strange interaction between open and cwd

[Baz Walter]

On 04/05/10 09:08, Gregory Ewing wrote:
> Grant Edwards wrote:
>
>> except that Python objects can form a generalized graph, and Unix
>> filesystems are constrained to be a tree.
>
> Actually I believe that root is allowed to create arbitrary
> hard links to directories in Unix, so it's possible to turn
> the file system in to a general graph. It's highly
> unrecommended, though, because it confuses the heck out of
> programs that recursively traverse directories (which is
> why only root is allowed to do it).

i think there are versions of mac osx that use hard-linked directories 
in their backup systems.