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unexpected behavior of tempfile.TemporaryFile() for O_TMPFILE #96531

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stdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error
@zhangyoufu

Description

@zhangyoufu

Bug report

WhenO_TMPFILE is available:

  1. tempfile.TemporaryFile(mode='wb') opens withO_RDWR instead ofO_WRONLY, theopener callback ignoresmode argument and always use_bin_openflags
  2. _bin_openflags has bothO_CREAT andO_EXCL set, theopener callback removesO_CREAT from flags but leaveO_EXCL, this is an undefined behavior according to Linuxopen(2) manpage

Your environment

  • CPython versions tested on: 3.10
  • Operating system and architecture: Linux x86_64

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    stdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error

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