1 /* $Header: /p/tcsh/cvsroot/tcsh/sh.sem.c,v 3.78 2006/10/14 17:23:39 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("$tcsh: sh.sem.c,v 3.78 2006/10/14 17:23:39 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) && !defined(__GNU__) && !defined(__GLIBC__)
55 # endif /* !MACH && SYSVREL == 0 && !Lynx && !BSD4_4 && !glibc */
56 #endif /* __sparc__ || sparc */
59 static void vffree (int);
61 static Char *splicepipe (struct command *, Char *);
62 static void doio (struct command *, int *, int *);
63 static void chkclob (const 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(struct command *t, volatile int wanttty, int *pipein, int *pipeout,
91 const struct biltins * volatile bifunc;
95 static sigset_t csigset;
97 static int onosigchld = 0;
99 static int nosigchld = 0;
110 if ((varval(STRNTslowexec) == STRNULL) &&
111 !t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds &&
112 (intty || intact) && (t->t_dtyp == NODE_COMMAND) &&
114 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
115 (void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
117 if (nt_try_fast_exec(t) == 0)
121 #endif /* WINNT_NATIVE */
124 * Ed hutchins@sgi.com & Dominic dbg@sgi.com
125 * Sat Feb 25 03:13:11 PST 1995
126 * try implicit cd if we have a 1 word command
128 if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] &&
129 t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) {
134 sCName = dollar(t->t_dcom[0]);
135 if (sCName != NULL && sCName[0] == '~') {
136 struct Strbuf buf = Strbuf_INIT;
137 const Char *name_end;
139 for (name_end = sCName + 1; *name_end != '\0' && *name_end != '/';
142 if (name_end != sCName + 1) {
145 name = Strnsave(sCName + 1, name_end - (sCName + 1));
146 home = gethdir(name);
148 Strbuf_append(&buf, home);
151 Strbuf_append(&buf, name);
154 Strbuf_append(&buf, varval(STRhome));
155 Strbuf_append(&buf, name_end);
157 sCName = Strbuf_finish(&buf);
160 pathname = short2str(sCName);
162 /* if this is a dir, tack a "cd" on as the first arg */
163 if (pathname != NULL &&
164 ((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode))
166 || (pathname[0] && pathname[1] == ':' && pathname[2] == '\0')
167 #endif /* WINNT_NATIVE */
170 Char **ot_dcom = t->t_dcom;
172 vCD[0] = Strsave(STRcd);
174 t->t_dcom = blkspl(vCD, ot_dcom);
176 if (implicit_cd > 1) {
184 * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
185 * Don't check for wantty > 0...
187 if (t->t_dflg & F_AMPERSAND)
192 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
193 memmove(t->t_dcom[0], t->t_dcom[0] + 1,
194 (Strlen(t->t_dcom[0] + 1) + 1) * sizeof (*t->t_dcom[0]));
195 if ((t->t_dflg & F_REPEAT) == 0)
196 Dfix(t); /* $ " ' \ */
197 if (t->t_dcom[0] == 0) {
204 if (t->t_dflg & F_PIPEIN)
206 #else /* !BACKPIPE */
207 if (t->t_dflg & F_PIPEOUT)
209 #endif /* BACKPIPE */
211 * Must do << early so parent will know where input pointer should be.
212 * If noexec then this is all we do.
214 if (t->t_dflg & F_READ) {
221 setcopy(STRstatus, STR0, VAR_READWRITE);
224 * This mess is the necessary kludge to handle the prefix builtins:
225 * nice, nohup, time. These commands can also be used by themselves,
226 * and this is not handled here. This will also work when loops are
229 while (t->t_dtyp == NODE_COMMAND)
230 if (eq(t->t_dcom[0], STRnice)) {
232 if (strchr("+-", t->t_dcom[1][0])) {
237 lshift(t->t_dcom, 2);
245 lshift(t->t_dcom, 1);
252 else if (eq(t->t_dcom[0], STRnohup)) {
254 t->t_dflg |= F_NOHUP;
255 lshift(t->t_dcom, 1);
260 else if (eq(t->t_dcom[0], STRhup)) {
263 lshift(t->t_dcom, 1);
268 else if (eq(t->t_dcom[0], STRtime)) {
271 lshift(t->t_dcom, 1);
277 else if (eq(t->t_dcom[0], STRver))
278 if (t->t_dcom[1] && t->t_dcom[2]) {
280 t->t_systype = getv(t->t_dcom[1]);
281 lshift(t->t_dcom, 2);
290 /* is it a command */
291 if (t->t_dtyp == NODE_COMMAND) {
293 * Check if we have a builtin function and remember which one.
