module Panic
(
GhcException(..), ghcError, progName,
+ pgmError,
panic, panic#, assertPanic, trace,
- showException, showGhcException, Exception.throwDyn, tryMost,
+ showException, showGhcException, tryMost,
+ installSignalHandlers,
- Exception.Exception,
- Panic.try, -- try :: IO a -> IO (Either Exception a)
- -- This is Control.Exception.try in the new library story
- -- Exception.tryAllIO in GHC 4.08
- -- So it usefully hides the difference
-
-#if __GLASGOW_HASKELL__ <= 408
- catchJust, ioErrors, throwTo,
-#endif
+ catchJust, tryJust, ioErrors, throwTo,
) where
#include "HsVersions.h"
import Config
import FastTypes
+#ifndef mingw32_HOST_OS
+# if __GLASGOW_HASKELL__ > 504
+import System.Posix.Signals
+# else
+import Posix ( Handler(Catch), installHandler, sigINT, sigQUIT )
+# endif /* GHC > 504 */
+#endif /* mingw32_HOST_OS */
+
+#if defined(mingw32_HOST_OS) && __GLASGOW_HASKELL__ >= 603
+import GHC.ConsoleHandler
+#endif
+
+# if __GLASGOW_HASKELL__ < 500
+import EXCEPTION ( raiseInThread )
+# else
+import EXCEPTION ( throwTo )
+# endif /* GHC < 500 */
+
+#if __GLASGOW_HASKELL__ > 408
+import EXCEPTION ( catchJust, tryJust, ioErrors )
+#endif
+
+import CONCURRENT ( myThreadId )
import DYNAMIC
import qualified EXCEPTION as Exception
import TRACE ( trace )
++ "to glasgow-haskell-bugs@haskell.org,\n"
++ "or http://sourceforge.net/projects/ghc/.\n\n")
+#if __GLASGOW_HASKELL__ < 603
+myMkTyConApp = mkAppTy
+#else
+myMkTyConApp = mkTyConApp
+#endif
+
ghcExceptionTc = mkTyCon "GhcException"
{-# NOINLINE ghcExceptionTc #-}
instance Typeable GhcException where
- typeOf _ = mkAppTy ghcExceptionTc []
+ typeOf _ = myMkTyConApp ghcExceptionTc []
\end{code}
Panics and asserts.
\begin{code}
-panic :: String -> a
-panic x = Exception.throwDyn (Panic x)
+panic, pgmError :: String -> a
+panic x = Exception.throwDyn (Panic x)
+pgmError x = Exception.throwDyn (ProgramError x)
-- #-versions because panic can't return an unboxed int, and that's
-- what TAG_ is with GHC at the moment. Ugh. (Simon)
-- files, for example.
tryMost :: IO a -> IO (Either Exception.Exception a)
-tryMost action = do r <- try action; filter r
+tryMost action = do r <- myTry action; filter r
where
filter (Left e@(Exception.DynException d))
| Just ghc_ex <- fromDynamic d
= return other
#if __GLASGOW_HASKELL__ <= 408
-try = Exception.tryAllIO
+myTry = Exception.tryAllIO
#else
-try = Exception.try
+myTry = Exception.try
#endif
\end{code}
\begin{code}
#if __GLASGOW_HASKELL__ <= 408
catchJust = Exception.catchIO
+tryJust = Exception.tryIO
ioErrors = Exception.justIoErrors
throwTo = Exception.raiseInThread
#endif
\end{code}
+
+Standard signal handlers for catching ^C, which just throw an
+exception in the main thread. NOTE: must be called from the main
+thread.
+
+\begin{code}
+installSignalHandlers :: IO ()
+installSignalHandlers = do
+ main_thread <- myThreadId
+ let
+ interrupt_exn = Exception.DynException (toDyn Interrupted)
+ interrupt = throwTo main_thread interrupt_exn
+ --
+#if !defined(mingw32_HOST_OS)
+ installHandler sigQUIT (Catch interrupt) Nothing
+ installHandler sigINT (Catch interrupt) Nothing
+ return ()
+#elif __GLASGOW_HASKELL__ >= 603
+ -- GHC 6.3+ has support for console events on Windows
+ -- NOTE: running GHCi under a bash shell for some reason requires
+ -- you to press Ctrl-Break rather than Ctrl-C to provoke
+ -- an interrupt. Ctrl-C is getting blocked somewhere, I don't know
+ -- why --SDM 17/12/2004
+ let sig_handler ControlC = interrupt
+ sig_handler Break = interrupt
+ sig_handler _ = return ()
+
+ installHandler (Catch sig_handler)
+ return ()
+#else
+ return () -- nothing
+#endif
+\end{code}