Daniel P. Berrange 3a80f2f7ce Ensure error handling callback functions are called from safe context
The virRaiseErrorFull() may invoke the error handler callback
functions an application has registered. This is not good
because the connection object may not be available at this
point, and the caller may be holding locks. This creates a
problem if the error handler calls back into libvirt.

The solutuon is to move invocation of the handler into the
final cleanup code in the public API entry points, where it
is guarenteed to have safe state.

* src/libvirt.c: Invoke virDispatchError() in all error paths
* src/util/virterror.c: Remove virSetConnError/virSetGlobalError,
  replacing with virDispatchError(). Move invocation of the
  error callbacks into virDispatchError() instead of the
  virRaiseErrorFull function which is not in a safe context
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         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>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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