Added protocol flags (which ones can send, and which can receive).

1 files changed, 8 insertions, 0 deletions

diff --git a/src/core/protocol.h b/src/core/protocol.h
index 11c4c304..82ebd88f 100644
--- a/src/core/protocol.h
+++ b/src/core/protocol.h
@@ -92,10 +92,18 @@ struct nni_proto {
 	uint16_t			proto_self;     // our 16-bit D
 	uint16_t			proto_peer;     // who we peer with (ID)
 	const char *			proto_name;     // Our name
+	uint16_t			proto_flags;	// Protocol flags
 	const nni_proto_sock_ops *	proto_sock_ops; // Per-socket opeations
 	const nni_proto_pipe_ops *	proto_pipe_ops; // Per-pipe operations.
 };
 
+// These flags determine which operations make sense.  We use them so that
+// we can reject attempts to create notification fds for operations that make
+// no sense.
+#define	NNI_PROTO_FLAG_RECV	1	// Protocol can receive
+#define	NNI_PROTO_FLAG_SEND	2	// Protocol can send
+#define	NNI_PROTO_FLAG_SENDRECV	3	// Protocol can both send & recv
+
 // These functions are not used by protocols, but rather by the socket
 // core implementation. The lookups can be used by transports as well.
 extern nni_proto *nni_proto_find(uint16_t);