Drop bitrotting HUGS support

It's very unlikely the current `unix` code stands any chance of even
remotely work with Hugs...

System/Posix/IO/Common.hsc

@@ -79,11 +79,6 @@ import GHC.IO.Exception
 import Data.Typeable (cast)
 #endif
 
-#ifdef __HUGS__
-import Hugs.Prelude (IOException(..), IOErrorType(..))
-import qualified Hugs.IO (handleToFd, openFd)
-#endif
-
 #include "HsUnix.h"
 
 -- -----------------------------------------------------------------------------
@@ -239,16 +234,6 @@ handleToFd' h h_@Handle__{haType=_,..} = do
 fdToHandle fd = FD.fdToHandle (fromIntegral fd)
 #endif
 
-#ifdef __HUGS__
-handleToFd h = do
-  fd <- Hugs.IO.handleToFd h
-  return (fromIntegral fd)
-
-fdToHandle fd = do
-  mode <- fdGetMode (fromIntegral fd)
-  Hugs.IO.openFd (fromIntegral fd) False mode True
-#endif
-
 -- -----------------------------------------------------------------------------
 -- Fd options
 

System/Posix/Process.hsc

@@ -78,10 +78,6 @@ import System.Posix.Process.Internals
 import System.Posix.Process.Common
 import System.Posix.Internals ( withFilePath )
 
-#ifdef __HUGS__
-{-# CFILES cbits/HsUnix.c  #-}
-#endif
-
 -- | @'executeFile' cmd args env@ calls one of the
 --   @execv*@ family, depending on whether or not the current
 --   PATH is to be searched for the command, and whether or not an

System/Posix/Process/ByteString.hsc

@@ -90,10 +90,6 @@ import qualified Data.ByteString.Char8 as BC
 
 import System.Posix.ByteString.FilePath
 
-#ifdef __HUGS__
-{-# CFILES cbits/HsUnix.c  #-}
-#endif
-
 -- | @'executeFile' cmd args env@ calls one of the
 --   @execv*@ family, depending on whether or not the current
 --   PATH is to be searched for the command, and whether or not an

System/Posix/Process/Common.hsc

@@ -88,10 +88,6 @@ import GHC.TopHandler   ( runIO )
 import GHC.IO ( unsafeUnmask, uninterruptibleMask_ )
 #endif
 
-#ifdef __HUGS__
-{-# CFILES cbits/HsUnix.c  #-}
-#endif
-
 -- -----------------------------------------------------------------------------
 -- Process environment
 

System/Posix/Signals.hsc

@@ -602,16 +602,7 @@ awaitSignal maybe_sigset = do
 foreign import ccall unsafe "sigsuspend"
   c_sigsuspend :: Ptr CSigset -> IO CInt
 
-#ifdef __HUGS__
-foreign import ccall unsafe "sigdelset"
-  c_sigdelset   :: Ptr CSigset -> CInt -> IO CInt
-
-foreign import ccall unsafe "sigfillset"
-  c_sigfillset  :: Ptr CSigset -> IO CInt
-
-foreign import ccall unsafe "sigismember"
-  c_sigismember :: Ptr CSigset -> CInt -> IO CInt
-#elif defined(darwin_HOST_OS) && __GLASGOW_HASKELL__ < 706
+#if defined(darwin_HOST_OS) && __GLASGOW_HASKELL__ < 706
 -- see http://ghc.haskell.org/trac/ghc/ticket/7359#comment:3
 -- To be removed when support for GHC 7.4.x is dropped
 foreign import ccall unsafe "__hscore_sigdelset"
@@ -631,7 +622,7 @@ foreign import capi unsafe "signal.h sigfillset"
 
 foreign import capi unsafe "signal.h sigismember"
   c_sigismember :: Ptr CSigset -> CInt -> IO CInt
-#endif /* __HUGS__ */
+#endif
 
 foreign import ccall unsafe "sigpending"
   c_sigpending :: Ptr CSigset -> IO CInt

System/Posix/Temp.hsc

@@ -33,7 +33,7 @@ import System.Posix.IO
 import System.Posix.Types
 import System.Posix.Internals (withFilePath, peekFilePath)
 
-#if defined(__GLASGOW_HASKELL__) || defined(__HUGS__)
+#if defined(__GLASGOW_HASKELL__)
 foreign import ccall unsafe "HsUnix.h __hscore_mkstemp"
   c_mkstemp :: CString -> IO CInt
 #endif
@@ -48,7 +48,7 @@ foreign import ccall unsafe "HsUnix.h __hscore_mkstemp"
 mkstemp :: String -> IO (FilePath, Handle)
 mkstemp template' = do
   let template = template' ++ "XXXXXX"
-#if defined(__GLASGOW_HASKELL__) || defined(__HUGS__)
+#if defined(__GLASGOW_HASKELL__)
   withFilePath template $ \ ptr -> do
     fd <- throwErrnoIfMinus1 "mkstemp" (c_mkstemp ptr)
     name <- peekFilePath ptr
@@ -114,7 +114,7 @@ mkdtemp template' = do
   return name
 #endif
 
-#if (!defined(__GLASGOW_HASKELL__) && !defined(__HUGS__)) || !HAVE_MKDTEMP
+#if !defined(__GLASGOW_HASKELL__) || !HAVE_MKDTEMP
 
 foreign import ccall unsafe "mktemp"
   c_mktemp :: CString -> IO CString

System/Posix/Temp/ByteString.hsc

@@ -38,7 +38,7 @@ import System.Posix.Directory (createDirectory)
 import System.Posix.IO
 import System.Posix.Types
 
-#if defined(__GLASGOW_HASKELL__) || defined(__HUGS__)
+#if defined(__GLASGOW_HASKELL__)
 foreign import ccall unsafe "HsUnix.h __hscore_mkstemp"
   c_mkstemp :: CString -> IO CInt
 #endif
@@ -53,7 +53,7 @@ foreign import ccall unsafe "HsUnix.h __hscore_mkstemp"
 mkstemp :: ByteString -> IO (RawFilePath, Handle)
 mkstemp template' = do
   let template = template' `B.append` (BC.pack "XXXXXX")
-#if defined(__GLASGOW_HASKELL__) || defined(__HUGS__)
+#if defined(__GLASGOW_HASKELL__)
   withFilePath template $ \ ptr -> do
     fd <- throwErrnoIfMinus1 "mkstemp" (c_mkstemp ptr)
     name <- peekFilePath ptr
@@ -114,7 +114,7 @@ mkdtemp template' = do
   return name
 #endif
 
-#if (!defined(__GLASGOW_HASKELL__) && !defined(__HUGS__)) || !HAVE_MKDTEMP
+#if !defined(__GLASGOW_HASKELL__) || !HAVE_MKDTEMP
 
 foreign import ccall unsafe "mktemp"
   c_mktemp :: CString -> IO CString