unix-2.7.2.2: POSIX functionality
Copyright (c) The University of Glasgow 2014
License BSD-style (see the file LICENSE)
Maintainer libraries@haskell.org
Stability provisional
Portability non-portable (requires POSIX)
Safe Haskell Safe
Language Haskell2010

System.Posix.Fcntl

Description

POSIX file control support

Since: 2.7.1.0

Synopsis

File allocation

data Advice Source #

Advice parameter for fileAdvise operation.

For more details, see documentation of posix_fadvise(2) .

Since: 2.7.1.0

Constructors

AdviceNormal
AdviceRandom
AdviceSequential
AdviceWillNeed
AdviceDontNeed
AdviceNoReuse

Instances

Instances details
Eq Advice Source #
Instance details

Defined in System.Posix.Fcntl

Methods

(==) :: Advice -> Advice -> Bool Source #

(/=) :: Advice -> Advice -> Bool Source #

fileAdvise :: Fd -> FileOffset -> FileOffset -> Advice -> IO () Source #

Performs posix_fadvise(2) operation on file-descriptor.

If platform does not provide posix_fadvise(2) fileAdvise becomes a no-op.

(use #if HAVE_POSIX_FADVISE CPP guard to detect availability)

Since: 2.7.1.0

fileAllocate :: Fd -> FileOffset -> FileOffset -> IO () Source #

Warning: operation will throw IOError "unsupported operation" (CPP guard: #if HAVE_POSIX_FALLOCATE )

Performs posix_fallocate(2) operation on file-descriptor.

Throws IOError ("unsupported operation") if platform does not provide posix_fallocate(2) .

(use #if HAVE_POSIX_FALLOCATE CPP guard to detect availability).

Since: 2.7.1.0