298 * Continue for builtins that are part of the scripting language
302 if (bifunc->bfunct != (bfunc_t)dobreak &&
303 bifunc->bfunct != (bfunc_t)docontin &&
304 bifunc->bfunct != (bfunc_t)doelse &&
305 bifunc->bfunct != (bfunc_t)doend &&
306 bifunc->bfunct != (bfunc_t)doforeach&&
307 bifunc->bfunct != (bfunc_t)dogoto &&
308 bifunc->bfunct != (bfunc_t)doif &&
309 bifunc->bfunct != (bfunc_t)dorepeat &&
310 bifunc->bfunct != (bfunc_t)doswbrk &&
311 bifunc->bfunct != (bfunc_t)doswitch &&
312 bifunc->bfunct != (bfunc_t)dowhile &&
313 bifunc->bfunct != (bfunc_t)dozip)
317 else { /* not a command */
324 * GrP Executing a command - run jobcmd hook
325 * Don't run for builtins
326 * Don't run if we're not in a tty
327 * Don't run if we're not really executing
329 if (t->t_dtyp == NODE_COMMAND && !bifunc && !noexec && intty) {
330 Char *cmd = unparse(t);
332 cleanup_push(cmd, xfree);
338 * We fork only if we are timed, or are not the end of a parenthesized
339 * list and not a simple builtin function. Simple meaning one that is
340 * not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
341 * fork in some of these cases.
344 * Prevent forking cd, pushd, popd, chdir cause this will cause the
345 * shell not to change dir!
349 * Can't have NOFORK for the tail of a pipe - because it is not the
350 * last command spawned (even if it is at the end of a parenthesised
353 if (t->t_dflg & F_PIPEIN)
354 t->t_dflg &= ~(F_NOFORK);
355 #endif /* BACKPIPE */
356 if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd ||
357 bifunc->bfunct == (bfunc_t)dopushd ||
358 bifunc->bfunct == (bfunc_t)dopopd))
359 t->t_dflg &= ~(F_NICE);
360 if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
361 (!bifunc || t->t_dflg &
362 (F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) ||
364 * We have to fork for eval too.
366 (bifunc && (t->t_dflg & F_PIPEIN) != 0 &&
367 bifunc->bfunct == (bfunc_t)doeval)) {
369 if (t->t_dtyp == NODE_PAREN ||
370 t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc)
375 * We need to block SIGCHLD here, so that if the process does
376 * not die before we can set the process group
378 if (wanttty >= 0 && !nosigchld) {
380 sigaddset(&set, SIGCHLD);
381 (void)sigprocmask(SIG_BLOCK, &set, &csigset);
386 pid = pfork(t, wanttty);
387 if (pid == 0 && nosigchld) {
388 sigprocmask(SIG_SETMASK, &csigset, NULL);
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;
400 sigset_t oset, ocsigset;
401 # ifndef CLOSE_ON_EXEC
403 # endif /* !CLOSE_ON_EXEC */
406 * Prepare for the vfork by saving everything that the child
407 * corrupts before it exec's. Note that in some signal
408 * implementations which keep the signal info in user space
409 * (e.g. Sun's) it will also be necessary to save and restore
410 * the current sigvec's for the signals the child touches
415 * Sooooo true... If this is a Sun, save the sigvec's. (Skip
416 * Gilbrech - 11/22/87)
419 struct sigaction savesv[NSIGSAVED];
422 # endif /* SAVESIGVEC */
423 if (wanttty >= 0 && !nosigchld && !noexec) {
425 sigaddset(&set, SIGCHLD);
426 (void)sigprocmask(SIG_BLOCK, &set, &csigset);
430 sigaddset(&set, SIGCHLD);
431 sigaddset(&set, SIGINT);
432 (void)sigprocmask(SIG_BLOCK, &set, &oset);
437 # ifndef CLOSE_ON_EXEC
439 # endif /* !CLOSE_ON_EXEC */
445 oisoutatty = isoutatty;
446 oisdiagatty = isdiagatty;
448 onosigchld = nosigchld;
453 savesigvec(savesv, savesm);
454 # endif /* SAVESIGVEC */
462 restoresigvec(savesv, savesm);
463 # endif /* SAVESIGVEC */
464 sigprocmask(SIG_SETMASK, &oset, NULL);
465 stderror(ERR_NOPROC);
468 if (pid) { /* parent */
470 restoresigvec(savesv, savesm);
471 # endif /* SAVESIGVEC */
477 # ifndef CLOSE_ON_EXEC
479 # endif /* !CLOSE_ON_EXEC */
484 isoutatty = oisoutatty;
485 isdiagatty = oisdiagatty;
487 nosigchld = onosigchld;
497 /* this is from pfork() */
499 sigprocmask(SIG_SETMASK, &oset, NULL);
502 /* this is from pfork() */
506 sigprocmask(SIG_SETMASK, &csigset, NULL);
511 ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
512 || (gointr && eq(gointr, STRminus));
513 pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
518 * casts made right for SunOS 4.0 by Douglas C. Schmidt
519 * <schmidt%sunshine.ics.uci.edu@ROME.ICS.UCI.EDU>
522 * ignint ifs cleaned by Johan Widen <mcvax!osiris.sics.se!jw@uunet.UU.NET>
