text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // 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,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  var assert = require('assert');
  var common = require('../common');
  var fork = require('child_process').fork;
  var net = require('net');
  
  // child
  if (process.argv[2] === 'child') {
  
    var server = net.createServer();
  
    server.on('connection', function (socket) {
  
      process.on('disconnect', function () {
        socket.end((process.connected).toString());
      });
  
      // when the socket is closed, we will close the server
      // allowing the process to self terminate
      socket.on('end', function () {
        server.close();
      });
  
      socket.write('ready');
    });
  
    // when the server is ready tell parent
    server.on('listening', function () {
      process.send('ready');
    });
  
    server.listen(common.PORT);
  
  } else {
    // testcase
    var child = fork(process.argv[1], ['child']);
  
    var childFlag = false;
    var childSelfTerminate = false;
    var parentEmit = false;
    var parentFlag = false;
  
    // when calling .disconnect the event should emit
    // and the disconnected flag should be true.
    child.on('disconnect', function () {
      parentEmit = true;
      parentFlag = child.connected;
    });
  
    // the process should also self terminate without using signals
    child.on('exit', function () {
      childSelfTerminate = true;
    });
  
    // when child is listning
    child.on('message', function (msg) {
      if (msg === 'ready') {
  
        // connect to child using TCP to know if disconnect was emitted
        var socket = net.connect(common.PORT);
  
        socket.on('data', function (data) {
          data = data.toString();
  
          // ready to be disconnected
          if (data === 'ready') {
            child.disconnect();
            assert.throws(child.disconnect.bind(child), Error);
            return;
          }
  
          // disconnect is emitted
          childFlag = (data === 'true');
        });
  
      }
    });
  
    process.on('exit', function () {
      assert.equal(childFlag, false);
      assert.equal(parentFlag, false);
  
      assert.ok(childSelfTerminate);
      assert.ok(parentEmit);
    });
  }
  