ds_unreg_hdl
(void) ds_unreg_hdl(hdl);
extern int ds_unreg_hdl(ds_hdl_t hdl);
if ((rv = ds_unreg_hdl(hdl)) != 0) {
(void) ds_unreg_hdl(hdl);
if ((rv = ds_unreg_hdl(hdl)) != 0) {
int ds_unreg_hdl(ds_svc_hdl_t hdl);