Feature or enhancement

Proposal:

Thefaulthandler module allows registering aSIGSEGV 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 tofaulthandler.enable().

Implementation could usehttps://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 tofaulthandler #128159
• gh-127604: Don't rely ondprintf() for faulthandler C stacks #132800
• gh-127604: Fix refleak in faulthandler_dump_c_stack_py() #132840
• gh-127604: Allow faulthandler to dumpC stack on MacOS #132841
• gh-127604: Replace dprintf() with _Py_write_noraise() #132854
• gh-127604: Only define dump_pointer() if CAN_C_BACKTRACE #132897
• gh-127604: ensure-ldl is passed to the linker whendladdr1 is found #133040
• gh-127604: ensure-ldl is passed only once to the linker #133071
• gh-127604: Optimize -ldl usage on platforms that use dlopen for libFFI. #133081
• gh-127604: Docs: Include a C stack in thefaulthandler example #136081
• [3.14] gh-127604: Docs: Include a C stack in thefaulthandler example (GH-136081) #136102