1 files changed, 0 insertions, 975 deletions
diff --git a/contrib/tcsh/sh.sem.c b/contrib/tcsh/sh.sem.c
deleted file mode 100644
index 4f4a6374dd03..000000000000
--- a/contrib/tcsh/sh.sem.c
+++ /dev/null
@@ -1,975 +0,0 @@
-/* $Header: /src/pub/tcsh/sh.sem.c,v 3.48 1998/11/24 18:17:37 christos Exp $ */
-/*
- * sh.sem.c: I/O redirections and job forking. A touchy issue!
- *	     Most stuff with builtins is incorrect
- */
-/*-
- * Copyright (c) 1980, 1991 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
- *	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-#include "sh.h"
-
-RCSID("$Id: sh.sem.c,v 3.48 1998/11/24 18:17:37 christos Exp $")
-
-#include "tc.h"
-#include "tw.h"
-#ifdef WINNT
-#include "nt.const.h"
-#endif /*WINNT*/
-
-#ifdef CLOSE_ON_EXEC
-# ifndef SUNOS4
-#  ifndef CLEX_DUPS
-#   define CLEX_DUPS
-#  endif /* CLEX_DUPS */
-# endif /* !SUNOS4 */
-#endif /* CLOSE_ON_EXEC */
-
-#if defined(__sparc__) || defined(sparc)
-# if !defined(MACH) && SYSVREL == 0 && !defined(Lynx) && !defined(BSD4_4) && !defined(linux)
-#  include <vfork.h>
-# endif /* !MACH && SYSVREL == 0 && !Lynx && !BSD4_4 && !linux */
-#endif /* __sparc__ || sparc */
-
-#ifdef VFORK
-static	sigret_t	vffree	__P((int));
-#endif 
-static	Char		*splicepipe	__P((struct command *, Char *));
-static	void		 doio		__P((struct command *, int *, int *));
-static	void		 chkclob	__P((char *));
-
-/*
- * C shell
- */
-
-/*
- * For SVR4, there are problems with pipelines having the first process as
- * the group leader.  The problem occurs when the first process exits before
- * the others have a chance to setpgid().  This is because in SVR4 you can't
- * have a zombie as a group leader.  The solution I have used is to reverse
- * the order in which pipelines are started, making the last process the
- * group leader.  (Note I am not using 'pipeline' in the generic sense -- I
- * mean processes connected by '|'.)  I don't know yet if this causes other
- * problems.
- *
- * All the changes for this are in execute(), and are enclosed in 
- * '#ifdef BACKPIPE'
- *
- * David Dawes (dawes@physics.su.oz.au) Oct 1991
- */
-
-/*VARARGS 1*/
-void
-execute(t, wanttty, pipein, pipeout)
-    register struct command *t;
-    int     wanttty;
-    int *pipein, *pipeout;
-{
-#ifdef VFORK
-    extern bool use_fork;	/* use fork() instead of vfork()? */
-#endif
-
-    bool    forked = 0;
-    struct biltins *bifunc;
-    int     pid = 0;
-    int     pv[2];
-#ifdef BSDSIGS
-    static sigmask_t csigmask;
-#endif /* BSDSIGS */
-#ifdef VFORK
-    static int onosigchld = 0;
-#endif /* VFORK */
-    static int nosigchld = 0;
-
-    (void) &wanttty;
-    (void) &forked;
-    (void) &bifunc;
-
-    if (t == 0) 
-	return;
-
-#ifdef WINNT
-    {
-        if ((varval(STRNTslowexec) == STRNULL) &&
-            !t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds &&
-            (intty || intact) && (t->t_dtyp == NODE_COMMAND) &&
-	    !isbfunc(t)) {
-	    if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
-		(void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
-	    Dfix(t);
-            if (nt_try_fast_exec(t) == 0)
-                return;
-        }
-    }
-#endif /* WINNT */
-
-    /*
-     * Ed hutchins@sgi.com & Dominic dbg@sgi.com
-     * Sat Feb 25 03:13:11 PST 1995
-     * try implicit cd if we have a 1 word command 
-     */
-    if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] &&
-	 t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) {
-	Char sCName[MAXPATHLEN];
-	Char *pCN;
