error mechanism, which 924 * gets a chance to make the shell go away. 925 */ 926 /* ARGSUSED */ 927 void 928 pintr(int notused) 929 { 930 pintr1(1); 931 /* NOTREACHED */ 932 } 933 934 void 935 pintr1(int wantnl) 936 { 937 Char **v; 938 sigset_t nsigset, osigset; 939 940 sigemptyset(&nsigset); 941 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 942 if (setintr) { 943 nsigset = osigset; 944 (void)sigdelset(&nsigset, SIGINT); 945 (void)sigprocmask(SIG_SETMASK, &nsigset, NULL); 946 if (pjobs) { 947 pjobs = 0; 948 (void)fprintf(cshout, "\n"); 949 dojobs(jobargv, NULL); 950 stderror(ERR_NAME | ERR_INTR); 951 } 952 } 953 (void)sigdelset(&osigset, SIGCHLD); 954 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 955 (void)fpurge(cshout); 956 (void)endpwent(); 957 958 /* 959 * If we have an active "onintr" then we search for the label. Note that if 960 * one does "onintr -" then we shan't be interruptible so we needn't worry 961 * about that here. 962 */ 963 if (gointr) { 964 gotolab(gointr); 965 timflg = 0; 966 if ((v = pargv) != NULL) 967 pargv = 0, blkfree(v); 968 if ((v = gargv) != NULL) 969 gargv = 0, blkfree(v); 970 reset(); 971 } 972 else if (intty && wantnl) { 973 (void)fputc('\r', cshout); 974 (void)fputc('\n', cshout); 975 } 976 stderror(ERR_SILENT); 977 /* NOTREACHED */ 978 } 979 980 /* 981 * Process is the main driving routine for the shell. 982 * It runs all command processing, except for those within { ... } 983 * in expressions (which is run by a routine evalav in sh.exp.c which 984 * is a stripped down process), and `...` evaluation which is run 985 * also by a subset of this code in sh.glob.c in the routine backeval. 986 * 987 * The code here is a little strange because part of it is interruptible 988 * and hence freeing of structures appears to occur when none is necessary 989 * if this is ignored. 990 * 991 * Note that if catch is not set then we will unwind on any error. 992 * If an end-of-file occurs, we return. 993 */ 994 static struct command *savet = NULL; 995 996 void 997 process(int catch) 998 { 999 struct command *t; 1000 jmp_buf osetexit; 1001 sigset_t nsigset; 1002 1003 t = savet; 1004 savet = NULL; 1005 getexit(osetexit); 1006 for (;;) { 1007 pendjob(); 1008 paraml.next = paraml.prev = ¶ml; 1009 paraml.word = STRNULL; 1010 (void)setexit(); 1011 justpr = enterhist; /* execute if not entering history */ 1012 1013 /* 1014 * Interruptible during interactive reads 1015 */ 1016 if (setintr) { 1017 sigemptyset(&nsigset); 1018 (void)sigaddset(&nsigset, SIGINT); 1019 (void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL); 1020 } 1021 1022 /* 1023 * For the sake of reset() 1024 */ 1025 freelex(¶ml); 1026 if (savet) 1027 freesyn(savet), savet = NULL; 1028 1029 if (haderr) { 1030 if (!catch) { 1031 /* unwind */ 1032 doneinp = 0; 1033 resexit(osetexit); 1034 savet = t; 1035 reset(); 1036 } 1037 haderr = 0; 1038 /* 1039 * Every error is eventually caught here or the shell dies. It is 1040 * at this point that we clean up any left-over open files, by 1041 * closing all but a fixed number of pre-defined files. Thus 1042 * routines don't have to worry about leaving files open due to 1043 * deeper errors... they will get closed here. 1044 */ 1045 closem(); 1046 continue; 1047 } 1048 if (doneinp) { 1049 doneinp = 0; 1050 break; 1051 } 1052 if (chkstop) 1053 chkstop--; 1054 if (neednote) 1055 pnote(); 1056 if (intty && prompt && evalvec == 0) { 1057 mailchk(); 1058 /* 1059 * If we are at the end of the input buffer then we are going to 1060 * read fresh stuff. Otherwise, we are rereading input and don't 1061 * need or want to prompt. 