[Haskell-cafe] FFI: how to allocate a const char * from haskell

Hello, I need to call a c method which take a const char * something like void hkl_holder_add_axis(const struct holder *holder, const char *name); during all the life of this object, the const char* should be accessible. So from haskell I need to create a CString which will not be affected by the garbage collection. The memory should be release only when the given object is freed. or when the program stop. when I use alloca, the memory is releases and the code segfault. I think that I could use malloc, but in that case I have a memory leak. (this is not that important in my case, since I create less than 10 of these objects). I would like you advice in order to solve this properly. thanks for your help. Frederic