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|
#ifdef __GLASGOW_HASKELL__
{-# LANGUAGE Trustworthy #-}
#endif
-----------------------------------------------------------------------------
-- |
-- Module : System.Posix.Directory.Common
-- Copyright : (c) The University of Glasgow 2002
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : provisional
-- Portability : non-portable (requires POSIX)
--
-- POSIX directory support
--
-----------------------------------------------------------------------------
#include "HsUnix.h"
module System.Posix.Directory.Common (
DirStream(..), CDir, CDirent, DirStreamOffset(..),
rewindDirStream,
closeDirStream,
#ifdef HAVE_SEEKDIR
seekDirStream,
#endif
#ifdef HAVE_TELLDIR
tellDirStream,
#endif
changeWorkingDirectoryFd,
) where
import System.Posix.Types
import Foreign
import Foreign.C
newtype DirStream = DirStream (Ptr CDir)
type CDir = ()
type CDirent = ()
-- | @rewindDirStream dp@ calls @rewinddir@ to reposition
-- the directory stream @dp@ at the beginning of the directory.
rewindDirStream :: DirStream -> IO ()
rewindDirStream (DirStream dirp) = c_rewinddir dirp
foreign import ccall unsafe "rewinddir"
c_rewinddir :: Ptr CDir -> IO ()
-- | @closeDirStream dp@ calls @closedir@ to close
-- the directory stream @dp@.
closeDirStream :: DirStream -> IO ()
closeDirStream (DirStream dirp) = do
throwErrnoIfMinus1Retry_ "closeDirStream" (c_closedir dirp)
foreign import ccall unsafe "closedir"
c_closedir :: Ptr CDir -> IO CInt
newtype DirStreamOffset = DirStreamOffset COff
#ifdef HAVE_SEEKDIR
seekDirStream :: DirStream -> DirStreamOffset -> IO ()
seekDirStream (DirStream dirp) (DirStreamOffset off) =
c_seekdir dirp off
foreign import ccall unsafe "seekdir"
c_seekdir :: Ptr CDir -> COff -> IO ()
#endif
#ifdef HAVE_TELLDIR
tellDirStream :: DirStream -> IO DirStreamOffset
tellDirStream (DirStream dirp) = do
off <- c_telldir dirp
return (DirStreamOffset off)
foreign import ccall unsafe "telldir"
c_telldir :: Ptr CDir -> IO COff
#endif
changeWorkingDirectoryFd :: Fd -> IO ()
changeWorkingDirectoryFd (Fd fd) =
throwErrnoIfMinus1Retry_ "changeWorkingDirectoryFd" (c_fchdir fd)
foreign import ccall unsafe "fchdir"
c_fchdir :: CInt -> IO CInt
|
