mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
40b685b70d
Written by Hallvard B. Furuseth and placed into the public domain. This software is not subject to any license of the University of Oslo.
91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
/* fork.c - fork and exec a process, connecting stdin/out w/pipes */
|
|
/* $OpenLDAP$ */
|
|
/*
|
|
* Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
|
|
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
|
|
*/
|
|
|
|
#include "portable.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <ac/errno.h>
|
|
#include <ac/string.h>
|
|
#include <ac/socket.h>
|
|
#include <ac/unistd.h>
|
|
|
|
#include "slap.h"
|
|
#include "shell.h"
|
|
|
|
pid_t
|
|
forkandexec(
|
|
char **args,
|
|
FILE **rfp,
|
|
FILE **wfp
|
|
)
|
|
{
|
|
int p2c[2] = { -1, -1 }, c2p[2];
|
|
pid_t pid;
|
|
|
|
if ( pipe( p2c ) != 0 || pipe( c2p ) != 0 ) {
|
|
Debug( LDAP_DEBUG_ANY, "pipe failed\n", 0, 0, 0 );
|
|
close( p2c[0] );
|
|
close( p2c[1] );
|
|
return( -1 );
|
|
}
|
|
|
|
/*
|
|
* what we're trying to set up looks like this:
|
|
* parent *wfp -> p2c[1] | p2c[0] -> stdin child
|
|
* parent *rfp <- c2p[0] | c2p[1] <- stdout child
|
|
*/
|
|
|
|
fflush( NULL );
|
|
# ifdef HAVE_THR
|
|
pid = fork1();
|
|
# else
|
|
pid = fork();
|
|
# endif
|
|
if ( pid == 0 ) { /* child */
|
|
/*
|
|
* child could deadlock here due to resources locked
|
|
* by our parent
|
|
*
|
|
* If so, configure --without-threads.
|
|
*/
|
|
if ( dup2( p2c[0], 0 ) == -1 || dup2( c2p[1], 1 ) == -1 ) {
|
|
Debug( LDAP_DEBUG_ANY, "dup2 failed\n", 0, 0, 0 );
|
|
exit( EXIT_FAILURE );
|
|
}
|
|
}
|
|
close( p2c[0] );
|
|
close( c2p[1] );
|
|
if ( pid <= 0 ) {
|
|
close( p2c[1] );
|
|
close( c2p[0] );
|
|
}
|
|
switch ( pid ) {
|
|
case 0:
|
|
execv( args[0], args );
|
|
|
|
Debug( LDAP_DEBUG_ANY, "execv failed\n", 0, 0, 0 );
|
|
exit( EXIT_FAILURE );
|
|
|
|
case -1: /* trouble */
|
|
Debug( LDAP_DEBUG_ANY, "fork failed\n", 0, 0, 0 );
|
|
return( -1 );
|
|
}
|
|
|
|
/* parent */
|
|
if ( (*rfp = fdopen( c2p[0], "r" )) == NULL || (*wfp = fdopen( p2c[1],
|
|
"w" )) == NULL ) {
|
|
Debug( LDAP_DEBUG_ANY, "fdopen failed\n", 0, 0, 0 );
|
|
close( c2p[0] );
|
|
close( p2c[1] );
|
|
|
|
return( -1 );
|
|
}
|
|
|
|
return( pid );
|
|
}
|