Re: Table iterator and get-next question

On Thu, 2005-11-24 at 19:43 +0100, Barbara Kuriata wrote:

> But what happens if some error occurs either in get_first_data_point
> or get_next_data_point routine? Shouldn't the get-next process be
> interrupted and the General Error be returned in Response?
>
> That what I thought after reading the RFC 3416, which explains
> processing of get-next requests the following way (chapter 4.2.2. The
> GetNextRequest-PDU):

Please don't make the mistake of equating the 'get_{first,next}'
hook routines with individual GetNext requests. They do *NOT*
work at this level.

The purpose of the 'get_{first,next}' mechanism is to locate the
appropriate row of the table for a *single* GetNext (or Get) request.
Each individual request will trigger a full 'get_{first,next}' scan
of the table.

So the description in RFC 3416 is not directly applicable to
these routines.



> Is there any way to return error code from the get_first_data_point
> and get_next_data_point routines?

What sort of errors did you have in mind?

> Or error occuring in those functions is treated the same way as
> when next index is not found?

These functions are not really concerned with interpreting
index values - that's the role of the iterator helper.
These routines will *report* the index for each row in turn,
but don't actually use this information themselves. They
use the 'loop_context' parameter to keep track of the current
location within the table. But that's very much a short-term
thing - concerned with processing a single GETNEXT request,
not a full "snmpwalk".


Dave
>


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