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[3.14] gh-135335: flush stdout/stderr in forkserver after preloading modules (GH-135338) #135670

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Merged
merged 1 commit into from
Jun 18, 2025

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@miss-islington miss-islington commented Jun 18, 2025

If a preloaded module writes to stdout or stderr, and the stream is buffered,
child processes will inherit the buffered data after forking. Attempt to
prevent this by flushing the streams after preload.
(cherry picked from commit 9877d19)

Co-authored-by: Duane Griffin duaneg@dghda.com
Co-authored-by: Mikhail Efimov efimov.mikhail@gmail.com
Co-authored-by: Victor Stinner vstinner@python.org

…odules (pythonGH-135338)

If a preloaded module writes to stdout or stderr, and the stream is buffered,
child processes will inherit the buffered data after forking. Attempt to
prevent this by flushing the streams after preload.
(cherry picked from commit 9877d19)

Co-authored-by: Duane Griffin <duaneg@dghda.com>
Co-authored-by: Mikhail Efimov <efimov.mikhail@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
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3 participants