/usr/lib/hugs/packages/base/System/Posix/Internals.hs is in libhugs-base-bundled 98.200609.21-5.4+b3.
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| {-# OPTIONS_GHC -fno-implicit-prelude #-}
-----------------------------------------------------------------------------
-- |
-- Module : System.Posix.Internals
-- Copyright : (c) The University of Glasgow, 1992-2002
-- License : see libraries/base/LICENSE
--
-- Maintainer : cvs-ghc@haskell.org
-- Stability : internal
-- Portability : non-portable (requires POSIX)
--
-- POSIX support layer for the standard libraries.
-- This library is built on *every* platform, including Win32.
--
-- Non-posix compliant in order to support the following features:
-- * S_ISSOCK (no sockets in POSIX)
--
-----------------------------------------------------------------------------
-- #hide
module System.Posix.Internals where
import Control.Monad
import System.Posix.Types
import Foreign
import Foreign.C
import Data.Bits
import Data.Maybe
import System.IO
import Hugs.Prelude (IOException(..), IOErrorType(..))
{-# CFILES cbits/PrelIOUtils.c cbits/dirUtils.c cbits/consUtils.c #-}
-- ---------------------------------------------------------------------------
-- Types
type CDir = ()
type CDirent = ()
type CFLock = ()
type CGroup = ()
type CLconv = ()
type CPasswd = ()
type CSigaction = ()
type CSigset = ()
type CStat = ()
type CTermios = ()
type CTm = ()
type CTms = ()
type CUtimbuf = ()
type CUtsname = ()
type FD = Int
-- ---------------------------------------------------------------------------
-- stat()-related stuff
fdFileSize :: Int -> IO Integer
fdFileSize fd =
allocaBytes sizeof_stat $ \ p_stat -> do
throwErrnoIfMinus1Retry "fileSize" $
c_fstat (fromIntegral fd) p_stat
c_mode <- st_mode p_stat :: IO CMode
if not (s_isreg c_mode)
then return (-1)
else do
c_size <- st_size p_stat :: IO COff
return (fromIntegral c_size)
data FDType = Directory | Stream | RegularFile | RawDevice
deriving (Eq)
fileType :: FilePath -> IO FDType
fileType file =
allocaBytes sizeof_stat $ \ p_stat -> do
withCString file $ \p_file -> do
throwErrnoIfMinus1Retry "fileType" $
c_stat p_file p_stat
statGetType p_stat
-- NOTE: On Win32 platforms, this will only work with file descriptors
-- referring to file handles. i.e., it'll fail for socket FDs.
fdType :: Int -> IO FDType
fdType fd =
allocaBytes sizeof_stat $ \ p_stat -> do
throwErrnoIfMinus1Retry "fdType" $
c_fstat (fromIntegral fd) p_stat
statGetType p_stat
statGetType p_stat = do
c_mode <- st_mode p_stat :: IO CMode
case () of
_ | s_isdir c_mode -> return Directory
| s_isfifo c_mode || s_issock c_mode || s_ischr c_mode
-> return Stream
| s_isreg c_mode -> return RegularFile
-- Q: map char devices to RawDevice too?
