Re: SET

Thank you. I'll be returning to this problem in a week or two and that will
help me.

On Thu, Jul 12, 2018 at 12:13 PM, Robert Story <[email protected]> wrote:

> On Fri, 1 Jun 2018 14:19:30 +0100 David wrote:
> DA> My first goal is just to process setting a simple scalar value,
> DA> but eventually I will want to look at row creation so I'd like
> DA> to understand the bigger picture.
> DA>
> DA> The example handler
> DA> <http://search.cpan.org/~hardaker/NetSNMP-agent-5.0401/
> agent.pm#Sub-agent_example>
> DA> shows
> DA> process a SET_ACTION request, but it doesn't indicate what if,
> DA> anything I am required to do.
> DA>
> DA>  } elsif ($request_info->getMode() == MODE_SET_ACTION) {
> DA>            # ... (or use the value)
> DA>            $value = $request->getValue();
> DA>  }
> DA>
> DA> First, processing relating to the value. I guess that I do
> DA> whatever the value means (eg. adjust a setting in the system
> DA> that the MIB represents) and perhaps adjust any cached values
> DA> in my agent. I'm not clear whether I also need to call
> DA> request->setValue() or whether a subsequent GET just picks up
> DA> the new state.
>
> No need to call request->setValue since you can't change the value
> returned in the request and your internal value should have just
> been set.
>
> DA> Then the other aspect is to return something to my caller.
> DA> Studying the C code examples it looks like maybe all I need to
> DA> do is call request->setError() if there's a problem, and
> DA> possibly setDelegated() if there is deferred work. Seem like I
> DA> then see the remaining SET stages occur until we reach Commit.
>
> Yep. This simple example doesn't cover all of set processing. There
> is a state diagram here:
>
>   http://www.net-snmp.org/tutorial/tutorial-5/toolkit/
> mib_module/set-actions.jpg
>
> And a more complete description of the various states here:
>
>   http://net-snmp.sourceforge.net/wiki/index.php/Agent_
> Modes#Set_processing
>
>
> Robert
>

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