#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/time.h>
#define MAXLEN 524288

// gcc -I/usr/include -lc test.c
int main(int argc,char* argv)
{
unsigned int my_gettime()
{
struct timeval tout;
struct timezone tz;
gettimeofday(&tout, &tz);
return (unsigned int)tout.tv_usec;
}
struct timespec tim;
unsigned int start_time1, stop_time1;
int interval, interval2;
int jitter,maxj, minj, jitter2;
interval=0;
maxj=0; //max jitter
minj=0; //min jitter
jitter=0;

start_time1= my_gettime();
while (1) {
        tim.tv_sec=0;
        tim.tv_nsec=100000000; // 0.1 sec
        nanosleep(&tim, NULL);
        stop_time1=my_gettime();
        interval2=(int)(stop_time1-start_time1);
        jitter2=interval2-interval;
        if (jitter2<0) jitter2=jitter2+1000000; //negative wa for 0.1 sec
        if (jitter2>maxj) maxj=jitter2;
        if ((jitter2<minj)||(0==minj)) minj=jitter2;
        if (0!=jitter-jitter2) printf("i %d max/min %d/%d \n", jitter2, maxj, minj);
        jitter=jitter2;
        start_time1=my_gettime();
    };
};