Print a traceback from an extension?

[Mark Hammond]

gb at cs.unc.edu wrote:
> Can I print a traceback from within a extension written in C? 
> 
> I know we're supposed to just keep returning NULL until we make it
> back to the main loop. That normally works fine. 
> 
> But I'm calling Python code from a callback that is called by C
> code. The Python code fails so PyEval_CallObject returns NULL. I want
> to provide a helpful message at that point.
> 
> Can this be done? If so, can someone suggest where to look for an
> example?
> 
> Thanks
> gb

You can find a function inside 
http://lxr.mozilla.org/seamonkey/source/extensions/python/xpcom/src/ErrorUtils.cpp 
that creates a traceback in your C/C++ code.

Mark.