Hi all, I have a couple of questions about Green Card and exceptions. I am interfaceing to the GSL to get access to a few functions, and eventually interface all of the special functions to Haskell. And unlike my DSP library, and am trying to get it right the first time. :) Below is a Green Card interface to one of the functions. %fun airy_Ai_e :: Double -> (Double, Double) %call (double x) %code int rc; % double val; % double err; % gsl_sf_result result; % rc = gsl_sf_airy_Ai_e(x, GSL_PREC_DOUBLE, &result); % val = result.val; % err = result.err; %result (double val, double err) This definition works, but it ignores the return code from the library function. The various return codes are from an enum defined in a header file. I would like to throw a Haskell exception (one of the ArithExceptions defined in Control.Exception) depending on the value of "rc". Do I need to create a new DIS for the return values (which are an enum defined in a header), change the function to return a triplet (var,err,rc), and then throw the exception in Haskell land? Is there a way I can do this directly from the GC interface? If I have to create a DIS, can this be shared across several modules that all need the same functionality? Thanks. -- Matthew Donadio (m.p.donadio@ieee.org)