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34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
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Explanation about the how multi-version support
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for VirtualBox libvirt driver is implemented.
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Since VirtualBox adds multiple new features for each release, it is but
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natural that the C API which VirtualBox exposes is volatile across
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versions and thus needs a good mechanism to handle multiple versions
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during runtime. The solution was something like this:
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Firstly the file structure is as below:
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vbox_CAPI_v2_2.h
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vbox_XPCOMCGlue.h
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vbox_XPCOMCGlue.c
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These files are C API/glue code files directly taken from the
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VirtualBox OSE source and is needed for C API to work as expected.
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vbox_driver.h
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vbox_driver.c
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These files have the main logic for registering the virtualbox driver
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with libvirt.
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vbox_V2_2.c
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The file which has version dependent changes and includes the template
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file for given below for all of its functionality.
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vbox_tmpl.c
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The file where all the real driver implementation code exists.
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Now there would be a vbox_V*.c file (for eg: vbox_V2_2.c for V2.2) for
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each major virtualbox version which would do some preprocessor magic
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and include the template file (vbox_tmpl.c) in it for the functionality
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it offers.
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