int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self);
int cg_get_user_path(char **path);
+int cg_pid_get_cgroup(pid_t pid, char **root, char **cgroup);
+int cg_pid_get_unit(pid_t pid, char **unit);
char **cg_shorten_controllers(char **controllers);