System/Posix/Internals.hs

   1 {-# OPTIONS_GHC -XNoImplicitPrelude #-}
   2 {-# OPTIONS_GHC -fno-warn-unused-binds #-}
   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 #ifndef __NHC__
  27 # include "HsBaseConfig.h"
  28 #endif
  29
  30 #if ! (defined(mingw32_HOST_OS) || defined(__MINGW32__))
  31 import Control.Monad
  32 #endif
  33 import System.Posix.Types
  34
  35 import Foreign
  36 import Foreign.C
  37
  38 import Data.Bits
  39 import Data.Maybe
  40
  41 #if !defined(HTYPE_TCFLAG_T)
  42 import System.IO.Error
  43 #endif
  44
  45 #if __GLASGOW_HASKELL__
  46 import GHC.Base
  47 import GHC.Num
  48 import GHC.Real
  49 import GHC.IOBase
  50 #elif __HUGS__
  51 import Hugs.Prelude (IOException(..), IOErrorType(..))
  52 import Hugs.IO (IOMode(..))
  53 #elif __NHC__
  54 import System.IO
  55 import Control.Exception
  56 import DIOError
  57 #endif
  58
  59 #ifdef __HUGS__
  60 {-# CFILES cbits/PrelIOUtils.c cbits/dirUtils.c cbits/consUtils.c #-}
  61 #endif
  62
  63 -- ---------------------------------------------------------------------------
  64 -- Types
  65
  66 type CDir       = ()
  67 type CDirent    = ()
  68 type CFLock     = ()
  69 type CGroup     = ()
  70 type CLconv     = ()
  71 type CPasswd    = ()
  72 type CSigaction = ()
  73 type CSigset    = ()
  74 type CStat      = ()
  75 type CTermios   = ()
  76 type CTm        = ()
  77 type CTms       = ()
  78 type CUtimbuf   = ()
  79 type CUtsname   = ()
  80
  81 #ifndef __GLASGOW_HASKELL__
  82 type FD = CInt
  83 #endif
  84
  85 -- ---------------------------------------------------------------------------
  86 -- stat()-related stuff
  87
  88 fdFileSize :: FD -> IO Integer
  89 fdFileSize fd =
  90   allocaBytes sizeof_stat $ \ p_stat -> do
  91     throwErrnoIfMinus1Retry "fileSize" $
  92         c_fstat fd p_stat
  93     c_mode <- st_mode p_stat :: IO CMode
  94     if not (s_isreg c_mode)
  95         then return (-1)
  96         else do
  97       c_size <- st_size p_stat
  98       return (fromIntegral c_size)
  99
 100 data FDType  = Directory | Stream | RegularFile | RawDevice
 101                deriving (Eq)
 102
 103 fileType :: FilePath -> IO FDType
 104 fileType file =
 105   allocaBytes sizeof_stat $ \ p_stat -> do
 106   withCString file $ \p_file -> do
 107     throwErrnoIfMinus1Retry "fileType" $
 108       c_stat p_file p_stat
 109     statGetType p_stat
 110
 111 -- NOTE: On Win32 platforms, this will only work with file descriptors
 112 -- referring to file handles. i.e., it'll fail for socket FDs.
 113 fdStat :: FD -> IO (FDType, CDev, CIno)
 114 fdStat fd =
 115   allocaBytes sizeof_stat $ \ p_stat -> do
 116     throwErrnoIfMinus1Retry "fdType" $
 117         c_fstat fd p_stat
 118     ty <- statGetType p_stat
 119     dev <- st_dev p_stat
 120     ino <- st_ino p_stat
 121     return (ty,dev,ino)
 122
 123 fdType :: FD -> IO FDType
 124 fdType fd = do (ty,_,_) <- fdStat fd; return ty
 125
 126 statGetType :: Ptr CStat -> IO FDType
 127 statGetType p_stat = do
 128   c_mode <- st_mode p_stat :: IO CMode
 129   case () of
 130       _ | s_isdir c_mode        -> return Directory
 131         | s_isfifo c_mode || s_issock c_mode || s_ischr  c_mode
 132                                 -> return Stream
 133         | s_isreg c_mode        -> return RegularFile
 134          -- Q: map char devices to RawDevice too?
