| 1 | 'use strict';
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| 2 | var net = require('net');
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| 3 |
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| 4 | module.exports = function (cb) {
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| 5 | var server = net.createServer();
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| 6 | server.unref();
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| 7 | server.on('error', cb);
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| 8 | server.listen(0, function () {
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| 9 | server.close(cb.bind(null, null, server.address().port));
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| 10 | });
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| 11 | };
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