int (*clock_gettime)(clockid_t, timespec* ts) = &::clock_gettime;
int64_t (*clock_gettime_ns)(clockid_t) = &clock_gettime_ns_fallback;
int (*clock_gettime)(clockid_t, timespec* ts) = &::clock_gettime;
int64_t (*clock_gettime_ns)(clockid_t) = &clock_gettime_ns_fallback;