#include <stdlib.h>
#include <stdio.h>
#include <time.h>

main() {
   int i;
   struct timespec ts;
   long long nano=0;
   long long p1=0, p2=0, p3=0;
   char b[10];

   for (;;)  {
      clock_gettime(CLOCK_MONOTONIC, &ts);
      p3 = p2;
      p2 = p1;
      p1 = nano;
      nano = ts.tv_nsec + ts.tv_sec * 1000000000LL;
      if (p1 < p2)  {
         clock_gettime(CLOCK_REALTIME, &ts);
         strftime(b, 10, "%H:%M:%S", localtime(&ts.tv_sec));
         printf("%s: %016llx %016llx %016llx %016llx\n", 
                b, p3, p2, p1, nano);
      }
   }
}