Safe Haskell	None
Language	Haskell2010

UnliftIO.IO

Description

Unlifted System.IO.

Since: unliftio-0.1.0.0

Synopsis

data IOMode
- = ReadMode
- | WriteMode
- | AppendMode
- | ReadWriteMode
data Handle
stdin :: Handle
stdout :: Handle
stderr :: Handle
withFile :: MonadUnliftIO m => FilePath -> IOMode -> (Handle -> m a) -> m a
withBinaryFile :: MonadUnliftIO m => FilePath -> IOMode -> (Handle -> m a) -> m a
hClose :: MonadIO m => Handle -> m ()
hFlush :: MonadIO m => Handle -> m ()
hFileSize :: MonadIO m => Handle -> m Integer
hSetFileSize :: MonadIO m => Handle -> Integer -> m ()
hIsEOF :: MonadIO m => Handle -> m Bool
data BufferMode
- = NoBuffering
- | LineBuffering
- | BlockBuffering (Maybe Int)
hSetBuffering :: MonadIO m => Handle -> BufferMode -> m ()
hGetBuffering :: MonadIO m => Handle -> m BufferMode
hSeek :: MonadIO m => Handle -> SeekMode -> Integer -> m ()
data SeekMode
hTell :: MonadIO m => Handle -> m Integer
hIsOpen :: MonadIO m => Handle -> m Bool
hIsClosed :: MonadIO m => Handle -> m Bool
hIsReadable :: MonadIO m => Handle -> m Bool
hIsWritable :: MonadIO m => Handle -> m Bool
hIsSeekable :: MonadIO m => Handle -> m Bool
hIsTerminalDevice :: MonadIO m => Handle -> m Bool
hSetEcho :: MonadIO m => Handle -> Bool -> m ()
hGetEcho :: MonadIO m => Handle -> m Bool
hWaitForInput :: MonadIO m => Handle -> Int -> m Bool
hReady :: MonadIO m => Handle -> m Bool
getMonotonicTime :: MonadIO m => m Double

Documentation

data IOMode #

See openFile

Constructors

ReadMode
WriteMode
AppendMode
ReadWriteMode

Instances

Enum IOMode
Instance details Defined in GHC.IO.IOMode Methods succ :: IOMode -> IOMode # pred :: IOMode -> IOMode # toEnum :: Int -> IOMode # fromEnum :: IOMode -> Int # enumFrom :: IOMode -> [IOMode] # enumFromThen :: IOMode -> IOMode -> [IOMode] # enumFromTo :: IOMode -> IOMode -> [IOMode] # enumFromThenTo :: IOMode -> IOMode -> IOMode -> [IOMode] #
Eq IOMode
Instance details Defined in GHC.IO.IOMode Methods (==) :: IOMode -> IOMode -> Bool # (/=) :: IOMode -> IOMode -> Bool #
Ord IOMode
Instance details Defined in GHC.IO.IOMode Methods compare :: IOMode -> IOMode -> Ordering # (<) :: IOMode -> IOMode -> Bool # (<=) :: IOMode -> IOMode -> Bool # (>) :: IOMode -> IOMode -> Bool # (>=) :: IOMode -> IOMode -> Bool # max :: IOMode -> IOMode -> IOMode # min :: IOMode -> IOMode -> IOMode #
Read IOMode
Instance details Defined in GHC.IO.IOMode Methods readsPrec :: Int -> ReadS IOMode # readList :: ReadS [IOMode] # readPrec :: ReadPrec IOMode # readListPrec :: ReadPrec [IOMode] #
Show IOMode
Instance details Defined in GHC.IO.IOMode Methods showsPrec :: Int -> IOMode -> ShowS # show :: IOMode -> String # showList :: [IOMode] -> ShowS #
Ix IOMode
Instance details Defined in GHC.IO.IOMode Methods range :: (IOMode, IOMode) -> [IOMode] # index :: (IOMode, IOMode) -> IOMode -> Int # unsafeIndex :: (IOMode, IOMode) -> IOMode -> Int inRange :: (IOMode, IOMode) -> IOMode -> Bool # rangeSize :: (IOMode, IOMode) -> Int # unsafeRangeSize :: (IOMode, IOMode) -> Int

data Handle #

Haskell defines operations to read and write characters from and to files, represented by values of type Handle. Each value of this type is a handle: a record used by the Haskell run-time system to manage I/O with file system objects. A handle has at least the following properties:

whether it manages input or output or both;
whether it is open, closed or semi-closed;
whether the object is seekable;
whether buffering is disabled, or enabled on a line or block basis;
a buffer (whose length may be zero).

