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On Mar 23 10:08, Ken Brown wrote:On 3/23/2011 9:26 AM, Corinna Vinschen wrote:Btw., I just experimented with another flag which has not been exposed to the Win32 API, and which is not officially documented. It's called AT_EXTENDABLE_FILE and allows to specify a view which is bigger than the filesize. I tried this on W7-64, and it works. Just not exactly as we need it. The trailing pages are not commited but only reserved, so accessing them still results in a SEGV. And while commiting them allows to run the autoconf testcase, it also changes the filesize of the file on disk. Oh well.
Is the scenario in which the autoconf test fails likely to occur in practice? I wonder if it could be responsible for some of the mysterious crashes that people have reported on 64-bit systems.
Usually it shouldn't. While you can write into a mmaped area beyond EOF up to the end of the last page, it doesn't make a lot of sense. The data will never show up in the mapped file.
I have no idea if there are applications out there which rely on this crude behaviour.
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