-- * Haskell representations of @errno@ values
- Errno(..), -- instance: Eq
+ Errno(..), -- instance: Eq
-- ** Common @errno@ symbols
-- | Different operating systems and\/or C libraries often support
-- ** 'Errno' functions
-- :: Errno
- isValidErrno, -- :: Errno -> Bool
+ isValidErrno, -- :: Errno -> Bool
-- access to the current thread's "errno" value
--
throwErrnoIfRetry, -- :: (a -> Bool) -> String -> IO a -> IO a
throwErrnoIfRetry_, -- :: (a -> Bool) -> String -> IO a -> IO ()
throwErrnoIfMinus1, -- :: Num a
- -- => String -> IO a -> IO a
+ -- => String -> IO a -> IO a
throwErrnoIfMinus1_, -- :: Num a
- -- => String -> IO a -> IO ()
- throwErrnoIfMinus1Retry,
- -- :: Num a
- -- => String -> IO a -> IO a
+ -- => String -> IO a -> IO ()
+ throwErrnoIfMinus1Retry,
+ -- :: Num a
+ -- => String -> IO a -> IO a
throwErrnoIfMinus1Retry_,
- -- :: Num a
- -- => String -> IO a -> IO ()
- throwErrnoIfNull, -- :: String -> IO (Ptr a) -> IO (Ptr a)
+ -- :: Num a
+ -- => String -> IO a -> IO ()
+ throwErrnoIfNull, -- :: String -> IO (Ptr a) -> IO (Ptr a)
throwErrnoIfNullRetry,-- :: String -> IO (Ptr a) -> IO (Ptr a)
throwErrnoIfRetryMayBlock,
import Foreign.Ptr
import Foreign.C.Types
import Foreign.C.String
-import Foreign.Marshal.Error ( void )
+import Foreign.Marshal.Error ( void )
import Data.Maybe
#if __GLASGOW_HASKELL__
import GHC.Num
import GHC.Base
#elif __HUGS__
-import Hugs.Prelude ( Handle, IOError, ioError )
-import System.IO.Unsafe ( unsafePerformIO )
+import Hugs.Prelude ( Handle, IOError, ioError )
+import System.IO.Unsafe ( unsafePerformIO )
#else
-import System.IO ( Handle )
-import System.IO.Error ( IOError, ioError )
-import System.IO.Unsafe ( unsafePerformIO )
+import System.IO ( Handle )
+import System.IO.Error ( IOError, ioError )
+import System.IO.Unsafe ( unsafePerformIO )
#endif
#ifdef __HUGS__
instance Eq Errno where
errno1@(Errno no1) == errno2@(Errno no2)
| isValidErrno errno1 && isValidErrno errno2 = no1 == no2
- | otherwise = False
+ | otherwise = False
-- common "errno" symbols
--
ePROGMISMATCH, ePROGUNAVAIL, ePROTO, ePROTONOSUPPORT, ePROTOTYPE,
eRANGE, eREMCHG, eREMOTE, eROFS, eRPCMISMATCH, eRREMOTE, eSHUTDOWN,
eSOCKTNOSUPPORT, eSPIPE, eSRCH, eSRMNT, eSTALE, eTIME, eTIMEDOUT,
- eTOOMANYREFS, eTXTBSY, eUSERS, eWOULDBLOCK, eXDEV :: Errno
