UUID_CACHE_BUFNAME
fmd_buf_destroy(hdl, NULL, UUID_CACHE_BUFNAME);
fmd_buf_create(hdl, NULL, UUID_CACHE_BUFNAME, newsz);
fmd_buf_write(hdl, NULL, UUID_CACHE_BUFNAME, uuid_cache, sz);
size_t sz = fmd_buf_size(hdl, NULL, UUID_CACHE_BUFNAME);
fmd_buf_read(hdl, NULL, UUID_CACHE_BUFNAME, uuid_cache, sz);