System/Posix/Internals.hs

   1 {-# LANGUAGE Trustworthy #-}
   2 {-# LANGUAGE CPP, NoImplicitPrelude, ForeignFunctionInterface #-}
   3 {-# OPTIONS_HADDOCK hide #-}
   4
   5 -----------------------------------------------------------------------------
   6 -- |
   7 -- Module      :  System.Posix.Internals
   8 -- Copyright   :  (c) The University of Glasgow, 1992-2002
   9 -- License     :  see libraries/base/LICENSE
  10 --
  11 -- Maintainer  :  cvs-ghc@haskell.org
  12 -- Stability   :  internal
  13 -- Portability :  non-portable (requires POSIX)
  14 --
  15 -- POSIX support layer for the standard libraries.
  16 -- This library is built on *every* platform, including Win32.
  17 --
  18 -- Non-posix compliant in order to support the following features:
  19 --      * S_ISSOCK (no sockets in POSIX)
  20 --
  21 -----------------------------------------------------------------------------
  22
  23 -- #hide
  24 module System.Posix.Internals where
  25
  26 #ifdef __NHC__
  27 #define HTYPE_TCFLAG_T
  28 #else
  29 # include "HsBaseConfig.h"
  30 #endif
  31
  32 #if ! (defined(mingw32_HOST_OS) || defined(__MINGW32__))
  33 import Control.Monad
  34 #endif
  35 import System.Posix.Types
  36
  37 import Foreign
  38 import Foreign.C
  39
  40 -- import Data.Bits
  41 import Data.Maybe
  42
  43 #if !defined(HTYPE_TCFLAG_T)
  44 import System.IO.Error
  45 #endif
  46
  47 #if __GLASGOW_HASKELL__
  48 import GHC.Base
  49 import GHC.Num
  50 import GHC.Real
  51 import GHC.IO
  52 import GHC.IO.IOMode
  53 import GHC.IO.Exception
  54 import GHC.IO.Device
  55 #ifndef mingw32_HOST_OS
  56 import {-# SOURCE #-} GHC.IO.Encoding (getFileSystemEncoding)
  57 import qualified GHC.Foreign as GHC
  58 #endif
  59 #elif __HUGS__
  60 import Hugs.Prelude (IOException(..), IOErrorType(..))
  61 import Hugs.IO (IOMode(..))
  62 #elif __NHC__
  63 import GHC.IO.Device    -- yes, I know, but its portable, really!
  64 import System.IO
  65 import Control.Exception
  66 import DIOError
  67 #endif
  68
  69 #ifdef __HUGS__
  70 {-# CFILES cbits/PrelIOUtils.c cbits/consUtils.c #-}
  71 #endif
  72
  73
  74 -- ---------------------------------------------------------------------------
  75 -- Debugging the base package
  76
  77 puts :: String -> IO ()
  78 puts s = withCAStringLen (s ++ "\n") $ \(p, len) -> do
  79             -- In reality should be withCString, but assume ASCII to avoid loop
  80             -- if this is called by GHC.Foreign
  81            _ <- c_write 1 (castPtr p) (fromIntegral len)
  82            return ()
  83
  84
  85 -- ---------------------------------------------------------------------------
  86 -- Types
  87
  88 type CFLock     = ()
  89 type CGroup     = ()
  90 type CLconv     = ()
  91 type CPasswd    = ()
  92 type CSigaction = ()
  93 type CSigset    = ()
  94 type CStat      = ()
  95 type CTermios   = ()
  96 type CTm        = ()
  97 type CTms       = ()
  98 type CUtimbuf   = ()
  99 type CUtsname   = ()
 100
 101 type FD = CInt
 102
 103 -- ---------------------------------------------------------------------------
 104 -- stat()-related stuff
 105
 106 fdFileSize :: FD -> IO Integer
 107 fdFileSize fd =
 108   allocaBytes sizeof_stat $ \ p_stat -> do
 109     throwErrnoIfMinus1Retry_ "fileSize" $
 110         c_fstat fd p_stat
 111     c_mode <- st_mode p_stat :: IO CMode
 112     if not (s_isreg c_mode)
 113         then return (-1)
 114         else do
 115       c_size <- st_size p_stat
 116       return (fromIntegral c_size)
 117
 118 fileType :: FilePath -> IO IODeviceType
 119 fileType file =
 120   allocaBytes sizeof_stat $ \ p_stat -> do
 121   withFilePath file $ \p_file -> do
 122     throwErrnoIfMinus1Retry_ "fileType" $
 123       c_stat p_file p_stat
 124     statGetType p_stat
 125
 126 -- NOTE: On Win32 platforms, this will only work with file descriptors
 127 -- referring to file handles. i.e., it'll fail for socket FDs.
