Re: [PATCH bpf-next 2/6] libbpf: add internal helper to load BTF data by FD

On Thu, Nov 19, 2020 at 03:22:40PM -0800, Andrii Nakryiko wrote:
[ ... ]

+int btf__get_from_id(__u32 id, struct btf **btf)
+{
+	struct btf *res;
+	int btf_fd;
+
+	*btf = NULL;
+	btf_fd = bpf_btf_get_fd_by_id(id);
+	if (btf_fd < 0)
+		return 0;

It should return an error.

+
+	res = btf_get_from_fd(btf_fd, NULL);
+	close(btf_fd);
+	if (IS_ERR(res))
+		return PTR_ERR(res);
+
+	*btf = res;
+	return 0;
 }