1 {-# OPTIONS -fno-implicit-prelude -#include "HsBase.h" #-}
2 -----------------------------------------------------------------------------
4 -- Module : Foreign.C.Error
5 -- Copyright : (c) The FFI task force 2001
6 -- License : BSD-style (see the file libraries/base/LICENSE)
8 -- Maintainer : ffi@haskell.org
9 -- Stability : provisional
10 -- Portability : portable
12 -- C-specific Marshalling support: Handling of C \"errno\" error codes.
14 -----------------------------------------------------------------------------
16 module Foreign.C.Error (
18 -- * Haskell representations of @errno@ values
20 Errno(..), -- instance: Eq
22 -- ** Common @errno@ symbols
23 -- | Different operating systems and\/or C libraries often support
24 -- different values of @errno@. This module defines the common values,
25 -- but due to the open definition of 'Errno' users may add definitions
26 -- which are not predefined.
27 eOK, e2BIG, eACCES, eADDRINUSE, eADDRNOTAVAIL, eADV, eAFNOSUPPORT, eAGAIN,
28 eALREADY, eBADF, eBADMSG, eBADRPC, eBUSY, eCHILD, eCOMM, eCONNABORTED,
29 eCONNREFUSED, eCONNRESET, eDEADLK, eDESTADDRREQ, eDIRTY, eDOM, eDQUOT,
30 eEXIST, eFAULT, eFBIG, eFTYPE, eHOSTDOWN, eHOSTUNREACH, eIDRM, eILSEQ,
31 eINPROGRESS, eINTR, eINVAL, eIO, eISCONN, eISDIR, eLOOP, eMFILE, eMLINK,
32 eMSGSIZE, eMULTIHOP, eNAMETOOLONG, eNETDOWN, eNETRESET, eNETUNREACH,
33 eNFILE, eNOBUFS, eNODATA, eNODEV, eNOENT, eNOEXEC, eNOLCK, eNOLINK,
34 eNOMEM, eNOMSG, eNONET, eNOPROTOOPT, eNOSPC, eNOSR, eNOSTR, eNOSYS,
35 eNOTBLK, eNOTCONN, eNOTDIR, eNOTEMPTY, eNOTSOCK, eNOTTY, eNXIO,
36 eOPNOTSUPP, ePERM, ePFNOSUPPORT, ePIPE, ePROCLIM, ePROCUNAVAIL,
37 ePROGMISMATCH, ePROGUNAVAIL, ePROTO, ePROTONOSUPPORT, ePROTOTYPE,
38 eRANGE, eREMCHG, eREMOTE, eROFS, eRPCMISMATCH, eRREMOTE, eSHUTDOWN,
39 eSOCKTNOSUPPORT, eSPIPE, eSRCH, eSRMNT, eSTALE, eTIME, eTIMEDOUT,
40 eTOOMANYREFS, eTXTBSY, eUSERS, eWOULDBLOCK, eXDEV,
42 -- ** 'Errno' functions
44 isValidErrno, -- :: Errno -> Bool
46 -- access to the current thread's "errno" value
48 getErrno, -- :: IO Errno
49 resetErrno, -- :: IO ()
51 -- conversion of an "errno" value into IO error
53 errnoToIOError, -- :: String -- location
55 -- -> Maybe Handle -- handle
56 -- -> Maybe String -- filename
59 -- throw current "errno" value
61 throwErrno, -- :: String -> IO a
63 -- ** Guards for IO operations that may fail
65 throwErrnoIf, -- :: (a -> Bool) -> String -> IO a -> IO a
66 throwErrnoIf_, -- :: (a -> Bool) -> String -> IO a -> IO ()
67 throwErrnoIfRetry, -- :: (a -> Bool) -> String -> IO a -> IO a
68 throwErrnoIfRetry_, -- :: (a -> Bool) -> String -> IO a -> IO ()
69 throwErrnoIfMinus1, -- :: Num a
70 -- => String -> IO a -> IO a
71 throwErrnoIfMinus1_, -- :: Num a
72 -- => String -> IO a -> IO ()
73 throwErrnoIfMinus1Retry,
75 -- => String -> IO a -> IO a
76 throwErrnoIfMinus1Retry_,
78 -- => String -> IO a -> IO ()
79 throwErrnoIfNull, -- :: String -> IO (Ptr a) -> IO (Ptr a)
80 throwErrnoIfNullRetry,-- :: String -> IO (Ptr a) -> IO (Ptr a)
82 throwErrnoIfRetryMayBlock,
83 throwErrnoIfRetryMayBlock_,
84 throwErrnoIfMinus1RetryMayBlock,
85 throwErrnoIfMinus1RetryMayBlock_,
86 throwErrnoIfNullRetryMayBlock
90 -- this is were we get the CONST_XXX definitions from that configure
94 #include "HsBaseConfig.h"
97 -- system dependent imports
98 -- ------------------------
100 -- GHC allows us to get at the guts inside IO errors/exceptions
102 #if __GLASGOW_HASKELL__
103 import GHC.IOBase (IOException(..), IOErrorType(..))
