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Diffstat (limited to 'src/Xmobar/Signal.hs')
-rw-r--r-- | src/Xmobar/Signal.hs | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/src/Xmobar/Signal.hs b/src/Xmobar/Signal.hs deleted file mode 100644 index bdc4be1..0000000 --- a/src/Xmobar/Signal.hs +++ /dev/null @@ -1,132 +0,0 @@ -{-# LANGUAGE DeriveDataTypeable, CPP #-} - ------------------------------------------------------------------------------ --- | --- Module : Signal --- Copyright : (c) Andrea Rosatto --- : (c) Jose A. Ortega Ruiz --- : (c) Jochen Keil --- License : BSD-style (see LICENSE) --- --- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org> --- Stability : unstable --- Portability : unportable --- --- Signal handling, including DBUS when available --- ------------------------------------------------------------------------------ - -module Xmobar.Signal where - -import Data.Foldable (for_) -import Data.Typeable (Typeable) -import Control.Concurrent -import Control.Concurrent.STM -import Control.Exception -import System.Posix.Signals -import Graphics.X11.Types (Button) -import Graphics.X11.Xlib.Types (Position) -import System.IO - -#ifdef DBUS -import DBus (IsVariant(..)) -import Control.Monad ((>=>)) -#endif - -import Xmobar.Plugins.Utils (safeHead) - -data WakeUp = WakeUp deriving (Show,Typeable) -instance Exception WakeUp - -data SignalType = Wakeup - | Reposition - | ChangeScreen - | Hide Int - | Reveal Int - | Toggle Int - | TogglePersistent - | Action Button Position - deriving (Read, Show) - -#ifdef DBUS -instance IsVariant SignalType where - toVariant = toVariant . show - fromVariant = fromVariant >=> parseSignalType -#endif - -parseSignalType :: String -> Maybe SignalType -parseSignalType = fmap fst . safeHead . reads - --- | Signal handling -setupSignalHandler :: IO (TMVar SignalType) -setupSignalHandler = do - tid <- newEmptyTMVarIO - installHandler sigUSR2 (Catch $ updatePosHandler tid) Nothing - installHandler sigUSR1 (Catch $ changeScreenHandler tid) Nothing - return tid - -updatePosHandler :: TMVar SignalType -> IO () -updatePosHandler sig = do - atomically $ putTMVar sig Reposition - return () - -changeScreenHandler :: TMVar SignalType -> IO () -changeScreenHandler sig = do - atomically $ putTMVar sig ChangeScreen - return () - - --- | Ensures that the given IO action runs its cleanup actions ('bracket' etc.), --- even if a signal is caught. --- --- An exception will be thrown on the thread that called this function when a --- signal is caught. -withDeferSignals :: IO a -> IO a -withDeferSignals thing = do - threadId <- myThreadId - caughtSignal <- newEmptyMVar - - let signals = - filter (not . flip inSignalSet reservedSignals) - [ sigQUIT - , sigTERM - --, sigINT -- Handler already installed by GHC - --, sigPIPE -- Handler already installed by GHC - --, sigUSR1 -- Handled by setupSignalHandler - --, sigUSR2 -- Handled by setupSignalHandler - - -- One of the following appears to cause instability, see #360 - --, sigHUP - --, sigILL - --, sigABRT - --, sigFPE - --, sigSEGV - --, sigALRM - --, sigBUS - --, sigPOLL - --, sigPROF - --, sigSYS - --, sigTRAP - --, sigVTALRM - --, sigXCPU - --, sigXFSZ - ] - - for_ signals $ \s -> - - installHandler s - (Catch $ do - tryPutMVar caughtSignal s - hPutStrLn stderr ("xmobar: Caught signal "++show s++"; exiting...") - throwTo threadId ThreadKilled) - Nothing - - thing `finally` do - s0 <- tryReadMVar caughtSignal - case s0 of - Nothing -> pure () - Just s -> do - -- Run the default handler for the signal - -- hPutStrLn stderr ("xmobar: Running default handler for signal "++show s) - installHandler s Default Nothing - raiseSignal s |