Patch: FYI: fix mmap bug in natFileChannelImplPosix.cc

[Andrew Haley]

Tom Tromey writes:
 > I'm checking this in on the trunk and the RH 4.1 branch.
 > 
 > This fixes a bug in how we mmap() files for use in MappedByteBufferImpl.
 > The bug is that if we are mapping for write, and the file is shorter
 > than the requested length, then we must make the file the desired
 > length, or else the mapped segment won't be long enough.
 > 
 > This fixes a bug found by the Animal Shelter Manager program (actually
 > by the underlying database it uses, I think).

Ah, thank you.  This also fixes a bug I found in hsqldb startup.

For what it's worth, I'm not convinced that the spec really requires
such a change, but some apps do.

Andrew.

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