FD_ACCEPT 检测到，但随后调用 'accept' 失败并显示 10038 - WSAENOTSOCK

Question

基本上就是这样。同时，客户端调用连接成功。这怎么可能？我没有添加任何代码，因为我不知道错误在哪里。

服务器：检测到 FD_ACCEPT。调用 accept() 失败。

客户端：调用connect()成功。然后它检测到 FD_CONNECT。下面send()成功。之后的 send () 失败 (10053 - WSAECONNABORTED).

void Server::get_addressinfo() {
    // Resolve the local address and port to be used by the server
    const char * p = port.c_str();
    int iResult = getaddrinfo(NULL, p, &hints, &result);
    if (iResult != 0) {
        throw MyException("getaddrinfo failed.");
    }
}

void Server::create_socket() {
    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
    if (ListenSocket == INVALID_SOCKET) {
        throw MyException("socket creation failed.");
    }
}

void Server::bind_socket() {
    int iResult = bind(ListenSocket, result->ai_addr, (int) result->ai_addrlen);
    if (iResult == SOCKET_ERROR) {
        closesocket(ListenSocket);
        throw MyException("bind failed.");
    }
}

void Server::listen_for_connection() {
    int iResult = listen(ListenSocket, SOMAXCONN);
    if (iResult == SOCKET_ERROR) {
        closesocket(ListenSocket);
        throw MyException("listen failed.");
    }
}

void Server::goLive() {
    get_addressinfo();
    create_socket();
    bind_socket();
    listen_for_connection();
    wait_for(FD_ACCEPT);
    accept_connection();
}

void Server::wait_for(u_int event_type) {
    WSAEVENT event = WSACreateEvent();
    WSAEventSelect(ListenSocket, event, event_type);
    WSAEVENT lphEvents[1] = {event};
    WSANETWORKEVENTS NetworkEvents = {0};
    int nReturnCode = WSAWaitForMultipleEvents(1, &lphEvents[0], false, WSA_INFINITE, false);
    if (nReturnCode==WSA_WAIT_FAILED) 
        throw MyException("WSA__WAIT_FAILED.\n");
    if (WSAEnumNetworkEvents(ListenSocket, lphEvents[0], &NetworkEvents) == SOCKET_ERROR) 
        throw MyException("WSAEnumNetworkEvents => SOCKET_ERROR.\n");
    WSACloseEvent(event);  ***// THIS WAS THE BUG !!!***
}

void Server::accept_connection() {
    ClientSocket = accept(ListenSocket, NULL, NULL);
    if (ClientSocket == INVALID_SOCKET) {
        closesocket(ListenSocket);
        throw MyException("accept failed.");
    }
}

Answer 1

我对代码进行了一些修改并使其变得更好，但错误仍然存在。现在我找到了有问题的行：

WSACloseEvent(event);

注释掉后，服务器接受了连接。

来自 MSDN WSACloseEvent 函数文档：

The WSACloseEvent function closes the handle to an event object and frees resources associated with the event object.

我猜这意味着它释放了套接字 => 因此 10038 - WSAENOTSOCK。我爱上了不等于 INVALID_SOCKET 的套接字值。因此我认为套接字是有效的。这不是...

FD_ACCEPT 检测到，但随后调用 'accept' 失败并显示 10038 - WSAENOTSOCK

FD_ACCEPT detected, but then call 'accept' fails with 10038 - WSAENOTSOCK

c++

sockets

winsock2