report at bugs
Dec 3, 2009, 5:31 AM
Post #1 of 3
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[issue5985] Implement os.path.samefile and os.path.sameopenfile on Windows
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Erik Carstensen <sandberg [at] virtutech> added the comment:
> Once I considered this approach, but problems was that
> nFileIndexLow/High can change every time file handle is opened, so it's
> not unique. See remarks in following page.
> http://msdn.microsoft.com/en-us/library/aa363788%28VS.85%29.aspx
Actually, that page only says that file identities may vary over time,
and that it may happen during operations such as defragmentation.
However, I have been in contact with a customer who observed a file
system where the file index actually changed every time a file was
closed and re-opened, given that nobody else kept the file open
inbetween. This was on some kind of network mount, I wasn't told which
kind (and I couldn't reproduce it with samba).
This means that it's actually essential that you don't close the file
between the CreateFile calls (and yes, your patch does this correctly).
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