perf_counter tools: Guard against record damaging existing files

Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index 23d1224..96bfb7c 100644 (file)
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -340,7 +340,7 @@ static int __cmd_record(int argc, const char **argv)
        assert(nr_cpus <= MAX_NR_CPUS);
        assert(nr_cpus >= 0);
 
-       output = open(output_name, O_CREAT|O_RDWR, S_IRWXU);
+       output = open(output_name, O_CREAT|O_EXCL|O_RDWR, S_IRWXU);
        if (output < 0) {
                perror("failed to create output file");
                exit(-1);