104 #endif /* __GLASGOW_HASKELL__ */
110 import Foreign.Storable
112 import Foreign.C.Types
113 import Foreign.C.String
114 import Foreign.Marshal.Error ( void )
117 #if __GLASGOW_HASKELL__
122 import System.IO ( IOError, Handle, ioError )
123 import System.IO.Unsafe ( unsafePerformIO )
127 {-# CFILES cbits/PrelIOUtils.c #-}
134 -- | Haskell representation for @errno@ values.
135 -- The implementation is deliberately exposed, to allow users to add
136 -- their own definitions of 'Errno' values.
138 newtype Errno = Errno CInt
140 instance Eq Errno where
141 errno1@(Errno no1) == errno2@(Errno no2)
142 | isValidErrno errno1 && isValidErrno errno2 = no1 == no2
145 -- common "errno" symbols
147 eOK, e2BIG, eACCES, eADDRINUSE, eADDRNOTAVAIL, eADV, eAFNOSUPPORT, eAGAIN,
148 eALREADY, eBADF, eBADMSG, eBADRPC, eBUSY, eCHILD, eCOMM, eCONNABORTED,
149 eCONNREFUSED, eCONNRESET, eDEADLK, eDESTADDRREQ, eDIRTY, eDOM, eDQUOT,
150 eEXIST, eFAULT, eFBIG, eFTYPE, eHOSTDOWN, eHOSTUNREACH, eIDRM, eILSEQ,
151 eINPROGRESS, eINTR, eINVAL, eIO, eISCONN, eISDIR, eLOOP, eMFILE, eMLINK,
152 eMSGSIZE, eMULTIHOP, eNAMETOOLONG, eNETDOWN, eNETRESET, eNETUNREACH,
153 eNFILE, eNOBUFS, eNODATA, eNODEV, eNOENT, eNOEXEC, eNOLCK, eNOLINK,
154 eNOMEM, eNOMSG, eNONET, eNOPROTOOPT, eNOSPC, eNOSR, eNOSTR, eNOSYS,
155 eNOTBLK, eNOTCONN, eNOTDIR, eNOTEMPTY, eNOTSOCK, eNOTTY, eNXIO,
156 eOPNOTSUPP, ePERM, ePFNOSUPPORT, ePIPE, ePROCLIM, ePROCUNAVAIL,
157 ePROGMISMATCH, ePROGUNAVAIL, ePROTO, ePROTONOSUPPORT, ePROTOTYPE,
158 eRANGE, eREMCHG, eREMOTE, eROFS, eRPCMISMATCH, eRREMOTE, eSHUTDOWN,
159 eSOCKTNOSUPPORT, eSPIPE, eSRCH, eSRMNT, eSTALE, eTIME, eTIMEDOUT,
160 eTOOMANYREFS, eTXTBSY, eUSERS, eWOULDBLOCK, eXDEV :: Errno
162 -- the cCONST_XXX identifiers are cpp symbols whose value is computed by
169 e2BIG = Errno (CONST_E2BIG)
170 eACCES = Errno (CONST_EACCES)
171 eADDRINUSE = Errno (CONST_EADDRINUSE)
172 eADDRNOTAVAIL = Errno (CONST_EADDRNOTAVAIL)
173 eADV = Errno (CONST_EADV)
174 eAFNOSUPPORT = Errno (CONST_EAFNOSUPPORT)
175 eAGAIN = Errno (CONST_EAGAIN)
176 eALREADY = Errno (CONST_EALREADY)
177 eBADF = Errno (CONST_EBADF)
178 eBADMSG = Errno (CONST_EBADMSG)
179 eBADRPC = Errno (CONST_EBADRPC)
180 eBUSY = Errno (CONST_EBUSY)
181 eCHILD = Errno (CONST_ECHILD)
