[Olsr-dev] NL80211 link quality patch and GIT repository

Henning Rogge (spam-protected)
Fri Jul 13 23:07:59 CEST 2012

A nl80211 based plugin would not be feasible on non linux-systems anyways.


On Fri, Jul 13, 2012 at 7:46 PM, Hans-Christoph Steiner
<(spam-protected)> wrote:
> If you do end up adding libnl support, I would recommend using as
> specific macros as possible.  It sounds like __linux__ is much too
> general.  GNU/Linux and Android both define __linux__, for example, and
> it really means "depends on the Linux kernel".  You might consider
> __gnu_linux__ if libnl isn't feasible on Android.
> So for libnl, ideally there would be a macro for libnl, so people who
> don't have the libnl headers but are building on GNU/Linux would not
> have issues.
> .hc
> On 07/09/2012 03:49 PM, Kees-Jan Hermans wrote:
>> Well,
>> to be precise, I encountered two recent versions of Debian where one
>> would have all userland wireless functionality in libnl, and it would
>> have API-version #defines (CONFIG_LIBNL20 and CONFIG_LIBNL30), and one
>> that had that library completely split up (in libnl, libnl-nf,
>> libnl-cli, libnl-route, libnl-genl), and none of those #defines. So I
>> thought, I'd approach this in the following manner:
>> 1) Our patch currently only works on Linux (so WIN32 and BSD would have
>> to have some elegant message saying 'Sorry, you can't use this right
>> now' - this is going to be solved in the code by a '#ifdef __linux__',
>> but in the makefile I'd need to be able to switch on the fact that we're
>> using Linux or not (I think I've seen a few instances of that in the
>> Makefiles already), in order to determine whether or not it's going to
>> run the script at all.
>> 2) Upon discovery of a few Linux NL-quirks by the script, either a
>> Makefile inclusion file is produced, or the present Makefile is altered,
>> whichever has your preference (the former has the advantage that running
>> the script doesn't alter the GIT state of the present Makefile).
>> In the absence of a proper 'configure' script, this is the only elegant
>> solution I could think of.
>> KJ
>> On Mon, 2012-07-09 at 15:17 -0400, Hans-Christoph Steiner wrote:
>>> Sure, that's possible with make, which headers and functions are you talking about?
>>> My guess is that most likely, you'll want to use #ifdef macros.
>>> .hc
>>> On Jul 9, 2012, at 11:32 AM, Kees-Jan Hermans wrote:
>>>> Ok, thanks. Turns out that what I thought was new, was old, and vice
>>>> versa. Spent some of the weekend adapting a patch against the old code.
>>>> My mistake I suppose - teach me the basics of this here project ;-)
>>>> Anyway, some patching up was necessary anyhow (mostly, unfortunately,
>>>> due to the fact that there is no stable nl80211 userland API on Linux,
>>>> differing wildly among distributions and no real sure way to know what
>>>> version you're dealing with on the basis of #defines and whatnot)
>>>> Which leads me to another question: is there something in the course of
>>>> 'make' that I could use to create a 'configure' like situation
>>>> (discovery of certain uses of header files, function prototypes and
>>>> defines) ?
>>>> Sincerely,
>>>> KJ
>>>> On Mon, 2012-07-09 at 16:49 +0200, Henning Rogge wrote:
>>>>> On 07/09/2012 04:45 PM, Kees-Jan Hermans wrote:
>>>>>> Dear all,
>>>>>> I've been working on renewing the patch for using wireless lan metrics
>>>>>> as part of the link quality cost calculation, but I've been a bit
>>>>>> confused as to how the repository works; it seems that the default
>>>>>> 'master' branch is old, and the 'stable' branch is where everyone is
>>>>>> committing their new code against. Is that correct? I'm just asking,
>>>>>> because in other places, such nomenclature would suggest a different,
>>>>>> and opposite, function.
>>>>> Yes, thats right.
>>>>> We were also in the process of discussing a change in the "where to
>>>>> commit and how to do it" policy here when I got hit by an "eat up a
>>>>> whole week of time" thing...
>>>>> Hope we will restart the discussion soon and sort it out.
>>>>> Henning
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