digraph "pbuf"
{
 // LATEX_PDF_SIZE
  edge [fontname="Helvetica",fontsize="10",labelfontname="Helvetica",labelfontsize="10"];
  node [fontname="Helvetica",fontsize="10",shape=record];
  Node1 [label="{pbuf\n|+ flags\l+ len\l+ payload\l+ ref\l+ tot_len\l+ type\l|}",height=0.2,width=0.4,color="black", fillcolor="grey75", style="filled", fontcolor="black",tooltip=" "];
  Node1 -> Node1 [color="grey25",fontsize="10",style="solid",label=" +next" ,arrowhead="odiamond",fontname="Helvetica"];
}