taglinefilesource code
keepopen122include/net/sock.hkeepopen,
keepopen173net/core/sock.csk->keepopen = valbool;
keepopen251net/core/sock.cval = sk->keepopen;
keepopen1636net/ipv4/tcp.cif(sk->keepopen) {
keepopen1778net/ipv4/tcp.cif (sk->keepopen) 
keepopen3234net/ipv4/tcp.csk->keepopen = 1;
keepopen3447net/ipv4/tcp.cif (sk->keepopen) 
keepopen3822net/ipv4/tcp.c} else if (sk->keepopen) {