-	struct stat stbuf;
-	char *pathname;
-
-	dollar(sCName, t->t_dcom[0]);
-	pCN = sCName;
-	if (pCN[0] == '~') {
-	    Char sCPath[MAXPATHLEN];
-	    Char *pCP = sCPath;
-
-	    ++pCN;
-	    while (*pCN && *pCN != '/')
-		*pCP++ = *pCN++;
-	    *pCP = 0;
-	    if (sCPath[0])
-		gethdir(sCPath);
-	    else
-		(void) Strcpy(sCPath, varval(STRhome));
-	    catn(sCPath, pCN, MAXPATHLEN);
-	    (void) Strcpy(sCName, sCPath);
-	}
-    
-	pathname = short2str(sCName);
-	/* if this is a dir, tack a "cd" on as the first arg */
-	if ((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode))
-#ifdef WINNT
-	    || (pathname[0] && pathname[1] == ':' && pathname[2] == '\0')
-#endif /* WINNT */
-	) {
-	    Char *vCD[2];
-	    Char **ot_dcom = t->t_dcom;
-	
-	    vCD[0] = Strsave(STRcd);
-	    vCD[1] = NULL;
-	    t->t_dcom = blkspl(vCD, ot_dcom);
-	    if (implicit_cd > 1) {
-		blkpr(t->t_dcom);
-		xputchar( '\n' );
-	    }
-	    xfree((ptr_t) ot_dcom);
-	}
-    }
-
-    /*
-     * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
-     * Don't check for wantty > 0...
-     */
-    if (t->t_dflg & F_AMPERSAND)
-	wanttty = 0;
-    switch (t->t_dtyp) {
-
-    case NODE_COMMAND:
-	if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
-	    (void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
-	if ((t->t_dflg & F_REPEAT) == 0)
-	    Dfix(t);		/* $ " ' \ */
-	if (t->t_dcom[0] == 0) {
-	    return;
-	}
-	/*FALLTHROUGH*/
-
-    case NODE_PAREN:
-#ifdef BACKPIPE
-	if (t->t_dflg & F_PIPEIN)
-	    mypipe(pipein);
-#else /* !BACKPIPE */
-	if (t->t_dflg & F_PIPEOUT)
-	    mypipe(pipeout);
-#endif /* BACKPIPE */
-	/*
-	 * Must do << early so parent will know where input pointer should be.
-	 * If noexec then this is all we do.
-	 */
-	if (t->t_dflg & F_READ) {
-	    (void) close(0);
-	    heredoc(t->t_dlef);
-	    if (noexec)
-		(void) close(0);
-	}
-
-	set(STRstatus, Strsave(STR0), VAR_READWRITE);
-
-	/*
-	 * This mess is the necessary kludge to handle the prefix builtins:
-	 * nice, nohup, time.  These commands can also be used by themselves,
-	 * and this is not handled here. This will also work when loops are
-	 * parsed.
-	 */
-	while (t->t_dtyp == NODE_COMMAND)
-	    if (eq(t->t_dcom[0], STRnice)) {
-		if (t->t_dcom[1]) {
-		    if (strchr("+-", t->t_dcom[1][0])) {
-			if (t->t_dcom[2]) {
-			    setname("nice");
-			    t->t_nice =
-				getn(t->t_dcom[1]);
-			    lshift(t->t_dcom, 2);
-			    t->t_dflg |= F_NICE;
-			}
-			else
-			    break;
-		    }
-		    else {
-			t->t_nice = 4;
-			lshift(t->t_dcom, 1);
-			t->t_dflg |= F_NICE;
-		    }
-		}
-		else
-		    break;
-	    }
-	    else if (eq(t->t_dcom[0], STRnohup)) {
-		if (t->t_dcom[1]) {
-		    t->t_dflg |= F_NOHUP;
-		    lshift(t->t_dcom, 1);
-		}
-		else
-		    break;
-	    }
-	    else if (eq(t->t_dcom[0], STRhup)) {
-		if (t->t_dcom[1]) {
-		    t->t_dflg |= F_HUP;
-		    lshift(t->t_dcom, 1);
-		}
-		else
-		    break;
-	    }
-	    else if (eq(t->t_dcom[0], STRtime)) {
-		if (t->t_dcom[1]) {
-		    t->t_dflg |= F_TIME;
-		    lshift(t->t_dcom, 1);
-		}
-		else
-		    break;
-	    }
-#ifdef F_VER
-	    else if (eq(t->t_dcom[0], STRver))
-		if (t->t_dcom[1] && t->t_dcom[2]) {
-		    setname("ver");
-		    t->t_systype = getv(t->t_dcom[1]);
-		    lshift(t->t_dcom, 2);
-		    t->t_dflg |= F_VER;
-		}
-		else
-		    break;
-#endif  /* F_VER */
-	    else
-		break;
-
-	/* is it a command */
-	if (t->t_dtyp == NODE_COMMAND) {
-	    /*
-	     * Check if we have a builtin function and remember which one.
