Re: [xml] using "raise" in Python error handler callbacks

[Daniel Veillard <veillard redhat com>]

On Thu, Mar 31, 2005 at 07:57:04PM -0500, Stefan Seefeld wrote:
> Daniel Veillard wrote:
> >On Thu, Mar 31, 2005 at 10:25:41PM +0100, Andrew McDermott wrote:
> >
> >>Whilst experimenting with the Python bindings I noticed that exceptions 
> >>are not propagated when using registerErrorHandler().  If I run the 
> >>following I get the error message:
> >>
> >>	/etc/passwd : failed to parse.
> >>
> >>However, there is no Traceback for the "raise".  Is this correct?
> >>
> >>import libxml2
> >>import sys
> >
> >
> >  You have
> >    Python calling C calling Python.
> >the internal exception in the callback does not cross the C boundary
> >I don't see how this could work without disastrous side effects like
> >memory leaks or general instability in the program.
> 
> I don't think this is quite accurate. Think about python as a high-level
> API to a C runtime. If the outer and the inner python runtimes are
> the same, there is certainly a way to pass the necessary information through
> (i.e. ultimately just preserve the exception state from the callback).

  If you know how to do it, I take patches. I don't know how to do it in
the general case, i.e. without changing all C APIs to have an extra argument
to carry those informations. And changing the public C APIs is not possible.
Again I take patches !

Daniel

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