[issue32859] os.dup2() tests dup3() availability on each call

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset 16de2a9b8697cf90840eb217fb079f9c4c73e588 by Benjamin Peterson 
(Miss Islington (bot)) in branch '3.6':
closes bpo-32859: Don't retry dup3() if it is not available at runtime (GH-5708)
https://github.com/python/cpython/commit/16de2a9b8697cf90840eb217fb079f9c4c73e588


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[issue32859] os.dup2() tests dup3() availability on each call

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset bab4fe320ad2e24c1084fd57d2059ef342688aa9 by Benjamin Peterson 
(Miss Islington (bot)) in branch '3.7':
closes bpo-32859: Don't retry dup3() if it is not available at runtime (GH-5708)
https://github.com/python/cpython/commit/bab4fe320ad2e24c1084fd57d2059ef342688aa9


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[issue32859] os.dup2() tests dup3() availability on each call

[miss-islington]

Change by miss-islington :


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pull_requests: +5548

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[issue32859] os.dup2() tests dup3() availability on each call

[miss-islington]

Change by miss-islington :


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pull_requests: +5547

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[issue32859] os.dup2() tests dup3() availability on each call

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset b3caf388a0418f6c031e4dbdcc0c1ce7e5cc36bd by Benjamin Peterson 
(Alexey Izbyshev) in branch 'master':
closes bpo-32859: Don't retry dup3() if it is not available at runtime (GH-5708)
https://github.com/python/cpython/commit/b3caf388a0418f6c031e4dbdcc0c1ce7e5cc36bd


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue32859] os.dup2() tests dup3() availability on each call

[Alexey Izbyshev]

Change by Alexey Izbyshev :


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keywords: +patch
pull_requests: +5497
stage:  -> patch review

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[issue32859] os.dup2() tests dup3() availability on each call

[Alexey Izbyshev]

New submission from Alexey Izbyshev :

os.dup2() tests for dup3() system call availability at runtime, but doesn't 
remember the result across calls, repeating the test on each call with 
inheritable=False even if the test fails.

Judging by the code, 'dup3_works' was intended to be static (the first time its 
value is checked it's always an initial one).

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components: Extension Modules, Library (Lib)
messages: 312256
nosy: benjamin.peterson, izbyshev, vstinner
priority: normal
severity: normal
status: open
title: os.dup2() tests dup3() availability on each call
type: performance
versions: Python 3.6, Python 3.7

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