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Until now, virNetlinkCommand has assumed that the nl_pid in the source address of outgoing netlink messages should always be the return value of getpid(). In most cases it actually doesn't matter, but in the case of communication with lldpad, lldpad saves this info and later uses it to send netlink messages back to libvirt. A recent patch to fix Bug 816465 changed the order of the universe such that the netlink event service socket is no longer bound with nl_pid == getpid(), so lldpad could no longer send unsolicited messages to libvirtd. Adding src_pid as an argument to virNetlinkCommand() is the first step in notifying lldpad of the proper address of the netlink event service socket.
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>