Plugin Output

[Russell Scibetti]

I know the size limit when writing to the command pipe, but why does the 
same rule apply for plugins writing back to the daemon.  Why can't 
nagios be modified to handle a larger response from the plugin?  Does 
the same pipe limitation for external commands exist within the daemon?

Russell Scibetti

Jason Marshall wrote:

>>#define MAX_PLUGINOUTPUT_LENGTH            352
>>
>
>Russell, that value, plus 160 bytes of miscellanous stuff, equals 512
>bytes (that's not the interesting part).
>
>The interesting part is that's the max size for atomic read/write
>operations on a names pipe in Linux.
>
>On my Solaris Nagios box, it's 5120 for the same atomic operation size
>limitation, so I bumped up all the relevant stuff by 1024 bytes, and it
>works fine.
>
>I'm not sure where the perfdata would be carried in this case.  If it goes
>through the names pipe (probably), it may cause big problems if you're
>reading and writing to and from the command file in chunks bigger than 512
>bytes...
>
>Unfortunately, it's going to be hard to verify if there is (or isn't) a
>real problem, if you make the change.  You may end up with command-file
>commands being mangled, but maybe so infrequently that you could discount
>them...  Maybe...
>
>---
>Jason Marshall, Unix Geek, Kelman Technologies, Inc., Calgary, AB, Canada.
>
>  From a Sun Microsystems bug report (#4102680):
>    "Workaround: don't pound on the mouse like a wild monkey."
>
>  "I have great faith in fools: 
>     Self confidence my friends call it."  -Edgar Allan Poe
>
>
>
>
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-- 
Russell Scibetti
Quadrix Solutions, Inc.
http://www.quadrix.com
(732) 235-2335, ext. 7038


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