[ns] What is the significance of recv()

[raja priya]

Dear All,
  
  Can anybody tell me the significance of recv() that is used in the tcl file 
of Ping???
  Also please tell me in what way, recv(Packet *,Handler *) used in .cc is 
releted to recv used in tcl???
  
  Please help me by providing this information. I need this for my graduation 
project.
  
  Regards
  S.Rajapriya
  
                
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