[rrd-developers] rrd_fetch seek issue

Tobias Oetiker tobi at oetiker.ch
Thu Dec 11 14:56:05 CET 2008

Hi Daniel,

Today Daniel.Pocock at barclayscapital.com wrote:

> > note that there is code to wrap the rra_pointer back to the
> > start of the archive once it ventures over the end of the archive ...
> >
> >             if (rra_pointer >= (signed)
> > rrd.rra_def[chosen_rra].row_cnt) {
> >                 rra_pointer -= rrd.rra_def[chosen_rra].row_cnt;
> It doesn't get that far - the problem occurs in the first seek, where
> r1689 corrected the other issue

ah because of the +1 ... :-)

so does

Index: rrd_fetch.c
--- rrd_fetch.c (revision 1703)
+++ rrd_fetch.c (working copy)
@@ -390,6 +390,8 @@
             rra_pointer = rrd.rra_ptr[chosen_rra].cur_row + 1 + start_offset;

+        rra_pointer = rra_pointer % (signed) rrd.rra_def[chosen_rra].row_cnt;
         if (rrd_seek(rrd_file, (rra_base + (rra_pointer * (*ds_cnt)
                                         * sizeof(rrd_value_t))),
                  SEEK_SET) != 0) {

help ?


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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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