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. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