182 eCOMM = Errno (CONST_ECOMM)
183 eCONNABORTED = Errno (CONST_ECONNABORTED)
184 eCONNREFUSED = Errno (CONST_ECONNREFUSED)
185 eCONNRESET = Errno (CONST_ECONNRESET)
186 eDEADLK = Errno (CONST_EDEADLK)
187 eDESTADDRREQ = Errno (CONST_EDESTADDRREQ)
188 eDIRTY = Errno (CONST_EDIRTY)
189 eDOM = Errno (CONST_EDOM)
190 eDQUOT = Errno (CONST_EDQUOT)
191 eEXIST = Errno (CONST_EEXIST)
192 eFAULT = Errno (CONST_EFAULT)
193 eFBIG = Errno (CONST_EFBIG)
194 eFTYPE = Errno (CONST_EFTYPE)
195 eHOSTDOWN = Errno (CONST_EHOSTDOWN)
196 eHOSTUNREACH = Errno (CONST_EHOSTUNREACH)
197 eIDRM = Errno (CONST_EIDRM)
198 eILSEQ = Errno (CONST_EILSEQ)
199 eINPROGRESS = Errno (CONST_EINPROGRESS)
200 eINTR = Errno (CONST_EINTR)
201 eINVAL = Errno (CONST_EINVAL)
202 eIO = Errno (CONST_EIO)
203 eISCONN = Errno (CONST_EISCONN)
204 eISDIR = Errno (CONST_EISDIR)
205 eLOOP = Errno (CONST_ELOOP)
206 eMFILE = Errno (CONST_EMFILE)
207 eMLINK = Errno (CONST_EMLINK)
208 eMSGSIZE = Errno (CONST_EMSGSIZE)
209 eMULTIHOP = Errno (CONST_EMULTIHOP)
210 eNAMETOOLONG = Errno (CONST_ENAMETOOLONG)
211 eNETDOWN = Errno (CONST_ENETDOWN)
212 eNETRESET = Errno (CONST_ENETRESET)
213 eNETUNREACH = Errno (CONST_ENETUNREACH)
214 eNFILE = Errno (CONST_ENFILE)
215 eNOBUFS = Errno (CONST_ENOBUFS)
216 eNODATA = Errno (CONST_ENODATA)
217 eNODEV = Errno (CONST_ENODEV)
218 eNOENT = Errno (CONST_ENOENT)
219 eNOEXEC = Errno (CONST_ENOEXEC)
220 eNOLCK = Errno (CONST_ENOLCK)
221 eNOLINK = Errno (CONST_ENOLINK)
222 eNOMEM = Errno (CONST_ENOMEM)
223 eNOMSG = Errno (CONST_ENOMSG)
224 eNONET = Errno (CONST_ENONET)
225 eNOPROTOOPT = Errno (CONST_ENOPROTOOPT)
226 eNOSPC = Errno (CONST_ENOSPC)
227 eNOSR = Errno (CONST_ENOSR)
228 eNOSTR = Errno (CONST_ENOSTR)
229 eNOSYS = Errno (CONST_ENOSYS)
230 eNOTBLK = Errno (CONST_ENOTBLK)
231 eNOTCONN = Errno (CONST_ENOTCONN)
232 eNOTDIR = Errno (CONST_ENOTDIR)
233 eNOTEMPTY = Errno (CONST_ENOTEMPTY)
234 eNOTSOCK = Errno (CONST_ENOTSOCK)
235 eNOTTY = Errno (CONST_ENOTTY)
236 eNXIO = Errno (CONST_ENXIO)
237 eOPNOTSUPP = Errno (CONST_EOPNOTSUPP)
238 ePERM = Errno (CONST_EPERM)
239 ePFNOSUPPORT = Errno (CONST_EPFNOSUPPORT)
240 ePIPE = Errno (CONST_EPIPE)
241 ePROCLIM = Errno (CONST_EPROCLIM)
242 ePROCUNAVAIL = Errno (CONST_EPROCUNAVAIL)
243 ePROGMISMATCH = Errno (CONST_EPROGMISMATCH)
