Re: How to implement Counter64

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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