On Fri, 22 Jun 2018 22:17:51 +0200 Zelphir Kaltstahl <zelphirkaltst...@gmail.com> wrote: [snip] > ... it returns 0 for end of file (what is the difference between this > and end of file object?
R6RS states that "The end-of-file object is returned by various I/O procedures when they reach end of file". It can be obtained by invoking the R6RS eof-object procedure and can be queried with the eof-object? predicate, so '(eof-object? (eof-object))' will evaluate to true. R6RS also says "The end-of-file object is not a datum value, and thus has no external representation". 0 is an integer. POSIX read() and recv() indicate end-of-file by unblocking and returning 0. Subsequent calls to read() or recv() might return -1 indicating an error, in which case recv! would throw an exception.
