TIMEVAL_TO_TIMESPEC, TIMESPEC_TO_TIMEVAL - convert between time structures

#define _GNU_SOURCE
#include <sys/time.h>
void TIMEVAL_TO_TIMESPEC(const struct timeval *tv, struct timespec *ts);
void TIMESPEC_TO_TIMEVAL(struct timeval *tv, const struct timespec *ts);

These macros convert from a timeval(3type) to a timespec(3type) structure, and vice versa, respectively.

This is especially useful for writing interfaces that receive a type, but are implemented with calls to functions that receive the other one.