{-# LINE 1 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 2 "libraries/unix/System/Posix/Files/Common.hsc" #-}
{-# LANGUAGE Trustworthy #-}

{-# LINE 4 "libraries/unix/System/Posix/Files/Common.hsc" #-}
-----------------------------------------------------------------------------
-- |
-- Module      :  System.Posix.Files.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)
--
-- Functions defined by the POSIX standards for manipulating and querying the
-- file system. Names of underlying POSIX functions are indicated whenever
-- possible. A more complete documentation of the POSIX functions together
-- with a more detailed description of different error conditions are usually
-- available in the system's manual pages or from
-- <http://www.unix.org/version3/online.html> (free registration required).
--
-- When a function that calls an underlying POSIX function fails, the errno
-- code is converted to an 'IOError' using 'Foreign.C.Error.errnoToIOError'.
-- For a list of which errno codes may be generated, consult the POSIX
-- documentation for the underlying function.
--
-----------------------------------------------------------------------------


{-# LINE 29 "libraries/unix/System/Posix/Files/Common.hsc" #-}

module System.Posix.Files.Common (
    -- * File modes
    -- FileMode exported by System.Posix.Types
    unionFileModes, intersectFileModes,
    nullFileMode,
    ownerReadMode, ownerWriteMode, ownerExecuteMode, ownerModes,
    groupReadMode, groupWriteMode, groupExecuteMode, groupModes,
    otherReadMode, otherWriteMode, otherExecuteMode, otherModes,
    setUserIDMode, setGroupIDMode,
    stdFileMode,   accessModes,
    fileTypeModes,
    blockSpecialMode, characterSpecialMode, namedPipeMode, regularFileMode,
    directoryMode, symbolicLinkMode, socketMode,

    -- ** Setting file modes
    setFdMode, setFileCreationMask,

    -- * File status
    FileStatus(..),
    -- ** Obtaining file status
    getFdStatus,
    -- ** Querying file status
    deviceID, fileID, fileMode, linkCount, fileOwner, fileGroup,
    specialDeviceID, fileSize, accessTime, modificationTime,
    statusChangeTime,
    accessTimeHiRes, modificationTimeHiRes, statusChangeTimeHiRes,
    setFdTimesHiRes, touchFd,
    isBlockDevice, isCharacterDevice, isNamedPipe, isRegularFile,
    isDirectory, isSymbolicLink, isSocket,

    -- * Setting file sizes
    setFdSize,

    -- * Changing file ownership
    setFdOwnerAndGroup,

    -- * Find system-specific limits for a file
    PathVar(..), getFdPathVar, pathVarConst,

    -- * Low level types and functions

{-# LINE 71 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    CTimeSpec(..),
    toCTimeSpec,
    c_utimensat,

{-# LINE 75 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    CTimeVal(..),
    toCTimeVal,
    c_utimes,

{-# LINE 81 "libraries/unix/System/Posix/Files/Common.hsc" #-}
  ) where

import System.Posix.Types
import System.IO.Unsafe
import Data.Bits
import Data.Int
import Data.Ratio
import Data.Time.Clock.POSIX (POSIXTime)
import System.Posix.Internals
import Foreign.C
import Foreign.ForeignPtr

{-# LINE 93 "libraries/unix/System/Posix/Files/Common.hsc" #-}
import Foreign.Marshal (withArray)

{-# LINE 95 "libraries/unix/System/Posix/Files/Common.hsc" #-}
import Foreign.Ptr
import Foreign.Storable

-- -----------------------------------------------------------------------------
-- POSIX file modes

-- The abstract type 'FileMode', constants and operators for
-- manipulating the file modes defined by POSIX.

-- | No permissions.
nullFileMode :: FileMode
nullFileMode = 0

-- | Owner has read permission.
ownerReadMode :: FileMode
ownerReadMode = (256)
{-# LINE 111 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Owner has write permission.
ownerWriteMode :: FileMode
ownerWriteMode = (128)
{-# LINE 115 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Owner has execute permission.
ownerExecuteMode :: FileMode
ownerExecuteMode = (64)
{-# LINE 119 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has read permission.
groupReadMode :: FileMode
groupReadMode = (32)
{-# LINE 123 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has write permission.
groupWriteMode :: FileMode
groupWriteMode = (16)
{-# LINE 127 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has execute permission.
groupExecuteMode :: FileMode
groupExecuteMode = (8)
{-# LINE 131 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have read permission.
otherReadMode :: FileMode
otherReadMode = (4)
{-# LINE 135 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have write permission.
otherWriteMode :: FileMode
otherWriteMode = (2)
{-# LINE 139 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have execute permission.
otherExecuteMode :: FileMode
otherExecuteMode = (1)
{-# LINE 143 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Set user ID on execution.
setUserIDMode :: FileMode
setUserIDMode = (2048)
{-# LINE 147 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Set group ID on execution.
setGroupIDMode :: FileMode
setGroupIDMode = (1024)
{-# LINE 151 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Owner, group and others have read and write permission.
stdFileMode :: FileMode
stdFileMode = ownerReadMode  .|. ownerWriteMode .|.
              groupReadMode  .|. groupWriteMode .|.
              otherReadMode  .|. otherWriteMode

-- | Owner has read, write and execute permission.
ownerModes :: FileMode
ownerModes = (448)
{-# LINE 161 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has read, write and execute permission.
groupModes :: FileMode
groupModes = (56)
{-# LINE 165 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have read, write and execute permission.
otherModes :: FileMode
otherModes = (7)
{-# LINE 169 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Owner, group and others have read, write and execute permission.
accessModes :: FileMode
accessModes = ownerModes .|. groupModes .|. otherModes

-- | Combines the two file modes into one that contains modes that appear in
-- either.
unionFileModes :: FileMode -> FileMode -> FileMode
unionFileModes m1 m2 = m1 .|. m2

-- | Combines two file modes into one that only contains modes that appear in
-- both.
intersectFileModes :: FileMode -> FileMode -> FileMode
intersectFileModes m1 m2 = m1 .&. m2

fileTypeModes :: FileMode
fileTypeModes = (61440)
{-# LINE 186 "libraries/unix/System/Posix/Files/Common.hsc" #-}

blockSpecialMode :: FileMode
blockSpecialMode = (24576)
{-# LINE 189 "libraries/unix/System/Posix/Files/Common.hsc" #-}

characterSpecialMode :: FileMode
characterSpecialMode = (8192)
{-# LINE 192 "libraries/unix/System/Posix/Files/Common.hsc" #-}

namedPipeMode :: FileMode
namedPipeMode = (4096)
{-# LINE 195 "libraries/unix/System/Posix/Files/Common.hsc" #-}

regularFileMode :: FileMode
regularFileMode = (32768)
{-# LINE 198 "libraries/unix/System/Posix/Files/Common.hsc" #-}

directoryMode :: FileMode
directoryMode = (16384)
{-# LINE 201 "libraries/unix/System/Posix/Files/Common.hsc" #-}

symbolicLinkMode :: FileMode
symbolicLinkMode = (40960)
{-# LINE 204 "libraries/unix/System/Posix/Files/Common.hsc" #-}

socketMode :: FileMode
socketMode = (49152)
{-# LINE 207 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | @setFdMode fd mode@ acts like 'setFileMode' but uses a file descriptor
-- @fd@ instead of a 'FilePath'.
--
-- Note: calls @fchmod@.
setFdMode :: Fd -> FileMode -> IO ()
setFdMode (Fd fd) m =
  throwErrnoIfMinus1_ "setFdMode" (c_fchmod fd m)

foreign import ccall unsafe "fchmod"
  c_fchmod :: CInt -> CMode -> IO CInt

-- | @setFileCreationMask mode@ sets the file mode creation mask to @mode@.
-- Modes set by this operation are subtracted from files and directories upon
-- creation. The previous file creation mask is returned.
--
-- Note: calls @umask@.
setFileCreationMask :: FileMode -> IO FileMode
setFileCreationMask mask = c_umask mask

-- -----------------------------------------------------------------------------
-- stat() support

-- | POSIX defines operations to get information, such as owner, permissions,
-- size and access times, about a file. This information is represented by the
-- 'FileStatus' type.
--
-- Note: see @chmod@.
newtype FileStatus = FileStatus (ForeignPtr CStat)

-- | ID of the device on which this file resides.
deviceID         :: FileStatus -> DeviceID
-- | inode number
fileID           :: FileStatus -> FileID
-- | File mode (such as permissions).
fileMode         :: FileStatus -> FileMode
-- | Number of hard links to this file.
linkCount        :: FileStatus -> LinkCount
-- | ID of owner.
fileOwner        :: FileStatus -> UserID
-- | ID of group.
fileGroup        :: FileStatus -> GroupID
-- | Describes the device that this file represents.
specialDeviceID  :: FileStatus -> DeviceID
-- | Size of the file in bytes. If this file is a symbolic link the size is
-- the length of the pathname it contains.
fileSize         :: FileStatus -> FileOffset
-- | Time of last access.
accessTime       :: FileStatus -> EpochTime
-- | Time of last access in sub-second resolution.
accessTimeHiRes  :: FileStatus -> POSIXTime
-- | Time of last modification.
modificationTime :: FileStatus -> EpochTime
-- | Time of last modification in sub-second resolution.
modificationTimeHiRes :: FileStatus -> POSIXTime
-- | Time of last status change (i.e. owner, group, link count, mode, etc.).
statusChangeTime :: FileStatus -> EpochTime
-- | Time of last status change (i.e. owner, group, link count, mode, etc.) in sub-second resolution.
statusChangeTimeHiRes :: FileStatus -> POSIXTime

