module GHC.ConsoleHandler
#if !defined(mingw32_HOST_OS) && !defined(__HADDOCK__)
- where
-import Prelude -- necessary to get dependencies right
+ where
#else /* whole file */
- ( Handler(..)
- , installHandler
- , ConsoleEvent(..)
- , flushConsole
- ) where
+ ( Handler(..)
+ , installHandler
+ , ConsoleEvent(..)
+ , flushConsole
+ ) where
{-
-#include "Signals.h"
+#include "rts/Signals.h"
-}
-import Prelude -- necessary to get dependencies right
-
import Foreign
import Foreign.C
-import GHC.IOBase
+import GHC.IO.FD
+import GHC.IO.Exception
+import GHC.IO.Handle.Types
+import GHC.IO.Handle.Internals
import GHC.Conc
-import GHC.Handle
+import Control.Concurrent.MVar
import Data.Typeable
-import Control.Concurrent
+
+#ifdef mingw32_HOST_OS
+import Data.Maybe
+import GHC.Base
+import GHC.Num
+import GHC.Real
+#endif
data Handler
= Default
-- it in one of these environments.
--
installHandler :: Handler -> IO Handler
-installHandler handler
+installHandler handler
| threaded =
modifyMVar win32ConsoleHandler $ \old_h -> do
- (new_h,rc) <-
+ (new_h,rc) <-
case handler of
Default -> do
r <- rts_installHandler STG_SIG_DFL nullPtr
Catch h -> do
r <- rts_installHandler STG_SIG_HAN nullPtr
return (h, r)
- prev_handler <-
+ prev_handler <-
case rc of
STG_SIG_DFL -> return Default
STG_SIG_IGN -> return Ignore
STG_SIG_HAN -> return (Catch old_h)
+ _ -> error "installHandler: Bad threaded rc value"
return (new_h, prev_handler)
| otherwise =
alloca $ \ p_sp -> do
- rc <-
+ rc <-
case handler of
Default -> rts_installHandler STG_SIG_DFL p_sp
Ignore -> rts_installHandler STG_SIG_IGN p_sp
Catch h -> do
v <- newStablePtr (toHandler h)
- poke p_sp v
- rts_installHandler STG_SIG_HAN p_sp
+ poke p_sp v
+ rts_installHandler STG_SIG_HAN p_sp
case rc of
STG_SIG_DFL -> return Default
STG_SIG_IGN -> return Ignore
STG_SIG_HAN -> do
osptr <- peek p_sp
oldh <- deRefStablePtr osptr
- -- stable pointer is no longer in use, free it.
- freeStablePtr osptr
- return (Catch (\ ev -> oldh (fromConsoleEvent ev)))
+ -- stable pointer is no longer in use, free it.
+ freeStablePtr osptr
+ return (Catch (\ ev -> oldh (fromConsoleEvent ev)))
+ _ -> error "installHandler: Bad non-threaded rc value"
where
- fromConsoleEvent ev =
+ fromConsoleEvent ev =
case ev of
ControlC -> 0 {- CTRL_C_EVENT-}
Break -> 1 {- CTRL_BREAK_EVENT-}
toHandler hdlr ev = do
case toWin32ConsoleEvent ev of
- -- see rts/win32/ConsoleHandler.c for comments as to why
- -- rts_ConsoleHandlerDone is called here.
+ -- see rts/win32/ConsoleHandler.c for comments as to why
+ -- rts_ConsoleHandlerDone is called here.
Just x -> hdlr x >> rts_ConsoleHandlerDone ev
- Nothing -> return () -- silently ignore..
+ Nothing -> return () -- silently ignore..
no_handler = error "win32ConsoleHandler"
flushConsole :: Handle -> IO ()
-flushConsole h =
- wantReadableHandle "flushConsole" h $ \ h_ ->
- throwErrnoIfMinus1Retry_ "flushConsole"
- (flush_console_fd (fromIntegral (haFD h_)))
+flushConsole h =
+ wantReadableHandle_ "flushConsole" h $ \ Handle__{haDevice=dev} ->
+ case cast dev of
+ Nothing -> ioException $
+ IOError (Just h) IllegalOperation "flushConsole"
+ "handle is not a file descriptor" Nothing Nothing
+ Just fd -> do
+ throwErrnoIfMinus1Retry_ "flushConsole" $
+ flush_console_fd (fromIntegral (fdFD fd))
foreign import ccall unsafe "consUtils.h flush_input_console__"
- flush_console_fd :: CInt -> IO CInt
+ flush_console_fd :: CInt -> IO CInt
+
#endif /* mingw32_HOST_OS */