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 representation for "errno" values
20 Errno(..), -- instance: Eq
21 eOK, e2BIG, eACCES, eADDRINUSE, eADDRNOTAVAIL, eADV, eAFNOSUPPORT, eAGAIN,
22 eALREADY, eBADF, eBADMSG, eBADRPC, eBUSY, eCHILD, eCOMM, eCONNABORTED,
23 eCONNREFUSED, eCONNRESET, eDEADLK, eDESTADDRREQ, eDIRTY, eDOM, eDQUOT,
24 eEXIST, eFAULT, eFBIG, eFTYPE, eHOSTDOWN, eHOSTUNREACH, eIDRM, eILSEQ,
25 eINPROGRESS, eINTR, eINVAL, eIO, eISCONN, eISDIR, eLOOP, eMFILE, eMLINK,
26 eMSGSIZE, eMULTIHOP, eNAMETOOLONG, eNETDOWN, eNETRESET, eNETUNREACH,
27 eNFILE, eNOBUFS, eNODATA, eNODEV, eNOENT, eNOEXEC, eNOLCK, eNOLINK,
28 eNOMEM, eNOMSG, eNONET, eNOPROTOOPT, eNOSPC, eNOSR, eNOSTR, eNOSYS,
29 eNOTBLK, eNOTCONN, eNOTDIR, eNOTEMPTY, eNOTSOCK, eNOTTY, eNXIO,
30 eOPNOTSUPP, ePERM, ePFNOSUPPORT, ePIPE, ePROCLIM, ePROCUNAVAIL,
31 ePROGMISMATCH, ePROGUNAVAIL, ePROTO, ePROTONOSUPPORT, ePROTOTYPE,
32 eRANGE, eREMCHG, eREMOTE, eROFS, eRPCMISMATCH, eRREMOTE, eSHUTDOWN,
33 eSOCKTNOSUPPORT, eSPIPE, eSRCH, eSRMNT, eSTALE, eTIME, eTIMEDOUT,
34 eTOOMANYREFS, eTXTBSY, eUSERS, eWOULDBLOCK, eXDEV,
36 isValidErrno, -- :: Errno -> Bool
38 -- access to the current thread's "errno" value
40 getErrno, -- :: IO Errno
41 resetErrno, -- :: IO ()
43 -- conversion of an "errno" value into IO error
45 errnoToIOError, -- :: String -- location
47 -- -> Maybe Handle -- handle
48 -- -> Maybe String -- filename
51 -- throw current "errno" value
53 throwErrno, -- :: String -> IO a
55 -- guards for IO operations that may fail
57 throwErrnoIf, -- :: (a -> Bool) -> String -> IO a -> IO a
58 throwErrnoIf_, -- :: (a -> Bool) -> String -> IO a -> IO ()
59 throwErrnoIfRetry, -- :: (a -> Bool) -> String -> IO a -> IO a
60 throwErrnoIfRetry_, -- :: (a -> Bool) -> String -> IO a -> IO ()
61 throwErrnoIfMinus1, -- :: Num a
62 -- => String -> IO a -> IO a
63 throwErrnoIfMinus1_, -- :: Num a
64 -- => String -> IO a -> IO ()
65 throwErrnoIfMinus1Retry,
67 -- => String -> IO a -> IO a
68 throwErrnoIfMinus1Retry_,
70 -- => String -> IO a -> IO ()
71 throwErrnoIfNull, -- :: String -> IO (Ptr a) -> IO (Ptr a)
72 throwErrnoIfNullRetry,-- :: String -> IO (Ptr a) -> IO (Ptr a)
74 throwErrnoIfRetryMayBlock,
75 throwErrnoIfRetryMayBlock_,
76 throwErrnoIfMinus1RetryMayBlock,
77 throwErrnoIfMinus1RetryMayBlock_,
78 throwErrnoIfNullRetryMayBlock
82 -- this is were we get the CCONST_XXX definitions from that configure
89 -- system dependent imports
90 -- ------------------------
92 -- GHC allows us to get at the guts inside IO errors/exceptions
94 #if __GLASGOW_HASKELL__
95 import GHC.IOBase (IOException(..), IOErrorType(..))
96 #endif /* __GLASGOW_HASKELL__ */
102 import Foreign.Storable
104 import Foreign.C.Types
105 import Foreign.C.String
106 import Foreign.Marshal.Error ( void )
109 #if __GLASGOW_HASKELL__
115 import System.IO ( IOError, Handle, ioError )
116 import System.IO.Unsafe ( unsafePerformIO )
120 {-# CBITS errno.c #-}
126 -- import of C function that gives address of errno
127 -- This function exists because errno is a variable on some systems, but on
128 -- Windows it is a macro for a function...
