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996 lines
25 KiB
C
996 lines
25 KiB
C
/*
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* sh.sem.c: I/O redirections and job forking. A touchy issue!
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* Most stuff with builtins is incorrect
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*/
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/*-
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* Copyright (c) 1980, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "sh.h"
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#include "tc.h"
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#include "tw.h"
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#ifdef WINNT_NATIVE
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#include "nt.const.h"
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#endif /*WINNT_NATIVE*/
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#ifdef CLOSE_ON_EXEC
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# ifndef SUNOS4
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# ifndef CLEX_DUPS
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# define CLEX_DUPS
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# endif /* CLEX_DUPS */
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# endif /* !SUNOS4 */
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#endif /* CLOSE_ON_EXEC */
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#if defined(__sparc__) || defined(sparc)
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# if !defined(MACH) && SYSVREL == 0 && !defined(Lynx) && !defined(BSD4_4) && !defined(__linux__) && !defined(__GNU__) && !defined(__GLIBC__)
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# include <vfork.h>
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# endif /* !MACH && SYSVREL == 0 && !Lynx && !BSD4_4 && !glibc */
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#endif /* __sparc__ || sparc */
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#ifdef VFORK
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static void vffree (int);
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#endif
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static Char *splicepipe (struct command *, Char *);
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static void doio (struct command *, int *, int *);
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static void chkclob (const char *);
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/*
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* C shell
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*/
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/*
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* For SVR4, there are problems with pipelines having the first process as
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* the group leader. The problem occurs when the first process exits before
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* the others have a chance to setpgid(). This is because in SVR4 you can't
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* have a zombie as a group leader. The solution I have used is to reverse
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* the order in which pipelines are started, making the last process the
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* group leader. (Note I am not using 'pipeline' in the generic sense -- I
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* mean processes connected by '|'.) I don't know yet if this causes other
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* problems.
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*
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* All the changes for this are in execute(), and are enclosed in
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* '#ifdef BACKPIPE'
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*
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* David Dawes (dawes@physics.su.oz.au) Oct 1991
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*/
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/*VARARGS 1*/
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void
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execute(struct command *t, volatile int wanttty, int *pipein, int *pipeout,
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int do_glob)
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{
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int forked = 0;
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const struct biltins * volatile bifunc;
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pid_t pid = 0;
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int pv[2];
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sigset_t set;
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static sigset_t csigset;
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#ifdef VFORK
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static int onosigchld = 0;
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#endif /* VFORK */
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static int nosigchld = 0;
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(void) &wanttty;
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(void) &forked;
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(void) &bifunc;
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if (t == 0)
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return;
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#ifdef WINNT_NATIVE
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{
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if ((varval(STRNTslowexec) == STRNULL) &&
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!t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds &&
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(intty || intact) && (t->t_dtyp == NODE_COMMAND) &&
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!isbfunc(t)) {
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if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
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(void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
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Dfix(t);
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if (nt_try_fast_exec(t) == 0)
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return;
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}
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}
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#endif /* WINNT_NATIVE */
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/*
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* Ed hutchins@sgi.com & Dominic dbg@sgi.com
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* Sat Feb 25 03:13:11 PST 1995
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* try implicit cd if we have a 1 word command
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*/
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if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] &&
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t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) {
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Char *sCName;
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struct stat stbuf;
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char *pathname;
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sCName = dollar(t->t_dcom[0]);
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if (sCName != NULL && sCName[0] == '~') {
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struct Strbuf buf = Strbuf_INIT;
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const Char *name_end;
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for (name_end = sCName + 1; *name_end != '\0' && *name_end != '/';
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name_end++)
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continue;
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if (name_end != sCName + 1) {
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Char *name, *home;
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name = Strnsave(sCName + 1, name_end - (sCName + 1));
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home = gethdir(name);
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if (home != NULL) {
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Strbuf_append(&buf, home);
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xfree(home);
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} else
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Strbuf_append(&buf, name);
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xfree(name);
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} else
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Strbuf_append(&buf, varval(STRhome));
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Strbuf_append(&buf, name_end);
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xfree(sCName);
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sCName = Strbuf_finish(&buf);
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}
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pathname = short2str(sCName);
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xfree(sCName);
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/* if this is a dir, tack a "cd" on as the first arg */
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if (pathname != NULL &&
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((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode))
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#ifdef WINNT_NATIVE
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|| (pathname[0] && pathname[1] == ':' && pathname[2] == '\0')
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#endif /* WINNT_NATIVE */
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)) {
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Char *vCD[2];
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Char **ot_dcom = t->t_dcom;
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vCD[0] = Strsave(STRcd);
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vCD[1] = NULL;
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t->t_dcom = blkspl(vCD, ot_dcom);
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xfree(ot_dcom);
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if (implicit_cd > 1) {
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blkpr(t->t_dcom);
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xputchar( '\n' );
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}
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}
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}
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/*
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* From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
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* Don't check for wantty > 0...
