Commits
Hechao Li committed 4783bf08f8d
bpf: Print error message for bpftool cgroup show [ Upstream commit 1162f844030ac1ac7321b5e8f6c9badc7a11428f ] Currently, when bpftool cgroup show <path> has an error, no error message is printed. This is confusing because the user may think the result is empty. Before the change: $ bpftool cgroup show /sys/fs/cgroup ID AttachType AttachFlags Name $ echo $? 255 After the change: $ ./bpftool cgroup show /sys/fs/cgroup Error: can't query bpf programs attached to /sys/fs/cgroup: Operation not permitted v2: Rename check_query_cgroup_progs to cgroup_has_attached_progs Signed-off-by: Hechao Li <hechaol@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191224011742.3714301-1-hechaol@fb.com Signed-off-by: Sasha Levin <sashal@kernel.org>