Timer to find elapsed time in a function call in C

Question

I want to calculate time elapsed during a function call in C, to the precision of 1 nanosecond.

Is there a timer function available in C to do it?

If yes ple

Answer 1

There is no timer in c which has guaranteed 1 nanosecond precision. You may want to look into clock() or better yet The POSIX gettimeofday()