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You're reading from the wrong socket. After you do fd=accept(sock, ...) you should be reading from fd, not sock.

One mistake I notice straight-off is:


retval2=msgrcv(ad,&receive,1,1,0777);


The size parameter is in bytes, so it should be sizeof(receive) - your current code allows only a single byte to...

Yes, you either need a key or to pass the segment's ID. IPC_PRIVATE is meant to be used between two programs that can pass the ID, either because one forked the other and the ID is resident, or...