C linux equivalent of windows QueryPerformanceCounter

Question

Is there an equivalent C function in linux for reading the CPU counter and its frequency?

I am looking for something similair to QueryPerformanceCounter function that re

Answer 1

clock_gettime(2), with an argument of CLOCK_REALTIME_HR.

Answer 2

clock_gettime() with CLOCK_MONOTONIC_RAW

Answer 3

The HAVEGE library uses the CPU counter. Check out its source code here. The relevant file is src/hardtick.h.