Move bytestring-mmap inside repo and add compatiblity layer

flake.lock

@@ -1,21 +1,5 @@
 {
   "nodes": {
-    "bytestring-mmap": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1727193872,
-        "narHash": "sha256-L39kMCMry/BNJngt0+yvSIMnJJzWR9ZoyXbEyniEfwU=",
-        "owner": "ivanovs-4",
-        "repo": "bytestring-mmap",
-        "rev": "f43e5e06718ed904487f17e7725c12098773c12f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "ivanovs-4",
-        "repo": "bytestring-mmap",
-        "type": "github"
-      }
-    },
     "db-pipe": {
       "inputs": {
         "haskell-flake-utils": [
@@ -294,7 +278,6 @@
     },
     "root": {
       "inputs": {
-        "bytestring-mmap": "bytestring-mmap",
         "db-pipe": "db-pipe",
         "flake-utils": "flake-utils",
         "fuzzy": "fuzzy",

flake.nix

@@ -38,11 +38,6 @@ inputs = {
       flake = false;
     };
 
-    bytestring-mmap = {
-      url = "github:ivanovs-4/bytestring-mmap";
-      flake = false;
-    };
-
 };
 
 outputs = { self, nixpkgs, flake-utils, ... }@inputs:
@@ -80,8 +75,7 @@ outputs = { self, nixpkgs, flake-utils, ... }@inputs:
 
       defaultOverlay = final: prev:
         (prev.lib.composeManyExtensions
-        [
-          overlay
+        [ overlay
           inputs.suckless-conf.overlays.default
           inputs.db-pipe.overlays.default
         ]) final prev;
@@ -117,7 +111,7 @@ outputs = { self, nixpkgs, flake-utils, ... }@inputs:
         overrides = new: old: with pkgs.haskell.lib;
           {
             scotty = new.callHackage "scotty" "0.21" {};
-            bytestring-mmap = jailbreakUnbreak old.bytestring-mmap; # old.callCabal2nix "bytestring-mmap" inputs.bytestring-mmap {};
+            bytestring-mmap = old.callCabal2nix "bytestring-mmap" "${self}/miscellaneous/bytestring-mmap" {};
             skylighting-lucid = new.callHackage "skylighting-lucid" "1.0.4" { };
             wai-app-file-cgi = dontCoverage (dontCheck (jailbreakUnbreak old.wai-app-file-cgi));
             saltine = old.callCabal2nix "saltine" inputs.saltine { inherit (pkgs) libsodium; };
@@ -134,13 +128,11 @@ outputs = { self, nixpkgs, flake-utils, ... }@inputs:
         (_name: packagePostOverrides) # we can't apply overrides inside our overlay because it will remove linking info
         (pkgs.lib.getAttrs packageNames pkgs.haskellPackages);
 
-    # dynamic packages don't work at the moment, because
-    # ivanovs-4/bytestring-mmap doesn't compile with ghc 9.4
-    # and bytestring-mmap doesn't compire with ghc > 9.6
     packagesDynamic = makePackages pkgs;
     packagesStatic = makePackages pkgs.pkgsStatic;
     in  {
     legacyPackages = pkgs;
+    overlays.default = defaultOverlay;
 
     packages =
       packagesDynamic //
@@ -157,7 +149,7 @@ outputs = { self, nixpkgs, flake-utils, ... }@inputs:
         };
       };
 
-    devShell.default = pkgs.haskellPackages.shellFor {
+    devShells.default = pkgs.haskellPackages.shellFor {
       packages = _: pkgs.lib.attrsets.attrVals packageNames pkgs.haskellPackages;
       # withHoogle = true;
       buildInputs = (

miscellaneous/bytestring-mmap/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) Don Stewart
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the author nor the names of his contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.

