get_and_unpack_sets
int get_and_unpack_sets(int, msg, msg, msg);
if (get_and_unpack_sets(0, MSG_disksetupdone,
if (get_and_unpack_sets(1, MSG_disksetupdoneupdate,
if (get_and_unpack_sets(0, NULL, MSG_unpackcomplete, MSG_abortunpack) != 0)