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{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE MagicHash #-}
{-# LANGUAGE CApiFFI #-}
module Main where
import Data.List (foldl')
import Data.Bits
import GHC.Ptr
import Foreign.Ptr
import Foreign.C.Types
type FD = CInt
type CString = Ptr CChar
foreign import ccall unsafe "runInteractiveProcess"
c_runInteractiveProcess
:: Ptr CString
-> CString
-> Ptr CString
-> FD
-> FD
-> FD
-> Ptr FD
-> Ptr FD
-> Ptr FD
-> Ptr CInt
-> Ptr CInt
-> CInt -- flags
-> Ptr CString
-> IO CInt
main = do
c_runInteractiveProcess
(f 0x1)
(f 0x2)
(f 0x3)
0x4 0x5 0x6
(f 0x7)
(f 0x8)
(f 0x9)
(f 0xa)
(f 0xb)
0xcccccccc
(f 0xd)
-- | Fill a word with a nibble.
-- e.g. @f 1 == 0x1111111111111111@.
f :: Int -> Ptr a
f n = intPtrToPtr $ fromIntegral $ foldl' (.|.) 0 (map (n `shiftL`) [0,4..60])
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