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'use strict'; const common = require('../common'); const assert = require('assert'); const dgram = require('dgram'); const client = dgram.createSocket('udp4'); client.bind(0, common.mustCall(function() { client.on('message', common.mustCall(callback)); const port = this.address().port; const buf = Buffer.alloc(1); const interval = setInterval(function() { client.send(buf, 0, 0, port, '127.0.0.1', common.mustCall(callback)); }, 10); function callback(firstArg) { // If client.send() callback, firstArg should be null. // If client.on('message') listener, firstArg should be a 0-length buffer. if (firstArg instanceof Buffer) { assert.strictEqual(firstArg.length, 0); clearInterval(interval); client.close(); } } }));