linux-kernel - [PATCH 2/8] perf: Use strerror

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Date:	Thu, 14 Aug 2014 02:20:30 +0000
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Naohiro Aota <naota@...sp.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 2/8] perf: Use strerror_r instead of strerror

Use strerror_r instead of strerror in error messages for
thread-safety. This also introduce STRERR_BUFSIZE macro
for the default size of message buffer for strerror_r.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
---
 tools/perf/perf.c       |   10 +++++++---
 tools/perf/util/debug.h |    3 +++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 2282d41..452a847 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -313,6 +313,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 	int status;
 	struct stat st;
 	const char *prefix;
+	char sbuf[STRERR_BUFSIZE];
 
 	prefix = NULL;
 	if (p->option & RUN_SETUP)
@@ -343,7 +344,8 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 	status = 1;
 	/* Check for ENOSPC and EIO errors.. */
 	if (fflush(stdout)) {
-		fprintf(stderr, "write failure on standard output: %s", strerror(errno));
+		fprintf(stderr, "write failure on standard output: %s",
+			strerror_r(errno, sbuf, sizeof(sbuf)));
 		goto out;
 	}
 	if (ferror(stdout)) {
@@ -351,7 +353,8 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 		goto out;
 	}
 	if (fclose(stdout)) {
-		fprintf(stderr, "close failed on standard output: %s", strerror(errno));
+		fprintf(stderr, "close failed on standard output: %s",
+			strerror_r(errno, sbuf, sizeof(sbuf)));
 		goto out;
 	}
 	status = 0;
@@ -466,6 +469,7 @@ void pthread__unblock_sigwinch(void)
 int main(int argc, const char **argv)
 {
 	const char *cmd;
+	char sbuf[STRERR_BUFSIZE];
 
 	/* The page_size is placed in util object. */
 	page_size = sysconf(_SC_PAGE_SIZE);
@@ -561,7 +565,7 @@ int main(int argc, const char **argv)
 	}
 
 	fprintf(stderr, "Failed to run command '%s': %s\n",
-		cmd, strerror(errno));
+		cmd, strerror_r(errno, sbuf, sizeof(sbuf)));
 out:
 	return 1;
 }
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index 6944ea3..be264d6 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -3,6 +3,7 @@
 #define __PERF_DEBUG_H
 
 #include <stdbool.h>
+#include <string.h>
 #include "event.h"
 #include "../ui/helpline.h"
 #include "../ui/progress.h"
@@ -36,6 +37,8 @@ extern int debug_ordered_events;
 #define pr_oe_time(t, fmt, ...)  pr_time_N(1, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_oe_time2(t, fmt, ...) pr_time_N(2, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
 
+#define STRERR_BUFSIZE	128	/* For the buffer size of strerror_r */
+
 int dump_printf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
 void trace_event(union perf_event *event);
 

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