linux-kernel - [PATCH 2/3] perf tools: Open perf.data with O

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Date:   Fri,  8 Sep 2017 10:46:20 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 2/3] perf tools: Open perf.data with O_CLOEXEC flag

Do not carry the perf.data file descriptor into
the workload process and close it when perf
executes the workload.

Link: http://lkml.kernel.org/n/tip-j7qdp4ucreain1cqvy485wd4@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/data.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index e84bbc8ec058..6b9d3ec2c276 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -96,7 +96,8 @@ static int open_file_write(struct perf_data_file *file)
 	if (check_backup(file))
 		return -1;
 
-	fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
+	fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
+		  S_IRUSR|S_IWUSR);
 
 	if (fd < 0)
 		pr_err("failed to open %s : %s\n", file->path,
-- 
2.9.5