recv_icmp
check_icmp_add(&env->sc_icmp_recv, EV_READ, tv, recv_icmp);
check_icmp_add(&env->sc_icmp6_recv, EV_READ, tv, recv_icmp);
event_again(&cie->ev, s, EV_TIMEOUT|EV_READ, recv_icmp,
void recv_icmp(int, short, void *);