deviceID (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 0))
{-# LINE 269 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileID (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 16))
{-# LINE 271 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileMode (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 24))
{-# LINE 273 "libraries/unix/System/Posix/Files/Common.hsc" #-}
linkCount (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 28))
{-# LINE 275 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileOwner (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 32))
{-# LINE 277 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileGroup (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 36))
{-# LINE 279 "libraries/unix/System/Posix/Files/Common.hsc" #-}
specialDeviceID (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 40))
{-# LINE 281 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileSize (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 52))
{-# LINE 283 "libraries/unix/System/Posix/Files/Common.hsc" #-}
accessTime (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 60))
{-# LINE 285 "libraries/unix/System/Posix/Files/Common.hsc" #-}
modificationTime (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 68))
{-# LINE 287 "libraries/unix/System/Posix/Files/Common.hsc" #-}
statusChangeTime (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 76))
{-# LINE 289 "libraries/unix/System/Posix/Files/Common.hsc" #-}

accessTimeHiRes (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ \stat_ptr -> do
    sec  <- ((\hsc_ptr -> peekByteOff hsc_ptr 60)) stat_ptr :: IO EpochTime
{-# LINE 293 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 294 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    nsec <- ((\hsc_ptr -> peekByteOff hsc_ptr 64)) stat_ptr :: IO (Int32)
{-# LINE 295 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    let frac = toInteger nsec % 10^(9::Int)

{-# LINE 311 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    return $ fromRational $ toRational sec + frac

modificationTimeHiRes (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ \stat_ptr -> do
    sec  <- ((\hsc_ptr -> peekByteOff hsc_ptr 68)) stat_ptr :: IO EpochTime
{-# LINE 316 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 317 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    nsec <- ((\hsc_ptr -> peekByteOff hsc_ptr 72)) stat_ptr :: IO (Int32)
{-# LINE 318 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    let frac = toInteger nsec % 10^(9::Int)

{-# LINE 334 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    return $ fromRational $ toRational sec + frac

statusChangeTimeHiRes (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ \stat_ptr -> do
    sec  <- ((\hsc_ptr -> peekByteOff hsc_ptr 76)) stat_ptr :: IO EpochTime
{-# LINE 339 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 340 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    nsec <- ((\hsc_ptr -> peekByteOff hsc_ptr 80)) stat_ptr :: IO (Int32)
{-# LINE 341 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    let frac = toInteger nsec % 10^(9::Int)

{-# LINE 357 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    return $ fromRational $ toRational sec + frac

-- | Checks if this file is a block device.
isBlockDevice     :: FileStatus -> Bool
-- | Checks if this file is a character device.
isCharacterDevice :: FileStatus -> Bool
-- | Checks if this file is a named pipe device.
isNamedPipe       :: FileStatus -> Bool
-- | Checks if this file is a regular file device.
isRegularFile     :: FileStatus -> Bool
-- | Checks if this file is a directory device.
isDirectory       :: FileStatus -> Bool
-- | Checks if this file is a symbolic link device.
isSymbolicLink    :: FileStatus -> Bool
-- | Checks if this file is a socket device.
isSocket          :: FileStatus -> Bool

isBlockDevice stat =
  (fileMode stat `intersectFileModes` fileTypeModes) == blockSpecialMode
isCharacterDevice stat =
  (fileMode stat `intersectFileModes` fileTypeModes) == characterSpecialMode
isNamedPipe stat =
  (fileMode stat `intersectFileModes` fileTypeModes) == namedPipeMode
isRegularFile stat =
  (fileMode stat `intersectFileModes` fileTypeModes) == regularFileMode
isDirectory stat =
  (fileMode stat `intersectFileModes` fileTypeModes) == directoryMode
isSymbolicLink stat =
  (fileMode stat `intersectFileModes` fileTypeModes) == symbolicLinkMode
isSocket stat =
  (fileMode stat `intersectFileModes` fileTypeModes) == socketMode