-	     */
-	    bifunc = isbfunc(t);
- 	    if (noexec && bifunc) {
-		/*
-		 * Continue for builtins that are part of the scripting language
-		 */
-		if (bifunc->bfunct != (bfunc_t)dobreak	&&
-		    bifunc->bfunct != (bfunc_t)docontin	&&
-		    bifunc->bfunct != (bfunc_t)doelse	&&
-		    bifunc->bfunct != (bfunc_t)doend	&&
-		    bifunc->bfunct != (bfunc_t)doforeach&&
-		    bifunc->bfunct != (bfunc_t)dogoto	&&
-		    bifunc->bfunct != (bfunc_t)doif	&&
-		    bifunc->bfunct != (bfunc_t)dorepeat	&&
-		    bifunc->bfunct != (bfunc_t)doswbrk	&&
-		    bifunc->bfunct != (bfunc_t)doswitch	&&
-		    bifunc->bfunct != (bfunc_t)dowhile	&&
-		    bifunc->bfunct != (bfunc_t)dozip)
-		    break;
-	    }
-	}
-	else {			/* not a command */
-	    bifunc = NULL;
-	    if (noexec)
-		break;
-	}
-
-	/*
-	 * We fork only if we are timed, or are not the end of a parenthesized
-	 * list and not a simple builtin function. Simple meaning one that is
-	 * not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
-	 * fork in some of these cases.
-	 */
-	/*
-	 * Prevent forking cd, pushd, popd, chdir cause this will cause the
-	 * shell not to change dir!
-	 */
-#ifdef BACKPIPE
-	/*
-	 * Can't have NOFORK for the tail of a pipe - because it is not the
-	 * last command spawned (even if it is at the end of a parenthesised
-	 * list).
-	 */
-	if (t->t_dflg & F_PIPEIN)
-	    t->t_dflg &= ~(F_NOFORK);
-#endif /* BACKPIPE */
-	if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd ||
-		       bifunc->bfunct == (bfunc_t)dopushd ||
-		       bifunc->bfunct == (bfunc_t)dopopd))
-	    t->t_dflg &= ~(F_NICE);
-	if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
-	     (!bifunc || t->t_dflg &
-	      (F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) ||
-	/*
-	 * We have to fork for eval too.
-	 */
-	    (bifunc && (t->t_dflg & F_PIPEIN) != 0 &&
-	     bifunc->bfunct == (bfunc_t)doeval))
-#ifdef VFORK
-	    if (t->t_dtyp == NODE_PAREN ||
-		t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc)
-#endif /* VFORK */
-	    {
-		forked++;
-		/*
-		 * We need to block SIGCHLD here, so that if the process does
-		 * not die before we can set the process group
-		 */
-		if (wanttty >= 0 && !nosigchld) {
-#ifdef BSDSIGS
-		    csigmask = sigblock(sigmask(SIGCHLD));
-#else /* !BSDSIGS */
-		    (void) sighold(SIGCHLD);
-#endif /* BSDSIGS */
-
-		    nosigchld = 1;
-		}
-
-		pid = pfork(t, wanttty);
-		if (pid == 0 && nosigchld) {
-#ifdef BSDSIGS
-		    (void) sigsetmask(csigmask);
-#else /* !BSDSIGS */
-		    (void) sigrelse(SIGCHLD);
-#endif /* BSDSIGS */
-		    nosigchld = 0;
-		}
-		else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
-		    backpid = pid;
-	    }
-
-#ifdef VFORK
-	    else {
-		int     ochild, osetintr, ohaderr, odidfds;
-		int     oSHIN, oSHOUT, oSHDIAG, oOLDSTD, otpgrp;
-		int     oisoutatty, oisdiagatty;
-
-# ifndef CLOSE_ON_EXEC
-		int     odidcch;
-# endif  /* !CLOSE_ON_EXEC */
-# ifdef BSDSIGS
-		sigmask_t omask, ocsigmask;
-# endif /* BSDSIGS */
-
-		/*
-		 * Prepare for the vfork by saving everything that the child
-		 * corrupts before it exec's. Note that in some signal
-		 * implementations which keep the signal info in user space
-		 * (e.g. Sun's) it will also be necessary to save and restore
-		 * the current sigvec's for the signals the child touches
-		 * before it exec's.
