catch in c

[Marcus Comstedt (ACROSS) (Hail Ilpalazzo!) @ Pike (-) developers forum]

ONERROR handle;
SET_ONERROR (handle, my_free_function, my_mem);
/* do stuff which may throw */
UNSET_ONERROR (handle);

If you want my_free_function to be called even if nothing was thrown,
use CALL_AND_UNSET_ONERROR instead.