[issue38435] Start the deprecation cycle for subprocess preexec_fn

[Mark Mentovai]

Mark Mentovai <mark at moxienet.com> added the comment:

Another use case for preexec_fn: establishing a new controlling terminal, typically in conjunction with start_new_session=True. A preexec_fn may do something like

    os.close(os.open(os.ttyname(sys.stdin.fileno(), os.O_RDWR)))

with discussion at https://chromium-review.googlesource.com/c/chromium/src/+/3524204/comments/59f03e7c_f103cd7e.

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nosy: +markmentovai

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