flags

(typename $subscription_clock
  (record
    ;;; The clock against which to compare the timestamp.
    (field $id $clockid)
    ;;; The absolute or relative timestamp.
    (field $timeout $timestamp)
    ;;; The amount of time that the implementation may wait additionally
    ;;; to coalesce with other events.
    (field $precision $timestamp)
    ;;; Flags specifying whether the timeout is absolute or relative
    (field $flags $subclockflags)
  )
)