2 * sh.sem.c: I/O redirections and job forking. A touchy issue!
3 * Most stuff with builtins is incorrect
6 * Copyright (c) 1980, 1991 The Regents of the University of California.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #endif /*WINNT_NATIVE*/
44 # endif /* CLEX_DUPS */
46 #endif /* CLOSE_ON_EXEC */
48 #if defined(__sparc__) || defined(sparc)
49 # if !defined(MACH) && SYSVREL == 0 && !defined(Lynx) && !defined(BSD4_4) && !defined(__linux__) && !defined(__GNU__) && !defined(__GLIBC__)
51 # endif /* !MACH && SYSVREL == 0 && !Lynx && !BSD4_4 && !glibc */
52 #endif /* __sparc__ || sparc */
55 static void vffree (int);
57 static Char *splicepipe (struct command *, Char *);
58 static void doio (struct command *, int *, int *);
59 static void chkclob (const char *);
66 * For SVR4, there are problems with pipelines having the first process as
67 * the group leader. The problem occurs when the first process exits before
68 * the others have a chance to setpgid(). This is because in SVR4 you can't
69 * have a zombie as a group leader. The solution I have used is to reverse
70 * the order in which pipelines are started, making the last process the
71 * group leader. (Note I am not using 'pipeline' in the generic sense -- I
72 * mean processes connected by '|'.) I don't know yet if this causes other
75 * All the changes for this are in execute(), and are enclosed in
78 * David Dawes (dawes@physics.su.oz.au) Oct 1991
83 execute(struct command *t, volatile int wanttty, int *pipein, int *pipeout,
87 const struct biltins * volatile bifunc;
91 static sigset_t csigset;
93 static int onosigchld = 0;
95 static int nosigchld = 0;
106 if ((varval(STRNTslowexec) == STRNULL) &&
107 !t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds &&
108 (intty || intact) && (t->t_dtyp == NODE_COMMAND) &&
110 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
111 (void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
113 if (nt_try_fast_exec(t) == 0)
117 #endif /* WINNT_NATIVE */
120 * Ed hutchins@sgi.com & Dominic dbg@sgi.com
121 * Sat Feb 25 03:13:11 PST 1995
122 * try implicit cd if we have a 1 word command
124 if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] &&
125 t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) {
130 sCName = dollar(t->t_dcom[0]);
131 if (sCName != NULL && sCName[0] == '~') {
132 struct Strbuf buf = Strbuf_INIT;
133 const Char *name_end;
135 for (name_end = sCName + 1; *name_end != '\0' && *name_end != '/';
138 if (name_end != sCName + 1) {
141 name = Strnsave(sCName + 1, name_end - (sCName + 1));
142 home = gethdir(name);
144 Strbuf_append(&buf, home);
147 Strbuf_append(&buf, name);
150 Strbuf_append(&buf, varval(STRhome));
151 Strbuf_append(&buf, name_end);
153 sCName = Strbuf_finish(&buf);
156 pathname = short2str(sCName);
158 /* if this is a dir, tack a "cd" on as the first arg */
159 if (pathname != NULL &&
160 ((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode))
162 || (pathname[0] && pathname[1] == ':' && pathname[2] == '\0')
163 #endif /* WINNT_NATIVE */
166 Char **ot_dcom = t->t_dcom;
168 vCD[0] = Strsave(STRcd);
170 t->t_dcom = blkspl(vCD, ot_dcom);
172 if (implicit_cd > 1) {
180 * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
181 * Don't check for wantty > 0...
183 if (t->t_dflg & F_AMPERSAND)
188 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
189 memmove(t->t_dcom[0], t->t_dcom[0] + 1,
190 (Strlen(t->t_dcom[0] + 1) + 1) * sizeof (*t->t_dcom[0]));
191 if ((t->t_dflg & F_REPEAT) == 0)
192 Dfix(t); /* $ " ' \ */
193 if (t->t_dcom[0] == 0) {
200 if (t->t_dflg & F_PIPEIN)
202 #else /* !BACKPIPE */
203 if (t->t_dflg & F_PIPEOUT)
205 #endif /* BACKPIPE */
207 * Must do << early so parent will know where input pointer should be.
208 * If noexec then this is all we do.
