[rrd-developers] Re: Are multiple calls to rrd lib in the same execution supported ?

[Burton at ntopSupport.com]

(It's discussed in the back traffic on this list)  You usually have to
force/reset the optxxx variables between calls, e.g.:

  optind=0; /* reset gnu getopt */
  opterr=0; /* no error messages */

-----Burton  

-----Original Message-----
From: rrd-developers-bounce at list.ee.ethz.ch
[mailto:rrd-developers-bounce at list.ee.ethz.ch] On Behalf Of Olivier
Smeesters
Sent: Tuesday, May 03, 2005 2:35 AM
To: rrd-developers at list.ee.ethz.ch
Subject: [rrd-developers] Are multiple calls to rrd lib in the same
execution supported ?

Hi all,

I'm trying to write a wrapper around librrd that would allow me to execute
several rrd create/update requests in one single process.
The goal is to be able to create/update several RRD files in a single
process (single fork/exec).

When trying to call rrd_create twice, only the first call is correctly
handled.
Strangely the parameters of the second call are interpreted in the wrong
order.

For example:
# ./build/obj/rrdctl create test.rrd --start 920804400
DS:speed:COUNTER:600:U:U RRA:AVERAGE:0.5:1:24 RRA:AVERAGE:0.5:6:10 \
                       create test2.rrd --start 920804401
DS:speed:COUNTER:600:U:U RRA:AVERAGE:0.5:1:24 RRA:AVERAGE:0.5:6:10 Calling
"rrd_create with create test.rrd --start 920804400 DS:speed:COUNTER:600:U:U
RRA:AVERAGE:0.5:1:24 RRA:AVERAGE:0.5:6:10"
Returns 0 Success
Calling "rrd_create with create test2.rrd --start 920804401
DS:speed:COUNTER:600:U:U RRA:AVERAGE:0.5:1:24 RRA:AVERAGE:0.5:6:10"
Returns 0 Success

# ls
920804401  test.rrd

Clearly the first file has been created properly but for the second, the
parameters are not handled as expected.

Looking further deep in the existing rrd_wrapper code, I found the following
two lines:
>		optind=0; /* reset gnu getopt */
>		opterr=0; /* no error messages */

I copied them in my code and found that now it works.
Was this an expected behaviour ?
Any thought about this ?

Thanks,


Olivier Smeesters

--
Olivier Smeesters
Software Engineer

OCTALIS S.A.
Avenue Albert Einstein 2A
B - 1348 Louvain la Neuve
T: 010 45 68 21  F: 010 45 57 29
www.octalis.com



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