diff --git a/include/ucore/iomux.h b/include/ucore/iomux.h
index 1d60fe0..ad78687 100644
--- a/include/ucore/iomux.h
+++ b/include/ucore/iomux.h
@@ -110,34 +110,30 @@ int iomux_unregister_fd(struct IOMux *mux, struct IOMuxFD *fd);
  */
 int iomux_update_events(struct IOMux *mux, struct IOMuxFD *fd);
 
-/** Retreive the UCoreClock associated with the IOMux.
- * Either a suitable internal clock is provided, or the
- * same clock as created by iomux_create_ex.
- */
-struct UCoreClock *iomux_get_clock(struct IOMux *mux);
+
 /**
  * Convenience macro for setting the new event
  */
-#define iomux_set_event(mux, fd, what)\
+#define iomux_set_event(mux, fd, what_)\
 ({\
-    (fd)->what = (what);\
+    (fd)->what = (what_);\
     iomux_update_events((mux), (fd));\
 })
 
 /**
  * Convenience macro for clearing the new event
  */
-#define iomux_clear_event(mux, fd, what)\
+#define iomux_clear_event(mux, fd, what_)\
 ({\
-    (fd)->what &= ~(what);\
+    (fd)->what &= ~(what_);\
     iomux_update_events((mux), (fd));\
 })
 /**
  * Convenience macro for adding the new event to the existing events
  */
-#define iomux_add_event(mux, fd, what)\
+#define iomux_add_event(mux, fd, what_)\
 ({\
-    (fd)->what &= (what);\
+    (fd)->what &= (what_);\
     iomux_update_events((mux), (fd));\
 })