check_icmp_add
check_icmp_add(&env->sc_icmp_recv, EV_READ, tv, recv_icmp);
check_icmp_add(&env->sc_icmp_send, EV_WRITE, tv, send_icmp);
check_icmp_add(&env->sc_icmp6_recv, EV_READ, tv, recv_icmp);
check_icmp_add(&env->sc_icmp6_send, EV_WRITE, tv, send_icmp);
void check_icmp_add(struct ctl_icmp_event *, int, struct timeval *,