[PATCH] perf stat: fix default output file

From: Stephane Eranian
Date: Tue May 15 2012 - 07:11:15 EST

The following commit:

commit 56f3bae70638b33477a6015fd362ccfe354fd3ee
Author: Jim Cromie <jim.cromie@xxxxxxxxx>
Date: Wed Sep 7 17:14:00 2011 -0600

perf stat: Add --log-fd <N> option to redirect stderr elsewhere

introduced a bug in the way perf stat outputs the results by default, i.e.,
without the --log-fd or --output option. It would default to writing to
file descriptor 0, i.e., stdin. Writing to stdin is allowed and is equivalent
to writing to stdout. However, there is a major difference for any script that
was already capturing the output of perf stat via redirection:

perf stat >/tmp/log .... or perf stat 2>/tmp/log ....

They would not capture anything anymore. They would have to do:
perf stat 0>/tmp/log ...

This breaks compatibility with existing scripts and does not look very

This patch fixes the problem by looking at output_fd only when it
was modified by user (> 0). It also checks that the value if positive.
Passing --log-fd 0 is ignored.

I would also argue that defaulting to stderr for the results is not
the right thing to do, though this patch does not address this specific

Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 36603e4..56e6040 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1179,6 +1179,12 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
fprintf(stderr, "cannot use both --output and --log-fd\n");
usage_with_options(stat_usage, options);
+ if (output_fd < 0) {
+ fprintf(stderr, "argument to --log-fd must be a > 0\n");
+ usage_with_options(stat_usage, options);
+ }
if (!output) {
struct timespec tm;
mode = append_file ? "a" : "w";
@@ -1190,7 +1196,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
clock_gettime(CLOCK_REALTIME, &tm);
fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
- } else if (output_fd != 2) {
+ } else if (output_fd > 0) {
mode = append_file ? "a" : "w";
output = fdopen(output_fd, mode);
if (!output) {
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