System.FS.IO.Handle

This module is mainly meant to be used for the IO implementation of HasFS.

Documentation

data HandleOS osHandle

File handlers for the IO instance for HasFS. This is parametric on the os.

The FilePath is used to improve error messages. The MVar is used to implement close. osHandle is Fd for unix and HANDLE for Windows.

Constructors

HandleOS

Fields

• filePath :: FilePath
• handle :: MVar (Maybe osHandle)

Instances

Show (HandleOS a)

Defined in System.FS.IO.Handle

Methods

showsPrec :: Int -> HandleOS a -> ShowS

show :: HandleOS a -> String

showList :: [HandleOS a] -> ShowS

Eq (HandleOS a)

Defined in System.FS.IO.Handle

Methods

(==) :: HandleOS a -> HandleOS a -> Bool

(/=) :: HandleOS a -> HandleOS a -> Bool

closeHandleOS :: HandleOS osHandle -> (osHandle -> IO ()) -> IO ()

This is a no-op when the handle is already closed.

isHandleClosedException :: IOException -> Bool

isOpenHandleOS :: HandleOS osHandle -> IO Bool

withOpenHandle :: String -> HandleOS osHandle -> (osHandle -> IO a) -> IO a

This is meant to be used for the implementation of individual file system commands. Using it for larger scopes woud not be correct, since we would not notice if the handle is closed.