miscellaneous/bytestring-mmap/README.md

@@ -0,0 +1,2 @@
+Fork of https://hackage.haskell.org/package/bytestring-mmap since original repo
+is not available at http://code.haskell.org/~dons/code/bytestring-mmap/

miscellaneous/bytestring-mmap/Setup.lhs

@@ -0,0 +1,3 @@
+#!/usr/bin/env runhaskell
+> import Distribution.Simple
+> main = defaultMain

miscellaneous/bytestring-mmap/System/IO/Posix/MMap.hs

@@ -0,0 +1,114 @@
+{-# LANGUAGE ForeignFunctionInterface #-}
+--------------------------------------------------------------------
+-- |
+-- Module    :  System.IO.Posix.MMap
+-- Copyright :  (c) Galois, Inc. 2007
+-- License   :  BSD3
+--
+-- Maintainer:  Don Stewart <dons@galois.com>
+-- Stability :  provisional
+-- Portability: non-portable -- posix only
+--
+-- mmap a file or device into memory as a strict ByteString.
+--
+module System.IO.Posix.MMap (
+
+      -- $mmap_intro
+      -- $mmap_unmap
+
+      -- * Memory mapped files
+      unsafeMMapFile -- :: FilePath -> IO ByteString
+
+-- $mmap_intro
+--
+-- 'unsafeMMapFile' mmaps a file or device into memory as a strict
+-- 'ByteString'. The file is not actually copied strictly into memory,
+-- but instead pages from the file will be loaded into the address
+-- space on demand.
+--
+-- We can consider mmap as lazy IO pushed into the virtual memory
+-- subsystem.
+--
+-- The file is mapped using MAP_SHARED: modifications to the file
+-- will be immediately shared with any other process accessing the
+-- file. This has no effect from the Haskell point of view, since
+-- ByteStrings are treated as immutable values.
+--
+-- However, if the file is written to by any other process on the
+-- system while it is in use in Haskell, those changes will be
+-- immediately reflected on the Haskell side, destroying referential
+-- transparency.
+--
+-- It is only safe to mmap a file if you know you are the sole user.
+--
+-- For more details about mmap, and its consequences, see:
+-- 
+-- * <http://opengroup.org/onlinepubs/009695399/functions/mmap.html>
+--
+-- * <http://www.gnu.org/software/libc/manual/html_node/Memory_002dmapped-I_002fO.html>
+--
+
+-- $mmap_unmap
+--
+-- When the entire file is out of scope, the Haskell storage manager
+-- will call munmap to free the file, using a finaliser. Until then, as
+-- much of the file as you access will be allocated.
+--
+-- Note that the Haskell storage manager doesn't know how large a
+-- resource is associated with an mmapped file. If you allocate many
+-- such files, the garbage collector will only see the 'ForeignPtr's
+-- that have been allocated, not the corresponding ByteArrays. The
+-- result will be that the GC runs less often that you hoped, as it 
+-- looks like only a few bytes have been allocated on the Haskell heap.
+-- 
+-- Use of 'performGC' or 'finalizeForeignPtr' when you know that
+-- the object is going out of scope can ensure that resources are
+-- released appropriately.
+--
+
+    ) where
+
+import System.IO.Posix.MMap.Internal
+
+-- import System.IO
+-- import qualified System.IO as IO
+import Foreign.Ptr
+
+import Control.Exception
+import Data.ByteString
+
+import System.Posix hiding (openFd)
+import System.Posix.IO.Compat (openFd)
+
+-- | The 'unsafeMMapFile' function maps a file or device into memory,
+-- returning a strict 'ByteString' that accesses the mapped file.
+-- If the mmap fails for some reason, an error is thrown.
+--
+-- Memory mapped files will behave as if they were read lazily -- 
+-- pages from the file will be loaded into memory on demand.
+--
+-- The storage manager is used to free the mapped memory. When
+-- the garbage collector notices there are no further references to the 
+-- mapped memory, a call to munmap is made. It is not necessary to do
+-- this yourself. In tight memory situations, it may be profitable to
+-- use 'performGC' or 'finalizeForeignPtr' to force an unmap.
+--
+-- Note: this operation may break referential transparency! If 
+-- any other process on the system changes the file when it is mapped
+-- into Haskell, the contents of your 'ByteString' will change.
+--
+unsafeMMapFile :: FilePath -> IO ByteString
+unsafeMMapFile f = do
+    fd   <- openFd f ReadOnly defaultFileFlags
+    always (closeFd fd) $ do
+        stat <- getFdStatus fd
+        let size = fromIntegral (fileSize stat)
+        if size <= 0
+            then return empty -- BSD mmap won't accept a length of zero
+            else do
+        ptr <- c_mmap size (fromIntegral fd)
+        if ptr == nullPtr
+            then error "System.IO.Posix.MMap.mmapFile: unable to mmap file"
+            else unsafePackMMapPtr ptr size
+
+  where always = flip finally

miscellaneous/bytestring-mmap/System/IO/Posix/MMap/Internal.hs

@@ -0,0 +1,54 @@
+{-# LANGUAGE ForeignFunctionInterface #-}
+--------------------------------------------------------------------
+-- |
+-- Module    :  System.IO.Posix.MMap.Internal
+-- Copyright :  (c) Galois, Inc. 2007
+-- License   :  BSD3
+--
+-- Maintainer:  Don Stewart <dons@galois.com>
+-- Stability :  provisional
+-- Portability: non-portable -- posix only
+--
+-- Low level mmap access.
+--
+module System.IO.Posix.MMap.Internal (
+
+    -- * Converting an mmapped pointer to a 'ByteString'
+    unsafePackMMapPtr,      -- :: Ptr Word8 -> CSize -> IO ByteString
+
+    -- * Low level bindings
+    c_mmap,                 -- :: CSize -> CInt -> IO (Ptr Word8)
+    c_munmap                -- :: Ptr Word8 -> CSize -> IO CInt
+
+  ) where
+
+import System.IO
+import qualified System.IO as IO
+import Foreign.C.Types
+import Foreign.Ptr
+import qualified Foreign.Concurrent as FC
+
+import Control.Monad
+import Data.Word
+import Data.ByteString.Internal
+-- import Data.ByteString
+
+-- | Create a bytestring from a memory mapped Ptr.
+-- A finalizer will be associated with the resource, that will call
+-- munmap when the storage manager detects that the resource is no longer
+-- in use.
+unsafePackMMapPtr :: Ptr Word8 -> CSize -> IO ByteString
+unsafePackMMapPtr p s = do
+    fp <- FC.newForeignPtr p $ do
+                 v <- c_munmap p s
+                 when (v == -1) $ IO.hPutStrLn stderr $
+                         "System.IO.Posix.MMap: warning, failed to unmap "
+                          ++ show s ++" bytes at "++show p
+    return (fromForeignPtr fp 0 (fromIntegral s))
+{-# INLINE unsafePackMMapPtr #-}
+
+foreign import ccall unsafe "hs_bytestring_mmap.h hs_bytestring_mmap"
+    c_mmap   :: CSize -> CInt -> IO (Ptr Word8)
+
+foreign import ccall unsafe "hs_bytestring_mmap.h munmap"
+    c_munmap :: Ptr Word8 -> CSize -> IO CInt

