DS_DHDL_INVALID
if (ds_add_port(port_id, ldc_id, DS_DHDL_INVALID, NULL, 1) != 0)
ds_domain_hdl_t ds_my_domain_hdl = DS_DHDL_INVALID;
if (newport->domain_hdl == DS_DHDL_INVALID) {
port->domain_hdl = DS_DHDL_INVALID;
dhdl = DS_DHDL_INVALID;
dhdl = DS_DHDL_INVALID;