[issue11277] Crash with mmap and sparse files on Mac OS X

[Steffen Daode Nurpmeso]

Steffen Daode Nurpmeso <sdaoden at googlemail.com> added the comment:

@Nadeem: note that the committed versions of the tests would not
show up the Mac OS X mmap() bug AFAIK, because there is an
intermediate .close() of the file to be mmapped.  The OS X bug is
that the VMS/VFS interaction fails to provide a valid memory
region for <<pages which are not yet physically present on disc>>
- i.e. there is no true sparse file support as on Linux, which
simply uses references to a single COW zero page.
(I've not tried it out for real yet, but i'm foolish like a prowd
cock, so i've looked at the changeset :)

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<http://bugs.python.org/issue11277>
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