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-rw-r--r--bindings/c/zmq.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/bindings/c/zmq.h b/bindings/c/zmq.h
index 9b11a1d..a65926e 100644
--- a/bindings/c/zmq.h
+++ b/bindings/c/zmq.h
@@ -188,6 +188,12 @@ ZMQ_EXPORT int zmq_term (void *context);
// the peer that issued the last received request.
#define ZMQ_REP 4
+// Socket to receive messages from up the stream.
+#define ZMQ_UPSTREAM 5
+
+// Socket to send messages downstream.
+#define ZMQ_DOWNSTREAM 6
+
// Open a socket. 'type' is one of the socket types defined above.
//
// Errors: EINVAL - invalid socket type.