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Traditionally the functions in os are thin wrappers around OS functions, this patch changes that for os.fsync.
Two nits wrt. the patch itself:
1) The behaviour on OSX should be documented in the stdlib reference,
 that currently says that os.fsync will call the C function fsync
2) The comment in the __APPLE__ case can be clearer, and should 
 explain the issue (as short as possible).
I'm -1 on merging this patch though, as the fsync function on OSX behaves just like the one on Linux, the fnctl option adds a stronger guarantee in that it forces a flush of the buffers on the storage device as well. The manpage for fsync on a linux host says:
 In case the hard disk has write cache enabled, the data may not really be on permanent storage when fsync/fdatasync return.
Adding the F_FULLSYNC option to os.fsync would be fine though (if it isn't already implemented)
The linux