[hobbit] No graph for negative clock offset

[Ward, Martin]

The code I referred to is the Hobbit code not the RRD stuff. Whilst RRD
may well allow negative numbers it looks like Hobbit is not coded
correctly to allow it, at least not the source code I am looking at. I
know that there is an unofficial patch for Hobbit but have no idea
whether the code I am looking at is this version or not, not if that
code has this same bug.
 
If you compiled your own Hobbit then you can follow these instructions
to modify the source:
----
Change to the Hobbit source directory.
Edit the hobbitd/rrd/do_ncv.c file.
Go to line 54, which looks like this:
                        l = val + strspn(val, "0123456789.");

Add a - after the . so it looks like this:
                        l = val + strspn(val, "0123456789.-");

Compile and install as per standard instructions.
----
 
|\/|artin

	-----Original Message-----
	From: Ralph Mitchell [mailto:ralphmitchell at gmail.com] 
	Sent: 28 July 2008 16:18
	To: hobbit at hswn.dk
	Subject: Re: [hobbit] No graph for negative clock offset
	
	
	Judging by the man page, negative values are OK.  The first
entry in the EXAMPLE section of "man rrdcreate" reads:
	
	          rrdtool create temperature.rrd --step 300 \
	             DS:temp:GAUGE:600:-273:5000 \
	             RRA:AVERAGE:0.5:1:1200 \
	             RRA:MIN:0.5:12:2400 \
	             RRA:MAX:0.5:12:2400 \
	             RRA:AVERAGE:0.5:12:2400
	
	         This sets up an RRD called temperature.rrd which
accepts one tempera-
	         ture value every 300 seconds. If no new data is
supplied for more than
	         600 seconds, the temperature becomes *UNKNOWN*.  The
minimum acceptable
	         value is -273 and the maximum is 5'000.
	
	Ralph Mitchell
	
	
	
	On Mon, Jul 28, 2008 at 9:24 AM, Ward, Martin
<Martin.Ward at colt.net> wrote:
	

		Funnily enough I am looking at the Hobbit code that
deals with RRD data
		at the moment. If you are using the NCV capabilities
then it looks like
		you can't have negative numbers. The generic NCV
(Number, Colon, Value)
		code looks for numbers only, no signs (somewhere near
line 70 in
		hobbitd/rrd/do_ncv.c):
		
		                       val = l + strspn(l, " \t");
		                       l = val + strspn(val,
"0123456789.");
		
		I have no idea if RRD is able to accept/store negative
values, but if it
		is, it should be a simple case of adding the + and -
characters to the
		last line listed above to make what you want possible.
		
		|\/|artin
		

		-----Original Message-----
		From: David Stuffle [mailto:david at stufflemail.com]
		Sent: 28 July 2008 14:28
		To: hobbit at hswn.dk
		Subject: [hobbit] No graph for negative clock offset
		
		
		Hi all,
		None of my clock offset graphs graph anything when the
clock offset from
		
		a host is a negative number.  Only positive number work.
Anyone having
		the same thing happen or know how to fix?
		
		I'm running a snapshot 4.3.0-0.20080103
		
		Thanks
		David
		
		
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The contents of this message and its attachments are confidential and may also be subject to legal privilege.  If you are not the named addressee and/or have received this message in error, please advise us by e-mailing security at colt.net and delete the message and any attachments without retaining any copies. 

Internet communications are not secure and COLT does not accept responsibility for this message, its contents nor responsibility for any viruses. 

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Please note that incoming emails will be automatically scanned to eliminate potential viruses and unsolicited promotional emails. For more information refer to www.colt.net or contact us on +44(0)20 7390 3900.

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