[issue38435] Start the deprecation cycle for subprocess preexec_fn

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

With task specific arguments.  cwd, start_new_session, group, extra_groups,
user, etc..

We cannot provide a general do everything replacement and should not try.
It not possible.

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<https://bugs.python.org/issue38435>
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