129 -- [yes, global variables and thread safety don't really go hand-in-hand. -- sof]
131 foreign import ccall unsafe "errno.h &errno" _errno :: Ptr CInt
133 foreign import ccall unsafe "HsBase.h ghcErrno" _errno :: Ptr CInt
136 -- Haskell representation for "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 (CCONST_E2BIG)
170 eACCES = Errno (CCONST_EACCES)
171 eADDRINUSE = Errno (CCONST_EADDRINUSE)
172 eADDRNOTAVAIL = Errno (CCONST_EADDRNOTAVAIL)
173 eADV = Errno (CCONST_EADV)
174 eAFNOSUPPORT = Errno (CCONST_EAFNOSUPPORT)
175 eAGAIN = Errno (CCONST_EAGAIN)
176 eALREADY = Errno (CCONST_EALREADY)
177 eBADF = Errno (CCONST_EBADF)
178 eBADMSG = Errno (CCONST_EBADMSG)
179 eBADRPC = Errno (CCONST_EBADRPC)
180 eBUSY = Errno (CCONST_EBUSY)
181 eCHILD = Errno (CCONST_ECHILD)
182 eCOMM = Errno (CCONST_ECOMM)
183 eCONNABORTED = Errno (CCONST_ECONNABORTED)
184 eCONNREFUSED = Errno (CCONST_ECONNREFUSED)
185 eCONNRESET = Errno (CCONST_ECONNRESET)
186 eDEADLK = Errno (CCONST_EDEADLK)
187 eDESTADDRREQ = Errno (CCONST_EDESTADDRREQ)
188 eDIRTY = Errno (CCONST_EDIRTY)
189 eDOM = Errno (CCONST_EDOM)
190 eDQUOT = Errno (CCONST_EDQUOT)
191 eEXIST = Errno (CCONST_EEXIST)
192 eFAULT = Errno (CCONST_EFAULT)
193 eFBIG = Errno (CCONST_EFBIG)
194 eFTYPE = Errno (CCONST_EFTYPE)
195 eHOSTDOWN = Errno (CCONST_EHOSTDOWN)
196 eHOSTUNREACH = Errno (CCONST_EHOSTUNREACH)
197 eIDRM = Errno (CCONST_EIDRM)
198 eILSEQ = Errno (CCONST_EILSEQ)
199 eINPROGRESS = Errno (CCONST_EINPROGRESS)
200 eINTR = Errno (CCONST_EINTR)
201 eINVAL = Errno (CCONST_EINVAL)
202 eIO = Errno (CCONST_EIO)
203 eISCONN = Errno (CCONST_EISCONN)
204 eISDIR = Errno (CCONST_EISDIR)
205 eLOOP = Errno (CCONST_ELOOP)
206 eMFILE = Errno (CCONST_EMFILE)
207 eMLINK = Errno (CCONST_EMLINK)
208 eMSGSIZE = Errno (CCONST_EMSGSIZE)
209 eMULTIHOP = Errno (CCONST_EMULTIHOP)
210 eNAMETOOLONG = Errno (CCONST_ENAMETOOLONG)
211 eNETDOWN = Errno (CCONST_ENETDOWN)
212 eNETRESET = Errno (CCONST_ENETRESET)
213 eNETUNREACH = Errno (CCONST_ENETUNREACH)
214 eNFILE = Errno (CCONST_ENFILE)
215 eNOBUFS = Errno (CCONST_ENOBUFS)
216 eNODATA = Errno (CCONST_ENODATA)
217 eNODEV = Errno (CCONST_ENODEV)
218 eNOENT = Errno (CCONST_ENOENT)
219 eNOEXEC = Errno (CCONST_ENOEXEC)
220 eNOLCK = Errno (CCONST_ENOLCK)
221 eNOLINK = Errno (CCONST_ENOLINK)
222 eNOMEM = Errno (CCONST_ENOMEM)
223 eNOMSG = Errno (CCONST_ENOMSG)
224 eNONET = Errno (CCONST_ENONET)
225 eNOPROTOOPT = Errno (CCONST_ENOPROTOOPT)
226 eNOSPC = Errno (CCONST_ENOSPC)
227 eNOSR = Errno (CCONST_ENOSR)
228 eNOSTR = Errno (CCONST_ENOSTR)
229 eNOSYS = Errno (CCONST_ENOSYS)
230 eNOTBLK = Errno (CCONST_ENOTBLK)
231 eNOTCONN = Errno (CCONST_ENOTCONN)
232 eNOTDIR = Errno (CCONST_ENOTDIR)
233 eNOTEMPTY = Errno (CCONST_ENOTEMPTY)
234 eNOTSOCK = Errno (CCONST_ENOTSOCK)
235 eNOTTY = Errno (CCONST_ENOTTY)
236 eNXIO = Errno (CCONST_ENXIO)
237 eOPNOTSUPP = Errno (CCONST_EOPNOTSUPP)
