[erlang-patches] Fwd: [erlang-questions] SNMP AGENT-CAPABILITIES

Dmitriy Kargapolov <>
Thu Dec 2 17:54:59 CET 2010


It has been fixed. Please try again.
Thanks.

On Thu, Dec 2, 2010 at 11:34 AM, Niclas Axelsson <> wrote:

> On 12/01/2010 09:33 PM, Dmitriy Kargapolov wrote:
>
>> Patch proposed allowing to compile and use (in limited way - see below)
>> AGENT-CAPABILITIES macro in the MIBs.
>>
>> git fetch git://github.com/xoid/otp.git agent_capabilities
>>
>> Thanks.
>>
>> ---------- Forwarded message ----------
>> From: Dmitriy Kargapolov<>
>> Date: Wed, Dec 1, 2010 at 3:21 PM
>> Subject: Re: [erlang-questions] SNMP AGENT-CAPABILITIES
>> To: Martin Bjorklund<>
>> Cc: 
>>
>>
>> Hi Martin,
>>
>> On Wed, Dec 1, 2010 at 7:09 AM, Martin Bjorklund<>  wrote:
>>
>>
>>
>>> Hi,
>>>
>>> Dmitriy Kargapolov<>  wrote:
>>>
>>>
>>>> Trying to improve SNMP agent for some app written in Erlang, I found
>>>> that
>>>> Erlang MIB compiler does not support AGENT-CAPABILITIES statement which
>>>>
>>>>
>>> is
>>>
>>>
>>>> actually a macro from SNMPv2-CONF.
>>>>
>>>>
>>> Normally, an invocation of the AGENT-CAPABILITIES macro is specified
>>> in a separate document from the normal MIB modules.  It documents how
>>> a certain agent (or family of agents) conforms to a set of MIB
>>> modules.
>>>
>>>
>>>
>> Compiler is indifferent to the layout and AGENT-CAPABILITIES location. It
>> just did not recognize this construct.
>>
>>
>>
>>
>>> Do you mean that you want the MIB compiler to support this use case?
>>> If so, what exactly do you want the compiler to do?
>>>
>>>
>>>
>> In some (odd) cases you get files with both normal MIB modules, and an
>>
>>
>>> AGENT-CAPABILITIES invocation in the same file.  Is this the use case
>>> you want to support?
>>>
>>>
>>>
>> > From SNMP agent perspective, it is enough to register OID of the
>> AGENT-CAPABILITIES object, so I would later to use smpa:name_to_oid/1 to
>> resolve its name and snmpa/add_agent_caps/2 to add this OID to
>> sysORTable...
>> This is exactly what I implemented in my minimalistic patch.
>>
>> > From SNMP manager perspective it would be nice to have access to the
>> whole
>> content of the AGENT-CAPABILITIES construct. To make possible to decide
>> which part of features of agent have to be supported in manager at
>> runtime.
>> I understand that this task requires a bit more time (which I do not
>> have),
>> so its ok to leave this for future, if needed.
>>
>>
>>
>>
>>> I have modified the MIB compiler to "support" this macro.  The grammar
>>> builds a record of the information, and then the compiler ignores this
>>> record.  Some day I should make it available in git...
>>>
>>>
>>> /martin
>>>
>>>
>>>
>> I have published my changes to the branch agent_capabilities at git://
>> github.com/xoid/otp.git.
>>
>>
>>
> Hi Dmitriy,
>
> Your patch does not compile on my machine. Here is my output from the
> compilation:
>
> erlc -W  -o . -o. snmpc_mib_gram.yrl
> erlc -W  +debug_info -I../../include -Dversion=\"4.18\"
> +'{parse_transform,sys_pre_attributes}'
> +'{attribute,insert,app_vsn,"snmp-4.18"}' -I/otp/lib/stdlib -o../../ebin
> snmpc_mib_gram.erl
> erlc -W  +debug_info -I../../include -Dversion=\"4.18\"
> +'{parse_transform,sys_pre_attributes}'
> +'{attribute,insert,app_vsn,"snmp-4.18"}' -I/otp/lib/stdlib -o../../ebin
> snmpc.erl
> ./snmpc.erl:1022: function l/2 undefined
> make[3]: *** [../../ebin/snmpc.beam] Error 1
>
> Please check the error and when you have a solution, let me know.
> As it is now I can not include this patch into 'pu'.
>
> /Niclas Axelsson, Erlang/OTP
>
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