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Date: Thu, 20 Feb 2003 20:17:49 -0800 (PST)
Message-Id: <20030220.201749.75380162.davem@redhat.com>
To: neilb@cse.unsw.edu.au
Cc: ak@suse.de, linux-kernel@vger.kernel.org, aeb@cwi.nl
Subject: Re: sendmsg and IP_PKTINFO
From: "David S. Miller" <davem@redhat.com>
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   From: Neil Brown <neilb@cse.unsw.edu.au>
   Date: Fri, 21 Feb 2003 14:51:07 +1100
   
   As far as I can tell, control message are currently defined for:
      IPv4,
      IPv6,
      SOL_HCI - some bluetooth thing
      SOL_SOCKET (which don't seem to be clearly documented in socket(7))
   
Also, control messages are used for AF_UNIX to pass file descriptors
around.