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Date:      Sat, 19 Jan 2008 15:42:41 +0000 (GMT)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Alfred Perlstein <alfred@freebsd.org>
Cc:        freebsd-current@FreeBSD.org, Jung-uk Kim <jkim@FreeBSD.org>, freebsd-arch@FreeBSD.org
Subject:   Re: [RFC] SysV SHM on 64-bit platforms
Message-ID:  <20080119154147.E91115@fledge.watson.org>
In-Reply-To: <20080119122657.GN99258@elvis.mu.org>
References:  <200801181217.52788.jkim@FreeBSD.org> <20080119122657.GN99258@elvis.mu.org>

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On Sat, 19 Jan 2008, Alfred Perlstein wrote:

>> FYI, fixing ipc_perm is a lot more complicated and very intrusive.
>
> Why does ipc_perm need fixing?

It is desparately broken due to using 16-bit types for uids and gids.  Fixing 
it really tears up the ABI, unfortunately, and requires quite a bit of compat 
code writing.  When there, there are some other types in ipc_perm that would 
also like to be fixed.

Robert N M Watson
Computer Laboratory
University of Cambridge



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