[rrd-users] C API for rrdtool

[Fizza Hussain]

Hi!

I have written a C program which use RRD C API functions rrd_create(),
rrd_update() and rrd_dump() to create, update and show the contents of the
RRD database. I want to fill the RRD database with the integers returned by
C rand( ) function i.e. the random value generated by the rand( ) function
is stored against each timestamp.

Below is my code snippet:

char *updateparams[] = {
       "rrdupdate",
       "Flow1bytes.rrd",
       "???:Bytecounter[i]",
       NULL
    };


for (i=0; i < 50; i++)
{
flow1.bytes= rand();
Bytecounter[i]=flow1.bytes;
rrd_update(3,updateparams);
}

Please guide me how can I access the timestamp variable and write it in the
update parameter at the place marked by ???.

The code for creating the Flow1bytes.rrd database is this:

char *createparams[] = {
       "rrdcreate",
       "Flow1bytes.rrd",
       "--step=1",
       "DS:Bytecounter:COUNTER:1000:0:800",
       "RRA:AVERAGE:0.5:1:50",
       NULL
    };

rrd_create(5, createparams);


Thank you.



On Thu, Nov 28, 2013 at 11:01 AM, Fizza Hussain <12mseefhussain at seecs.edu.pk
> wrote:

> Thank you so much Petteri for your help..
>
> I am definitely going to try this out..
>
>
> On Thu, Nov 28, 2013 at 12:43 AM, Petteri Matilainen <pmatil at gmail.com>wrote:
>
>> On 27.11.2013 13:12, Fizza Hussain wrote:
>> > Hi,
>> >
>> > I want to create and update the RRD database from a C code. For that
>> > purpose, I have included rrd.h file in my source code and have linked
>> > the C code against librrd library. These two steps are done perfectly.
>> > However, I am facing some difficulties in figuring out what arguments
>> > should I provide to the functions provided by C API? For example,
>> > rrd_create( ) function takes an int and a char string as its arguments.
>> > i.e. {int rrd_create(int , char **)}.
>> >
>> >
>> > I have previously used rrdtool via CLI and am comfortable with its CLI
>> > commands rrdtool create test.rrd --start 90234 (and so on). Please guide
>> > me what should be the arguments to the rrd_create( ) function provided
>> > by C API.
>> >
>> >
>> >
>> > Thanks,
>> >
>> > Fizza Hussain
>> >
>> >
>> > _______________________________________________
>> > rrd-users mailing list
>> > rrd-users at lists.oetiker.ch
>> > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
>> >
>>
>> Hi Fizza,
>>
>> The create function takes only 2 arguments: the count and the array of
>> pointers to the arguments. Among the first links in google I found this
>> example: http://permalink.gmane.org/gmane.comp.db.rrdtool.devel/894
>> There's an example on how to use the create function and many others.
>> Note that the examples are for an older version of rrdtool so you may
>> have to modify the code.
>>
>> regards,
>>
>> Pete
>>
>>
>> _______________________________________________
>> rrd-users mailing list
>> rrd-users at lists.oetiker.ch
>> https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
>>
>
>
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