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Re: [libvirt] Question about building libvirt.so



Thanks for the reply Cedric,

wrappers is a dir that I made similar to examples which wraps the libvirt c code. The reason why I am doing this is to simplify the usage of virConnectOpenAuth - it's arguments and callbacks from JavaScript. Using ffi, I am unable to create the right callbacks and have it pass the correct arguments.

I also followed a different approach of having my wrappers turned into a shared object (.so) and linking libvirt.so as a dependency.

My environment is esx requiring authentication.

Much appreciated,
Vik.

> On Feb 21, 2014, at 12:19 AM, Cedric Bosdonnat <cbosdonnat suse com> wrote:
> 
> Hello Vik,
> 
>> On Thu, 2014-02-20 at 15:14 -0800, vikhyath reddy wrote:
>> Thanks for libvirt. It is a life saver. I am in the process of writing
>> some custom wrappers for libvirt so that it can be easily accessed
>> from nodejs using the nodejs-ffi interfacing (basically describes a
>> way to convert nodejs to c calls). I did write the wrapper on the
>> lines of the examples provided. But I am unable to see my new
>> functions in the libvirt.so file (which nodejs interfacing needs).
>> Which means that my wrappers under <libvirt>/wrappers/ are not getting
>> into libvirt.so like the ones at <libvirt>/examples
> 
> I don't quite get what you are doing. Why would you need to modify
> libvirt to wrap it in a nodejs-based script? What is that
> libvirt/wrappers folder you are mentioning? there is no such thing in
> the libvirt repository.
> 
> From what I understood from the nodejs-ffi page, you should mostly write
> javascript code similar to this:
> 
> ------------ %< ------------
> 
> var ref = require('ref');
> var ffi = require('ffi');
> 
> var virConnect = ref.types.void;
> var virConnectPtr = ref.refType(virConnect);
> 
> var libvirt = ffi.Library('libvirt', {
> 'virInitialize': [ 'int', [ ] ],
> 'virConnectOpen': [virConnectPtr, [ string ]],
> ...
> });
> 
> ------------ %< ------------
> 
> I'm pretty sure generating this could be automated by a small program or
> script or even a clang plugin, using include/libvirt/libvirt.h.in as
> input.
> 
>> Can you please guide me as to where I am going wrong? I was able to do
>> a successful configure + make and I thought this will regenerate the
>> new libvirt.so (which it does, but I cant see my new wrapper methods
>> in it).
> 
> I case you really want to modify libvirt, then you should proceed as
> mentioned on this page:
> 
> http://libvirt.org/compiling.html
> 
> Regards,
> --
> Cedric
> 


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