[issue23285] PEP 475 - EINTR handling

[STINNER Victor]

STINNER Victor added the comment:

The change on Modules/_io/fileio.c is wrong: functions may return None with an exception set. It is wrong because a function must return a result with no exception set, or NULL and an exception set.

Attached patch fixes this issue.

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Added file: http://bugs.python.org/file38309/fileio.patch

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