-		 */
-
-		/*
-		 * Sooooo true... If this is a Sun, save the sigvec's. (Skip
-		 * Gilbrech - 11/22/87)
-		 */
-# ifdef SAVESIGVEC
-		sigvec_t savesv[NSIGSAVED];
-		sigmask_t savesm;
-
-# endif /* SAVESIGVEC */
-		if (wanttty >= 0 && !nosigchld && !noexec) {
-# ifdef BSDSIGS
-		    csigmask = sigblock(sigmask(SIGCHLD));
-# else /* !BSDSIGS */
-		    (void) sighold(SIGCHLD);
-# endif  /* BSDSIGS */
-		    nosigchld = 1;
-		}
-# ifdef BSDSIGS
-		omask = sigblock(sigmask(SIGCHLD)|sigmask(SIGINT));
-# else /* !BSDSIGS */
-		(void) sighold(SIGCHLD);
-		(void) sighold(SIGINT);
-# endif  /* BSDSIGS */
-		ochild = child;
-		osetintr = setintr;
-		ohaderr = haderr;
-		odidfds = didfds;
-# ifndef CLOSE_ON_EXEC
-		odidcch = didcch;
-# endif /* !CLOSE_ON_EXEC */
-		oSHIN = SHIN;
-		oSHOUT = SHOUT;
-		oSHDIAG = SHDIAG;
-		oOLDSTD = OLDSTD;
-		otpgrp = tpgrp;
-		oisoutatty = isoutatty;
-		oisdiagatty = isdiagatty;
-# ifdef BSDSIGS
-		ocsigmask = csigmask;
-# endif /* BSDSIGS */
-		onosigchld = nosigchld;
-		Vsav = Vdp = 0;
-		Vexpath = 0;
-		Vt = 0;
-# ifdef SAVESIGVEC
-		savesm = savesigvec(savesv);
-# endif /* SAVESIGVEC */
-		if (use_fork)
-		    pid = fork();
-		else
-		    pid = vfork();
-
-		if (pid < 0) {
-# ifdef BSDSIGS
-#  ifdef SAVESIGVEC
-		    restoresigvec(savesv, savesm);
-#  endif /* SAVESIGVEC */
-		    (void) sigsetmask(omask);
-# else /* !BSDSIGS */
-		    (void) sigrelse(SIGCHLD);
-		    (void) sigrelse(SIGINT);
-# endif  /* BSDSIGS */
-		    stderror(ERR_NOPROC);
-		}
-		forked++;
-		if (pid) {	/* parent */
-# ifdef SAVESIGVEC
-		    restoresigvec(savesv, savesm);
-# endif /* SAVESIGVEC */
-		    child = ochild;
-		    setintr = osetintr;
-		    haderr = ohaderr;
-		    didfds = odidfds;
-		    SHIN = oSHIN;
-# ifndef CLOSE_ON_EXEC
-		    didcch = odidcch;
-# endif /* !CLOSE_ON_EXEC */
-		    SHOUT = oSHOUT;
-		    SHDIAG = oSHDIAG;
-		    OLDSTD = oOLDSTD;
-		    tpgrp = otpgrp;
-		    isoutatty = oisoutatty;
-		    isdiagatty = oisdiagatty;
-# ifdef BSDSIGS
-		    csigmask = ocsigmask;
-# endif /* BSDSIGS */
-		    nosigchld = onosigchld;
-
-		    xfree((ptr_t) Vsav);
-		    Vsav = 0;
-		    xfree((ptr_t) Vdp);
-		    Vdp = 0;
-		    xfree((ptr_t) Vexpath);
-		    Vexpath = 0;
-		    blkfree((Char **) Vt);
-		    Vt = 0;
-		    /* this is from pfork() */
-		    palloc(pid, t);
-# ifdef BSDSIGS
