[issue9569] Add tests for posix.mknod() and posix.mkfifo()

[David Watson]

David Watson <baikie at users.sourceforge.net> added the comment:

OK, these patches work on FreeBSD 5.3 (root and non-root) if you want to check the errno.  I don't know what other systems might return though.  I did also find that the 2.x tests were failing on cleanup because the test class used os.unlink rather than support.unlink (which ignores missing files) as its 3.x counterpart does, so I've updated the patch to change that as well.

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Added file: http://bugs.python.org/file18489/test-mknod-mkfifo-2.x-2.diff

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