code: func TranslateErrno(e syscall.Errno) *tcpip.Error {
  	if err := translations[e]; err != nil {
  		return err
  	}
  	return tcpip.ErrInvalidEndpointState
  }
docs: // TranslateErrno translate an errno from the syscall package into a
  // *tcpip.Error.
  //
  // Valid, but unreconigized errnos will be translated to
  // tcpip.ErrInvalidEndpointState (EINVAL). Panics on invalid errnos.