/* $OpenLDAP: pkg/ldap/libraries/liblutil/sockpair.c,v 1.17.2.5 2010/04/13 20:23:07 kurt Exp $ */ /* This work is part of OpenLDAP Software <http://www.openldap.org/>. * * Copyright 1998-2010 The OpenLDAP Foundation. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted only as authorized by the OpenLDAP * Public License. * * A copy of this license is available in the file LICENSE in the * top-level directory of the distribution or, alternatively, at * <http://www.OpenLDAP.org/license.html>. */ #include "portable.h" #include <ac/socket.h> #include <ac/unistd.h> #include <lutil.h> /* Return a pair of socket descriptors that are connected to each other. * The returned descriptors are suitable for use with select(). The two * descriptors may or may not be identical; the function may return * the same descriptor number in both slots. It is guaranteed that * data written on sds[1] will be readable on sds[0]. The returned * descriptors may be datagram oriented, so data should be written * in reasonably small pieces and read all at once. On Unix systems * this function is best implemented using a single pipe() call. */ int lutil_pair( ber_socket_t sds[2] ) { #ifdef USE_PIPE return pipe( sds ); #else struct sockaddr_in si; int rc; ber_socklen_t len = sizeof(si); ber_socket_t sd; sd = socket( AF_INET, SOCK_DGRAM, 0 ); if ( sd == AC_SOCKET_INVALID ) { return sd; } (void) memset( (void*) &si, '\0', len ); si.sin_family = AF_INET; si.sin_port = 0; si.sin_addr.s_addr = htonl( INADDR_LOOPBACK ); rc = bind( sd, (struct sockaddr *)&si, len ); if ( rc == AC_SOCKET_ERROR ) { tcp_close(sd); return rc; } rc = getsockname( sd, (struct sockaddr *)&si, &len ); if ( rc == AC_SOCKET_ERROR ) { tcp_close(sd); return rc; } rc = connect( sd, (struct sockaddr *)&si, len ); if ( rc == AC_SOCKET_ERROR ) { tcp_close(sd); return rc; } sds[0] = sd; #if !HAVE_WINSOCK sds[1] = dup( sds[0] ); #else sds[1] = sds[0]; #endif return 0; #endif }