1 {-# OPTIONS -fno-implicit-prelude -#include "PrelIOUtils.h" #-}
3 -- ---------------------------------------------------------------------------
5 -- POSIX support layer for the standard libraries
7 -- Non-posix compliant in order to support the following features:
8 -- * S_ISSOCK (no sockets in POSIX)
10 module PrelPosix where
12 -- See above comment for non-Posixness reasons.
13 -- #include "PosixSource.h"
29 import PrelMarshalAlloc
30 import PrelMarshalUtils
36 -- ---------------------------------------------------------------------------
42 type CDev = #type dev_t
43 type CIno = #type ino_t
44 type CMode = #type mode_t
45 type COff = #type off_t
46 type CPid = #type pid_t
48 #ifdef mingw32_TARGET_OS
49 type CSsize = #type size_t
51 type CGid = #type gid_t
52 type CNlink = #type nlink_t
53 type CSsize = #type ssize_t
54 type CUid = #type uid_t
56 type CSpeed = #type speed_t
57 type CTcflag = #type tcflag_t
60 -- ---------------------------------------------------------------------------
61 -- stat()-related stuff
65 fdFileSize :: Int -> IO Integer
67 allocaBytes (#const sizeof(struct stat)) $ \ p_stat -> do
68 throwErrnoIfMinus1Retry "fileSize" $
69 c_fstat (fromIntegral fd) p_stat
70 c_mode <- (#peek struct stat, st_mode) p_stat :: IO CMode
71 if not (s_isreg c_mode)
74 c_size <- (#peek struct stat, st_size) p_stat :: IO COff
75 return (fromIntegral c_size)
77 data FDType = Directory | Stream | RegularFile
80 -- NOTE: On Win32 platforms, this will only work with file descriptors
81 -- referring to file handles. i.e., it'll fail for socket FDs.
82 fdType :: Int -> IO FDType
84 allocaBytes (#const sizeof(struct stat)) $ \ p_stat -> do
85 throwErrnoIfMinus1Retry "fdType" $
86 c_fstat (fromIntegral fd) p_stat
87 c_mode <- (#peek struct stat, st_mode) p_stat :: IO CMode
89 _ | s_isdir c_mode -> return Directory
90 | s_isfifo c_mode -> return Stream
91 | s_issock c_mode -> return Stream
92 | s_ischr c_mode -> return Stream
93 | s_isreg c_mode -> return RegularFile
94 | s_isblk c_mode -> return RegularFile
95 | otherwise -> ioException ioe_unknownfiletype
96 -- we consider character devices to be streams (eg. ttys),
97 -- whereas block devices are more like regular files because they
100 ioe_unknownfiletype = IOError Nothing UnsupportedOperation "fdType"
101 "unknown file type" Nothing
103 foreign import "s_isreg_PrelPosix_wrap" unsafe s_isreg :: CMode -> Bool
104 foreign import "s_isdir_PrelPosix_wrap" unsafe s_isdir :: CMode -> Bool
105 foreign import "s_isfifo_PrelPosix_wrap" unsafe s_isfifo :: CMode -> Bool
106 foreign import "s_ischr_PrelPosix_wrap" unsafe s_ischr :: CMode -> Bool
107 foreign import "s_isblk_PrelPosix_wrap" unsafe s_isblk :: CMode -> Bool
109 #ifndef mingw32_TARGET_OS
110 foreign import "s_issock_PrelPosix_wrap" unsafe s_issock :: CMode -> Bool
112 s_issock :: CMode -> Bool
113 s_issock cmode = False
116 -- It isn't clear whether ftruncate is POSIX or not (I've read several
117 -- manpages and they seem to conflict), so we truncate using open/2.
118 fileTruncate :: FilePath -> IO ()
119 fileTruncate file = do
120 let flags = o_WRONLY .|. o_TRUNC
121 withCString file $ \file_cstr -> do
122 fd <- fromIntegral `liftM`
123 throwErrnoIfMinus1Retry "fileTruncate"
124 (c_open file_cstr (fromIntegral flags) 0o666)
128 -- ---------------------------------------------------------------------------
129 -- Terminal-related stuff
131 fdIsTTY :: Int -> IO Bool
132 fdIsTTY fd = c_isatty (fromIntegral fd) >>= return.toBool
134 #ifndef mingw32_TARGET_OS
138 setEcho :: Int -> Bool -> IO ()
140 allocaBytes (#const sizeof(struct termios)) $ \p_tios -> do
141 throwErrnoIfMinus1Retry "setEcho"
142 (c_tcgetattr (fromIntegral fd) p_tios)
143 c_lflag <- (#peek struct termios, c_lflag) p_tios :: IO CTcflag
144 let new_c_lflag | on = c_lflag .|. (#const ECHO)
145 | otherwise = c_lflag .&. complement (#const ECHO)
146 (#poke struct termios, c_lflag) p_tios (new_c_lflag :: CTcflag)
147 tcSetAttr fd (#const TCSANOW) p_tios
149 getEcho :: Int -> IO Bool
151 allocaBytes (#const sizeof(struct termios)) $ \p_tios -> do
152 throwErrnoIfMinus1Retry "setEcho"
153 (c_tcgetattr (fromIntegral fd) p_tios)
154 c_lflag <- (#peek struct termios, c_lflag) p_tios :: IO CTcflag
155 return ((c_lflag .&. (#const ECHO)) /= 0)
157 setCooked :: Int -> Bool -> IO ()
158 setCooked fd cooked =
159 allocaBytes (#const sizeof(struct termios)) $ \p_tios -> do
