Allow POSIX callers to specify a new file's mode.

base/files/file_util_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 2104 matching lines @@
 
   ASSERT_TRUE(TouchFile(foobar, access_time, modification_time));
   File::Info file_info;
   ASSERT_TRUE(GetFileInfo(foobar, &file_info));
   EXPECT_EQ(access_time.ToInternalValue(),
             file_info.last_accessed.ToInternalValue());
   EXPECT_EQ(modification_time.ToInternalValue(),
             file_info.last_modified.ToInternalValue());
 }
 
+#if defined(OS_POSIX)
+TEST_F(FileUtilTest, WriteFileMode) {
+  FilePath data_dir =
+      temp_dir_.path().Append(FILE_PATH_LITERAL("FilePathTest"));
+
+  // Create a fresh, empty copy of this directory.
+  if (PathExists(data_dir)) {
+    ASSERT_TRUE(DeleteFile(data_dir, true));
+  }
+  ASSERT_TRUE(CreateDirectory(data_dir));
+
+  FilePath foobar(data_dir.Append(FILE_PATH_LITERAL("foobar.txt")));
+  std::string data("hello");
+  mode_t mode = 0644;
+  ASSERT_TRUE(WriteFileMode(foobar, data.c_str(), data.length(), mode));
+
+  struct stat status;
+  ASSERT_EQ(0, stat(foobar.value().c_str(), &status));
+  ASSERT_EQ(mode, status.st_mode & 0777);
+}
+#endif
+
 TEST_F(FileUtilTest, IsDirectoryEmpty) {
   FilePath empty_dir = temp_dir_.path().Append(FILE_PATH_LITERAL("EmptyDir"));
 
   ASSERT_FALSE(PathExists(empty_dir));
 
   ASSERT_TRUE(CreateDirectory(empty_dir));
 
   EXPECT_TRUE(IsDirectoryEmpty(empty_dir));
 
   FilePath foo(empty_dir.Append(FILE_PATH_LITERAL("foo.txt")));
@@ skipping 451 matching lines @@
   // Trying to close it should crash. This is important for security.
   EXPECT_DEATH(CloseWithScopedFD(fds[1]), "");
 #endif
 }
 
 #endif  // defined(OS_POSIX)
 
 }  // namespace
 
 }  // namespace base