Re: Table iterator

An additional question. Consider the following code:

netsnmp_variable_list *moTable*_get_next_data_point*(void 
**my_loop_context, void **my_data_context,
                         netsnmp_variable_list *put_index_data,
                         netsnmp_iterator_info *mydata)
{
    netsnmp_variable_list *vptr;

        struct moTable_entry *entry;
        entry = (struct moTable_entry*)(*my_loop_context);
       
        if (entry == NULL) {
            ...
        }
       
        entry = entry->next;
        *my_loop_context = (void*)entry;
        *my_data_context = (void*)entry;
       
    vptr = put_index_data;

   *     // End of table
        if (entry == NULL) {
            snmp_set_var_value(vptr, (u_char *) NULL, 0);
            vptr = vptr->next_variable;
            return put_index_data;
        }*

        snmp_set_var_value(vptr, (u_char *) &entry->moIndex, 
sizeof(entry->moIndex));
        vptr = vptr->next_variable;

      return put_index_data;
}

In the "End of table" code portion, how should the function return(the 
iterator should end, no more entries are available)? My .so is crashing 
snmpd...
Thanks,
    Sebastian-


Sebastian Bello escribió:
> Thanks Dave!
>
> Dave Shield escribió:
>   
>> On 07/09/06, Sebastian Bello <[email protected]> wrote:
>>     
>>> 1- the data from the MIB table will be collected periodically from other
>>> processes, and be probably cached for some time; is table_iterator the
>>> right choice?
>>>       
>> It can certainly be used that way.
>>
>>    mib2c -S cache=1 -c mib2c.iterator.conf ...
>>
>> should generate a suitable template.
>>
>>
>>     
>>> 2- mib2c created a list representing the table. Will net-snmp browse
>>> this table to look for the data or should the data be obtained from
>>> another source (programatically or from another data structure)?
>>>       
>> The template code generated will walk this list.
>> You can set the cache_load routine to build it from some external source.
>>
>> Alternatively, you can amend the get_{first,next} routines to read the
>> data from elsewhere instead.  That list is primarily to illustrate how
>> to handle things, rather than forcing you to work this exact way.
>>
>>
>>
>>     
>>> 3- where is the 'data context' stored (I don't see where it gets
>>> 'registered')? What is it for (to be able to keep an additional data
>>> structure other than the table itself)?
>>>       
>> The data_context is your handle on a particular row of the table.
>> This is what's passed to the handler routine (via
>> 'netsnmp_extract_iterator_context')
>> Your haqndler then uses this to retrieve the appropriate column value
>> from that particular row.
>>
>>
>>
>>     
>>> 4- what information does the 'netsnmp_variable_list' hold in
>>> '_get_next_data_point' and '_get_first_data_point'?
>>>       
>> The index value(s) for each row in turn.
>>
>>
>>     
>>> 5- is there a full documentation for the API (is there doc for
>>> 'snmp_set_var_typed_value' for example)?
>>>       
>> Probably not.
>> There's some info on the project web pages  (Documentation->API),
>> auto-generated from the code files.  Not sure that this counts as
>> "full documentation" though.
>>
>> Dave
>>
>>     
>
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