[issue41443] some test cases in test_posix.py fail if some os attributes are not supported

[Peixing Xin]

New submission from Peixing Xin <peixing.xin at windriver.com>:

Some operating systems like VxWorks can't support posix.chown, posix.mknod and posix.readlink. This results that test_chown_dir_fd, test_mknod_dir_fd and test_readlink_dir_fd fail.

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components: Tests
messages: 374610
nosy: pxinwr
priority: normal
severity: normal
status: open
title: some test cases in test_posix.py fail if some os attributes are not supported
type: behavior
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41443>
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