210 if (t->t_dflg & F_READ) {
211 int old_pintr_disabled;
215 pintr_push_enable(&old_pintr_disabled);
218 cleanup_until(&old_pintr_disabled);
223 setcopy(STRstatus, STR0, VAR_READWRITE);
226 * This mess is the necessary kludge to handle the prefix builtins:
227 * nice, nohup, time. These commands can also be used by themselves,
228 * and this is not handled here. This will also work when loops are
231 while (t->t_dtyp == NODE_COMMAND)
232 if (eq(t->t_dcom[0], STRnice)) {
234 if (strchr("+-", t->t_dcom[1][0])) {
237 t->t_nice = (unsigned char)getn(t->t_dcom[1]);
238 lshift(t->t_dcom, 2);
246 lshift(t->t_dcom, 1);
253 else if (eq(t->t_dcom[0], STRnohup)) {
255 t->t_dflg |= F_NOHUP;
256 lshift(t->t_dcom, 1);
261 else if (eq(t->t_dcom[0], STRhup)) {
264 lshift(t->t_dcom, 1);
269 else if (eq(t->t_dcom[0], STRtime)) {
272 lshift(t->t_dcom, 1);
278 else if (eq(t->t_dcom[0], STRver))
279 if (t->t_dcom[1] && t->t_dcom[2]) {
281 t->t_systype = getv(t->t_dcom[1]);
282 lshift(t->t_dcom, 2);
291 /* is it a command */
292 if (t->t_dtyp == NODE_COMMAND) {
294 * Check if we have a builtin function and remember which one.
299 * Continue for builtins that are part of the scripting language
303 if (bifunc->bfunct != (bfunc_t)dobreak &&
304 bifunc->bfunct != (bfunc_t)docontin &&
305 bifunc->bfunct != (bfunc_t)doelse &&
306 bifunc->bfunct != (bfunc_t)doend &&
307 bifunc->bfunct != (bfunc_t)doforeach&&
308 bifunc->bfunct != (bfunc_t)dogoto &&
309 bifunc->bfunct != (bfunc_t)doif &&
310 bifunc->bfunct != (bfunc_t)dorepeat &&
311 bifunc->bfunct != (bfunc_t)doswbrk &&
312 bifunc->bfunct != (bfunc_t)doswitch &&
313 bifunc->bfunct != (bfunc_t)dowhile &&
314 bifunc->bfunct != (bfunc_t)dozip)
318 else { /* not a command */
325 * GrP Executing a command - run jobcmd hook
326 * Don't run for builtins
327 * Don't run if we're not in a tty
328 * Don't run if we're not really executing
331 * CR - Charles Ross Aug 2005
333 * The new behavior is that the jobcmd won't be executed
334 * if stdout (SHOUT) isnt attached to a tty.. IE when
335 * redirecting, or using backquotes etc..
337 if (t->t_dtyp == NODE_COMMAND && !bifunc && !noexec && intty && isoutatty) {
338 Char *cmd = unparse(t);
340 cleanup_push(cmd, xfree);
346 * We fork only if we are timed, or are not the end of a parenthesized
347 * list and not a simple builtin function. Simple meaning one that is
348 * not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
349 * fork in some of these cases.
353 * Can't have NOFORK for the tail of a pipe - because it is not the
354 * last command spawned (even if it is at the end of a parenthesised
357 if (t->t_dflg & F_PIPEIN)
358 t->t_dflg &= ~(F_NOFORK);
361 * "command | builtin" may cause major misbehaviour as noted in
362 * in the BUGS file entry
363 * Subject: Redirected input to built-in functions misbehaves badly
364 * forking when the builtin is the end of the pipe corrects the
367 if (bifunc && (t->t_dflg & F_PIPEIN))
368 t->t_dflg &= ~(F_NOFORK);
369 #endif /* BACKPIPE */
371 * Prevent forking cd, pushd, popd, chdir cause this will cause the
372 * shell not to change dir! (XXX: but only for nice?)
374 if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd ||
375 bifunc->bfunct == (bfunc_t)dopushd ||
376 bifunc->bfunct == (bfunc_t)dopopd))
377 t->t_dflg &= ~(F_NICE);
379 if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
380 (!bifunc || t->t_dflg &
381 (F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) ||
383 * We have to fork for eval too.
