[rrd-users] strange r_graph problem - Segmentation fault without cout-output

[guest01]

Hi!

I have a very strange problem regarding the r_graph function of rrdtool 1.2.11.

I have to generate a rrd-graphic, but it behavior is very very strange
... I wrote following function:

int cmm_graph_rrdfile(char archivename[255], char outputname[255]) {
       char *r_graph[21];
       char def[1][255];
       char ***calcpr;
       FILE* stream;
       int xsize,ysize,i;
       double ymin,ymax;

       sprintf(def[0],"DEF:myspeed=%s.rrd:speed:AVERAGE",archivename);

       r_graph[0]="graph";
       r_graph[1]=outputname;
       r_graph[2]="--start";
       r_graph[3]="920804400";
       r_graph[4]="--end";
       r_graph[5]="920808000";
       r_graph[6]="--height";
       r_graph[7]="500";
       r_graph[8]="--width";
       r_graph[9]="1500";
       r_graph[10]="--vertical-label";
       r_graph[11]="km/h";
       r_graph[12]=def[0];
       r_graph[13]="CDEF:kmh=myspeed,3600,*";
       r_graph[14]="CDEF:fast=kmh,100,GT,kmh,0,IF";
       r_graph[15]="CDEF:over=kmh,100,GT,kmh,100,-,0,IF";
       r_graph[16]="CDEF:good=kmh,100,GT,0,kmh,IF";
       r_graph[17]="HRULE:100#0000FF:Maximumallowed";
       r_graph[18]="AREA:good#00FF00:Goodspeed";
       r_graph[19]="AREA:fast#550000:Toofast";
       r_graph[20]="STACK:over#FF0000:Overspeed";

       /*for (i = 0;i<21;i++) {
               cout << i << ": " << r_graph[i] << endl;
       }*/

       if (rrd_graph(20,r_graph,calcpr,&xsize,&ysize,stream,&ymin,&ymax)!=-1) {
               cout << "Done generating graphic ... " << endl;
               return 0;
       }else {
               cout << "Problem generating graphic ... " << endl;
               return -1;
       }
}

If I use this function, I get a "Segmentation fault".
If I comment in the following part of the function:

       for (i = 0;i<21;i++) {
               cout << i << ": " << r_graph[i] << endl;
       }
the function works -> "Done generating graphic ..."

So, in my opinion, this is a very strange behavior which I totally
cannot understand ... Please can someone explain to me how a simple
stdout-command can affect that??

Thanxs!

By the way, wtf do I need the last 6 parameters
(calcpr,&xsize,&ysize,stream,&ymin,&ymax) from rrd_graph? There is no
documentation or anything similar ...

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