1 /* $Header: /src/pub/tcsh/sh.sem.c,v 3.56 2002/03/08 17:36:46 christos Exp $ */
3 * sh.sem.c: I/O redirections and job forking. A touchy issue!
4 * Most stuff with builtins is incorrect
7 * Copyright (c) 1980, 1991 The Regents of the University of California.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 RCSID("$Id: sh.sem.c,v 3.56 2002/03/08 17:36:46 christos Exp $")
42 #endif /*WINNT_NATIVE*/
48 # endif /* CLEX_DUPS */
50 #endif /* CLOSE_ON_EXEC */
52 #if defined(__sparc__) || defined(sparc)
53 # if !defined(MACH) && SYSVREL == 0 && !defined(Lynx) && !defined(BSD4_4) && !defined(linux)
55 # endif /* !MACH && SYSVREL == 0 && !Lynx && !BSD4_4 && !linux */
56 #endif /* __sparc__ || sparc */
59 static sigret_t vffree __P((int));
61 static Char *splicepipe __P((struct command *, Char *));
62 static void doio __P((struct command *, int *, int *));
63 static void chkclob __P((char *));
70 * For SVR4, there are problems with pipelines having the first process as
71 * the group leader. The problem occurs when the first process exits before
72 * the others have a chance to setpgid(). This is because in SVR4 you can't
73 * have a zombie as a group leader. The solution I have used is to reverse
74 * the order in which pipelines are started, making the last process the
75 * group leader. (Note I am not using 'pipeline' in the generic sense -- I
76 * mean processes connected by '|'.) I don't know yet if this causes other
79 * All the changes for this are in execute(), and are enclosed in
82 * David Dawes (dawes@physics.su.oz.au) Oct 1991
87 execute(t, wanttty, pipein, pipeout, do_glob)
88 register struct command *t;
90 int *pipein, *pipeout;
94 extern bool use_fork; /* use fork() instead of vfork()? */
98 struct biltins *bifunc;
102 static sigmask_t csigmask;
105 static int onosigchld = 0;
107 static int nosigchld = 0;
118 if ((varval(STRNTslowexec) == STRNULL) &&
119 !t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds &&
120 (intty || intact) && (t->t_dtyp == NODE_COMMAND) &&
122 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
123 (void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
125 if (nt_try_fast_exec(t) == 0)
129 #endif /* WINNT_NATIVE */
132 * Ed hutchins@sgi.com & Dominic dbg@sgi.com
133 * Sat Feb 25 03:13:11 PST 1995
134 * try implicit cd if we have a 1 word command
136 if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] &&
137 t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) {
138 Char sCName[MAXPATHLEN];
143 dollar(sCName, t->t_dcom[0]);
146 Char sCPath[MAXPATHLEN];
150 while (*pCN && *pCN != '/')
156 (void) Strcpy(sCPath, varval(STRhome));
157 catn(sCPath, pCN, MAXPATHLEN);
158 (void) Strcpy(sCName, sCPath);
161 pathname = short2str(sCName);
162 /* if this is a dir, tack a "cd" on as the first arg */
163 if ((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode))
165 || (pathname[0] && pathname[1] == ':' && pathname[2] == '\0')
166 #endif /* WINNT_NATIVE */
169 Char **ot_dcom = t->t_dcom;
171 vCD[0] = Strsave(STRcd);
173 t->t_dcom = blkspl(vCD, ot_dcom);
174 if (implicit_cd > 1) {
178 xfree((ptr_t) ot_dcom);
183 * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
184 * Don't check for wantty > 0...
186 if (t->t_dflg & F_AMPERSAND)
191 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
192 (void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
193 if ((t->t_dflg & F_REPEAT) == 0)
194 Dfix(t); /* $ " ' \ */
195 if (t->t_dcom[0] == 0) {
202 if (t->t_dflg & F_PIPEIN)
204 #else /* !BACKPIPE */
205 if (t->t_dflg & F_PIPEOUT)
207 #endif /* BACKPIPE */
209 * Must do << early so parent will know where input pointer should be.
210 * If noexec then this is all we do.
