Display the license string in bpftool prog command, like:

  # bpftool prog list
  1: kprobe  name func_begin  tag 59bef35a42fda602 license GPL
          loaded_at Apr 22/15:46  uid 0
          xlated 272B  not jited  memlock 4096B  map_ids 1

  # bpftool prog show --json
  [{"id":1,"type":"kprobe","name":"fun ... ,"license":"GPL", ... ]

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/bpf/bpftool/prog.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 548adb9b7317..ea5ede899cf7 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -235,6 +235,8 @@ static void print_prog_json(struct bpf_prog_info *info, int 
fd)
                     info->tag[0], info->tag[1], info->tag[2], info->tag[3],
                     info->tag[4], info->tag[5], info->tag[6], info->tag[7]);
 
+       jsonw_string_field(json_wtr, "license", info->license);
+
        print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
 
        if (info->load_time) {
@@ -295,8 +297,10 @@ static void print_prog_plain(struct bpf_prog_info *info, 
int fd)
        printf("tag ");
        fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
        print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
+       printf(" license %s", info->license);
        printf("\n");
 
+
        if (info->load_time) {
                char buf[32];
 
-- 
2.13.6

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