Scieneer Common Lisp 1.3.9 online documentation

make-two-way-stream input-stream output-stream &key ibuf obuf[Function]

Returns a bidirectional stream which gets its input from input-stream and sends its output to output-stream. The input and output buffer sizes, ibuf and obuf, may be specified otherwise the buffer size will be zero if the respective input or output streams is not buffered else a default size is used.