 128 fdStat :: FD -> IO (IODeviceType, CDev, CIno)
 129 fdStat fd =
 130   allocaBytes sizeof_stat $ \ p_stat -> do
 131     throwErrnoIfMinus1Retry_ "fdType" $
 132         c_fstat fd p_stat
 133     ty <- statGetType p_stat
 134     dev <- st_dev p_stat
 135     ino <- st_ino p_stat
 136     return (ty,dev,ino)
 137
 138 fdType :: FD -> IO IODeviceType
 139 fdType fd = do (ty,_,_) <- fdStat fd; return ty
 140
 141 statGetType :: Ptr CStat -> IO IODeviceType
 142 statGetType p_stat = do
 143   c_mode <- st_mode p_stat :: IO CMode
 144   case () of
 145       _ | s_isdir c_mode        -> return Directory
 146         | s_isfifo c_mode || s_issock c_mode || s_ischr  c_mode
 147                                 -> return Stream
 148         | s_isreg c_mode        -> return RegularFile
 149          -- Q: map char devices to RawDevice too?
 150         | s_isblk c_mode        -> return RawDevice
 151         | otherwise             -> ioError ioe_unknownfiletype
 152
 153 ioe_unknownfiletype :: IOException
 154 #ifndef __NHC__
 155 ioe_unknownfiletype = IOError Nothing UnsupportedOperation "fdType"
 156                         "unknown file type"
 157 #  if __GLASGOW_HASKELL__
 158                         Nothing
 159 #  endif
 160                         Nothing
 161 #else
 162 ioe_unknownfiletype = UserError "fdType" "unknown file type"
 163 #endif
 164
 165 fdGetMode :: FD -> IO IOMode
 166 #if defined(mingw32_HOST_OS) || defined(__MINGW32__)
 167 fdGetMode _ = do
 168     -- We don't have a way of finding out which flags are set on FDs
 169     -- on Windows, so make a handle that thinks that anything goes.
 170     let flags = o_RDWR
 171 #else
 172 fdGetMode fd = do
 173     flags <- throwErrnoIfMinus1Retry "fdGetMode"
 174                 (c_fcntl_read fd const_f_getfl)
 175 #endif
 176     let
 177        wH  = (flags .&. o_WRONLY) /= 0
 178        aH  = (flags .&. o_APPEND) /= 0
 179        rwH = (flags .&. o_RDWR) /= 0
 180
 181        mode
 182          | wH && aH  = AppendMode
 183          | wH        = WriteMode
 184          | rwH       = ReadWriteMode
 185          | otherwise = ReadMode
 186
 187     return mode
 188
 189 #ifdef mingw32_HOST_OS
 190 withFilePath :: FilePath -> (CWString -> IO a) -> IO a
 191 withFilePath = withCWString
 192
 193 peekFilePath :: CWString -> IO FilePath
 194 peekFilePath = peekCWString
 195 #else
 196
 197 withFilePath :: FilePath -> (CString -> IO a) -> IO a
 198 peekFilePath :: CString -> IO FilePath
 199 peekFilePathLen :: CStringLen -> IO FilePath
 200
 201 #if __GLASGOW_HASKELL__
 202 withFilePath fp f = getFileSystemEncoding >>= \enc -> GHC.withCString enc fp f
 203 peekFilePath fp = getFileSystemEncoding >>= \enc -> GHC.peekCString enc fp
