[rrd-users] getting MAX, LAST VDEFs without generating graph from C library
tobi at oetiker.ch
Wed Feb 13 13:17:02 CET 2008
check out rrd_tool.c for inspiration
Today Jack Tavares wrote:
> Hello all
> I have some existing rrdfile with some data in them.
> I was reading about the VDEF capabilities of the rrdgraph
> I am using the c library functions to manipulate the rrd files.
> I want the MAX and LAST from a graph, but I don't want the graph.
> At the command line I would do:
> rrdtool graph xy.png -aPNG
> VDEF:connsmax=curclientconns,MAXIMUM VDEF:connslast=curclientconns,LAST
> PRINT:connslast:"last=%12.0lf" PRINT:connsmax:"max=%12.0lf"
> This prints to stdout.
> If I am calling rrd_graph() C function, how do I get this data?
> Is there a better way to do this? I m very open to suggestions, but I
> have to stick with the C library calls.
> Ok, one more question:
> I dont see any API docs for theC library on the web site. Are there any?
> Thanks again
> Jack Tavares
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902
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