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Previously virStorageBackendCopyToFD would simply return -1 on error. This made the error return from one of its callers inconsistent (createRawFileOpHook is supposed to return -errno, but if virStorageBackendCopyToFD failed, createRawFileOpHook would just return -1). Since there is a useful errno in every case of error return from virStorageBackendCopyToFD, and since the other uses of that function ignore the return code (beyond simply checking to see if it is < 0), this is a safe change.
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>