> New changeset 66e4ef9a7467 by Victor Stinner in branch 'default':
> Issue #23648: Complete the list of modified functions for the PEP 475
> https://hg.python.org/cpython/rev/66e4ef9a7467
>
> +    * special cases: :func:`os.close` and :func:`os.dup2` now ignore
> +      :py:data:`~errno.EINTR` error, the syscall is not retried (see the PEP
> +      for the rationale)

But os.dup2 is not mentioned in PEP 475.