--- Gnu-Mach/i386/i386at/kd_queue.h	2020/09/02 04:36:58	1.1
+++ Gnu-Mach/i386/i386at/kd_queue.h	2020/09/02 04:49:22	1.1.1.3
@@ -64,6 +64,9 @@ WITH THE USE OR PERFORMANCE OF THIS SOFT
  * /dev/mouse.
  */
 
+#ifndef _KD_QUEUE_H_
+#define _KD_QUEUE_H_
+
 #include <mach/std_types.h>
 #include <i386at/kd.h>
 
@@ -74,6 +77,10 @@ typedef struct {
 	int firstfree, firstout;
 } kd_event_queue;
 
-extern void kdq_put(), kdq_reset();
-extern boolean_t kdq_empty(), kdq_full();
-extern kd_event *kdq_get();
+extern void kdq_put(kd_event_queue *, kd_event *);
+extern void kdq_reset(kd_event_queue *);
+extern boolean_t kdq_empty(const kd_event_queue *);
+extern boolean_t kdq_full(const kd_event_queue *);
+extern kd_event *kdq_get(kd_event_queue *);
+
+#endif /* _KD_QUEUE_H_ */