miscellaneous/bytestring-mmap/System/IO/Posix/MMap/Lazy.hs

@@ -0,0 +1,130 @@
+{-# LANGUAGE CPP, BangPatterns, ForeignFunctionInterface #-}
+--------------------------------------------------------------------
+-- |
+-- Module    :  System.IO.Posix.MMap
+-- Copyright :  (c) Galois, Inc. 2007
+-- License   :  BSD3
+--
+-- Maintainer:  Don Stewart <dons@galois.com>
+-- Stability :  provisional
+-- Portability: non-portable -- posix only
+--
+-- Lazy, chunk-wise memory mapping.
+--
+-- Memory map a file as a lazy ByteString. Finalisers are associated
+-- cached-sized portions of the file, which will be deallocated as
+-- those chunks go out of scope.
+--
+-- Unlike strict Bytestrings, mmapFile for Lazy ByteStrings will
+-- deallocate chunks of the file.
+--
+-- The storage manager is used to free chunks of the mapped memory. When
+-- the garbage collector notices there are no further references to 
+-- a chunk, a call to munmap is made.
+--
+-- In effect, the file is mmapped once, lazily, then covered with finalizers
+-- for each chunk. When any chunk goes out of scope, that part is
+-- deallocated. We must allocate the spine of the structure strictly
+-- though, to ensure finalizers are registered for the entire file.
+--
+-- The Haskell garbage collector decides when to run based on heap
+-- pressure, however the mmap stores memory outside the Haskell heap, 
+-- so those resources are not counted when deciding to run the garbage
+-- collect. The result is that finalizers run less often than you might
+-- expect, and it is possible to write a lazy bytestring mmap program 
+-- that never deallocates (and thus doesn't run in constant space).
+-- 'performGC' or 'finalizerForeignPtr' can be used to trigger collection
+-- at sensible points.
+--
+-- Note: this operation may break referential transparency! If 
+-- any other process on the system changes the file when it is mapped
+-- into Haskell, the contents of your 'ByteString' will change.
+--
+module System.IO.Posix.MMap.Lazy (
+
+      unsafeMMapFile -- :: FilePath -> IO ByteString
+
+    ) where
+
+import System.IO.Posix.MMap.Internal
+
+-- import System.IO
+import Foreign.C.Types
+import Foreign.Ptr
+-- import Control.Monad
+
+import Control.Exception
+import Data.Word
+import Data.ByteString.Lazy.Internal
+
+import System.Posix hiding (openFd)
+import System.Posix.IO.Compat (openFd)
+
+--
+-- | The 'unsafeMMapFile' function maps a file or device into memory as
+-- a lazy ByteString, made of 64*pagesize unmappable chunks of bytes.
+--
+-- Memory mapped files will behave as if they were read lazily -- 
+-- pages from the file will be loaded into memory on demand.
+-- 
+-- The storage manager is used to free chunks that go out of scope,
+-- and unlike strict bytestrings, memory mapped lazy ByteStrings will
+-- be deallocated in chunks (so you can write traversals that run in
+-- constant space).
+--
+-- However, the size of the mmapped resource is not known by the Haskell
+-- GC, it appears only as a small ForeignPtr. This means that the
+-- Haskell GC may not not run as often as you'd like, leading to delays
+-- in unmapping chunks.
+-- 
+-- Appropriate use of performGC or finalizerForeignPtr may be required
+-- to ensure deallocation, as resources allocated by mmap are not
+-- tracked by the Haskell garbage collector.
+--
+-- For example, when writing out a lazy bytestring allocated with mmap,
+-- you may wish to finalizeForeignPtr when each chunk is written, as the 
+-- chunk goes out of scope, rather than relying on the garbage collector
+-- to notice the chunk has gone.
+--
+-- This operation is unsafe: if the file is written to by any other
+-- process on the system, the 'ByteString' contents will change in
+-- Haskell.
+--
+unsafeMMapFile :: FilePath -> IO ByteString
+unsafeMMapFile path = do
+    fd   <- openFd path ReadOnly defaultFileFlags
+    always (closeFd fd) $ do
+        stat <- getFdStatus fd
+        let size = fromIntegral (fileSize stat)
+        ptr  <- c_mmap size (fromIntegral fd)
+        if ptr == nullPtr
+          then error "System.IO.Posix.MMap.Lazy: unable to mmap file!"
+          else chunks chunk_size ptr (fromIntegral size)
+  where
+    always = flip finally
+
+    -- must be page aligned.
+    chunk_size = 64 * fromIntegral pagesize -- empircally derived
+
+--
+-- Break the file up into chunks.
+    -- Have separate munmap finalizers for each chunk.
+--
+chunks :: CSize -> Ptr Word8 -> CSize -> IO ByteString
+chunks chunk_size p bytes = loop p bytes
+#ifndef __HADDOCK__
+  where
+    loop !ptr !rest
+          | rest <= 0 = return Empty
+          | otherwise = let s     = min chunk_size rest
+                            ptr'  = ptr `plusPtr` fromIntegral s
+                            rest' = rest - s
+                        in do c  <- unsafePackMMapPtr ptr s
+                              cs <- loop ptr' rest' -- need to be strict
+                              return (chunk c cs)   -- to ensure we cover the whole file
+                                                    -- with finalizers
+#endif
+
+foreign import ccall unsafe "unistd.h getpagesize"
+    pagesize :: CInt
+