 204 peekFilePathLen fp = getFileSystemEncoding >>= \enc -> GHC.peekCStringLen enc fp
 205 #else
 206 withFilePath = withCString
 207 peekFilePath = peekCString
 208 peekFilePathLen = peekCStringLen
 209 #endif
 210
 211 #endif
 212
 213 -- ---------------------------------------------------------------------------
 214 -- Terminal-related stuff
 215
 216 #if defined(HTYPE_TCFLAG_T)
 217
 218 setEcho :: FD -> Bool -> IO ()
 219 setEcho fd on = do
 220   tcSetAttr fd $ \ p_tios -> do
 221     lflag <- c_lflag p_tios :: IO CTcflag
 222     let new_lflag
 223          | on        = lflag .|. fromIntegral const_echo
 224          | otherwise = lflag .&. complement (fromIntegral const_echo)
 225     poke_c_lflag p_tios (new_lflag :: CTcflag)
 226
 227 getEcho :: FD -> IO Bool
 228 getEcho fd = do
 229   tcSetAttr fd $ \ p_tios -> do
 230     lflag <- c_lflag p_tios :: IO CTcflag
 231     return ((lflag .&. fromIntegral const_echo) /= 0)
 232
 233 setCooked :: FD -> Bool -> IO ()
 234 setCooked fd cooked =
 235   tcSetAttr fd $ \ p_tios -> do
 236
 237     -- turn on/off ICANON
 238     lflag <- c_lflag p_tios :: IO CTcflag
 239     let new_lflag | cooked    = lflag .|. (fromIntegral const_icanon)
 240                   | otherwise = lflag .&. complement (fromIntegral const_icanon)
 241     poke_c_lflag p_tios (new_lflag :: CTcflag)
 242
 243     -- set VMIN & VTIME to 1/0 respectively
 244     when (not cooked) $ do
 245             c_cc <- ptr_c_cc p_tios
 246             let vmin  = (c_cc `plusPtr` (fromIntegral const_vmin))  :: Ptr Word8
 247                 vtime = (c_cc `plusPtr` (fromIntegral const_vtime)) :: Ptr Word8
 248             poke vmin  1
 249             poke vtime 0
 250
 251 tcSetAttr :: FD -> (Ptr CTermios -> IO a) -> IO a
 252 tcSetAttr fd fun = do
 253      allocaBytes sizeof_termios  $ \p_tios -> do
 254         throwErrnoIfMinus1Retry_ "tcSetAttr"
 255            (c_tcgetattr fd p_tios)
 256
 257 #ifdef __GLASGOW_HASKELL__
 258         -- Save a copy of termios, if this is a standard file descriptor.
 259         -- These terminal settings are restored in hs_exit().
 260         when (fd <= 2) $ do
 261           p <- get_saved_termios fd
 262           when (p == nullPtr) $ do
 263              saved_tios <- mallocBytes sizeof_termios
 264              copyBytes saved_tios p_tios sizeof_termios
 265              set_saved_termios fd saved_tios
 266 #endif
 267
 268         -- tcsetattr() when invoked by a background process causes the process
 269         -- to be sent SIGTTOU regardless of whether the process has TOSTOP set
 270         -- in its terminal flags (try it...).  This function provides a
 271         -- wrapper which temporarily blocks SIGTTOU around the call, making it
 272         -- transparent.
