[issue23234] refactor subprocess: use new OSError exceptions, factorize stdin.write() code

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0c5ae257966f by Victor Stinner in branch 'default':
Closes #23234: Refactor subprocess
https://hg.python.org/cpython/rev/0c5ae257966f

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nosy: +python-dev
stage: patch review -> resolved

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