Most handles will also have a current I/O position indicating where the next input or output operation will occur. A handle is readable if it manages only input or both input and output; likewise, it is writable if it manages only output or both input and output. A handle is open when first allocated. Once it is closed it can no longer be used for either input or output, though an implementation cannot re-use its storage while references remain to it. Handles are in the Show and Eq classes. The string produced by showing a handle is system dependent; it should include enough information to identify the handle for debugging. A handle is equal according to == only to itself; no attempt is made to compare the internal state of different handles for equality.

Instances

Eq Handle	Since: base-4.1.0.0
Instance details Defined in GHC.IO.Handle.Types Methods (==) :: Handle -> Handle -> Bool # (/=) :: Handle -> Handle -> Bool #
Show Handle	Since: base-4.1.0.0
Instance details Defined in GHC.IO.Handle.Types Methods showsPrec :: Int -> Handle -> ShowS # show :: Handle -> String # showList :: [Handle] -> ShowS #

stdin :: Handle #

A handle managing input from the Haskell program's standard input channel.

stdout :: Handle #

A handle managing output to the Haskell program's standard output channel.

stderr :: Handle #

A handle managing output to the Haskell program's standard error channel.

withFile :: MonadUnliftIO m => FilePath -> IOMode -> (Handle -> m a) -> m a Source #

Unlifted version of withFile.

Since: unliftio-0.1.0.0

withBinaryFile :: MonadUnliftIO m => FilePath -> IOMode -> (Handle -> m a) -> m a Source #

Unlifted version of withBinaryFile.

Since: unliftio-0.1.0.0

hClose :: MonadIO m => Handle -> m () Source #

Lifted version of hClose

Since: unliftio-0.2.1.0

hFlush :: MonadIO m => Handle -> m () Source #

Lifted version of hFlush

Since: unliftio-0.2.1.0

hFileSize :: MonadIO m => Handle -> m Integer Source #

Lifted version of hFileSize

Since: unliftio-0.2.1.0

hSetFileSize :: MonadIO m => Handle -> Integer -> m () Source #

Lifted version of hSetFileSize

Since: unliftio-0.2.1.0

hIsEOF :: MonadIO m => Handle -> m Bool Source #

Lifted version of hIsEOF

Since: unliftio-0.2.1.0

data BufferMode #

Three kinds of buffering are supported: line-buffering, block-buffering or no-buffering. These modes have the following effects. For output, items are written out, or flushed, from the internal buffer according to the buffer mode:

line-buffering: the entire output buffer is flushed whenever a newline is output, the buffer overflows, a hFlush is issued, or the handle is closed.
block-buffering: the entire buffer is written out whenever it overflows, a hFlush is issued, or the handle is closed.
no-buffering: output is written immediately, and never stored in the buffer.

An implementation is free to flush the buffer more frequently, but not less frequently, than specified above. The output buffer is emptied as soon as it has been written out.

Similarly, input occurs according to the buffer mode for the handle:

line-buffering: when the buffer for the handle is not empty, the next item is obtained from the buffer; otherwise, when the buffer is empty, characters up to and including the next newline character are read into the buffer. No characters are available until the newline character is available or the buffer is full.
block-buffering: when the buffer for the handle becomes empty, the next block of data is read into the buffer.
no-buffering: the next input item is read and returned. The hLookAhead operation implies that even a no-buffered handle may require a one-character buffer.

The default buffering mode when a handle is opened is implementation-dependent and may depend on the file system object which is attached to that handle. For most implementations, physical files will normally be block-buffered and terminals will normally be line-buffered.

