listen.js

var net = require('net');
var server = net.createServer(function(socket) {
	console.log('New client');
	socket.on('data', function() {
		console.log('data');
	})
});
server.listenFD(3, 'tcp4');

listen.rb

require 'socket'
server = TCPServer.new('127.0.0.1', 3000)
exec("node", "listen.js")