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162 lines
5.1 KiB
HTML
162 lines
5.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta name="description" content="LuaSocket: Introduction to the core">
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<meta name="keywords" content="Lua, LuaSocket, TCP, UDP, Network, Support,
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Installation">
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<title>LuaSocket: Installation</title>
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<link rel="stylesheet" href="reference.css" type="text/css">
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</head>
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<body>
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<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=header>
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<hr>
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<center>
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<table summary="LuaSocket logo">
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<tr><td align=center><a href="http://www.lua.org">
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<img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
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</a></td></tr>
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<tr><td align=center valign=top>Network support for the Lua language
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</td></tr>
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</table>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#download">download</a> ·
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<a href="installation.html">installation</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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</center>
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<hr>
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</div>
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<!-- installation ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2>Installation</h2>
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<p> LuaSocket 2.0 uses the new package proposal for Lua 5.1.
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All Lua library developers are encouraged to update their libraries so that
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all libraries can coexist peacefully and users can benefit from the
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standardization and flexibility of the standard.
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</p>
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<p>
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The proposal was considered important enough by some of us to justify
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early adoption, even before release of Lua 5.1.
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Thus, a compatibility module
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<a href=http://www.keplerproject.org/compat/>compat-5.1</a>
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has been released in conjunction with Roberto Ierusalimschy and <a
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href=http://www.keplerproject.org/>The Kepler Project</a> team.
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It implements the Lua 5.1 package proposal on top of Lua 5.0. </p>
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<p> As far as LuaSocket is concerned, this means that whoever is
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deploying a non-standard distribution of LuaSocket will probably
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have no problems customizing it. Here we will only describe the standard distribution. If the standard doesn't meet your
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needs, we refer you to the Lua discussion list, where any question about
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the package scheme will likely already have been answered.
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</p>
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<h3>Directory structure</h3>
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<p> On Unix systems, the standard distribution uses two base
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directories, one for system dependent files, and another for system
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independent files. Let's call these directories <tt><CDIR></tt>
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and <tt><LDIR></tt>, respectively.
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For instance, in my laptop, I use '<tt>/usr/local/lib/lua/5.0</tt>' for
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<tt><CDIR></tt> and '<tt>/usr/local/share/lua/5.0</tt>' for
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<tt><LDIR></tt>. On Windows, sometimes only one directory is used, say
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'<tt>c:\program files\lua\5.0</tt>'. Here is the standard LuaSocket
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distribution directory structure:</p>
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<pre class=example>
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<LDIR>/compat-5.1.lua
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<LDIR>/ltn12.lua
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<LDIR>/socket.lua
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<CDIR>/socket/core.dll
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<LDIR>/socket/http.lua
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<LDIR>/socket/tp.lua
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<LDIR>/socket/ftp.lua
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<LDIR>/socket/smtp.lua
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<LDIR>/socket/url.lua
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<LDIR>/mime.lua
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<CDIR>/mime/core.dll
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</pre>
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<p> Naturally, on Unix systems, <tt>core.dll</tt>
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would be replaced by <tt>core.so</tt>.
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</p>
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<p> In order for the interpreter to find all LuaSocket components, three
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environment variables need to be set. The first environment variable tells
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the interpreter to load the <tt>compat-5.1.lua</tt> module at startup: </p>
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<pre class=example>
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LUA_INIT=@<LDIR>/compat-5.1.lua
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</pre>
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<p>
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The other two environment variables instruct the compatibility module to
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look for dynamic libraries and extension modules in the appropriate
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directories and with the appropriate filename extensions.
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</p>
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<pre class=example>
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LUA_PATH=<LDIR>/?.lua;?.lua
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LUA_CPATH=<CDIR>/?.dll;?.dll
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</pre>
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<p> Again, naturally, on Unix systems the shared library extension would be
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<tt>.so</tt> instead of <tt>.dll</tt>.</p>
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<h3>Using LuaSocket</h3>
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<p> With the above setup, and an interpreter with shared library support,
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it should be easy to use LuaSocket. Just fire the interpreter and use the
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<tt>require</tt> function to gain access to whatever module you need:</p>
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<pre class=example>
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Lua 5.0.2 Copyright (C) 1994-2004 Tecgraf, PUC-Rio
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> socket = require("socket")
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> print(socket._VERSION)
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--> LuaSocket 2.0
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</pre>
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<p> Each module loads their dependencies automatically, so you only need to
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load the modules you directly depend upon: </p>
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<pre class=example>
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Lua 5.0.2 Copyright (C) 1994-2004 Tecgraf, PUC-Rio
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> http = require("socket.http")
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> print(http.request("http://www.cs.princeton.edu/~diego/professional/luasocket"))
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--> homepage gets dumped to terminal
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</pre>
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<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=footer>
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<hr>
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<center>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#down">download</a> ·
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<a href="installation.html">installation</a> ·
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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<p>
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<small>
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Last modified by Diego Nehab on <br>
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Mon Nov 21 01:57:22 EST 2005
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</small>
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</p>
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</center>
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</div>
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</body>
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</html>
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