 135         | s_isblk c_mode        -> return RawDevice
 136         | otherwise             -> ioError ioe_unknownfiletype
 137
 138 ioe_unknownfiletype :: IOException
 139 #ifndef __NHC__
 140 ioe_unknownfiletype = IOError Nothing UnsupportedOperation "fdType"
 141                         "unknown file type"
 142 #  if __GLASGOW_HASKELL__
 143                         Nothing
 144 #  endif
 145                         Nothing
 146 #else
 147 ioe_unknownfiletype = UserError "fdType" "unknown file type"
 148 #endif
 149
 150 #if __GLASGOW_HASKELL__ && (defined(mingw32_HOST_OS) || defined(__MINGW32__))
 151 closeFd :: Bool -> CInt -> IO CInt
 152 closeFd isStream fd
 153   | isStream  = c_closesocket fd
 154   | otherwise = c_close fd
 155
 156 foreign import stdcall unsafe "HsBase.h closesocket"
 157    c_closesocket :: CInt -> IO CInt
 158 #endif
 159
 160 fdGetMode :: FD -> IO IOMode
 161 #if defined(mingw32_HOST_OS) || defined(__MINGW32__)
 162 fdGetMode _ = do
 163     -- We don't have a way of finding out which flags are set on FDs
 164     -- on Windows, so make a handle that thinks that anything goes.
 165     let flags = o_RDWR
 166 #else
 167 fdGetMode fd = do
 168     flags <- throwErrnoIfMinus1Retry "fdGetMode"
 169                 (c_fcntl_read fd const_f_getfl)
 170 #endif
 171     let
 172        wH  = (flags .&. o_WRONLY) /= 0
 173        aH  = (flags .&. o_APPEND) /= 0
 174        rwH = (flags .&. o_RDWR) /= 0
 175
 176        mode
 177          | wH && aH  = AppendMode
 178          | wH        = WriteMode
 179          | rwH       = ReadWriteMode
 180          | otherwise = ReadMode
 181
 182     return mode
 183
 184 -- ---------------------------------------------------------------------------
 185 -- Terminal-related stuff
 186
 187 fdIsTTY :: FD -> IO Bool
 188 fdIsTTY fd = c_isatty fd >>= return.toBool
 189
 190 #if defined(HTYPE_TCFLAG_T)
 191
 192 setEcho :: FD -> Bool -> IO ()
 193 setEcho fd on = do
 194   tcSetAttr fd $ \ p_tios -> do
 195     lflag <- c_lflag p_tios :: IO CTcflag
 196     let new_lflag
 197          | on        = lflag .|. fromIntegral const_echo
 198          | otherwise = lflag .&. complement (fromIntegral const_echo)
 199     poke_c_lflag p_tios (new_lflag :: CTcflag)
 200
 201 getEcho :: FD -> IO Bool
 202 getEcho fd = do
 203   tcSetAttr fd $ \ p_tios -> do
 204     lflag <- c_lflag p_tios :: IO CTcflag
 205     return ((lflag .&. fromIntegral const_echo) /= 0)
 206
 207 setCooked :: FD -> Bool -> IO ()
 208 setCooked fd cooked =
 209   tcSetAttr fd $ \ p_tios -> do
 210
 211     -- turn on/off ICANON
 212     lflag <- c_lflag p_tios :: IO CTcflag
 213     let new_lflag | cooked    = lflag .|. (fromIntegral const_icanon)
 214                   | otherwise = lflag .&. complement (fromIntegral const_icanon)
 215     poke_c_lflag p_tios (new_lflag :: CTcflag)
 216
 217     -- set VMIN & VTIME to 1/0 respectively
 218     when (not cooked) $ do
 219             c_cc <- ptr_c_cc p_tios
 220             let vmin  = (c_cc `plusPtr` (fromIntegral const_vmin))  :: Ptr Word8
 221                 vtime = (c_cc `plusPtr` (fromIntegral const_vtime)) :: Ptr Word8
 222             poke vmin  1
 223             poke vtime 0
 224
 225 tcSetAttr :: FD -> (Ptr CTermios -> IO a) -> IO a
 226 tcSetAttr fd fun = do
 227      allocaBytes sizeof_termios  $ \p_tios -> do
 228         throwErrnoIfMinus1Retry "tcSetAttr"
 229            (c_tcgetattr fd p_tios)
 230
 231 #ifdef __GLASGOW_HASKELL__
 232         -- Save a copy of termios, if this is a standard file descriptor.
 233         -- These terminal settings are restored in hs_exit().
