RE: snmpget V2 looping subagent

Hello

I have not looked at your problem at all. Just a quick remark on shared memeory. Pointers in shared memeory is not a good idea! Different processes will have different base pointers to the shared memeory, therefore linked lists and similar will not work.

> Hi,
>
> Thanks for the replay.
>
> This is an example code of the first_data_point function of
> one of the tables :
>
> netsnmp_variable_list *
> connectionToDBSTable_get_first_data_point(void **my_loop_context,
> void **my_data_context,
> netsnmp_variable_list *
> put_index_data,
>
> netsnmp_iterator_info *mydata) {
> netsnmp_variable_list *vptr;
> int i = 0;
> if(pMIB)
> {
> pMIB->connectionDBS[0].index = 0;
> pConDBS_m = &pMIB->connectionDBS[0];
> i++;
> while(i < SHM_MAX_NO_OF_AMS &&
> pMIB->connectionDBS[i].dbs_num != MAX_ENTITIES_NUM){
> pMIB->connectionDBS[i].index = i;
> pConDBS_m->next = &pMIB->connectionDBS[i];
> pConDBS_m = pConDBS_m->next;
> i++;
> }
> pConDBS_m->next = NULL;
> pConDBS_head = pMIB->connectionDBS;
> *my_loop_context = (void *)pConDBS_head;
> *my_data_context = (void *)pConDBS_head;
> vptr = put_index_data;
> snmp_set_var_value(vptr,
> (u_char *)&pConDBS_head->index,
> sizeof(int));
> return put_index_data;
> }
> else
> {
> return NULL;
> }
> }
>
> I have removed the part of the code that checks if the table
> is empty and returns a NULL because this what causes the endless loop.
> pMIB is a pointer to a shared memory. pMIB->connectionDBS is
> an array in the shared memory that holds all the items of a
> certain table. In every get request, I create a new linked
> list from the array that holds all the items of the current
> table. The while loop runs till it finds an initialized item.
> (e.g.
> array[1,2,3,2,4,7,1,3,MAX_ENTITIES_NUM,MAX_ENTITIES_NUM. ..]
> so the linked list would be 1->2->3->2->4->7->1->3->NULL).
> Basically there should be an if clause that checks if
> pMIB->connectionDBS[0] == MAX_ENTITIES_NUM and return NULL
> for empty table.
>
> Let me know if you need other parts of my code.
>
> Thanks
>
>
> -----Original Message-----
> From: Wes Hardaker [mailto:hardaker@users.sourceforge.net]
> Sent: Wednesday, June 14, 2006 6:36 PM
> To: Shinar, Gil
> Cc: net-snmp-coders@lists.sourceforge.net
> Subject: Re: snmpget V2 looping subagent
>
> >>>>> On Tue, 13 Jun 2006 18:06:11 +0300, "Shinar, Gil"
> <Gil.Shinar@verint.com> said:
>
> Gil> When I've tried to debug the code, I saw differences
> between what I
> get
> Gil> when I use snmpwalk then when I use the snmp manager.
>
> Unfortunately, it's unlikely we can help you without looking
> at the code you've written. It certainly is related to how
> you're handling your code because the agent itself shouldn't
> be suffering from any issues related to multiple requests in
> a single PDU.
>
> Gil> Is there a patch that should fix it ? Is there a
> difference between
> V1
> Gil> mib file to V2 mib file and if there is, should I use V2 mib file
> to
> Gil> generate the code with mib2c command ?
>
> It shouldn't matter.
> --
> Wes Hardaker
> Sparta, Inc.
>
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