Re: related tables design

> On 23/01/2008, Xuan Pan <[email protected]> wrote:
>> > ....run a single "snmpgetnext -r 0 -t 6000 ..." query against this
>> agent,
>> > and single step through the routine until you hit this error.
>> >    What does the structure pointed to by 'pIndex' look like at that
>> point?
>>
>> Well it is a segmentation fault caused by a 'NULL' pIndex pointer (print
>> pIndex returns 0x1). Sadly, it looks wrong.
>
>
> What is the *full* code of:
>    -  the module initialisation routine;
>    -  the getFirst hook routine;
>    -  the getNext hook routine
> ?
>
> Which line of code triggers the segmentation fault?
>
> What is the exact command that you ran to query the agent?

My getNextIpRangeContext function

LPDHCPSETTINGS lpDhcpListEntry =  NULL;
LPCHCPIPRANGE lpDhcpIpRangeEntry = NULL;

lpDhcpIpRangeEntry = (LPDHCPIPRANGE)(*loopContext);
if(!lpDhcpIpRangeEntry)
{
    DEBUGMSGTL((...));
    return NULL;
}
lpDhcpListEntry = lpDhcpIpRangeEntry->parentDhcpNode;
if(!lpDhcpListEntry)
{
     DEBUGMSGTL((....));
     return NULL;
}
if(lpDhcpIpRangeEntry->next)
{
     lpDhcpIpRangeEntry = lpDhcpIpRangeEntry->next;
}
else
{
     lpDhcpListEntry = lpDhcpListEntry->next;
     if(!lpDhcpListEntry)
     {
          return NULL;
     }
     lpDhcpIpRangeEntry = lpDhcpListEntry->lpDhcpIpRangeHead;
}
snmp_set_var_value(pIndex, (u_char *)& lpDhcpEntry->index, sizeof(int));
pIndex = pIndex->next_variable;   //<===At this point===
snmp_set_var_value(pIndex, (u_char *)& lpIpRangeEntry->index, sizeof(int));
...
I just started the agent in gdb debugger and 'next' until the line with
the error and ran 'print pIndex' and I got 0x1

Pan


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