-		    (void) sigsetmask(omask);
-# else /* !BSDSIGS */
-		    (void) sigrelse(SIGCHLD);
-		    (void) sigrelse(SIGINT);
-# endif  /* BSDSIGS */
-		}
-		else {		/* child */
-		    /* this is from pfork() */
-		    int     pgrp;
-		    bool    ignint = 0;
-		    if (nosigchld) {
-# ifdef BSDSIGS
-			(void) sigsetmask(csigmask);
-# else /* !BSDSIGS */
-			(void) sigrelse(SIGCHLD);
-# endif /* BSDSIGS */
-			nosigchld = 0;
-		    }
-
-		    if (setintr)
-			ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
-				|| (gointr && eq(gointr, STRminus));
-		    pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
-		    child++;
-		    if (setintr) {
-			setintr = 0;
-/*
- * casts made right for SunOS 4.0 by Douglas C. Schmidt
- * <schmidt%sunshine.ics.uci.edu@ROME.ICS.UCI.EDU>
- * (thanks! -- PWP)
- *
- * ignint ifs cleaned by Johan Widen <mcvax!osiris.sics.se!jw@uunet.UU.NET>
- * (thanks again)
- */
-			if (ignint) {
-			    (void) signal(SIGINT, SIG_IGN);
-			    (void) signal(SIGQUIT, SIG_IGN);
-			}
-			else {
-			    (void) signal(SIGINT,  vffree);
-			    (void) signal(SIGQUIT, SIG_DFL);
-			}
-# ifdef BSDJOBS
-			if (wanttty >= 0) {
-			    (void) signal(SIGTSTP, SIG_DFL);
-			    (void) signal(SIGTTIN, SIG_DFL);
-			    (void) signal(SIGTTOU, SIG_DFL);
-			}
-# endif /* BSDJOBS */
-
-			(void) signal(SIGTERM, parterm);
-		    }
-		    else if (tpgrp == -1 &&
-			     (t->t_dflg & F_NOINTERRUPT)) {
-			(void) signal(SIGINT, SIG_IGN);
-			(void) signal(SIGQUIT, SIG_IGN);
-		    }
-
-		    pgetty(wanttty, pgrp);
-
-		    if (t->t_dflg & F_NOHUP)
-			(void) signal(SIGHUP, SIG_IGN);
-		    if (t->t_dflg & F_HUP)
-			(void) signal(SIGHUP, SIG_DFL);
-		    if (t->t_dflg & F_NICE) {
-			int nval = SIGN_EXTEND_CHAR(t->t_nice);
-# ifdef BSDNICE
-			(void) setpriority(PRIO_PROCESS, 0, nval);
-# else /* !BSDNICE */
-			(void) nice(nval);
-# endif /* BSDNICE */
-		    }
-# ifdef F_VER
-		    if (t->t_dflg & F_VER) {
-			tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
-			dohash(NULL, NULL);
-		    }
-# endif /* F_VER */
-		}
-
-	    }
-#endif /* VFORK */
-	if (pid != 0) {
-	    /*
-	     * It would be better if we could wait for the whole job when we
-	     * knew the last process had been started.  Pwait, in fact, does
-	     * wait for the whole job anyway, but this test doesn't really
-	     * express our intentions.
