[Caml-list] C Interface question about failwith

[Christoph Bauer <christoph.bauer@lmsintl.com>]

Hi,

In C code I have a malloced-string error message, which must be freed. But I want also raise an OCaml exception
with this string. Actually what I need something like this:

static
void failwith_string_value(value msg)
{
  CAMLparam1(msg);
  caml_raise_with_arg(Field(caml_global_data, FAILURE_EXN), msg);
  CAMLnoreturn;
}

Then I could do:

  
     msg = caml_copy_string(s);
    free(s);
    failwith_string_value(msg);


But FAILURE_EXN is not defined in fail.h and more important
caml_global_data is defined in mlvalues.h, but I get an undefined reference link error.

Any ideas how to solve such a problem?

Thanks,
Christoph Bauer