+#if 0 /// UNNEEDED by elogind
+ if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
+ unified_cache = CGROUP_UNIFIED_ALL;
+ else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
+ if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 &&
+ F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
+ unified_cache = CGROUP_UNIFIED_SYSTEMD;
+ unified_systemd_v232 = false;
+ } else if (statfs("/sys/fs/cgroup/systemd/", &fs) == 0 &&
+ F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) {
+ unified_cache = CGROUP_UNIFIED_SYSTEMD;
+ unified_systemd_v232 = true;
+ } else {
+ if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
+ return -errno;
+ if (!F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC))
+ return -ENOMEDIUM;
+ unified_cache = CGROUP_UNIFIED_NONE;
+ }
+ } else
+ return -ENOMEDIUM;
+#else
+ /* elogind can not support the unified hierarchy as a controller,
+ * so always assume a classical hierarchy.
+ * If, and only *if*, someone really wants to substitute systemd-login
+ * in an environment managed by systemd with elogind, we might have to
+ * add such a support. */
+ unified_cache = CGROUP_UNIFIED_NONE;
+#endif // 0
+
+ return 0;
+}
+
+int cg_unified_controller(const char *controller) {
+ int r;
+
+ r = cg_unified_update();
+ if (r < 0)
+ return r;
+
+ if (unified_cache == CGROUP_UNIFIED_NONE)
+ return false;
+
+ if (unified_cache >= CGROUP_UNIFIED_ALL)
+ return true;
+
+ return streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER);
+}
+
+int cg_all_unified(void) {
+ int r;
+
+ r = cg_unified_update();
+ if (r < 0)
+ return r;