 234         when (fd <= 2) $ do
 235           p <- get_saved_termios fd
 236           when (p == nullPtr) $ do
 237              saved_tios <- mallocBytes sizeof_termios
 238              copyBytes saved_tios p_tios sizeof_termios
 239              set_saved_termios fd saved_tios
 240 #endif
 241
 242         -- tcsetattr() when invoked by a background process causes the process
 243         -- to be sent SIGTTOU regardless of whether the process has TOSTOP set
 244         -- in its terminal flags (try it...).  This function provides a
 245         -- wrapper which temporarily blocks SIGTTOU around the call, making it
 246         -- transparent.
 247         allocaBytes sizeof_sigset_t $ \ p_sigset -> do
 248         allocaBytes sizeof_sigset_t $ \ p_old_sigset -> do
 249              c_sigemptyset p_sigset
 250              c_sigaddset   p_sigset const_sigttou
 251              c_sigprocmask const_sig_block p_sigset p_old_sigset
 252              r <- fun p_tios  -- do the business
 253              throwErrnoIfMinus1Retry_ "tcSetAttr" $
 254                  c_tcsetattr fd const_tcsanow p_tios
 255              c_sigprocmask const_sig_setmask p_old_sigset nullPtr
 256              return r
 257
 258 #ifdef __GLASGOW_HASKELL__
 259 foreign import ccall unsafe "HsBase.h __hscore_get_saved_termios"
 260    get_saved_termios :: CInt -> IO (Ptr CTermios)
 261
 262 foreign import ccall unsafe "HsBase.h __hscore_set_saved_termios"
 263    set_saved_termios :: CInt -> (Ptr CTermios) -> IO ()
 264 #endif
 265
 266 #else
 267
 268 -- 'raw' mode for Win32 means turn off 'line input' (=> buffering and
 269 -- character translation for the console.) The Win32 API for doing
 270 -- this is GetConsoleMode(), which also requires echoing to be disabled
 271 -- when turning off 'line input' processing. Notice that turning off
 272 -- 'line input' implies enter/return is reported as '\r' (and it won't
 273 -- report that character until another character is input..odd.) This
 274 -- latter feature doesn't sit too well with IO actions like IO.hGetLine..
 275 -- consider yourself warned.
 276 setCooked :: FD -> Bool -> IO ()
 277 setCooked fd cooked = do
 278   x <- set_console_buffering fd (if cooked then 1 else 0)
 279   if (x /= 0)
 280    then ioError (ioe_unk_error "setCooked" "failed to set buffering")
 281    else return ()
 282
 283 ioe_unk_error :: String -> String -> IOException
 284 ioe_unk_error loc msg
 285 #ifndef __NHC__
 286  = ioeSetErrorString (mkIOError OtherError loc Nothing Nothing) msg
 287 #else
 288  = UserError loc msg
 289 #endif
 290
 291 -- Note: echoing goes hand in hand with enabling 'line input' / raw-ness
 292 -- for Win32 consoles, hence setEcho ends up being the inverse of setCooked.
 293 setEcho :: FD -> Bool -> IO ()
 294 setEcho fd on = do
 295   x <- set_console_echo fd (if on then 1 else 0)
 296   if (x /= 0)
 297    then ioError (ioe_unk_error "setEcho" "failed to set echoing")
 298    else return ()
 299
 300 getEcho :: FD -> IO Bool
 301 getEcho fd = do
 302   r <- get_console_echo fd
 303   if (r == (-1))
 304    then ioError (ioe_unk_error "getEcho" "failed to get echoing")
 305    else return (r == 1)
 306
 307 foreign import ccall unsafe "consUtils.h set_console_buffering__"
 308    set_console_buffering :: CInt -> CInt -> IO CInt
 309
 310 foreign import ccall unsafe "consUtils.h set_console_echo__"
 311    set_console_echo :: CInt -> CInt -> IO CInt
 312
 313 foreign import ccall unsafe "consUtils.h get_console_echo__"
 314    get_console_echo :: CInt -> IO CInt
 315
 316 #endif
 317
 318 -- ---------------------------------------------------------------------------
 319 -- Turning on non-blocking for a file descriptor
 320
 321 setNonBlockingFD :: FD -> IO ()
 322 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 323 setNonBlockingFD fd = do
 324   flags <- throwErrnoIfMinus1Retry "setNonBlockingFD"
 325                  (c_fcntl_read fd const_f_getfl)
 326   -- An error when setting O_NONBLOCK isn't fatal: on some systems
 327   -- there are certain file handles on which this will fail (eg. /dev/null
 328   -- on FreeBSD) so we throw away the return code from fcntl_write.
