Function readv

lib/fs.js:912–939

* Reads file from the specified `fd` (file descriptor) * and writes to an array of `ArrayBufferView`s. * @param {number} fd * @param {ArrayBufferView[]} buffers * @param {number | null} [position] * @param {( * err?: Error, * bytesRead?: number, * buffers?: ArrayBufferView[] * ) => an

(fd, buffers, position, callback)

 * @returns {void}
 */
function readv(fd, buffers, position, callback) {
  function wrapper(err, read) {
    callback(err, read || 0, buffers);
  }

  fd = getValidatedFd(fd);
  validateBufferArray(buffers);
  callback ||= position;
  validateFunction(callback, 'cb');

  if (typeof position !== 'number')
    position = null;

  const h = vfsState.handlers;
  if (h !== null) {
    const promise = h.readv(fd, buffers, position);
    if (promise !== undefined) {
      PromisePrototypeThen(promise,
                           (read) => callback(null, read, buffers), callback);
      return;
    }
  }

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

  binding.readBuffers(fd, buffers, position, req);
}

ObjectDefineProperty(readv, kCustomPromisifyArgsSymbol,
                     { __proto__: null, value: ['bytesRead', 'buffers'], enumerable: false });