docs: def retry_mkstemp(suffix='', prefix='tmp', directory=None, max_retries=3):
      """
      Make mkstemp more robust against AFS glitches.
      """
      if directory is None:
          directory = current_app.config['CFG_TMPSHAREDDIR']
      for retry_count in range(1, max_retries + 1):
          try:
              tmp_file_fd, tmp_file_name = tempfile.mkstemp(suffix=suffix,
                                                            prefix=prefix,
                                                            dir=directory)
          except OSError as e:
              if e.errno == 19 and retry_count <= max_retries:
                  # AFS Glitch?
                  time.sleep(10)
              else:
                  raise
          else:
              break
      return tmp_file_fd, tmp_file_name