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To prevent assigning one USB device to two domains, we keep a list of assigned USB devices. On domain startup - qemuProcessStart() - we insert devices used by domain into the list but remove them only on detach-device. Devices are, however, released on qemuProcessStop() as well.
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>