[rrd-users] rrd_update_r() error : expected timestamp not found in data source from update

Tony Mountifield tony at mountifield.org
Mon Dec 21 11:22:54 CET 2015

In article <CADgchnuMGkA=tQdMtACMWPYX2TgDUwKfbf3g=d+Fa3V5BP+WDA at mail.gmail.com>,
Athanasios Silis <athanasios.silis at gmail.com> wrote:
> Hello there,
> I am trying to use rrd_update_r() to update a rrdb through a c++ program.
> So I am generating the argc/argv on the fly to pass into the function.
> The originating string is the following:
>         time_t tm = time(NULL);
>         stringstream ss;
>         ss << tm;
>         string updstr = string("update sensors.rrd \
>                 --template CO2unf:CO2fil:O2pp:O2pct:O2temp:O2pres ")\
>                 + ss.str() + string(":1015:1000:123:20.63:38.48:987");
> I get this error  from rrd_get_error():
> sensors.rrd: expected timestamp not found in data source from update
> Is timestamp not accepted in seconds from EPOCH?

Can you show your code all the way from the above until the call to rrd_update_r()?

Also, show the value of updstr, to make sure it is what you think it is?

Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org

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