1202 setsockopt在程序中的实例

程序中的代码：

     timeout = 100;

       ret = setsockopt(m_hSocket, SOL_SOCKET, SO_RCVTIMEO,

                (char*)&timeout, sizeof(timeout));

 

    if(ret == SOCKET_ERROR)

    {

              if (m_hSocket != INVALID_SOCKET) {

                     closesocket(m_hSocket);

              }

        return FALSE;

    }

   

    ret = setsockopt(m_hSocket, SOL_SOCKET, SO_SNDTIMEO,

                (char*)&timeout, sizeof(timeout));

 

    if (ret == SOCKET_ERROR)

    {

              if (m_hSocket != INVALID_SOCKET) {

                     closesocket(m_hSocket);

              }

        return FALSE;

}

 

在send(),recv()过程中有时由于网络状况等原因，发收不能预期进行,而设置收发时限：

int nNetTimeout=1000;//1秒

//发送时限

setsockopt(socket，SOL_SOCKET,SO_SNDTIMEO，(char *)&nNetTimeout,sizeof(int));

//接收时限

 setsockopt(socket，SOL_SOCKET,SO_RCVTIMEO，(char *)&nNetTimeout,sizeof(int));

SO_RCVTIMEO and SO_SNDTIMEO

When using the recv function, if no data arrives during the period specified in SO_RCVTIMEO, the recv function completes.

If a send or receive operation times out on a socket, the socket state is indeterminate, and should not be used; 超时后不可靠，在此实例中，m_hSocket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); socket使用的协议是icmp，socket不可靠直接Close并返回FALSE。