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This is needed to prevent samba3 and samba4 from using an ABI
incompatible system version of talloc
See ongoing discussion on the samba-technical mailing list
These changes follow from the discussions on samba-technical. The
changes are in several parts, and stem from the inherent ambiguity
that was in talloc_free() and talloc_steal() when the pointer that is
being changes has more than one parent, via references.
The changes are:
1) when you call talloc_free() on a pointer with more than one parent
the free will fail, and talloc will log an error to stderr like this:
ERROR: talloc_free with references at some/foo.c:123
reference at other/bar.c:201
reference at other/foobar.c:641
2) Similarly, when you call talloc_steal() on a pointer with more
than one parent, the steal will fail and talloc will log an error to
stderr like this:
ERROR: talloc_steal with references at some/foo.c:123
reference at other/bar.c:201
3) A new function talloc_reparent() has been added to change a parent
in a controlled fashion. You need to supply both the old parent and
the new parent. It handles the case whether either the old parent was
a normal parent or a reference
The use of stderr in the logging is ugly (and potentially dangerous),
and will be removed in a future patch. We'll need to add a debug
registration function to talloc.
The previous code caused memory leaks, and also caused situations
where talloc_free could be called on pointers with multiple parents
The new approach is to have two functions:
py_talloc_import : steals the pointer, so it becomes wholly owned by
the python object
py_talloc_reference: uses a reference, so it is owned by both python
and C
This is a first attempt at exporting symbols only for public functions
We also provide a rudimentary ABI checker that tries to check that
function signatures are not changed by mistake.
Given our use of macros this is not an API checker.
It's all based on talloc.h contents and the gcc -aux-info option
The problem is that talloc in the Samba tree now includes
talloc_get_type_abort(), which is not present on Fedora 10 or ubuntu's
talloc 1.2.0.
Andrew Bartlett
