[Bug 255625] fdescfs open with O_DIRECTORY fails with ENOTDIR

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255625

            Bug ID: 255625
           Summary: fdescfs open with O_DIRECTORY fails with ENOTDIR
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: walker.aj325 at gmail.com

>> os.open("/mnt/dozer", os.O_DIRECTORY)
3
>>> os.open("/dev/fd/3", os.O_DIRECTORY)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NotADirectoryError: [Errno 20] Not a directory: '/dev/fd/3'
Manpage states:
     Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR are
     ignored.
Ideally, it would be nice to have O_DIRECTORY support.

The reason for this preference is that there are various places where Samba
needs to be able to convert descriptors opened with O_PATH to regular opens,
and it perform these opens with O_DIRECTORY if it is expected to be a
directory.

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