CONVTCK
#define CONVTCK(r) \
#define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz))
#undef CONVTCK
#define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz))
#undef CONVTCK