System.Posix.DynamicLinker.Prim

dlopen(3) and friends Derived from GModule.chs by M.Weber & M.Chakravarty which is part of c2hs. I left the API more or less the same, mostly the flags are different.

low level API

c_dlopen :: CString -> CInt -> IO (Ptr ())

c_dlsym :: Ptr () -> CString -> IO (FunPtr a)

c_dlerror :: IO CString

c_dlclose :: Ptr () -> IO CInt

haveRtldNext :: Bool

On some hosts (e.g. SuSe and Ubuntu Linux) RTLD_NEXT (and RTLD_DEFAULT) are not visible without setting the macro _GNU_SOURCE. Since we don't want to define this macro, you can use the function haveRtldNext to check wether the flag Next is available. Ideally, this will be optimized by the compiler so that it should be as efficient as an #ifdef.

If you fail to test the flag and use it although it is undefined, packDL will throw an error.

haveRtldLocal :: Bool

Deprecated: defaults to True

packRTLDFlags :: [RTLDFlags] -> CInt

data RTLDFlags

Flags for dlopen.

Constructors

RTLD_LAZY

RTLD_NOW

RTLD_GLOBAL

RTLD_LOCAL

Instances

Read RTLDFlags

Methods

readsPrec :: Int -> ReadS RTLDFlags

readList :: ReadS [RTLDFlags]

readPrec :: ReadPrec RTLDFlags

readListPrec :: ReadPrec [RTLDFlags]

Show RTLDFlags

Methods

showsPrec :: Int -> RTLDFlags -> ShowS

show :: RTLDFlags -> String

showList :: [RTLDFlags] -> ShowS

packDL :: DL -> Ptr ()

data DL

Flags for dlsym. Notice that Next might not be available on your particular platform! Use haveRtldNext.

If RTLD_DEFAULT is not defined on your platform, packDL Default reduces to nullPtr.

Constructors

Null

Next

Default

DLHandle (Ptr ())

Instances

Show DL

Methods

showsPrec :: Int -> DL -> ShowS

show :: DL -> String

showList :: [DL] -> ShowS