door_stack_copyout
if (door_stack_copyout(start, layout->dl_descp, descsize)) {
if (door_stack_copyout(ct->d_buf, datap, datasize)) {
if (door_stack_copyout(&di, infop, sizeof (di))) {
if (door_stack_copyout(&dr, layout->dl_resultsp, sizeof (dr))) {
if (door_stack_copyout(&dr32, layout->dl_resultsp,