winname2uid_gid_cache_t
idmap_purge_winname2uid_gid_cache(winname2uid_gid_cache_t *cache, size_t limit)
winname2uid_gid_cache_t winname2uid_gid;
idmap_purge_winname2uid_gid_cache(winname2uid_gid_cache_t *avl, size_t limit);