public function geoip_open( $filename, $flags ) {
		$this->flags = $flags;
		if ( $this->flags & self::GEOIP_SHARED_MEMORY ) {
			$this->shmid = @shmop_open( self::GEOIP_SHM_KEY, 'a', 0, 0 );
		} else {
			if ( $this->filehandle = fopen( $filename, 'rb' ) ) {
				if ( $this->flags & self::GEOIP_MEMORY_CACHE ) {
					$s_array = fstat( $this->filehandle );
					$this->memory_buffer = fread( $this->filehandle, $s_array['size'] );
				}
			} else {
				$this->log( 'GeoIP API: Can not open ' . $filename, 'error' );
			}
		}

		$this->_setup_segments();
	}