[issue38435] Start the deprecation cycle for subprocess preexec_fn

[Gregory P. Smith]

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

signal.signal use case:

Calls to signal.signal(x, y) to sometimes to set a non SIG_DFL behavior on a signal.  SIGINT -> SIG_IGN for example.

I see a lot of legacy looking code calling signal.signal in prexec_fn that appears to set SIG_DFL for the signals that Python otherwise modifies.  Which restore_signals=True should already be doing.

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