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Date: Tue, 1 Mar 2005 16:37:04 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: mmap and MAP_FIXED
Message-ID: <20050301153704.GZ18314@cygbert.vinschen.de>
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References: <421E60A0 DOT 8000102 AT stambulchik DOT net> <20050225120045 DOT GO18314 AT cygbert DOT vinschen DOT de> <421F2987 DOT 3090307 AT byu DOT net> <20050225151801 DOT GT18314 AT cygbert DOT vinschen DOT de>
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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

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

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