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If a uid and/or gid is specified for a command, it will be set just after the user-supplied post-fork "hook" function is called. The intent is that this can replace user hook functions that set uid/gid. This moves the setting of uid/gid and dropping of capabilities closer to each other, which is important since the two should really be done at the same time (libcapng provides a single function that does both, which we will be unable to use, but want to mimic as closely as possible).
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>