HANDLE_EINTR: parenthesize arguments

base/eintr_wrapper.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This provides a wrapper around system calls which may be interrupted by a
 // signal and return EINTR. See man 7 signal.
 //
 // On Windows, this wrapper macro does nothing.
 
 #ifndef BASE_EINTR_WRAPPER_H_
 #define BASE_EINTR_WRAPPER_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #if defined(OS_POSIX)
 
 #include <errno.h>
 
 #define HANDLE_EINTR(x) ({ \
   typeof(x) __eintr_result__; \
   do { \
-    __eintr_result__ = x; \
+    __eintr_result__ = (x); \
   } while (__eintr_result__ == -1 && errno == EINTR); \
   __eintr_result__;\
 })
 
 #else
 
-#define HANDLE_EINTR(x) x
+#define HANDLE_EINTR(x) (x)
 
 #endif  // OS_POSIX
 
 #endif  // BASE_EINTR_WRAPPER_H_