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gh-141473: Fix subprocess.Popen.communicate to send input to stdin upon a subsequent post-timeout call (GH-141477)

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* gh-141473: Fix subprocess.Popen.communicate to send input to stdin
* Docs: Clarify that `input` is one time only on `communicate()`
* NEWS entry
* Add a regression test.

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Co-authored-by: Gregory P. Smith <greg@krypto.org>
This commit is contained in:
Artur Jamro 2025-11-29 03:04:52 +01:00 • committed by GitHub
parent d2d2e92110
commit 526d7a8bb4
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4 changed files with 42 additions and 2 deletions
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Lib/subprocess.py
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@ -2105,7 +2105,7 @@ def _communicate(self, input, endtime, orig_timeout):
input_view = memoryview(self._input)
with _PopenSelector() as selector:
if self.stdin and input:
if self.stdin and not self.stdin.closed and self._input:
selector.register(self.stdin, selectors.EVENT_WRITE)
if self.stdout and not self.stdout.closed:
selector.register(self.stdout, selectors.EVENT_READ)