Question

我的应用程序中有一个奇怪的错误：“每个套接字只有一个用法”地址。我在tcpview中看到了许多处于CLOSE_WAIT状态的套接字。我设置了延迟超时。但它不起作用。代码如下服务器：

TcpListener listener = new TcpListener(IPAddress.Any, 7874);
TcpClient client;
listener.Start();

while (true) 
{
    client = listener.AcceptTcpClient();
    ThreadPool.QueueUserWorkItem(ThreadProc, client);
}


private static void ThreadProc(object obj)
{
    var client = (TcpClient)obj;
    client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger, new LingerOption(true, 0));
    var stream = client.GetStream();
    using(client){
        using (MemoryStream ms = new MemoryStream())
        {
            int numBytesRead;
            byte[] data = new byte[1024];
            try
            {
                while ((numBytesRead = stream.Read(data, 0, data.Length)) > 0)
                {
                    ms.Write(data, 0, numBytesRead);
                }
            }catch(Exception ex)
            {}
            var str = Encoding.ASCII.GetString(ms.ToArray(), 0, (int)ms.Length);

        }
    }
}

客户端：

while (true)
{
    try
    {

        using (TcpClient client = new TcpClient(obj.ToString(), 7874))

        {
            client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger, new LingerOption(true, 0));
            var stream = client.GetStream();
            {
                stream.Write(bytes, 0, bytes.Length);

            }

            Thread.Sleep(timeSleep);
            //just trying all possible close
            client.Client.Shutdown(SocketShutdown.Both);
            client.Client.Close(0);
            client.Close();
        }
    }catch(Exception ex)
    {
        Console.WriteLine(ex);
    }
}

但是python客户端正常工作：

while True:
    s = socket.socket(
        socket.AF_INET, socket.SOCK_STREAM)
    try:
        s.connect((addr, 7874))
        l_onoff = 1
        l_linger = 0
        s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER,
                     struct.pack('ii', l_onoff, l_linger))
        s.send(b'test')
        while True:
            data =s.recv(1024)
            break
    except Exception as ex:
        print(str(datetime.datetime.now())+'NS FAIL')
    finally:
        s.close()

看起来像.NET tcpclient ignore set linger选项。同样的结果：

client.LingerState = new LingerOption(true, 0);

Answer 1

我认为你不需要设置LingerOption。我的猜测是你没有在服务器端（被接受的客户端）上释放客户端套接字，然后它在套接字堆栈中保持分配。

TCPClient“每个套接字地址和延迟选项只有一种用法

1 个答案: