Add accessor function to the uclock of an IOMux

include/ucore/iomux.h

@@ -110,7 +110,11 @@ 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
  */

src/iomux_impl.c

@@ -139,6 +139,11 @@ int iomux_update_events(struct IOMux *mux, struct IOMuxFD *fd)
     return mux->update_events_impl(mux, fd);
 }
 
+struct UCoreClock *iomux_get_clock(struct IOMux *mux)
+{
+    return mux->uclock;
+}
+
 struct UCTimers *iomux_get_timers(struct IOMux *mux)
 {
     return &mux->timers;