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{-# OPTIONS -fglasgow-exts -ffi #-}
module XCB(XCBConnection, XCBGenericError, connect, disconnect, withConnection) where
import Control.Exception
import CForeign
import Foreign
data XCBConnection
data XCBGenericError
foreign import ccall "X11/XCB/xcb.h XCBConnect" _connect :: CString -> Ptr CInt -> IO (Ptr XCBConnection)
foreign import ccall "X11/XCB/xcb.h XCBDisconnect" disconnect :: Ptr XCBConnection -> IO ()
connect display = withCString display (\displayPtr -> alloca (\screenPtr -> do
c <- throwIfNull "connect failed" $ _connect displayPtr screenPtr
screen <- peek screenPtr
return (c, fromEnum screen)
))
withConnection display = bracket (connect display) (disconnect . fst) . uncurry
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