int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid);
int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid);