设置和获取socket buffer size

int nrcvbuf=8192*2; //and now the default buffer is 8192    setsockopt(Socket,SOL_SOCKET,SO_RCVBUF,(char *)&nrcvbuf,sizeof(nrcvbuf));        int nRB = 0;    int Length = sizeof(int);    getsockopt(Socket,SOL_SOCKET,SO_RCVBUF,(char *)&nRB,&Length);