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Running an instance of the router advertisement daemon (radvd) allows guests using the virtual network to automatically acquire an IPv6 address and default route. Note that acquiring an address only works for networks with a prefix length of exactly 64 - radvd is still run in other circumstances, and still advertises routes, but autoconf will not work because it requires exactly 64 bits of address info from the network prefix. This patch avoids a race condition with the pidfile by manually daemonizing radvd rather than allowing it to daemonize itself, then creating our own pidfile (in addition to radvd's own file, which is unnecessary, but there is no way to tell radvd to not create it). This is accomplished by exec'ing it with "--debug 1" in the commandline, and using virCommand's features to fork, create a pidfile, and detach from the newly forked process.
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>