| s_isblk c_mode -> return RawDevice
| otherwise -> ioError ioe_unknownfiletype
ioe_unknownfiletype = IOError Nothing UnsupportedOperation "fdType"
"unknown file type" Nothing
fdGetMode :: Int -> IO IOMode
fdGetMode fd = do
flags <- throwErrnoIfMinus1Retry "fdGetMode"
(c_fcntl_read (fromIntegral fd) const_f_getfl)
let
wH = (flags .&. o_WRONLY) /= 0
aH = (flags .&. o_APPEND) /= 0
rwH = (flags .&. o_RDWR) /= 0
mode
| wH && aH = AppendMode
| wH = WriteMode
| rwH = ReadWriteMode
| otherwise = ReadMode
return mode
-- ---------------------------------------------------------------------------
-- Terminal-related stuff
fdIsTTY :: Int -> IO Bool
fdIsTTY fd = c_isatty (fromIntegral fd) >>= return.toBool
setEcho :: Int -> Bool -> IO ()
setEcho fd on = do
tcSetAttr fd $ \ p_tios -> do
c_lflag <- c_lflag p_tios :: IO CTcflag
let new_c_lflag
| on = c_lflag .|. fromIntegral const_echo
| otherwise = c_lflag .&. complement (fromIntegral const_echo)
poke_c_lflag p_tios (new_c_lflag :: CTcflag)
getEcho :: Int -> IO Bool
getEcho fd = do
tcSetAttr fd $ \ p_tios -> do
c_lflag <- c_lflag p_tios :: IO CTcflag
return ((c_lflag .&. fromIntegral const_echo) /= 0)
setCooked :: Int -> Bool -> IO ()
setCooked fd cooked =
tcSetAttr fd $ \ p_tios -> do
-- turn on/off ICANON
c_lflag <- c_lflag p_tios :: IO CTcflag
let new_c_lflag | cooked = c_lflag .|. (fromIntegral const_icanon)
| otherwise = c_lflag .&. complement (fromIntegral const_icanon)
poke_c_lflag p_tios (new_c_lflag :: CTcflag)
-- set VMIN & VTIME to 1/0 respectively
when (not cooked) $ do
c_cc <- ptr_c_cc p_tios
let vmin = (c_cc `plusPtr` (fromIntegral const_vmin)) :: Ptr Word8
vtime = (c_cc `plusPtr` (fromIntegral const_vtime)) :: Ptr Word8
poke vmin 1
poke vtime 0
tcSetAttr :: FD -> (Ptr CTermios -> IO a) -> IO a
tcSetAttr fd fun = do
allocaBytes sizeof_termios $ \p_tios -> do
throwErrnoIfMinus1Retry "tcSetAttr"
(c_tcgetattr (fromIntegral fd) p_tios)
-- tcsetattr() when invoked by a background process causes the process
-- to be sent SIGTTOU regardless of whether the process has TOSTOP set
-- in its terminal flags (try it...). This function provides a
-- wrapper which temporarily blocks SIGTTOU around the call, making it
-- transparent.
allocaBytes sizeof_sigset_t $ \ p_sigset -> do
allocaBytes sizeof_sigset_t $ \ p_old_sigset -> do
c_sigemptyset p_sigset
c_sigaddset p_sigset const_sigttou
c_sigprocmask const_sig_block p_sigset p_old_sigset
r <- fun p_tios -- do the business
throwErrnoIfMinus1Retry_ "tcSetAttr" $
c_tcsetattr (fromIntegral fd) const_tcsanow p_tios
c_sigprocmask const_sig_setmask p_old_sigset nullPtr
return r
-- ---------------------------------------------------------------------------
-- Turning on non-blocking for a file descriptor
setNonBlockingFD fd = do
flags <- throwErrnoIfMinus1Retry "setNonBlockingFD"
(c_fcntl_read (fromIntegral fd) const_f_getfl)
-- An error when setting O_NONBLOCK isn't fatal: on some systems
-- there are certain file handles on which this will fail (eg. /dev/null
-- on FreeBSD) so we throw away the return code from fcntl_write.