212 if (t->t_dflg & F_READ) {
219 set(STRstatus, Strsave(STR0), VAR_READWRITE);
222 * This mess is the necessary kludge to handle the prefix builtins:
223 * nice, nohup, time. These commands can also be used by themselves,
224 * and this is not handled here. This will also work when loops are
227 while (t->t_dtyp == NODE_COMMAND)
228 if (eq(t->t_dcom[0], STRnice)) {
230 if (strchr("+-", t->t_dcom[1][0])) {
235 lshift(t->t_dcom, 2);
243 lshift(t->t_dcom, 1);
250 else if (eq(t->t_dcom[0], STRnohup)) {
252 t->t_dflg |= F_NOHUP;
253 lshift(t->t_dcom, 1);
258 else if (eq(t->t_dcom[0], STRhup)) {
261 lshift(t->t_dcom, 1);
266 else if (eq(t->t_dcom[0], STRtime)) {
269 lshift(t->t_dcom, 1);
275 else if (eq(t->t_dcom[0], STRver))
276 if (t->t_dcom[1] && t->t_dcom[2]) {
278 t->t_systype = getv(t->t_dcom[1]);
279 lshift(t->t_dcom, 2);
288 /* is it a command */
289 if (t->t_dtyp == NODE_COMMAND) {
291 * Check if we have a builtin function and remember which one.
294 if (noexec && bifunc) {
296 * Continue for builtins that are part of the scripting language
298 if (bifunc->bfunct != (bfunc_t)dobreak &&
299 bifunc->bfunct != (bfunc_t)docontin &&
300 bifunc->bfunct != (bfunc_t)doelse &&
301 bifunc->bfunct != (bfunc_t)doend &&
302 bifunc->bfunct != (bfunc_t)doforeach&&
303 bifunc->bfunct != (bfunc_t)dogoto &&
304 bifunc->bfunct != (bfunc_t)doif &&
305 bifunc->bfunct != (bfunc_t)dorepeat &&
306 bifunc->bfunct != (bfunc_t)doswbrk &&
307 bifunc->bfunct != (bfunc_t)doswitch &&
308 bifunc->bfunct != (bfunc_t)dowhile &&
309 bifunc->bfunct != (bfunc_t)dozip)
313 else { /* not a command */
320 * GrP Executing a command - run jobcmd hook
321 * Don't run for builtins
322 * Don't run if we're not in a tty
323 * Don't run if we're not really executing
325 if (t->t_dtyp == NODE_COMMAND && !bifunc && !noexec && intty) {
326 Char *cmd = unparse(t);
332 * We fork only if we are timed, or are not the end of a parenthesized
333 * list and not a simple builtin function. Simple meaning one that is
334 * not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
335 * fork in some of these cases.
338 * Prevent forking cd, pushd, popd, chdir cause this will cause the
339 * shell not to change dir!
343 * Can't have NOFORK for the tail of a pipe - because it is not the
344 * last command spawned (even if it is at the end of a parenthesised
347 if (t->t_dflg & F_PIPEIN)
348 t->t_dflg &= ~(F_NOFORK);
349 #endif /* BACKPIPE */
350 if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd ||
351 bifunc->bfunct == (bfunc_t)dopushd ||
352 bifunc->bfunct == (bfunc_t)dopopd))
353 t->t_dflg &= ~(F_NICE);
354 if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
355 (!bifunc || t->t_dflg &
356 (F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) ||
358 * We have to fork for eval too.
360 (bifunc && (t->t_dflg & F_PIPEIN) != 0 &&
361 bifunc->bfunct == (bfunc_t)doeval)) {
363 if (t->t_dtyp == NODE_PAREN ||
364 t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc)
369 * We need to block SIGCHLD here, so that if the process does
370 * not die before we can set the process group
372 if (wanttty >= 0 && !nosigchld) {
374 csigmask = sigblock(sigmask(SIGCHLD));
376 (void) sighold(SIGCHLD);
382 pid = pfork(t, wanttty);
383 if (pid == 0 && nosigchld) {
385 (void) sigsetmask(csigmask);
387 (void) sigrelse(SIGCHLD);
391 else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
397 int ochild, osetintr, ohaderr, odidfds;
398 int oSHIN, oSHOUT, oSHDIAG, oOLDSTD, otpgrp;
399 int oisoutatty, oisdiagatty;
401 # ifndef CLOSE_ON_EXEC
403 # endif /* !CLOSE_ON_EXEC */
405 sigmask_t omask, ocsigmask;
406 # endif /* BSDSIGS */
409 * Prepare for the vfork by saving everything that the child
410 * corrupts before it exec's. Note that in some signal
411 * implementations which keep the signal info in user space
412 * (e.g. Sun's) it will also be necessary to save and restore
413 * the current sigvec's for the signals the child touches
418 * Sooooo true... If this is a Sun, save the sigvec's. (Skip
419 * Gilbrech - 11/22/87)
422 sigvec_t savesv[NSIGSAVED];
425 # endif /* SAVESIGVEC */
426 if (wanttty >= 0 && !nosigchld && !noexec) {
428 csigmask = sigblock(sigmask(SIGCHLD));
429 # else /* !BSDSIGS */
430 (void) sighold(SIGCHLD);
431 # endif /* BSDSIGS */
435 omask = sigblock(sigmask(SIGCHLD)|sigmask(SIGINT));
436 # else /* !BSDSIGS */
437 (void) sighold(SIGCHLD);
438 (void) sighold(SIGINT);
439 # endif /* BSDSIGS */
444 # ifndef CLOSE_ON_EXEC
446 # endif /* !CLOSE_ON_EXEC */
452 oisoutatty = isoutatty;
453 oisdiagatty = isdiagatty;
455 ocsigmask = csigmask;
456 # endif /* BSDSIGS */
457 onosigchld = nosigchld;
462 savesm = savesigvec(savesv);
463 # endif /* SAVESIGVEC */
472 restoresigvec(savesv, savesm);
473 # endif /* SAVESIGVEC */
474 (void) sigsetmask(omask);
475 # else /* !BSDSIGS */
476 (void) sigrelse(SIGCHLD);
477 (void) sigrelse(SIGINT);
478 # endif /* BSDSIGS */
479 stderror(ERR_NOPROC);
482 if (pid) { /* parent */
484 restoresigvec(savesv, savesm);
485 # endif /* SAVESIGVEC */
491 # ifndef CLOSE_ON_EXEC
493 # endif /* !CLOSE_ON_EXEC */
498 isoutatty = oisoutatty;
499 isdiagatty = oisdiagatty;
501 csigmask = ocsigmask;
502 # endif /* BSDSIGS */
503 nosigchld = onosigchld;
509 xfree((ptr_t) Vexpath);
511 blkfree((Char **) Vt);
513 /* this is from pfork() */
516 (void) sigsetmask(omask);
517 # else /* !BSDSIGS */
518 (void) sigrelse(SIGCHLD);
519 (void) sigrelse(SIGINT);
520 # endif /* BSDSIGS */
523 /* this is from pfork() */
528 (void) sigsetmask(csigmask);
529 # else /* !BSDSIGS */
530 (void) sigrelse(SIGCHLD);
531 # endif /* BSDSIGS */
536 ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
537 || (gointr && eq(gointr, STRminus));
538 pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
543 * casts made right for SunOS 4.0 by Douglas C. Schmidt
544 * <schmidt%sunshine.ics.uci.edu@ROME.ICS.UCI.EDU>
547 * ignint ifs cleaned by Johan Widen <mcvax!osiris.sics.se!jw@uunet.UU.NET>
551 (void) signal(SIGINT, SIG_IGN);
552 (void) signal(SIGQUIT, SIG_IGN);
555 (void) signal(SIGINT, vffree);
556 (void) signal(SIGQUIT, SIG_DFL);
560 (void) signal(SIGTSTP, SIG_DFL);
561 (void) signal(SIGTTIN, SIG_DFL);
562 (void) signal(SIGTTOU, SIG_DFL);
564 # endif /* BSDJOBS */
566 (void) signal(SIGTERM, parterm);
568 else if (tpgrp == -1 &&
569 (t->t_dflg & F_NOINTERRUPT)) {
570 (void) signal(SIGINT, SIG_IGN);
571 (void) signal(SIGQUIT, SIG_IGN);
574 pgetty(wanttty, pgrp);
576 if (t->t_dflg & F_NOHUP)
577 (void) signal(SIGHUP, SIG_IGN);
578 if (t->t_dflg & F_HUP)
579 (void) signal(SIGHUP, SIG_DFL);
580 if (t->t_dflg & F_NICE) {
581 int nval = SIGN_EXTEND_CHAR(t->t_nice);
583 if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
584 stderror(ERR_SYSTEM, "setpriority",
586 # else /* !BSDNICE */
588 # endif /* BSDNICE */
591 if (t->t_dflg & F_VER) {
592 tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
603 * It would be better if we could wait for the whole job when we
604 * knew the last process had been started. Pwait, in fact, does
605 * wait for the whole job anyway, but this test doesn't really
606 * express our intentions.
