Re: What should I do if I want to update the table list before each request for the whole table

On 21/08/06, James Deng D (SH/CBC) <[email protected]> wrote:
> I want to update my table (which is a linked list) before each request for
> the whole table instead of each column,
> That's to say, I want to get the latest table list each time when I execute
> a snmptable command.

And what should the agent do when it gets a request for an individual
element of the table
(rather than someone walking the whole table)?   Should it re-load the
table or not?


> For a scalar, I can use the get handler, and set the latest value each time
> when I get a MODE_GET request, is there a MODE_GET_LIST or something like
> that for me to track a request for a whole table?

No - as far as the agent is concerned, it receives a sequence of
GETNEXT requests (which may well be converted into MODE_GET by the
time they reach the MIB handler).

The usual approach in this situation is to cache the contents of the
table for a given period, and only reload this once the cache has
expired.  If you set the timeout to be fairly short
(say 2-3 s), then that will probably have the same general effect -
particularly if the table isn't massive.

There's an example of this approach in (e.g) mibII/udpTable.c
See the end of 'init_udpTable()' and the routines 'udpTable_load' and
'udpTable_free'

Dave

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