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Re: [Libguestfs] [PATCH v2 3/7] mllib: expose libosinfo DB reading functions in mllib

On Tue, Feb 07, 2017 at 04:14:18PM +0100, Cédric Bosdonnat wrote:
> src/osinfo.c has generic code to read the libosinfo DB. Add a wrapper
> around it to expose it in mllib for use in ocaml code.

There are at least 3 changes in this code that I can spot:

 - A code refactoring that moves some functions from osinfo.c -> osinfo-iso.c.

 - Something to do with read_osinfo_db_callback which I didn't
   fully understand.

 - OCaml bindings.

These need to be separate commits, I'm not smart enough to review
all three mixed together.

> +static int
> +read_osinfo_db_callback_wrapper (guestfs_h *g, const char *path, void *opaque)
> +{
> +  CAMLparam0 ();
> +  CAMLlocal2 (pathv, v);
> +  struct callback_wrapper_args *args = opaque;
> +
> +  assert (path != NULL);
> +  assert (args != NULL);
> +
> +  pathv = caml_copy_string (path);
> +
> +  v = caml_callback_exn (*args->fvp, pathv);
> +
> +  if (Is_exception_result (v)) {
> +    *args->exnp = Extract_exception (v);
> +    return -1;

You copied buggy code from the OCaml wrapper for visit.c.  This code
will crash whenever an exception is thrown.  Check the latest version
of that wrapper for how to fix.


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