tcp_sock_set_keepintvl
int tcp_sock_set_keepintvl(struct sock *sk, int val);
EXPORT_SYMBOL(tcp_sock_set_keepintvl);
return tcp_sock_set_keepintvl(sk, val);
tcp_sock_set_keepintvl(ssk, msk->keepalive_intvl);
&tcp_sock_set_keepintvl,
tcp_sock_set_keepintvl(sock->sk, keepidle);
tcp_sock_set_keepintvl(sock->sk, keepidle);