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This allows to implement libvirt functions that use streams, such as virDoaminScreenshot, without the need to store the downloaded data in a temporary file first. The stream driver directly interacts with libcurl to send and receive data. The driver uses the libcurl multi interface that allows to do a transfer in multiple curl_multi_perform() calls. The easy interface would do the whole transfer in a single curl_easy_perform() call. This doesn't work with the libvirt stream API that is driven by multiple calls to the virStreamSend() and virStreamRecv() functions. The curl_multi_wait() function is used to do blocking operations. But it was added in libcurl 7.28.0. For older versions it is emulated using the socket callback of the multi interface. The current driver only supports blocking operations. There is already some code in place for non-blocking mode but it is not complete.
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>