Thanks Eric! This was exactly what I was looking for.
On Fri, Dec 20, 2013 at 11:48 AM, Eric Blake <ebl...@redhat.com> wrote: > On 12/20/2013 11:45 AM, Mark Trinh wrote: > > I'm currently running: > > virsh --version > > 1.0.2 > > > > libvirtd --version > > libvirtd (libvirt) 1.0.2 > > > > I have a couple questions. > > > > 1. Can I upgrade my libvirt.so version to use with an older libvirtd? In > > other words, does the versions of libvirt and libvirtd need to be in lock > > step? > > No, they do not have to be in lockstep. libvirt.so communicates to a > local libvirtd the same way it communicates to a remote machine, and we > took great care in the design to ensure that things error out nicely if > the libvirt.so client is newer than the remote server; conversely, if > the client is older, the changes have always been back-compat so that a > newer server will always talk to the client correctly (although the > client being older means that you can't take full advantage of the server). > > > > > > > 2. I'm able to use virsh blockcopy, but I want to do it programmatically > > via C. I looked through the API and was not able to see any references > to > > that. I did see mention of virDomainBlockCopy on the TIP of the git > > repository, but no other references to it. > > The source code to virsh shows the APIs that we used; this is a good > starting point for any other C binding, and also for any other language > binding if you can map the C bindings over to your language bindings. > In particular, tools/virsh-domain.c:cmdBlockCopy() is currently > implemented atop the virDomainBlockRebase() API call with the > VIR_DOMAIN_BLOCK_REBASE_COPY flag (but the door is open to also > implement it atop a newer more-powerful virDomainBlockCopy() once we > start targetting some of qemu 1.7 or 2.0's newer features). > > -- > Eric Blake eblake redhat com +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > >
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