1 files changed, 13 insertions, 2 deletions
diff --git a/src/frontend.h b/src/frontend.h
index c0aa505..e95fa6d 100644
--- a/src/frontend.h
+++ b/src/frontend.h
@@ -8,13 +8,16 @@
 #include "options.h"
 #include "types.h"
 
-#include "lilv/lilv.h"
+#include <lilv/lilv.h>
 
 #include <stdbool.h>
+#include <stdint.h>
 
+// Interface that must be implemented by UIs
 JALV_BEGIN_DECLS
 
-// Interface that must be implemented by UIs
+/// Arbitrary return code for successful early exit (for --help and so on)
+#define JALV_EARLY_EXIT_STATUS (-431)
 
 /// Command-line arguments passed to an executable
 typedef struct {
@@ -54,6 +57,14 @@ jalv_frontend_open(Jalv* jalv);
 int
 jalv_frontend_close(Jalv* jalv);
 
+/// Called when a port event (control change or other message) is sent to the UI
+void
+jalv_frontend_port_event(Jalv*       jalv,
+                         uint32_t    port_index,
+                         uint32_t    buffer_size,
+                         uint32_t    protocol,
+                         const void* buffer);
+
 JALV_END_DECLS
 
 #endif // JALV_UI_H