1 | /* ***** BEGIN LICENSE BLOCK *****
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2 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 | *
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4 | * The contents of this file are subject to the Mozilla Public License Version
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5 | * 1.1 (the "License"); you may not use this file except in compliance with
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6 | * the License. You may obtain a copy of the License at
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7 | * http://www.mozilla.org/MPL/
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8 | *
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9 | * Software distributed under the License is distributed on an "AS IS" basis,
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10 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 | * for the specific language governing rights and limitations under the
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12 | * License.
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13 | *
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14 | * The Original Code is Mozilla IPC.
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15 | *
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16 | * The Initial Developer of the Original Code is
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17 | * Netscape Communications Corporation.
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18 | * Portions created by the Initial Developer are Copyright (C) 2002
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19 | * the Initial Developer. All Rights Reserved.
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20 | *
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21 | * Contributor(s):
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22 | * Darin Fisher <darin@netscape.com>
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23 | *
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24 | * Alternatively, the contents of this file may be used under the terms of
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25 | * either the GNU General Public License Version 2 or later (the "GPL"), or
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26 | * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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27 | * in which case the provisions of the GPL or the LGPL are applicable instead
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28 | * of those above. If you wish to allow use of your version of this file only
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29 | * under the terms of either the GPL or the LGPL, and not to allow others to
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30 | * use your version of this file under the terms of the MPL, indicate your
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31 | * decision by deleting the provisions above and replace them with the notice
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32 | * and other provisions required by the GPL or the LGPL. If you do not delete
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33 | * the provisions above, a recipient may use your version of this file under
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34 | * the terms of any one of the MPL, the GPL or the LGPL.
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35 | *
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36 | * ***** END LICENSE BLOCK ***** */
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37 |
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38 | #ifndef ipcm_h__
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39 | #define ipcm_h__
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40 |
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41 | #include "ipcMessage.h"
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42 | #include "ipcMessagePrimitives.h"
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43 |
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44 | //-----------------------------------------------------------------------------
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45 |
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46 | //
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47 | // IPCM (IPC Manager) protocol support
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48 | //
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49 |
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50 | // The IPCM message target identifier:
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51 | extern const nsID IPCM_TARGET;
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52 |
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53 | //
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54 | // Every IPCM message has the following structure:
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55 | //
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56 | // +-----------------------------------------+
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57 | // | (ipc message header) |
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58 | // +-----------------------------------------+
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59 | // | DWORD : type |
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60 | // +-----------------------------------------+
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61 | // | DWORD : requestIndex |
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62 | // +-----------------------------------------+
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63 | // . .
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64 | // . (payload) .
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65 | // . .
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66 | // +-----------------------------------------+
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67 | //
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68 | // where |type| is an integer uniquely identifying the message. the type is
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69 | // composed of a message class identifier and a message number. there are 3
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70 | // message classes:
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71 | //
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72 | // ACK - acknowledging a request
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73 | // REQ - making a request
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74 | // PSH - providing unrequested, "pushed" information
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75 | //
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76 | // The requestIndex field is initialized when a request is made. An
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77 | // acknowledgement's requestIndex is equal to that of its corresponding
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78 | // request message. This enables the requesting side of the message exchange
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79 | // to match acknowledgements to requests. The requestIndex field is ignored
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80 | // for PSH messages.
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81 | //
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82 |
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83 | // The IPCM message class is stored in the most significant byte.
