first commit

lib/getPort.js

@@ -0,0 +1,17 @@
+var portrange = 40000;
+ 
+module.exports = function(cb) {
+    var port = portrange;
+    ++portrange;
+ 
+    var server = require("net").createServer();
+    server.listen(port, function (err) {
+        server.once('close', function () {
+            cb(port);
+        });
+        server.close();
+    });
+    server.on('error', function (err) {
+        getPort(cb);
+    });
+};