Method do_connect

net/kernel_socket.cpp:234–260

    }

    ISocketStream* do_connect(const sockaddr_storage* remote,
                              const sockaddr_storage* local = nullptr) {
        auto stream = create_stream(remote->store.ss_family);
        auto deleter = [&](KernelSocketStream*) {
            auto errno_backup = errno;
            delete stream;
            errno = errno_backup;
        };
        std::unique_ptr<KernelSocketStream, decltype(deleter)> ptr(stream, deleter);
        if (!ptr || ptr->fd < 0) {
            LOG_ERROR_RETURN(0, nullptr, "Failed to create socket fd");
        }
        if (m_opts.setsockopt(ptr->fd) < 0) {
            return nullptr;
        }
        ptr->timeout(m_timeout);
        if (local != nullptr) {
            if (::bind(ptr->fd, local->get_sockaddr(), local->get_socklen()) != 0) {
                LOG_ERRNO_RETURN(0, nullptr, "fail to bind socket");
            }
        }
        auto ret = fd_connect(ptr->fd, remote->get_sockaddr(), remote->get_socklen());
        if (ret < 0) {
            LOG_ERRNO_RETURN(0, nullptr, "Failed to connect to ", remote->to_endpoint());
        }
        return ptr.release();
    }
};

class KernelSocketServer : public SocketServerBase {