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To: "Dirk Bull" <dirkbull102@hotmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: shmat problem
References: <F175L4BapMJJGizFJ0q0002fff7@hotmail.com>
From: Doug McNaught <doug@mcnaught.org>
Date: 06 Jan 2003 09:17:52 -0500
In-Reply-To: "Dirk Bull"'s message of "Mon, 06 Jan 2003 09:05:37 +0000"
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"Dirk Bull" <dirkbull102@hotmail.com> writes:

> I have a problem with the shmat() function. It works correctly when
> one doesn't specify an address where the segment should be attached,
> but fails when one does. To specify an address it must be alligned
> and I did by using  __attribute__ (aligned()). Still the function
> fails. What is the most effective way for a solution
> to this problem.

__attribute__(aligned()) has nothing to do with it--the address needs
to be page-aligned (ie on a multiple of 4K for ix86), unless SHM_RND
is set in the call.  You also need to make sure nothing else is mapped
at the address you're trying to use...

-Doug
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