Constructors

NoBuffering	buffering is disabled if possible.
LineBuffering	line-buffering should be enabled if possible.
BlockBuffering (Maybe Int)	block-buffering should be enabled if possible. The size of the buffer is `n` items if the argument is `Just` `n` and is otherwise implementation-dependent.

Instances

Eq BufferMode
Instance details Defined in GHC.IO.Handle.Types Methods (==) :: BufferMode -> BufferMode -> Bool # (/=) :: BufferMode -> BufferMode -> Bool #
Ord BufferMode
Instance details Defined in GHC.IO.Handle.Types Methods compare :: BufferMode -> BufferMode -> Ordering # (<) :: BufferMode -> BufferMode -> Bool # (<=) :: BufferMode -> BufferMode -> Bool # (>) :: BufferMode -> BufferMode -> Bool # (>=) :: BufferMode -> BufferMode -> Bool # max :: BufferMode -> BufferMode -> BufferMode # min :: BufferMode -> BufferMode -> BufferMode #
Read BufferMode
Instance details Defined in GHC.IO.Handle.Types Methods readsPrec :: Int -> ReadS BufferMode # readList :: ReadS [BufferMode] # readPrec :: ReadPrec BufferMode # readListPrec :: ReadPrec [BufferMode] #
Show BufferMode
Instance details Defined in GHC.IO.Handle.Types Methods showsPrec :: Int -> BufferMode -> ShowS # show :: BufferMode -> String # showList :: [BufferMode] -> ShowS #

hSetBuffering :: MonadIO m => Handle -> BufferMode -> m () Source #

Lifted version of hSetBuffering

Since: unliftio-0.2.1.0

hGetBuffering :: MonadIO m => Handle -> m BufferMode Source #

Lifted version of hGetBuffering

Since: unliftio-0.2.1.0

hSeek :: MonadIO m => Handle -> SeekMode -> Integer -> m () Source #

Lifted version of hSeek

Since: unliftio-0.2.1.0

data SeekMode #

A mode that determines the effect of hSeek hdl mode i.

Instances

Enum SeekMode
Instance details Defined in GHC.IO.Device Methods succ :: SeekMode -> SeekMode # pred :: SeekMode -> SeekMode # toEnum :: Int -> SeekMode # fromEnum :: SeekMode -> Int # enumFrom :: SeekMode -> [SeekMode] # enumFromThen :: SeekMode -> SeekMode -> [SeekMode] # enumFromTo :: SeekMode -> SeekMode -> [SeekMode] # enumFromThenTo :: SeekMode -> SeekMode -> SeekMode -> [SeekMode] #
Eq SeekMode
Instance details Defined in GHC.IO.Device Methods (==) :: SeekMode -> SeekMode -> Bool # (/=) :: SeekMode -> SeekMode -> Bool #
Ord SeekMode
Instance details Defined in GHC.IO.Device Methods compare :: SeekMode -> SeekMode -> Ordering # (<) :: SeekMode -> SeekMode -> Bool # (<=) :: SeekMode -> SeekMode -> Bool # (>) :: SeekMode -> SeekMode -> Bool # (>=) :: SeekMode -> SeekMode -> Bool # max :: SeekMode -> SeekMode -> SeekMode # min :: SeekMode -> SeekMode -> SeekMode #
Read SeekMode
Instance details Defined in GHC.IO.Device Methods readsPrec :: Int -> ReadS SeekMode # readList :: ReadS [SeekMode] # readPrec :: ReadPrec SeekMode # readListPrec :: ReadPrec [SeekMode] #
Show SeekMode
Instance details Defined in GHC.IO.Device Methods showsPrec :: Int -> SeekMode -> ShowS # show :: SeekMode -> String # showList :: [SeekMode] -> ShowS #
Ix SeekMode
Instance details Defined in GHC.IO.Device Methods range :: (SeekMode, SeekMode) -> [SeekMode] # index :: (SeekMode, SeekMode) -> SeekMode -> Int # unsafeIndex :: (SeekMode, SeekMode) -> SeekMode -> Int inRange :: (SeekMode, SeekMode) -> SeekMode -> Bool # rangeSize :: (SeekMode, SeekMode) -> Int # unsafeRangeSize :: (SeekMode, SeekMode) -> Int