From a7e6de218b255a14229953a1f6656915ece9db1b Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 9 Feb 2018 16:58:35 +0100
Subject: [PATCH] cgtop: add helper for checking if we are operating on the
 root cgroup

---
 src/cgtop/cgtop.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/cgtop/cgtop.c b/src/cgtop/cgtop.c
index 1575cd51ff4..229aadd2698 100644
--- a/src/cgtop/cgtop.c
+++ b/src/cgtop/cgtop.c
@@ -125,6 +125,10 @@ static const char *maybe_format_bytes(char *buf, size_t l, bool is_valid, uint64
         return format_bytes(buf, l, t);
 }
 
+static bool is_root_cgroup(const char *path) {
+        return isempty(path) || path_equal(path, "/");
+}
+
 static int process(
                 const char *controller,
                 const char *path,
@@ -196,7 +200,7 @@ static int process(
 
         } else if (streq(controller, "pids") && arg_count == COUNT_PIDS) {
 
-                if (isempty(path) || path_equal(path, "/")) {
+                if (is_root_cgroup(path)) {
                         r = procfs_tasks_get_current(&g->n_tasks);
                         if (r < 0)
                                 return r;
-- 
2.47.3