Thanks Dave. That's very helpful.
2008/6/5, Dave Shield <[EMAIL PROTECTED]>:
>
> 杨伟 wrote:
>
>> Now I am in the FindVarMethod type functioin.
>>
> So you're using the old v4-style approach for implementing a table.
>
> I am curious about how could it jump from the end of a previous table to
>> the beginning of the next table?
>>
> Each table is implemented individually.
> The FindVarMethod routine will be given an OID, and attempts to return
> the next valid OID within that table. If it can't then it returns NULL to
> indicate failure. That's all it knows about.
>
> The main agent code has a list of registered tables.
> When it receives an SNMP request, it identifies the
> table that this request refers to, and calls that FindVarMethod
> (or v5 equivalent) to provide the appropriate results.
> If the table handler returns NULL, then the agent
> moves on to the next table, and so on.
>
> So it's the agent driving code that jumps from one table to the next,
> not the code for the individual tables.
>
>
> Dave
>
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