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| author |   Hechao Li <hechaol@fb.com> | 2019-12-23 17:17:42 -0800 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-12-26 10:35:54 +0100 |
| commit | 1162f844030ac1ac7321b5e8f6c9badc7a11428f (patch) | |
| tree | bf84a24566a166a5c26ebc952a28ec0be6c87f4c /tools/testing/selftests/bpf/test_cpp.cpp | |
| parent | libbpf: Support CO-RE relocations for LDX/ST/STX instructions (diff) | |
| download | linux-dev-1162f844030ac1ac7321b5e8f6c9badc7a11428f.tar.xz linux-dev-1162f844030ac1ac7321b5e8f6c9badc7a11428f.zip | |
bpf: Print error message for bpftool cgroup show
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
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions