124 lines
3.3 KiB
Haskell
124 lines
3.3 KiB
Haskell
{-# LANGUAGE Trustworthy #-}
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#if __GLASGOW_HASKELL__ >= 709
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{-# OPTIONS_GHC -fno-warn-trustworthy-safe #-}
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#endif
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-----------------------------------------------------------------------------
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-- |
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-- Module : System.Posix.DynamicLinker.Prim
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-- Copyright : (c) Volker Stolz <vs@foldr.org> 2003
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-- License : BSD-style (see the file libraries/base/LICENSE)
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--
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-- Maintainer : vs@foldr.org
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-- Stability : provisional
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-- Portability : non-portable (requires POSIX)
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--
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-- @dlopen(3)@ and friends
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-- Derived from @GModule.chs@ by M.Weber & M.Chakravarty which is part of c2hs.
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-- I left the API more or less the same, mostly the flags are different.
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--
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-----------------------------------------------------------------------------
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module System.Posix.DynamicLinker.Prim (
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-- * low level API
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c_dlopen,
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c_dlsym,
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c_dlerror,
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c_dlclose,
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-- dlAddr, -- XXX NYI
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haveRtldNext,
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haveRtldLocal,
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packRTLDFlags,
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RTLDFlags(..),
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packDL,
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DL(..),
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)
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where
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#include "HsUnix.h"
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import Data.Bits ( (.|.) )
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import Foreign.Ptr ( Ptr, FunPtr, nullPtr )
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import Foreign.C.Types
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import Foreign.C.String ( CString )
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-- |On some hosts (e.g. SuSe and Ubuntu Linux) @RTLD_NEXT@ (and
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-- @RTLD_DEFAULT@) are not visible without setting the macro
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-- @_GNU_SOURCE@. Since we don\'t want to define this macro, you can use
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-- the function 'haveRtldNext' to check wether the flag `Next` is
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-- available. Ideally, this will be optimized by the compiler so that it
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-- should be as efficient as an @#ifdef@.
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--
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-- If you fail to test the flag and use it although it is undefined,
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-- 'packDL' will throw an error.
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haveRtldNext :: Bool
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#ifdef HAVE_RTLDNEXT
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haveRtldNext = True
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foreign import ccall unsafe "__hsunix_rtldNext" rtldNext :: Ptr a
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#else /* HAVE_RTLDNEXT */
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haveRtldNext = False
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#endif /* HAVE_RTLDNEXT */
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#ifdef HAVE_RTLDDEFAULT
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foreign import ccall unsafe "__hsunix_rtldDefault" rtldDefault :: Ptr a
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#endif /* HAVE_RTLDDEFAULT */
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haveRtldLocal :: Bool
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haveRtldLocal = True
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{-# DEPRECATED haveRtldLocal "defaults to True" #-}
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-- |Flags for 'System.Posix.DynamicLinker.dlopen'.
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data RTLDFlags
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= RTLD_LAZY
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| RTLD_NOW
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| RTLD_GLOBAL
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| RTLD_LOCAL
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deriving (Show, Read)
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foreign import ccall unsafe "dlopen" c_dlopen :: CString -> CInt -> IO (Ptr ())
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foreign import ccall unsafe "dlsym" c_dlsym :: Ptr () -> CString -> IO (FunPtr a)
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foreign import ccall unsafe "dlerror" c_dlerror :: IO CString
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foreign import ccall unsafe "dlclose" c_dlclose :: (Ptr ()) -> IO CInt
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packRTLDFlags :: [RTLDFlags] -> CInt
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packRTLDFlags flags = foldl (\ s f -> (packRTLDFlag f) .|. s) 0 flags
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packRTLDFlag :: RTLDFlags -> CInt
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packRTLDFlag RTLD_LAZY = #const RTLD_LAZY
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packRTLDFlag RTLD_NOW = #const RTLD_NOW
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packRTLDFlag RTLD_GLOBAL = #const RTLD_GLOBAL
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packRTLDFlag RTLD_LOCAL = #const RTLD_LOCAL
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-- |Flags for 'System.Posix.DynamicLinker.dlsym'. Notice that 'Next'
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-- might not be available on your particular platform! Use
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-- 'haveRtldNext'.
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--
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-- If 'RTLD_DEFAULT' is not defined on your platform, 'packDL' 'Default'
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-- reduces to 'nullPtr'.
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data DL = Null | Next | Default | DLHandle (Ptr ()) deriving (Show)
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packDL :: DL -> Ptr ()
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packDL Null = nullPtr
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#ifdef HAVE_RTLDNEXT
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packDL Next = rtldNext
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#else
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packDL Next = error "RTLD_NEXT not available"
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#endif
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#ifdef HAVE_RTLDDEFAULT
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packDL Default = rtldDefault
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#else
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packDL Default = nullPtr
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#endif
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packDL (DLHandle h) = h
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