)' is shorthand for this.  Returns 0 if the
     timeout is set successfully.

 -- Function: int rl_timeout_remaining (unsigned int *secs, unsigned int
          *usecs)
     Return the number of seconds and microseconds remaining in the
     current timeout duration in *SECS and *USECS, respectively.  Both
     *SECS and *USECS must be non-NULL to return any values.  The return
     value is -1 on error or when there is no timeout set, 0 when the
     timeout has expired (leaving *SECS and *USECS unchanged), and 1 if
     the timeout has not expired.  If either of SECS and USECS is
     'NULL', the return value indicates whether the timeout has expired.