    {-# INCLUDE <windows.h> #-}
    {-# INCLUDE <tlhelp32.h> #-}
    {-# LINE 1 "System\Win32\Process.hsc" #-}
    -----------------------------------------------------------------------------
    {-# LINE 2 "System\Win32\Process.hsc" #-}
    -- |
    -- Module      :  System.Win32.Process
    -- Copyright   :  (c) Alastair Reid, 1997-2003
    -- License     :  BSD-style (see the file libraries/base/LICENSE)
    --
    -- Maintainer  :  Esa Ilari Vuokko <ei@vuokko.info>
    -- Stability   :  provisional
    -- Portability :  portable
    --
    -- A collection of FFI declarations for interfacing with Win32.
    --
    -----------------------------------------------------------------------------

    module System.Win32.Process where
    import Control.Exception    ( bracket )
    import Control.Monad        ( liftM5 )
    import Foreign              ( Ptr, peekByteOff, allocaBytes, pokeByteOff
                                , plusPtr )
    import System.Win32.File    ( closeHandle )
    import System.Win32.Types

    {-# LINE 24 "System\Win32\Process.hsc" #-}

    {-# LINE 25 "System\Win32\Process.hsc" #-}

    -- constant to wait for a very long time.
    iNFINITE :: DWORD
    iNFINITE = 4294967295
    {-# LINE 29 "System\Win32\Process.hsc" #-}

    foreign import stdcall unsafe "windows.h Sleep"
      sleep :: DWORD -> IO ()

    type ProcessId = DWORD
    type ProcessHandle = HANDLE
    type ProcessAccessRights = DWORD
    pROCESS_ALL_ACCESS             :: ProcessAccessRights
    pROCESS_ALL_ACCESS             =  2035711
    pROCESS_CREATE_PROCESS         :: ProcessAccessRights
    pROCESS_CREATE_PROCESS         =  128
    pROCESS_CREATE_THREAD          :: ProcessAccessRights
    pROCESS_CREATE_THREAD          =  2
    pROCESS_DUP_HANDLE             :: ProcessAccessRights
    pROCESS_DUP_HANDLE             =  64
    pROCESS_QUERY_INFORMATION      :: ProcessAccessRights
    pROCESS_QUERY_INFORMATION      =  1024
    pROCESS_SET_QUOTA              :: ProcessAccessRights
    pROCESS_SET_QUOTA              =  256
    pROCESS_SET_INFORMATION        :: ProcessAccessRights
    pROCESS_SET_INFORMATION        =  512
    pROCESS_TERMINATE              :: ProcessAccessRights
    pROCESS_TERMINATE              =  1
    pROCESS_VM_OPERATION           :: ProcessAccessRights
    pROCESS_VM_OPERATION           =  8
    pROCESS_VM_READ                :: ProcessAccessRights
    pROCESS_VM_READ                =  16
    pROCESS_VM_WRITE               :: ProcessAccessRights
    pROCESS_VM_WRITE               =  32
    sYNCHORNIZE                    :: ProcessAccessRights
    sYNCHORNIZE                    =  1048576

    {-# LINE 51 "System\Win32\Process.hsc" #-}

    foreign import stdcall unsafe "windows.h OpenProcess"
        c_OpenProcess :: ProcessAccessRights -> BOOL -> ProcessId -> IO ProcessHandle

    openProcess :: ProcessAccessRights -> BOOL -> ProcessId -> IO ProcessHandle
    openProcess r inh i = failIfNull "OpenProcess" $ c_OpenProcess r inh i

    type Th32SnapHandle = HANDLE
    type Th32SnapFlags = DWORD
    -- | ProcessId, number of threads, parent ProcessId, process base priority, path of executable file
    type ProcessEntry32 = (ProcessId, Int, ProcessId, LONG, String)

    tH32CS_SNAPALL         :: Th32SnapFlags
    tH32CS_SNAPALL         =  15
    tH32CS_SNAPHEAPLIST    :: Th32SnapFlags
    tH32CS_SNAPHEAPLIST    =  1
    tH32CS_SNAPMODULE      :: Th32SnapFlags
    tH32CS_SNAPMODULE      =  8
    tH32CS_SNAPPROCESS     :: Th32SnapFlags
    tH32CS_SNAPPROCESS     =  2
    tH32CS_SNAPTHREAD      :: Th32SnapFlags
    tH32CS_SNAPTHREAD      =  4

