code: def set_pid_file(self, fpath, before_priv_drop=True, safe=False):
          
          command = 'pidfile'
  
          if not before_priv_drop:
              command += '2'
  
          if safe:
              command = 'safe-' + command
  
          self._set(command, fpath)
  
          return self._section
docs: Creates pidfile before or after privileges drop.
  
          :param str|unicode fpath: File path.
  
          :param bool before_priv_drop: Whether to create pidfile before privileges are dropped.
  
              .. note:: Vacuum is made after privileges drop, so it may not be able
                  to delete PID file if it was created before dropping.
  
          :param bool safe: The safe-pidfile works similar to pidfile
              but performs the write a little later in the loading process.
              This avoids overwriting the value when app loading fails,
              with the consequent loss of a valid PID number.