238 ePERM = Errno (CCONST_EPERM)
239 ePFNOSUPPORT = Errno (CCONST_EPFNOSUPPORT)
240 ePIPE = Errno (CCONST_EPIPE)
241 ePROCLIM = Errno (CCONST_EPROCLIM)
242 ePROCUNAVAIL = Errno (CCONST_EPROCUNAVAIL)
243 ePROGMISMATCH = Errno (CCONST_EPROGMISMATCH)
244 ePROGUNAVAIL = Errno (CCONST_EPROGUNAVAIL)
245 ePROTO = Errno (CCONST_EPROTO)
246 ePROTONOSUPPORT = Errno (CCONST_EPROTONOSUPPORT)
247 ePROTOTYPE = Errno (CCONST_EPROTOTYPE)
248 eRANGE = Errno (CCONST_ERANGE)
249 eREMCHG = Errno (CCONST_EREMCHG)
250 eREMOTE = Errno (CCONST_EREMOTE)
251 eROFS = Errno (CCONST_EROFS)
252 eRPCMISMATCH = Errno (CCONST_ERPCMISMATCH)
253 eRREMOTE = Errno (CCONST_ERREMOTE)
254 eSHUTDOWN = Errno (CCONST_ESHUTDOWN)
255 eSOCKTNOSUPPORT = Errno (CCONST_ESOCKTNOSUPPORT)
256 eSPIPE = Errno (CCONST_ESPIPE)
257 eSRCH = Errno (CCONST_ESRCH)
258 eSRMNT = Errno (CCONST_ESRMNT)
259 eSTALE = Errno (CCONST_ESTALE)
260 eTIME = Errno (CCONST_ETIME)
261 eTIMEDOUT = Errno (CCONST_ETIMEDOUT)
262 eTOOMANYREFS = Errno (CCONST_ETOOMANYREFS)
263 eTXTBSY = Errno (CCONST_ETXTBSY)
264 eUSERS = Errno (CCONST_EUSERS)
265 eWOULDBLOCK = Errno (CCONST_EWOULDBLOCK)
266 eXDEV = Errno (CCONST_EXDEV)
269 -- checks whether the given errno value is supported on the current
272 isValidErrno :: Errno -> Bool
274 -- the configure script sets all invalid "errno"s to -1
276 isValidErrno (Errno errno) = errno /= -1
279 -- access to the current thread's "errno" value
280 -- --------------------------------------------
282 -- yield the current thread's "errno" value
285 getErrno = do e <- peek _errno; return (Errno e)
287 -- set the current thread's "errno" value to 0
290 resetErrno = poke _errno 0
293 -- throw current "errno" value
294 -- ---------------------------
296 -- the common case: throw an IO error based on a textual description
297 -- of the error location and the current thread's "errno" value
299 throwErrno :: String -> IO a
303 ioError (errnoToIOError loc errno Nothing Nothing)
306 -- guards for IO operations that may fail
307 -- --------------------------------------
309 -- guard an IO operation and throw an "errno" based exception of the result
310 -- value of the IO operation meets the given predicate
312 throwErrnoIf :: (a -> Bool) -> String -> IO a -> IO a
313 throwErrnoIf pred loc f =
316 if pred res then throwErrno loc else return res
318 -- as `throwErrnoIf', but discards the result
320 throwErrnoIf_ :: (a -> Bool) -> String -> IO a -> IO ()
321 throwErrnoIf_ pred loc f = void $ throwErrnoIf pred loc f
323 -- as `throwErrnoIf', but retries interrupted IO operations (ie, those whose
326 throwErrnoIfRetry :: (a -> Bool) -> String -> IO a -> IO a
327 throwErrnoIfRetry pred loc f =
334 then throwErrnoIfRetry pred loc f
338 -- as `throwErrnoIfRetry', but checks for operations that would block and
339 -- executes an alternative action in that case.
