kern_return_t IOMobileFramebufferGetLayerDefaultSurface(IOMobileFramebufferRef connect, int zero, CoreSurfaceBufferRef *surface);
kern_return_t IOMobileFramebufferOpen(io_service_t service, task_port_t task, uint32_t type, IOMobileFramebufferRef *connect);
kern_return_t IOMobileFramebufferGetLayerDefaultSurface(IOMobileFramebufferRef connect, int zero, CoreSurfaceBufferRef *surface);
kern_return_t IOMobileFramebufferOpen(io_service_t service, task_port_t task, uint32_t type, IOMobileFramebufferRef *connect);