RE: State Information in smnpset: where to keep it?

> One way to implement this is to have a structure that has backup values stored,
> such that you have the object you want to read and write, OID, and an
> placeholder old_OID.
>
> You can then iterate over the request varbinds, storing any old values until such
> time as you commit them, or undo the set.

I don't think I understand.  I am not interating over anything now, I am just getting handle_somevariableofmine() calls and I look reqinfo->mode to see what I am supposed to do.  (I have a single template I feed to mib2c and it produces a long file of repetitious code, and I figure that is the way I am supposed to do things.)

In each handler function, when I see the MODE_SET_RESERVE1, I do my pre-flighting to make sure the details make sense, then when I get the MODE_SET_COMMIT I actually store the data.  I was thinking that intermediate results from the MODE_SET_RESERVE1 step could be reused in the MODE_SET_COMMIT.  (I could just duplicate that work in COMMIT, it has no side effects, but that seems wrong.)

Is there something I should already be iterating over or are you describing an iteration I would do to connect up RESERVE1 stuff with COMMIT stuff?

Right now I am just using statics and it seems that net-snmp does not reenter my code and mix calls from more than one snmpset, but I don't know that this is guaranteed.

I was expecting I would allocate a structure in RESERVE1 and hang it from something in reqinfo, then in later calls refer to it, and in COMMIT or FREE, deallocate it.  But I don't see where to hang it.

Thanks,

-kb

--
Kent Borg
Software Engineer
CSR Technology, Inc.
A member of the CSR Group of Companies
+1-781-791-6282
[email protected]

________________________________
From: [email protected] [[email protected]]
Sent: Tuesday, January 08, 2013 10:41
To: Kent Borg; [email protected]
Subject: RE: State Information in smnpset: where to keep it?

One way to implement this is to have a structure that has backup values stored, such that you have the object you want to read and write, OID, and an placeholder old_OID.

You can then iterate over the request varbinds, storing any old values until such time as you commit them, or undo the set.
-------- Original Message --------
Subject: State Information in smnpset: where to keep it?
From: Kent Borg <[email protected]<mailto:[email protected]>>
Date: Tue, January 08, 2013 9:07 am
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>

Hello,

I am working on an AgentX agent to run in an embedded beast, and I seem to have things working.

But I am worried about the state machine used in setting a variable. How do I save state information between MODE_SET_RESERVE1 and MODE_SET_RESERVE2, MODE_SET_COMMIT?

 - reginfo->my_reg_void seems to be per-registration not per-request.
 - my_void is mentioned in old mailing list traffic but doesn't seem to exist anymore
 - storing in static variables in my handler functions seems to work, but is it safe?

Thanks,

-kb

--
Kent Borg
Software Engineer
CSR Technology, Inc.
A member of the CSR Group of Companies
+1-781-791-6282
[email protected]<mailto:[email protected]>



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