Function writev

lib/fs.js:1145–1177

* Writes an array of `ArrayBufferView`s to the * specified `fd` (file descriptor). * @param {number} fd * @param {ArrayBufferView[]} buffers * @param {number | null} [position] * @param {( * err?: Error, * bytesWritten?: number, * buffers?: ArrayBufferView[] * ) => any} callback *

(fd, buffers, position, callback)

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

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

  if (buffers.length === 0) {
    process.nextTick(callback, null, 0, buffers);
    return;
  }

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

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

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

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

ObjectDefineProperty(writev, kCustomPromisifyArgsSymbol, {
  __proto__: null,