+ eTOOMANYREFS, eTXTBSY, eUSERS, eWOULDBLOCK, eXDEV :: Errno
--
-- the cCONST_XXX identifiers are cpp symbols whose value is computed by
-- configure
#include "Errno.hs"
#else
e2BIG = Errno (CONST_E2BIG)
-eACCES = Errno (CONST_EACCES)
-eADDRINUSE = Errno (CONST_EADDRINUSE)
-eADDRNOTAVAIL = Errno (CONST_EADDRNOTAVAIL)
-eADV = Errno (CONST_EADV)
-eAFNOSUPPORT = Errno (CONST_EAFNOSUPPORT)
-eAGAIN = Errno (CONST_EAGAIN)
-eALREADY = Errno (CONST_EALREADY)
-eBADF = Errno (CONST_EBADF)
-eBADMSG = Errno (CONST_EBADMSG)
-eBADRPC = Errno (CONST_EBADRPC)
-eBUSY = Errno (CONST_EBUSY)
-eCHILD = Errno (CONST_ECHILD)
-eCOMM = Errno (CONST_ECOMM)
-eCONNABORTED = Errno (CONST_ECONNABORTED)
-eCONNREFUSED = Errno (CONST_ECONNREFUSED)
-eCONNRESET = Errno (CONST_ECONNRESET)
-eDEADLK = Errno (CONST_EDEADLK)
-eDESTADDRREQ = Errno (CONST_EDESTADDRREQ)
-eDIRTY = Errno (CONST_EDIRTY)
-eDOM = Errno (CONST_EDOM)
-eDQUOT = Errno (CONST_EDQUOT)
-eEXIST = Errno (CONST_EEXIST)
-eFAULT = Errno (CONST_EFAULT)
-eFBIG = Errno (CONST_EFBIG)
-eFTYPE = Errno (CONST_EFTYPE)
-eHOSTDOWN = Errno (CONST_EHOSTDOWN)
-eHOSTUNREACH = Errno (CONST_EHOSTUNREACH)
-eIDRM = Errno (CONST_EIDRM)
-eILSEQ = Errno (CONST_EILSEQ)
-eINPROGRESS = Errno (CONST_EINPROGRESS)
-eINTR = Errno (CONST_EINTR)
-eINVAL = Errno (CONST_EINVAL)
-eIO = Errno (CONST_EIO)
-eISCONN = Errno (CONST_EISCONN)
-eISDIR = Errno (CONST_EISDIR)
-eLOOP = Errno (CONST_ELOOP)
-eMFILE = Errno (CONST_EMFILE)
-eMLINK = Errno (CONST_EMLINK)
-eMSGSIZE = Errno (CONST_EMSGSIZE)
-eMULTIHOP = Errno (CONST_EMULTIHOP)
-eNAMETOOLONG = Errno (CONST_ENAMETOOLONG)
-eNETDOWN = Errno (CONST_ENETDOWN)
-eNETRESET = Errno (CONST_ENETRESET)
-eNETUNREACH = Errno (CONST_ENETUNREACH)
-eNFILE = Errno (CONST_ENFILE)
-eNOBUFS = Errno (CONST_ENOBUFS)
-eNODATA = Errno (CONST_ENODATA)
-eNODEV = Errno (CONST_ENODEV)
-eNOENT = Errno (CONST_ENOENT)
-eNOEXEC = Errno (CONST_ENOEXEC)
-eNOLCK = Errno (CONST_ENOLCK)
-eNOLINK = Errno (CONST_ENOLINK)
-eNOMEM = Errno (CONST_ENOMEM)
-eNOMSG = Errno (CONST_ENOMSG)
-eNONET = Errno (CONST_ENONET)
-eNOPROTOOPT = Errno (CONST_ENOPROTOOPT)
-eNOSPC = Errno (CONST_ENOSPC)
-eNOSR = Errno (CONST_ENOSR)
-eNOSTR = Errno (CONST_ENOSTR)
-eNOSYS = Errno (CONST_ENOSYS)
-eNOTBLK = Errno (CONST_ENOTBLK)