244 ePROGUNAVAIL = Errno (CONST_EPROGUNAVAIL)
245 ePROTO = Errno (CONST_EPROTO)
246 ePROTONOSUPPORT = Errno (CONST_EPROTONOSUPPORT)
247 ePROTOTYPE = Errno (CONST_EPROTOTYPE)
248 eRANGE = Errno (CONST_ERANGE)
249 eREMCHG = Errno (CONST_EREMCHG)
250 eREMOTE = Errno (CONST_EREMOTE)
251 eROFS = Errno (CONST_EROFS)
252 eRPCMISMATCH = Errno (CONST_ERPCMISMATCH)
253 eRREMOTE = Errno (CONST_ERREMOTE)
254 eSHUTDOWN = Errno (CONST_ESHUTDOWN)
255 eSOCKTNOSUPPORT = Errno (CONST_ESOCKTNOSUPPORT)
256 eSPIPE = Errno (CONST_ESPIPE)
257 eSRCH = Errno (CONST_ESRCH)
258 eSRMNT = Errno (CONST_ESRMNT)
259 eSTALE = Errno (CONST_ESTALE)
260 eTIME = Errno (CONST_ETIME)
261 eTIMEDOUT = Errno (CONST_ETIMEDOUT)
262 eTOOMANYREFS = Errno (CONST_ETOOMANYREFS)
263 eTXTBSY = Errno (CONST_ETXTBSY)
264 eUSERS = Errno (CONST_EUSERS)
265 eWOULDBLOCK = Errno (CONST_EWOULDBLOCK)
266 eXDEV = Errno (CONST_EXDEV)
269 -- | Yield 'True' if the given 'Errno' value is valid on the system.
270 -- This implies that the 'Eq' instance of 'Errno' is also system dependent
271 -- as it is only defined for valid values of 'Errno'.
273 isValidErrno :: Errno -> Bool
275 -- the configure script sets all invalid "errno"s to -1
277 isValidErrno (Errno errno) = errno /= -1
280 -- access to the current thread's "errno" value
281 -- --------------------------------------------
283 -- | Get the current value of @errno@ in the current thread.
287 -- We must call a C function to get the value of errno in general. On
288 -- threaded systems, errno is hidden behind a C macro so that each OS
289 -- thread gets its own copy.
291 getErrno = do e <- peek _errno; return (Errno e)
292 foreign import ccall unsafe "errno.h &errno" _errno :: Ptr CInt
294 getErrno = do e <- get_errno; return (Errno e)
295 foreign import ccall unsafe "HsBase.h __hscore_get_errno" get_errno :: IO CInt
298 -- | Reset the current thread\'s @errno@ value to 'eOK'.
302 -- Again, setting errno has to be done via a C function.
304 resetErrno = poke _errno 0
306 resetErrno = set_errno 0
307 foreign import ccall unsafe "HsBase.h __hscore_set_errno" set_errno :: CInt -> IO ()
310 -- throw current "errno" value
311 -- ---------------------------
313 -- | Throw an 'IOError' corresponding to the current value of 'getErrno'.
