Function importFd

lib/internal/fs/streams.js:137–161

(stream, options)

}

function importFd(stream, options) {
  if (typeof options.fd === 'number') {
    // When fd is a raw descriptor, we must keep our fingers crossed
    // that the descriptor won't get closed, or worse, replaced with
    // another one
    // https://github.com/nodejs/node/issues/35862
    stream[kFs] = options.fs || fs;
    return options.fd;
  } else if (typeof options.fd === 'object' &&
             options.fd instanceof FileHandle) {
    // When fd is a FileHandle we can listen for 'close' events
    if (options.fs) {
      // FileHandle is not supported with custom fs operations
      throw new ERR_METHOD_NOT_IMPLEMENTED('FileHandle with fs');
    }
    stream[kHandle] = options.fd;
    stream[kFs] = FileHandleOperations(stream[kHandle]);
    stream[kHandle][kRef]();
    options.fd.on('close', FunctionPrototypeBind(stream.close, stream));
    return options.fd.fd;
  }

  throw new ERR_INVALID_ARG_TYPE('options.fd',
                                 ['number', 'FileHandle'], options.fd);
}

function ReadStream(path, options) {
  if (!(this instanceof ReadStream))