160 throwErrnoIfMinus1Retry "setCooked"
161 (c_tcgetattr (fromIntegral fd) p_tios)
163 -- turn on/off ICANON
164 c_lflag <- (#peek struct termios, c_lflag) p_tios :: IO CTcflag
165 let new_c_lflag | cooked = c_lflag .|. (#const ICANON)
166 | otherwise = c_lflag .&. complement (#const ICANON)
167 (#poke struct termios, c_lflag) p_tios (new_c_lflag :: CTcflag)
169 -- set VMIN & VTIME to 1/0 respectively
171 let c_cc = (#ptr struct termios, c_cc) p_tios
172 vmin = c_cc `plusPtr` (#const VMIN) :: Ptr Word8
173 vtime = c_cc `plusPtr` (#const VTIME) :: Ptr Word8
177 tcSetAttr fd (#const TCSANOW) p_tios
179 -- tcsetattr() when invoked by a background process causes the process
180 -- to be sent SIGTTOU regardless of whether the process has TOSTOP set
181 -- in its terminal flags (try it...). This function provides a
182 -- wrapper which temporarily blocks SIGTTOU around the call, making it
185 tcSetAttr :: FD -> CInt -> Ptr Termios -> IO ()
186 tcSetAttr fd options p_tios = do
187 allocaBytes (#const sizeof(sigset_t)) $ \ p_sigset -> do
188 allocaBytes (#const sizeof(sigset_t)) $ \ p_old_sigset -> do
189 c_sigemptyset p_sigset
190 c_sigaddset p_sigset (#const SIGTTOU)
191 c_sigprocmask (#const SIG_BLOCK) p_sigset p_old_sigset
192 throwErrnoIfMinus1Retry_ "tcSetAttr" $
193 c_tcsetattr (fromIntegral fd) options p_tios
194 c_sigprocmask (#const SIG_SETMASK) p_old_sigset nullPtr
198 -- bogus defns for win32
199 setCooked :: Int -> Bool -> IO ()
200 setCooked fd cooked = return ()
202 setEcho :: Int -> Bool -> IO ()
203 setEcho fd on = return ()
205 getEcho :: Int -> IO Bool
206 getEcho fd = return False
210 -- ---------------------------------------------------------------------------
211 -- Turning on non-blocking for a file descriptor
213 #ifndef mingw32_TARGET_OS
215 setNonBlockingFD fd = do
216 flags <- throwErrnoIfMinus1Retry "setNonBlockingFD"
217 (fcntl_read (fromIntegral fd) (#const F_GETFL))
218 -- An error when setting O_NONBLOCK isn't fatal: on some systems
219 -- there are certain file handles on which this will fail (eg. /dev/null
220 -- on FreeBSD) so we throw away the return code from fcntl_write.
221 fcntl_write (fromIntegral fd)
222 (#const F_SETFL) (flags .|. #const O_NONBLOCK)
225 -- bogus defns for win32
226 setNonBlockingFD fd = return ()
230 -- -----------------------------------------------------------------------------
233 foreign import "stat" unsafe
234 c_stat :: CString -> Ptr CStat -> IO CInt
236 foreign import "fstat" unsafe
237 c_fstat :: CInt -> Ptr CStat -> IO CInt
240 foreign import "lstat" unsafe
241 c_lstat :: CString -> Ptr CStat -> IO CInt
244 foreign import "open" unsafe
245 c_open :: CString -> CInt -> CMode -> IO CInt
248 o_RDONLY = (#const O_RDONLY) :: CInt
249 o_WRONLY = (#const O_WRONLY) :: CInt
250 o_RDWR = (#const O_RDWR) :: CInt
251 o_APPEND = (#const O_APPEND) :: CInt
252 o_CREAT = (#const O_CREAT) :: CInt
253 o_EXCL = (#const O_EXCL) :: CInt
254 o_TRUNC = (#const O_TRUNC) :: CInt
256 #ifdef mingw32_TARGET_OS
258 o_NONBLOCK = 0 :: CInt
260 o_NOCTTY = (#const O_NOCTTY) :: CInt
261 o_NONBLOCK = (#const O_NONBLOCK) :: CInt
265 o_BINARY = (#const O_BINARY) :: CInt
268 foreign import "isatty" unsafe
269 c_isatty :: CInt -> IO CInt
271 foreign import "close" unsafe
272 c_close :: CInt -> IO CInt
274 #ifdef mingw32_TARGET_OS
275 closeFd :: Bool -> CInt -> IO CInt
277 | isStream = c_closesocket fd
278 | otherwise = c_close fd
280 foreign import "closesocket" unsafe
281 c_closesocket :: CInt -> IO CInt
284 foreign import "lseek" unsafe
285 c_lseek :: CInt -> COff -> CInt -> IO COff
287 #ifndef mingw32_TARGET_OS
288 foreign import "fcntl" unsafe
289 fcntl_read :: CInt -> CInt -> IO CInt
291 foreign import "fcntl" unsafe
292 fcntl_write :: CInt -> CInt -> CInt -> IO CInt
294 foreign import "fork" unsafe
297 foreign import "sigemptyset_PrelPosix_wrap" unsafe
298 c_sigemptyset :: Ptr CSigset -> IO ()
300 foreign import "sigaddset" unsafe
301 c_sigaddset :: Ptr CSigset -> CInt -> IO ()
303 foreign import "sigprocmask" unsafe
304 c_sigprocmask :: CInt -> Ptr CSigset -> Ptr CSigset -> IO ()
306 foreign import "tcgetattr" unsafe
307 c_tcgetattr :: CInt -> Ptr Termios -> IO CInt
309 foreign import "tcsetattr" unsafe
310 c_tcsetattr :: CInt -> CInt -> Ptr Termios -> IO CInt
312 foreign import "unlink" unsafe
313 c_unlink :: CString -> IO CInt
315 foreign import "waitpid" unsafe
316 c_waitpid :: CPid -> Ptr CInt -> CInt -> IO CPid