From: Paul Chaignon <paul@isovalent.com>
Date: Mon, 20 Dec 2021 22:45:28 +0100
Subject: bpftool: Enable line buffering for stdout
Patch-mainline: v5.17-rc1
Git-commit: 1a1a0b0364ad291bd8e509da104ac8b5b1afec5d
References: jsc#PED-1368

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
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 tools/bpf/bpftool/main.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -408,6 +408,8 @@ int main(int argc, char **argv)
 	bool version_requested = false;
 	int opt, ret;
 
+	setlinebuf(stdout);
+
 	last_do_help = do_help;
 	pretty_output = false;
 	json_output = false;