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@hitachi.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naohiro Aota <naota@elisp.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20140814022232.3545.14026.stgit@kbuild-fedora.novalocal
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 10 insertions, 3 deletions

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 2282d41879a2..452a8474d29d 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 6944ea3a119b..be264d6f3b30 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);