sockets: check that the named file descriptor is a socket
The SocketAddress struct has an "fd" type, which references the name of a file descriptor passed over the monitor using the "getfd" command. We currently blindly assume the FD is a socket, which can lead to hard to diagnose errors later. This adds an explicit check that the FD is actually a socket to improve the error diagnosis. Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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