Infinitly looping call to get_first_data_point function

[Steve Stetka]

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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[Steve Stetka]

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: ste...@hotmail.com
> To: net-snm...@lists.sourceforge.net
> Subject: Infinitly looping call to get_first_data_point function
> Date: Mon, 2 Nov 2009 10:31:46 -0500

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