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.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20170908084621.31595-2-jolsa@kernel.org
[ Add definitions for O_CLOEXEC for older systems ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index e84bbc8ec058..263f5a906ba5 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -10,6 +10,16 @@
 #include "util.h"
 #include "debug.h"
 
+#ifndef O_CLOEXEC
+#ifdef __sparc__
+#define O_CLOEXEC       0x400000
+#elif defined(__alpha__) || defined(__hppa__)
+#define O_CLOEXEC       010000000
+#else
+#define O_CLOEXEC       02000000
+#endif
+#endif
+
 static bool check_pipe(struct perf_data_file *file)
 {
         struct stat st;
@@ -96,7 +106,8 @@ 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,