385 (bifunc && (t->t_dflg & F_PIPEIN) != 0 &&
386 bifunc->bfunct == (bfunc_t)doeval)) {
388 if (t->t_dtyp == NODE_PAREN ||
389 t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc)
394 * We need to block SIGCHLD here, so that if the process does
395 * not die before we can set the process group
397 if (wanttty >= 0 && !nosigchld) {
399 sigaddset(&set, SIGCHLD);
400 (void)sigprocmask(SIG_BLOCK, &set, &csigset);
405 pid = pfork(t, wanttty);
406 if (pid == 0 && nosigchld) {
407 sigprocmask(SIG_SETMASK, &csigset, NULL);
410 else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
416 int ochild, osetintr, ohaderr, odidfds;
417 int oSHIN, oSHOUT, oSHDIAG, oOLDSTD, otpgrp;
418 int oisoutatty, oisdiagatty;
419 sigset_t oset, ocsigset;
420 # ifndef CLOSE_ON_EXEC
422 # endif /* !CLOSE_ON_EXEC */
425 * Prepare for the vfork by saving everything that the child
426 * corrupts before it exec's. Note that in some signal
427 * implementations which keep the signal info in user space
428 * (e.g. Sun's) it will also be necessary to save and restore
429 * the current sigvec's for the signals the child touches
434 * Sooooo true... If this is a Sun, save the sigvec's. (Skip
435 * Gilbrech - 11/22/87)
438 struct sigaction savesv[NSIGSAVED];
441 # endif /* SAVESIGVEC */
442 if (wanttty >= 0 && !nosigchld && !noexec) {
444 sigaddset(&set, SIGCHLD);
445 (void)sigprocmask(SIG_BLOCK, &set, &csigset);
449 sigaddset(&set, SIGCHLD);
450 sigaddset(&set, SIGINT);
451 (void)sigprocmask(SIG_BLOCK, &set, &oset);
456 # ifndef CLOSE_ON_EXEC
458 # endif /* !CLOSE_ON_EXEC */
464 oisoutatty = isoutatty;
465 oisdiagatty = isdiagatty;
467 onosigchld = nosigchld;
472 savesigvec(savesv, savesm);
473 # endif /* SAVESIGVEC */
481 restoresigvec(savesv, savesm);
482 # endif /* SAVESIGVEC */
483 sigprocmask(SIG_SETMASK, &oset, NULL);
484 stderror(ERR_NOPROC);
487 if (pid) { /* parent */
489 restoresigvec(savesv, savesm);
490 # endif /* SAVESIGVEC */
496 # ifndef CLOSE_ON_EXEC
498 # endif /* !CLOSE_ON_EXEC */
503 isoutatty = oisoutatty;
504 isdiagatty = oisdiagatty;
506 nosigchld = onosigchld;
516 /* this is from pfork() */
518 sigprocmask(SIG_SETMASK, &oset, NULL);
521 /* this is from pfork() */
525 sigprocmask(SIG_SETMASK, &csigset, NULL);
530 ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
531 || (gointr && eq(gointr, STRminus));
532 pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
537 * casts made right for SunOS 4.0 by Douglas C. Schmidt
538 * <schmidt%sunshine.ics.uci.edu@ROME.ICS.UCI.EDU>
541 * ignint ifs cleaned by Johan Widen <mcvax!osiris.sics.se!jw@uunet.UU.NET>
545 (void) signal(SIGINT, SIG_IGN);
546 (void) signal(SIGQUIT, SIG_IGN);
549 (void) signal(SIGINT, vffree);
550 (void) signal(SIGQUIT, SIG_DFL);
554 (void) signal(SIGTSTP, SIG_DFL);
555 (void) signal(SIGTTIN, SIG_DFL);
556 (void) signal(SIGTTOU, SIG_DFL);
558 # endif /* BSDJOBS */
560 sigaction(SIGTERM, &parterm, NULL);
562 else if (tpgrp == -1 &&
563 (t->t_dflg & F_NOINTERRUPT)) {
564 (void) signal(SIGINT, SIG_IGN);
565 (void) signal(SIGQUIT, SIG_IGN);
568 pgetty(wanttty, pgrp);
570 if (t->t_dflg & F_NOHUP)
571 (void) signal(SIGHUP, SIG_IGN);
572 if (t->t_dflg & F_HUP)
573 (void) signal(SIGHUP, SIG_DFL);
574 if (t->t_dflg & F_NICE) {
575 int nval = SIGN_EXTEND_CHAR(t->t_nice);
576 # if defined(HAVE_SETPRIORITY) && defined(PRIO_PROCESS)
577 if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
578 stderror(ERR_SYSTEM, "setpriority",
580 # else /* !HAVE_SETPRIORITY || !PRIO_PROCESS */
582 # endif /* HAVE_SETPRIORITY && PRIO_PROCESS */
585 if (t->t_dflg & F_VER) {
586 tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
597 * It would be better if we could wait for the whole job when we
598 * knew the last process had been started. Pwait, in fact, does
599 * wait for the whole job anyway, but this test doesn't really
600 * express our intentions.