    {-# LINE 71 "System\Win32\Process.hsc" #-}
    {-
        , tH32CS_SNAPGETALLMODS = TH32CS_GETALLMODS
        , tH32CS_SNAPNOHEAPS    = TH32CS_SNAPNOHEAPS
    -}

    foreign import stdcall unsafe "tlhelp32.h CreateToolhelp32Snapshot"
        c_CreateToolhelp32Snapshot :: Th32SnapFlags -> ProcessId -> IO Th32SnapHandle

    foreign import stdcall unsafe "tlhelp32.h Process32FirstW"
        c_Process32First :: Th32SnapHandle -> Ptr ProcessEntry32 -> IO BOOL

    foreign import stdcall unsafe "tlhelp32.h Process32NextW"
        c_Process32Next :: Th32SnapHandle -> Ptr ProcessEntry32 -> IO BOOL

    -- | Create a snapshot of specified resources.  Call closeHandle to close snapshot.
    createToolhelp32Snapshot :: Th32SnapFlags -> Maybe ProcessId -> IO Th32SnapHandle
    createToolhelp32Snapshot f p
        = failIfNull "CreateToolhelp32Snapshot" $ c_CreateToolhelp32Snapshot
            f (maybe 0 id p)

    withTh32Snap :: Th32SnapFlags -> Maybe ProcessId -> (Th32SnapHandle -> IO a) -> IO a
    withTh32Snap f p = bracket (createToolhelp32Snapshot f p) (closeHandle)

    peekProcessEntry32 :: Ptr ProcessEntry32 -> IO ProcessEntry32
    peekProcessEntry32 buf = liftM5 (,,,,)
        (((\hsc_ptr -> peekByteOff hsc_ptr 8)) buf)
    {-# LINE 98 "System\Win32\Process.hsc" #-}
        (((\hsc_ptr -> peekByteOff hsc_ptr 20)) buf)
    {-# LINE 99 "System\Win32\Process.hsc" #-}
        (((\hsc_ptr -> peekByteOff hsc_ptr 24)) buf)
    {-# LINE 100 "System\Win32\Process.hsc" #-}
        (((\hsc_ptr -> peekByteOff hsc_ptr 28)) buf)
    {-# LINE 101 "System\Win32\Process.hsc" #-}
        (peekTString $ ((\hsc_ptr -> hsc_ptr `plusPtr` 36)) buf)
    {-# LINE 102 "System\Win32\Process.hsc" #-}

    -- | Enumerate processes using Process32First and Process32Next
    th32SnapEnumProcesses :: Th32SnapHandle -> IO [ProcessEntry32]
    th32SnapEnumProcesses h = allocaBytes ((556)) $ \pe -> do
    {-# LINE 106 "System\Win32\Process.hsc" #-}
        ((\hsc_ptr -> pokeByteOff hsc_ptr 0)) pe (((556))::DWORD)
    {-# LINE 107 "System\Win32\Process.hsc" #-}
        ok <- c_Process32First h pe
        readAndNext ok pe []
        where
            readAndNext ok pe res
                | not ok    = do
                    err <- getLastError
                    if err == (18)
    {-# LINE 114 "System\Win32\Process.hsc" #-}
                        then return $ reverse res
                        else failWith "th32SnapEnumProcesses: Process32First/Process32Next" err
                | otherwise = do
                    entry <- peekProcessEntry32 pe
                    ok' <- c_Process32Next h pe
                    readAndNext ok' pe (entry:res)