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The event is emitted on ACPI OSPM Status Indication events. ACPI standard documentation describes the method as: This object is an optional control method that is invoked by OSPM to indicate processing status to the platform. During device ejection, device hot add, or other event processing, OSPM may need to perform specific handshaking with the platform. OSPM may also need to indicate to the platform its inability to complete a requested operation; for example, when a user presses an ejection button for a device that is currently in use or is otherwise currently incapable of being ejected. In this case, the processing of the ACPI Eject Request notification by OSPM fails. OSPM may indicate this failure to the platform through the invocation of the _OST control method. As a result of the status notification indicating ejection failure, the platform may take certain action including reissuing the notification or perhaps turning on an appropriate indicator light to signal the failure to the user.
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>