603 if (didfds == 0 && t->t_dflg & F_PIPEOUT) {
607 if ((t->t_dflg & F_PIPEIN) != 0)
609 #else /* !BACKPIPE */
610 if (didfds == 0 && t->t_dflg & F_PIPEIN) {
614 if ((t->t_dflg & F_PIPEOUT) != 0)
616 #endif /* BACKPIPE */
619 sigprocmask(SIG_SETMASK, &csigset, NULL);
622 if ((t->t_dflg & F_AMPERSAND) == 0)
627 doio(t, pipein, pipeout);
629 if (t->t_dflg & F_PIPEIN) {
633 #else /* !BACKPIPE */
634 if (t->t_dflg & F_PIPEOUT) {
638 #endif /* BACKPIPE */
640 * Perform a builtin function. If we are not forked, arrange for
649 int ohaderr = haderr;
657 if (adrof(STRprintexitvalue)) {
658 int rv = getn(varval(STRstatus));
660 xprintf(CGETS(17, 2, "Exit %d\n"), rv);
665 if (t->t_dtyp != NODE_PAREN) {
670 * For () commands must put new 0,1,2 in FSH* and recurse
672 if ((OLDSTD = dcopy(0, FOLDSTD)) >= 0)
673 (void)close_on_exec(OLDSTD, 1);
674 if ((SHOUT = dcopy(1, FSHOUT)) >= 0) {
675 (void)close_on_exec(SHOUT, 1);
676 isoutatty = isatty(SHOUT);
678 if ((SHDIAG = dcopy(2, FSHDIAG)) >= 0) {
679 (void)close_on_exec(SHDIAG, 1);
680 isdiagatty = isatty(SHDIAG);
684 #ifndef CLOSE_ON_EXEC
687 (void) close_on_exec(FSHOUT, 1);
688 (void) close_on_exec(FSHDIAG, 1);
689 (void) close_on_exec(FOLDSTD, 1);
690 #endif /* !CLOSE_ON_EXEC */
693 t->t_dspr->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
694 execute(t->t_dspr, wanttty, NULL, NULL, do_glob);
699 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
700 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
701 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
702 t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
703 (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
704 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
705 #else /* !BACKPIPE */
706 t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
707 (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
708 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
709 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
710 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
711 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
712 #endif /* BACKPIPE */
717 t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
718 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
720 * In strange case of A&B make a new job after A
722 if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr &&
723 (t->t_dcdr->t_dflg & F_AMPERSAND) == 0)
727 t->t_dcdr->t_dflg |= t->t_dflg &
728 (F_NOFORK | F_NOINTERRUPT | F_BACKQ);
729 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
736 t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
737 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
738 if ((getn(varval(STRstatus)) == 0) !=
739 (t->t_dtyp == NODE_AND)) {
744 t->t_dcdr->t_dflg |= t->t_dflg &
745 (F_NOFORK | F_NOINTERRUPT | F_BACKQ);
746 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
754 * Fall through for all breaks from switch
756 * If there will be no more executions of this command, flush all file
757 * descriptors. Places that turn on the F_REPEAT bit are responsible for
758 * doing donefds after the last re-execution
760 if (didfds && !(t->t_dflg & F_REPEAT))
776 * Expand and glob the words after an i/o redirection.
777 * If more than one word is generated, then update the command vector.
779 * This is done differently in all the shells:
780 * 1. in the bourne shell and ksh globbing is not performed
781 * 2. Bash/csh say ambiguous
782 * 3. zsh does i/o to/from all the files
783 * 4. itcsh concatenates the words.
