rtadvd_add_timer
ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
pfx->pfx_timer = rtadvd_add_timer(prefix_timeout, NULL, pfx, NULL);
ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
struct rtadvd_timer *rtadvd_add_timer(struct rtadvd_timer *(*)(void *),