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*/
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if (t->t_dflg & F_AMPERSAND)
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wanttty = 0;
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switch (t->t_dtyp) {
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case NODE_COMMAND:
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if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
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memmove(t->t_dcom[0], t->t_dcom[0] + 1,
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(Strlen(t->t_dcom[0] + 1) + 1) * sizeof (*t->t_dcom[0]));
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if ((t->t_dflg & F_REPEAT) == 0)
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Dfix(t); /* $ " ' \ */
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if (t->t_dcom[0] == 0) {
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return;
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}
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/*FALLTHROUGH*/
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case NODE_PAREN:
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#ifdef BACKPIPE
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if (t->t_dflg & F_PIPEIN)
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mypipe(pipein);
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#else /* !BACKPIPE */
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if (t->t_dflg & F_PIPEOUT)
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mypipe(pipeout);
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#endif /* BACKPIPE */
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/*
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* Must do << early so parent will know where input pointer should be.
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* If noexec then this is all we do.
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*/
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if (t->t_dflg & F_READ) {
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int old_pintr_disabled;
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xclose(0);
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if (setintr)
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pintr_push_enable(&old_pintr_disabled);
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heredoc(t->t_dlef);
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if (setintr)
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cleanup_until(&old_pintr_disabled);
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if (noexec)
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xclose(0);
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}
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setcopy(STRstatus, STR0, VAR_READWRITE);
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/*
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* This mess is the necessary kludge to handle the prefix builtins:
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* nice, nohup, time. These commands can also be used by themselves,
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* and this is not handled here. This will also work when loops are
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* parsed.
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*/
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while (t->t_dtyp == NODE_COMMAND)
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if (eq(t->t_dcom[0], STRnice)) {
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if (t->t_dcom[1]) {
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if (strchr("+-", t->t_dcom[1][0])) {
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if (t->t_dcom[2]) {
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setname("nice");
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t->t_nice = (unsigned char)getn(t->t_dcom[1]);
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lshift(t->t_dcom, 2);
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t->t_dflg |= F_NICE;
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}
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else
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break;
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}
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else {
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t->t_nice = 4;
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lshift(t->t_dcom, 1);
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t->t_dflg |= F_NICE;
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}
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}
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else
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break;
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}
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else if (eq(t->t_dcom[0], STRnohup)) {
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if (t->t_dcom[1]) {
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t->t_dflg |= F_NOHUP;
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lshift(t->t_dcom, 1);
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}
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else
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break;
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}
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else if (eq(t->t_dcom[0], STRhup)) {
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if (t->t_dcom[1]) {
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t->t_dflg |= F_HUP;
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lshift(t->t_dcom, 1);
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}
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else
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break;
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}
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else if (eq(t->t_dcom[0], STRtime)) {
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if (t->t_dcom[1]) {
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t->t_dflg |= F_TIME;
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lshift(t->t_dcom, 1);
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}
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else
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break;
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}
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#ifdef F_VER
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else if (eq(t->t_dcom[0], STRver))
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if (t->t_dcom[1] && t->t_dcom[2]) {
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setname("ver");
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t->t_systype = getv(t->t_dcom[1]);
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lshift(t->t_dcom, 2);
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t->t_dflg |= F_VER;
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}
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else
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break;
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#endif /* F_VER */
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else
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break;
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/* is it a command */
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if (t->t_dtyp == NODE_COMMAND) {
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/*
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* Check if we have a builtin function and remember which one.
