关于独占端口

关于独占端口(2)
    if (LOBYTE (ws.wVersion) - 2)
        return;

    //make two sockets
    sock1 = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
    sock2 = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);

    val = TRUE;
    ret = setsockopt (sock1, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, //set to exclusive
                      (LPCSTR)&val, 4);

    if (ret)
    {
        //failed....
        //do something to clear the error....
        return;
    }    

    ZeroMemory (&in, sizeof(in));
    in.sin_family = AF_INET;
    in.sin_port = htons (EXCLUSIVE_PORT);
    in.sin_addr.s_addr = INADDR_ANY;

    printf ("Now to bind the first socket to port %d with SO_EXCLUSIVEADDRUSE\n", EXCLUSIVE_PORT);

    if (bind (sock1, (const struct sockaddr*)&in,  sizeof(in)))
    {
        //failed...
        //do something to clear the error...
        closesocket (sock1);
        return;
    }

    printf ("The first socket has been bound to port %d\n", EXCLUSIVE_PORT);    

    ret = setsockopt (sock2, SOL_SOCKET, SO_REUSEADDR,//try to reuse