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LuaSocket 2.0.2 + CMake build description.
author Eric Wing <ewing . public |-at-| gmail . com>
date Tue, 26 Aug 2008 18:40:01 -0700
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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2 "http://www.w3.org/TR/html4/strict.dtd">
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3 <html>
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4
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5 <head>
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6 <meta name="description" content="LuaSocket: The core namespace">
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7 <meta name="keywords" content="Lua, LuaSocket, Socket, Network, Library, Support">
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8 <title>LuaSocket: The socket namespace</title>
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9 <link rel="stylesheet" href="reference.css" type="text/css">
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10 </head>
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11
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12 <body>
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13
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14 <!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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15
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16 <div class=header>
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17 <hr>
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18 <center>
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19 <table summary="LuaSocket logo">
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20 <tr><td align=center><a href="http://www.lua.org">
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21 <img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
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22 </a></td></tr>
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23 <tr><td align=center valign=top>Network support for the Lua language
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24 </td></tr>
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25 </table>
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26 <p class=bar>
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27 <a href="home.html">home</a> &middot;
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28 <a href="home.html#download">download</a> &middot;
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29 <a href="installation.html">installation</a> &middot;
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30 <a href="introduction.html">introduction</a> &middot;
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31 <a href="reference.html">reference</a>
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32 </p>
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33 </center>
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34 <hr>
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35 </div>
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36
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37 <!-- socket +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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38
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39 <h2 id=socket>The socket namespace</h2>
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40
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41 <p>
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42 The <tt>socket</tt> namespace contains the core functionality of LuaSocket.
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43 </p>
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44
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45 <p>
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46 To obtain the <tt>socket</tt> namespace, run:
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47 </p>
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48
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49 <pre class=example>
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50 -- loads the socket module
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51 local socket = require("socket")
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52 </pre>
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53
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54 <!-- bind ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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55
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56 <p class=name id=bind>
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57 socket.<b>bind(</b>address, port [, backlog]<b>)</b>
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58 </p>
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59
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60 <p class=description>
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61 This function is a shortcut that creates and returns a TCP server object
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62 bound to a local <tt>address</tt> and <tt>port</tt>, ready to
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63 accept client connections. Optionally,
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64 user can also specify the <tt>backlog</tt> argument to the
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65 <a href=tcp.html#listen><tt>listen</tt></a> method (defaults to 32).
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66 </p>
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67
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68 <p class=note>
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69 Note: The server object returned will have the option "<tt>reuseaddr</tt>"
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70 set to <tt><b>true</b></tt>.
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71 </p>
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72
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73 <!-- connect ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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74
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75 <p class=name id=connect>
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76 socket.<b>connect(</b>address, port [, locaddr, locport]<b>)</b>
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77 </p>
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78
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79 <p class=description>
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80 This function is a shortcut that creates and returns a TCP client object
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81 connected to a remote <tt>host</tt> at a given <tt>port</tt>. Optionally,
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82 the user can also specify the local address and port to bind
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83 (<tt>locaddr</tt> and <tt>locport</tt>).
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84 </p>
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85
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86 <!-- debug ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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87
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88 <p class=name id=debug>
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89 socket.<b>_DEBUG</b>
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90 </p>
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91
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92 <p class=description>
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93 This constant is set to <tt><b>true</b></tt> if the library was compiled
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94 with debug support.
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95 </p>
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96
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97 <!-- newtry +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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98
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99 <p class=name id=newtry>
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100 socket.<b>newtry(</b>finalizer<b>)</b>
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101 </p>
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102
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103 <p class=description>
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104 Creates and returns a <em>clean</em>
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105 <a href="#try"><tt>try</tt></a>
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106 function that allows for cleanup before the exception
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107 is raised.
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108 </p>
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109
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110 <p class=parameters>
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111 <tt>Finalizer</tt> is a function that will be called before
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112 <tt>try</tt> throws the exception. It will be called
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113 in <em>protected</em> mode.
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114 </p>
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115
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116 <p class=return>
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117 The function returns your customized <tt>try</tt> function.
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118 </p>
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119
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120 <p class=note>
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121 Note: This idea saved a <em>lot</em> of work with the
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122 implementation of protocols in LuaSocket:
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123 </p>
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124
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125 <pre class=example>
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126 foo = socket.protect(function()
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127 -- connect somewhere
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128 local c = socket.try(socket.connect("somewhere", 42))
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129 -- create a try function that closes 'c' on error
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130 local try = socket.newtry(function() c:close() end)
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131 -- do everything reassured c will be closed
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132 try(c:send("hello there?\r\n"))
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133 local answer = try(c:receive())
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134 ...
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135 try(c:send("good bye\r\n"))
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136 c:close()
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137 end)
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138 </pre>
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139
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140
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141 <!-- protect +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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142
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143 <p class=name id=protect>
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144 socket.<b>protect(</b>func<b>)</b>
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145 </p>
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146
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147 <p class=description>
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148 Converts a function that throws exceptions into a safe function. This
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149 function only catches exceptions thrown by the <a href=#try><tt>try</tt></a>
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150 and <a href=#newtry><tt>newtry</tt></a> functions. It does not catch normal
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151 Lua errors.
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152 </p>
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153
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154 <p class=parameters>
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155 <tt>Func</tt> is a function that calls
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156 <a href=#try><tt>try</tt></a> (or <tt>assert</tt>, or <tt>error</tt>)
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157 to throw exceptions.
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158 </p>
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159
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160 <p class=return>
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161 Returns an equivalent function that instead of throwing exceptions,
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162 returns <tt><b>nil</b></tt> followed by an error message.
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163 </p>
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164
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165 <p class=note>
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166 Note: Beware that if your function performs some illegal operation that
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167 raises an error, the protected function will catch the error and return it
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168 as a string. This is because the <a href=#try><tt>try</tt></a> function
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169 uses errors as the mechanism to throw exceptions.
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170 </p>
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171
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172 <!-- select +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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173
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174 <p class=name id=select>
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175 socket.<b>select(</b>recvt, sendt [, timeout]<b>)</b>
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176 </p>
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177
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178 <p class=description>
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179 Waits for a number of sockets to change status.
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180 </p>
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181
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182 <p class=parameters>
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183 <tt>Recvt</tt> is an array with the sockets to test for characters
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184 available for reading. Sockets in the <tt>sendt</tt> array are watched to
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185 see if it is OK to immediately write on them. <tt>Timeout</tt> is the
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186 maximum amount of time (in seconds) to wait for a change in status. A
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187 <tt><b>nil</b></tt>, negative or omitted <tt>timeout</tt> value allows the
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188 function to block indefinitely. <tt>Recvt</tt> and <tt>sendt</tt> can also
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189 be empty tables or <tt><b>nil</b></tt>. Non-socket values (or values with
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190 non-numeric indices) in the arrays will be silently ignored.
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191 </p>
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192
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193 <p class=return> The function returns a list with the sockets ready for
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194 reading, a list with the sockets ready for writing and an error message.
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195 The error message is "<tt>timeout</tt>" if a timeout condition was met and
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196 <tt><b>nil</b></tt> otherwise. The returned tables are
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197 doubly keyed both by integers and also by the sockets
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198 themselves, to simplify the test if a specific socket has
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199 changed status.
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200 </p>
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201
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202 <p class=note>
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203 <b>Important note</b>: a known bug in WinSock causes <tt>select</tt> to fail
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204 on non-blocking TCP sockets. The function may return a socket as
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205 writable even though the socket is <em>not</em> ready for sending.
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206 </p>
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207
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208 <p class=note>
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209 <b>Another important note</b>: calling select with a server socket in the receive parameter before a call to accept does <em>not</em> guarantee
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210 <a href=tcp.html#accept><tt>accept</tt></a> will return immediately.
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211 Use the <a href=tcp.html#settimeout><tt>settimeout</tt></a>
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212 method or <tt>accept</tt> might block forever.
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213 </p>
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214
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215 <p class=note>
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216 <b>Yet another note</b>: If you close a socket and pass
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217 it to <tt>select</tt>, it will be ignored.
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218 </p>
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219
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220 <!-- sink ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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221
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222 <p class=name id=sink>
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223 socket.<b>sink(</b>mode, socket<b>)</b>
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224 </p>
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225
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226 <p class=description>
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227 Creates an
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228 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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229 sink from a stream socket object.
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230 </p>
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231
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232 <p class=parameters>
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233 <tt>Mode</tt> defines the behavior of the sink. The following
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234 options are available:
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235 </p>
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236 <ul>
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237 <li> <tt>"http-chunked"</tt>: sends data through socket after applying the
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238 <em>chunked transfer coding</em>, closing the socket when done;
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239 <li> <tt>"close-when-done"</tt>: sends all received data through the
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240 socket, closing the socket when done;
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241 <li> <tt>"keep-open"</tt>: sends all received data through the
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242 socket, leaving it open when done.
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243 </ul>
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244 <p>
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245 <tt>Socket</tt> is the stream socket object used to send the data.
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246 </p>
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247
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248 <p class=return>
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249 The function returns a sink with the appropriate behavior.
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250 </p>
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251
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252 <!-- skip ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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253
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254 <p class=name id=skip>
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255 socket.<b>skip(</b>d [, ret<sub>1</sub>, ret<sub>2</sub> ... ret<sub>N</sub>]<b>)</b>
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256 </p>
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257
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258 <p class=description>
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259 Drops a number of arguments and returns the remaining.
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260 </p>
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261
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262 <p class=parameters>
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263 <tt>D</tt> is the number of arguments to drop. <tt>Ret<sub>1</sub></tt> to
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264 <tt>ret<sub>N</sub></tt> are the arguments.
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265 </p>
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266
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267 <p class=return>
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268 The function returns <tt>ret<sub>d+1</sub></tt> to <tt>ret<sub>N</sub></tt>.
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269 </p>
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270
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271 <p class=note>
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272 Note: This function is useful to avoid creation of dummy variables:
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273 </p>
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274
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275 <pre class=example>
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276 -- get the status code and separator from SMTP server reply
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277 local code, sep = socket.skip(2, string.find(line, "^(%d%d%d)(.?)"))
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278 </pre>
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279
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280 <!-- sleep ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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281
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282 <p class=name id=sleep>
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283 socket.<b>sleep(</b>time<b>)</b>
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284 </p>
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285
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286 <p class=description>
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287 Freezes the program execution during a given amount of time.
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288 </p>
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289
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290 <p class=parameters>
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291 <tt>Time</tt> is the number of seconds to sleep for.
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292 </p>
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293
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294 <!-- source +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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295
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296 <p class=name id=source>
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297 socket.<b>source(</b>mode, socket [, length]<b>)</b>
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298 </p>
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299
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300 <p class=description>
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301 Creates an
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302 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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303 source from a stream socket object.
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304 </p>
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305
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306 <p class=parameters>
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307 <tt>Mode</tt> defines the behavior of the source. The following
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308 options are available:
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309 </p>
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310 <ul>
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311 <li> <tt>"http-chunked"</tt>: receives data from socket and removes the
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312 <em>chunked transfer coding</em> before returning the data;
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313 <li> <tt>"by-length"</tt>: receives a fixed number of bytes from the
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314 socket. This mode requires the extra argument <tt>length</tt>;
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315 <li> <tt>"until-closed"</tt>: receives data from a socket until the other
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316 side closes the connection.
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317 </ul>
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318 <p>
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319 <tt>Socket</tt> is the stream socket object used to receive the data.
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320 </p>
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321
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322 <p class=return>
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323 The function returns a source with the appropriate behavior.
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324 </p>
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325
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326 <!-- time ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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327
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328 <p class=name id=gettime>
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329 socket.<b>gettime()</b>
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330 </p>
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331
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332 <p class=description>
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333 Returns the time in seconds, relative to the origin of the
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334 universe. You should subtract the values returned by this function
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335 to get meaningful values.
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336 </p>
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337
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338 <pre class=example>
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339 t = socket.gettime()
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340 -- do stuff
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341 print(socket.gettime() - t .. " seconds elapsed")
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342 </pre>
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343
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344 <!-- try ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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345
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346 <p class=name id=try>
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347 socket.<b>try(</b>ret<sub>1</sub> [, ret<sub>2</sub> ... ret<sub>N</sub>]<b>)</b>
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348 </p>
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349
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350 <p class=description>
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351 Throws an exception in case of error. The exception can only be caught
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352 by the <a href=#protect><tt>protect</tt></a> function. It does not explode
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353 into an error message.
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354 </p>
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355
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356 <p class=parameters>
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357 <tt>Ret<sub>1</sub></tt> to <tt>ret<sub>N</sub></tt> can be arbitrary
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358 arguments, but are usually the return values of a function call
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359 nested with <tt>try</tt>.
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360 </p>
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361
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362 <p class=return>
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363 The function returns <tt>ret</tt><sub>1</sub> to <tt>ret</tt><sub>N</sub> if
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364 <tt>ret</tt><sub>1</sub> is not <tt><b>nil</b></tt>. Otherwise, it calls <tt>error</tt> passing <tt>ret</tt><sub>2</sub>.
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365 </p>
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366
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367 <pre class=example>
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368 -- connects or throws an exception with the appropriate error message
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369 c = socket.try(socket.connect("localhost", 80))
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370 </pre>
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371
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372 <!-- version ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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373
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374 <p class=name id=version>
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375 socket.<b>_VERSION</b>
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376 </p>
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377
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378 <p class=description>
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379 This constant has a string describing the current LuaSocket version.
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380 </p>
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381
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382 <!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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383
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384 <div class=footer>
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