#!/usr/bin/perl -w
use IPC::Run qw(start pump finish timeout);

my $tok_program = "/bin/./cat"; 

my ($TOK_IN, $TOK_OUT, $TOK_ERR);
my $TOK = start [$tok_program], 
     '<', \$TOK_IN,
     '1>pty>',\$TOK_OUT, 
     '2>', \$TOK_ERR , 
     debug => 0 or die "Error: $?;\n"; 


while (my $line = <STDIN> ) {
    # Send input.
    $TOK_IN = $line;
    pump $TOK while length $TOK_IN;

    # Wait for output.
    pump $TOK while $TOK_OUT !~ /\n\z/;
    my $msg = $TOK_OUT;
    chomp($msg);
    print "out:$TOK_OUT;;MESSAGE=$msg;;END\n"; 

    $TOK_OUT = '';
}

finish($TOK) or die "returned: $?";