socket-util: Avoid using sendmsg on Windows

Sendmsg is not used under Windows.

While it does have a sort of equivalent called `WSASendMsg`
(https://msdn.microsoft.com/en-us/library/windows/desktop/ms741692(v=vs.85).aspx)
it uses a different structure `WSAMSG` instead of the normal msghdr which
in turn will have to be mapped properly (this goes further to iovec/wsabuf in the
structure itself).

Fixes broken build on Windows.

Signed-off-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Shashank Ram <rams@vmware.com>

diff --git a/lib/socket-util.c b/lib/socket-util.c
index 7148ae3da67c6fcbac48b27767eac639f5202955..de7df6745dfd3c229f29b0f548c7ca9910260dd1 100644 (file)
--- a/lib/socket-util.c
+++ b/lib/socket-util.c
@@ -1021,6 +1021,7 @@ sock_strerror(int error)
 #endif
 }
 \f
+#ifndef _WIN32 //Avoid using sendmsg on Windows entirely
 static int
 emulate_sendmmsg(int fd, struct mmsghdr *msgs, unsigned int n,
                  unsigned int flags)
@@ -1058,3 +1059,4 @@ wrap_sendmmsg(int fd, struct mmsghdr *msgs, unsigned int n, unsigned int flags)
     return emulate_sendmmsg(fd, msgs, n, flags);
 }
 #endif
+#endif