410 lines
24 KiB
HTML
410 lines
24 KiB
HTML
<?xml version="1.0" encoding="utf-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.3.9: http://docutils.sourceforge.net/" />
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<title>libtorrent manual</title>
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<meta name="author" content="Arvid Norberg, arvid@rasterbar.com" />
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<link rel="stylesheet" href="style.css" type="text/css" />
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</head>
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<body>
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<div class="document" id="libtorrent-manual">
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<h1 class="title">libtorrent manual</h1>
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<table class="docinfo" frame="void" rules="none">
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<col class="docinfo-name" />
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<col class="docinfo-content" />
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<tbody valign="top">
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<tr><th class="docinfo-name">Author:</th>
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<td>Arvid Norberg, <a class="last reference" href="mailto:arvid@rasterbar.com">arvid@rasterbar.com</a></td></tr>
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</tbody>
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</table>
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<div class="contents topic" id="table-of-contents">
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<p class="topic-title first"><a name="table-of-contents">Table of contents</a></p>
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<ul class="simple">
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<li><a class="reference" href="#downloading-and-building" id="id6" name="id6">downloading and building</a><ul>
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<li><a class="reference" href="#building-with-bbv2" id="id7" name="id7">building with BBv2</a></li>
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<li><a class="reference" href="#building-with-autotools" id="id8" name="id8">building with autotools</a></li>
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<li><a class="reference" href="#building-with-other-build-systems" id="id9" name="id9">building with other build systems</a></li>
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<li><a class="reference" href="#build-configurations" id="id10" name="id10">build configurations</a></li>
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</ul>
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</li>
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</ul>
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</div>
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<div class="section" id="downloading-and-building">
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<h1><a name="downloading-and-building">downloading and building</a></h1>
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<p>To acquire the latest version of libtorrent, you'll have to grab it from CVS.
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You'll find instructions on how to do this <a class="reference" href="http://sourceforge.net/cvs/?group_id=79942">here</a> (see Anonymous CVS access).</p>
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<p>The build systems supported "out of the box" in libtorrent are boost-build v2
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(BBv2) and autotools (for unix-like systems). If you still can't build after
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following these instructions, you can usually get help in the <tt class="docutils literal"><span class="pre">#libtorrent</span></tt>
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IRC channel on <tt class="docutils literal"><span class="pre">irc.freenode.net</span></tt>.</p>
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<div class="section" id="building-with-bbv2">
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<h2><a name="building-with-bbv2">building with BBv2</a></h2>
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<p>The primary reason to use boost-build is that it will automatically build the
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dependent boost libraries with the correct compiler settings, in order to
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ensure that the build targets are link compatible (see <a class="reference" href="http://boost.org/more/separate_compilation.html">boost guidelines</a>
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for some details on this issue).</p>
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<p>Since BBv2 will build the boost libraries for you, you need the full boost
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source package. Having boost installed via some package system is usually not
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enough (and even if it is enough, the necessary environment variables are
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usually not set by the package installer).</p>
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<div class="section" id="step-1-download-boost">
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<h3><a name="step-1-download-boost">Step 1: Download boost</a></h3>
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<p>You'll find boost <a class="reference" href="http://sourceforge.net/project/showfiles.php?group_id=7586&package_id=8041&release_id=376197">here</a>.</p>
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<p>Extract the archive to some directory where you want it. For the sake of this
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guide, let's assume you extract the package to <tt class="docutils literal"><span class="pre">c:\boost_1_33_1</span></tt> (I'm using
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a windows path in this example since if you're on linux/unix you're more likely
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to use the autotools). You'll need at least version 1.32 of the boost library
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in order to build libtorrent.</p>
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<p>If you use 1.32, you need to download BBv2 separately, so for now, let's
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assume you will use version 1.33.1.</p>
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</div>
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<div class="section" id="step-2-setup-bbv2">
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<h3><a name="step-2-setup-bbv2">Step 2: Setup BBv2</a></h3>
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<p>First you need to build <tt class="docutils literal"><span class="pre">bjam</span></tt>. You do this by opening a terminal (In
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windows, run <tt class="docutils literal"><span class="pre">cmd</span></tt>). Change directory to
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<tt class="docutils literal"><span class="pre">c:\boost_1_33_1\tools\build\jam_src</span></tt>. Then run the script called
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<tt class="docutils literal"><span class="pre">build.bat</span></tt> or <tt class="docutils literal"><span class="pre">build.sh</span></tt> on a unix system. This will build <tt class="docutils literal"><span class="pre">bjam</span></tt> and
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place it in a directory starting with <tt class="docutils literal"><span class="pre">bin.</span></tt> and then have the name of your
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platform. Copy the <tt class="docutils literal"><span class="pre">bjam.exe</span></tt> (or <tt class="docutils literal"><span class="pre">bjam</span></tt> on a unix system) to a place
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that's in you shell's <tt class="docutils literal"><span class="pre">PATH</span></tt>. On linux systems a place commonly used may be
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<tt class="docutils literal"><span class="pre">/usr/local/bin</span></tt> or on windows <tt class="docutils literal"><span class="pre">c:\windows</span></tt> (you can also add directories
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to the search paths by modifying the environment variable called <tt class="docutils literal"><span class="pre">PATH</span></tt>).</p>
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<p>Now you have <tt class="docutils literal"><span class="pre">bjam</span></tt> installed. <tt class="docutils literal"><span class="pre">bjam</span></tt> can be considered an interpreter
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that the boost-build system is implemented on. So boost-build uses <tt class="docutils literal"><span class="pre">bjam</span></tt>.
