[issue6394] getppid support in os module on Windows

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I'm currently working on it.  I'll certainly commit it shortly with a few changes:
- no need to say that a function fails with WindowsError, at least in the docstring.
- return error sooner to reduce indentation.
- in tests, use subprocess instead of multiprocessing.
- other minor formatting nits.

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<http://bugs.python.org/issue6394>
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