Re: [PATCH v2 bpf-next] bpf: Print error message for bpftool cgroup show

[Daniel Borkmann <daniel@xxxxxxxxxxxxx>]

On 12/24/19 2:17 AM, Hechao Li wrote:
> 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@xxxxxx>

Applied, thanks!