On 17 May 2011 at 11:04, Robert Story wrote:
> On Tue, 17 May 2011 09:05:05 +0200 Giuseppe wrote:
> GM> 2. Variables that are meaningful only if an optional hardware is
> GM> installed in the electronic equipment. In this case, if the optional
> GM> hardware is not present, I can't associate a value for related
> GM> variables. Should I return an error code to GET and SET requests?
> GM> Which error codes? SNMP_ERR_GENERR?
> GM> In the first I tried SNMP_ERR_RESOURCEUNAVAILABLE, but I think it is
> GM> for other purposes.
>
> For scalars, set the varbind to SNMP_NOSUCHOBJECT, eg
>
> netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHOBJECT);
>
> For table objects, use SNMP_NOSUCHINSTANCE.
>
> Make sure you do not return an error from the function.
Now I understand. The handler should returns always
SNMP_ERR_NOERROR, but the variable should be marked with an error
code with netsnmp_set_request_error().
Thank you for point me that. I have tried returning the error from
the handler and I had snmpwalk stopped at that OID. Does
netsnmp_set_request_error() solve the problem and let snmpwalk to
cross the entire tree, even in presence of errors for some
variables?
> GM> 3. Variables that are related to hardware sub-sections in the
> GM> machine. What should I return if this sub-section stop communicating
> GM> with the agent (for a mulfunction)? Which error code to choose?
>
> SNMP_ERR_RESOURCEUNAVAILABLE.
Should I use netsnmp_set_request_error() as above, or should I
return this error from the handler function?
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