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------------------------------------------------------------------------------
--- |
--- Module : StatFS
--- Copyright : (c) Jose A Ortega Ruiz
--- License : BSD-style (see LICENSE)
---
--- Maintainer : Jose A Ortega Ruiz <jao@gnu.org>
--- Stability : unstable
--- Portability : unportable
---
--- A binding to C's statvfs(2)
---
------------------------------------------------------------------------------
-
-{-# LANGUAGE CPP, ForeignFunctionInterface, EmptyDataDecls #-}
-
-
-module StatFS ( FileSystemStats(..), getFileSystemStats ) where
-
-import Foreign
-import Foreign.C.Types
-import Foreign.C.String
-import Data.ByteString (useAsCString)
-import Data.ByteString.Char8 (pack)
-
-#if defined (__FreeBSD__) || defined (__OpenBSD__) || defined (__APPLE__) || defined (__DragonFly__)
-#define IS_BSD_SYSTEM
-#endif
-
-#ifdef IS_BSD_SYSTEM
-# include <sys/param.h>
-# include <sys/mount.h>
-#else
-# include <sys/vfs.h>
-#endif
-
-data FileSystemStats = FileSystemStats {
- fsStatBlockSize :: Integer
- -- ^ Optimal transfer block size.
- , fsStatBlockCount :: Integer
- -- ^ Total data blocks in file system.
- , fsStatByteCount :: Integer
- -- ^ Total bytes in file system.
- , fsStatBytesFree :: Integer
- -- ^ Free bytes in file system.
- , fsStatBytesAvailable :: Integer
- -- ^ Free bytes available to non-superusers.
- , fsStatBytesUsed :: Integer
- -- ^ Bytes used.
- } deriving (Show, Eq)
-
-data CStatfs
-
-#ifdef IS_BSD_SYSTEM
-foreign import ccall unsafe "sys/mount.h statfs"
-#else
-foreign import ccall unsafe "sys/vfs.h statvfs"
-#endif
- c_statfs :: CString -> Ptr CStatfs -> IO CInt
-
-toI :: CULong -> Integer
-toI = toInteger
-
-getFileSystemStats :: String -> IO (Maybe FileSystemStats)
-getFileSystemStats path =
- allocaBytes (#size struct statfs) $ \vfs ->
- useAsCString (pack path) $ \cpath -> do
- res <- c_statfs cpath vfs
- if res /= 0 then return Nothing
- else do
- bsize <- (#peek struct statfs, f_bsize) vfs
- bcount <- (#peek struct statfs, f_blocks) vfs
- bfree <- (#peek struct statfs, f_bfree) vfs
- bavail <- (#peek struct statfs, f_bavail) vfs
- let bpb = toI bsize
- return $ Just FileSystemStats
- { fsStatBlockSize = bpb
- , fsStatBlockCount = toI bcount
- , fsStatByteCount = toI bcount * bpb
- , fsStatBytesFree = toI bfree * bpb
- , fsStatBytesAvailable = toI bavail * bpb
- , fsStatBytesUsed = toI (bcount - bfree) * bpb
- }