linux-kernel - [PATCH 5.10 188/563] bpftool: Enable line buffering for stdout

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Date:   Mon, 24 Jan 2022 19:39:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Quentin Monnet <quentin@...valent.com>,
        Paul Chaignon <paul@...valent.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Yonghong Song <yhs@...com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 188/563] bpftool: Enable line buffering for stdout

From: Paul Chaignon <paul@...valent.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@...valent.com>
Signed-off-by: Paul Chaignon <paul@...valent.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Acked-by: Yonghong Song <yhs@...com>
Link: https://lore.kernel.org/bpf/20211220214528.GA11706@Mem
Signed-off-by: Sasha Levin <sashal@...nel.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 c58a135dc355e..1854d6b978604 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -396,6 +396,8 @@ 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