Windows上的节点文件模式？

if (flags & _O_CREAT) {
    if (!((req->mode & ~current_umask) & _S_IWRITE)) {
      attributes |= FILE_ATTRIBUTE_READONLY;
    }
  }

关于fs.chmod的注释也很有趣.

/* Todo: st_mode should probably always be 0666 for everyone. We might also
   * want to report 0777 if the file is a .exe or a directory.
   *
   * Currently it's based on whether the 'readonly' attribute is set,which
   * makes little sense because the semantics are so different: the 'read-only'
   * flag is just a way for a user to protect against accidental deleteion,and
   * serves no security purpose. Windows uses ACLs for that.
   *
   * Also people Now use uv_fs_chmod() to take away the writable bit for good
   * reasons. Windows however just makes the file read-only,which makes it
   * impossible to delete the file afterWARDs,since read-only files can't be
   * deleted.
   *
   * IOW it's all just a clusterfuck and we should think of something that
   * makes slighty more sense.
   *
   * And uv_fs_chmod should probably just fail on windows or be a @R_680_10586@l no-op.
   * There's nothing sensible it can do anyway.
   */