RE: agent_check_and_process: select info

Sam V <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>


Thanks, let me know if you have an idea for a fix? It is easy to reproduce. Just let snmp agent run then set the system date and time backwards.
 



> Subject: Re: agent_check_and_process: select info
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> Date: Fri, 11 Sep 2009 08:11:31 +0200
> 
> On Wed, 2009-09-09 at 10:39 -0400, Samer Vazdekis wrote:
> > 
> > Hi there,
> > I'm running net-snmp version 5.2.1.2. I'm coming across a problem in
> > snmp_select_info(). This part of code didn't change when I compared it
> > to version 5.4.2. Basically, this is using gettimeofday() to figure
> > out the timeouts. When I reset system date and time, specially
> > backwards, the select fails and keeps on failing until I set back the
> > date and time. I'm considering a solution that changes the request's
> > time, expire, and timeout values (in netsnmp_request_list) if current
> > time is found to be less than the time the request was created.
> 
> >  Pleae, let me know your opinion. Or maybe if there is already a fix
> > for this.
> 
> This is a hard problem.
> 
> The problem is that there are two concepts - wait for X time units and
> wait until time T - but only one interface to handle it.
> 
> Check out the thread "Patch for delaying of tasks attached to
> snmp_alarm_register" from september-october 2005 for a lot more
> description.
> http://thread.gmane.org/gmane.network.net-snmp.devel/10570/focus=10634
> 
> There is also an earlier stab on the problem in
> https://sourceforge.net/tracker/?func=detail&atid=312694&aid=2505488&group_id=12694
> 
> /MF
> 
> I think I will have to do a FAQ of this...
> 

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