Set the SO_KEEPALIVE option on your socket and let your OS do the hard work for you! 
use Socket qw(SOL_SOCKET SO_KEEPALIVE);
setsockopt($socket, SOL_SOCKET, SO_KEEPALIVE,  1);

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In reply to Re: IO::Select can_read/can_write timeout question by salva
in thread IO::Select can_read/can_write timeout question by avo

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