[issue1798] Add ctypes calling convention that allows safe access of errno

[Thomas Heller]

Thomas Heller <theller at ctypes.org> added the comment:

> How can Python run arbitrary code between the return from a ctypes
> method and the next Python instruction? None of the code should have any
> effect on errno.

By freeing objects because their refcount has reached zero?

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<http://bugs.python.org/issue1798>
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