315 throwErrno :: String -- ^ textual description of the error location
320 ioError (errnoToIOError loc errno Nothing Nothing)
323 -- guards for IO operations that may fail
324 -- --------------------------------------
326 -- | Throw an 'IOError' corresponding to the current value of 'getErrno'
327 -- if the result value of the 'IO' action meets the given predicate.
329 throwErrnoIf :: (a -> Bool) -- ^ predicate to apply to the result value
330 -- of the 'IO' operation
331 -> String -- ^ textual description of the location
332 -> IO a -- ^ the 'IO' operation to be executed
334 throwErrnoIf pred loc f =
337 if pred res then throwErrno loc else return res
339 -- | as 'throwErrnoIf', but discards the result of the 'IO' action after
342 throwErrnoIf_ :: (a -> Bool) -> String -> IO a -> IO ()
343 throwErrnoIf_ pred loc f = void $ throwErrnoIf pred loc f
345 -- | as 'throwErrnoIf', but retry the 'IO' action when it yields the
346 -- error code 'eINTR' - this amounts to the standard retry loop for
347 -- interrupted POSIX system calls.
349 throwErrnoIfRetry :: (a -> Bool) -> String -> IO a -> IO a
350 throwErrnoIfRetry pred loc f =
357 then throwErrnoIfRetry pred loc f
361 -- | as 'throwErrnoIfRetry', but checks for operations that would block and
362 -- executes an alternative action before retrying in that case.
364 throwErrnoIfRetryMayBlock
365 :: (a -> Bool) -- ^ predicate to apply to the result value
366 -- of the 'IO' operation
367 -> String -- ^ textual description of the location
368 -> IO a -- ^ the 'IO' operation to be executed
369 -> IO b -- ^ action to execute before retrying if
370 -- an immediate retry would block
372 throwErrnoIfRetryMayBlock pred loc f on_block =
379 then throwErrnoIfRetryMayBlock pred loc f on_block
380 else if err == eWOULDBLOCK || err == eAGAIN
381 then do on_block; throwErrnoIfRetryMayBlock pred loc f on_block
385 -- | as 'throwErrnoIfRetry', but discards the result.
387 throwErrnoIfRetry_ :: (a -> Bool) -> String -> IO a -> IO ()
388 throwErrnoIfRetry_ pred loc f = void $ throwErrnoIfRetry pred loc f
390 -- | as 'throwErrnoIfRetryMayBlock', but discards the result.
392 throwErrnoIfRetryMayBlock_ :: (a -> Bool) -> String -> IO a -> IO b -> IO ()
393 throwErrnoIfRetryMayBlock_ pred loc f on_block
394 = void $ throwErrnoIfRetryMayBlock pred loc f on_block
396 -- | Throw an 'IOError' corresponding to the current value of 'getErrno'
397 -- if the 'IO' action returns a result of @-1@.
399 throwErrnoIfMinus1 :: Num a => String -> IO a -> IO a
400 throwErrnoIfMinus1 = throwErrnoIf (== -1)
402 -- | as 'throwErrnoIfMinus1', but discards the result.
404 throwErrnoIfMinus1_ :: Num a => String -> IO a -> IO ()
405 throwErrnoIfMinus1_ = throwErrnoIf_ (== -1)
407 -- | Throw an 'IOError' corresponding to the current value of 'getErrno'
408 -- if the 'IO' action returns a result of @-1@, but retries in case of
409 -- an interrupted operation.
411 throwErrnoIfMinus1Retry :: Num a => String -> IO a -> IO a
412 throwErrnoIfMinus1Retry = throwErrnoIfRetry (== -1)
414 -- | as 'throwErrnoIfMinus1', but discards the result.
416 throwErrnoIfMinus1Retry_ :: Num a => String -> IO a -> IO ()
417 throwErrnoIfMinus1Retry_ = throwErrnoIfRetry_ (== -1)
419 -- | as 'throwErrnoIfMinus1Retry', but checks for operations that would block.
