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我有一个在 WinXp(i7, 2.1 Ghz) 上运行的主从应用程序 Master，从属应用程序是一个控制器板。主站向从站发送请求，从站作为响应循环向主站发送数据。从机循环发送的数据为每 0.5 毫秒 1000 字节。当 master 发出发送数据的请求时，控制台会报错。

“ Select() 函数错误代码:: 10038 ”。

这是 的代码WSAENOTSOCK。

该应用程序是一个单线程应用程序，从从站接收数据。从错误看来，套接字在 select 函数检查之前已关闭。

任何人都可以指点我的方向吗？

：：：源代码：：：：

int Receive()
{
    int rc;
    socklen_t cli_alen;
    struct timeval to;
    fd_set read_fd, write_fd, excep_fd;

    FD_ZERO(&write_fd);
    FD_ZERO(&excep_fd);

sock_again:
    if (!_isSocketOpen) 
    {
        return 0;
    }
    FD_ZERO(&read_fd);
    FD_SET(_sock_fd, &read_fd);
    to.tv_sec =  0;
    to.tv_usec = 0;
    cli_alen = sizeof(SOCKADDR_IN);

    rc = select(_sock_fd+1, &read_fd, &write_fd, &excep_fd, &to);

    if (rc == 0 )  
    {   // Timeout
        // printf("XCP Port %d : select() timded out \n", _port);
        acess = 1;
        goto sock_again;
    } 
    else if (rc == SOCKET_ERROR) 
    {
        // Error
        LogError("XCP: select() error %d", WSAGetLastError());
        closesocket(_sock_fd);
        return -1;
    }
    else 
    {
        // Data
        if (!FD_ISSET(_sock_fd, &read_fd)) 
        {
            LogError("XCP: select() wrong socket descr");
            return -1;
        }
        else
        {
            //read data
            rc = recvfrom(_sock_fd, (char *)_recvBuf, UDP_RECVBUFLEN, 0, (LPSOCKADDR)&_saddr, &cli_alen);
}
}
}

:::: 已编辑 ::::

int CloseUdpConnection()
{
    if (closesocket(_sock_fd) == SOCKET_ERROR) {
        LogError("closesocket() error: %d", WSAGetLastError());
        return -1;
    }
    _isSocketOpen = 0;
    LogError("successfully closed socket %s:%d", _address, _port);
    return 0;
}

::::: 调试跟踪 :::::

xcpApplication.exe -i 192.168.1.100 -p 5555
c
--> Connecting...
<-- Connection established
t
--> Setting daq signal list...
Sorting daq signal list...
Sorting done
<-- Daq signal list set
d
--> Configuring daq lists...
<-- Configuration done
r
--> Starting measurement...
<-- Measurement started

**_sock_fd: -448997078**
XCP: select() error 10038

：：：：： 痕迹 ：：：：

--> Starting measurement...
<-- Measurement started
_sock_fd: -1963260928 
_sock_fd: 0x8afb0400
XCP: select() error 10038

：：：：：： 痕迹 ：：：：

xcpApplication.exe -i 192.168.1.100 -p 5555

_sock_fd: 1936 _sock_fd: 0x790
successfully opened socket 192.168.1.100:5555

--> Connecting...
<-- Connection established
t
--> Setting daq signal list...
Sorting daq signal list...
Sorting done
<-- Daq signal list set
d
--> Configuring daq lists...
<-- Configuration done
c
--> Connecting...
<-- Connection established
r
--> Starting measurement...
<-- Measurement started
_sock_fd: 901186560 _sock_fd: 0x35b70400
XCP: select() error 10038
4

1 回答 1

6 
>net helpmsg 10038

An operation was attempted on something that is not a socket.

You can safely close a socket in the TCP/IP sense, using the shutdown() function. But don't call closesocket() on a SOCKET handle which is in use by select() or poll().

Actually, in Win32 you will usually prefer to use WSAAsyncSelect or WSAEventSelect instead.

If your application is single-threaded and doesn't use asynchronous callbacks, then you can't call closesocket during the select call. And I see that you return immediately after calling closesocket. So you must be entering the function with an invalid socket, but _isSocketOpen is true. Perhaps you should set that flag to false when calling closesocket().

于 2013-03-19T15:54:17.243 回答