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*/
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bifunc = isbfunc(t);
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if (noexec) {
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/*
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* Continue for builtins that are part of the scripting language
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*/
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if (bifunc == NULL)
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break;
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if (bifunc->bfunct != (bfunc_t)dobreak &&
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bifunc->bfunct != (bfunc_t)docontin &&
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bifunc->bfunct != (bfunc_t)doelse &&
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bifunc->bfunct != (bfunc_t)doend &&
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bifunc->bfunct != (bfunc_t)doforeach&&
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bifunc->bfunct != (bfunc_t)dogoto &&
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bifunc->bfunct != (bfunc_t)doif &&
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bifunc->bfunct != (bfunc_t)dorepeat &&
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bifunc->bfunct != (bfunc_t)doswbrk &&
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bifunc->bfunct != (bfunc_t)doswitch &&
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bifunc->bfunct != (bfunc_t)dowhile &&
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bifunc->bfunct != (bfunc_t)dozip)
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break;
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}
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}
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else { /* not a command */
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bifunc = NULL;
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if (noexec)
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break;
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}
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/*
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* GrP Executing a command - run jobcmd hook
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* Don't run for builtins
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* Don't run if we're not in a tty
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* Don't run if we're not really executing
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*/
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/*
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* CR - Charles Ross Aug 2005
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* added "isoutatty".
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* The new behavior is that the jobcmd won't be executed
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* if stdout (SHOUT) isnt attached to a tty.. IE when
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* redirecting, or using backquotes etc..
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*/
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if (t->t_dtyp == NODE_COMMAND && !bifunc && !noexec && intty && isoutatty) {
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Char *cmd = unparse(t);
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cleanup_push(cmd, xfree);
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job_cmd(cmd);
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cleanup_until(cmd);
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}
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/*
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* We fork only if we are timed, or are not the end of a parenthesized
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* list and not a simple builtin function. Simple meaning one that is
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* not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
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* fork in some of these cases.
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*/
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#ifdef BACKPIPE
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/*
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* Can't have NOFORK for the tail of a pipe - because it is not the
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* last command spawned (even if it is at the end of a parenthesised
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* list).
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*/
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if (t->t_dflg & F_PIPEIN)
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t->t_dflg &= ~(F_NOFORK);
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#else
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/*
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* "command | builtin" may cause major misbehaviour as noted in
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* in the BUGS file entry
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* Subject: Redirected input to built-in functions misbehaves badly
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* forking when the builtin is the end of the pipe corrects the
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* problem.
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*/
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if (bifunc && (t->t_dflg & F_PIPEIN))
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t->t_dflg &= ~(F_NOFORK);
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#endif /* BACKPIPE */
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/*
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* Prevent forking cd, pushd, popd, chdir cause this will cause the
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* shell not to change dir! (XXX: but only for nice?)
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*/
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if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd ||
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bifunc->bfunct == (bfunc_t)dopushd ||
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bifunc->bfunct == (bfunc_t)dopopd))
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t->t_dflg &= ~(F_NICE);
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if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
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(!bifunc || t->t_dflg &
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(F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) ||
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/*
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* We have to fork for eval too.
