[issue38435] Start the deprecation cycle for subprocess preexec_fn

[Mark Diekhans]

Mark Diekhans <markd at kermodei.com> added the comment:

calling setpgid() is a common post-fork task that would need to be an explicit parameter to Popen when preexec_fn goes away

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nosy: +diekhans

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38435>
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