Using recvmsg() with non-unicast datagram (UDP) socket: inconsistent results

Corinna Vinschen
Wed Aug 1 19:25:00 GMT 2012

On Aug  1 14:35, Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
> > I applied a patch which should fix this problem.  It always uses
> > WSARecvMsg now, if called from recvmsg, still provided it is possible,
> > of course (No SOCK_STREAM, no AF_LOCAL).
> > 
> > I'm just generating a new developer snapshot.  Please give the today's
> > snapshot from a try.  Should be up in
> > about
> > half an hour.
> The patched DLL now returns consistent msg_flags regardless of whether
> or not the control message has been requested.  Thanks!
> Could I ask for another favor that since the native WSA msg_flags get
> propagated to the CYGWIN environment, the definitions for the additional
> flag bits, MSG_MCAST and MSG_BCAST (as defined by WSA) to be added to
> <cygwin/socket.h> please?

Done.  These are Windows-specific values not docuemnted by POSIX.
But Linux defines its own return values as well, so, never mind.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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