#!/usr/bin/perl -w
# biclient - bidirectional forking client
use strict;
use IO::Socket;
my ($host, $port, $kidpid, $handle, $line);

unless (@ARGV == 2) { die "usage: $0 host port" }
($host, $port) = @ARGV;

# create a tcp connection to the specified host and port
$handle = IO::Socket::INET->new(Proto     => "tcp",
                                PeerAddr  => $host,
                                PeerPort  => $port)
or die "can't connect to port $port on $host: $!";

$handle->autoflush();              # so output gets there right away
print STDERR "[Connected to $host:$port]\n";

# split the program into two processes, identical twins
die "can't fork: $!" unless defined($kidpid = fork());

if ($kidpid) {                      
    # parent copies the socket to standard output
    while (defined ($line = <$handle>)) { print STDOUT "$0:$line"; }
    kill("TERM" => $kidpid);        # send SIGTERM to child
} else {                              
    # child copies standard input to the socket
    while (<STDIN>) {
        print "child write to handle line= [$_]\n";
        print $handle $_ . "\015\012"; 
    }
}
print "$kidpid exitting\n";
exit;