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c6678网口发数结束判断

通过网口GBE实现上位机和dsp的通信,两边都用的是sendto函数,协议是udp,以上位机通过网口用sendto函数发数为例,如何判断接收方接收结束?是上位机端执行完sendto函数吗?如何判断上位机执行完sendto函数后dsp端是否接收结束呢?