void link_free(Link *link);
int link_get(Manager *m, int ifindex, Link **ret);
int link_add(Manager *manager, struct udev_device *device, Link **ret);
void link_free(Link *link);
int link_get(Manager *m, int ifindex, Link **ret);
int link_add(Manager *manager, struct udev_device *device, Link **ret);