设置Socket缓冲区
int zero = 0;
setsockopt( ov->m_Socket, SOL_SOCKET, SO_SNDBUF, (char *) &zero, sizeof zero );
setsockopt( ov->m_Socket, SOL_SOCKET, SO_RCVBUF, (char *) &zero, sizeof zero );
setsockopt( ov->m_Socket, SOL_SOCKET, SO_SNDBUF, (char *) &zero, sizeof zero );
setsockopt( ov->m_Socket, SOL_SOCKET, SO_RCVBUF, (char *) &zero, sizeof zero );