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In the resize method under win32 you have something
like this:
	/* Move to the desired EOF position */
 SetFilePointer (self->file_handle,
 new_size, NULL, FILE_BEGIN);
 /* Change the size of the file */
 SetEndOfFile (self->file_handle);
Which resizes the file
Under Unix you need to call 
 ftruncate(self->fileno, new_size)
before calling remap() to make it do the same thing.

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Would you like to contribute a patch? Please make sure to
include changes to the documentation and test suite.

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Please, could you verify if this problem persists in Python 2.3.4
or 2.4?
If yes, in which version? Can you provide a test case?
If the problem is solved, from which version?
Note that if you fail to answer in one month, I'll close this bug
as "Won't fix".
Thank you! 
. Facundo

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Deprecated. Reopen only if still happens in 2.3 or newer. 
. Facundo

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The problem still persists in Python 2.3 and 2.4. A quick
read of mmapmodule.c shows that ftruncate() is not being
called within the non-windows portion of mmap_resize_method().

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Reopened as posted that still is a bug.

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This is not trivial since the filehandle can be closed at
the time the ftruncate() would be necessary.
The Windows specific code duplicates the filehandle upon
mmap creation, perhaps the UNIX code should do this too?
Then, the ftruncate call can be inserted.

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Attaching patch which duplicates the file handle under UNIX
too (btw, the size() method was broken too), mimics Windows
behaviour with resize(), adds a testcase for this and
clarifies the docs.

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Okay, committed as
Modules/mmapmodule.c; 2.50; 2.48.4.1
Lib/test/test_mmap.py; 1.33; 1.30.18.1
Doc/lib/libmmap.tex; 1.12; 1.9.4.2