code: def genl_msg_parser(ops, who, nlh, pp):
      
      if ops.co_genl is None:
          raise BUG
      return int(cmd_msg_parser(who, nlh, ops.co_genl, ops, pp))
docs: https://github.com/thom311/libnl/blob/libnl3_2_25/lib/genl/mngt.c#L85.
  
      Positional arguments:
      ops -- nl_cache_ops class instance.
      who -- sockaddr_nl class instance.
      nlh -- nlmsghdr class instance.
      pp -- nl_parser_param class instance.
  
      Returns:
      Integer, cmd_msg_parser() output.