issues with dynamic row creation of table.

[gautam borad]

Hi,
    I'm using net-snmp v 5.3.0.1 mib2c to generate the .c files. I want to implement a table
with RowStatus and that allows dynamic creation of rows. Now the problem is that i have
a column  in the table that needs to have unique value (apart from the index) across the entire table.
So when a createandgo request comes with all the variable bindings I want to go through the
entire resuests ie each variable bind and extract out the myID ( the one that i want unique)
and check whether it is assigned to any other row of myTable. If it is the agent should
return an error and not set other values. ie not create the row.
Similarly with createandwait.

Here is what i tried but it did not work.
I created the .c file using  "mib2c -c mib2c.create-dataset.conf vac"
when i do 
snmpset -c xxxx -v2c x.x.x.x myTable.1.5.1 i 4 myTable.1.2.1 i 10 myTable.1.3.1 i 2 myTable.1.4.1 i 1

I can go through the request using somethig like this in myTable_handler :

for ( request = requests ; request ; request = request->next){
            requestvb = requests->requestvb;
            table_info = netsnmp_extract_table_info(request);
            .....
            if(table_info->colnum !=COLUMN_V5INTERFACEID){
                     .....
                    if(tmpTable[index] == *(request->requestvb->val.integer) ){
                                        // the  myID  is already assigned to some other row
                                        return SNMP_ERR_GENERR;   // Is it OK to return here??
                              else
                                       // the myID doesnot exist so update local table n continue
                                        tmpTable[index] = *(request->requestvb->val.integer);
              }
The tmpTable[] is my array where i store the already assigned myID values.

The problem is that before the request comes to myTable_handler it is already
 processed by the master table_dataset handler in helpers/table_dataset.c

My queries:

1: Which conf file is best suitable for my case (going through all rows and comparing for unique column) :
          create-dataset.conf  or  table_data.conf  or  container.conf or mfd.conf
2: how and where do i need to put the code for the check?
          default_handler or my_handler or somewhere else..
3: how do i handle the createandwait case?
4: When some request comes how do i check other rows , so i dont need to
    implement my own array and go through it to see whether the myID is already
    assigned ( or is this the best way? )

Also i did not find much documentation on the agent implementation.(and hence this post  )
Can anyone plz point me to some good documentation/example code?

Thanks in advance.


























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