-eNOTCONN = Errno (CONST_ENOTCONN)
-eNOTDIR = Errno (CONST_ENOTDIR)
-eNOTEMPTY = Errno (CONST_ENOTEMPTY)
-eNOTSOCK = Errno (CONST_ENOTSOCK)
-eNOTTY = Errno (CONST_ENOTTY)
-eNXIO = Errno (CONST_ENXIO)
-eOPNOTSUPP = Errno (CONST_EOPNOTSUPP)
-ePERM = Errno (CONST_EPERM)
-ePFNOSUPPORT = Errno (CONST_EPFNOSUPPORT)
-ePIPE = Errno (CONST_EPIPE)
-ePROCLIM = Errno (CONST_EPROCLIM)
-ePROCUNAVAIL = Errno (CONST_EPROCUNAVAIL)
-ePROGMISMATCH = Errno (CONST_EPROGMISMATCH)
-ePROGUNAVAIL = Errno (CONST_EPROGUNAVAIL)
-ePROTO = Errno (CONST_EPROTO)
+eACCES = Errno (CONST_EACCES)
+eADDRINUSE = Errno (CONST_EADDRINUSE)
+eADDRNOTAVAIL = Errno (CONST_EADDRNOTAVAIL)
+eADV = Errno (CONST_EADV)
+eAFNOSUPPORT = Errno (CONST_EAFNOSUPPORT)
+eAGAIN = Errno (CONST_EAGAIN)
+eALREADY = Errno (CONST_EALREADY)
+eBADF = Errno (CONST_EBADF)
+eBADMSG = Errno (CONST_EBADMSG)
+eBADRPC = Errno (CONST_EBADRPC)
+eBUSY = Errno (CONST_EBUSY)
+eCHILD = Errno (CONST_ECHILD)
+eCOMM = Errno (CONST_ECOMM)
+eCONNABORTED = Errno (CONST_ECONNABORTED)
+eCONNREFUSED = Errno (CONST_ECONNREFUSED)
+eCONNRESET = Errno (CONST_ECONNRESET)
+eDEADLK = Errno (CONST_EDEADLK)
+eDESTADDRREQ = Errno (CONST_EDESTADDRREQ)
+eDIRTY = Errno (CONST_EDIRTY)
+eDOM = Errno (CONST_EDOM)
+eDQUOT = Errno (CONST_EDQUOT)
+eEXIST = Errno (CONST_EEXIST)
+eFAULT = Errno (CONST_EFAULT)
+eFBIG = Errno (CONST_EFBIG)
+eFTYPE = Errno (CONST_EFTYPE)
+eHOSTDOWN = Errno (CONST_EHOSTDOWN)
+eHOSTUNREACH = Errno (CONST_EHOSTUNREACH)
+eIDRM = Errno (CONST_EIDRM)
+eILSEQ = Errno (CONST_EILSEQ)
+eINPROGRESS = Errno (CONST_EINPROGRESS)
+eINTR = Errno (CONST_EINTR)
+eINVAL = Errno (CONST_EINVAL)
+eIO = Errno (CONST_EIO)
+eISCONN = Errno (CONST_EISCONN)
+eISDIR = Errno (CONST_EISDIR)
+eLOOP = Errno (CONST_ELOOP)
+eMFILE = Errno (CONST_EMFILE)
+eMLINK = Errno (CONST_EMLINK)
+eMSGSIZE = Errno (CONST_EMSGSIZE)
+eMULTIHOP = Errno (CONST_EMULTIHOP)
+eNAMETOOLONG = Errno (CONST_ENAMETOOLONG)
+eNETDOWN = Errno (CONST_ENETDOWN)
+eNETRESET = Errno (CONST_ENETRESET)
+eNETUNREACH = Errno (CONST_ENETUNREACH)
+eNFILE = Errno (CONST_ENFILE)
+eNOBUFS = Errno (CONST_ENOBUFS)
+eNODATA = Errno (CONST_ENODATA)
+eNODEV = Errno (CONST_ENODEV)
+eNOENT = Errno (CONST_ENOENT)
+eNOEXEC = Errno (CONST_ENOEXEC)
+eNOLCK = Errno (CONST_ENOLCK)
+eNOLINK = Errno (CONST_ENOLINK)
