Method read

lib/internal/vfs/file_system.js:826–835

* Reads from a file descriptor asynchronously. * @param {number} fd The file descriptor * @param {Buffer} buffer The buffer to read into * @param {number} offset The offset in the buffer * @param {number} length The number of bytes to read * @param {number|null} position The position

(fd, buffer, offset, length, position, callback)

   * @param {Function} callback Callback (err, bytesRead, buffer)
   */
  read(fd, buffer, offset, length, position, callback) {
    const vfd = getVirtualFd(fd);
    if (!vfd) {
      process.nextTick(callback, createEBADF('read'));
      return;
    }

    vfd.entry.read(buffer, offset, length, position)
      .then(({ bytesRead }) => callback(null, bytesRead, buffer), (err) => callback(err));
  }

  /**
   * Writes to a file descriptor asynchronously.