Alternative proposal (was Plugin project proposal)

[Jeffrey Hutzelman]

--On Wednesday, July 21, 2010 12:44:40 PM -0500 Nicolas Williams 
<Nicolas.Williams at oracle.com> wrote:

>  - The framework itself provides just a few utility functions and
>    macros, as well as the build tools to generate header files from
>    plugin type definitions:
>
>     - a function to load a given plugin of a given plugin type
>     - a function to load all plugins of a given plugin type
>     - a macro to obtain the function pointer for a given entry point in
>       a given plugin of a given plugin type
>     - a macro to call a given entry point in a given plugin of a given
>       plugin type

I think you need some mechanism to enumerate all of the (loaded/enabled) 
plugins of a given type, possibly with a wrapper for calling the same entry 
point in each plugin until some appropriate result is returned.  For 
example, I'd expect to need such interfaces in building the open-by-name 
interfaces for keytabs and ccaches, where one would have to either give 
each plugin a chance to handle a name or else have built a mapping from 
schemes to plugin handles.


-- Jeff