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Which source IP address is returned if recvfrom return more than 1 packets of data?

According to the CC3000 errata (SWRZ044B–Revised May 2013), 

2.13 UDP packets are not received one-by-one by the host

If more than one packets are returned and the packets are sent from different hosts (different IP), which IP address is returned in the fifth parameter ( sockaddr * from)? First packet?, Last packet? or random?

Thanks.