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

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> 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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