Method writeFrame

pkg/sentry/socket/netstack/packetmmap/ring_buffer.go:166–183

writeFrame writes a frame to the ring buffer's internal mappings at the provided frame number.

(frameNum uint32, hdrView *buffer.View, pkt buffer.Buffer)

// writeFrame writes a frame to the ring buffer's internal mappings at the
// provided frame number.
func (rb *ringBuffer) writeFrame(frameNum uint32, hdrView *buffer.View, pkt buffer.Buffer) error {
	rb.mu.Lock()
	defer rb.mu.Unlock()
	ims, err := rb.internalMappingsForFrame(frameNum, hostarch.Write)
	if err != nil {
		return err
	}
	frame := buffer.MakeWithView(hdrView)
	frame.Merge(&pkt)
	br := frame.AsBufferReader()
	defer br.Close()

	rdr := safemem.FromIOReader{Reader: &br}
	if _, err = rdr.ReadToBlocks(ims); err != nil {
		return err
	}
	return nil
}

// incHead increments the head of the ring buffer.
//