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1// Copyright 2015 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[JavaPackage="org.chromium.mojo.bindings"]
6module mojo;
7
8// For each user-defined interface, some control functions are provided at the
9// same end of the message pipe as the user-defined interface, providing
10// information about the user-defined interface.
11
12////////////////////////////////////////////////////////////////////////////////
13// Run@0xFFFFFFFF(RunInput input) => (RunOutput? output);
14//
15// This control function runs the input command. If the command is not
16// supported, |output| is set to null; otherwise |output| stores the result,
17// whose type depends on the input.
18//
19// TODO(yzshen): Once union support is ready, switch the following definition
20// to:
21// struct RunMessageParams {
22//   RunInput input;
23// };
24// union RunInput {
25//   QueryVersion query_version;
26// };
27//
28// struct RunResponseMessageParams {
29//   RunOutput? output;
30// };
31// union RunOutput {
32//   QueryVersionResult query_version_result;
33// };
34
35const uint32 kRunMessageId = 0xFFFFFFFF;
36
37struct RunMessageParams {
38  // The reserved fields make the layout compatible with the RunInput union
39  // described above.
40  uint32 reserved0;  // Must be set to 16.
41  uint32 reserved1;  // Must be set to 0;
42  QueryVersion query_version;
43};
44
45struct RunResponseMessageParams {
46  // The reserved fields make the layout compatible with the RunOutput union
47  // described above.
48  uint32 reserved0;  // Must be set to 16.
49  uint32 reserved1;  // Must be set to 0.
50  QueryVersionResult query_version_result;
51};
52
53// Queries the max supported version of the user-defined interface.
54struct QueryVersion {
55};
56struct QueryVersionResult {
57  uint32 version;
58};
59
60////////////////////////////////////////////////////////////////////////////////
61// RunOrClosePipe@0xFFFFFFFE(RunOrClosePipeInput input);
62//
63// This control function runs the input command. If the operation fails or the
64// command is not supported, the message pipe is closed.
65//
66// TODO(yzshen): Once union support is ready, switch the following definition
67// to:
68// struct RunOrClosePipeMessageParams {
69//   RunOrClosePipeInput input;
70// };
71// union RunOrClosePipeInput {
72//   RequireVersion require_version;
73// };
74
75const uint32 kRunOrClosePipeMessageId = 0xFFFFFFFE;
76
77struct RunOrClosePipeMessageParams {
78  // The reserved fields make the layout compatible with the RunOrClosePipeInput
79  // union described above.
80  uint32 reserved0;  // Must be set to 16.
81  uint32 reserved1;  // Must be set to 0.
82  RequireVersion require_version;
83};
84
85// If the specified version of the user-defined interface is not supported, the
86// function fails and the pipe is closed.
87struct RequireVersion {
88  uint32 version;
89};
90