 273         allocaBytes sizeof_sigset_t $ \ p_sigset -> do
 274           allocaBytes sizeof_sigset_t $ \ p_old_sigset -> do
 275              throwErrnoIfMinus1_ "sigemptyset" $
 276                  c_sigemptyset p_sigset
 277              throwErrnoIfMinus1_ "sigaddset" $
 278                  c_sigaddset   p_sigset const_sigttou
 279              throwErrnoIfMinus1_ "sigprocmask" $
 280                  c_sigprocmask const_sig_block p_sigset p_old_sigset
 281              r <- fun p_tios  -- do the business
 282              throwErrnoIfMinus1Retry_ "tcSetAttr" $
 283                  c_tcsetattr fd const_tcsanow p_tios
 284              throwErrnoIfMinus1_ "sigprocmask" $
 285                  c_sigprocmask const_sig_setmask p_old_sigset nullPtr
 286              return r
 287
 288 #ifdef __GLASGOW_HASKELL__
 289 foreign import ccall unsafe "HsBase.h __hscore_get_saved_termios"
 290    get_saved_termios :: CInt -> IO (Ptr CTermios)
 291
 292 foreign import ccall unsafe "HsBase.h __hscore_set_saved_termios"
 293    set_saved_termios :: CInt -> (Ptr CTermios) -> IO ()
 294 #endif
 295
 296 #else
 297
 298 -- 'raw' mode for Win32 means turn off 'line input' (=> buffering and
 299 -- character translation for the console.) The Win32 API for doing
 300 -- this is GetConsoleMode(), which also requires echoing to be disabled
 301 -- when turning off 'line input' processing. Notice that turning off
 302 -- 'line input' implies enter/return is reported as '\r' (and it won't
 303 -- report that character until another character is input..odd.) This
 304 -- latter feature doesn't sit too well with IO actions like IO.hGetLine..
 305 -- consider yourself warned.
 306 setCooked :: FD -> Bool -> IO ()
 307 setCooked fd cooked = do
 308   x <- set_console_buffering fd (if cooked then 1 else 0)
 309   if (x /= 0)
 310    then ioError (ioe_unk_error "setCooked" "failed to set buffering")
 311    else return ()
 312
 313 ioe_unk_error :: String -> String -> IOException
 314 ioe_unk_error loc msg
 315 #ifndef __NHC__
 316  = ioeSetErrorString (mkIOError OtherError loc Nothing Nothing) msg
 317 #else
 318  = UserError loc msg
 319 #endif
 320
 321 -- Note: echoing goes hand in hand with enabling 'line input' / raw-ness
 322 -- for Win32 consoles, hence setEcho ends up being the inverse of setCooked.
 323 setEcho :: FD -> Bool -> IO ()
 324 setEcho fd on = do
 325   x <- set_console_echo fd (if on then 1 else 0)
 326   if (x /= 0)
 327    then ioError (ioe_unk_error "setEcho" "failed to set echoing")
 328    else return ()
 329
 330 getEcho :: FD -> IO Bool
 331 getEcho fd = do
 332   r <- get_console_echo fd
 333   if (r == (-1))
 334    then ioError (ioe_unk_error "getEcho" "failed to get echoing")
 335    else return (r == 1)
 336
 337 foreign import ccall unsafe "consUtils.h set_console_buffering__"
 338    set_console_buffering :: CInt -> CInt -> IO CInt
 339
 340 foreign import ccall unsafe "consUtils.h set_console_echo__"
 341    set_console_echo :: CInt -> CInt -> IO CInt
 342
 343 foreign import ccall unsafe "consUtils.h get_console_echo__"
 344    get_console_echo :: CInt -> IO CInt
 345
 346 foreign import ccall unsafe "consUtils.h is_console__"
 347    is_console :: CInt -> IO CInt
 348
 349 #endif
 350
 351 -- ---------------------------------------------------------------------------
 352 -- Turning on non-blocking for a file descriptor
 353
 354 setNonBlockingFD :: FD -> Bool -> IO ()
 355 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 356 setNonBlockingFD fd set = do
 357   flags <- throwErrnoIfMinus1Retry "setNonBlockingFD"
 358                  (c_fcntl_read fd const_f_getfl)
 359   let flags' | set       = flags .|. o_NONBLOCK
 360              | otherwise = flags .&. complement o_NONBLOCK
 361   unless (flags == flags') $ do
 362     -- An error when setting O_NONBLOCK isn't fatal: on some systems
 363     -- there are certain file handles on which this will fail (eg. /dev/null
 364     -- on FreeBSD) so we throw away the return code from fcntl_write.
