[3.9] bpo-40550: Fix time-of-check/time-of-action issue in subprocess.Popen.send_signal. (GH-20010) by miss-islington · Pull Request #23439

[3.9] bpo-40550: Fix time-of-check/time-of-action issue in subprocess.Popen.send_signal. (GH-20010) by miss-islington · Pull Request #23439 · python/cpython

….send_signal. (pythonGH-20010)

send_signal() now swallows the exception if the process it thought was still alive winds up not to exist anymore (always a plausible race condition despite the checks).

Co-authored-by: Gregory P. Smith <greg@krypto.org>
(cherry picked from commit 01a202a)

Co-authored-by: Filipe Laíns <lains@archlinux.org>