-XBT_INTERNAL int MC_protocol_send(int socket, void* message, size_t size);
-XBT_INTERNAL int MC_protocol_send_simple_message(int socket, e_mc_message_type type);
-XBT_INTERNAL int MC_protocol_hello(int socket);
-XBT_INTERNAL ssize_t MC_receive_message(int socket, void* message, size_t size, int options);
+XBT_PRIVATE int MC_protocol_send(int socket, const void* message, size_t size);
+XBT_PRIVATE int MC_protocol_send_simple_message(int socket, e_mc_message_type type);
+XBT_PRIVATE ssize_t MC_receive_message(int socket, void* message, size_t size, int options);