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The error reporting code will invoke a callback when any error is raised and the default callback will print to stderr. The virRaiseErrorFull method also sends all error messages on to the logging code, which also prints to stderr by default. To avoid duplicated data on stderr, the logging code has some logic to skip emission when no log outputs are configured, which checks whether the virLogSource == VIR_LOG_FROM_ERROR. Meanwhile the libvirtd daemon can register another callback which is used to reduce log message priority from error to a lower level. When this is used we do want messages to end up on stderr, so the error code will conditionally use either VIR_LOG_FROM_FILE or VIR_LOG_FROM_ERROR depending on whether such a callback is provided. This will all complicate later refactoring. By pushing the checks for whether a log output is present up a level into the error code, the special cases can be isolated in one place. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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>