Reland "Open MessagePumpLibevent's pipe with O_CLOEXEC"

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 347 matching lines @@
 // existence of it with the given suffix.
 BASE_EXPORT int GetUniquePathNumber(const FilePath& path,
                                     const FilePath::StringType& suffix);
 
 // Sets the given |fd| to non-blocking mode.
 // Returns true if it was able to set it in the non-blocking mode, otherwise
 // false.
 BASE_EXPORT bool SetNonBlocking(int fd);
 
 #if defined(OS_POSIX)
+// Creates a non-blocking, close-on-exec pipe.
+// This creates a non-blocking pipe that is not intended to be shared with any
+// child process. This will be done atomically if the operating system supports
+// it. Returns true if it was able to create the pipe, otherwise false.
+BASE_EXPORT bool CreateLocalNonBlockingPipe(int fds[2]);
+
+// Sets the given |fd| to close-on-exec mode.
+// Returns true if it was able to set it in the close-on-exec mode, otherwise
+// false.
+BASE_EXPORT bool SetCloseOnExec(int fd);
+
 // Test that |path| can only be changed by a given user and members of
 // a given set of groups.
 // Specifically, test that all parts of |path| under (and including) |base|:
 // * Exist.
 // * Are owned by a specific user.
 // * Are not writable by all users.
 // * Are owned by a member of a given set of groups, or are not writable by
 //   their group.
 // * Are not symbolic links.
 // This is useful for checking that a config file is administrator-controlled.
@@ skipping 63 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_