my_reg_void pointer in netsnmp_handler_registration structure

Hi all,

I need to keep some external data on registering an snmp instance (or 
table), that can be retrieved back whenever the instance handler is called.
Fromt the name, I assume that my_reg_void in 
netsnmp_handler_registration structure can be used for this purpose, 
could some one please confirm if I am right or wrong?
What I want to do is like this:

1) Register the instance and keep pointer to my external data
  my_reginfo = netsnmp_create_handler_registration("my_instance",
                                            my_instance_handler,
                                            my_oid,
                                            OID_LENGTH(my_oid),
                                            HANDLER_CAN_RWRITE);
  my_reginfo->my_reg_void = (void*) my_external_data_ptr;

2) Recover my external data inside the instance handler
  int my_instance_handler(netsnmp_mib_handler *handler,
                         netsnmp_handler_registration *reginfo,
                         netsnmp_agent_request_info *reqinfo,
                         netsnmp_request_info *requests)
 
  mydata = (mydata_type*) reginfo->my_reg_void;


I have done some tests and it works, however I'm not sure that is what 
my_reg_void is intended to be for, and if anything else in snmp 
libraries uses it.

Lots of thanks,
Vinh

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