 329   unless (testBit flags (fromIntegral o_NONBLOCK)) $ do
 330     c_fcntl_write fd const_f_setfl (fromIntegral (flags .|. o_NONBLOCK))
 331     return ()
 332 #else
 333
 334 -- bogus defns for win32
 335 setNonBlockingFD _ = return ()
 336
 337 #endif
 338
 339 -- -----------------------------------------------------------------------------
 340 -- Set close-on-exec for a file descriptor
 341
 342 setCloseOnExec :: FD -> IO ()
 343 setCloseOnExec fd = do
 344   throwErrnoIfMinus1 "setCloseOnExec" $
 345     c_fcntl_write fd const_f_setfd const_fd_cloexec
 346   return ()
 347
 348 -- -----------------------------------------------------------------------------
 349 -- foreign imports
 350
 351 foreign import ccall unsafe "HsBase.h access"
 352    c_access :: CString -> CInt -> IO CInt
 353
 354 foreign import ccall unsafe "HsBase.h chmod"
 355    c_chmod :: CString -> CMode -> IO CInt
 356
 357 foreign import ccall unsafe "HsBase.h close"
 358    c_close :: CInt -> IO CInt
 359
 360 foreign import ccall unsafe "HsBase.h closedir"
 361    c_closedir :: Ptr CDir -> IO CInt
 362
 363 foreign import ccall unsafe "HsBase.h creat"
 364    c_creat :: CString -> CMode -> IO CInt
 365
 366 foreign import ccall unsafe "HsBase.h dup"
 367    c_dup :: CInt -> IO CInt
 368
 369 foreign import ccall unsafe "HsBase.h dup2"
 370    c_dup2 :: CInt -> CInt -> IO CInt
 371
 372 foreign import ccall unsafe "HsBase.h __hscore_fstat"
 373    c_fstat :: CInt -> Ptr CStat -> IO CInt
 374
 375 foreign import ccall unsafe "HsBase.h isatty"
 376    c_isatty :: CInt -> IO CInt
 377
 378 #if defined(mingw32_HOST_OS) || defined(__MINGW32__)
 379 foreign import ccall unsafe "HsBase.h __hscore_lseek"
 380    c_lseek :: CInt -> Int64 -> CInt -> IO Int64
 381 #else
 382 foreign import ccall unsafe "HsBase.h __hscore_lseek"
 383    c_lseek :: CInt -> COff -> CInt -> IO COff
 384 #endif
 385
 386 foreign import ccall unsafe "HsBase.h __hscore_lstat"
 387    lstat :: CString -> Ptr CStat -> IO CInt
 388
 389 foreign import ccall unsafe "HsBase.h __hscore_open"
 390    c_open :: CString -> CInt -> CMode -> IO CInt
 391
 392 foreign import ccall unsafe "HsBase.h opendir"
 393    c_opendir :: CString  -> IO (Ptr CDir)
 394
 395 foreign import ccall unsafe "HsBase.h __hscore_mkdir"
 396    mkdir :: CString -> CInt -> IO CInt
 397
 398 foreign import ccall unsafe "HsBase.h read"
 399    c_read :: CInt -> Ptr CChar -> CSize -> IO CSsize
 400
 401 foreign import ccall unsafe "HsBase.h rewinddir"
 402    c_rewinddir :: Ptr CDir -> IO ()
 403
 404 foreign import ccall unsafe "HsBase.h __hscore_stat"
 405    c_stat :: CString -> Ptr CStat -> IO CInt
 406
 407 foreign import ccall unsafe "HsBase.h umask"
 408    c_umask :: CMode -> IO CMode
 409
 410 foreign import ccall unsafe "HsBase.h write"
 411    c_write :: CInt -> Ptr CChar -> CSize -> IO CSsize
 412
 413 foreign import ccall unsafe "HsBase.h __hscore_ftruncate"
