clock_gettime_tv
static int clock_gettime_tv(clockid_t, struct timeval *);
if (clock_gettime_tv(CLOCK_MONOTONIC, &sc->t_start) == -1)
if (clock_gettime_tv(CLOCK_MONOTONIC, &t_cur) == -1)
if (clock_gettime_tv(CLOCK_MONOTONIC, &t_cur) == -1)
if (clock_gettime_tv(CLOCK_MONOTONIC, &t_cur) == -1)