On Wed, Aug 12, 2015 at 01:49:46PM +0200, Guido Günther wrote:
> On Wed, Aug 12, 2015 at 11:15:58AM +0100, Daniel P. Berrange wrote:
> > On Tue, Aug 11, 2015 at 09:24:59PM +0200, Guido Günther wrote:
> > > Otherwise we're leaking some 30+ symbols like
> > >
> > > virAdmConnectClass
> > > virAdmConnectNew
> > > virConnectClass
> > > virConnectCloseCallbackDataClass
> > > virDomainClass
> > > ...
> > >
> > > I marked the one symbol needed by the deamon as
> > > LIBVIRT_ADMIN_PRIVATE_<VERSION> for now.
> >
> > How are you identifying those as leaked ?
>
> I tripped on this by dpkg-gensymbols[1] which uses objdump.
>
> objdump -w --dynamic-syms src/.libs/libvirt-admin.so | grep " g "
>
> The g meaning global visibility. A similar result can be achieved with
> "nm -D".
>
> > IIRC, exports are those symbols marked with 'T' in the nm
> > output:
> >
> > [man nm]
> > · The symbol type. At least the following types are used;
> > others are, as well, depending on the object file format.
> > If lowercase, the symbol is usually local; if uppercase,
> > the symbol is global (external). There are however a few
> > lowercase symbols that are shown for special global
> > symbols ("u", "v" and "w").
> >
> > "T"
> > "t" The symbol is in the text (code) section.
> > [/man]
> >
> > # nm -a .libs/libvirt-admin.so | grep ' T '
> > 0000000000001c80 T virAdmConnectClose
> > 00000000000017d0 T virAdmConnectOpen
> > 0000000000001d30 T virAdmConnectRef
> >
> > # nm -a .libs/libvirt-admin.so | grep virAdmConnectNew
> > 00000000000037c0 t virAdmConnectNew
> >
> > So, IIUC, that lowercase 't' means the symol is local, and
> > exported.
>
> I'm seeing
>
> 0000000000003f00 T virAdmConnectNew
>
> so this is consistent with the above but different from what you're
> seeing. This binutils 2.25 in case this matters. I think having a
>
> local:
> *;
>
> Is a good think to have in any case.
Yeah, that's probably right. BTW, can you check libvirt-lxc.so and
libvirt-qemu.so too as they don't have the 'local: *' bit in their
syms files either AFAICT.
Regards,
Daniel
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