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 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);