IC and C out-parameter to Erlang

[Jouni Ryno]

I have some difficulties in understanding how to pass an object from
C-server to Erlang-client.

Currently I have 

module tmsystem
    typedef sequence<char> message;
    interface telemetry {
        void write(in message telecommand);
        message read_tm(in message telecommand);
    };
};
	
I can nicely send an Erlang list (from Erlang) with the write-procedure 
to a C-server.

But I'm not really understanding how I should implement the counterpart
read_tm, which is called from Erlang in order to receive a list as a result.
I know that I should somehow provide the allocated object to C_server to but
the result in. So now I send large enough (12*1024 list elements!) 
in-parameter and make the result to point to that list-structure.

What is the correct way to this (the allocation for the result) ?

  Jouni Rynö                     	Tel. (+358)-9-19294656
  Finnish Meteorological Institute      TLX 124436 EFKL FI
  Geophysical Research                  TFAX (+358)-9-19294603
  P.O.BOX 503                           Internet: Jouni.Ryno@REDACTED
  FIN-00101 Helsinki                    X-400: /G=Jouni/S=Ryno
  Finland                                      /O=il/P=il/A=mailnet/C=fi/

  WWW: http://www.geo.fmi.fi/           WWW: http://www.geo.fmi.fi/~ryno/

  "It's just zeros and ones, it cannot be hard"