AvahiUsec avahi_timeval_diff(const struct timeval *a, const struct timeval *b);
/** Add a number of microseconds to the specified timeval structure and return it. *a is modified. */
AvahiUsec avahi_timeval_diff(const struct timeval *a, const struct timeval *b);
/** Add a number of microseconds to the specified timeval structure and return it. *a is modified. */