+XBT_PUBLIC(void) gras_global_init(int *argc, char **argv);
+XBT_PUBLIC(void) gras_create_environment(const char *file);
+XBT_PUBLIC(void) gras_function_register(const char *name, void* code);
+XBT_PUBLIC(void) gras_launch_application(const char *file);
+XBT_PUBLIC(void) gras_clean(void);
+XBT_PUBLIC(void) gras_main(void);