609 if (didfds == 0 && t->t_dflg & F_PIPEOUT) {
610 (void) close(pipeout[0]);
611 (void) close(pipeout[1]);
613 if ((t->t_dflg & F_PIPEIN) != 0)
615 #else /* !BACKPIPE */
616 if (didfds == 0 && t->t_dflg & F_PIPEIN) {
617 (void) close(pipein[0]);
618 (void) close(pipein[1]);
620 if ((t->t_dflg & F_PIPEOUT) != 0)
622 #endif /* BACKPIPE */
626 (void) sigsetmask(csigmask);
628 (void) sigrelse(SIGCHLD);
632 if ((t->t_dflg & F_AMPERSAND) == 0)
637 doio(t, pipein, pipeout);
639 if (t->t_dflg & F_PIPEIN) {
640 (void) close(pipein[0]);
641 (void) close(pipein[1]);
643 #else /* !BACKPIPE */
644 if (t->t_dflg & F_PIPEOUT) {
645 (void) close(pipeout[0]);
646 (void) close(pipeout[1]);
648 #endif /* BACKPIPE */
650 * Perform a builtin function. If we are not forked, arrange for
659 if (t->t_dtyp != NODE_PAREN) {
664 * For () commands must put new 0,1,2 in FSH* and recurse
666 OLDSTD = dcopy(0, FOLDSTD);
667 SHOUT = dcopy(1, FSHOUT);
668 isoutatty = isatty(SHOUT);
669 SHDIAG = dcopy(2, FSHDIAG);
670 isdiagatty = isatty(SHDIAG);
673 #ifndef CLOSE_ON_EXEC
675 #endif /* !CLOSE_ON_EXEC */
678 t->t_dspr->t_dflg |= t->t_dflg & F_NOINTERRUPT;
679 execute(t->t_dspr, wanttty, NULL, NULL, do_glob);
684 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
685 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT));
686 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
687 t->t_dcar->t_dflg |= F_PIPEOUT |
688 (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
689 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
690 #else /* !BACKPIPE */
691 t->t_dcar->t_dflg |= F_PIPEOUT |
692 (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
693 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
694 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
695 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT));
696 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
697 #endif /* BACKPIPE */
702 t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
703 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
705 * In strange case of A&B make a new job after A
707 if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr &&
708 (t->t_dcdr->t_dflg & F_AMPERSAND) == 0)
712 t->t_dcdr->t_dflg |= t->t_dflg &
713 (F_NOFORK | F_NOINTERRUPT);
714 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
721 t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
722 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
723 if ((getn(varval(STRstatus)) == 0) !=
724 (t->t_dtyp == NODE_AND)) {
729 t->t_dcdr->t_dflg |= t->t_dflg &
730 (F_NOFORK | F_NOINTERRUPT);
731 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
739 * Fall through for all breaks from switch
741 * If there will be no more executions of this command, flush all file
742 * descriptors. Places that turn on the F_REPEAT bit are responsible for
743 * doing donefds after the last re-execution
745 if (didfds && !(t->t_dflg & F_REPEAT))
758 if ((v = gargv) != 0) {
763 if ((v = pargv) != 0) {
777 * Expand and glob the words after an i/o redirection.
778 * If more than one word is generated, then update the command vector.
780 * This is done differently in all the shells:
781 * 1. in the bourne shell and ksh globbing is not performed
782 * 2. Bash/csh say ambiguous
783 * 3. zsh does i/o to/from all the files
784 * 4. itcsh concatenates the words.
