Date: Mon, 19 Jan 2004 20:44:34 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Subject: Re: Multihomed UDP server Message-ID: <Pine.BSF.4.53.0401192035030.94399@e0-0.zab2.int.zabbadoz.net> In-Reply-To: <98296.1074542746@critter.freebsd.dk> References: <98296.1074542746@critter.freebsd.dk>
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On Mon, 19 Jan 2004, Poul-Henning Kamp wrote:
> In message <200401192002.i0JK2SJZ058752@khavrinen.lcs.mit.edu>, Garrett Wollman
> writes:
> ><<On Mon, 19 Jan 2004 12:58:00 +0100, "Poul-Henning Kamp" <phk@phk.freebsd.dk> said:
> >
> >> I'm considering ways to make sendmsg(2)/recvmsg(2) DTRT, and my
> >> current candidate is give them a flag bit which says "msg_name has
> >> both addresses".
> >
> >Um, they already do the right thing. That's what the IP_RECVDESTADDR
actually it is IP_RECVDSTADDR (no E).
> >option (and its dual whose name I forget right now) is all about.
>
> Yeah, I found that out. Now, where on the earth is that documented ?
You mean for FreeBSD or in ISBN 0-13-490012-X ?
For FreeBSD it is man 4 ip:
--- cite ---
If the IP_RECVDSTADDR option is enabled on a SOCK_DGRAM socket, the
recvmsg(2) call will return the destination IP address for a UDP data-
gram. The msg_control field in the msghdr structure points to a buffer
that contains a cmsghdr structure followed by the IP address. The
cmsghdr fields have the following values:
--- cite ---
--
Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT
56 69 73 69 74 http://www.zabbadoz.net/
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