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+// Copyright (c) 2006-2009 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.
+
+#ifndef BASE_FILE_DESCRIPTOR_POSIX_H_
+#define BASE_FILE_DESCRIPTOR_POSIX_H_
+#pragma once
+
+namespace base {
+
+// -----------------------------------------------------------------------------
+// We introduct a special structure for file descriptors in order that we are
+// able to use template specialisation to special-case their handling.
+//
+// WARNING: (Chromium only) There are subtleties to consider if serialising
+// these objects over IPC. See comments in ipc/ipc_message_utils.h
+// above the template specialisation for this structure.
+// -----------------------------------------------------------------------------
+struct FileDescriptor {
+ FileDescriptor()
+ : fd(-1),
+ auto_close(false) { }
+
+ FileDescriptor(int ifd, bool iauto_close)
+ : fd(ifd),
+ auto_close(iauto_close) { }
+
+ bool operator==(const FileDescriptor& other) const {
+ return (fd == other.fd && auto_close == other.auto_close);
+ }
+
+ // A comparison operator so that we can use these as keys in a std::map.
+ bool operator<(const FileDescriptor& other) const {
+ return other.fd < fd;
+ }
+
+ int fd;
+ // If true, this file descriptor should be closed after it has been used. For
+ // example an IPC system might interpret this flag as indicating that the
+ // file descriptor it has been given should be closed after use.
+ bool auto_close;
+};
+
+} // namespace base
+
+#endif // BASE_FILE_DESCRIPTOR_POSIX_H_