After reading perldoc -f select, I still can't get my head around the select function. especially this idom: 

($nfound,$timeleft) =
        select($rout=$rin, $wout=$win, $eout=$ein,$timeout);

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What is $rout=$rin, $wout=$win, $eout=$ein? and the return $nfound
Are they refering to default input, output, error output?
How select are used to manage multiple listening sockets?
I often see vec and fileno involved with select.

Anyone can exlain it in plain english to me, or maybe my english is not good engough to understand the perldoc :(

In reply to Perl select function mystery by macli

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