[project @ 2002-12-18 10:45:31 by malcolm]

[haskell-directory.git] / Foreign / C / Error.hs

diff --git a/Foreign/C/Error.hs b/Foreign/C/Error.hs
index 3bba4ed..069367b 100644 (file)
--- a/Foreign/C/Error.hs
+++ b/Foreign/C/Error.hs
@@ -1,15 +1,13 @@
-{-# OPTIONS -fno-implicit-prelude -#include "HsCore.h" #-}
+{-# OPTIONS -fno-implicit-prelude -#include "HsBase.h" #-}
 -----------------------------------------------------------------------------
--- 
+-- |
 -- Module      :  Foreign.C.Error
 -- Copyright   :  (c) The FFI task force 2001
--- License     :  BSD-style (see the file libraries/core/LICENSE)
+-- License     :  BSD-style (see the file libraries/base/LICENSE)
 -- 
 -- Maintainer  :  ffi@haskell.org
--- Stability   :  experimental
--- Portability :  non-portable
---
--- $Id: Error.hs,v 1.1 2001/06/28 14:15:03 simonmar Exp $
+-- Stability   :  provisional
+-- Portability :  portable
 --
 -- C-specific Marshalling support: Handling of C "errno" error codes
 --
@@ -84,7 +82,9 @@ module Foreign.C.Error (
 -- this is were we get the CCONST_XXX definitions from that configure
 -- calculated for us
 --
+#ifndef __NHC__
 #include "config.h"
+#endif
 
 -- system dependent imports
 -- ------------------------
@@ -92,13 +92,14 @@ module Foreign.C.Error (
 -- GHC allows us to get at the guts inside IO errors/exceptions
 --
 #if __GLASGOW_HASKELL__
-import GHC.IOBase (Exception(..), IOException(..), IOErrorType(..))
+import GHC.IOBase (IOException(..), IOErrorType(..))
 #endif /* __GLASGOW_HASKELL__ */
 
 
 -- regular imports
 -- ---------------
 
+import Foreign.Storable
 import Foreign.Ptr
 import Foreign.C.Types
 import Foreign.C.String
@@ -112,14 +113,21 @@ import GHC.Num
 import GHC.Base
 #else
 import System.IO               ( IOError, Handle, ioError )
+import System.IO.Unsafe                ( unsafePerformIO )
 #endif
 
 -- "errno" type
 -- ------------
 
 -- import of C function that gives address of errno
---
-foreign import "ghcErrno" unsafe _errno :: Ptr CInt
+-- This function exists because errno is a variable on some systems, but on
+-- Windows it is a macro for a function...
+-- [yes, global variables and thread safety don't really go hand-in-hand. -- sof]
+#ifdef __NHC__
+foreign import ccall unsafe "errno.h &errno" _errno :: Ptr CInt
+#else
+foreign import ccall unsafe "HsBase.h ghcErrno" _errno :: Ptr CInt
+#endif
 
 -- Haskell representation for "errno" values
 --
@@ -147,10 +155,13 @@ eOK, e2BIG, eACCES, eADDRINUSE, eADDRNOTAVAIL, eADV, eAFNOSUPPORT, eAGAIN,
   eSOCKTNOSUPPORT, eSPIPE, eSRCH, eSRMNT, eSTALE, eTIME, eTIMEDOUT, 
   eTOOMANYREFS, eTXTBSY, eUSERS, eWOULDBLOCK, eXDEV                   :: Errno
 --
--- the CCONST_XXX identifiers are cpp symbols whose value is computed by
+-- the cCONST_XXX identifiers are cpp symbols whose value is computed by
 -- configure 
 --
 eOK             = Errno 0
+#ifdef __NHC__
+#include "Errno.hs"
+#else
 e2BIG           = Errno (CCONST_E2BIG)
 eACCES         = Errno (CCONST_EACCES)
 eADDRINUSE     = Errno (CCONST_EADDRINUSE)
@@ -249,6 +260,7 @@ eTXTBSY             = Errno (CCONST_ETXTBSY)
 eUSERS         = Errno (CCONST_EUSERS)
 eWOULDBLOCK    = Errno (CCONST_EWOULDBLOCK)
 eXDEV          = Errno (CCONST_EXDEV)
+#endif
 
 -- checks whether the given errno value is supported on the current
 -- architecture
@@ -404,7 +416,7 @@ errnoToIOError :: String -> Errno -> Maybe Handle -> Maybe String -> IOError
 errnoToIOError loc errno maybeHdl maybeName = unsafePerformIO $ do
     str <- strerror errno >>= peekCString
 #if __GLASGOW_HASKELL__
-    return (IOException (IOError maybeHdl errType loc str maybeName))
+    return (IOError maybeHdl errType loc str maybeName)
     where
     errType
         | errno == eOK             = OtherError
@@ -456,7 +468,7 @@ errnoToIOError loc errno maybeHdl maybeName = unsafePerformIO $ do
         | errno == eNFILE          = ResourceExhausted
         | errno == eNOBUFS         = ResourceExhausted
         | errno == eNODATA         = NoSuchThing
-        | errno == eNODEV          = NoSuchThing
+        | errno == eNODEV          = UnsupportedOperation
         | errno == eNOENT          = NoSuchThing
         | errno == eNOEXEC         = InvalidArgument
         | errno == eNOLCK          = ResourceExhausted
@@ -511,4 +523,4 @@ errnoToIOError loc errno maybeHdl maybeName = unsafePerformIO $ do
     return (userError (loc ++ ": " ++ str ++ maybe "" (": "++) maybeName))
 #endif
 
-foreign import unsafe strerror :: Errno -> IO (Ptr CChar)
+foreign import ccall unsafe "string.h" strerror :: Errno -> IO (Ptr CChar)