Date: Thu, 10 May 2007 10:02:50 +0100> From: [EMAIL PROTECTED]> To: [EMAIL
PROTECTED]> Subject: Re: fetch/poll asynchronously variables> CC:
net-snmp-users@lists.sourceforge.net> > On 09/05/07, Deybach Florent <[EMAIL
PROTECTED]> wrote:> > In the agent I have to fetch asynchronously the value of
the variables in my> > MIB. i.e. I don't want to fetch it only when on a GET
command.> > I have to keep the variables all the time up-to-date.> > So I must
poll "in background" to update the variables in the MIB and> > eventually send
a trap.> >> > How Can I do this ?> > With a thread which will update the MIB ?>
> You *could* use a separate thread if you were very very careful> (bearing in
mind that the Net-SNMP agent is not designed for> threaded-operation). But the
simplest approach would be to> write a cache-based implementation (using the
standard cache> helper), and set the cache flag 'NETSNMP_CACHE_AUTO_RELOAD'> >
That single change is sufficient to have the agent automatically> reload the
data on a regular basis (determined by the cache timeout> value).
Ok and what if the update is not ignited by the agent ?
i.e. The agent cannot fetch itself the values in another application but the
agent "register" on a server
and the server send periodically (but when never know when, so we have to
listen) the values in order
to update them in the MIB.
> > Are there any examples ?> > There are relatively few examples of this sort
> > of cache auto-reloading,> all MfD-style implementations (if-mib/ifTable,
> > ip-mib/ipAddressTable and> ip-mib/ipSystemStatsTable). There are more
> > examples of cache-based> MIB modules, and most of the mib2c config
> > frameworks can generate a> cached-based template.> > I'd suggest that you
> > implement the MIB "normally", using whichever> table framework you're most
> > comfortable with, and using the cache> helper to load data on demand. Then
> > once this is working properly,> set the 'NETSNMP_CACHE_AUTO_RELOAD' cache
> > flag to get the> required automatic behaviour.> > Dave
Thx,
Florent
_________________________________________________________________
Essayez Live.com, votre nouvelle page d'accueil ! Personnalisez-la en quelques
clics pour retrouver tout ce qui vous intéresse au même endroit.
http://www.live.com/getstarted
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
Net-snmp-users mailing list
Net-snmp-users@lists.sourceforge.net
Please see the following page to unsubscribe or change other options:
https://lists.sourceforge.net/lists/listinfo/net-snmp-users
