Replaced strerror() calls with threadsafe strerror_r()

runtime/bin/utils_linux.cc

Index: runtime/bin/utils_linux.cc
diff --git a/runtime/bin/utils_linux.cc b/runtime/bin/utils_linux.cc
index e8230c89b4da30061e83dbb33ac39fc5564845de..66e6929371936be9c7595e94f094a8fab0acdc06 100644
--- a/runtime/bin/utils_linux.cc
+++ b/runtime/bin/utils_linux.cc
@@ -19,7 +19,9 @@ 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_buf[kBufferSize];
+  SetMessage(strerror_r(errno, error_buf, kBufferSize));
 }
 
 
@@ -27,7 +29,9 @@ 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_buf[kBufferSize];
+    SetMessage(strerror_r(code, error_buf, kBufferSize));
   } else if (sub_system == kGetAddressInfo) {
     SetMessage(gai_strerror(code));
   } else {