From 77c5e99644af10d94c6ce32d580d72b81267c933 Mon Sep 17 00:00:00 2001 From: Paul Chaignon Date: Mon, 20 Dec 2021 22:45:28 +0100 Subject: 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: 30da46b5dc3a ("tools: bpftool: add a command to dump the trace pipe") Signed-off-by: Quentin Monnet Signed-off-by: Paul Chaignon Signed-off-by: Andrii Nakryiko Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20211220214528.GA11706@Mem Signed-off-by: Sasha Levin --- tools/bpf/bpftool/main.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tools/bpf') diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c index 02eaaf065f65..d27ec4f852bb 100644 --- a/tools/bpf/bpftool/main.c +++ b/tools/bpf/bpftool/main.c @@ -402,6 +402,8 @@ int main(int argc, char **argv) }; int opt, ret; + setlinebuf(stdout); + last_do_help = do_help; pretty_output = false; json_output = false; -- cgit v1.2.3