[issue34780] Hang on startup if stdin refers to a pipe with an outstanding concurrent operation on Windows

Change by Zachary Ware : -- versions: +Python 3.9 -Python 2.7, Python 3.6 ___ Python tracker ___ ___ Python-bugs-list mailing list

[issue34780] Hang on startup if stdin refers to a pipe with an outstanding concurrent operation on Windows

Alexey Izbyshev added the comment: Ping! Thanks to @eryksun for providing feedback here and for the patch review. -- ___ Python tracker ___

[issue34780] Hang on startup if stdin refers to a pipe with an outstanding concurrent operation on Windows

Eryk Sun added the comment: > lseek() succeeds on pipes on Windows, but is nearly useless lseek isn't meaningful for pipe and character files (i.e. FILE_TYPE_PIPE and FILE_TYPE_CHAR). While SEEK_SET and SEEK_CUR operations trivially succeed in these cases, the underlying device simply

[issue34780] Hang on startup if stdin refers to a pipe with an outstanding concurrent operation on Windows

Change by Alexey Izbyshev : -- keywords: +patch pull_requests: +8924 stage: -> patch review ___ Python tracker ___ ___

[issue34780] Hang on startup if stdin refers to a pipe with an outstanding concurrent operation on Windows

New submission from Alexey Izbyshev : In the following code inspired by a production issue I had to debug recently subprocess.call() won't return: import os import subprocess import sys import time r, w = os.pipe() p1 = subprocess.Popen([sys.executable, '-c', 'import