-- | @getFdStatus fd@ acts as 'getFileStatus' but uses a file descriptor @fd@.
--
-- Note: calls @fstat@.
getFdStatus :: Fd -> IO FileStatus
getFdStatus (Fd fd) = do
  fp <- mallocForeignPtrBytes (144)
{-# LINE 395 "libraries/unix/System/Posix/Files/Common.hsc" #-}
  withForeignPtr fp $ \p ->
    throwErrnoIfMinus1_ "getFdStatus" (c_fstat fd p)
  return (FileStatus fp)

-- -----------------------------------------------------------------------------
-- Setting file times


{-# LINE 403 "libraries/unix/System/Posix/Files/Common.hsc" #-}
data CTimeSpec = CTimeSpec EpochTime CLong

instance Storable CTimeSpec where
    sizeOf    _ = (8)
{-# LINE 407 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    alignment _ = alignment (undefined :: CInt)
    poke p (CTimeSpec sec nsec) = do
        ((\hsc_ptr -> pokeByteOff hsc_ptr 0)) p sec
{-# LINE 410 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        ((\hsc_ptr -> pokeByteOff hsc_ptr 4)) p nsec
{-# LINE 411 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    peek p = do
        sec  <- (\hsc_ptr -> peekByteOff hsc_ptr 0) p
{-# LINE 413 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        nsec <- (\hsc_ptr -> peekByteOff hsc_ptr 4) p
{-# LINE 414 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        return $ CTimeSpec sec nsec

toCTimeSpec :: POSIXTime -> CTimeSpec
toCTimeSpec t = CTimeSpec (CTime sec) (truncate $ 10^(9::Int) * frac)
  where
    (sec, frac) = if (frac' < 0) then (sec' - 1, frac' + 1) else (sec', frac')
    (sec', frac') = properFraction $ toRational t

{-# LINE 422 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 424 "libraries/unix/System/Posix/Files/Common.hsc" #-}
foreign import ccall unsafe "utimensat"
    c_utimensat :: CInt -> CString -> Ptr CTimeSpec -> CInt -> IO CInt

{-# LINE 427 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 429 "libraries/unix/System/Posix/Files/Common.hsc" #-}
foreign import ccall unsafe "futimens"
    c_futimens :: CInt -> Ptr CTimeSpec -> IO CInt

{-# LINE 432 "libraries/unix/System/Posix/Files/Common.hsc" #-}

data CTimeVal = CTimeVal CLong CLong

instance Storable CTimeVal where
    sizeOf    _ = (8)
{-# LINE 437 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    alignment _ = alignment (undefined :: CInt)
    poke p (CTimeVal sec usec) = do
        ((\hsc_ptr -> pokeByteOff hsc_ptr 0)) p sec
{-# LINE 440 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        ((\hsc_ptr -> pokeByteOff hsc_ptr 4)) p usec
{-# LINE 441 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    peek p = do
        sec  <- (\hsc_ptr -> peekByteOff hsc_ptr 0) p
{-# LINE 443 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        usec <- (\hsc_ptr -> peekByteOff hsc_ptr 4) p
{-# LINE 444 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        return $ CTimeVal sec usec

toCTimeVal :: POSIXTime -> CTimeVal
toCTimeVal t = CTimeVal sec (truncate $ 10^(6::Int) * frac)
  where
    (sec, frac) = if (frac' < 0) then (sec' - 1, frac' + 1) else (sec', frac')
    (sec', frac') = properFraction $ toRational t

foreign import ccall unsafe "utimes"
    c_utimes :: CString -> Ptr CTimeVal -> IO CInt


{-# LINE 459 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 464 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Like 'setFileTimesHiRes' but uses a file descriptor instead of a path.
-- This operation is not supported on all platforms. On these platforms,
-- this function will raise an exception.
--
-- Note: calls @futimens@ or @futimes@.
--
-- /Since: 2.7.0.0/
setFdTimesHiRes :: Fd -> POSIXTime -> POSIXTime -> IO ()

{-# LINE 474 "libraries/unix/System/Posix/Files/Common.hsc" #-}
setFdTimesHiRes (Fd fd) atime mtime =
  withArray [toCTimeSpec atime, toCTimeSpec mtime] $ \times ->
    throwErrnoIfMinus1_ "setFdTimesHiRes" (c_futimens fd times)

{-# LINE 485 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Like 'touchFile' but uses a file descriptor instead of a path.
-- This operation is not supported on all platforms. On these platforms,
-- this function will raise an exception.
--
-- Note: calls @futimes@.
--
-- /Since: 2.7.0.0/
touchFd :: Fd -> IO ()

