+foreign import ccall unsafe "link"
+ c_link :: CString -> CString -> IO CInt
+
+foreign import ccall unsafe "mkfifo"
+ c_mkfifo :: CString -> CMode -> IO CInt
+
+foreign import ccall unsafe "pathconf"
+ c_pathconf :: CString -> CInt -> IO CLong
+
+foreign import ccall unsafe "pipe"
+ c_pipe :: Ptr CInt -> IO CInt
+
+foreign import ccall unsafe "__hscore_sigaddset"
+ c_sigaddset :: Ptr CSigset -> CInt -> IO CInt