unless (testBit flags (fromIntegral o_NONBLOCK)) $ do
c_fcntl_write (fromIntegral fd) const_f_setfl (flags .|. o_NONBLOCK)
return ()
-- -----------------------------------------------------------------------------
-- foreign imports
foreign import ccall unsafe "HsBase.h access"
c_access :: CString -> CMode -> IO CInt
foreign import ccall unsafe "HsBase.h chmod"
c_chmod :: CString -> CMode -> IO CInt
foreign import ccall unsafe "HsBase.h chdir"
c_chdir :: CString -> IO CInt
foreign import ccall unsafe "HsBase.h close"
c_close :: CInt -> IO CInt
foreign import ccall unsafe "HsBase.h closedir"
c_closedir :: Ptr CDir -> IO CInt
foreign import ccall unsafe "HsBase.h creat"
c_creat :: CString -> CMode -> IO CInt
foreign import ccall unsafe "HsBase.h dup"
c_dup :: CInt -> IO CInt
foreign import ccall unsafe "HsBase.h dup2"
c_dup2 :: CInt -> CInt -> IO CInt
foreign import ccall unsafe "HsBase.h __hscore_fstat"
c_fstat :: CInt -> Ptr CStat -> IO CInt
foreign import ccall unsafe "HsBase.h getcwd"
c_getcwd :: Ptr CChar -> CInt -> IO (Ptr CChar)
foreign import ccall unsafe "HsBase.h isatty"
c_isatty :: CInt -> IO CInt
foreign import ccall unsafe "HsBase.h __hscore_lseek"
c_lseek :: CInt -> COff -> CInt -> IO COff
foreign import ccall unsafe "HsBase.h __hscore_lstat"
lstat :: CString -> Ptr CStat -> IO CInt
foreign import ccall unsafe "HsBase.h __hscore_open"
c_open :: CString -> CInt -> CMode -> IO CInt
foreign import ccall unsafe "HsBase.h opendir"
c_opendir :: CString -> IO (Ptr CDir)
foreign import ccall unsafe "HsBase.h __hscore_mkdir"
mkdir :: CString -> CInt -> IO CInt
foreign import ccall unsafe "HsBase.h read"
c_read :: CInt -> Ptr CChar -> CSize -> IO CSsize
foreign import ccall unsafe "dirUtils.h __hscore_renameFile"
c_rename :: CString -> CString -> IO CInt
foreign import ccall unsafe "HsBase.h rewinddir"
c_rewinddir :: Ptr CDir -> IO ()
foreign import ccall unsafe "HsBase.h rmdir"
c_rmdir :: CString -> IO CInt
foreign import ccall unsafe "HsBase.h __hscore_stat"
c_stat :: CString -> Ptr CStat -> IO CInt
foreign import ccall unsafe "HsBase.h umask"
c_umask :: CMode -> IO CMode
foreign import ccall unsafe "HsBase.h write"
c_write :: CInt -> Ptr CChar -> CSize -> IO CSsize
foreign import ccall unsafe "HsBase.h __hscore_ftruncate"
c_ftruncate :: CInt -> COff -> IO CInt
foreign import ccall unsafe "HsBase.h unlink"
c_unlink :: CString -> IO CInt
foreign import ccall unsafe "HsBase.h getpid"
c_getpid :: IO CPid
foreign import ccall unsafe "HsBase.h fcntl"
c_fcntl_read :: CInt -> CInt -> IO CInt
foreign import ccall unsafe "HsBase.h fcntl"
c_fcntl_write :: CInt -> CInt -> CInt -> IO CInt
foreign import ccall unsafe "HsBase.h fcntl"
c_fcntl_lock :: CInt -> CInt -> Ptr CFLock -> IO CInt
foreign import ccall unsafe "HsBase.h fork"
c_fork :: IO CPid
foreign import ccall unsafe "HsBase.h link"
c_link :: CString -> CString -> IO CInt
foreign import ccall unsafe "HsBase.h mkfifo"
c_mkfifo :: CString -> CMode -> IO CInt
foreign import ccall unsafe "HsBase.h pipe"
c_pipe :: Ptr CInt -> IO CInt
foreign import ccall unsafe "HsBase.h __hscore_sigemptyset"
c_sigemptyset :: Ptr CSigset -> IO CInt
foreign import ccall unsafe "HsBase.h __hscore_sigaddset"
c_sigaddset :: Ptr CSigset -> CInt -> IO CInt
foreign import ccall unsafe "HsBase.h sigprocmask"
c_sigprocmask :: CInt -> Ptr CSigset -> Ptr CSigset -> IO CInt
foreign import ccall unsafe "HsBase.h tcgetattr"
c_tcgetattr :: CInt -> Ptr CTermios -> IO CInt
foreign import ccall unsafe "HsBase.h tcsetattr"
c_tcsetattr :: CInt -> CInt -> Ptr CTermios -> IO CInt
foreign import ccall unsafe "HsBase.h utime"
c_utime :: CString -> Ptr CUtimbuf -> IO CMode
foreign import ccall unsafe "HsBase.h waitpid"
c_waitpid :: CPid -> Ptr CInt -> CInt -> IO CPid
-- traversing directories
foreign import ccall unsafe "dirUtils.h __hscore_readdir"
readdir :: Ptr CDir -> Ptr (Ptr CDirent) -> IO CInt
foreign import ccall unsafe "HsBase.h __hscore_free_dirent"
freeDirEnt :: Ptr CDirent -> IO ()
foreign import ccall unsafe "HsBase.h __hscore_end_of_dir"
end_of_dir :: CInt
foreign import ccall unsafe "HsBase.h __hscore_d_name"
d_name :: Ptr CDirent -> IO CString
-- POSIX flags only:
foreign import ccall unsafe "HsBase.h __hscore_o_rdonly" o_RDONLY :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_wronly" o_WRONLY :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_rdwr" o_RDWR :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_append" o_APPEND :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_creat" o_CREAT :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_excl" o_EXCL :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_trunc" o_TRUNC :: CInt
-- non-POSIX flags.