-	     */
-#ifdef BACKPIPE
-	    if (didfds == 0 && t->t_dflg & F_PIPEOUT) {
-		(void) close(pipeout[0]);
-		(void) close(pipeout[1]);
-	    }
-	    if ((t->t_dflg & F_PIPEIN) != 0)
-		break;
-#else /* !BACKPIPE */
-	    if (didfds == 0 && t->t_dflg & F_PIPEIN) {
-		(void) close(pipein[0]);
-		(void) close(pipein[1]);
-	    }
-	    if ((t->t_dflg & F_PIPEOUT) != 0)
-		break;
-#endif /* BACKPIPE */
-
-	    if (nosigchld) {
-#ifdef BSDSIGS
-		(void) sigsetmask(csigmask);
-#else /* !BSDSIGS */
-		(void) sigrelse(SIGCHLD);
-#endif /* BSDSIGS */
-		nosigchld = 0;
-	    }
-	    if ((t->t_dflg & F_AMPERSAND) == 0)
-		pwait();
-	    break;
-	}
-
-	doio(t, pipein, pipeout);
-#ifdef BACKPIPE
-	if (t->t_dflg & F_PIPEIN) {
-	    (void) close(pipein[0]);
-	    (void) close(pipein[1]);
-	}
-#else /* !BACKPIPE */
-	if (t->t_dflg & F_PIPEOUT) {
-	    (void) close(pipeout[0]);
-	    (void) close(pipeout[1]);
-	}
-#endif /* BACKPIPE */
-	/*
-	 * Perform a builtin function. If we are not forked, arrange for
-	 * possible stopping
-	 */
-	if (bifunc) {
-	    func(t, bifunc);
-	    if (forked)
-		exitstat();
-	    break;
-	}
-	if (t->t_dtyp != NODE_PAREN) {
-	    doexec(t);
-	    /* NOTREACHED */
-	}
-	/*
-	 * For () commands must put new 0,1,2 in FSH* and recurse
-	 */
-	OLDSTD = dcopy(0, FOLDSTD);
-	SHOUT = dcopy(1, FSHOUT);
-	isoutatty = isatty(SHOUT);
-	SHDIAG = dcopy(2, FSHDIAG);
-	isdiagatty = isatty(SHDIAG);
-	(void) close(SHIN);
-	SHIN = -1;
-#ifndef CLOSE_ON_EXEC
-	didcch = 0;
-#endif /* !CLOSE_ON_EXEC */
-	didfds = 0;
-	wanttty = -1;
-	t->t_dspr->t_dflg |= t->t_dflg & F_NOINTERRUPT;
-	execute(t->t_dspr, wanttty, NULL, NULL);
-	exitstat();
-
-    case NODE_PIPE:
-#ifdef BACKPIPE
-	t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
-			(F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT));
-	execute(t->t_dcdr, wanttty, pv, pipeout);
-	t->t_dcar->t_dflg |= F_PIPEOUT |
-	    (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
-	execute(t->t_dcar, wanttty, pipein, pv);
-#else /* !BACKPIPE */
-	t->t_dcar->t_dflg |= F_PIPEOUT |
-	    (t->t_dflg & (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT));
-	execute(t->t_dcar, wanttty, pipein, pv);
-	t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
-			(F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT));
-	execute(t->t_dcdr, wanttty, pv, pipeout);
-#endif /* BACKPIPE */
-	break;
-
-    case NODE_LIST:
-	if (t->t_dcar) {
-	    t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
-	    execute(t->t_dcar, wanttty, NULL, NULL);
-	    /*
-	     * In strange case of A&B make a new job after A
-	     */
-	    if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr &&
-		(t->t_dcdr->t_dflg & F_AMPERSAND) == 0)
-		pendjob();
-	}
-	if (t->t_dcdr) {
-	    t->t_dcdr->t_dflg |= t->t_dflg &
-		(F_NOFORK | F_NOINTERRUPT);
-	    execute(t->t_dcdr, wanttty, NULL, NULL);
-	}
-	break;
-
-    case NODE_OR:
-    case NODE_AND:
-	if (t->t_dcar) {
-	    t->t_dcar->t_dflg |= t->t_dflg & F_NOINTERRUPT;
-	    execute(t->t_dcar, wanttty, NULL, NULL);
-	    if ((getn(varval(STRstatus)) == 0) !=
-		(t->t_dtyp == NODE_AND)) {
-		return;
-	    }
-	}
-	if (t->t_dcdr) {
-	    t->t_dcdr->t_dflg |= t->t_dflg &
-		(F_NOFORK | F_NOINTERRUPT);
-	    execute(t->t_dcdr, wanttty, NULL, NULL);
-	}
-	break;
-
-    default:
-	break;
-    }
-    /*
-     * Fall through for all breaks from switch
-     * 
-     * If there will be no more executions of this command, flush all file
-     * descriptors. Places that turn on the F_REPEAT bit are responsible for
-     * doing donefds after the last re-execution
-     */
-    if (didfds && !(t->t_dflg & F_REPEAT))
-	donefds();
-}
-
-#ifdef VFORK
-static sigret_t
-/*ARGSUSED*/
-vffree(snum)
-int snum;
-{
-    register Char **v;
-
-    USE(snum);
-    if ((v = gargv) != 0) {
-	gargv = 0;
-	xfree((ptr_t) v);
-    }
-
-    if ((v = pargv) != 0) {
-	pargv = 0;
-	xfree((ptr_t) v);
-    }
-
-    _exit(1);
-#ifndef SIGVOID
-    /*NOTREACHED*/
-    return(0);
-#endif /* SIGVOID */
-}
-#endif /* VFORK */
-
-/*
- * Expand and glob the words after an i/o redirection.
