si.Cb = uint32(unsafe.Sizeof(*si))
	si.Flags = STARTF_USESTDHANDLES
	if sys.HideWindow {
		si.Flags |= STARTF_USESHOWWINDOW
		si.ShowWindow = SW_HIDE
	}
	if sys.ParentProcess != 0 {
		err = updateProcThreadAttribute(si.ProcThreadAttributeList, 0, _PROC_THREAD_ATTRIBUTE_PARENT_PROCESS, unsafe.Pointer(&sys.ParentProcess), unsafe.Sizeof(sys.ParentProcess), nil, nil)
		if err != nil {
			return 0, 0, err
		}
	}