Re: mmap and MAP_FIXED

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Feb 25 16:18, Corinna Vinschen wrote:
> On Feb 25 06:35, Eric Blake wrote:
> > While you are at it, POSIX requires an update to underlying file's ctime
> > sometime between mmap(... MAP_SHARED, PROT_WRITE ...) and the
> > corresponding munmap() or msync() if the mapped region was written to.  If
> > Windows correctly updates mtime on a mapped file, then one possible way to
> > do this might be: when munmap()ing, if mtime is newer than ctime (but less
> > than or equal to now), adjust ctime to match mtime.
> 
> Well... no, not now. [...]

I'm sorry, but it looks like that won't work at all.  I've just tested how
the filetime behaves when changing the mapped area of a file mapped
MAP_SHARED.  Windows does change the file, but it does not change mtime.


Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          mailto:cygwin@cygwin.com
Red Hat, Inc.

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