I have given the Pseudo code to you.

Please try to apply poll or select on the socket file handle and do the stuff. It would be easy for you. I have not given the actcal code which I have.

NOTE: If you want to write anything on the client socket pass the client socket handle as I have passed in the pseudo code. otherwise no need to pass that.

#!/usr/bin/perl
use IO::Socket;
use Net::Ping;
$sock = new IO::Socket::INET (LocalHost => 'xxx.xxx.xxx.xxx', LocalPor
+t => 9321, Proto => 'tcp', Listen => 5, Reuse => 1 );
die "Socket could not be created. Reason: $!" unless $sock;
$reach = Net::Ping->new($ > ? "tcp": "icmp");
(defined $reach) or die "Couldn't create Net::Ping object: $!\n";

while (1) {
  do a poll or select on Server socket Id which is '$sock';
  whenever there is a new connection 'send_response'
  send_response ( $new_sock );
}

sub send_response {
    my ( $new_sock ) = shift;
    if $reach->ping("$host") {
        print "host is reachable"
    } else {
        print "host is unreachable";
    }

    return 1;
}
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