[issue32862] os.dup2(fd, fd, inheritable=False) behaves inconsistently

Change by STINNER Victor : -- nosy: -vstinner ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue32862] os.dup2(fd, fd, inheritable=False) behaves inconsistently

Change by Eryk Sun : -- versions: +Python 3.10, Python 3.8, Python 3.9 -Python 3.6, Python 3.7 ___ Python tracker ___ ___

[issue32862] os.dup2(fd, fd, inheritable=False) behaves inconsistently

Alexey Izbyshev added the comment: @eryksun: Thank you for the note! I've commented on #32865. This adds even more inconsistency to this corner case. -- ___ Python tracker

[issue32862] os.dup2(fd, fd, inheritable=False) behaves inconsistently

Eryk Sun added the comment: In Windows the CRT file descriptor is actually still inheritable. This only makes the underlying OS handle non-inheritable. I don't think there's a way to make an existing FD non-inheritable using public CRT functions. See issue 32865.

[issue32862] os.dup2(fd, fd, inheritable=False) behaves inconsistently

Change by Alexey Izbyshev : -- keywords: +patch pull_requests: +5503 stage: -> patch review ___ Python tracker ___

[issue32862] os.dup2(fd, fd, inheritable=False) behaves inconsistently

New submission from Alexey Izbyshev : os.dup2(fd, fd, inheritable=False) may fail or change fd inheritability in following ways: 1) POSIX without F_DUP2FD_CLOEXEC 1.1) dup3() is available (a common case for Linux): OSError (EINVAL, dup3() doesn't allow equal descriptors)