miscellaneous/bytestring-mmap/System/Posix/IO/Compat.hs

@@ -0,0 +1,12 @@
+{-# LANGUAGE CPP #-}
+module System.Posix.IO.Compat where
+
+import qualified System.Posix as Unix
+
+
+openFd :: FilePath -> Unix.OpenMode -> Unix.OpenFileFlags -> IO Unix.Fd
+#if MIN_VERSION_unix(2,8,0)
+openFd = Unix.openFd
+#else
+openFd file openMode = Unix.openFd file openMode Nothing
+#endif

miscellaneous/bytestring-mmap/bytestring-mmap.cabal

@@ -0,0 +1,42 @@
+name:                bytestring-mmap
+version:             0.2.3
+synopsis:            mmap support for strict ByteStrings
+description:
+    .
+    This library provides a wrapper to mmap(2), allowing files or
+    devices to be lazily loaded into memory as strict or lazy
+    ByteStrings, using the virtual memory subsystem to do on-demand
+    loading.
+    .
+category:            System
+homepage:            http://code.haskell.org/~dons/code/bytestring-mmap/
+license:             BSD3
+license-file:        LICENSE
+author:              Don Stewart
+maintainer:          Don Stewart <dons00@gmail.com>
+build-type:          Simple
+cabal-version:      >= 1.2
+
+flag split-base
+  description: Choose the new smaller, split-up base package.
+
+library
+  build-depends: unix
+  if flag(split-base)
+    build-depends:     base >= 3 && < 6, bytestring >= 0.9
+  else
+    build-depends:     base < 3
+  extensions:        CPP, ForeignFunctionInterface, BangPatterns
+
+  exposed-modules:   System.IO.Posix.MMap
+                     System.IO.Posix.MMap.Lazy
+                     System.IO.Posix.MMap.Internal
+
+  other-modules: System.Posix.IO.Compat
+
+  ghc-options:       -Wall -O2
+
+  c-sources:         cbits/hs_bytestring_mmap.c
+  include-dirs:      include
+  includes:          hs_bytestring_mmap.h
+  install-includes:  hs_bytestring_mmap.h

miscellaneous/bytestring-mmap/cbits/hs_bytestring_mmap.c

@@ -0,0 +1,22 @@
+/*
+ * hs_bytestring_mmap.c
+ *
+ * License   : BSD3
+ *
+ * Copyright (C) 2003   David Roundy
+ *               2005-7 Don Stewart
+ *
+ * Maintainer: Don Stewart <dons@galois.com>
+ */
+#include "hs_bytestring_mmap.h"
+
+/* 
+ * mmap len bytes from fd into memory, read only.
+ */
+unsigned char *hs_bytestring_mmap(size_t len, int fd) {
+      void *result = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0);
+      if (result == MAP_FAILED)
+            return (unsigned char *)0;
+      else
+            return (unsigned char *)result;
+}

