ile creation mode
 * @param {Function} [callback] the callback function
 * @param {Error} callback.error not null if an error is occurred
 * @param {Number} callback.fd a file descriptor
 */</code></pre>
<pre><code class="language-coffeescript">##
# Asynchronous file open
# @param {String} path the path to open
# @param {String} flags flags for opening
# @param {Number|String} [mode=&#39;0666&#39;] file creation mode
# @param {Function} [callback] the callback function
# @param {Error} callback.error not nu