Foreign.LibFFI.Types

Arguments and return types

Arguments

Integral types

argCInt :: CInt -> Arg

argCUInt :: CUInt -> Arg

argCLong :: CLong -> Arg

argCULong :: CULong -> Arg

argInt8 :: Int8 -> Arg

Note that on e.g. x86_64, Int /= CInt

argInt16 :: Int16 -> Arg

argInt32 :: Int32 -> Arg

argInt64 :: Int64 -> Arg

argWord8 :: Word8 -> Arg

argWord16 :: Word16 -> Arg

argWord32 :: Word32 -> Arg

argWord64 :: Word64 -> Arg

Floating point types

argCFloat :: CFloat -> Arg

argCDouble :: CDouble -> Arg

Various other C types

argCSize :: CSize -> Arg

argCTime :: CTime -> Arg

argCChar :: CChar -> Arg

argCUChar :: CUChar -> Arg

argCWchar :: CWchar -> Arg

argPtr :: Ptr a -> Arg

argFunPtr :: FunPtr a -> Arg

Strings

argString :: String -> Arg

The string argument is passed to C as a char * pointer, which is freed afterwards. The argument should not contain zero-bytes.

argByteString :: ByteString -> Arg

Like argString, but for ByteString's.

argConstByteString :: ByteString -> Arg

Like argByteString, but changing the string from C breaks referential transparency.

Return types

Integral types

retVoid :: RetType ()

retCInt :: RetType CInt

retCUInt :: RetType CUInt

retCLong :: RetType CLong

retCULong :: RetType CULong

retInt8 :: RetType Int8

retInt16 :: RetType Int16

retInt32 :: RetType Int32

retInt64 :: RetType Int64

retWord8 :: RetType Word8

retWord16 :: RetType Word16

retWord32 :: RetType Word32

retWord64 :: RetType Word64

Floating point types

retCFloat :: RetType CFloat

retCDouble :: RetType CDouble

Various other C types

retCSize :: RetType CSize

retCTime :: RetType CTime

retCChar :: RetType CChar

retCUChar :: RetType CUChar

retCWchar :: RetType CWchar

retPtr :: RetType a -> RetType (Ptr a)

retFunPtr :: RetType a -> RetType (FunPtr a)

Strings

retCString :: RetType CString

retString :: RetType String

Peek a String out of the returned char *. The char * is not freed.

retByteString :: RetType ByteString

Like retString, but for ByteString's

retMallocByteString :: RetType ByteString

Make a ByteString out of the returned char *. The char * will be free(3)ed when the ByteString is garbage collected.