ci(cunit): set generic argument and return types

[P403n1x87]

Description of the Change

Depending on how Python is compiled on certain architectures, not giving types to C functions using ctypes can lead to mangled values (e.g. a 64-bit pointer having its top 32 bits set to 1). This is a highly likely source of segmentation faults, and they were discovered using the Python builds from the setup-python action.

With this change, we ensure that all arguments and return values get a default type. We use c_void_p for any pointer and c_long for any non-pointer argument/return value, to ensure that the passed bits are not altered by unwanted conversions.

Alternate Designs

N. A.

Regressions

N. A.

Verification Process

Existing test suite.

[codecov]

Codecov Report

Base: 69.16% // Head: 69.75% // Increases project coverage by +0.58% 🎉

Coverage data is based on head (0ff07a7) compared to base (3dc9961).
Patch has no changes to coverable lines.

❗ Current head 0ff07a7 differs from pull request most recent head 72d12d8. Consider uploading reports for the commit 72d12d8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #125      +/-   ##
==========================================
+ Coverage   69.16%   69.75%   +0.58%     
==========================================
  Files          23       23              
  Lines        2384     2394      +10     
  Branches      696      697       +1     
==========================================
+ Hits         1649     1670      +21     
+ Misses        416      405      -11     
  Partials      319      319              

Impacted Files	Coverage Δ
src/logging.c	73.46% <0.00%> (-8.54%)	⬇️
src/py_proc_list.c	75.57% <0.00%> (-2.30%)	⬇️
src/stack.h	83.57% <0.00%> (+0.71%)	⬆️
src/py_thread.c	73.33% <0.00%> (+1.93%)	⬆️
src/py_proc.c	63.35% <0.00%> (+2.43%)	⬆️
src/py_string.h	69.23% <0.00%> (+2.56%)	⬆️

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[P403n1x87]

Closing because it doesn't seem to actually work around actions/setup-python#442.

[P403n1x87]

@dsame I'm tagging you in case you'd be interested in the current solution, which is based on your valuable analysis 🙇 .