Re: sysUptime uses gettimeofday

Thank you Magnus Fromreide, Anders Wallin and Stuart Henderson for the
reply.

Stuart Henderson,

I am using net-snmp.5.7.1.  Object sysUpTime uses API
netsnmp_get_agent_uptime() and they inturn uses gettimeofday().
If time on device changes after snmpd starts then sysUpTime value is
confusing.

Scenario:
1. Linux device time is  'Mon Aug 28 21:01:29 UTC 2017'
2. start snmpd
3.Now  sysUptime = 4 seconds
4. Set linux device time 'Mon Mar 26 05:53:07 UTC 2018'
5. sysUptime = 209 days  <------ This is not correct in this scenario.

Thank you,
Pushpa.T


On Fri, Mar 30, 2018 at 2:01 PM, Stuart Henderson <[email protected]>
wrote:

> In gmane.network.net-snmp.devel, you wrote:
> > I believed that sysUpTime is counter that increments  every seconds. But
> In
> > net-snmp code ,
> >  sysUpTime being calculated as difference between 'snmpd-starttime' and
> > 'current time' .
> >
> > I would like to know reason for sysUpTime been calculated as difference
> in
> > time instead of incremental-counter.
> > Is there any constraints ?
>
> Which version are you looking at? net-snmp has been using clock_gettime
> with (incremental) CLOCK_MONOTONIC for sysUptime for about 6 years.
>
>

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