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119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
/* fork.c - fork and exec a process, connecting stdin/out w/pipes */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2020 The OpenLDAP Foundation.
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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 only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Portions Copyright (c) 1995 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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/* ACKNOWLEDGEMENTS:
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* This work was originally developed by the University of Michigan
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* (as part of U-MICH LDAP).
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/errno.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#include <ac/unistd.h>
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#include "slap.h"
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#include "shell.h"
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pid_t
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forkandexec(
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char **args,
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FILE **rfp,
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FILE **wfp
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)
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{
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int p2c[2] = { -1, -1 }, c2p[2];
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pid_t pid;
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if ( pipe( p2c ) != 0 || pipe( c2p ) != 0 ) {
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Debug( LDAP_DEBUG_ANY, "pipe failed\n" );
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close( p2c[0] );
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close( p2c[1] );
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return( -1 );
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}
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/*
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* what we're trying to set up looks like this:
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* parent *wfp -> p2c[1] | p2c[0] -> stdin child
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* parent *rfp <- c2p[0] | c2p[1] <- stdout child
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*/
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fflush( NULL );
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# ifdef HAVE_THR
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pid = fork1();
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# else
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pid = fork();
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# endif
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if ( pid == 0 ) { /* child */
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/*
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* child could deadlock here due to resources locked
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* by our parent
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*
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* If so, configure --without-threads.
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*/
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if ( dup2( p2c[0], 0 ) == -1 || dup2( c2p[1], 1 ) == -1 ) {
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Debug( LDAP_DEBUG_ANY, "dup2 failed\n" );
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exit( EXIT_FAILURE );
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}
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}
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close( p2c[0] );
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close( c2p[1] );
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if ( pid <= 0 ) {
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close( p2c[1] );
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close( c2p[0] );
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}
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switch ( pid ) {
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case 0:
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execv( args[0], args );
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Debug( LDAP_DEBUG_ANY, "execv failed\n" );
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exit( EXIT_FAILURE );
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case -1: /* trouble */
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Debug( LDAP_DEBUG_ANY, "fork failed\n" );
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return( -1 );
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}
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/* parent */
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if ( (*rfp = fdopen( c2p[0], "r" )) == NULL || (*wfp = fdopen( p2c[1],
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"w" )) == NULL ) {
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Debug( LDAP_DEBUG_ANY, "fdopen failed\n" );
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if ( *rfp ) {
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fclose( *rfp );
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*rfp = NULL;
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} else {
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close( c2p[0] );
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}
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close( p2c[1] );
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return( -1 );
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}
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return( pid );
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}
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