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Re: Cygwin 1.5.18: Problem using setsockopt() for multicast
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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