Function open

lib/fs.js:656–680

* Asynchronously opens a file. * @param {string | Buffer | URL} path * @param {string | number} [flags] * @param {string | number} [mode] * @param {( * err?: Error, * fd?: number * ) => any} callback * @returns {void}

(path, flags, mode, callback)

 * @returns {void}
 */
function open(path, flags, mode, callback) {
  if (arguments.length < 3) {
    callback = flags;
    flags = 'r';
    mode = 0o666;
  } else if (typeof mode === 'function') {
    callback = mode;
    mode = 0o666;
  } else {
    mode = parseFileMode(mode, 'mode', 0o666);
  }

  const flagsNumber = stringToFlags(flags);

  const h = vfsState.handlers;
  if (h !== null && vfsResult(h.open(path, flagsNumber, mode), callback)) return;

  path = getValidatedPath(path);
  callback = makeCallback(callback);

  const req = new FSReqCallback();
  req.oncomplete = callback;

  binding.open(path, flagsNumber, mode, req);
}

/**
 * Synchronously opens a file.