 365     _ <- c_fcntl_write fd const_f_setfl (fromIntegral flags')
 366     return ()
 367 #else
 368
 369 -- bogus defns for win32
 370 setNonBlockingFD _ _ = return ()
 371
 372 #endif
 373
 374 -- -----------------------------------------------------------------------------
 375 -- Set close-on-exec for a file descriptor
 376
 377 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 378 setCloseOnExec :: FD -> IO ()
 379 setCloseOnExec fd = do
 380   throwErrnoIfMinus1_ "setCloseOnExec" $
 381     c_fcntl_write fd const_f_setfd const_fd_cloexec
 382 #endif
 383
 384 -- -----------------------------------------------------------------------------
 385 -- foreign imports
 386
 387 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 388 type CFilePath = CString
 389 #else
 390 type CFilePath = CWString
 391 #endif
 392
 393 foreign import ccall unsafe "HsBase.h access"
 394    c_access :: CString -> CInt -> IO CInt
 395
 396 foreign import ccall unsafe "HsBase.h chmod"
 397    c_chmod :: CString -> CMode -> IO CInt
 398
 399 foreign import ccall unsafe "HsBase.h close"
 400    c_close :: CInt -> IO CInt
 401
 402 foreign import ccall unsafe "HsBase.h creat"
 403    c_creat :: CString -> CMode -> IO CInt
 404
 405 foreign import ccall unsafe "HsBase.h dup"
 406    c_dup :: CInt -> IO CInt
 407
 408 foreign import ccall unsafe "HsBase.h dup2"
 409    c_dup2 :: CInt -> CInt -> IO CInt
 410
 411 foreign import ccall unsafe "HsBase.h __hscore_fstat"
 412    c_fstat :: CInt -> Ptr CStat -> IO CInt
 413
 414 foreign import ccall unsafe "HsBase.h isatty"
 415    c_isatty :: CInt -> IO CInt
 416
 417 #if defined(mingw32_HOST_OS) || defined(__MINGW32__)
 418 foreign import ccall unsafe "HsBase.h __hscore_lseek"
 419    c_lseek :: CInt -> Int64 -> CInt -> IO Int64
 420 #else
 421 foreign import ccall unsafe "HsBase.h __hscore_lseek"
 422    c_lseek :: CInt -> COff -> CInt -> IO COff
 423 #endif
 424
 425 foreign import ccall unsafe "HsBase.h __hscore_lstat"
 426    lstat :: CFilePath -> Ptr CStat -> IO CInt
 427
 428 foreign import ccall unsafe "HsBase.h __hscore_open"
 429    c_open :: CFilePath -> CInt -> CMode -> IO CInt
 430
 431 foreign import ccall safe "HsBase.h __hscore_open"
 432    c_safe_open :: CFilePath -> CInt -> CMode -> IO CInt
 433
 434 foreign import ccall unsafe "HsBase.h read"
 435    c_read :: CInt -> Ptr Word8 -> CSize -> IO CSsize
 436
 437 foreign import ccall safe "HsBase.h read"
 438    c_safe_read :: CInt -> Ptr Word8 -> CSize -> IO CSsize
 439
 440 foreign import ccall unsafe "HsBase.h __hscore_stat"
 441    c_stat :: CFilePath -> Ptr CStat -> IO CInt
 442
 443 foreign import ccall unsafe "HsBase.h umask"
 444    c_umask :: CMode -> IO CMode
 445
 446 foreign import ccall unsafe "HsBase.h write"
 447    c_write :: CInt -> Ptr Word8 -> CSize -> IO CSsize
 448
 449 foreign import ccall safe "HsBase.h write"
 450    c_safe_write :: CInt -> Ptr Word8 -> CSize -> IO CSsize
 451
 452 foreign import ccall unsafe "HsBase.h __hscore_ftruncate"
 453    c_ftruncate :: CInt -> COff -> IO CInt
 454
 455 foreign import ccall unsafe "HsBase.h unlink"
 456    c_unlink :: CString -> IO CInt
