SWI-Prolog -- tcp

Availability::- use_module(library(socket)).(can be autoloaded)

[det]tcp_fcntl(+Stream, +Action, ?Argument)

Interface to the fcntl() call. Currently only suitable to deal switch stream to non-blocking mode using:

  tcp_fcntl(Stream, setfl, nonblock),

An attempt to read from a non-blocking stream while there is no data available returns -1 (or end_of_file for read/1), but at_end_of_stream/1 fails. On actual end-of-input, at_end_of_stream/1 succeeds.