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84 | #define IPCM_MSG_CLASS_REQ (1 << 24)
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85 | #define IPCM_MSG_CLASS_ACK (2 << 24)
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86 | #define IPCM_MSG_CLASS_PSH (4 << 24)
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87 |
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88 | // Requests
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89 | #define IPCM_MSG_REQ_PING (IPCM_MSG_CLASS_REQ | 1)
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90 | #define IPCM_MSG_REQ_FORWARD (IPCM_MSG_CLASS_REQ | 2)
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91 | #define IPCM_MSG_REQ_CLIENT_HELLO (IPCM_MSG_CLASS_REQ | 3)
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92 | #define IPCM_MSG_REQ_CLIENT_ADD_NAME (IPCM_MSG_CLASS_REQ | 4)
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93 | #define IPCM_MSG_REQ_CLIENT_DEL_NAME (IPCM_MSG_CLASS_REQ | 5)
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94 | #define IPCM_MSG_REQ_CLIENT_ADD_TARGET (IPCM_MSG_CLASS_REQ | 6)
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95 | #define IPCM_MSG_REQ_CLIENT_DEL_TARGET (IPCM_MSG_CLASS_REQ | 7)
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96 | #define IPCM_MSG_REQ_QUERY_CLIENT_BY_NAME (IPCM_MSG_CLASS_REQ | 8)
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97 | #define IPCM_MSG_REQ_QUERY_CLIENT_NAMES (IPCM_MSG_CLASS_REQ | 9) // TODO
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98 | #define IPCM_MSG_REQ_QUERY_CLIENT_TARGETS (IPCM_MSG_CLASS_REQ | 10) // TODO
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99 |
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100 | // Acknowledgements
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101 | #define IPCM_MSG_ACK_RESULT (IPCM_MSG_CLASS_ACK | 1)
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102 | #define IPCM_MSG_ACK_CLIENT_ID (IPCM_MSG_CLASS_ACK | 2)
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103 | #define IPCM_MSG_ACK_CLIENT_NAMES (IPCM_MSG_CLASS_ACK | 3) // TODO
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104 | #define IPCM_MSG_ACK_CLIENT_TARGETS (IPCM_MSG_CLASS_ACK | 4) // TODO
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105 |
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106 | // Push messages
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107 | #define IPCM_MSG_PSH_CLIENT_STATE (IPCM_MSG_CLASS_PSH | 1)
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108 | #define IPCM_MSG_PSH_FORWARD (IPCM_MSG_CLASS_PSH | 2)
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109 |
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110 | //-----------------------------------------------------------------------------
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111 |
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112 | //
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113 | // IPCM header
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114 | //
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115 | struct ipcmMessageHeader
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116 | {
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117 | PRUint32 mType;
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118 | PRUint32 mRequestIndex;
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119 | };
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120 |
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121 | //
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122 | // returns IPCM message type.
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123 | //
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124 | static inline int
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125 | IPCM_GetType(const ipcMessage *msg)
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126 | {
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127 | return ((const ipcmMessageHeader *) msg->Data())->mType;
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128 | }
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129 |
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130 | //
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131 | // return IPCM message request index.
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132 | //
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133 | static inline PRUint32
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134 | IPCM_GetRequestIndex(const ipcMessage *msg)
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135 | {
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136 | return ((const ipcmMessageHeader *) msg->Data())->mRequestIndex;
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137 | }
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138 |
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139 | //
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140 | // return a request index that is unique to this process.
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141 | //
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142 | NS_HIDDEN_(PRUint32)
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143 | IPCM_NewRequestIndex();
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144 |
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145 | //-----------------------------------------------------------------------------
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146 |
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147 | //
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148 | // The IPCM protocol is detailed below:
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149 | //
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150 |
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151 | // REQUESTS
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152 |
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153 | //
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154 | // req: IPCM_MSG_REQ_PING
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155 | // ack: IPCM_MSG_ACK_RESULT
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156 | //
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157 | // A PING can be sent from either a client to the daemon, or from the daemon
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158 | // to a client. The expected acknowledgement is a RESULT message with a status
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159 | // code of 0.
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160 | //
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161 | // This request message has no payload.
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162 | //
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163 |
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164 | //
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165 | // req: IPCM_MSG_REQ_FORWARD
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166 | // ack: IPCM_MSG_ACK_RESULT
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167 | //
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168 | // A FORWARD is sent when a client wishes to send a message to another client.
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169 | // The payload of this message is another message that should be forwarded by
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170 | // the daemon's IPCM to the specified client. The expected acknowledgment is
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171 | // a RESULT message with a status code indicating success or failure.
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172 | //
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173 | // When the daemon receives a FORWARD message, it creates a PSH_FORWARD message
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174 | // and sends that on to the destination client.
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175 | //
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176 | // This request message has as its payload:
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177 | //
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178 | // +-----------------------------------------+
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179 | // | DWORD : clientID |
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180 | // +-----------------------------------------+
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181 | // | (innerMsgHeader) |
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182 | // +-----------------------------------------+
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183 | // | (innerMsgData) |
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184 | // +-----------------------------------------+
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185 | //
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186 |
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187 | //
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188 | // req: IPCM_MSG_REQ_CLIENT_HELLO
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189 | // ack: IPCM_MSG_REQ_CLIENT_ID <or> IPCM_MSG_REQ_RESULT
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190 | //
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191 | // A CLIENT_HELLO is sent when a client connects to the IPC daemon. The
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192 | // expected acknowledgement is a CLIENT_ID message informing the new client of
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193 | // its ClientID. If for some reason the IPC daemon cannot accept the new
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194 | // client, it returns a RESULT message with a failure status code.
