user_data_execute
return user_data_execute(user_data, USER_COMMAND_QUIT, NULL);
return user_data_execute(user_data, USER_COMMAND_RECONNECT, NULL);
return user_data_execute(user_data, USER_COMMAND_RENEGOTIATE, NULL);
return user_data_execute(user_data, USER_COMMAND_KEY_UPDATE,
ret = user_data_execute(user_data, cmd, arg_start);