From 3cd10f5ab6cda5c4a8db829dd38f25168edcfc4a Mon Sep 17 00:00:00 2001
From: Diego Nehab
The function returns a table with the sockets ready for -reading, a table with the sockets ready for writing and an error message. +
The function returns a list with the sockets ready for +reading, a list with the sockets ready for writing and an error message. The error message is "timeout" if a timeout condition was met and -nil otherwise. The returned tables are associative, to -simplify the test if a specific socket has changed status. +nil otherwise. The returned tables are +doubly keyed both by integers and also by the sockets +themselves, to simplify the test if a specific socket has +changed status.
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