foreign import ccall unsafe "HsBase.h __hscore_o_noctty" o_NOCTTY :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_nonblock" o_NONBLOCK :: CInt
foreign import ccall unsafe "HsBase.h __hscore_o_binary" o_BINARY :: CInt
foreign import ccall unsafe "HsBase.h __hscore_s_isreg" s_isreg :: CMode -> Bool
foreign import ccall unsafe "HsBase.h __hscore_s_ischr" s_ischr :: CMode -> Bool
foreign import ccall unsafe "HsBase.h __hscore_s_isblk" s_isblk :: CMode -> Bool
foreign import ccall unsafe "HsBase.h __hscore_s_isdir" s_isdir :: CMode -> Bool
foreign import ccall unsafe "HsBase.h __hscore_s_isfifo" s_isfifo :: CMode -> Bool
foreign import ccall unsafe "HsBase.h __hscore_sizeof_stat" sizeof_stat :: Int
foreign import ccall unsafe "HsBase.h __hscore_st_mtime" st_mtime :: Ptr CStat -> IO CTime
foreign import ccall unsafe "HsBase.h __hscore_st_size" st_size :: Ptr CStat -> IO COff
foreign import ccall unsafe "HsBase.h __hscore_st_mode" st_mode :: Ptr CStat -> IO CMode
foreign import ccall unsafe "HsBase.h __hscore_echo" const_echo :: CInt
foreign import ccall unsafe "HsBase.h __hscore_tcsanow" const_tcsanow :: CInt
foreign import ccall unsafe "HsBase.h __hscore_icanon" const_icanon :: CInt
foreign import ccall unsafe "HsBase.h __hscore_vmin" const_vmin :: CInt
foreign import ccall unsafe "HsBase.h __hscore_vtime" const_vtime :: CInt
foreign import ccall unsafe "HsBase.h __hscore_sigttou" const_sigttou :: CInt
foreign import ccall unsafe "HsBase.h __hscore_sig_block" const_sig_block :: CInt
foreign import ccall unsafe "HsBase.h __hscore_sig_setmask" const_sig_setmask :: CInt
foreign import ccall unsafe "HsBase.h __hscore_f_getfl" const_f_getfl :: CInt
foreign import ccall unsafe "HsBase.h __hscore_f_setfl" const_f_setfl :: CInt
foreign import ccall unsafe "HsBase.h __hscore_sizeof_termios" sizeof_termios :: Int
foreign import ccall unsafe "HsBase.h __hscore_sizeof_sigset_t" sizeof_sigset_t :: Int
foreign import ccall unsafe "HsBase.h __hscore_lflag" c_lflag :: Ptr CTermios -> IO CTcflag
foreign import ccall unsafe "HsBase.h __hscore_poke_lflag" poke_c_lflag :: Ptr CTermios -> CTcflag -> IO ()
foreign import ccall unsafe "HsBase.h __hscore_ptr_c_cc" ptr_c_cc :: Ptr CTermios -> IO (Ptr Word8)
foreign import ccall unsafe "HsBase.h __hscore_s_issock" s_issock :: CMode -> Bool
|