DEVCTL_DATASET
SET_FOREACH(cmd, DEVCTL_DATASET(top)) {
DATA_SET(DEVCTL_DATASET(set), function ## _devctl_command)
SET_DECLARE(DEVCTL_DATASET(name), struct devctl_command); \
return (devctl_table_handler(SET_BEGIN(DEVCTL_DATASET(name)), \
SET_LIMIT(DEVCTL_DATASET(name)), ac, av)); \
SET_DECLARE(DEVCTL_DATASET(top), struct devctl_command);