From 15a0e7e31600299fa9ba076d58704116c95a8226 Mon Sep 17 00:00:00 2001
From: Shawn Landden <shawnlandden@gmail.com>
Date: Mon, 21 May 2012 22:54:41 -0700
Subject: [PATCH] cgtop: work even if not all cgroups are available

cgtop quits on startup if all the cgroup mounts it expects are not available.
Just continue without nonexistant ones.
(cherry picked from commit 63210a15e1efdbda3fb3abd9a6ae9961fd0ea153)
---
 src/cgtop/cgtop.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/cgtop/cgtop.c b/src/cgtop/cgtop.c
index b8cf3b7..a44e59f 100644
--- a/src/cgtop/cgtop.c
+++ b/src/cgtop/cgtop.c
@@ -341,17 +341,22 @@ static int refresh(Hashmap *a, Hashmap *b, unsigned iteration) {
 
         r = refresh_one("name=systemd", "/", a, b, iteration, 0);
         if (r < 0)
-                return r;
-
+                if (r != -ENOENT)
+                    return r;
         r = refresh_one("cpuacct", "/", a, b, iteration, 0);
         if (r < 0)
-                return r;
-
+                if (r != -ENOENT)
+                    return r;
         r = refresh_one("memory", "/", a, b, iteration, 0);
         if (r < 0)
-                return r;
+                if (r != -ENOENT)
+                    return r;
 
-        return refresh_one("blkio", "/", a, b, iteration, 0);
+        r = refresh_one("blkio", "/", a, b, iteration, 0);
+        if (r < 0)
+                if (r != -ENOENT)
+                    return r;
+        return 0;
 }
 
 static int group_compare(const void*a, const void *b) {