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The function is expected to return negative value on failure, however, it returns positive value when either setInterfaceName or vethInterfaceUpOrDown fails. Because the function returns the return value of either as is, however, the two functions may return positive value on failure. The patch fixes the defects and add error messages.
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>