MPTCP_INFO
case MPTCP_INFO:
if (!ASSERT_OK(getsockopt(client_fd, SOL_MPTCP, MPTCP_INFO, &info, &optlen),
#ifndef MPTCP_INFO
err = getsockopt(fd, SOL_MPTCP, MPTCP_INFO, &subflows, &len);
ret = getsockopt(fd, SOL_MPTCP, MPTCP_INFO, &i, &olen);
#ifndef MPTCP_INFO