526 (void) signal(SIGINT, SIG_IGN);
527 (void) signal(SIGQUIT, SIG_IGN);
530 (void) signal(SIGINT, vffree);
531 (void) signal(SIGQUIT, SIG_DFL);
535 (void) signal(SIGTSTP, SIG_DFL);
536 (void) signal(SIGTTIN, SIG_DFL);
537 (void) signal(SIGTTOU, SIG_DFL);
539 # endif /* BSDJOBS */
541 sigaction(SIGTERM, &parterm, NULL);
543 else if (tpgrp == -1 &&
544 (t->t_dflg & F_NOINTERRUPT)) {
545 (void) signal(SIGINT, SIG_IGN);
546 (void) signal(SIGQUIT, SIG_IGN);
549 pgetty(wanttty, pgrp);
551 if (t->t_dflg & F_NOHUP)
552 (void) signal(SIGHUP, SIG_IGN);
553 if (t->t_dflg & F_HUP)
554 (void) signal(SIGHUP, SIG_DFL);
555 if (t->t_dflg & F_NICE) {
556 int nval = SIGN_EXTEND_CHAR(t->t_nice);
557 # ifdef HAVE_SETPRIORITY
558 if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
559 stderror(ERR_SYSTEM, "setpriority",
561 # else /* !HAVE_SETPRIORITY */
563 # endif /* HAVE_SETPRIORITY */
566 if (t->t_dflg & F_VER) {
567 tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
578 * It would be better if we could wait for the whole job when we
579 * knew the last process had been started. Pwait, in fact, does
580 * wait for the whole job anyway, but this test doesn't really
581 * express our intentions.
584 if (didfds == 0 && t->t_dflg & F_PIPEOUT) {
588 if ((t->t_dflg & F_PIPEIN) != 0)
590 #else /* !BACKPIPE */
591 if (didfds == 0 && t->t_dflg & F_PIPEIN) {
595 if ((t->t_dflg & F_PIPEOUT) != 0)
597 #endif /* BACKPIPE */
600 sigprocmask(SIG_SETMASK, &csigset, NULL);
603 if ((t->t_dflg & F_AMPERSAND) == 0)
608 doio(t, pipein, pipeout);
610 if (t->t_dflg & F_PIPEIN) {
614 #else /* !BACKPIPE */
615 if (t->t_dflg & F_PIPEOUT) {
619 #endif /* BACKPIPE */
621 * Perform a builtin function. If we are not forked, arrange for
629 if (adrof(STRprintexitvalue)) {
630 int rv = getn(varval(STRstatus));
632 xprintf(CGETS(17, 2, "Exit %d\n"), rv);
637 if (t->t_dtyp != NODE_PAREN) {
642 * For () commands must put new 0,1,2 in FSH* and recurse
644 (void)close_on_exec(OLDSTD = dcopy(0, FOLDSTD), 1);
645 (void)close_on_exec(SHOUT = dcopy(1, FSHOUT), 1);
646 isoutatty = isatty(SHOUT);
647 (void)close_on_exec(SHDIAG = dcopy(2, FSHDIAG), 1);
648 isdiagatty = isatty(SHDIAG);
651 #ifndef CLOSE_ON_EXEC
654 (void) close_on_exec(FSHOUT, 1);
655 (void) close_on_exec(FSHDIAG, 1);
656 (void) close_on_exec(FOLDSTD, 1);
657 #endif /* !CLOSE_ON_EXEC */
660 t->t_dspr->t_dflg |= t->t_dflg & F_NOINTERRUPT;
661 execute(t->t_dspr, wanttty, NULL, NULL, do_glob);
666 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
667 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT));
668 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
669 t->t_dcar->t_dflg |= F_PIPEOUT |
670 (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
671 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
672 #else /* !BACKPIPE */
673 t->t_dcar->t_dflg |= F_PIPEOUT |
674 (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
675 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
676 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
677 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT));
678 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
679 #endif /* BACKPIPE */
684 t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
685 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
687 * In strange case of A&B make a new job after A
689 if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr &&
690 (t->t_dcdr->t_dflg & F_AMPERSAND) == 0)
694 t->t_dcdr->t_dflg |= t->t_dflg &
695 (F_NOFORK | F_NOINTERRUPT);
696 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
703 t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
704 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
705 if ((getn(varval(STRstatus)) == 0) !=
706 (t->t_dtyp == NODE_AND)) {
711 t->t_dcdr->t_dflg |= t->t_dflg &
712 (F_NOFORK | F_NOINTERRUPT);
713 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
721 * Fall through for all breaks from switch
723 * If there will be no more executions of this command, flush all file
724 * descriptors. Places that turn on the F_REPEAT bit are responsible for
725 * doing donefds after the last re-execution
727 if (didfds && !(t->t_dflg & F_REPEAT))
743 * Expand and glob the words after an i/o redirection.
