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With Mac OS X 10.9, xdrproc_t is no longer defined as: typedef bool_t (*xdrproc_t)(XDR *, ...); but instead as: typdef bool_t (*xdrproc_t)(XDR *, void *, unsigned int); For reference, Linux systems typically define it as: typedef bool_t (*xdrproc_t)(XDR *, void *, ...); The rationale explained in the header is that using a vararg is incorrect and has a potential to change the ABI slightly do to compiler optimizations taken and the undefined behavior. They decided to specify the exact number of parameters and for compatibility with old code decided to make the signature require 3 arguments. The third argument is ignored for cases that its not used and its recommended to supply a 0.
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>