warp.c

#include <sys/time.h>
#include <stddef.h>
#include <stdio.h>

#define THRESHOLD 1000

int main()
{
	struct timeval a;
	struct timeval b;
	gettimeofday(&b, NULL);
	for (;;) {
		a = b;
		gettimeofday(&b, NULL);
		long long int diff = 100000*(b.tv_sec - a.tv_sec) + b.tv_usec - a.tv_usec;
		if (diff > THRESHOLD) {
			printf("time warped by %lld us\n", diff);
		}
	}
	return 0;
}