{-# LINE 498 "libraries/unix/System/Posix/Files/Common.hsc" #-}
touchFd =
  error "touchFd: not available on this platform"

{-# LINE 501 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- -----------------------------------------------------------------------------
-- fchown()

-- | Acts as 'setOwnerAndGroup' but uses a file descriptor instead of a
-- 'FilePath'.
--
-- Note: calls @fchown@.
setFdOwnerAndGroup :: Fd -> UserID -> GroupID -> IO ()
setFdOwnerAndGroup (Fd fd) uid gid =
  throwErrnoIfMinus1_ "setFdOwnerAndGroup" (c_fchown fd uid gid)

foreign import ccall unsafe "fchown"
  c_fchown :: CInt -> CUid -> CGid -> IO CInt

-- -----------------------------------------------------------------------------
-- ftruncate()

-- | Acts as 'setFileSize' but uses a file descriptor instead of a 'FilePath'.
--
-- Note: calls @ftruncate@.
setFdSize :: Fd -> FileOffset -> IO ()
setFdSize (Fd fd) off =
  throwErrnoIfMinus1_ "setFdSize" (c_ftruncate fd off)

-- -----------------------------------------------------------------------------
-- pathconf()/fpathconf() support

data PathVar
  = FileSizeBits                  {- _PC_FILESIZEBITS     -}
  | LinkLimit                     {- _PC_LINK_MAX         -}
  | InputLineLimit                {- _PC_MAX_CANON        -}
  | InputQueueLimit               {- _PC_MAX_INPUT        -}
  | FileNameLimit                 {- _PC_NAME_MAX         -}
  | PathNameLimit                 {- _PC_PATH_MAX         -}
  | PipeBufferLimit               {- _PC_PIPE_BUF         -}
                                  -- These are described as optional in POSIX:
                                  {- _PC_ALLOC_SIZE_MIN     -}
                                  {- _PC_REC_INCR_XFER_SIZE -}
                                  {- _PC_REC_MAX_XFER_SIZE  -}
                                  {- _PC_REC_MIN_XFER_SIZE  -}
                                  {- _PC_REC_XFER_ALIGN     -}
  | SymbolicLinkLimit             {- _PC_SYMLINK_MAX      -}
  | SetOwnerAndGroupIsRestricted  {- _PC_CHOWN_RESTRICTED -}
  | FileNamesAreNotTruncated      {- _PC_NO_TRUNC         -}
  | VDisableChar                  {- _PC_VDISABLE         -}
  | AsyncIOAvailable              {- _PC_ASYNC_IO         -}
  | PrioIOAvailable               {- _PC_PRIO_IO          -}
  | SyncIOAvailable               {- _PC_SYNC_IO          -}

pathVarConst :: PathVar -> CInt
pathVarConst v = case v of
        LinkLimit                       -> (1)
{-# LINE 554 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        InputLineLimit                  -> (2)
{-# LINE 555 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        InputQueueLimit                 -> (3)
{-# LINE 556 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        FileNameLimit                   -> (4)
{-# LINE 557 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        PathNameLimit                   -> (5)
{-# LINE 558 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        PipeBufferLimit                 -> (6)
{-# LINE 559 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        SetOwnerAndGroupIsRestricted    -> (9)
{-# LINE 560 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        FileNamesAreNotTruncated        -> (7)
{-# LINE 561 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        VDisableChar                    -> (8)
{-# LINE 562 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 564 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        SyncIOAvailable         -> (12)
{-# LINE 565 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 568 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 570 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        AsyncIOAvailable        -> (10)
{-# LINE 571 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 574 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 576 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        PrioIOAvailable         -> (11)
{-# LINE 577 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 580 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 582 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        FileSizeBits            -> (67)
{-# LINE 583 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 586 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 588 "libraries/unix/System/Posix/Files/Common.hsc" #-}
        SymbolicLinkLimit       -> (18)
{-# LINE 589 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 592 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | @getFdPathVar var fd@ obtains the dynamic value of the requested
-- configurable file limit or option associated with the file or directory
-- attached to the open channel @fd@. For defined file limits, @getFdPathVar@
-- returns the associated value.  For defined file options, the result of
-- @getFdPathVar@ is undefined, but not failure.
--
-- Note: calls @fpathconf@.
getFdPathVar :: Fd -> PathVar -> IO Limit
getFdPathVar (Fd fd) v =
    throwErrnoIfMinus1 "getFdPathVar" $
      c_fpathconf fd (pathVarConst v)

foreign import ccall unsafe "fpathconf"
  c_fpathconf :: CInt -> CInt -> IO CLong