timespec_compare
if(!zone_fname && timespec_compare(&zone_mtime, &mtime) >= 0) {
timespec_compare(&zone_mtime, &mtime) == 0) {
} else if (timespec_compare(&zone_mtime, &include_mtime) < 0) {
timespec_compare(&relative, &minimum_timeout) < 0)
int timespec_compare(const struct timespec *left, const struct timespec *right);
if (timespec_compare(&consumer_zone->mtime, &zone->mtime) == 0) {