I've met some troubles really headachy,pls help me!

Dear sir:
      I am redeveloping a SNMP agent using net-snmp 5.2.3 package under linux.After nearly 2 moth's using ,I've met several problems i can't resolve which will be listed below.I will really appreciate your help.
   
  1.About scalar variable's handler function
      I have a scalar variable in my mib.When it is being GET,it will return the source ip of  this GET request(the soruce ip of the UDP packet).Then, I use the parameters "requests->agent_req_info->asp->session->peername" or "reqinfo->asp->session->peername" of the handler function:
  handle_peername(netsnmp_mib_handler *handler,
                netsnmp_handler_registration *reginfo,
                netsnmp_agent_request_info *reqinfo,
                netsnmp_request_info *requests)
  to get it,but failed.It just returns null string.It seems like that these parameters did not get the value I want and just had their system-initial values.
  So,how can i get the ip of the requesting pc?
   
  2.About SNMPV2 trap
      My old agent was developed under vxwoks.It send trap2 messages,but don't contain the varbind: sysTimeUp.0 and sysTrapOid.0. So the manager  parse trap2 pdu in this simpler format.It can't parse standard trap2 pdu sent by net-snmp API.Can net-snmp send or parse trap2 messages in this simpler format?
   
  3.About general net-snmp apps' executing
      I've downloaded all the source files of NET-SNMP-TUTORAIL 5,including the makefile.When making,it succeed.But when executing,1 error occurs:"error while loading shared libraries: libnetsnmp.so.9: cannot open shared object file: No such file or directory".However,the file libnetsnmp.so.9 does exist in the directroy /usr/local/lib.WHY?
   
  4.About table variable's implement
      I use the module mib2c.iterate.conf to build C files for the table variable, and modify the codes according to  agent/mibgroup/mibII/udptable.c. When using a linked list to store table datas,it is all right.But when using a array to store these datas,it will automatically add an empty row to the beginning when requested.If using snmptable to get the table datas,i will see an empty row with system-initialized values,then there are my correct datas,while the array datas is correct.WHY?
   
  These questions really have puzzled me for a long time.Thank you very much for your help or other useful suggestions!
   
  Best reagards,
   
  zhou
   
   

 		
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