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bpftool: Display cookie for tracing link probe

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Display cookie for tracing link probe, in plain mode:

 #bpftool link
5: tracing  prog 34
	prog_type tracing  attach_type trace_fentry
	target_obj_id 1  target_btf_id 60355
	cookie 4503599627370496
	pids test_progs(176)

And in json mode:

 #bpftool link -j | jq
{
    "id": 5,
    "type": "tracing",
    "prog_id": 34,
    "prog_type": "tracing",
    "attach_type": "trace_fentry",
    "target_obj_id": 1,
    "target_btf_id": 60355,
    "cookie": 4503599627370496,
    "pids": [
      {
        "pid": 176,
        "comm": "test_progs"
      }
    ]
 }

Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250606165818.3394397-3-chen.dylane@linux.dev
This commit is contained in:
Tao Chen
2025-06-07 00:58:16 +08:00
committed by Andrii Nakryiko
parent d77efc0ef5
commit ad954cbe08
1 changed files with 3 additions and 0 deletions
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3
tools/bpf/bpftool/link.c
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@@ -503,6 +503,7 @@ static int show_link_close_json(int fd, struct bpf_link_info *info)
json_wtr);
jsonw_uint_field(json_wtr, "target_obj_id", info->tracing.target_obj_id);
jsonw_uint_field(json_wtr, "target_btf_id", info->tracing.target_btf_id);
jsonw_uint_field(json_wtr, "cookie", info->tracing.cookie);
break;
case BPF_LINK_TYPE_CGROUP:
jsonw_lluint_field(json_wtr, "cgroup_id",
@@ -900,6 +901,8 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info)
printf("\n\ttarget_obj_id %u target_btf_id %u ",
info->tracing.target_obj_id,
info->tracing.target_btf_id);
if (info->tracing.cookie)
printf("\n\tcookie %llu ", info->tracing.cookie);
break;
case BPF_LINK_TYPE_CGROUP:
printf("\n\tcgroup_id %zu ", (size_t)info->cgroup.cgroup_id);