-extern int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
-extern int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y);
-extern int timeval_add_time(struct timeval *result, int sec, int usec);
-/* gettimeofday() timeval in 64 bit ms */
-extern long long timeval_ms();
+int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
+int timeval_add_time(struct timeval *result, long sec, long usec);