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

main()
{
        struct timeval tv1, tv2;

        gettimeofday(&tv2, (struct timezone *) 0);

        for (;;) {
                gettimeofday(&tv1, (struct timezone *) 0);

                if (tv1.tv_sec < tv2.tv_sec ||
                    (tv1.tv_sec == tv2.tv_sec && tv1.tv_usec < tv2.tv_usec)) {
                        printf("%d %d < %d %d\n",
                            tv1.tv_sec, tv1.tv_usec, tv2.tv_sec, tv2.tv_usec);
                }
                tv2 = tv1;
        }
}