341 throwErrnoIfRetryMayBlock :: (a -> Bool) -> String -> IO a -> IO b -> IO a
342 throwErrnoIfRetryMayBlock pred loc f on_block =
349 then throwErrnoIfRetryMayBlock pred loc f on_block
350 else if err == eWOULDBLOCK || err == eAGAIN
351 then do on_block; throwErrnoIfRetryMayBlock pred loc f on_block
355 -- as `throwErrnoIfRetry', but discards the result
357 throwErrnoIfRetry_ :: (a -> Bool) -> String -> IO a -> IO ()
358 throwErrnoIfRetry_ pred loc f = void $ throwErrnoIfRetry pred loc f
360 -- as `throwErrnoIfRetryMayBlock', but discards the result
362 throwErrnoIfRetryMayBlock_ :: (a -> Bool) -> String -> IO a -> IO b -> IO ()
363 throwErrnoIfRetryMayBlock_ pred loc f on_block
364 = void $ throwErrnoIfRetryMayBlock pred loc f on_block
366 -- throws "errno" if a result of "-1" is returned
368 throwErrnoIfMinus1 :: Num a => String -> IO a -> IO a
369 throwErrnoIfMinus1 = throwErrnoIf (== -1)
371 -- as `throwErrnoIfMinus1', but discards the result
373 throwErrnoIfMinus1_ :: Num a => String -> IO a -> IO ()
374 throwErrnoIfMinus1_ = throwErrnoIf_ (== -1)
376 -- throws "errno" if a result of "-1" is returned, but retries in case of an
377 -- interrupted operation
379 throwErrnoIfMinus1Retry :: Num a => String -> IO a -> IO a
380 throwErrnoIfMinus1Retry = throwErrnoIfRetry (== -1)
382 -- as `throwErrnoIfMinus1', but discards the result
384 throwErrnoIfMinus1Retry_ :: Num a => String -> IO a -> IO ()
385 throwErrnoIfMinus1Retry_ = throwErrnoIfRetry_ (== -1)
387 -- as throwErrnoIfMinus1Retry, but checks for operations that would block
389 throwErrnoIfMinus1RetryMayBlock :: Num a => String -> IO a -> IO b -> IO a
390 throwErrnoIfMinus1RetryMayBlock = throwErrnoIfRetryMayBlock (== -1)
392 -- as `throwErrnoIfMinus1RetryMayBlock', but discards the result
394 throwErrnoIfMinus1RetryMayBlock_ :: Num a => String -> IO a -> IO b -> IO ()
395 throwErrnoIfMinus1RetryMayBlock_ = throwErrnoIfRetryMayBlock_ (== -1)
397 -- throws "errno" if a result of a NULL pointer is returned
399 throwErrnoIfNull :: String -> IO (Ptr a) -> IO (Ptr a)
400 throwErrnoIfNull = throwErrnoIf (== nullPtr)
402 -- throws "errno" if a result of a NULL pointer is returned, but retries in
403 -- case of an interrupted operation
405 throwErrnoIfNullRetry :: String -> IO (Ptr a) -> IO (Ptr a)
406 throwErrnoIfNullRetry = throwErrnoIfRetry (== nullPtr)
408 -- as throwErrnoIfNullRetry, but checks for operations that would block
410 throwErrnoIfNullRetryMayBlock :: String -> IO (Ptr a) -> IO b -> IO (Ptr a)
411 throwErrnoIfNullRetryMayBlock = throwErrnoIfRetryMayBlock (== nullPtr)
413 -- conversion of an "errno" value into IO error
414 -- --------------------------------------------
416 -- convert a location string, an "errno" value, an optional handle,
417 -- and an optional filename into a matching IO error
419 errnoToIOError :: String -> Errno -> Maybe Handle -> Maybe String -> IOError
420 errnoToIOError loc errno maybeHdl maybeName = unsafePerformIO $ do
421 str <- strerror errno >>= peekCString
422 #if __GLASGOW_HASKELL__
423 return (IOError maybeHdl errType loc str maybeName)
426 | errno == eOK = OtherError
427 | errno == e2BIG = ResourceExhausted
428 | errno == eACCES = PermissionDenied
429 | errno == eADDRINUSE = ResourceBusy
430 | errno == eADDRNOTAVAIL = UnsupportedOperation
431 | errno == eADV = OtherError
432 | errno == eAFNOSUPPORT = UnsupportedOperation
433 | errno == eAGAIN = ResourceExhausted
434 | errno == eALREADY = AlreadyExists
435 | errno == eBADF = OtherError
436 | errno == eBADMSG = InappropriateType
437 | errno == eBADRPC = OtherError
438 | errno == eBUSY = ResourceBusy
439 | errno == eCHILD = NoSuchThing
440 | errno == eCOMM = ResourceVanished
