Re: Re: How agent acts upon receiving a request???

On 25/04/07, Reza Salehi <[email protected]> wrote:
> I am using
> netsnmp_register_int_instant(..,..,..,..My_handler)

I presume you mean  'netsnmp_register_int_instance()'

The basic idea of this particular helper is that you're
telling the agent:

   "Here's an integer variable.  Watch it, and whenever
    you're asked for this MIB object, return the current
    value of this watched variable buffer."

So by default, the agent will return the value from this
buffer.   You don't need to do anything else.

But before it returns this value, it will call your handler
(if any), to allow you to tweak the value being returned.
Note that the varbind has already been set up with the
value from your watched variable, so you need to update
the *varbind* - not (just) the variable buffer itself.

Normally, this buffer would be updated automatically
as part of the normal operation of the subsystem.
It's not really intended to be updated from the handler
itself - that rather negates the point of having a watched
buffer in the first place.


One final question - are you implementing a scalar object,
or an instance within a table?
   If this is a scalar MIB object, then you should probably
consider using "netsnmp_register_scalar()', and supply
the value in the handler, in the usual manner.
   The difference is in the handling of "invalid instances"
(e.g. myObject.1).   ns_register_scalar() will return the
correct error - ns_register_int_instance() gets this wrong
when used for a scalar object.


>    My_handler(....,....,netsnmp_agent_request_info *reqinfo,.......)
> then
>     case( reqinfo->mode)    .
> is this the right way?

I have no idea whether this is right or not.
You haven't given any indication of what you are actually
doing in the handler.
    "case( reqinfo->mode )"  is too vague to be useful.

Dave

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