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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-07-01 21:02:10 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-07-01 22:37:24 +0200 |
| commit | a92bef0f216bbf3d05c0c0709ea02e267f2b920e (patch) | |
| tree | e10737dada321c315588c1726f75ff2d87fecc39 | |
| parent | perf_counter: Ignore the nmi call frames in the x86-64 backtraces (diff) | |
| download | linux-a92bef0f216bbf3d05c0c0709ea02e267f2b920e.tar.xz linux-a92bef0f216bbf3d05c0c0709ea02e267f2b920e.zip | |
perf stat: Handle pipe read failures in perf stat
Building builtin-stat.c reports the following errors:
cc1: warnings being treated as errors
builtin-stat.c: In function ‘run_perf_stat’:
builtin-stat.c:242: erreur: ignoring return value of ‘read’, declared with attribute warn_unused_result
builtin-stat.c:255: erreur: ignoring return value of ‘read’, declared with attribute warn_unused_result
make: *** [builtin-stat.o] Erreur 1
This patch handles the possible pipe read failures.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246474930-6088-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | tools/perf/builtin-stat.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 01cc07efb728..27921a8ce1a9 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -239,7 +239,8 @@ static int run_perf_stat(int argc __used, const char **argv) /* * Wait until the parent tells us to go. */ - read(go_pipe[0], &buf, 1); + if (read(go_pipe[0], &buf, 1) == -1) + perror("unable to read pipe"); execvp(argv[0], (char **)argv); @@ -252,7 +253,8 @@ static int run_perf_stat(int argc __used, const char **argv) */ close(child_ready_pipe[1]); close(go_pipe[0]); - read(child_ready_pipe[0], &buf, 1); + if (read(child_ready_pipe[0], &buf, 1) == -1) + perror("unable to read pipe"); close(child_ready_pipe[0]); for (counter = 0; counter < nr_counters; counter++) |