1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// This file is used to handle differences in Mach message IDs and structures
6// that occur between different OS versions. The Mach messages that the sandbox
7// is interested in are decoded using information derived from the open-source
8// libraries, i.e. <http://www.opensource.apple.com/source/launchd/>. While
9// these messages definitions are open source, they are not considered part of
10// the stable OS API, and so differences do exist between OS versions.
11
12#ifndef SANDBOX_MAC_OS_COMPATIBILITY_H_
13#define SANDBOX_MAC_OS_COMPATIBILITY_H_
14
15#include <mach/mach.h>
16
17#include <string>
18
19#include "sandbox/mac/message_server.h"
20
21namespace sandbox {
22
23typedef uint64_t (*IPCMessageGetID)(const IPCMessage);
24
25typedef std::string (*LookUp2GetRequestName)(const IPCMessage);
26typedef void (*LookUp2FillReply)(IPCMessage, mach_port_t service_port);
27
28typedef bool (*SwapIntegerIsGetOnly)(const IPCMessage);
29
30struct LaunchdCompatibilityShim {
31  // Gets the message ID of an IPC message.
32  IPCMessageGetID ipc_message_get_id;
33
34  // The msgh_id for look_up2.
35  uint64_t msg_id_look_up2;
36
37  // The msgh_id for swap_integer.
38  uint64_t msg_id_swap_integer;
39
40  // A function to take a look_up2 message and return the string service name
41  // that was requested via the message.
42  LookUp2GetRequestName look_up2_get_request_name;
43
44  // A function to formulate a reply to a look_up2 message, given the reply
45  // message and the port to return as the service.
46  LookUp2FillReply look_up2_fill_reply;
47
48  // A function to take a swap_integer message and return true if the message
49  // is only getting the value of a key, neither setting it directly, nor
50  // swapping two keys.
51  SwapIntegerIsGetOnly swap_integer_is_get_only;
52};
53
54// Gets the compatibility shim for the launchd job subsystem.
55const LaunchdCompatibilityShim GetLaunchdCompatibilityShim();
56
57}  // namespace sandbox
58
59#endif  // SANDBOX_MAC_OS_COMPATIBILITY_H_
60