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|
{- More control over touching a file.
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE ForeignFunctionInterface #-}
module Touch (
TimeSpec(..),
now,
omit,
touchBoth,
touch
) where
import Foreign
import Foreign.C
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
data TimeSpec = TimeSpec CTime CLong
instance Storable TimeSpec where
-- use the larger alignment of the two types in the struct
alignment _ = max sec_alignment nsec_alignment
where
sec_alignment = alignment $ undefined::CTime
nsec_alignment = alignment $ undefined::CLong
sizeOf _ = #{size struct timespec}
peek ptr = do
sec <- #{peek struct timespec, tv_sec} ptr
nsec <- #{peek struct timespec, tv_nsec} ptr
return $ TimeSpec sec nsec
poke ptr (TimeSpec sec nsec) = do
#{poke struct timespec, tv_sec} ptr sec
#{poke struct timespec, tv_nsec} ptr nsec
{- special timespecs -}
omit :: TimeSpec
omit = TimeSpec 0 #const UTIME_OMIT
now :: TimeSpec
now = TimeSpec 0 #const UTIME_NOW
{- While its interface is beastly, utimensat is in recent
POSIX standards, unlike futimes. -}
foreign import ccall "utimensat"
c_utimensat :: CInt -> CString -> Ptr TimeSpec -> CInt -> IO CInt
{- Changes the access and/or modification times of a file.
Can follow symlinks, or not. -}
touchBoth :: FilePath -> TimeSpec -> TimeSpec -> Bool -> IO Bool
touchBoth file atime mtime follow =
allocaArray 2 $ \ptr ->
withCString file $ \f -> do
pokeArray ptr [atime, mtime]
r <- c_utimensat at_fdcwd f ptr flags
return (r == 0)
where
at_fdcwd = #const AT_FDCWD
at_symlink_nofollow = #const AT_SYMLINK_NOFOLLOW
flags = if follow
then 0
else at_symlink_nofollow
touch :: FilePath -> TimeSpec -> Bool -> IO Bool
touch file mtime follow = touchBoth file omit mtime follow
|
