errno values
Haskell representation for errno values. The implementation is deliberately exposed, to allow users to add their own definitions of Errno values.
Constructors
Errno CIntInstances
Eq Errno Commonerrno symbols
Different operating systems and/or C libraries often support different values of errno. This module defines the common values, but due to the open definition of Errno users may add definitions which are not predefined.
ePROTONOSUPPORT :: ErrnoSource
eSOCKTNOSUPPORT :: ErrnoSource
Errno functions
isValidErrno :: Errno -> BoolSource
Yield True if the given Errno value is valid on the system. This implies that the Eq instance of Errno is also system dependent as it is only defined for valid values of Errno.
Get the current value of errno in the current thread.
resetErrno :: IO ()Source
Reset the current thread's errno value to eOK.
Arguments
:: Stringthe location where the error occurred
-> Errnothe error number
-> Maybe Handleoptional handle associated with the error
-> Maybe Stringoptional filename associated with the error
-> IOErrorConstruct an IOError based on the given Errno value. The optional information can be used to improve the accuracy of error messages.
Arguments
:: Stringtextual description of the error location
-> IO aThrow an IOError corresponding to the current value of getErrno.
Arguments
:: (a -> Bool)predicate to apply to the result value of the IO operation
textual description of the location
-> IO athe IO operation to be executed
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) -> String -> IO a -> IO ()Source
as throwErrnoIf, but discards the result of the IO action after error handling.
throwErrnoIfRetry :: (a -> Bool) -> String -> IO a -> IO aSource
as throwErrnoIf, but retry the IO action when it yields the error code eINTR - this amounts to the standard retry loop for interrupted POSIX system calls.
throwErrnoIfRetry_ :: (a -> Bool) -> String -> IO a -> IO ()Source
as throwErrnoIfRetry, but discards the result.
throwErrnoIfMinus1 :: (Eq a, Num a) => String -> IO a -> IO aSource
Throw an IOError corresponding to the current value of getErrno if the IO action returns a result of -1.
throwErrnoIfMinus1_ :: (Eq a, Num a) => String -> IO a -> IO ()Source
as throwErrnoIfMinus1, but discards the result.
throwErrnoIfMinus1Retry :: (Eq a, Num a) => String -> IO a -> IO aSource
Throw an IOError corresponding to the current value of getErrno if the IO action returns a result of -1, but retries in case of an interrupted operation.
throwErrnoIfMinus1Retry_ :: (Eq a, Num a) => String -> IO a -> IO ()Source
as throwErrnoIfMinus1, but discards the result.
throwErrnoIfNull :: String -> IO (Ptr a) -> IO (Ptr a)Source
Throw an IOError corresponding to the current value of getErrno if the IO action returns nullPtr.
throwErrnoIfNullRetry :: String -> IO (Ptr a) -> IO (Ptr a)Source
Throw an IOError corresponding to the current value of getErrno if the IO action returns nullPtr, but retry in case of an interrupted operation.
throwErrnoIfRetryMayBlockSource
Arguments
:: (a -> Bool)predicate to apply to the result value of the IO operation
textual description of the location
-> IO athe IO operation to be executed
action to execute before retrying if an immediate retry would block
-> IO aas throwErrnoIfRetry, but additionally if the operation yields the error code eAGAIN or eWOULDBLOCK, an alternative action is executed before retrying.
throwErrnoIfRetryMayBlock_ :: (a -> Bool) -> String -> IO a -> IO b -> IO ()Source
as throwErrnoIfRetryMayBlock, but discards the result.
throwErrnoIfMinus1RetryMayBlock :: (Eq a, Num a) => String -> IO a -> IO b -> IO aSource
as throwErrnoIfMinus1Retry, but checks for operations that would block.
throwErrnoIfMinus1RetryMayBlock_ :: (Eq a, Num a) => String -> IO a -> IO b -> IO ()Source
as throwErrnoIfMinus1RetryMayBlock, but discards the result.
throwErrnoIfNullRetryMayBlock :: String -> IO (Ptr a) -> IO b -> IO (Ptr a)Source
as throwErrnoIfNullRetry, but checks for operations that would block.
throwErrnoPath :: String -> FilePath -> IO aSource
as throwErrno, but exceptions include the given path when appropriate.
throwErrnoPathIf :: (a -> Bool) -> String -> FilePath -> IO a -> IO aSource
as throwErrnoIf, but exceptions include the given path when appropriate.
throwErrnoPathIf_ :: (a -> Bool) -> String -> FilePath -> IO a -> IO ()Source
as throwErrnoIf_, but exceptions include the given path when appropriate.
throwErrnoPathIfNull :: String -> FilePath -> IO (Ptr a) -> IO (Ptr a)Source
as throwErrnoIfNull, but exceptions include the given path when appropriate.
throwErrnoPathIfMinus1 :: (Eq a, Num a) => String -> FilePath -> IO a -> IO aSource
as throwErrnoIfMinus1, but exceptions include the given path when appropriate.
throwErrnoPathIfMinus1_ :: (Eq a, Num a) => String -> FilePath -> IO a -> IO ()Source
as throwErrnoIfMinus1_, but exceptions include the given path when appropriate.
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