with tempfile.TemporaryFile('w', dir=dir) as tmp:
                # the flag can become False on Linux <= 3.11
                if not tempfile._O_TMPFILE_WORKS:
                    self.skipTest("O_TMPFILE doesn't work")

            except OSError:
                # The filesystem of the directory does not support O_TMPFILE.
                # For example, OSError(95, 'Operation not supported').
                #
                # On Linux kernel older than 3.11, trying to open a regular
                # file (or a symbolic link to a regular file) with O_TMPFILE
                # fails with NotADirectoryError, because O_TMPFILE is read as
                # O_DIRECTORY.
                pass
            # Fallback to _mkstemp_inner().

import os, tempfile
dir = '.'
flags = os.O_RDWR | os.O_CREAT | os.O_EXCL
fd, name = tempfile._mkstemp_inner(dir, "tmp", "", flags, str)
os.unlink(name)
try:
    os.link(f'/proc/self/fd/{fd}', 'link', follow_symlinks=True)
finally:
    os.close(fd)