RTEMS | rmdir does not handle dot-dot as specified by POSIX (#5071)

[Loris Nardo (@loris.nardo)]

Loris Nardo commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5071#note_110096


This issue has been created because the testcase fstest/fsrmdirparent fails.

I've checked better what happens: in the testcase the `rmdir` fails with `EBUSY`, this is because in the testcase it is trying to remove the current working directory; however if I change the testcase to remove a different dot-dot folder, the testcase passes.

The different error is just because the condition for `EBUSY` is checked before. The dot-dot path is treated as valid and then fails inside `rmnod_h` with the correct error code.

If it is fine I can fix the testcase

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5071#note_110096
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