node/test/parallel/test-child-process-fork-ref2.js

// Copyright Joyent, Inc. and other Node contributors.
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// "Software"), to deal in the Software without restriction, including
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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'use strict';
const common = require('../common');
const fork = require('child_process').fork;

if (process.argv[2] === 'child') {
  console.log('child -> call disconnect');
  process.disconnect();

  setTimeout(function() {
    console.log('child -> will this keep it alive?');
    process.on('message', common.noop);
  }, 400);

} else {
  const child = fork(__filename, ['child']);

  child.on('disconnect', function() {
    console.log('parent -> disconnect');
  });

  child.once('exit', function() {
    console.log('parent -> exit');
  });
}