 457
 458 foreign import ccall unsafe "HsBase.h getpid"
 459    c_getpid :: IO CPid
 460
 461 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 462 foreign import ccall unsafe "HsBase.h fcntl_read"
 463    c_fcntl_read  :: CInt -> CInt -> IO CInt
 464
 465 foreign import ccall unsafe "HsBase.h fcntl_write"
 466    c_fcntl_write :: CInt -> CInt -> CLong -> IO CInt
 467
 468 foreign import ccall unsafe "HsBase.h fcntl_lock"
 469    c_fcntl_lock  :: CInt -> CInt -> Ptr CFLock -> IO CInt
 470
 471 foreign import ccall unsafe "HsBase.h fork"
 472    c_fork :: IO CPid
 473
 474 foreign import ccall unsafe "HsBase.h link"
 475    c_link :: CString -> CString -> IO CInt
 476
 477 foreign import ccall unsafe "HsBase.h mkfifo"
 478    c_mkfifo :: CString -> CMode -> IO CInt
 479
 480 foreign import ccall unsafe "HsBase.h pipe"
 481    c_pipe :: Ptr CInt -> IO CInt
 482
 483 foreign import ccall unsafe "HsBase.h __hscore_sigemptyset"
 484    c_sigemptyset :: Ptr CSigset -> IO CInt
 485
 486 foreign import ccall unsafe "HsBase.h __hscore_sigaddset"
 487    c_sigaddset :: Ptr CSigset -> CInt -> IO CInt
 488
 489 foreign import ccall unsafe "HsBase.h sigprocmask"
 490    c_sigprocmask :: CInt -> Ptr CSigset -> Ptr CSigset -> IO CInt
 491
 492 foreign import ccall unsafe "HsBase.h tcgetattr"
 493    c_tcgetattr :: CInt -> Ptr CTermios -> IO CInt
 494
 495 foreign import ccall unsafe "HsBase.h tcsetattr"
 496    c_tcsetattr :: CInt -> CInt -> Ptr CTermios -> IO CInt
 497
 498 foreign import ccall unsafe "HsBase.h __hscore_utime"
 499    c_utime :: CString -> Ptr CUtimbuf -> IO CInt
 500
 501 foreign import ccall unsafe "HsBase.h waitpid"
 502    c_waitpid :: CPid -> Ptr CInt -> CInt -> IO CPid
 503 #endif
 504
 505 -- POSIX flags only:
 506 foreign import ccall unsafe "HsBase.h __hscore_o_rdonly" o_RDONLY :: CInt
 507 foreign import ccall unsafe "HsBase.h __hscore_o_wronly" o_WRONLY :: CInt
 508 foreign import ccall unsafe "HsBase.h __hscore_o_rdwr"   o_RDWR   :: CInt
 509 foreign import ccall unsafe "HsBase.h __hscore_o_append" o_APPEND :: CInt
 510 foreign import ccall unsafe "HsBase.h __hscore_o_creat"  o_CREAT  :: CInt
 511 foreign import ccall unsafe "HsBase.h __hscore_o_excl"   o_EXCL   :: CInt
 512 foreign import ccall unsafe "HsBase.h __hscore_o_trunc"  o_TRUNC  :: CInt
 513
 514 -- non-POSIX flags.
 515 foreign import ccall unsafe "HsBase.h __hscore_o_noctty"   o_NOCTTY   :: CInt
 516 foreign import ccall unsafe "HsBase.h __hscore_o_nonblock" o_NONBLOCK :: CInt
 517 foreign import ccall unsafe "HsBase.h __hscore_o_binary"   o_BINARY   :: CInt
 518
 519 foreign import ccall unsafe "HsBase.h __hscore_s_isreg"  c_s_isreg  :: CMode -> CInt
 520 foreign import ccall unsafe "HsBase.h __hscore_s_ischr"  c_s_ischr  :: CMode -> CInt
 521 foreign import ccall unsafe "HsBase.h __hscore_s_isblk"  c_s_isblk  :: CMode -> CInt
 522 foreign import ccall unsafe "HsBase.h __hscore_s_isdir"  c_s_isdir  :: CMode -> CInt
 523 foreign import ccall unsafe "HsBase.h __hscore_s_isfifo" c_s_isfifo :: CMode -> CInt
 524
 525 s_isreg  :: CMode -> Bool
 526 s_isreg cm = c_s_isreg cm /= 0
 527 s_ischr  :: CMode -> Bool
