timerfd_create

Create and return a timer file descriptor.

clockid
  A valid clock ID constant as timer file descriptor.

  time.CLOCK_REALTIME
  time.CLOCK_MONOTONIC
  time.CLOCK_BOOTTIME
flags
  0 or a bit mask of os.TFD_NONBLOCK or os.TFD_CLOEXEC.

  os.TFD_NONBLOCK
      If *TFD_NONBLOCK* is set as a flag, read doesn't blocks.
      If *TFD_NONBLOCK* is not set as a flag, read block until the timer fires.

  os.TFD_CLOEXEC
      If *TFD_CLOEXEC* is set as a flag, enable the close-on-exec flag