Mark Mentovai <m...@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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<https://bugs.python.org/issue38435>
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