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{- Interface to mtab (and fstab)
-
- Derived from hsshellscript, originally written by
- Volker Wysk <hsss@volker-wysk.de>
-
- Licensed under the GNU LGPL version 2.1 or higher.
-}
{-# LANGUAGE ForeignFunctionInterface #-}
module Utility.Mounts (
Mntent(..),
read_mtab,
read_fstab,
) where
import Control.Monad
import Foreign
import Foreign.C
import GHC.IO hiding (finally, bracket)
import Prelude hiding (catch)
#include <stdio.h>
#include <mntent.h>
data Mntent = Mntent
{ mnt_fsname :: String
, mnt_dir :: String
, mnt_type :: String
, mnt_opts :: String
, mnt_freq :: Int
, mnt_passno :: Int
} deriving (Read, Show, Eq)
read_mounts :: String -> IO [Mntent]
read_mounts path = do
h <- withCString path $ \cpath ->
withCString "r" $ \r ->
c_setmntent cpath r
when (h == nullPtr) $
throwErrno "setmntent"
mntent <- getmntent h []
_ <- c_endmntent h
return mntent
where
getmntent h l = do
ptr <- c_getmntent h
if (ptr == nullPtr)
then return $ reverse l
else do
mnt_fsname_str <- #{peek struct mntent, mnt_fsname} ptr >>= peekCString
mnt_dir_str <- #{peek struct mntent, mnt_dir} ptr >>= peekCString
mnt_type_str <- #{peek struct mntent, mnt_type} ptr >>= peekCString
mnt_opts_str <- #{peek struct mntent, mnt_opts} ptr >>= peekCString
mnt_freq_int <- #{peek struct mntent, mnt_freq} ptr
mnt_passno_int <- #{peek struct mntent, mnt_passno} ptr
let ent = Mntent
{ mnt_fsname = mnt_fsname_str
, mnt_dir = mnt_dir_str
, mnt_type = mnt_type_str
, mnt_opts = mnt_opts_str
, mnt_freq = mnt_freq_int
, mnt_passno = mnt_passno_int
}
getmntent h (ent:l)
read_mtab :: IO [Mntent]
read_mtab = read_mounts "/etc/mtab"
read_fstab :: IO [Mntent]
read_fstab = read_mounts "/etc/fstab"
foreign import ccall safe "setmntent"
c_setmntent :: ((Ptr CChar) -> ((Ptr CChar) -> (IO (Ptr ()))))
foreign import ccall safe "endmntent"
c_endmntent :: ((Ptr ()) -> (IO CInt))
foreign import ccall safe "getmntent"
c_getmntent :: ((Ptr ()) -> (IO (Ptr ())))
|
