Commit a259c73d authored Dec 20, 2021 by Paul Chaignon Committed by Greg Kroah-Hartman Jan 27, 2022

bpftool: Enable line buffering for stdout



[ 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: 30da46b5 ("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>

parent eb599bf3

tools/bpf/bpftool/main.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;