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: 30da46b5dc ("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>

This commit is contained in:

Paul Chaignon

2021-12-20 22:45:28 +01:00

committed by

Greg Kroah-Hartman

parent 009bb7ee15

commit e668ac6506

1 changed files with 2 additions and 0 deletions

									
										2

tools/bpf/bpftool/main.c
									
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				@ -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;

bpftool: Enable line buffering for stdout

2 tools/bpf/bpftool/main.c Unescape Escape View File

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tools/bpf/bpftool/main.c

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