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authorJose Antonio Ortega Ruiz <jao@gnu.org>2010-12-21 02:36:35 +0100
committerJose Antonio Ortega Ruiz <jao@gnu.org>2010-12-21 02:36:35 +0100
commite3853a9cb2a9a2cffa174d1334e2ca8ba610f151 (patch)
tree13aa04faea320afe85636e23686280386c1c2910 /StatFS.hsc
parent598bfe5deeff079280e8513c55dc7bda3e8cf9a0 (diff)
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Haskell sources moved to src/ to unclutter toplevel
Diffstat (limited to 'StatFS.hsc')
-rw-r--r--StatFS.hsc79
1 files changed, 0 insertions, 79 deletions
diff --git a/StatFS.hsc b/StatFS.hsc
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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__)
-# 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
-
-#if defined(__FreeBSD__)
-foreign import ccall unsafe "sys/mount.h statfs"
-#else
-foreign import ccall unsafe "sys/vfs.h statfs64"
-#endif
- 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
- }