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[3.13] gh-142195: Fixed Popen.communicate indefinite loops (GH-143203) (#143256)

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gh-142195: Fixed Popen.communicate indefinite loops (GH-143203)

Changed condition to evaluate if timeout is less than or equals to 0. This is needed for simulated time environments such as Shadow where the time will match exactly on the boundary.

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(cherry picked from commit fa9a4254e8)

Co-authored-by: Prithviraj Chaudhuri <p.chaudhuri1993@gmail.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
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Miss Islington (bot) 2025-12-28 18:20:40 +01:00 • committed by GitHub
parent 750c3efe82
commit 8cfe1ab887
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2 changed files with 2 additions and 1 deletions
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2
Lib/subprocess.py
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@ -2143,7 +2143,7 @@ def _communicate(self, input, endtime, orig_timeout):
while selector.get_map():
timeout = self._remaining_time(endtime)
if timeout is not None and timeout < 0:
if timeout is not None and timeout <= 0:
self._check_timeout(endtime, orig_timeout,
stdout, stderr,
skip_check_and_raise=True)

1
Misc/NEWS.d/next/Library/2025-12-27-00-14-56.gh-issue-142195.UgBEo5.rst Normal file
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@ -0,0 +1 @@
Updated timeout evaluation logic in :mod:`subprocess` to be compatible with deterministic environments like Shadow where time moves exactly as requested.