// by InitBufs, so it can be released by garbage collector.
func (o *operation) ClearBufs() {
	for i := range o.bufs {
		o.bufs[i].Buf = nil
	}
	o.bufs = o.bufs[:0]
}

func (o *operation) InitMsg(p []byte, oob []byte) {
	o.InitBuf(p)
	o.msg.Buffers = &o.buf
	o.msg.BufferCount = 1

	o.msg.Name = nil
	o.msg.Namelen = 0

	o.msg.Flags = 0
	o.msg.Control.Len = uint32(len(oob))