verify_sockopt
ASSERT_OK(verify_sockopt(client_fd, CUSTOM_INHERIT1, "connect", 0), "verify_sockopt1");
ASSERT_OK(verify_sockopt(client_fd, CUSTOM_INHERIT2, "connect", 0), "verify_sockopt2");
ASSERT_OK(verify_sockopt(client_fd, CUSTOM_LISTENER, "connect", 0), "verify_sockopt ener");
err += verify_sockopt(fd, CUSTOM_INHERIT1, "listen", 1);
err += verify_sockopt(fd, CUSTOM_INHERIT2, "listen", 1);
err += verify_sockopt(fd, CUSTOM_LISTENER, "listen", 1);
err += verify_sockopt(client_fd, CUSTOM_INHERIT1, "accept", 1);
err += verify_sockopt(client_fd, CUSTOM_INHERIT2, "accept", 1);
err += verify_sockopt(client_fd, CUSTOM_LISTENER, "accept", 0);