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Message-ID: <3753E0FF.18088603@vinschen.de>
Date: Tue, 01 Jun 1999 15:32:47 +0200
From: Corinna Vinschen <corinna AT vinschen DOT de>
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To: Horak Daniel <horak AT mmp DOT plzen-city DOT cz>
CC: "'Suhaib M. Siddiqi'" <Ssiddiqi AT InspirePharm DOT Com>,
        cygwin AT sourceware DOT cygnus DOT com, cygwin-xfree AT sourceware DOT cygnus DOT com
Subject: Re: shm
References: <2E7F82FAC1FCD2118E1500A024B3BF907DECD5 AT exchange DOT mmp DOT plzen-city DOT cz>
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Horak Daniel wrote:
> 
> > Has anyone a SVR4 style shared memmory for Cygwin
> > (shmget/shmctl/shmat)?  I need it for X-server
> > for Cygwin Development.
> >
> > The ipc available for Cygwin from France (do not remember the URL) has
> > problems.  Its headers gives the problems.
> 
> I am using the cygipc library v1.03
> (http://www.multione.capgemini.fr/tools/pack_ipc/) succesfully in the port
> of PostgreSQL database system. It required only to comment CURRENT_TIME in
> some header.
> 
>                         Dan

Caution!

The security settings of this package are not sufficent for multi user
systems! The security descriptor, that is given to `CreateSemaphore'
is a default descriptor. The result is, that only the creator/owner
of the semaphore may use it.

Moreover, the cygwin call `mmap' which is used in the package, is not
implemented with sufficent correspondence between the given permissions
and the resulting security descriptor in the windows call
`CreateFileMapping'. It uses the default descriptor, too :(

Regards,
Corinna

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