[issue2733] mmap resize fails on anonymous memory (Windows)

[Hirokazu Yamamoto]

Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp> added the comment:

More two cents which I noticed. (After the patch was applied)

1. On windows, resize for anonymous map can clear its contents.

>>> import mmap
>>> m = mmap.mmap(-1, 10)
>>> m[:] = "0123456789"
>>> m[:]
'0123456789'
>>> m.resize(20)
>>> m[:]
'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0
0'

2. Anonymous map on unix also has similar problem. ftruncate() fails for
fd == -1

Sorry for having clear solution for this. But I cannot say "This is what
mmap.resize should behave!".

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2733>
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