#server
use strict;
use warnings;

use IO::Socket; 

$| = 1;
my $nonblocking = 1;

		 
my $sock = new IO::Socket::INET( 
    LocalHost   => "localhost", 
    LocalPort   => 7890, 
    Proto       => "tcp", 
    Listen      => SOMAXCONN, 
    Reuse       => 1,
    Timeout     => 20,
); 

if ($sock) {
   print "A socket created on LocalHost listening on LocalPort\n";
} else {
   die "Error - no listening socket created : $!"; 
}
my $flush = 1;

while (my ($new_sock,$c_addr) = $sock->accept()) {
    my ($client_port, $c_ip) = sockaddr_in($c_addr); 
    my $client_ipnum = inet_ntoa($c_ip); 
    my $client_host =gethostbyaddr($c_ip, AF_INET); 
    print "Got a connection from: $client_host"," [$client_ipnum] \n"; 
    print "Created new socket for reading or writing data to Client\n";

    ioctl($new_sock, 0x8004667e, \$nonblocking);
    my $buf;
    
    sysread($new_sock, $buf, 10);
    print "$buf\n";
    syswrite($new_sock, $buf, 10);
    $new_sock->flush;
    sysread($new_sock, $buf, 1);
    print "$buf\n";
    $new_sock->flush;
    syswrite($new_sock, "12", 2);
}


##</code><code>##

#client
use strict;
use warnings;

use IO::Socket; 

#To flush the buffer print statements
$| = 1;  

my $sock = new IO::Socket::INET( PeerAddr => 'localhost', PeerPort => 7890, Proto => 'tcp'); 

if ($sock) {
   print "A tcp socket on localhost connected to 7890\n";
} 
else {
   die "Error: $!"; 
}

my $nonblocking = 1;
ioctl($sock, 0x8004667e, \$nonblocking);
my $buf = "1234567890";

syswrite($sock, $buf, 10);
sysread($sock, $buf, 10);
$sock->flush;

print "Bytes 10 = $buf\n";
syswrite($sock, "1", 1);
print "\n";
$sock->flush;

sysread($sock, $buf, 2);
print "Bytes 2 = $buf\n";

__END__
C:\Temp>perl client.pl
A tcp socket on localhost connected to 7890
Bytes 10 = 1234567890

Bytes 2 = 1234567890

C:\Temp>perl client.pl
A tcp socket on localhost connected to 7890
Bytes 10 = 1234567890

Bytes 2 = 1234567890

C:\Temp>perl client.pl
A tcp socket on localhost connected to 7890
Bytes 10 = 1234567890

Bytes 2 = 1234567890

C:\Temp>