1062 */ 1063 if (aret == F_SEEK && fseekp == feobp) 1064 printprompt(); 1065 (void)fflush(cshout); 1066 } 1067 if (seterr) { 1068 xfree((ptr_t) seterr); 1069 seterr = NULL; 1070 } 1071 1072 /* 1073 * Echo not only on VERBOSE, but also with history expansion. If there 1074 * is a lexical error then we forego history echo. 1075 */ 1076 if ((lex(¶ml) && !seterr && intty) || adrof(STRverbose)) { 1077 int odidfds = didfds; 1078 fflush(csherr); 1079 didfds = 0; 1080 prlex(csherr, ¶ml); 1081 fflush(csherr); 1082 didfds = odidfds; 1083 } 1084 1085 /* 1086 * The parser may lose space if interrupted. 1087 */ 1088 if (setintr) 1089 (void)sigprocmask(SIG_BLOCK, &nsigset, NULL); 1090 1091 /* 1092 * Save input text on the history list if reading in old history, or it 1093 * is from the terminal at the top level and not in a loop. 1094 * 1095 * PWP: entry of items in the history list while in a while loop is done 1096 * elsewhere... 1097 */ 1098 if (enterhist || (catch && intty && !whyles)) 1099 savehist(¶ml); 1100 1101 /* 1102 * Print lexical error messages, except when sourcing history lists. 1103 */ 1104 if (!enterhist && seterr) 1105 stderror(ERR_OLD); 1106 1107 /* 1108 * If had a history command :p modifier then this is as far as we 1109 * should go 1110 */ 1111 if (justpr) 1112 reset(); 1113 1114 alias(¶ml); 1115 1116 /* 1117 * Parse the words of the input into a parse tree. 1118 */ 1119 savet = syntax(paraml.next, ¶ml, 0); 1120 if (seterr) 1121 stderror(ERR_OLD); 1122 1123 execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL); 1124 1125 /* 1126 * Made it! 1127 */ 1128 freelex(¶ml); 1129 freesyn((struct command *) savet), savet = NULL; 1130 } 1131 resexit(osetexit); 1132 savet = t; 1133 } 1134 1135 void 1136 /*ARGSUSED*/ 1137 dosource(Char **v, struct command *t) 1138 { 1139 Char buf[BUFSIZE], *f; 1140 int hflg; 1141 1142 hflg = 0; 1143 v++; 1144 if (*v && eq(*v, STRmh)) { 1145 if (*++v == NULL) 1146 stderror(ERR_NAME | ERR_HFLAG); 1147 hflg++; 1148 } 1149 (void)Strcpy(buf, *v); 1150 f = globone(buf, G_ERROR); 1151 (void)strcpy((char *)buf, short2str(f)); 1152 xfree((ptr_t) f); 1153 if (!srcfile((char *)buf, 0, hflg) && !hflg) 1154 stderror(ERR_SYSTEM, (char *)buf, strerror(errno)); 1155 } 1156 1157 /* 1158 * Check for mail. 1159 * If we are a login shell, then we don't want to tell 1160 * about any mail file unless its been modified 1161 * after the time we started. 1162 * This prevents us from telling the user things he already 1163 * knows, since the login program insists on saying 1164 * "You have mail." 1165 */ 1166 static void 1167 mailchk(void) 1168 { 1169 struct stat stb; 1170 struct varent *v; 1171 Char **vp; 1172 time_t t; 1173 int cnt, intvl; 1174 int new; 1175 1176 v = adrof(STRmail); 1177 if (v == 0) 1178 return; 1179 (void)time(&t); 1180 vp = v->vec; 1181 cnt = blklen(vp); 1182 intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL; 1183 if (intvl < 1) 1184 intvl = 1; 1185 if (chktim + intvl > t) 1186 return; 1187 for (; *vp; vp++) { 1188 if (stat(short2str(*vp), &stb) < 0) 1189 continue; 1190 new = stb.st_mtime > time0.tv_sec; 1191 if (stb.st_size == 0 || stb.st_atime > stb.st_mtime || 1192 (stb.st_atime < chktim && stb.st_mtime < chktim) || 1193 (loginsh && !new)) 1194 continue; 1195 if (cnt == 1) 1196 (void)fprintf(cshout, "You have %smail.\n", new ? "new " : ""); 1197 else 1198 (void)fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail", 1199 vis_str(*vp)); 1200 } 1201 chktim = t; 1202 } 1203 1204 /* 1205 * Extract a home directory from the password file 1206 * The argument points to a buffer where the name of the 1207 * user whose home directory is sought is currently. 