Determines whether a stream is at end of file.
stream-check-eof-no-hang stream => result
An input stream.
The generic function
stream-check-eof-no-hang determines if the data source of the stream is at end of file, without hanging.
stream should be an instance of a subclass of buffered-stream.
:eof if stream is at end of file and
There is a built-in method specialized on buffered-stream which returns
:eof in all cases.
LispWorks User Guide and Reference Manual - 20 Sep 2017