Copyright	(c) The University of Glasgow 2017
License	see libraries/base/LICENSE
Maintainer	[email protected]
Stability	internal
Portability	non-portable
Safe Haskell	Safe
Language	Haskell2010

stdin :: Handle Source

stdin is a handle managing the programs standard input.

stdout :: Handle Source

stdout is a handle managing the programs standard output.

stderr :: Handle Source

stderr is a handle managing the programs standard error.

openFile Source

The computation openFile path mode returns a file handle that can be used to interact with the file.

The handle is open in text mode with localeEncoding. You can change the encoding with hSetEncoding.

openBinaryFile Source

The computation openBinaryFile path mode returns a file handle that can be used to interact with the binary file.

This is different from openFile as in that it does not use any file encoding.

openFileBlocking :: FilePath -> IOMode -> IO Handle Source

withFile Source

The computation withFile path mode action opens the file and runs action with the obtained handle before closing the file.

Even when an exception is raised within the action, the file will still be closed. This is why withFile path mode act is preferable to

openFile path mode >>= (\hdl -> act hdl >>= hClose hdl)

See also: bracket

withBinaryFile :: FilePath -> IOMode -> (Handle -> IO r) -> IO r Source

The computation withBinaryFile path mode action opens the binary file and runs action with the obtained handle before closing the binary file.

This is different from withFile as in that it does not use any file encoding.

Even when an exception is raised within the action, the file will still be closed. This is why withBinaryFile path mode act is preferable to

openBinaryFile path mode >>= (\hdl -> act hdl >>= hClose hdl)

See also: bracket

withFileBlocking :: FilePath -> IOMode -> (Handle -> IO r) -> IO r Source