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*/
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(bifunc && (t->t_dflg & F_PIPEIN) != 0 &&
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bifunc->bfunct == (bfunc_t)doeval)) {
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#ifdef VFORK
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if (t->t_dtyp == NODE_PAREN ||
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t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc)
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#endif /* VFORK */
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{
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forked++;
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/*
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* We need to block SIGCHLD here, so that if the process does
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* not die before we can set the process group
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*/
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if (wanttty >= 0 && !nosigchld) {
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sigemptyset(&set);
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sigaddset(&set, SIGCHLD);
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(void)sigprocmask(SIG_BLOCK, &set, &csigset);
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nosigchld = 1;
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}
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pid = pfork(t, wanttty);
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if (pid == 0 && nosigchld) {
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sigprocmask(SIG_SETMASK, &csigset, NULL);
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nosigchld = 0;
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}
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else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
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backpid = pid;
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}
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#ifdef VFORK
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else {
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int ochild, osetintr, ohaderr, odidfds;
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int oSHIN, oSHOUT, oSHDIAG, oOLDSTD, otpgrp;
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int oisoutatty, oisdiagatty;
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sigset_t oset, ocsigset;
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# ifndef CLOSE_ON_EXEC
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int odidcch;
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# endif /* !CLOSE_ON_EXEC */
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/*
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* Prepare for the vfork by saving everything that the child
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* corrupts before it exec's. Note that in some signal
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* implementations which keep the signal info in user space
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* (e.g. Sun's) it will also be necessary to save and restore
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* the current sigvec's for the signals the child touches
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* before it exec's.
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*/
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/*
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* Sooooo true... If this is a Sun, save the sigvec's. (Skip
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* Gilbrech - 11/22/87)
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*/
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# ifdef SAVESIGVEC
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struct sigaction savesv[NSIGSAVED];
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sigset_t savesm;
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# endif /* SAVESIGVEC */
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if (wanttty >= 0 && !nosigchld && !noexec) {
