libvirt users - Apr 2012 - [API reference] Are there XML-handling API to retrieve info directly from xml configure file

Hi, everyone

    I'm writing a application using libvirt and need to query guest
os's virtual network interface usage, like bytes read or written
through a given interface. I know int
virDomainInterfaceStats(virDomainPtr dom, const char * path,
		virDomainInterfaceStatsPtr stats,  size_t size) is designed for my
purpose but I 'm not sure how I determine the second parameter path.
I'm now think of determining the virtual interface by parsing the
domain's xml configure file.
But I don't find that libvirt  supply such functions, that means, I
have to resort to other library lik libxml?

thanks

On 04/06/2012 01:24 AM, Zhihua Che wrote:
> Hi, everyone
> 
>     I'm writing a application using libvirt and need to query guest
> os's virtual network interface usage, like bytes read or written
> through a given interface. I know int
> virDomainInterfaceStats(virDomainPtr dom, const char * path,
> 		virDomainInterfaceStatsPtr stats,  size_t size) is designed for my
> purpose but I 'm not sure how I determine the second parameter path.
> I'm now think of determining the virtual interface by parsing the
> domain's xml configure file.
> But I don't find that libvirt  supply such functions, that means, I
> have to resort to other library lik libxml?
You may be interested in the libvirt-glib project, which includes the
libvirt-gconfig subpackage to provide an API on top of libvirt for more
convenient access into domain XML:

https://www.redhat.com/archives/libvirt-announce/2012-March/msg00004.html

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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On Fri, Apr 06, 2012 at 03:24:25PM +0800, Zhihua Che
wrote:
> Hi, everyone
> 
>     I'm writing a application using libvirt and need to query guest
> os's virtual network interface usage, like bytes read or written
> through a given interface. I know int
> virDomainInterfaceStats(virDomainPtr dom, const char * path,
> 		virDomainInterfaceStatsPtr stats,  size_t size) is designed for my
> purpose but I 'm not sure how I determine the second parameter path.
> I'm now think of determining the virtual interface by parsing the
> domain's xml configure file.
> But I don't find that libvirt  supply such functions, that means, I
> have to resort to other library lik libxml?
I would also really like to see such an API/APIs in the basic
libvirt API.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines.  Supports shell scripting,
bindings from many languages.  http://libguestfs.org