miscellaneous/bytestring-mmap/include/hs_bytestring_mmap.h

@@ -0,0 +1,15 @@
+/*
+ * hs_bytestring_mmap.h
+ *
+ * License   : BSD3
+ *
+ * Copyright (C) 2003   David Roundy
+ *               2005-7 Don Stewart
+ *
+ * Maintainer: Don Stewart <dons@galois.com>
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+
+unsigned char *hs_bytestring_mmap(size_t len, int fd);

miscellaneous/bytestring-mmap/tests/big-lazy.hs

@@ -0,0 +1,22 @@
+import qualified Data.ByteString.Lazy as L
+import System.IO.Posix.MMap.Lazy
+import Control.Monad
+import Text.Printf
+import System.Mem
+
+main = do
+      s <- unsafeMMapFile "/usr/obj/data/1G"
+      go 0 s
+   where
+      go n s
+        | L.null s = return ()
+        | otherwise
+          = do -- printf "%d\n" 
+               L.head s `seq` return ()
+               when (n `mod` 1000 == 0) $ do
+                    performGC -- tune this value for when to run the GC
+               go (n+1) (L.drop 4096 s)
+
+
+--    forM_ [0, (1024) .. L.length s-1] $ \n -> do
+

miscellaneous/bytestring-mmap/tests/big.hs

@@ -0,0 +1,12 @@
+import qualified Data.ByteString as S
+import System.IO.Posix.MMap
+import Control.Monad
+import Text.Printf
+
+main = do
+      s <- unsafeMMapFile "/usr/obj/data/1G"
+      print "This program should touch only 1 page per 100k"
+
+      forM_ [0, (1024) .. S.length s-1] $ \n -> do
+          printf "n=%d := %d\n" n (S.index s n)
+

miscellaneous/bytestring-mmap/tests/cp.hs

@@ -0,0 +1,37 @@
+-- A non-copying cp based on mmap.
+
+import System.IO.Posix.MMap
+import qualified Data.ByteString as S
+
+import Text.Printf
+import Control.Exception
+import System.CPUTime
+import System.Cmd
+import System.Directory
+
+import System.Environment
+
+time :: IO t -> IO t
+time a = do
+    start <- getCPUTime
+    v <- a
+    v `seq` return ()
+    end   <- getCPUTime
+    let diff = (fromIntegral (end - start)) / (10^12)
+    printf "Computation time: %0.3f sec\n" (diff :: Double)
+    return v
+
+main = do
+    [f] <- getArgs
+
+    putStrLn "mmap copy"
+    time $ S.writeFile "file-1" =<< unsafeMMapFile   f
+    putChar '\n'
+
+    putStrLn "lazy copy"
+    time $ S.writeFile "file-2" =<< S.readFile f
+    putChar '\n'
+
+    system $ "diff " ++ "file-1 " ++ "file-2"
+    removeFile "file-1"
+    removeFile "file-2"

miscellaneous/bytestring-mmap/tests/fast-cp.hs

@@ -0,0 +1,29 @@
+import qualified System.IO.Posix.MMap.Lazy     as L
+import qualified Data.ByteString.Lazy          as L
+import qualified Data.ByteString.Lazy.Internal as L
+import qualified Data.ByteString.Internal      as S
+import qualified Data.ByteString               as S
+
+import Foreign.ForeignPtr
+import System.Environment
+import System.IO
+import Control.Exception
+
+main = do
+    [f,g] <- getArgs
+    writeFile' g =<< L.unsafeMMapFile f
+
+--
+-- An implementation of writeFile for bytestrings that 
+-- that finalises chunks as they go out the door.
+--
+writeFile' :: FilePath -> L.ByteString -> IO ()
+writeFile' f txt = bracket (openBinaryFile f WriteMode) hClose (\hdl -> hPut hdl txt)
+
+hPut :: Handle -> L.ByteString -> IO ()
+hPut h cs = L.foldrChunks (\chunk rest -> do S.hPut h chunk
+                                             unmap chunk
+                                             rest)
+                          (return ()) cs
+
+    where unmap c = finalizeForeignPtr fp where (fp,_,_) = S.toForeignPtr c