441 | errno == eCONNABORTED = OtherError
442 | errno == eCONNREFUSED = NoSuchThing
443 | errno == eCONNRESET = ResourceVanished
444 | errno == eDEADLK = ResourceBusy
445 | errno == eDESTADDRREQ = InvalidArgument
446 | errno == eDIRTY = UnsatisfiedConstraints
447 | errno == eDOM = InvalidArgument
448 | errno == eDQUOT = PermissionDenied
449 | errno == eEXIST = AlreadyExists
450 | errno == eFAULT = OtherError
451 | errno == eFBIG = PermissionDenied
452 | errno == eFTYPE = InappropriateType
453 | errno == eHOSTDOWN = NoSuchThing
454 | errno == eHOSTUNREACH = NoSuchThing
455 | errno == eIDRM = ResourceVanished
456 | errno == eILSEQ = InvalidArgument
457 | errno == eINPROGRESS = AlreadyExists
458 | errno == eINTR = Interrupted
459 | errno == eINVAL = InvalidArgument
460 | errno == eIO = HardwareFault
461 | errno == eISCONN = AlreadyExists
462 | errno == eISDIR = InappropriateType
463 | errno == eLOOP = InvalidArgument
464 | errno == eMFILE = ResourceExhausted
465 | errno == eMLINK = ResourceExhausted
466 | errno == eMSGSIZE = ResourceExhausted
467 | errno == eMULTIHOP = UnsupportedOperation
468 | errno == eNAMETOOLONG = InvalidArgument
469 | errno == eNETDOWN = ResourceVanished
470 | errno == eNETRESET = ResourceVanished
471 | errno == eNETUNREACH = NoSuchThing
472 | errno == eNFILE = ResourceExhausted
473 | errno == eNOBUFS = ResourceExhausted
474 | errno == eNODATA = NoSuchThing
475 | errno == eNODEV = UnsupportedOperation
476 | errno == eNOENT = NoSuchThing
477 | errno == eNOEXEC = InvalidArgument
478 | errno == eNOLCK = ResourceExhausted
479 | errno == eNOLINK = ResourceVanished
480 | errno == eNOMEM = ResourceExhausted
481 | errno == eNOMSG = NoSuchThing
482 | errno == eNONET = NoSuchThing
483 | errno == eNOPROTOOPT = UnsupportedOperation
484 | errno == eNOSPC = ResourceExhausted
485 | errno == eNOSR = ResourceExhausted
486 | errno == eNOSTR = InvalidArgument
487 | errno == eNOSYS = UnsupportedOperation
488 | errno == eNOTBLK = InvalidArgument
489 | errno == eNOTCONN = InvalidArgument
490 | errno == eNOTDIR = InappropriateType
491 | errno == eNOTEMPTY = UnsatisfiedConstraints
492 | errno == eNOTSOCK = InvalidArgument
493 | errno == eNOTTY = IllegalOperation
494 | errno == eNXIO = NoSuchThing
495 | errno == eOPNOTSUPP = UnsupportedOperation
496 | errno == ePERM = PermissionDenied
497 | errno == ePFNOSUPPORT = UnsupportedOperation
498 | errno == ePIPE = ResourceVanished
499 | errno == ePROCLIM = PermissionDenied
500 | errno == ePROCUNAVAIL = UnsupportedOperation
501 | errno == ePROGMISMATCH = ProtocolError
502 | errno == ePROGUNAVAIL = UnsupportedOperation
503 | errno == ePROTO = ProtocolError
504 | errno == ePROTONOSUPPORT = ProtocolError
505 | errno == ePROTOTYPE = ProtocolError
506 | errno == eRANGE = UnsupportedOperation
507 | errno == eREMCHG = ResourceVanished
508 | errno == eREMOTE = IllegalOperation
509 | errno == eROFS = PermissionDenied
510 | errno == eRPCMISMATCH = ProtocolError
511 | errno == eRREMOTE = IllegalOperation
512 | errno == eSHUTDOWN = IllegalOperation
513 | errno == eSOCKTNOSUPPORT = UnsupportedOperation
514 | errno == eSPIPE = UnsupportedOperation
515 | errno == eSRCH = NoSuchThing
516 | errno == eSRMNT = UnsatisfiedConstraints
517 | errno == eSTALE = ResourceVanished
518 | errno == eTIME = TimeExpired
519 | errno == eTIMEDOUT = TimeExpired
520 | errno == eTOOMANYREFS = ResourceExhausted
521 | errno == eTXTBSY = ResourceBusy
522 | errno == eUSERS = ResourceExhausted
523 | errno == eWOULDBLOCK = OtherError
524 | errno == eXDEV = UnsupportedOperation
525 | otherwise = OtherError
527 return (userError (loc ++ ": " ++ str ++ maybe "" (": "++) maybeName))
530 foreign import ccall unsafe "string.h" strerror :: Errno -> IO (Ptr CChar)