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A later patch will be adding a counter that will be incremented/decremented each time an guest interface starts/stops using a particular network. For this to work, all types of networks need to go through a common return sequence rather than returning early. To setup for this, a new success: label is added (when necessary), a new error: label is added which does any cleanup necessary only for error returns and then does goto cleanup, and early returns are changed to goto error if it's a failure, or goto success if it's successful. This way the intent of all the gotos is unambiguous, and a successful return path never encounters the "error:" label.
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>