// GetAddrInfoEx with lpOverlapped, which requires
		// Windows 8 or newer. I guess we'll need oldLookupIP,
		// newLookupIP, and newerLookUP.
		//
		// For now we just let it finish and write to the
		// buffered channel.
		return nil, newDNSError(mapErr(ctx.Err()), name, "")
	}
}

func (r *Resolver) lookupPort(ctx context.Context, network, service string) (int, error) {
	if systemConf().mustUseGoResolver(r) {

// generation.
type spilledBatch struct {
	gen uint64
	*batch
}

// readGeneration buffers and decodes the structural elements of a trace generation
// out of r. spill is the first batch of the new generation (already buffered and
// parsed from reading the last generation). Returns the generation and the first
// batch read of the next generation, if any.
//
// If gen is non-nil, it is valid and must be processed before handling the returned

	path := file.Name()
	file.WriteString(contents)
	file.Close()
	return path
}

// localListener is set up by TestMain and used by localPipe to create Conn
// pairs like net.Pipe, but connected by an actual buffered TCP connection.
var localListener struct {
	mu   sync.Mutex
	addr net.Addr
	ch   chan net.Conn
}

const localFlakes = 0 // change to 1 or 2 to exercise localServer/localPipe handling of mismatches

	// Override the default kube client constructor
	KubeClientBuilder func(objects ...runtime.Object) kubelib.Client

	// ListenerBuilder, if specified, allows making the server use the given
	// listener instead of a buffered conn.
	ListenerBuilder func() (net.Listener, error)

	// Time to debounce
	// By default, set to 0s to speed up tests
	DebounceTime time.Duration

	}
	return n, err
}

// diskHealthReader provides a wrapper that will update disk health on
// ctx, on every successful read.
// This should only be used directly at the os/syscall level,
// otherwise buffered operations may return false health checks.
func diskHealthReader(ctx context.Context, r io.Reader) io.Reader {
	// Check if context has a disk health check.
	tracker, ok := ctx.Value(healthDiskCtxKey{}).(*healthDiskCtxValue)

// output in a deterministic order.
type sequencer struct {
	maxWeight int64
	sem       *semaphore.Weighted   // weighted by input bytes (an approximate proxy for memory overhead)
	prev      <-chan *reporterState // 1-buffered
}

// newSequencer returns a sequencer that allows concurrent tasks up to maxWeight
// and writes tasks' output to out and err.
func newSequencer(maxWeight int64, out, err io.Writer) *sequencer {

    )
    val call1 = client.newCall(Request(server.url("/")))
    val response1 = call1.execute()
    waitForDataFrames(Http2Connection.OKHTTP_CLIENT_WINDOW_SIZE)

    // Cancel the call and discard what we've buffered for the response body. This should free up
    // the connection flow-control window so new requests can proceed.
    call1.cancel()
    assertThat(
      response1.body.source().discard(1, TimeUnit.SECONDS),

	ErrWriteOnClosed = errors.New("write on closed ringbuffer")
)

// RingBuffer is a circular buffer that implement io.ReaderWriter interface.
// It operates like a buffered pipe, where data written to a RingBuffer
// and can be read back from another goroutine.
// It is safe to concurrently read and write RingBuffer.
type RingBuffer struct {
	buf       []byte
	size      int

	br *bufio.Reader // used until empty
	io.ReadWriteCloser
}

func (b *readWriteCloserBody) Read(p []byte) (n int, err error) {
	if b.br != nil {
		if n := b.br.Buffered(); len(p) > n {
			p = p[:n]
		}
		n, err = b.br.Read(p)
		if b.br.Buffered() == 0 {
			b.br = nil
		}
		return n, err
	}
	return b.ReadWriteCloser.Read(p)
}

func (sysver SystemVerificationCheck) Check() (warnings, errorList []error) {
	klog.V(1).Infoln("running all checks")
	// Create a buffered writer and choose a quite large value (1M) and suppose the output from the system verification test won't exceed the limit
	// Run the system verification check, but write to out buffered writer instead of stdout
	bufw := bufio.NewWriterSize(os.Stdout, 1*1024*1024)
	reporter := &system.StreamReporter{WriteStream: bufw}