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<p class=MsoNormal><span lang=EN-US>hi!<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>create a rrd database with the following
statement:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>#!/bin/sh<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>start=`date +'00:00 %m/%e/%Y'`<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>/usr/bin/rrdtool create $1.rrd \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> --start "$start" \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> --step 300 \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> DS:total:GAUGE:600:0:U \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> DS:new:GAUGE:600:0:U \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> RRA:LAST:0.5:1:288 \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> RRA:LAST:0.5:12:720 \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> RRA:LAST:0.5:288:37200 \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> RRA:AVERAGE:0.5:1:288 \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> RRA:AVERAGE:0.5:12:720 \<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> RRA:AVERAGE:0.5:288:37200<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>when fetch data between several days with rrd_fetch,
rrd_fecth will crash. gdb the core file, finally I found that there is a overflow
in rrd_fetch.c. here is the patch<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>[CODE]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>diff -Nur
rrdtool-1.3.4/rrdtool-1.3.4/src/rrd_fetch.c
rrdtool-1.3.4_/rrdtool-1.3.4/src/rrd_fetch.c<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>---
rrdtool-1.3.4/rrdtool-1.3.4/src/rrd_fetch.c Sun
Oct 5 00:04:04 2008<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>+++
rrdtool-1.3.4_/rrdtool-1.3.4/src/rrd_fetch.c Tue Nov 25 16:55:04
2008<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>@@ -345,7 +345,7 @@<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> rra_start_time =
(rra_end_time<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
- (*step * (rrd.rra_def[chosen_rra].row_cnt - 1)));<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> /* here's an error
by one if we don't be careful */<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>- start_offset = (long)
(*start + *step - rra_start_time) / (long) *step;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>+ start_offset =
(long)(((double)(*start)/(long)*step) + 1 -
((double)(rra_start_time)/(long)*step));<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> end_offset =
(long) (rra_end_time - *end) / (long) *step;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> #ifdef DEBUG<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> fprintf(stderr,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>[/CODE]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>--<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>zou guangxian <o:p></o:p></span></p>
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