Read local time immediately after select()

This removes a small inaccuracy caused by delay between select() and
file handler calls.

sched.h

@@ -60,6 +60,10 @@ extern void SCH_AddInputFileHandler
 );
 extern void SCH_RemoveInputFileHandler(int fd);
 
+/* Get the time (cooked) when file descriptor became ready, intended for use
+   in file handlers */
+extern void SCH_GetFileReadyTime(struct timeval *tv);
+
 /* This queues a timeout to elapse at a given (raw) local time */
 extern SCH_TimeoutID SCH_AddTimeout(struct timeval *tv, SCH_TimeoutHandler, SCH_ArbitraryArgument);