'use strict'; const common = require('../common'); var dgram = require('dgram'); var source = dgram.createSocket('udp4'); var target = dgram.createSocket('udp4'); var messages = 0; target.on('message', common.mustCall(function(buf) { if (buf.toString() === 'abc') ++messages; if (buf.toString() === 'def') ++messages; if (messages === 2) { source.close(); target.close(); } }, 2)); target.on('listening', function() { // Second .send() call should not throw a bind error. const port = this.address().port; source.send(Buffer.from('abc'), 0, 3, port, '127.0.0.1'); source.send(Buffer.from('def'), 0, 3, port, '127.0.0.1'); }); target.bind(0);