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1 files changed, 0 insertions, 119 deletions

diff --git a/Touch.hsc b/Touch.hsc
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--- a/Touch.hsc
+++ /dev/null
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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(..),
-	touchBoth,
-	touch
-) where
-
-import Foreign
-import Foreign.C
-import Control.Monad (when)
-
-newtype TimeSpec = TimeSpec CTime
-
-{- Changes the access and modification times of an existing file.
-   Can follow symlinks, or not. Throws IO error on failure. -}
-touchBoth :: FilePath -> TimeSpec -> TimeSpec -> Bool -> IO ()
-
-touch :: FilePath -> TimeSpec -> Bool -> IO ()
-touch file mtime follow = touchBoth file mtime mtime follow
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <sys/time.h>
-
-#ifndef _BSD_SOURCE
-#define _BSD_SOURCE
-#endif
-
-#if (defined UTIME_OMIT && defined UTIME_NOW && defined AT_FDCWD && defined AT_SYMLINK_NOFOLLOW)
-
-at_fdcwd :: CInt
-at_fdcwd = #const AT_FDCWD
-
-at_symlink_nofollow :: CInt
-at_symlink_nofollow = #const AT_SYMLINK_NOFOLLOW
-
-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
-		return $ TimeSpec sec
-	poke ptr (TimeSpec sec) = do
-		#{poke struct timespec, tv_sec} ptr sec
-		#{poke struct timespec, tv_nsec} ptr (0 :: CLong)
-
-{- While its interface is beastly, utimensat is in recent
-   POSIX standards, unlike lutimes. -}
-foreign import ccall "utimensat" 
-	c_utimensat :: CInt -> CString -> Ptr TimeSpec -> CInt -> IO CInt
-
-touchBoth file atime mtime follow = 
-	allocaArray 2 $ \ptr ->
-	withCString file $ \f -> do
-		pokeArray ptr [atime, mtime]
-		r <- c_utimensat at_fdcwd f ptr flags
-		when (r /= 0) $ throwErrno "touchBoth"
-	where
-		flags = if follow
-			then 0
-			else at_symlink_nofollow 
-
-#else
-#if 0
-{- Using lutimes is needed for BSD.
- - 
- - TODO: test if lutimes is available. May have to do it in configure.
- - TODO: TimeSpec uses a CTime, while tv_sec is a CLong. It is implementation
- - dependent whether these are the same; need to find a cast that works.
- - (Without the cast it works on linux i386, but
- - maybe not elsewhere.)
- -}
-
-instance Storable TimeSpec where
-	alignment _ = alignment (undefined::CLong)
-	sizeOf _ = #{size struct timeval}
-	peek ptr = do
-		sec <- #{peek struct timeval, tv_sec} ptr
-		return $ TimeSpec sec
-	poke ptr (TimeSpec sec) = do
-		#{poke struct timeval, tv_sec} ptr sec
-		#{poke struct timeval, tv_usec} ptr (0 :: CLong) 
-
-foreign import ccall "utimes" 
-	c_utimes :: CString -> Ptr TimeSpec -> IO CInt
-foreign import ccall "lutimes" 
-	c_lutimes :: CString -> Ptr TimeSpec -> IO CInt
-
-touchBoth file atime mtime follow = 
-	allocaArray 2 $ \ptr ->
-	withCString file $ \f -> do
-		pokeArray ptr [atime, mtime]
-		r <- syscall f ptr
-		if (r /= 0)
-			then throwErrno "touchBoth"
-			else return ()
-	where
-		syscall = if follow
-			then c_lutimes
-			else c_utimes
-
-#else
-#warning "utimensat and lutimes not available; building without symlink timestamp preservation support"
-touchBoth _ _ _ _ = return ()
-#endif
-#endif