miscellaneous/bytestring-mmap/tests/files.hs

@@ -0,0 +1,46 @@
+import qualified Data.ByteString      as S
+import qualified Data.ByteString.Lazy as L
+import System.IO.Posix.MMap
+import qualified System.IO.Posix.MMap.Lazy as LM
+
+import System.Directory
+import System.Posix.Files
+import System.IO
+import System.FilePath
+import Control.Monad
+import Control.Applicative
+import Text.Printf
+import System.Cmd
+import System.Exit
+import System.Mem
+import Control.Exception
+
+main = do
+    print "Testing Lazy.mmap == Strict.mmap == Strict.ByteString.readFile"
+    system "find /home/dons/ghc/ -type f > files_to_read"
+    always (removeFile "files_to_read") $ do
+        fs <- lines <$> readFile "files_to_read"
+
+    {-
+        ss <- getDirectoryContents dir
+        fs <- filterM (\f -> do st <- getFileStatus (dir </> f)
+                                return (not $ isDirectory st)) ss
+    -}
+
+        printf "Comparing %d files\n" (length fs)
+        forM_ (zip [1..] fs) $ \(i,f) -> do
+                t <- eq f
+                if t
+                   then when (i `mod` 1000 == 0) $ putStr "Ok. " >> hFlush stdout
+                   else exitWith (ExitFailure 1)
+
+        print "All good."
+
+  where 
+    always = flip finally
+
+eq f = do
+        m  <-    unsafeMMapFile f
+        lm <- LM.unsafeMMapFile f
+        s  <- S.readFile f
+        return (m == s && L.fromChunks [m] == lm)

miscellaneous/bytestring-mmap/tests/pressure.hs

@@ -0,0 +1,32 @@
+-- A non-copying cp based on mmap.
+
+import System.IO.Posix.MMap
+import Control.Monad
+import System.Mem
+import qualified Data.ByteString as S
+import Text.Printf
+import Control.Exception
+import System.CPUTime
+
+main = do
+
+    --should run in constant space, and be faster:
+    time $ forM_ [0..1000] $ \_ -> do
+        unsafeMMapFile "/usr/share/dict/words"
+
+    putStrLn "\nShould be faster than:\n"
+
+    --should run in constant space:
+    time $ forM_ [0..1000] $ \_ -> do
+        S.readFile "/usr/share/dict/words"
+
+
+time :: IO t -> IO t
+time a = do
+    start <- getCPUTime
+    v <- a
+    v `seq` return ()
+    end   <- getCPUTime
+    let diff = (fromIntegral (end - start)) / (10^12)
+    printf "Computation time: %0.3f sec\n" (diff :: Double)
+    return v

miscellaneous/bytestring-mmap/tests/small.hs

@@ -0,0 +1,15 @@
+import System.Directory
+import System.IO.Posix.MMap
+import System.Posix.Files
+import System.FilePath
+import Control.Monad
+import Control.Applicative
+
+main = do
+--  let dir = "/home/dons/lambdabot/_darcs/patches"
+--  ss <- getDirectoryContents dir
+--  fs <- filterM (\f -> do st <- getFileStatus (dir </> f)
+--                          return (not $ isDirectory st)) ss
+
+    fs <- lines <$> readFile "/tmp/files"
+    mapM_ unsafeMMapFile fs

miscellaneous/bytestring-mmap/tests/test

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -e
+
+compile="ghc -no-recomp -O --make "
+
+$compile files.hs && ./files
+rm files
+
+$compile cp.hs    && ./cp /usr/share/dict/cracklib-small ./words
+rm cp
+
+$compile pressure.hs    && ./pressure
+
+#big-lazy.hs
+#big.hs
+#fast-cp.hs
+#pressure.hs
+#small.hs