RE: Infinitly looping call to get_first_data_point function

What happens when you register your getFirst as your getNext?  An infinite loop.  So I have overcome the infinite loop :) but I guess my question still stands...is my implementation of getFirst valid?  I've also included my implementation of getNext...
 
netsnmp_variable_list* PresetDataTableHandler::getNext(
        void **my_loop_context,
        void **my_data_context,
        netsnmp_variable_list *put_index_data,
        netsnmp_iterator_info *mydata) {
    
printf("%s:%d %s\n", __FUNCTION__, __LINE__, "Entered.");

    netsnmp_variable_list *idx = put_index_data;
    netsnmp_variable_list *ret = NULL;
    
    
     const long maxPresets =
             SubAgent::getInstance().getDBReader()->getNumPresets();
    
    
    if (PresetDataTableHandler::iterIdx < maxPresets - 1){

        PresetDataTableHandler::iterIdx++;
        
        snmp_set_var_typed_integer(
                idx,
                ASN_INTEGER,
                PresetDataTableHandler::iterIdx );

        ret = idx;

        idx = idx->next_variable;
    }

printf("%s:%d %s\n", __FUNCTION__, __LINE__, "Exit.");

    return ret;
}

 
In my get and set processing I use the following to get my index that I set:
 
long entryIdx = *(table_info->indexes->val.integer);
 
is this correct?  Below is my get processing...
 
int PresetDataTableHandler::processGetRequest(
        netsnmp_mib_handler*          handler,
        netsnmp_handler_registration* reginfo,
        netsnmp_agent_request_info*   reqinfo,
        netsnmp_request_info*         requests) {
    
printf("%s:%d %s\n", __FUNCTION__, __LINE__, "Entered.");

    netsnmp_request_info       *request;
    netsnmp_table_request_info *table_info;
 
    for (request=requests; request; request=request->next) {
        
        PresetDataTableEntry entry; 
        
        table_info = netsnmp_extract_table_info(request);
 
        long entryIdx = *(table_info->indexes->val.integer); // my index set in getNext?
 
        if(SubAgent::getInstance().getDBReader()->getPresetDataTableEntry(
                entryIdx, &entry)) {
        
            
            switch (table_info->colnum) {
            case COLUMN_INDEX:
                snmp_set_var_typed_integer(
                        request->requestvb,
                        ASN_INTEGER,
                        entry.getIndex());
                break;
            case COLUMN_VAL1:
                snmp_set_var_typed_integer(
                        request->requestvb,
                        ASN_INTEGER,
                        entry.getVAL1());
                break;
            case COLUMN_VAL2:
                snmp_set_var_typed_integer(
                        request->requestvb,
                        ASN_INTEGER,
                        entry.getVAL2());
                break;
            default:
                netsnmp_set_request_error(reqinfo, request,
                                          SNMP_NOSUCHOBJECT);
                break;
            }
        } else {
            netsnmp_set_request_error(
                    reqinfo,
                    request,
                    SNMP_NOSUCHINSTANCE);
        }
    }
    
printf("%s:%d %s\n", __FUNCTION__, __LINE__, "Exit.");
    return SNMP_ERR_NOERROR;
}

 
 


----------------------------------------
> From: [email protected]
> To: [email protected]
> Subject: Infinitly looping call to get_first_data_point function
> Date: Mon, 2 Nov 2009 10:31:46 -0500
>
>
> When I use snmpget or snmpgetnext to access data in my table, I get a timeout. I put some printfs in my code and noticed that my get_first_data_point function (getFirst in my case) is infinitly being called. I am assuming I am not setting something correctly in the function. All I do is set idx (put_index_data) to the first index of my data array (0). Do I HAVE to set loop_context and data_context? My data is external to the subagent; and all I need is the index for snmpset and snmpget handling. Should I set the loop_context to the address of my static iterIdx variable below?
>
>
> netsnmp_variable_list* PresetDataTableHandler::getFirst(
> void **my_loop_context,
> void **my_data_context,
> netsnmp_variable_list *put_index_data,
> netsnmp_iterator_info *mydata) {
>
> printf("%s:%d %s\n", __FUNCTION__, __LINE__, "Entered.");
>
> netsnmp_variable_list *idx = put_index_data;
>
> PresetDataTableHandler::iterIdx = 0;
>
> snmp_set_var_typed_integer(
> idx,
> ASN_INTEGER,
> PresetDataTableHandler::iterIdx );
>
> idx = idx->next_variable;
>
> printf("%s:%d %s\n", __FUNCTION__, __LINE__, "Exit.");
>
> return put_index_data;
> }
>
>
> Thanks,
>
> Steve
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ahead of the curve. Join us from November 9 - 12, 2009. Register now!
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