- * If more than one word is generated, then update the command vector.
- *
- * This is done differently in all the shells:
- * 1. in the bourne shell and ksh globbing is not performed
- * 2. Bash/csh say ambiguous
- * 3. zsh does i/o to/from all the files
- * 4. itcsh concatenates the words.
- *
- * I don't know what is best to do. I think that Ambiguous is better
- * than restructuring the command vector, because the user can get
- * unexpected results. In any case, the command vector restructuring 
- * code is present and the user can choose it by setting noambiguous
- */
-static Char *
-splicepipe(t, cp)
-    register struct command *t;
-    Char *cp;	/* word after < or > */
-{
-    Char *blk[2];
-
-    if (adrof(STRnoambiguous)) {
-	Char **pv;
-
-	blk[0] = Dfix1(cp); /* expand $ */
-	blk[1] = NULL;
-
-	gflag = 0, tglob(blk);
-	if (gflag) {
-	    pv = globall(blk);
-	    if (pv == NULL) {
-		setname(short2str(blk[0]));
-		xfree((ptr_t) blk[0]);
-		stderror(ERR_NAME | ERR_NOMATCH);
-	    }
-	    gargv = NULL;
-	    if (pv[1] != NULL) { /* we need to fix the command vector */
-		Char **av = blkspl(t->t_dcom, &pv[1]);
-		xfree((ptr_t) t->t_dcom);
-		t->t_dcom = av;
-	    }
-	    xfree((ptr_t) blk[0]);
-	    blk[0] = pv[0];
-	    xfree((ptr_t) pv);
-	}
-    }
-    else {
-	Char buf[BUFSIZE];
-
-	(void) Strcpy(buf, blk[1] = Dfix1(cp));
-	xfree((ptr_t) blk[1]);
-	blk[0] = globone(buf, G_ERROR);
-    }
-    return(blk[0]);
-}
-    
-/*
- * Perform io redirection.
- * We may or maynot be forked here.
