netdev - [PATCH] ss: Tone down cgroup path resolution

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Message-ID: <20250210141103.44270-1-mkoutny@suse.com>
Date: Mon, 10 Feb 2025 15:11:03 +0100
From: Michal Koutný <mkoutny@...e.com>
To: netdev@...r.kernel.org
Cc: mkoutny@...e.com,
	mkubecek@...e.cz
Subject: [PATCH] ss: Tone down cgroup path resolution

Sockets and cgroups have different lifetimes (e.g. fd passing between
cgroups) so obtaining a cgroup id to a removed cgroup dir is not an
error. Furthermore, the message is printed for each such a socket.
Improve user experience by silencing these specific errors.
---
 lib/fs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/fs.c b/lib/fs.c
index 622f28b3..6fe1d6db 100644
--- a/lib/fs.c
+++ b/lib/fs.c
@@ -223,7 +223,8 @@ char *get_cgroup2_path(__u64 id, bool full)
 
 	fd = open_by_handle_at(mnt_fd, fhp, 0);
 	if (fd < 0) {
-		fprintf(stderr, "Failed to open cgroup2 by ID\n");
+		if (errno != ESTALE)
+			fprintf(stderr, "Failed to open cgroup2 by ID\n");
 		goto out;
 	}
 
-- 
2.48.1