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195 | //
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196 | // This request message has no payload.
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197 | //
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198 |
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199 | //
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200 | // req: IPCM_MSG_REQ_CLIENT_ADD_NAME
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201 | // ack: IPCM_MSG_ACK_RESULT
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202 | //
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203 | // A CLIENT_ADD_NAME is sent when a client wishes to register an additional
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204 | // name for itself. The expected acknowledgement is a RESULT message with a
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205 | // status code indicating success or failure.
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206 | //
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207 | // This request message has as its payload a null-terminated ASCII character
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208 | // string indicating the name of the client.
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209 | //
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210 |
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211 | //
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212 | // req: IPCM_MSG_REQ_CLIENT_DEL_NAME
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213 | // ack: IPCM_MSG_ACK_RESULT
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214 | //
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215 | // A CLIENT_DEL_NAME is sent when a client wishes to unregister a name that it
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216 | // has registered. The expected acknowledgement is a RESULT message with a
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217 | // status code indicating success or failure.
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218 | //
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219 | // This request message has as its payload a null-terminated ASCII character
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220 | // string indicating the name of the client.
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221 | //
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222 |
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223 | //
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224 | // req: IPCM_MSG_REQ_CLIENT_ADD_TARGET
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225 | // ack: IPCM_MSG_ACK_RESULT
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226 | //
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227 | // A CLIENT_ADD_TARGET is sent when a client wishes to register an additional
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228 | // target that it supports. The expected acknowledgement is a RESULT message
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229 | // with a status code indicating success or failure.
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230 | //
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231 | // This request message has as its payload a 128-bit UUID indicating the
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232 | // target to add.
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233 | //
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234 |
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235 | //
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236 | // req: IPCM_MSG_REQ_CLIENT_DEL_TARGET
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237 | // ack: IPCM_MSG_ACK_RESULT
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238 | //
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239 | // A CLIENT_DEL_TARGET is sent when a client wishes to unregister a target
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240 | // that it has registered. The expected acknowledgement is a RESULT message
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241 | // with a status code indicating success or failure.
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242 | //
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243 | // This request message has as its payload a 128-bit UUID indicating the
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244 | // target to remove.
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245 | //
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246 |
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247 | //
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248 | // req: IPCM_MSG_REQ_QUERY_CLIENT_BY_NAME
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249 | // ack: IPCM_MSG_ACK_CLIENT_ID <or> IPCM_MSG_ACK_RESULT
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250 | //
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251 | // A QUERY_CLIENT_BY_NAME may be sent by a client to discover the client that
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252 | // is known by a common name. If more than one client matches the name, then
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253 | // only the ID of the more recently registered client is returned. The
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254 | // expected acknowledgement is a CLIENT_ID message carrying the ID of the
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255 | // corresponding client. If no client matches the given name or if some error
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256 | // occurs, then a RESULT message with a failure status code is returned.
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257 | //
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258 | // This request message has as its payload a null-terminated ASCII character
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259 | // string indicating the client name to query.
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260 | //
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261 |
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262 | // ACKNOWLEDGEMENTS
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263 |
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264 | //
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265 | // ack: IPCM_MSG_ACK_RESULT
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266 | //
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267 | // This acknowledgement is returned to indicate a success or failure status.
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268 | //
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269 | // The payload consists of a single DWORD value.
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270 | //
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271 | // Possible status codes are listed below (negative values indicate failure
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272 | // codes):
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273 | //
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274 | #define IPCM_OK 0 // success: generic
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275 | #define IPCM_ERROR_GENERIC -1 // failure: generic
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276 | #define IPCM_ERROR_NO_CLIENT -2 // failure: client does not exist
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277 | #define IPCM_ERROR_INVALID_ARG -3 // failure: invalid request argument
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278 | #define IPCM_ERROR_NO_SUCH_DATA -4 // failure: requested data does not exist
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279 | #define IPCM_ERROR_ALREADY_EXISTS -5 // failure: data to set already exists
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280 |
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281 | //
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282 | // ack: IPCM_MSG_ACK_CLIENT_ID
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283 | //
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284 | // This acknowledgement is returned to specify a client ID.
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285 | //
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286 | // The payload consists of a single DWORD value.
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287 | //
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288 |
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289 | // PUSH MESSAGES
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290 |
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291 | //
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292 | // psh: ICPM_MSG_PSH_CLIENT_STATE
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293 | //
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294 | // This message is sent to clients to indicate the status of other clients.
