[rrd-users] Multiple, similar calls to rrd_fetch() returns different data sets

[Martin Fejrskov Pedersen]

Hi!
 I'm using the rrd_fetch C API to fetch data from an RRD archive. My
problem is, that similar, subsequent calls to rrd_fetch return different
results using the following code snippet:

  time_t        start,end;
  rrd_value_t   *datatmp;
  unsigned long step, ds_cnt,i;
  char          **ds_namv;
  char          parameter[7][255];
  char          *parampointer[7];
  strcpy(parampointer[0]=parameter[0],"fetch");
  strcpy(parampointer[1]=parameter[1],"--start");
  strcpy(parampointer[2]=parameter[2],"1084961940");
  strcpy(parampointer[3]=parameter[3],"--end");
  strcpy(parampointer[4]=parameter[4],"1084962480"); 
  sprintf(parampointer[5]=parameter[5],"%s",rrdfilename);
  strcpy(parampointer[6]=parameter[6],"AVERAGE");
  if(rrd_fetch(7, (char
**)parampointer,&start,&end,&step,&ds_cnt,&ds_namv,&datatmp) != -1)

The first time rrd_fetch is called, the data between the described
timestamps are returned correctly. The second time rrd_fethc is called,
the data from an entire day is returned. Furthermore, the timestamps are
completely ignored, because it is the data between "now" and 24 hours
back in time.

Is this a bug or is it intentional? If the latter, how do I make it
behave properly? Btw. this bug is reproducible using the code from
rrdtool.c....

Thanks in advance!


Martin Fejrskov
Student at Aalborg University, Denmark

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi