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[–] Devac ago 

Here is a rather good project/tutorial describing universal copy/paste and basics of primary selections use along with XConvertSelection(). I hope that it helps.

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[–] effusive_ermine ago 

Not sure how much this helps: https://bazaar.launchpad.net/~ubuntu-branches/ubuntu/vivid/xsel/vivid/files

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[–] NervousHorse [S] ago 

It's probably in there somewhere.