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:- use_module(library(unix)).(can be autoloaded)
dup2(), copying the underlying filedescriptor and thus making both streams point to the same underlying object. This is normally used together with fork/1 and pipe/2 to talk to an external program that is designed to communicate using standard I/O.
Both FromStream and ToStream either refer to a
Prolog stream or an integer descriptor number to refer directly to OS
descriptors. See also
demo/pipe.pl in the
source-distribution of this package.