| From 25f9880e3a57ab5ea0a08159c7cbb4ad05bf4ca1 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Mon, 20 Dec 2021 22:45:28 +0100 |
| Subject: bpftool: Enable line buffering for stdout |
| |
| From: Paul Chaignon <paul@isovalent.com> |
| |
| [ Upstream commit 1a1a0b0364ad291bd8e509da104ac8b5b1afec5d ] |
| |
| The output of bpftool prog tracelog is currently buffered, which is |
| inconvenient when piping the output into other commands. A simple |
| tracelog | grep will typically not display anything. This patch fixes it |
| by enabling line buffering on stdout for the whole bpftool binary. |
| |
| Fixes: 30da46b5dc3a ("tools: bpftool: add a command to dump the trace pipe") |
| Signed-off-by: Quentin Monnet <quentin@isovalent.com> |
| Signed-off-by: Paul Chaignon <paul@isovalent.com> |
| Signed-off-by: Andrii Nakryiko <andrii@kernel.org> |
| Acked-by: Yonghong Song <yhs@fb.com> |
| Link: https://lore.kernel.org/bpf/20211220214528.GA11706@Mem |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| tools/bpf/bpftool/main.c | 2 ++ |
| 1 file changed, 2 insertions(+) |
| |
| diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c |
| index 7d3cfb0ccbe61..4b03983acbefe 100644 |
| --- a/tools/bpf/bpftool/main.c |
| +++ b/tools/bpf/bpftool/main.c |
| @@ -362,6 +362,8 @@ int main(int argc, char **argv) |
| }; |
| int opt, ret; |
| |
| + setlinebuf(stdout); |
| + |
| last_do_help = do_help; |
| pretty_output = false; |
| json_output = false; |
| -- |
| 2.34.1 |
| |