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sigemptyset(&set);
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sigaddset(&set, SIGCHLD);
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(void)sigprocmask(SIG_BLOCK, &set, &csigset);
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nosigchld = 1;
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}
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sigemptyset(&set);
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sigaddset(&set, SIGCHLD);
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sigaddset(&set, SIGINT);
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(void)sigprocmask(SIG_BLOCK, &set, &oset);
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ochild = child;
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osetintr = setintr;
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ohaderr = haderr;
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odidfds = didfds;
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# ifndef CLOSE_ON_EXEC
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odidcch = didcch;
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# endif /* !CLOSE_ON_EXEC */
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oSHIN = SHIN;
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oSHOUT = SHOUT;
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oSHDIAG = SHDIAG;
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oOLDSTD = OLDSTD;
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otpgrp = tpgrp;
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oisoutatty = isoutatty;
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oisdiagatty = isdiagatty;
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ocsigset = csigset;
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onosigchld = nosigchld;
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Vsav = Vdp = 0;
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Vexpath = 0;
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Vt = 0;
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# ifdef SAVESIGVEC
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savesigvec(savesv, savesm);
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# endif /* SAVESIGVEC */
|
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if (use_fork)
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|
pid = fork();
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else
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|
pid = vfork();
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|
|
if (pid < 0) {
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# ifdef SAVESIGVEC
|
|
restoresigvec(savesv, savesm);
|
|
# endif /* SAVESIGVEC */
|
|
sigprocmask(SIG_SETMASK, &oset, NULL);
|
|
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;
|
|
csigset = ocsigset;
|
|
nosigchld = onosigchld;
|
|
|
|
xfree(Vsav);
|
|
Vsav = 0;
|
|
xfree(Vdp);
|
|
Vdp = 0;
|
|
xfree(Vexpath);
|
|
Vexpath = 0;
|
|
blk_cleanup(Vt);
|
|
Vt = 0;
|
|
/* this is from pfork() */
|
|
palloc(pid, t);
|
|
sigprocmask(SIG_SETMASK, &oset, NULL);
|
|
}
|
|
else { /* child */
|
|
/* this is from pfork() */
|
|
pid_t pgrp;
|
|
int ignint = 0;
|
|
if (nosigchld) {
|
|
sigprocmask(SIG_SETMASK, &csigset, NULL);
|
|
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 */
|
|
|
|
sigaction(SIGTERM, &parterm, NULL);
|
|
}
|
|
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);
|
|
# if defined(HAVE_SETPRIORITY) && defined(PRIO_PROCESS)
|
|
if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
|
|
stderror(ERR_SYSTEM, "setpriority",
|
|
strerror(errno));
|
|
# else /* !HAVE_SETPRIORITY || !PRIO_PROCESS */
|
|
(void) nice(nval);
|
|
# endif /* HAVE_SETPRIORITY && PRIO_PROCESS */
|
|
}
|
|
# 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) {
|
|
xclose(pipeout[0]);
|
|
xclose(pipeout[1]);
|
|
}
|
|
if ((t->t_dflg & F_PIPEIN) != 0)
|
|
break;
|
|
#else /* !BACKPIPE */
|
|
if (didfds == 0 && t->t_dflg & F_PIPEIN) {
|
|
xclose(pipein[0]);
|
|
xclose(pipein[1]);
|
|
}
|
|
if ((t->t_dflg & F_PIPEOUT) != 0)
|
|
break;
|
|
#endif /* BACKPIPE */
|
|
|
|
if (nosigchld) {
|
|
sigprocmask(SIG_SETMASK, &csigset, NULL);
|
|
nosigchld = 0;
|
|
}
|
|
if ((t->t_dflg & F_AMPERSAND) == 0)
