Add a way of printing a C backtrace to faulthandler

[jakkdl]

Feature or enhancement

Proposal:

The faulthandler module allows registering a SIGSEGV handler to print a Python stacktrace if the program encounters a segfault. However, if developing C/C++ extension modules that may not be particularly useful on its own, and you also want the the C stacktrace.
The suggested API would be a kwarg to faulthandler.enable().

Implementation could use https://github.com/timmaxw/cfaulthandler as a starting point, timmaxw/cfaulthandler@561dbdd in particular.

The availability/usability of the feature would likely depend on platform and/or compile flags.

Has this already been discussed elsewhere?

I have already discussed this feature proposal on Discourse

Links to previous discussion of this feature:

https://discuss.python.org/t/print-c-stacktrace-with-faulthandler/56834
where @gpshead approved of opening a feature request

Linked PRs

• gh-127604: Add C stack dumps to faulthandler #128159

[ZeroIntensity]

Would you like to submit the starting PR?

[jakkdl]

Would you like to submit the starting PR?

I might give it a try, but if anybody else wants to you're super welcome. I'm not especially well versed with faulthandler myself.

[ZeroIntensity]

I went ahead and tried this myself: #128159