+eNOMEM = Errno (CONST_ENOMEM)
+eNOMSG = Errno (CONST_ENOMSG)
+eNONET = Errno (CONST_ENONET)
+eNOPROTOOPT = Errno (CONST_ENOPROTOOPT)
+eNOSPC = Errno (CONST_ENOSPC)
+eNOSR = Errno (CONST_ENOSR)
+eNOSTR = Errno (CONST_ENOSTR)
+eNOSYS = Errno (CONST_ENOSYS)
+eNOTBLK = Errno (CONST_ENOTBLK)
+eNOTCONN = Errno (CONST_ENOTCONN)
+eNOTDIR = Errno (CONST_ENOTDIR)
+eNOTEMPTY = Errno (CONST_ENOTEMPTY)
+eNOTSOCK = Errno (CONST_ENOTSOCK)
+eNOTTY = Errno (CONST_ENOTTY)
+eNXIO = Errno (CONST_ENXIO)
+eOPNOTSUPP = Errno (CONST_EOPNOTSUPP)
+ePERM = Errno (CONST_EPERM)
+ePFNOSUPPORT = Errno (CONST_EPFNOSUPPORT)
+ePIPE = Errno (CONST_EPIPE)
+ePROCLIM = Errno (CONST_EPROCLIM)
+ePROCUNAVAIL = Errno (CONST_EPROCUNAVAIL)
+ePROGMISMATCH = Errno (CONST_EPROGMISMATCH)
+ePROGUNAVAIL = Errno (CONST_EPROGUNAVAIL)
+ePROTO = Errno (CONST_EPROTO)
ePROTONOSUPPORT = Errno (CONST_EPROTONOSUPPORT)
-ePROTOTYPE = Errno (CONST_EPROTOTYPE)
-eRANGE = Errno (CONST_ERANGE)
-eREMCHG = Errno (CONST_EREMCHG)
-eREMOTE = Errno (CONST_EREMOTE)
-eROFS = Errno (CONST_EROFS)
-eRPCMISMATCH = Errno (CONST_ERPCMISMATCH)
-eRREMOTE = Errno (CONST_ERREMOTE)
-eSHUTDOWN = Errno (CONST_ESHUTDOWN)
+ePROTOTYPE = Errno (CONST_EPROTOTYPE)
+eRANGE = Errno (CONST_ERANGE)
+eREMCHG = Errno (CONST_EREMCHG)
+eREMOTE = Errno (CONST_EREMOTE)
+eROFS = Errno (CONST_EROFS)
+eRPCMISMATCH = Errno (CONST_ERPCMISMATCH)
+eRREMOTE = Errno (CONST_ERREMOTE)
+eSHUTDOWN = Errno (CONST_ESHUTDOWN)
eSOCKTNOSUPPORT = Errno (CONST_ESOCKTNOSUPPORT)
-eSPIPE = Errno (CONST_ESPIPE)
-eSRCH = Errno (CONST_ESRCH)
-eSRMNT = Errno (CONST_ESRMNT)
-eSTALE = Errno (CONST_ESTALE)
-eTIME = Errno (CONST_ETIME)
-eTIMEDOUT = Errno (CONST_ETIMEDOUT)
-eTOOMANYREFS = Errno (CONST_ETOOMANYREFS)
-eTXTBSY = Errno (CONST_ETXTBSY)
-eUSERS = Errno (CONST_EUSERS)
-eWOULDBLOCK = Errno (CONST_EWOULDBLOCK)
-eXDEV = Errno (CONST_EXDEV)
+eSPIPE = Errno (CONST_ESPIPE)
+eSRCH = Errno (CONST_ESRCH)
+eSRMNT = Errno (CONST_ESRMNT)
+eSTALE = Errno (CONST_ESTALE)
+eTIME = Errno (CONST_ETIME)
+eTIMEDOUT = Errno (CONST_ETIMEDOUT)
+eTOOMANYREFS = Errno (CONST_ETOOMANYREFS)
+eTXTBSY = Errno (CONST_ETXTBSY)
+eUSERS = Errno (CONST_EUSERS)
+eWOULDBLOCK = Errno (CONST_EWOULDBLOCK)
+eXDEV = Errno (CONST_EXDEV)
#endif
-- | Yield 'True' if the given 'Errno' value is valid on the system.
