Return the pathname associated with the stream. The stream pathname is implemented for streams of class file-stream, and for composite streams that may encapsulate file streams. When appropriate, user defined composite streams should provide a method to return the stream-pathname of the source or target stream. A default method is provided for the class stream that returns nil.

Set the pathname associated with the stream. The stream pathname is implemented for streams of class file-stream, and for composite streams that may encapsulate file streams. When appropriate, user defined composite streams should provide a method to set the stream-pathname of the source or target stream. A default method is provided for the class stream that does nothing.