diff --git a/include/proto/stream_interface.h b/include/proto/stream_interface.h
index a6f6d33..7f54324 100644
--- a/include/proto/stream_interface.h
+++ b/include/proto/stream_interface.h
@@ -236,6 +236,46 @@
 		appctx->applet->release(appctx);
 }
 
+/* let an applet indicate that it wants to put some data into the input buffer */
+static inline void si_applet_want_put(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_PUT;
+}
+
+/* let an applet indicate that it wanted to put some data into the input buffer
+ * but it couldn't.
+ */
+static inline void si_applet_cant_put(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_PUT | SI_FL_WAIT_ROOM;
+}
+
+/* let an applet indicate that it doesn't want to put data into the input buffer */
+static inline void si_applet_stop_put(struct stream_interface *si)
+{
+	si->flags &= ~SI_FL_WANT_PUT;
+}
+
+/* let an applet indicate that it wants to get some data from the output buffer */
+static inline void si_applet_want_get(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_GET;
+}
+
+/* let an applet indicate that it wanted to get some data from the output buffer
+ * but it couldn't.
+ */
+static inline void si_applet_cant_get(struct stream_interface *si)
+{
+	si->flags |= SI_FL_WANT_GET | SI_FL_WAIT_DATA;
+}
+
+/* let an applet indicate that it doesn't want to get data from the input buffer */
+static inline void si_applet_stop_get(struct stream_interface *si)
+{
+	si->flags &= ~SI_FL_WANT_GET;
+}
+
 /* Try to allocate a new connection and assign it to the interface. If
  * a connection was previously allocated and the <reuse> flag is set,
  * it is returned unmodified. Otherwise it is reset.