785 * I don't know what is best to do. I think that Ambiguous is better
786 * than restructuring the command vector, because the user can get
787 * unexpected results. In any case, the command vector restructuring
788 * code is present and the user can choose it by setting noambiguous
791 splicepipe(struct command *t, Char *cp)
795 if (adrof(STRnoambiguous)) {
799 blk[0] = Dfix1(cp); /* expand $ */
804 pv = globall(blk, gflag);
806 setname(short2str(blk[0]));
808 stderror(ERR_NAME | ERR_NOMATCH);
810 if (pv[1] != NULL) { /* we need to fix the command vector */
811 Char **av = blkspl(t->t_dcom, &pv[1]);
824 cleanup_push(buf, xfree);
825 blk[0] = globone(buf, G_ERROR);
832 * Perform io redirection.
833 * We may or maynot be forked here.
836 doio(struct command *t, int *pipein, int *pipeout)
840 unsigned long flags = t->t_dflg;
842 if (didfds || (flags & F_REPEAT))
844 if ((flags & F_READ) == 0) {/* F_READ already done */
849 * so < /dev/std{in,out,err} work
851 (void) dcopy(SHIN, 0);
852 (void) dcopy(SHOUT, 1);
853 (void) dcopy(SHDIAG, 2);
854 cp = splicepipe(t, t->t_dlef);
855 tmp = strsave(short2str(cp));
857 cleanup_push(tmp, xfree);
858 if ((fd = xopen(tmp, O_RDONLY|O_LARGEFILE)) < 0)
859 stderror(ERR_SYSTEM, tmp, strerror(errno));
861 /* allow input files larger than 2Gb */
863 (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
864 #endif /*!WINNT_NATIVE*/
867 else if (flags & F_PIPEIN) {
869 TCSH_IGNORE(dup(pipein[0]));
873 else if ((flags & F_NOINTERRUPT) && tpgrp == -1) {
875 (void) xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
879 TCSH_IGNORE(dup(OLDSTD));
880 #if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
882 * PWP: Unlike Bezerkeley 4.3, FIONCLEX for Pyramid is preserved
883 * across dup()s, so we have to UNSET it here or else we get a
884 * command with NO stdin, stdout, or stderr at all (a bad thing
887 (void) close_on_exec(0, 0);
888 #endif /* CLOSE_ON_EXEC && CLEX_DUPS */
894 cp = splicepipe(t, t->t_drit);
895 tmp = strsave(short2str(cp));
897 cleanup_push(tmp, xfree);
899 * so > /dev/std{out,err} work
901 (void) dcopy(SHOUT, 1);
902 (void) dcopy(SHDIAG, 2);
903 if ((flags & F_APPEND) != 0) {
905 fd = xopen(tmp, O_WRONLY|O_APPEND|O_LARGEFILE);
906 #else /* !O_APPEND */
907 fd = xopen(tmp, O_WRONLY|O_LARGEFILE);
908 (void) lseek(fd, (off_t) 0, L_XTND);
909 #endif /* O_APPEND */
913 if ((flags & F_APPEND) == 0 || fd == -1) {
914 if (!(flags & F_OVERWRITE) && no_clobber) {
915 if (flags & F_APPEND)
916 stderror(ERR_SYSTEM, tmp, strerror(errno));
919 if ((fd = xcreat(tmp, 0666)) < 0)
920 stderror(ERR_SYSTEM, tmp, strerror(errno));
921 /* allow input files larger than 2Gb */
923 (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
924 #endif /*!WINNT_NATIVE*/
930 else if (flags & F_PIPEOUT) {
932 TCSH_IGNORE(dup(pipeout[1]));
937 TCSH_IGNORE(dup(SHOUT));
939 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
940 (void) close_on_exec(1, 0);
941 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
945 if (flags & F_STDERR) {
950 TCSH_IGNORE(dup(SHDIAG));
951 is2atty = isdiagatty;
952 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
953 (void) close_on_exec(2, 0);
954 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
965 (void)close_on_exec(pv[0] = dmove(pv[0], -1), 1);
966 (void)close_on_exec(pv[1] = dmove(pv[1], -1), 1);
967 if (pv[0] >= 0 && pv[1] >= 0)
978 chkclob(const char *cp)
982 if (stat(cp, &stb) < 0)
984 if (S_ISCHR(stb.st_mode))
986 if (no_clobber & NOCLOBBER_NOTEMPTY && stb.st_size == 0)
988 if (no_clobber & NOCLOBBER_ASK) {
989 if (getYN(CGETS(22, 15,
990 "Do you really want to overwrite an existing file? [N/y] ")))
994 stderror(ERR_EXISTS, cp);