421 throwErrnoIfMinus1RetryMayBlock :: Num a => String -> IO a -> IO b -> IO a
422 throwErrnoIfMinus1RetryMayBlock = throwErrnoIfRetryMayBlock (== -1)
424 -- | as 'throwErrnoIfMinus1RetryMayBlock', but discards the result.
426 throwErrnoIfMinus1RetryMayBlock_ :: Num a => String -> IO a -> IO b -> IO ()
427 throwErrnoIfMinus1RetryMayBlock_ = throwErrnoIfRetryMayBlock_ (== -1)
429 -- | Throw an 'IOError' corresponding to the current value of 'getErrno'
430 -- if the 'IO' action returns 'nullPtr'.
432 throwErrnoIfNull :: String -> IO (Ptr a) -> IO (Ptr a)
433 throwErrnoIfNull = throwErrnoIf (== nullPtr)
435 -- | Throw an 'IOError' corresponding to the current value of 'getErrno'
436 -- if the 'IO' action returns 'nullPtr',
437 -- but retry in case of an interrupted operation.
439 throwErrnoIfNullRetry :: String -> IO (Ptr a) -> IO (Ptr a)
440 throwErrnoIfNullRetry = throwErrnoIfRetry (== nullPtr)
442 -- | as 'throwErrnoIfNullRetry', but checks for operations that would block.
444 throwErrnoIfNullRetryMayBlock :: String -> IO (Ptr a) -> IO b -> IO (Ptr a)
445 throwErrnoIfNullRetryMayBlock = throwErrnoIfRetryMayBlock (== nullPtr)
447 -- conversion of an "errno" value into IO error
448 -- --------------------------------------------
450 -- | Construct a Haskell 98 I\/O error based on the given 'Errno' value.
451 -- The optional information can be used to improve the accuracy of
454 errnoToIOError :: String -- ^ the location where the error occurred
455 -> Errno -- ^ the error number
456 -> Maybe Handle -- ^ optional handle associated with the error
457 -> Maybe String -- ^ optional filename associated with the error
459 errnoToIOError loc errno maybeHdl maybeName = unsafePerformIO $ do
460 str <- strerror errno >>= peekCString
461 #if __GLASGOW_HASKELL__
462 return (IOError maybeHdl errType loc str maybeName)
465 | errno == eOK = OtherError
466 | errno == e2BIG = ResourceExhausted
467 | errno == eACCES = PermissionDenied
468 | errno == eADDRINUSE = ResourceBusy
469 | errno == eADDRNOTAVAIL = UnsupportedOperation
470 | errno == eADV = OtherError
471 | errno == eAFNOSUPPORT = UnsupportedOperation
472 | errno == eAGAIN = ResourceExhausted
473 | errno == eALREADY = AlreadyExists
474 | errno == eBADF = OtherError
475 | errno == eBADMSG = InappropriateType
476 | errno == eBADRPC = OtherError
477 | errno == eBUSY = ResourceBusy
478 | errno == eCHILD = NoSuchThing
479 | errno == eCOMM = ResourceVanished
480 | errno == eCONNABORTED = OtherError
481 | errno == eCONNREFUSED = NoSuchThing
482 | errno == eCONNRESET = ResourceVanished
483 | errno == eDEADLK = ResourceBusy
484 | errno == eDESTADDRREQ = InvalidArgument
485 | errno == eDIRTY = UnsatisfiedConstraints
486 | errno == eDOM = InvalidArgument
487 | errno == eDQUOT = PermissionDenied
488 | errno == eEXIST = AlreadyExists
489 | errno == eFAULT = OtherError
490 | errno == eFBIG = PermissionDenied
491 | errno == eFTYPE = InappropriateType
492 | errno == eHOSTDOWN = NoSuchThing
493 | errno == eHOSTUNREACH = NoSuchThing
494 | errno == eIDRM = ResourceVanished
495 | errno == eILSEQ = InvalidArgument