-- | Throw an 'IOError' corresponding to the current value of 'getErrno'.
--
-throwErrno :: String -- ^ textual description of the error location
- -> IO a
+throwErrno :: String -- ^ textual description of the error location
+ -> IO a
throwErrno loc =
do
errno <- getErrno
-- | Throw an 'IOError' corresponding to the current value of 'getErrno'
-- if the result value of the 'IO' action meets the given predicate.
--
-throwErrnoIf :: (a -> Bool) -- ^ predicate to apply to the result value
- -- of the 'IO' operation
- -> String -- ^ textual description of the location
- -> IO a -- ^ the 'IO' operation to be executed
- -> IO a
+throwErrnoIf :: (a -> Bool) -- ^ predicate to apply to the result value
+ -- of the 'IO' operation
+ -> String -- ^ textual description of the location
+ -> IO a -- ^ the 'IO' operation to be executed
+ -> IO a
throwErrnoIf pred loc f =
do
res <- f
res <- f
if pred res
then do
- err <- getErrno
- if err == eINTR
- then throwErrnoIfRetry pred loc f
- else throwErrno loc
+ err <- getErrno
+ if err == eINTR
+ then throwErrnoIfRetry pred loc f
+ else throwErrno loc
else return res
-- | as 'throwErrnoIfRetry', but checks for operations that would block and
-- executes an alternative action before retrying in that case.
--
throwErrnoIfRetryMayBlock
- :: (a -> Bool) -- ^ predicate to apply to the result value
- -- of the 'IO' operation
- -> String -- ^ textual description of the location
- -> IO a -- ^ the 'IO' operation to be executed
- -> IO b -- ^ action to execute before retrying if
- -- an immediate retry would block
- -> IO a
+ :: (a -> Bool) -- ^ predicate to apply to the result value
+ -- of the 'IO' operation
+ -> String -- ^ textual description of the location
+ -> IO a -- ^ the 'IO' operation to be executed
+ -> IO b -- ^ action to execute before retrying if
+ -- an immediate retry would block
+ -> IO a
throwErrnoIfRetryMayBlock pred loc f on_block =
do
res <- f
if pred res
then do
- err <- getErrno
- if err == eINTR
- then throwErrnoIfRetryMayBlock pred loc f on_block
+ err <- getErrno
+ if err == eINTR
+ then throwErrnoIfRetryMayBlock pred loc f on_block
else if err == eWOULDBLOCK || err == eAGAIN
- then do on_block; throwErrnoIfRetryMayBlock pred loc f on_block
+ then do on_block; throwErrnoIfRetryMayBlock pred loc f on_block
else throwErrno loc
else return res
-- The optional information can be used to improve the accuracy of
-- error messages.
--
-errnoToIOError :: String -- ^ the location where the error occurred
- -> Errno -- ^ the error number
- -> Maybe Handle -- ^ optional handle associated with the error
- -> Maybe String -- ^ optional filename associated with the error
- -> IOError
+errnoToIOError :: String -- ^ the location where the error occurred
+ -> Errno -- ^ the error number
+ -> Maybe Handle -- ^ optional handle associated with the error
+ -> Maybe String -- ^ optional filename associated with the error
+ -> IOError
errnoToIOError loc errno maybeHdl maybeName = unsafePerformIO $ do
str <- strerror errno >>= peekCString
#if __GLASGOW_HASKELL__
projects / ghc-base.git / commitdiff