(make-instance 'everblocking-stream:everblocking-stream)
The created stream returns NIL on calls to CL:LISTEN, CL:READ-CHAR-NO-HANG
and CL:CLEAR-INPUT, and blocks on CL:READ-CHAR, CL:READ-LINE and
CL:PEEK-CHAR.
Usage: mocking streams belonging to inactive network sockets for testing purposes.
Public domain.