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295 | //
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296 | // The payload consists of:
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297 | //
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298 | // +-----------------------------------------+
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299 | // | DWORD : clientID |
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300 | // +-----------------------------------------+
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301 | // | DWORD : clientState |
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302 | // +-----------------------------------------+
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303 | //
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304 | // where, clientState is one of the following values indicating whether the
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305 | // client has recently connected (up) or disconnected (down):
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306 | //
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307 | #define IPCM_CLIENT_STATE_UP 1
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308 | #define IPCM_CLIENT_STATE_DOWN 2
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309 |
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310 | //
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311 | // psh: IPCM_MSG_PSH_FORWARD
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312 | //
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313 | // This message is sent by the daemon to a client on behalf of another client.
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314 | // The recipient is expected to unpack the contained message and process it.
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315 | //
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316 | // The payload of this message matches the payload of IPCM_MSG_REQ_FORWARD,
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317 | // with the exception that the clientID field is set to the clientID of the
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318 | // sender of the IPCM_MSG_REQ_FORWARD message.
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319 | //
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320 |
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321 | //-----------------------------------------------------------------------------
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322 |
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323 | //
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324 | // NOTE: This file declares some helper classes that simplify constructing
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325 | // and parsing IPCM messages. Each class subclasses ipcMessage, but
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326 | // adds no additional member variables. |operator new| should be used
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327 | // to allocate one of the IPCM helper classes, e.g.:
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328 | //
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329 | // ipcMessage *msg = new ipcmMessageClientHello("foo");
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330 | //
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331 | // Given an arbitrary ipcMessage, it can be parsed using logic similar
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332 | // to the following:
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333 | //
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334 | // void func(const ipcMessage *unknown)
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335 | // {
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336 | // if (unknown->Topic().Equals(IPCM_TARGET)) {
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337 | // if (IPCM_GetMsgType(unknown) == IPCM_MSG_TYPE_CLIENT_ID) {
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338 | // ipcMessageCast<ipcmMessageClientID> msg(unknown);
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339 | // printf("Client ID: %u\n", msg->ClientID());
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340 | // }
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341 | // }
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342 | // }
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343 | //
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344 |
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345 | // REQUESTS
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346 |
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347 | class ipcmMessagePing : public ipcMessage_DWORD_DWORD
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348 | {
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349 | public:
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350 | ipcmMessagePing()
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351 | : ipcMessage_DWORD_DWORD(
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352 | IPCM_TARGET,
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353 | IPCM_MSG_REQ_PING,
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354 | IPCM_NewRequestIndex()) {}
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355 | };
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356 |
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357 | class ipcmMessageForward : public ipcMessage
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358 | {
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359 | public:
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360 | // @param type the type of this message: IPCM_MSG_{REQ,PSH}_FORWARD
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361 | // @param clientID the client id of the sender or receiver
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362 | // @param target the message target
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363 | // @param data the message data
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364 | // @param dataLen the message data length
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365 | ipcmMessageForward(PRUint32 type,
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366 | PRUint32 clientID,
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367 | const nsID &target,
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368 | const char *data,
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369 | PRUint32 dataLen) NS_HIDDEN;
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370 |
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371 | // set inner message data, constrained to the data length passed
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372 | // to this class's constructor.
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373 | NS_HIDDEN_(void) SetInnerData(PRUint32 offset, const char *data, PRUint32 dataLen);
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374 |
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375 | NS_HIDDEN_(PRUint32) ClientID() const;
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376 | NS_HIDDEN_(const nsID &) InnerTarget() const;
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377 | NS_HIDDEN_(const char *) InnerData() const;
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378 | NS_HIDDEN_(PRUint32) InnerDataLen() const;
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379 | };
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380 |
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381 | class ipcmMessageClientHello : public ipcMessage_DWORD_DWORD
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382 | {
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383 | public:
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384 | ipcmMessageClientHello()
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385 | : ipcMessage_DWORD_DWORD(
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386 | IPCM_TARGET,
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387 | IPCM_MSG_REQ_CLIENT_HELLO,
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388 | IPCM_NewRequestIndex()) {}
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389 | };
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390 |
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391 | class ipcmMessageClientAddName : public ipcMessage_DWORD_DWORD_STR
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392 | {
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393 | public:
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394 | ipcmMessageClientAddName(const char *name)
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395 | : ipcMessage_DWORD_DWORD_STR(
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396 | IPCM_TARGET,
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397 | IPCM_MSG_REQ_CLIENT_ADD_NAME,
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398 | IPCM_NewRequestIndex(),
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399 | name) {}
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400 |
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401 | const char *Name() const { return Third(); }
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402 | };
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403 |
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404 | class ipcmMessageClientDelName : public ipcMessage_DWORD_DWORD_STR
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405 | {
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406 | public:
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407 | ipcmMessageClientDelName(const char *name)
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408 | : ipcMessage_DWORD_DWORD_STR(
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409 | IPCM_TARGET,
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410 | IPCM_MSG_REQ_CLIENT_DEL_NAME,
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411 | IPCM_NewRequestIndex(),
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412 | name) {}
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413 |
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414 | const char *Name() const { return Third(); }
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415 | };
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416 |
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417 | class ipcmMessageClientAddTarget : public ipcMessage_DWORD_DWORD_ID
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418 | {
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419 | public:
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420 | ipcmMessageClientAddTarget(const nsID &target)
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421 | : ipcMessage_DWORD_DWORD_ID(
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422 | IPCM_TARGET,
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423 | IPCM_MSG_REQ_CLIENT_ADD_TARGET,
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424 | IPCM_NewRequestIndex(),
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425 | target) {}
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426 |
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427 | const nsID &Target() const { return Third(); }
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428 | };
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429 |
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430 | class ipcmMessageClientDelTarget : public ipcMessage_DWORD_DWORD_ID
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431 | {
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432 | public:
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433 | ipcmMessageClientDelTarget(const nsID &target)
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434 | : ipcMessage_DWORD_DWORD_ID(
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435 | IPCM_TARGET,
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436 | IPCM_MSG_REQ_CLIENT_ADD_TARGET,
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437 | IPCM_NewRequestIndex(),
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438 | target) {}
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439 |
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440 | const nsID &Target() const { return Third(); }
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441 | };
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442 |
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443 | class ipcmMessageQueryClientByName : public ipcMessage_DWORD_DWORD_STR
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444 | {
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445 | public:
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446 | ipcmMessageQueryClientByName(const char *name)
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447 | : ipcMessage_DWORD_DWORD_STR(
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448 | IPCM_TARGET,
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449 | IPCM_MSG_REQ_QUERY_CLIENT_BY_NAME,
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450 | IPCM_NewRequestIndex(),
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451 | name) {}
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452 |
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453 | const char *Name() const { return Third(); }
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454 | PRUint32 RequestIndex() const { return Second(); }
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455 | };
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456 |
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457 | // ACKNOWLEDGEMENTS
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458 |
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459 | class ipcmMessageResult : public ipcMessage_DWORD_DWORD_DWORD
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460 | {
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461 | public:
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462 | ipcmMessageResult(PRUint32 requestIndex, PRInt32 status)
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463 | : ipcMessage_DWORD_DWORD_DWORD(
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464 | IPCM_TARGET,
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465 | IPCM_MSG_ACK_RESULT,
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466 | requestIndex,
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467 | (PRUint32) status) {}
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468 |
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469 | PRInt32 Status() const { return (PRInt32) Third(); }
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470 | };
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471 |
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472 | class ipcmMessageClientID : public ipcMessage_DWORD_DWORD_DWORD
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473 | {
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474 | public:
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475 | ipcmMessageClientID(PRUint32 requestIndex, PRUint32 clientID)
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476 | : ipcMessage_DWORD_DWORD_DWORD(
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477 | IPCM_TARGET,
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478 | IPCM_MSG_ACK_CLIENT_ID,
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479 | requestIndex,
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480 | clientID) {}
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481 |
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482 | PRUint32 ClientID() const { return Third(); }
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483 | };
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484 |
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485 | // PUSH MESSAGES
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486 |
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487 | class ipcmMessageClientState : public ipcMessage_DWORD_DWORD_DWORD_DWORD
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488 | {
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489 | public:
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490 | ipcmMessageClientState(PRUint32 clientID, PRUint32 clientStatus)
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491 | : ipcMessage_DWORD_DWORD_DWORD_DWORD(
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492 | IPCM_TARGET,
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493 | IPCM_MSG_PSH_CLIENT_STATE,
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494 | 0,
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495 | clientID,
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496 | clientStatus) {}
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497 |
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498 | PRUint32 ClientID() const { return Third(); }
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499 | PRUint32 ClientState() const { return Fourth(); }
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500 | };
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501 |
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502 | #endif // !ipcm_h__
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