+static int kill_all_users(void) {
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *de;
+ int r = 0;
+
+ d = opendir("/run/systemd/users");
+ if (!d) {
+ if (errno == ENOENT)
+ return 0;
+
+ log_error("Failed to open /run/systemd/users: %m");
+ return -errno;
+ }
+
+ FOREACH_DIRENT(de, d, return -errno) {
+ _cleanup_free_ char *cgroup = NULL;
+ char *a;
+ int k;
+
+ if (!dirent_is_file(de))
+ continue;
+
+ a = strappenda("/run/systemd/users/", de->d_name);
+
+ k = parse_env_file(a, NEWLINE, "CGROUP", &cgroup, NULL);
+ if (k < 0) {
+ if (k != -ENOENT) {
+ log_error("Failed to read user data: %s", strerror(-k));
+ r = k;
+ }
+
+ continue;
+ }
+
+ if (!cgroup) {
+ log_error("User data did not contain cgroup field.");
+ r = -ENOENT;
+ continue;
+ }
+
+ k = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, cgroup, true);
+ if (k < 0) {
+ log_error("Failed to kill cgroup %s: %s", cgroup, strerror(-k));
+ r = k;
+ }
+ }
+
+ return r;
+}
+
+static int kill_all_sessions(void) {
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *de;
+ int r = 0;
+
+ d = opendir("/run/systemd/sessions");
+ if (!d) {
+ if (errno == ENOENT)
+ return 0;
+
+ log_error("Failed to open /run/systemd/sessions: %m");
+ return -errno;
+ }
+
+ FOREACH_DIRENT(de, d, return -errno) {
+ _cleanup_free_ char *cgroup = NULL;
+ char *a;
+ int k;
+
+ if (!dirent_is_file(de))
+ continue;
+
+ a = strappenda("/run/systemd/sessions/", de->d_name);
+
+ k = parse_env_file(a, NEWLINE, "CGROUP", &cgroup, NULL);
+ if (k < 0) {
+ if (k != -ENOENT) {
+ log_error("Failed to read session data: %s", strerror(-k));
+ r = k;
+ }
+
+ continue;
+ }
+
+ if (!cgroup) {
+ log_error("Session data did not contain cgroup field.");
+ r = -ENOENT;
+ continue;
+ }
+
+ k = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, cgroup, true);
+ if (k < 0) {
+ log_error("Failed to kill cgroup %s: %s", cgroup, strerror(-k));
+ r = k;
+ }
+ }
+
+ return r;
+}
+