3:/std/callout.c (/std/callout.c)
(int) find_call_out(string func)
/*
 * Function name: find_call_out
 * Description:   Locate an existing call_out to a named function
 * Arguments:     func - name of function the call_out should call
 * Returns:       -1 if not found, else time left before triggered
 */
