csrc/node-v0.10.24/test/simple/test-cluster-eaddrinuse.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// USE OR OTHER DEALINGS IN THE SOFTWARE.

// Check that having a worker bind to a port that's already taken doesn't
// leave the master process in a confused state. Releasing the port and
// trying again should Just Work[TM].

var common = require('../common');
var assert = require('assert');
var cluster = require('cluster');
var fork = require('child_process').fork;
var net = require('net');

var id = '' + process.argv[2];

if (id === 'undefined') {
  var server = net.createServer(assert.fail);
  server.listen(common.PORT, function() {
    var worker = fork(__filename, ['worker']);
    worker.on('message', function(msg) {
      if (msg !== 'stop-listening') return;
      server.close(function() {
        worker.send('stopped-listening');
      });
    });
  });
}
else if (id === 'worker') {
  var server = net.createServer(assert.fail);
  server.listen(common.PORT, assert.fail);
  server.on('error', common.mustCall(function(e) {
    assert(e.code, 'EADDRINUSE');
    process.send('stop-listening');
    process.once('message', function(msg) {
      if (msg !== 'stopped-listening') return;
      server = net.createServer(assert.fail);
      server.listen(common.PORT, common.mustCall(function() {
        server.close();
      }));
    });
  }));
}
else {
  assert(0);  // Bad argument.
}