- char *t;
-
- if (path && suffix)
- t = join("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
- else if (path)
- t = join("/sys/fs/cgroup/", controller, "/", path, NULL);
- else if (suffix)
- t = join("/sys/fs/cgroup/", controller, "/", suffix, NULL);
- else
- t = join("/sys/fs/cgroup/", controller, NULL);
+ char *t = NULL;
+
+ if (!(controller || path))
+ return -EINVAL;
+
+ if (controller) {
+ if (path && suffix)
+ t = join("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
+ else if (path)
+ t = join("/sys/fs/cgroup/", controller, "/", path, NULL);
+ else if (suffix)
+ t = join("/sys/fs/cgroup/", controller, "/", suffix, NULL);
+ else
+ t = join("/sys/fs/cgroup/", controller, NULL);
+ } else {
+ if (path && suffix)
+ t = join(path, "/", suffix, NULL);
+ else if (path)
+ t = strdup(path);
+ }