[PATCH] libbpf: Return -ENODATA for missing btf section

From: Changbin Du <changbin.du@gmail.com>
To: Andrii Nakryiko <andrii@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>
Cc: Martin KaFai Lau <martin.lau@linux.dev>,
	Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>,
	Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
	Jiri Olsa <jolsa@kernel.org>,
	bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
	Changbin Du <changbin.du@gmail.com>, Leo Yan <leo.yan@linaro.org>,
	Andrii Nakryiko <andrii.nakryiko@gmail.com>
Subject: [PATCH] libbpf: Return -ENODATA for missing btf section
Date: Sat, 31 Dec 2022 23:14:36 +0800	[thread overview]
Message-ID: <20221231151436.6541-1-changbin.du@gmail.com> (raw)

As discussed before, return -ENODATA (No data available) would be more
meaningful than ENOENT (No such file or directory).

Suggested-by: Leo Yan <leo.yan@linaro.org>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
 tools/lib/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index dd2badf1a54e..2c89454c0136 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -991,7 +991,7 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
 
 	if (!btf_data) {
 		pr_warn("failed to find '%s' ELF section in %s\n", BTF_ELF_SEC, path);
-		err = -ENOENT;
+		err = -ENODATA;
 		goto done;
 	}
 	btf = btf_new(btf_data->d_buf, btf_data->d_size, base_btf);
-- 
2.37.2