786 * I don't know what is best to do. I think that Ambiguous is better
787 * than restructuring the command vector, because the user can get
788 * unexpected results. In any case, the command vector restructuring
789 * code is present and the user can choose it by setting noambiguous
793 register struct command *t;
794 Char *cp; /* word after < or > */
798 if (adrof(STRnoambiguous)) {
801 blk[0] = Dfix1(cp); /* expand $ */
804 gflag = 0, tglob(blk);
808 setname(short2str(blk[0]));
809 xfree((ptr_t) blk[0]);
810 stderror(ERR_NAME | ERR_NOMATCH);
813 if (pv[1] != NULL) { /* we need to fix the command vector */
814 Char **av = blkspl(t->t_dcom, &pv[1]);
815 xfree((ptr_t) t->t_dcom);
818 xfree((ptr_t) blk[0]);
826 (void) Strcpy(buf, blk[1] = Dfix1(cp));
827 xfree((ptr_t) blk[1]);
828 blk[0] = globone(buf, G_ERROR);
834 * Perform io redirection.
835 * We may or maynot be forked here.
838 doio(t, pipein, pipeout)
839 register struct command *t;
840 int *pipein, *pipeout;
844 register unsigned long flags = t->t_dflg;
846 if (didfds || (flags & F_REPEAT))
848 if ((flags & F_READ) == 0) {/* F_READ already done */
850 char tmp[MAXPATHLEN+1];
853 * so < /dev/std{in,out,err} work
855 (void) dcopy(SHIN, 0);
856 (void) dcopy(SHOUT, 1);
857 (void) dcopy(SHDIAG, 2);
858 cp = splicepipe(t, t->t_dlef);
859 (void) strncpy(tmp, short2str(cp), MAXPATHLEN);
860 tmp[MAXPATHLEN] = '\0';
862 if ((fd = open(tmp, O_RDONLY)) < 0)
863 stderror(ERR_SYSTEM, tmp, strerror(errno));
865 /* allow input files larger than 2Gb */
866 (void) fcntl(fd, O_LARGEFILE, 0);
867 #endif /* O_LARGEFILE */
870 else if (flags & F_PIPEIN) {
872 (void) dup(pipein[0]);
873 (void) close(pipein[0]);
874 (void) close(pipein[1]);
876 else if ((flags & F_NOINTERRUPT) && tpgrp == -1) {
878 (void) open(_PATH_DEVNULL, O_RDONLY);
883 #if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
885 * PWP: Unlike Bezerkeley 4.3, FIONCLEX for Pyramid is preserved
886 * across dup()s, so we have to UNSET it here or else we get a
887 * command with NO stdin, stdout, or stderr at all (a bad thing
890 (void) close_on_exec(0, 0);
891 #endif /* CLOSE_ON_EXEC && CLEX_DUPS */
895 char tmp[MAXPATHLEN+1];
897 cp = splicepipe(t, t->t_drit);
898 (void) strncpy(tmp, short2str(cp), MAXPATHLEN);
899 tmp[MAXPATHLEN] = '\0';
902 * so > /dev/std{out,err} work
904 (void) dcopy(SHOUT, 1);
905 (void) dcopy(SHDIAG, 2);
906 if ((flags & F_APPEND) != 0) {
908 fd = open(tmp, O_WRONLY | O_APPEND);
909 #else /* !O_APPEND */
910 fd = open(tmp, O_WRONLY);
911 (void) lseek(fd, (off_t) 0, L_XTND);
912 #endif /* O_APPEND */
916 if ((flags & F_APPEND) == 0 || fd == -1) {
917 if (!(flags & F_OVERWRITE) && adrof(STRnoclobber)) {
918 if (flags & F_APPEND)
919 stderror(ERR_SYSTEM, tmp, strerror(errno));
922 if ((fd = creat(tmp, 0666)) < 0)
923 stderror(ERR_SYSTEM, tmp, strerror(errno));
925 /* allow input files larger than 2Gb */
926 (void) fcntl(fd, O_LARGEFILE, 0);
927 #endif /* O_LARGEFILE */
932 else if (flags & F_PIPEOUT) {
934 (void) dup(pipeout[1]);
941 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
942 (void) close_on_exec(1, 0);
943 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
947 if (flags & F_STDERR) {
953 is2atty = isdiagatty;
954 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
955 (void) close_on_exec(2, 0);
956 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
968 pv[0] = dmove(pv[0], -1);
969 pv[1] = dmove(pv[1], -1);
970 if (pv[0] >= 0 && pv[1] >= 0)
982 if (stat(cp, &stb) < 0)
984 if (S_ISCHR(stb.st_mode))
986 stderror(ERR_EXISTS, cp);