- */
-static void
-doio(t, pipein, pipeout)
-    register struct command *t;
-    int    *pipein, *pipeout;
-{
-    register int fd;
-    register Char *cp;
-    register unsigned long flags = t->t_dflg;
-
-    if (didfds || (flags & F_REPEAT))
-	return;
-    if ((flags & F_READ) == 0) {/* F_READ already done */
-	if (t->t_dlef) {
-	    char    tmp[MAXPATHLEN+1];
-
-	    /*
-	     * so < /dev/std{in,out,err} work
-	     */
-	    (void) dcopy(SHIN, 0);
-	    (void) dcopy(SHOUT, 1);
-	    (void) dcopy(SHDIAG, 2);
-	    cp = splicepipe(t, t->t_dlef);
-	    (void) strncpy(tmp, short2str(cp), MAXPATHLEN);
-	    tmp[MAXPATHLEN] = '\0';
-	    xfree((ptr_t) cp);
-	    if ((fd = open(tmp, O_RDONLY)) < 0)
-		stderror(ERR_SYSTEM, tmp, strerror(errno));
-#ifdef O_LARGEFILE
-	    /* allow input files larger than 2Gb  */
-	    (void) fcntl(fd, O_LARGEFILE, 0);
-#endif /* O_LARGEFILE */
-	    (void) dmove(fd, 0);
-	}
-	else if (flags & F_PIPEIN) {
-	    (void) close(0);
-	    (void) dup(pipein[0]);
-	    (void) close(pipein[0]);
-	    (void) close(pipein[1]);
-	}
-	else if ((flags & F_NOINTERRUPT) && tpgrp == -1) {
-	    (void) close(0);
-	    (void) open(_PATH_DEVNULL, O_RDONLY);
-	}
-	else {
-	    (void) close(0);
-	    (void) dup(OLDSTD);
-#if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
-	    /*
-	     * PWP: Unlike Bezerkeley 4.3, FIONCLEX for Pyramid is preserved
-	     * across dup()s, so we have to UNSET it here or else we get a
-	     * command with NO stdin, stdout, or stderr at all (a bad thing
-	     * indeed)
-	     */
-	    (void) close_on_exec(0, 0);
-#endif /* CLOSE_ON_EXEC && CLEX_DUPS */
-	}
-    }
-    if (t->t_drit) {
-	char    tmp[MAXPATHLEN+1];
-
-	cp = splicepipe(t, t->t_drit);
-	(void) strncpy(tmp, short2str(cp), MAXPATHLEN);
-	tmp[MAXPATHLEN] = '\0';
-	xfree((ptr_t) cp);
-	/*
-	 * so > /dev/std{out,err} work
-	 */
-	(void) dcopy(SHOUT, 1);
-	(void) dcopy(SHDIAG, 2);
-	if ((flags & F_APPEND) != 0) {
-#ifdef O_APPEND
-	    fd = open(tmp, O_WRONLY | O_APPEND);
-#else /* !O_APPEND */
-	    fd = open(tmp, O_WRONLY);
-	    (void) lseek(fd, (off_t) 0, L_XTND);
-#endif /* O_APPEND */
-	}
-	else
-	    fd = 0;
-	if ((flags & F_APPEND) == 0 || fd == -1) {
-	    if (!(flags & F_OVERWRITE) && adrof(STRnoclobber)) {
-		if (flags & F_APPEND)
-		    stderror(ERR_SYSTEM, tmp, strerror(errno));
-		chkclob(tmp);
-	    }
-	    if ((fd = creat(tmp, 0666)) < 0)
-		stderror(ERR_SYSTEM, tmp, strerror(errno));
-#ifdef O_LARGEFILE
-	    /* allow input files larger than 2Gb  */
-	    (void) fcntl(fd, O_LARGEFILE, 0);
-#endif /* O_LARGEFILE */
-	}
-	(void) dmove(fd, 1);
-	is1atty = isatty(1);
-    }
-    else if (flags & F_PIPEOUT) {
-	(void) close(1);
-	(void) dup(pipeout[1]);
-	is1atty = 0;
-    }
-    else {
-	(void) close(1);
-	(void) dup(SHOUT);
-	is1atty = isoutatty;
-# if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
-	(void) close_on_exec(1, 0);
-# endif /* CLOSE_ON_EXEC && CLEX_DUPS */
-    }
-
-    (void) close(2);
-    if (flags & F_STDERR) {
-	(void) dup(1);
-	is2atty = is1atty;
-    }
-    else {
-	(void) dup(SHDIAG);
-	is2atty = isdiagatty;
-# if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
-	(void) close_on_exec(2, 0);
-# endif /* CLOSE_ON_EXEC && CLEX_DUPS */
-    }
-    didfds = 1;
-}
-
-void
-mypipe(pv)
-    register int *pv;
-{
-
-    if (pipe(pv) < 0)
-	goto oops;
-    pv[0] = dmove(pv[0], -1);
-    pv[1] = dmove(pv[1], -1);
-    if (pv[0] >= 0 && pv[1] >= 0)
-	return;
-oops:
-    stderror(ERR_PIPE);
-}
-
-static void
-chkclob(cp)
-    register char *cp;
-{
-    struct stat stb;
-
-    if (stat(cp, &stb) < 0)
-	return;
-    if (S_ISCHR(stb.st_mode))
-	return;
-    stderror(ERR_EXISTS, cp);
-}