xfrd_handle_zone
xfrd_handle_zone, zone);
event_set(&zone->zone_handler, fd, fl, xfrd_handle_zone, zone);
xfrd_handle_zone, wz);
xfrd_handle_zone(zone->zone_handler.ev_fd, 0, zone);
void xfrd_handle_zone(int fd, short event, void* arg);