nodejs/test/simple/test-child-process-fork-and-spawn.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
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// 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.
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// 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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var common = require('../common');
var assert = require('assert');
var spawn = require('child_process').spawn;
var fork = require('child_process').fork;

// Fork, then spawn. The spawned process should not hang.
switch (process.argv[2] || '') {
case '':
  fork(__filename, ['fork']).on('exit', checkExit);
  process.on('exit', haveExit);
  break;
case 'fork':
  spawn(process.execPath, [__filename, 'spawn']).on('exit', checkExit);
  process.on('exit', haveExit);
  break;
case 'spawn':
  break;
default:
  assert(0);
}

var seenExit = false;

function checkExit(statusCode) {
  seenExit = true;
  assert.equal(statusCode, 0);
  process.nextTick(process.exit);
}

function haveExit() {
  assert.equal(seenExit, true);
}