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Subject: Re: cygserver shmat
From: bertrand marquis <bertrand DOT marquis AT sysgo DOT com>
To: cygwin <cygwin AT cygwin DOT com>
In-Reply-To: <20040812093246.GB24822@cygbert.vinschen.de>
References: <1092302630 DOT 4368 DOT 3 DOT camel AT bma DOT sysgo DOT com> <20040812093246 DOT GB24822 AT cygbert DOT vinschen DOT de>
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Date: 12 Aug 2004 12:13:47 +0200
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Le jeu 12/08/2004 à 11:32, Corinna Vinschen a écrit :
> On Aug 12 11:23, bertrand marquis wrote:
> > Hello,
> > 
> > 	i'm trying to use shmat specifying an address but each time i got the
> > error: "invalid argument".
> > in fact i need to map something just next to something previously mapped
> > without argument.
> > is this a limitation of cygserver ?
> 
> What address are you trying?  Keep in mind that the address must be
> a multiple of SHMLBA, except you're using the SHM_RND flag.  See
> http://www.opengroup.org/onlinepubs/009695399/functions/shmat.html
> 
> Corinna

In fact i wasn't using the SHM_RNd flag.

In details here is what i do:

- get a shared segment of with size= SIZE (SIZE multiple of SHMLBA)
- attach the segment without specifying address and storing the result
in beginaddress
- attach the segment again specifying the address: endposition=
beginaddress + SIZE

without SHM_RND in the second shmat i've got the error : invalid
argument

now that i specifie SHM_RND in the flag i have the error: value to large
for defined type ....

any idea ?

thanks

bertrand




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