taglinefilesource code
sock_rspace342include/net/sock.hextern unsigned long    sock_rspace(struct sock *sk);
sock_rspace386net/ipv4/packet.csock_rspace,
sock_rspace310net/ipv4/raw.csock_rspace,
sock_rspace5416net/ipv4/tcp.csock_rspace,
sock_rspace740net/ipv4/udp.csock_rspace,