 528 s_ischr cm = c_s_ischr cm /= 0
 529 s_isblk  :: CMode -> Bool
 530 s_isblk cm = c_s_isblk cm /= 0
 531 s_isdir  :: CMode -> Bool
 532 s_isdir cm = c_s_isdir cm /= 0
 533 s_isfifo :: CMode -> Bool
 534 s_isfifo cm = c_s_isfifo cm /= 0
 535
 536 foreign import ccall unsafe "HsBase.h __hscore_sizeof_stat" sizeof_stat :: Int
 537 foreign import ccall unsafe "HsBase.h __hscore_st_mtime" st_mtime :: Ptr CStat -> IO CTime
 538 #ifdef mingw32_HOST_OS
 539 foreign import ccall unsafe "HsBase.h __hscore_st_size" st_size :: Ptr CStat -> IO Int64
 540 #else
 541 foreign import ccall unsafe "HsBase.h __hscore_st_size" st_size :: Ptr CStat -> IO COff
 542 #endif
 543 foreign import ccall unsafe "HsBase.h __hscore_st_mode" st_mode :: Ptr CStat -> IO CMode
 544 foreign import ccall unsafe "HsBase.h __hscore_st_dev" st_dev :: Ptr CStat -> IO CDev
 545 foreign import ccall unsafe "HsBase.h __hscore_st_ino" st_ino :: Ptr CStat -> IO CIno
 546
 547 foreign import ccall unsafe "HsBase.h __hscore_echo"         const_echo :: CInt
 548 foreign import ccall unsafe "HsBase.h __hscore_tcsanow"      const_tcsanow :: CInt
 549 foreign import ccall unsafe "HsBase.h __hscore_icanon"       const_icanon :: CInt
 550 foreign import ccall unsafe "HsBase.h __hscore_vmin"         const_vmin   :: CInt
 551 foreign import ccall unsafe "HsBase.h __hscore_vtime"        const_vtime  :: CInt
 552 foreign import ccall unsafe "HsBase.h __hscore_sigttou"      const_sigttou :: CInt
 553 foreign import ccall unsafe "HsBase.h __hscore_sig_block"    const_sig_block :: CInt
 554 foreign import ccall unsafe "HsBase.h __hscore_sig_setmask"  const_sig_setmask :: CInt
 555 foreign import ccall unsafe "HsBase.h __hscore_f_getfl"      const_f_getfl :: CInt
 556 foreign import ccall unsafe "HsBase.h __hscore_f_setfl"      const_f_setfl :: CInt
 557 foreign import ccall unsafe "HsBase.h __hscore_f_setfd"      const_f_setfd :: CInt
 558 foreign import ccall unsafe "HsBase.h __hscore_fd_cloexec"   const_fd_cloexec :: CLong
 559
 560 #if defined(HTYPE_TCFLAG_T)
 561 foreign import ccall unsafe "HsBase.h __hscore_sizeof_termios"  sizeof_termios :: Int
 562 foreign import ccall unsafe "HsBase.h __hscore_sizeof_sigset_t" sizeof_sigset_t :: Int
 563
 564 foreign import ccall unsafe "HsBase.h __hscore_lflag" c_lflag :: Ptr CTermios -> IO CTcflag
 565 foreign import ccall unsafe "HsBase.h __hscore_poke_lflag" poke_c_lflag :: Ptr CTermios -> CTcflag -> IO ()
 566 foreign import ccall unsafe "HsBase.h __hscore_ptr_c_cc" ptr_c_cc  :: Ptr CTermios -> IO (Ptr Word8)
 567 #endif
 568
 569 s_issock :: CMode -> Bool
 570 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 571 s_issock cmode = c_s_issock cmode /= 0
 572 foreign import ccall unsafe "HsBase.h __hscore_s_issock" c_s_issock :: CMode -> CInt
 573 #else
 574 s_issock _ = False
 575 #endif
 576
 577 foreign import ccall unsafe "__hscore_bufsiz"   dEFAULT_BUFFER_SIZE :: Int
 578 foreign import ccall unsafe "__hscore_seek_cur" sEEK_CUR :: CInt
 579 foreign import ccall unsafe "__hscore_seek_set" sEEK_SET :: CInt
 580 foreign import ccall unsafe "__hscore_seek_end" sEEK_END :: CInt
 581