Method do_sendmsg

net/kernel_socket.cpp:500–507

    }

    ssize_t do_sendmsg(int sockfd, const struct msghdr* message, int flags, Timeout timeout) override {
        ssize_t n = photon::net::sendmsg(sockfd, message, flags | ZEROCOPY_FLAG, timeout);
        m_num_calls++;
        auto ret = zerocopy_confirm(sockfd, m_num_calls - 1, timeout);
        if (ret < 0)
            return ret;
        return n;
    }
};

class ZeroCopySocketServer : public KernelSocketServer {