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Date:	Thu, 17 Aug 2006 11:29:19 -0500
From:	Brian Ford <Brian DOT Ford AT FlightSafety DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Cygwin 1.5.18: Problem using setsockopt() for multicast
In-Reply-To:	<20060817142909.GI20467@calimero.vinschen.de>
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On Thu, 17 Aug 2006, Corinna Vinschen wrote:

> On Aug 17 09:06, Brian Ford wrote:
> > Oh yeah, you must call the setsockopt below after the bind on windows.
> > Search MSDN for why.
>
> P.S.: Do you know the MSDN articel off-hand, maybe?

http://support.microsoft.com/default.aspx?scid=kb;en-us;131978

Excerpt:

For example:

        #define RECV_IP_ADDR   "225.6.7.8"  // arbitrary multicast address

        mreq.imr_multiaddr.s_addr = inet_addr(RECV_IP_ADDR);
        mreq.imr_interface.s_addr = INADDR_ANY;
        err = setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
                        (char*)&mreq, sizeof(mreq))


Note that it is necessary to bind to an address before calling the
setsockopt() function.

-- 
Brian Ford
Lead Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained crew...

.


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