744 * If more than one word is generated, then update the command vector.
746 * This is done differently in all the shells:
747 * 1. in the bourne shell and ksh globbing is not performed
748 * 2. Bash/csh say ambiguous
749 * 3. zsh does i/o to/from all the files
750 * 4. itcsh concatenates the words.
752 * I don't know what is best to do. I think that Ambiguous is better
753 * than restructuring the command vector, because the user can get
754 * unexpected results. In any case, the command vector restructuring
755 * code is present and the user can choose it by setting noambiguous
758 splicepipe(struct command *t, Char *cp)
762 if (adrof(STRnoambiguous)) {
766 blk[0] = Dfix1(cp); /* expand $ */
771 pv = globall(blk, gflag);
773 setname(short2str(blk[0]));
775 stderror(ERR_NAME | ERR_NOMATCH);
777 if (pv[1] != NULL) { /* we need to fix the command vector */
778 Char **av = blkspl(t->t_dcom, &pv[1]);
791 cleanup_push(buf, xfree);
792 blk[0] = globone(buf, G_ERROR);
799 * Perform io redirection.
800 * We may or maynot be forked here.
803 doio(struct command *t, int *pipein, int *pipeout)
807 unsigned long flags = t->t_dflg;
809 if (didfds || (flags & F_REPEAT))
811 if ((flags & F_READ) == 0) {/* F_READ already done */
816 * so < /dev/std{in,out,err} work
818 (void) dcopy(SHIN, 0);
819 (void) dcopy(SHOUT, 1);
820 (void) dcopy(SHDIAG, 2);
821 cp = splicepipe(t, t->t_dlef);
822 tmp = strsave(short2str(cp));
824 cleanup_push(tmp, xfree);
825 if ((fd = xopen(tmp, O_RDONLY|O_LARGEFILE)) < 0)
826 stderror(ERR_SYSTEM, tmp, strerror(errno));
828 /* allow input files larger than 2Gb */
830 (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
831 #endif /*!WINNT_NATIVE*/
834 else if (flags & F_PIPEIN) {
836 (void) dup(pipein[0]);
840 else if ((flags & F_NOINTERRUPT) && tpgrp == -1) {
842 (void) xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
847 #if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
849 * PWP: Unlike Bezerkeley 4.3, FIONCLEX for Pyramid is preserved
850 * across dup()s, so we have to UNSET it here or else we get a
851 * command with NO stdin, stdout, or stderr at all (a bad thing
854 (void) close_on_exec(0, 0);
855 #endif /* CLOSE_ON_EXEC && CLEX_DUPS */
861 cp = splicepipe(t, t->t_drit);
862 tmp = strsave(short2str(cp));
864 cleanup_push(tmp, xfree);
866 * so > /dev/std{out,err} work
868 (void) dcopy(SHOUT, 1);
869 (void) dcopy(SHDIAG, 2);
870 if ((flags & F_APPEND) != 0) {
872 fd = xopen(tmp, O_WRONLY|O_APPEND|O_LARGEFILE);
873 #else /* !O_APPEND */
874 fd = xopen(tmp, O_WRONLY|O_LARGEFILE);
875 (void) lseek(fd, (off_t) 0, L_XTND);
876 #endif /* O_APPEND */
880 if ((flags & F_APPEND) == 0 || fd == -1) {
881 if (!(flags & F_OVERWRITE) && adrof(STRnoclobber)) {
882 if (flags & F_APPEND)
883 stderror(ERR_SYSTEM, tmp, strerror(errno));
886 if ((fd = xcreat(tmp, 0666)) < 0)
887 stderror(ERR_SYSTEM, tmp, strerror(errno));
888 /* allow input files larger than 2Gb */
890 (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
891 #endif /*!WINNT_NATIVE*/
897 else if (flags & F_PIPEOUT) {
899 (void) dup(pipeout[1]);
906 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
907 (void) close_on_exec(1, 0);
908 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
912 if (flags & F_STDERR) {
918 is2atty = isdiagatty;
919 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
920 (void) close_on_exec(2, 0);
921 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
932 (void)close_on_exec(pv[0] = dmove(pv[0], -1), 1);
933 (void)close_on_exec(pv[1] = dmove(pv[1], -1), 1);
934 if (pv[0] >= 0 && pv[1] >= 0)
945 chkclob(const char *cp)
949 if (stat(cp, &stb) < 0)
951 if (S_ISCHR(stb.st_mode))
953 stderror(ERR_EXISTS, cp);