[issue10812] Add some posix functions

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 8945e087a5a6 by Ross Lagerwall in branch 'default':
Issue #10812: Revert os.lseek change.
http://hg.python.org/cpython/rev/8945e087a5a6

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