 414    c_ftruncate :: CInt -> COff -> IO CInt
 415
 416 foreign import ccall unsafe "HsBase.h unlink"
 417    c_unlink :: CString -> IO CInt
 418
 419 foreign import ccall unsafe "HsBase.h getpid"
 420    c_getpid :: IO CPid
 421
 422 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 423 foreign import ccall unsafe "HsBase.h fcntl"
 424    c_fcntl_read  :: CInt -> CInt -> IO CInt
 425
 426 foreign import ccall unsafe "HsBase.h fcntl"
 427    c_fcntl_write :: CInt -> CInt -> CLong -> IO CInt
 428
 429 foreign import ccall unsafe "HsBase.h fcntl"
 430    c_fcntl_lock  :: CInt -> CInt -> Ptr CFLock -> IO CInt
 431
 432 foreign import ccall unsafe "HsBase.h fork"
 433    c_fork :: IO CPid
 434
 435 foreign import ccall unsafe "HsBase.h link"
 436    c_link :: CString -> CString -> IO CInt
 437
 438 foreign import ccall unsafe "HsBase.h mkfifo"
 439    c_mkfifo :: CString -> CMode -> IO CInt
 440
 441 foreign import ccall unsafe "HsBase.h pipe"
 442    c_pipe :: Ptr CInt -> IO CInt
 443
 444 foreign import ccall unsafe "HsBase.h __hscore_sigemptyset"
 445    c_sigemptyset :: Ptr CSigset -> IO CInt
 446
 447 foreign import ccall unsafe "HsBase.h __hscore_sigaddset"
 448    c_sigaddset :: Ptr CSigset -> CInt -> IO CInt
 449
 450 foreign import ccall unsafe "HsBase.h sigprocmask"
 451    c_sigprocmask :: CInt -> Ptr CSigset -> Ptr CSigset -> IO CInt
 452
 453 foreign import ccall unsafe "HsBase.h tcgetattr"
 454    c_tcgetattr :: CInt -> Ptr CTermios -> IO CInt
 455
 456 foreign import ccall unsafe "HsBase.h tcsetattr"
 457    c_tcsetattr :: CInt -> CInt -> Ptr CTermios -> IO CInt
 458
 459 foreign import ccall unsafe "HsBase.h utime"
 460    c_utime :: CString -> Ptr CUtimbuf -> IO CInt
 461
 462 foreign import ccall unsafe "HsBase.h waitpid"
 463    c_waitpid :: CPid -> Ptr CInt -> CInt -> IO CPid
 464 #endif
 465
 466 -- traversing directories
 467 foreign import ccall unsafe "dirUtils.h __hscore_readdir"
 468   readdir  :: Ptr CDir -> Ptr (Ptr CDirent) -> IO CInt
 469
 470 foreign import ccall unsafe "HsBase.h __hscore_free_dirent"
 471   freeDirEnt  :: Ptr CDirent -> IO ()
 472
 473 foreign import ccall unsafe "HsBase.h __hscore_end_of_dir"
 474   end_of_dir :: CInt
 475
 476 foreign import ccall unsafe "HsBase.h __hscore_d_name"
 477   d_name :: Ptr CDirent -> IO CString
 478
 479 -- POSIX flags only:
 480 foreign import ccall unsafe "HsBase.h __hscore_o_rdonly" o_RDONLY :: CInt
 481 foreign import ccall unsafe "HsBase.h __hscore_o_wronly" o_WRONLY :: CInt
 482 foreign import ccall unsafe "HsBase.h __hscore_o_rdwr"   o_RDWR   :: CInt
 483 foreign import ccall unsafe "HsBase.h __hscore_o_append" o_APPEND :: CInt
 484 foreign import ccall unsafe "HsBase.h __hscore_o_creat"  o_CREAT  :: CInt
 485 foreign import ccall unsafe "HsBase.h __hscore_o_excl"   o_EXCL   :: CInt
 486 foreign import ccall unsafe "HsBase.h __hscore_o_trunc"  o_TRUNC  :: CInt
 487
 488 -- non-POSIX flags.
