Re: [xml] stylesheet imports and memory management

(Sent to list, CC'd for convenience)

I've been planning (sorry...) to submit a patch to the libxml2
documentation to note that the call xsltParseStylesheetDoc takes
ownership of the document that is passed to it (i.e., guarantees to
release it appropriately), so that code using this function must not
free the document.  Indeed, the document may be modified as a result of
passing it to xsltParseStylesheetDoc.

I'm guessing it's quite possible that the Python wrapper calls this
function and therefore has the same problems as our in-house C++
wrappers did before I changed them to relinquish ownership when calling

-- James

-----Original Message-----
From: xml-bounces gnome org [mailto:xml-bounces gnome org] On Behalf
Nic James Ferrier
Sent: Tuesday, January 09, 2007 3:52 PM
To: libxml
Subject: [xml] stylesheet imports and memory management

I've got a problem with the memory management of libxslt with some
python code.

I've got xslts in python doing imports through a (python) loader

The loader function uses either:




to read in the resource for the import.

My loader function implementation records the relevant document
objects so they can be freed later. This is my understanding of what
the function has to do.

Later on, after the result of the transformation has been finished
with, I free the documents that were created by the XSLT imports.

Directly afterwards I free the stylesheet and I get a glibc double
free error.

It looks like libxslt is trying to free any documents is has got from
the loader function implementation.

Is this correct? It seems to run contrary to the documentation.

Nic Ferrier   for all your tapsell ferrier needs
xml mailing list, project page
xml gnome org

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