linux-kernel - [PATCH] perfcounter: fix unhandled io return value

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Date:	Thu, 25 Jun 2009 22:21:27 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH] perfcounter: fix unhandled io return value

Building latest perfcounter fails on the following error:

cc1: warnings being treated as errors
builtin-record.c: In function ‘create_counter’:
builtin-record.c:451: erreur: ignoring return value of ‘read’, declared with attribute warn_unused_result
make: *** [builtin-record.o] Erreur 1

Just check if we successfully read the perf file descriptor.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 tools/perf/builtin-record.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 798a56d..d18546f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -448,7 +448,10 @@ try_again:
 		}
 	}
 
-	read(fd[nr_cpu][counter], &read_data, sizeof(read_data));
+	if (read(fd[nr_cpu][counter], &read_data, sizeof(read_data)) == -1) {
+		perror("Unable to read perf file descriptor\n");
+		exit(-1);
+	}
 
 	perf_header_attr__add_id(h_attr, read_data.id);
 
-- 
1.6.2.3

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