|
|
pwait();
|
|
break;
|
|
}
|
|
|
|
doio(t, pipein, pipeout);
|
|
#ifdef BACKPIPE
|
|
if (t->t_dflg & F_PIPEIN) {
|
|
xclose(pipein[0]);
|
|
xclose(pipein[1]);
|
|
}
|
|
#else /* !BACKPIPE */
|
|
if (t->t_dflg & F_PIPEOUT) {
|
|
xclose(pipeout[0]);
|
|
xclose(pipeout[1]);
|
|
}
|
|
#endif /* BACKPIPE */
|
|
/*
|
|
* Perform a builtin function. If we are not forked, arrange for
|
|
* possible stopping
|
|
*/
|
|
if (bifunc) {
|
|
if (forked) {
|
|
func(t, bifunc);
|
|
exitstat();
|
|
} else {
|
|
jmp_buf_t oldexit;
|
|
int ohaderr = haderr;
|
|
|
|
getexit(oldexit);
|
|
if (setexit() == 0)
|
|
func(t, bifunc);
|
|
resexit(oldexit);
|
|
haderr = ohaderr;
|
|
|
|
if (adrof(STRprintexitvalue)) {
|
|
int rv = getn(varval(STRstatus));
|
|
if (rv != 0)
|
|
xprintf(CGETS(17, 2, "Exit %d\n"), rv);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
if (t->t_dtyp != NODE_PAREN) {
|
|
doexec(t, do_glob);
|
|
/* NOTREACHED */
|
|
}
|
|
/*
|
|
* For () commands must put new 0,1,2 in FSH* and recurse
|
|
*/
|
|
if ((OLDSTD = dcopy(0, FOLDSTD)) >= 0)
|
|
(void)close_on_exec(OLDSTD, 1);
|
|
if ((SHOUT = dcopy(1, FSHOUT)) >= 0) {
|
|
(void)close_on_exec(SHOUT, 1);
|
|
isoutatty = isatty(SHOUT);
|
|
}
|
|
if ((SHDIAG = dcopy(2, FSHDIAG)) >= 0) {
|
|
(void)close_on_exec(SHDIAG, 1);
|
|
isdiagatty = isatty(SHDIAG);
|
|
}
|
|
xclose(SHIN);
|
|
SHIN = -1;
|
|
#ifndef CLOSE_ON_EXEC
|
|
didcch = 0;
|
|
#else
|
|
(void) close_on_exec(FSHOUT, 1);
|
|
(void) close_on_exec(FSHDIAG, 1);
|
|
(void) close_on_exec(FOLDSTD, 1);
|
|
#endif /* !CLOSE_ON_EXEC */
|
|
didfds = 0;
|
|
wanttty = -1;
|
|
t->t_dspr->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
|
|
execute(t->t_dspr, wanttty, NULL, NULL, do_glob);
|
|
exitstat();
|
|
|
|
case NODE_PIPE:
|
|
#ifdef BACKPIPE
|
|
t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
|
|
(F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
|
|
execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
|
|
t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
|
|
(F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
|
|
execute(t->t_dcar, wanttty, pipein, pv, do_glob);
|
|
#else /* !BACKPIPE */
|
|
t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
|
|
(F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
|
|
execute(t->t_dcar, wanttty, pipein, pv, do_glob);
|
|
t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
|
|
(F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
|
|
execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
|
|
#endif /* BACKPIPE */
|
|
break;
|
|
|
|
case NODE_LIST:
|
|
if (t->t_dcar) {
|
|
t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
|
|
execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
|
|
/*
|
|
* 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 | F_BACKQ);
|
|
execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
|
|
}
|
|
break;
|
|
|
|
case NODE_OR:
|
|
case NODE_AND:
|
|
if (t->t_dcar) {
|
|
t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
|
|
execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
|
|
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 | F_BACKQ);
|
|
execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
|
|
}
|
|
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 void
|
|
/*ARGSUSED*/
|
|
vffree(int snum)
|
|
{
|
|
USE(snum);
|
|
|
|
_exit(1);
|
|
}
|
|
#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(struct command *t, Char *cp)
|
|
{
|
|
Char *blk[2];
|
|
|
|
if (adrof(STRnoambiguous)) {
|
|
Char **pv;
|
|
int gflag;
|
|
|
|
blk[0] = Dfix1(cp); /* expand $ */
|
|
blk[1] = NULL;
|
|
|
|
gflag = tglob(blk);
|
|
if (gflag) {
|
|
pv = globall(blk, gflag);
|
|
if (pv == NULL) {
|
|
setname(short2str(blk[0]));
|
|
xfree(blk[0]);
|
|
stderror(ERR_NAME | ERR_NOMATCH);
|
|
}
|
|
if (pv[1] != NULL) { /* we need to fix the command vector */
|
|
Char **av = blkspl(t->t_dcom, &pv[1]);
|
|
xfree(t->t_dcom);
|
|
t->t_dcom = av;
|
|
}
|
|
xfree(blk[0]);
|
|
blk[0] = pv[0];
|
|
xfree(pv);
|
|
}
|
|
}
|
|
else {
|
|
Char *buf;
|
|
|
|
buf = Dfix1(cp);
|
|
cleanup_push(buf, xfree);
|
|
blk[0] = globone(buf, G_ERROR);
|
|
cleanup_until(buf);
|
|
}
|
|
return(blk[0]);
|
|
}
|
|
|
|
/*
|
|
* Perform io redirection.
|
|
* We may or maynot be forked here.
