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

base/files/file_util.h

 // 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILES_FILE_UTIL_H_
 #define BASE_FILES_FILE_UTIL_H_
 
@@ skipping 303 matching lines @@
 
 // Truncates an open file to end at the location of the current file pointer.
 // This is a cross-platform analog to Windows' SetEndOfFile() function.
 BASE_EXPORT bool TruncateFile(FILE* file);
 
 // Reads at most the given number of bytes from the file into the buffer.
 // Returns the number of read bytes, or -1 on error.
 BASE_EXPORT int ReadFile(const FilePath& filename, char* data, int max_size);
 
 // Writes the given buffer into the file, overwriting any data that was
-// previously there.  Returns the number of bytes written, or -1 on error.
+// previously there. Returns the number of bytes written, or -1 on error.
+// The file will be created with a default mode (POSIX) or security
+// descriptor (Windows). To specify a mode on POSIX, use |WriteFileMode|.
 BASE_EXPORT int WriteFile(const FilePath& filename, const char* data,
                           int size);
 
 #if defined(OS_POSIX)
 // Appends |data| to |fd|. Does not close |fd| when done.  Returns true iff
 // |size| bytes of |data| were written to |fd|.
 BASE_EXPORT bool WriteFileDescriptor(const int fd, const char* data, int size);
+
+// Writes the given buffer into the file, overwriting any data that was
+// previously there. Returns the number of bytes written, or -1 on error.
+// The file is created with the given |mode|.
+BASE_EXPORT int WriteFileMode(const FilePath& filename, const char* data,

[rvargas (doing something else), 2014/10/17 22:28:58]

This function should return bool. See crbug.com/418837

[palmer, 2014/10/17 22:52:37]

Done.

+                              int size, mode_t mode);
 #endif
 
 // Appends |data| to |filename|.  Returns true iff |size| bytes of |data| were
 // written to |filename|.
 BASE_EXPORT bool AppendToFile(const FilePath& filename,
                               const char* data,
                               int size);
 
 // Gets the current working directory for the process.
 BASE_EXPORT bool GetCurrentDirectory(FilePath* path);
@@ skipping 90 matching lines @@
 // This function simulates Move(), but unlike Move() it works across volumes.
 // This function is not transactional.
 BASE_EXPORT bool CopyAndDeleteDirectory(const FilePath& from_path,
                                         const FilePath& to_path);
 #endif  // defined(OS_WIN)
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_UTIL_H_