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Although highly unlikely, nobody says that virEventAddHandle() can't return 0 as a handle to socket callback. It can't happen with our default implementation since all watches will have value 1 or greater, but users can register their own callback functions (which can re-use unused watch IDs for instance). If this is the case, weird things may happen. Also, there's a little bug I'm fixing too, upon virNetSocketRemoveIOCallback(), the variable holding callback ID was not reset. Therefore calling AddIOCallback() once again would fail. Not that we are doing it right now, but we might. Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>