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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)
#include <sys/vfs.h>
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
foreign import ccall unsafe "sys/vfs.h statfs64"
c_statfs :: CString -> Ptr CStatfs -> IO CInt
toI :: CLong -> 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 == -1 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
}
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