This module provides access to the select() and poll() functions
available in most operating systems, epoll() available on Linux 2.5+
and kqueue() available on most BSD. Note that on Windows, it only
works for sockets; on other operating systems, it also works for other
file types (in particular, on Unix, it works on pipes). It cannot be
used on regular files to determine whether a file has grown since it
was last read.
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select
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