 489 foreign import ccall unsafe "HsBase.h __hscore_o_noctty"   o_NOCTTY   :: CInt
 490 foreign import ccall unsafe "HsBase.h __hscore_o_nonblock" o_NONBLOCK :: CInt
 491 foreign import ccall unsafe "HsBase.h __hscore_o_binary"   o_BINARY   :: CInt
 492
 493 foreign import ccall unsafe "HsBase.h __hscore_s_isreg"  c_s_isreg  :: CMode -> CInt
 494 foreign import ccall unsafe "HsBase.h __hscore_s_ischr"  c_s_ischr  :: CMode -> CInt
 495 foreign import ccall unsafe "HsBase.h __hscore_s_isblk"  c_s_isblk  :: CMode -> CInt
 496 foreign import ccall unsafe "HsBase.h __hscore_s_isdir"  c_s_isdir  :: CMode -> CInt
 497 foreign import ccall unsafe "HsBase.h __hscore_s_isfifo" c_s_isfifo :: CMode -> CInt
 498
 499 s_isreg  :: CMode -> Bool
 500 s_isreg cm = c_s_isreg cm /= 0
 501 s_ischr  :: CMode -> Bool
 502 s_ischr cm = c_s_ischr cm /= 0
 503 s_isblk  :: CMode -> Bool
 504 s_isblk cm = c_s_isblk cm /= 0
 505 s_isdir  :: CMode -> Bool
 506 s_isdir cm = c_s_isdir cm /= 0
 507 s_isfifo :: CMode -> Bool
 508 s_isfifo cm = c_s_isfifo cm /= 0
 509
 510 foreign import ccall unsafe "HsBase.h __hscore_sizeof_stat" sizeof_stat :: Int
 511 foreign import ccall unsafe "HsBase.h __hscore_st_mtime" st_mtime :: Ptr CStat -> IO CTime
 512 #ifdef mingw32_HOST_OS
 513 foreign import ccall unsafe "HsBase.h __hscore_st_size" st_size :: Ptr CStat -> IO Int64
 514 #else
 515 foreign import ccall unsafe "HsBase.h __hscore_st_size" st_size :: Ptr CStat -> IO COff
 516 #endif
 517 foreign import ccall unsafe "HsBase.h __hscore_st_mode" st_mode :: Ptr CStat -> IO CMode
 518 foreign import ccall unsafe "HsBase.h __hscore_st_dev" st_dev :: Ptr CStat -> IO CDev
 519 foreign import ccall unsafe "HsBase.h __hscore_st_ino" st_ino :: Ptr CStat -> IO CIno
 520
 521 foreign import ccall unsafe "HsBase.h __hscore_echo"         const_echo :: CInt
 522 foreign import ccall unsafe "HsBase.h __hscore_tcsanow"      const_tcsanow :: CInt
 523 foreign import ccall unsafe "HsBase.h __hscore_icanon"       const_icanon :: CInt
 524 foreign import ccall unsafe "HsBase.h __hscore_vmin"         const_vmin   :: CInt
 525 foreign import ccall unsafe "HsBase.h __hscore_vtime"        const_vtime  :: CInt
 526 foreign import ccall unsafe "HsBase.h __hscore_sigttou"      const_sigttou :: CInt
 527 foreign import ccall unsafe "HsBase.h __hscore_sig_block"    const_sig_block :: CInt
 528 foreign import ccall unsafe "HsBase.h __hscore_sig_setmask"  const_sig_setmask :: CInt
 529 foreign import ccall unsafe "HsBase.h __hscore_f_getfl"      const_f_getfl :: CInt
 530 foreign import ccall unsafe "HsBase.h __hscore_f_setfl"      const_f_setfl :: CInt
 531 foreign import ccall unsafe "HsBase.h __hscore_f_setfd"      const_f_setfd :: CInt
 532 foreign import ccall unsafe "HsBase.h __hscore_fd_cloexec"   const_fd_cloexec :: CLong
 533
 534 #if defined(HTYPE_TCFLAG_T)
 535 foreign import ccall unsafe "HsBase.h __hscore_sizeof_termios"  sizeof_termios :: Int
 536 foreign import ccall unsafe "HsBase.h __hscore_sizeof_sigset_t" sizeof_sigset_t :: Int
 537
 538 foreign import ccall unsafe "HsBase.h __hscore_lflag" c_lflag :: Ptr CTermios -> IO CTcflag
 539 foreign import ccall unsafe "HsBase.h __hscore_poke_lflag" poke_c_lflag :: Ptr CTermios -> CTcflag -> IO ()
 540 foreign import ccall unsafe "HsBase.h __hscore_ptr_c_cc" ptr_c_cc  :: Ptr CTermios -> IO (Ptr Word8)
 541 #endif
 542
 543 s_issock :: CMode -> Bool
 544 #if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
 545 s_issock cmode = c_s_issock cmode /= 0
 546 foreign import ccall unsafe "HsBase.h __hscore_s_issock" c_s_issock :: CMode -> CInt
 547 #else
 548 s_issock _ = False
 549 #endif