Re: How to implement Counter64

Thanks a lot Dave.
I tried that u long long spliting-stiching as you said and it worked 
perfectly.

Cheers,
Vinh

Dave Shield wrote:
> On 09/10/2007, Vinh Nguyen <[email protected]> wrote:
>   
>> Does anyone know how to implement a Counter64 variable (in a subagent)
>> using net-snmp?
>>     
>
> Such values are handled using "struct counter64" variables.
> This is basically two 32-bit integers bundled together, containing
> the low and high order halves of the 64-bit value.
>
> There's an example of this in the file 'mibgroup/ucd-snmp/diskio.c'
> Look for mention of DISKIO_NREADX or DISKIO_NWRITTENX
>
> This particular module uses the old UCD v4 API, so the style of
> code is very different from the v5 helper-based approach.  But
> the way of handling 64-bit values is the same.
>
>
>   
>>  From the source code, there seems to be a special struct U64
>>     
>
> The type "U64" is a typdef alternative to "struct counter64", yes.
>
>
>
>   
>> Also, if instead of using that U64 type, I store my data as an "unsigned
>> long long" (64bit) in C++, and on retrieving data for snmp GET, use
>> pointer to this variable + set type to ASN_COUNTER64, would it work?
>>     
>
> No.
> The Net-SNMP library holds 64-bit values as a pair of 32-bit values,
> rather than as a single 64-bit value.   You'd need to split the
> "u long long" value into two before passing it into the net-snmp
> library routines, and then stitch the two halves back again afterwards.
>
> Dave
>   


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