496 | errno == eINPROGRESS = AlreadyExists
497 | errno == eINTR = Interrupted
498 | errno == eINVAL = InvalidArgument
499 | errno == eIO = HardwareFault
500 | errno == eISCONN = AlreadyExists
501 | errno == eISDIR = InappropriateType
502 | errno == eLOOP = InvalidArgument
503 | errno == eMFILE = ResourceExhausted
504 | errno == eMLINK = ResourceExhausted
505 | errno == eMSGSIZE = ResourceExhausted
506 | errno == eMULTIHOP = UnsupportedOperation
507 | errno == eNAMETOOLONG = InvalidArgument
508 | errno == eNETDOWN = ResourceVanished
509 | errno == eNETRESET = ResourceVanished
510 | errno == eNETUNREACH = NoSuchThing
511 | errno == eNFILE = ResourceExhausted
512 | errno == eNOBUFS = ResourceExhausted
513 | errno == eNODATA = NoSuchThing
514 | errno == eNODEV = UnsupportedOperation
515 | errno == eNOENT = NoSuchThing
516 | errno == eNOEXEC = InvalidArgument
517 | errno == eNOLCK = ResourceExhausted
518 | errno == eNOLINK = ResourceVanished
519 | errno == eNOMEM = ResourceExhausted
520 | errno == eNOMSG = NoSuchThing
521 | errno == eNONET = NoSuchThing
522 | errno == eNOPROTOOPT = UnsupportedOperation
523 | errno == eNOSPC = ResourceExhausted
524 | errno == eNOSR = ResourceExhausted
525 | errno == eNOSTR = InvalidArgument
526 | errno == eNOSYS = UnsupportedOperation
527 | errno == eNOTBLK = InvalidArgument
528 | errno == eNOTCONN = InvalidArgument
529 | errno == eNOTDIR = InappropriateType
530 | errno == eNOTEMPTY = UnsatisfiedConstraints
531 | errno == eNOTSOCK = InvalidArgument
532 | errno == eNOTTY = IllegalOperation
533 | errno == eNXIO = NoSuchThing
534 | errno == eOPNOTSUPP = UnsupportedOperation
535 | errno == ePERM = PermissionDenied
536 | errno == ePFNOSUPPORT = UnsupportedOperation
537 | errno == ePIPE = ResourceVanished
538 | errno == ePROCLIM = PermissionDenied
539 | errno == ePROCUNAVAIL = UnsupportedOperation
540 | errno == ePROGMISMATCH = ProtocolError
541 | errno == ePROGUNAVAIL = UnsupportedOperation
542 | errno == ePROTO = ProtocolError
543 | errno == ePROTONOSUPPORT = ProtocolError
544 | errno == ePROTOTYPE = ProtocolError
545 | errno == eRANGE = UnsupportedOperation
546 | errno == eREMCHG = ResourceVanished
547 | errno == eREMOTE = IllegalOperation
548 | errno == eROFS = PermissionDenied
549 | errno == eRPCMISMATCH = ProtocolError
550 | errno == eRREMOTE = IllegalOperation
551 | errno == eSHUTDOWN = IllegalOperation
552 | errno == eSOCKTNOSUPPORT = UnsupportedOperation
553 | errno == eSPIPE = UnsupportedOperation
554 | errno == eSRCH = NoSuchThing
555 | errno == eSRMNT = UnsatisfiedConstraints
556 | errno == eSTALE = ResourceVanished
557 | errno == eTIME = TimeExpired
558 | errno == eTIMEDOUT = TimeExpired
559 | errno == eTOOMANYREFS = ResourceExhausted
560 | errno == eTXTBSY = ResourceBusy
561 | errno == eUSERS = ResourceExhausted
562 | errno == eWOULDBLOCK = OtherError
563 | errno == eXDEV = UnsupportedOperation
564 | otherwise = OtherError
566 return (userError (loc ++ ": " ++ str ++ maybe "" (": "++) maybeName))
569 foreign import ccall unsafe "string.h" strerror :: Errno -> IO (Ptr CChar)