{-# LINE 1 "libraries/unix/System/Posix/Files/Common.hsc" #-}
{-# LANGUAGE ForeignFunctionInterface #-}
{-# LINE 2 "libraries/unix/System/Posix/Files/Common.hsc" #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}

{-# LINE 4 "libraries/unix/System/Posix/Files/Common.hsc" #-}
{-# LANGUAGE Trustworthy #-}

{-# LINE 6 "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 31 "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,
    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,
  ) where

import System.Posix.Error
import System.Posix.Types
import System.IO.Unsafe
import Data.Bits
import Data.Time.Clock.POSIX
import Data.Ratio
import System.Posix.Internals
import Foreign hiding (unsafePerformIO)
import Foreign.C

-- -----------------------------------------------------------------------------
-- 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 94 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Owner has write permission.
ownerWriteMode :: FileMode
ownerWriteMode = (128)
{-# LINE 98 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Owner has execute permission.
ownerExecuteMode :: FileMode
ownerExecuteMode = (64)
{-# LINE 102 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has read permission.
groupReadMode :: FileMode
groupReadMode = (32)
{-# LINE 106 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has write permission.
groupWriteMode :: FileMode
groupWriteMode = (16)
{-# LINE 110 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has execute permission.
groupExecuteMode :: FileMode
groupExecuteMode = (8)
{-# LINE 114 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have read permission.
otherReadMode :: FileMode
otherReadMode = (4)
{-# LINE 118 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have write permission.
otherWriteMode :: FileMode
otherWriteMode = (2)
{-# LINE 122 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have execute permission.
otherExecuteMode :: FileMode
otherExecuteMode = (1)
{-# LINE 126 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Set user ID on execution.
setUserIDMode :: FileMode
setUserIDMode = (2048)
{-# LINE 130 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Set group ID on execution.
setGroupIDMode :: FileMode
setGroupIDMode = (1024)
{-# LINE 134 "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 144 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Group has read, write and execute permission.
groupModes :: FileMode
groupModes = (56)
{-# LINE 148 "libraries/unix/System/Posix/Files/Common.hsc" #-}

-- | Others have read, write and execute permission.
otherModes :: FileMode
otherModes = (7)
{-# LINE 152 "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 169 "libraries/unix/System/Posix/Files/Common.hsc" #-}

blockSpecialMode :: FileMode
blockSpecialMode = (24576)
{-# LINE 172 "libraries/unix/System/Posix/Files/Common.hsc" #-}

characterSpecialMode :: FileMode
characterSpecialMode = (8192)
{-# LINE 175 "libraries/unix/System/Posix/Files/Common.hsc" #-}

namedPipeMode :: FileMode
namedPipeMode = (4096)
{-# LINE 178 "libraries/unix/System/Posix/Files/Common.hsc" #-}

regularFileMode :: FileMode
regularFileMode = (32768)
{-# LINE 181 "libraries/unix/System/Posix/Files/Common.hsc" #-}

directoryMode :: FileMode
directoryMode = (16384)
{-# LINE 184 "libraries/unix/System/Posix/Files/Common.hsc" #-}

symbolicLinkMode :: FileMode
symbolicLinkMode = (40960)
{-# LINE 187 "libraries/unix/System/Posix/Files/Common.hsc" #-}

socketMode :: FileMode
socketMode = (49152)
{-# LINE 190 "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 252 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileID (FileStatus stat) = 
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 8))
{-# LINE 254 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileMode (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 4))
{-# LINE 256 "libraries/unix/System/Posix/Files/Common.hsc" #-}
linkCount (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 6))
{-# LINE 258 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileOwner (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 16))
{-# LINE 260 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileGroup (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 20))
{-# LINE 262 "libraries/unix/System/Posix/Files/Common.hsc" #-}
specialDeviceID (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 24))
{-# LINE 264 "libraries/unix/System/Posix/Files/Common.hsc" #-}
fileSize (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 60))
{-# LINE 266 "libraries/unix/System/Posix/Files/Common.hsc" #-}
accessTime (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 28))
{-# LINE 268 "libraries/unix/System/Posix/Files/Common.hsc" #-}
modificationTime (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 36))
{-# LINE 270 "libraries/unix/System/Posix/Files/Common.hsc" #-}
statusChangeTime (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ ((\hsc_ptr -> peekByteOff hsc_ptr 44))
{-# LINE 272 "libraries/unix/System/Posix/Files/Common.hsc" #-}

accessTimeHiRes (FileStatus stat) =
  unsafePerformIO $ withForeignPtr stat $ \stat_ptr -> do
    sec  <- ((\hsc_ptr -> peekByteOff hsc_ptr 28)) stat_ptr :: IO EpochTime
{-# LINE 276 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 280 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    nsec <- ((\hsc_ptr -> peekByteOff hsc_ptr 32)) stat_ptr :: IO (Int32)
{-# LINE 281 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    let frac = toInteger nsec % 10^(9::Int)

{-# LINE 294 "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 36)) stat_ptr :: IO EpochTime
{-# LINE 299 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 303 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    nsec <- ((\hsc_ptr -> peekByteOff hsc_ptr 40)) stat_ptr :: IO (Int32)
{-# LINE 304 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    let frac = toInteger nsec % 10^(9::Int)

{-# LINE 317 "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 44)) stat_ptr :: IO EpochTime
{-# LINE 322 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 326 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    nsec <- ((\hsc_ptr -> peekByteOff hsc_ptr 48)) stat_ptr :: IO (Int32)
{-# LINE 327 "libraries/unix/System/Posix/Files/Common.hsc" #-}
    let frac = toInteger nsec % 10^(9::Int)

{-# LINE 340 "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 (108) 
{-# LINE 378 "libraries/unix/System/Posix/Files/Common.hsc" #-}
  withForeignPtr fp $ \p ->
    throwErrnoIfMinus1_ "getFdStatus" (c_fstat fd p)
  return (FileStatus fp)

-- -----------------------------------------------------------------------------
-- 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 434 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	InputLineLimit			-> (2)
{-# LINE 435 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	InputQueueLimit			-> (3)
{-# LINE 436 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	FileNameLimit			-> (4)
{-# LINE 437 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	PathNameLimit			-> (5)
{-# LINE 438 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	PipeBufferLimit			-> (6)
{-# LINE 439 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	SetOwnerAndGroupIsRestricted	-> (7)
{-# LINE 440 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	FileNamesAreNotTruncated	-> (8)
{-# LINE 441 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	VDisableChar			-> (9)
{-# LINE 442 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 444 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	SyncIOAvailable		-> (25)
{-# LINE 445 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 448 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 450 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	AsyncIOAvailable	-> (17)
{-# LINE 451 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 454 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 456 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	PrioIOAvailable		-> (19)
{-# LINE 457 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 460 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 462 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	FileSizeBits		-> (18)
{-# LINE 463 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 466 "libraries/unix/System/Posix/Files/Common.hsc" #-}


{-# LINE 468 "libraries/unix/System/Posix/Files/Common.hsc" #-}
	SymbolicLinkLimit	-> (24)
{-# LINE 469 "libraries/unix/System/Posix/Files/Common.hsc" #-}

{-# LINE 472 "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