Global Sybase variables and ctlib

Is there an easy way to get back global variable information (especially
@@error) without having to do another select?

I have a stored procedure I am calling.  It does not check the error
conditions of the last insert or update and I cannot modify the stored
procedure.  My concern is that this returns back a bunch of information
and I would like to be able to check for errors as I am getting back
stuff.  Currently I get error messages back from Sybperl, but no real
reported error codes.  Do I need to rewrite the error handling hooks to
do this or is there a better shortcut?