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Say one part of a program writes some stuff to a socket and another part of the same program reads stuff from that same socket. If an external tool writes to that very same socket, how would I differentiate who wrote what to the socket (using the part that reads it)? Would using a named pipe work?
If you are talking about TCP the situation you describe is impossible, because connections are 1-to-1. If you mean UDP, you can get the sender address by setting the appropriate flags in the recvmesg() function.