Replaced strerror() calls with threadsafe strerror_r()

runtime/bin/utils_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include <errno.h>  // NOLINT
 #include <netdb.h>  // NOLINT
 #include <sys/time.h>  // NOLINT
 
 #include "bin/utils.h"
 #include "platform/assert.h"
 
 
 namespace dart {
 namespace bin {
 
 OSError::OSError() : sub_system_(kSystem), code_(0), message_(NULL) {
   set_sub_system(kSystem);
   set_code(errno);
-  SetMessage(strerror(errno));
+  const int kBufferSize = 1024;
+  char error_message[kBufferSize];
+  strerror_r(errno, error_message, kBufferSize);
+  SetMessage(error_message);
 }
 
 
 void OSError::SetCodeAndMessage(SubSystem sub_system, int code) {
   set_sub_system(sub_system);
   set_code(code);
   if (sub_system == kSystem) {
-    SetMessage(strerror(code));
+    const int kBufferSize = 1024;
+    char error_message[kBufferSize];
+    strerror_r(code, error_message, kBufferSize);
+    SetMessage(error_message);
   } else if (sub_system == kGetAddressInfo) {
     SetMessage(gai_strerror(code));
   } else {
     UNREACHABLE();
   }
 }
 
 const char* StringUtils::ConsoleStringToUtf8(const char* str) {
   return str;
 }
@@ skipping 51 matching lines @@
 }
 
 void TimerUtils::Sleep(int64_t millis) {
   usleep(millis * 1000);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)