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'use strict'; const common = require('../common'); const dgram = require('dgram'); const buf = Buffer.alloc(1024, 42); const socket = dgram.createSocket('udp4'); // Get a random port for send const portGetter = dgram.createSocket('udp4') .bind(0, 'localhost', common.mustCall(() => { socket.send(buf, 0, buf.length, portGetter.address().port, portGetter.address().address); // If close callback is not function, ignore the argument. socket.close('bad argument'); portGetter.close(); socket.on('close', common.mustCall()); }));