recvfrom() operates in the same manner as recv() except that it is able to return the address of the socket from which the message was sent.  For connected datagram sockets, recvfrom() simply returns the same address as getpeername() (see getpeername(2)).  For stream sockets, recvfrom() retrieves data in the same manner as recv(), but does not return the socket address of the sender.

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Returns the address of the sender if SOCKET's protocol supports this; returns an empty string otherwise.