|
|
*/
|
|
static void
|
|
doio(struct command *t, int *pipein, int *pipeout)
|
|
{
|
|
int fd;
|
|
Char *cp;
|
|
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;
|
|
|
|
/*
|
|
* 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);
|
|
tmp = strsave(short2str(cp));
|
|
xfree(cp);
|
|
cleanup_push(tmp, xfree);
|
|
if ((fd = xopen(tmp, O_RDONLY|O_LARGEFILE)) < 0)
|
|
stderror(ERR_SYSTEM, tmp, strerror(errno));
|
|
cleanup_until(tmp);
|
|
/* allow input files larger than 2Gb */
|
|
#ifndef WINNT_NATIVE
|
|
(void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
|
|
#endif /*!WINNT_NATIVE*/
|
|
(void) dmove(fd, 0);
|
|
}
|
|
else if (flags & F_PIPEIN) {
|
|
xclose(0);
|
|
TCSH_IGNORE(dup(pipein[0]));
|
|
xclose(pipein[0]);
|
|
xclose(pipein[1]);
|
|
}
|
|
else if ((flags & F_NOINTERRUPT) && tpgrp == -1) {
|
|
xclose(0);
|
|
(void) xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
|
|
}
|
|
else {
|
|
xclose(0);
|
|
TCSH_IGNORE(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;
|
|
|
|
cp = splicepipe(t, t->t_drit);
|
|
tmp = strsave(short2str(cp));
|
|
xfree(cp);
|
|
cleanup_push(tmp, xfree);
|
|
/*
|
|
* so > /dev/std{out,err} work
|
|
*/
|
|
(void) dcopy(SHOUT, 1);
|
|
(void) dcopy(SHDIAG, 2);
|
|
if ((flags & F_APPEND) != 0) {
|
|
#ifdef O_APPEND
|
|
fd = xopen(tmp, O_WRONLY|O_APPEND|O_LARGEFILE);
|
|
#else /* !O_APPEND */
|
|
fd = xopen(tmp, O_WRONLY|O_LARGEFILE);
|
|
(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) && no_clobber) {
|
|
if (flags & F_APPEND)
|
|
stderror(ERR_SYSTEM, tmp, strerror(errno));
|
|
chkclob(tmp);
|
|
}
|
|
if ((fd = xcreat(tmp, 0666)) < 0)
|
|
stderror(ERR_SYSTEM, tmp, strerror(errno));
|
|
/* allow input files larger than 2Gb */
|
|
#ifndef WINNT_NATIVE
|
|
(void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
|
|
#endif /*!WINNT_NATIVE*/
|
|
}
|
|
cleanup_until(tmp);
|
|
(void) dmove(fd, 1);
|
|
is1atty = isatty(1);
|
|
}
|
|
else if (flags & F_PIPEOUT) {
|
|
xclose(1);
|
|
TCSH_IGNORE(dup(pipeout[1]));
|
|
is1atty = 0;
|
|
}
|
|
else {
|
|
xclose(1);
|
|
TCSH_IGNORE(dup(SHOUT));
|
|
is1atty = isoutatty;
|
|
# if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
|
|
(void) close_on_exec(1, 0);
|
|
# endif /* CLOSE_ON_EXEC && CLEX_DUPS */
|
|
}
|
|
|
|
xclose(2);
|
|
if (flags & F_STDERR) {
|
|
TCSH_IGNORE(dup(1));
|
|
is2atty = is1atty;
|
|
}
|
|
else {
|
|
TCSH_IGNORE(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(int *pv)
|
|
{
|
|
|
|
if (pipe(pv) < 0)
|
|
goto oops;
|
|
(void)close_on_exec(pv[0] = dmove(pv[0], -1), 1);
|
|
(void)close_on_exec(pv[1] = dmove(pv[1], -1), 1);
|
|
if (pv[0] >= 0 && pv[1] >= 0)
|
|
return;
|
|
if (pv[0] >= 0)
|
|
xclose(pv[0]);
|
|
if (pv[1] >= 0)
|
|
xclose(pv[1]);
|
|
oops:
|
|
stderror(ERR_PIPE);
|
|
}
|
|
|
|
static void
|
|
chkclob(const char *cp)
|
|
{
|
|
struct stat stb;
|
|
|
|
if (stat(cp, &stb) < 0)
|
|
return;
|
|
if (S_ISCHR(stb.st_mode))
|
|
return;
|
|
if (no_clobber & NOCLOBBER_NOTEMPTY && stb.st_size == 0)
|
|
return;
|
|
if (no_clobber & NOCLOBBER_ASK) {
|
|
if (getYN(CGETS(22, 15,
|
|
"Do you really want to overwrite an existing file? [N/y] ")))
|
|
return;
|
|
}
|
|
|
|
stderror(ERR_EXISTS, cp);
|
|
}
|