1208 * We write the home directory of the user back there. 1209 */ 1210 int 1211 gethdir(Char *home) 1212 { 1213 struct passwd *pw; 1214 Char *h; 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 descriptor 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 ssize_t 1244 readf(void *oreo, void *buf, size_t siz) 1245 { 1246 return read(DESC(oreo), buf, siz); 1247 } 1248 1249 1250 static ssize_t 1251 writef(void *oreo, const void *buf, size_t siz) 1252 { 1253 return write(DESC(oreo), buf, siz); 1254 } 1255 1256 static off_t 1257 seekf(void *oreo, off_t off, int whence) 1258 { 1259 return lseek(DESC(oreo), off, whence); 1260 } 1261 1262 1263 static int 1264 closef(void *oreo) 1265 { 1266 return close(DESC(oreo)); 1267 } 1268 1269 1270 /* 1271 * Print the visible version of a string. 1272 */ 1273 int 1274 vis_fputc(int ch, FILE *fp) 1275 { 1276 char uenc[5]; /* 4 + NULL */ 1277 1278 if (ch & QUOTE) 1279 return fputc(ch & TRIM, fp); 1280 /* 1281 * XXX: When we are in AsciiOnly we want all characters >= 0200 to 1282 * be encoded, but currently there is no way in vis to do that. 1283 */ 1284 (void)vis(uenc, ch & TRIM, VIS_NOSLASH, 0); 1285 return (fputs(uenc, fp)); 1286 } 1287 1288 /* 1289 * Move the initial descriptors to their eventual 1290 * resting places, closing all other units. 1291 */ 1292 void 1293 initdesc(void) 1294 { 1295 didfds = 0; /* 0, 1, 2 aren't set up */ 1296 (void)ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL); 1297 (void)ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL); 1298 (void)ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL); 1299 (void)ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL); 1300 closem(); 1301 } 1302 1303 1304 __dead void 1305 #ifdef PROF 1306 done(int i) 1307 #else 1308 xexit(int i) 1309 #endif 1310 { 1311 untty(); 1312 _exit(i); 1313 /* NOTREACHED */ 1314 } 1315 1316 #ifndef _PATH_DEFPATH 1317 static Char ** 1318 defaultpath(void) 1319 { 1320 struct stat stb; 1321 Char **blk, **blkp; 1322 char *ptr; 1323 1324 blkp = blk = xmalloc((size_t) sizeof(Char *) * 10); 1325 1326 #define DIRAPPEND(a) \ 1327 if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \ 1328 *blkp++ = SAVE(ptr) 1329 #ifdef RESCUEDIR 1330 DIRAPPEND(RESCUEDIR); 1331 #endif 1332 DIRAPPEND(_PATH_BIN); 1333 DIRAPPEND(_PATH_USRBIN); 1334 1335 #undef DIRAPPEND 1336 1337 #if 0 1338 if (euid != 0 && uid != 0) 1339 *blkp++ = Strsave(STRdot); 1340 #endif 1341 1342 *blkp = NULL; 1343 return (blk); 1344 } 1345 #endif /* _PATH_DEFPATH */ 1346 1347 void 1348 printprompt(void) 1349 { 1350 Char *cp; 1351 1352 if (editing) 1353 return; 1354 1355 if (!whyles) { 1356 for (cp = value(STRprompt); *cp; cp++) 1357 if (*cp == HIST) 1358 (void)fprintf(cshout, "%d", eventno + 1); 1359 else { 1360 if (*cp == '\\' && cp[1] == HIST) 1361 cp++; 1362 (void)vis_fputc(*cp | QUOTE, cshout); 1363 } 1364 } 1365 else 1366 /* 1367 * Prompt for forward reading loop body content. 1368 */ 1369 (void)fprintf(cshout, "? "); 1370 (void)fflush(cshout); 1371 } 1372 1373 #ifdef EDIT 1374 char * 1375 printpromptstr(EditLine *elx) { 1376 static char pbuf[1024]; 1377 static char qspace[] = "? "; 1378 Char *cp; 1379 size_t i; 1380 1381 if (whyles) 1382 return qspace; 1383 1384 i = 0; 1385 for (cp = value(STRprompt); *cp; cp++) { 1386 if (i >= sizeof(pbuf)) 1387 break; 1388 if (*cp == HIST) { 1389 int r; 1390 r = snprintf(pbuf + i, sizeof(pbuf) - i, "%d", eventno + 1); 1391 if (r > 0) 1392 i += (size_t)r; 1393 } else 1394 pbuf[i++] = (char)*cp; 1395 } 1396 if (i >= sizeof(pbuf)) 1397 i = sizeof(pbuf) - 1; 1398 pbuf[i] = '\0'; 1399 return pbuf; 1400 } 1401 #endif 1402