Some more code:
socket (my $sock, PF_INET, SOCK_STREAM, getprotobyname('tcp')) || die 
+"socket: $!";
if(fcntl ($sock, F_SETFL, O_NONBLOCK)){
    my $iaddr = inet_aton(${$sock}->{host}) or return;
    my $paddr = sockaddr_in( ${$sock}->{port}, $iaddr ) or return;
    setsockopt($sock, SOL_SOCKET, SO_SNDTIMEO, pack("QQ", ${$sock}->{t
+imeout}, 0)) or die "setsockopt SOL_SOCKET, SO_SNDTIMEO: $!\n";
    setsockopt($sock, SOL_SOCKET, SO_RCVTIMEO, pack("QQ", ${$sock}->{t
+imeout}, 0)) or die "setsockopt SOL_SOCKET, SO_RCVTIMEO: $!\n";
    setsockopt($sock, 6, 18, pack("QQ", 5, 0)) or die "setsockopt SOL_
+TCP, TCP USER TIMEOUT: $!\n";

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In reply to Re^6: Timeout for an established connection by 0day
in thread Timeout for an established connection by 0day

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