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So, to complete the installation you need to make two more things. You need to
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set the environment variable <tt class="docutils literal"><span class="pre">BOOST_BUILD_PATH</span></tt>. This is the path that tells
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<tt class="docutils literal"><span class="pre">bjam</span></tt> where it can find boost-build, your configuration file and all the
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toolsets (descriptions used by boost-build to know how to use different
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compilers on different platforms). Assuming the boost install path above, set
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it to <tt class="docutils literal"><span class="pre">c:\boost_1_33_1\tools\build\v2</span></tt>.</p>
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<p>To set an environment variable in windows, type for example:</p>
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<pre class="literal-block">
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set BOOST_BUILD_PATH=c:\boost_1_33_1\tools\build\v2
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</pre>
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<p>In a terminal window.</p>
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<p>The last thing to do to complete the setup of BBv2 is to modify your
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<tt class="docutils literal"><span class="pre">user-config.jam</span></tt> file. It is located in <tt class="docutils literal"><span class="pre">c:\boost_1_33_1\tools\build\v2</span></tt>.
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Depending on your platform and which compiler you're using, you should add a
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line for each compiler and compiler version you have installed on your system
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that you want to be able to use with BBv2. For example, if you're using
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Microsoft Visual Studio 7.1 (2003), just add a line:</p>
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<pre class="literal-block">
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using msvc : 7.1 ;
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</pre>
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<p>If you use GCC, add the line:</p>
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<pre class="literal-block">
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using gcc ;
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</pre>
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<p>If you have more than one version of GCC installed, you can add the
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commandline used to invoke g++ after the version number, like this:</p>
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<pre class="literal-block">
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using gcc : 3.3 : g++-3.3 ;
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using gcc : 4.0 : g++-4.0 ;
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</pre>
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<p>Another toolset worth mentioning is the <tt class="docutils literal"><span class="pre">darwin</span></tt> toolset (For MacOS X).
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From Tiger (10.4) MacOS X comes with both GCC 3.3 and GCC 4.0. Then you can
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use the following toolsets:</p>
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<pre class="literal-block">
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using darwin : 3.3 : g++-3.3 ;
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using darwin : 4.0 : g++-4.0 ;
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</pre>
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<p>Note that the spaces around the semi-colons and colons are important!</p>
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<p>Also see the <a class="reference" href="http://www.boost.org/doc/html/bbv2/installation.html">official installation instructions</a>.</p>
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</div>
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<div class="section" id="step-3-building-libtorrent">
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<h3><a name="step-3-building-libtorrent">Step 3: Building libtorrent</a></h3>
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<p>When building libtorrent, the <tt class="docutils literal"><span class="pre">Jamfile</span></tt> expects the environment variable
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<tt class="docutils literal"><span class="pre">BOOST_ROOT</span></tt> to be set to the boost installation directory. It uses this to
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find the boost libraries it depends on, so they can be built and their headers
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files found. So, set this to <tt class="docutils literal"><span class="pre">c:\boost_1_33_1</span></tt>.</p>
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<p>Then the only thing left is simply to invoke <tt class="docutils literal"><span class="pre">bjam</span></tt>. If you want to specify
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a specific toolset to use (compiler) you can just add that to the commandline.
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For example:</p>
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<pre class="literal-block">
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bjam msvc-7.1 link=static
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bjam gcc-3.3 link=static
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bjam darwin-4.0 link=static
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</pre>
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<p>To build different versions you can also just add the name of the build
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variant. Some default build variants in BBv2 are <tt class="docutils literal"><span class="pre">release</span></tt>, <tt class="docutils literal"><span class="pre">debug</span></tt>,
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<tt class="docutils literal"><span class="pre">profile</span></tt>.</p>
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<p>You can build libtorrent as a dll too, by typing <tt class="docutils literal"><span class="pre">link=shared</span></tt>, or
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<tt class="docutils literal"><span class="pre">link=static</span></tt> to build a static library. <tt class="docutils literal"><span class="pre">link=shared</span></tt> is the default.</p>
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<p>If you want to explicitly say how to link against the runtime library, you
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can set the <tt class="docutils literal"><span class="pre">runtime-link</span></tt> feature on the commandline, either to <tt class="docutils literal"><span class="pre">shared</span></tt>
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or <tt class="docutils literal"><span class="pre">static</span></tt>. Most operating systems will only allow linking shared against
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the runtime, but on windows you can do both. Example:</p>
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<pre class="literal-block">
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bjam msvc-7.1 link=static runtime-link=static
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</pre>
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<div class="warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">If you link statically to the runtime library, you cannot build libtorrent
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as a shared library (DLL), since you will get separate heaps in the library
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and in the client application. It will result in crashes and possibly link
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errors.</p>
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</div>
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<p>The build targets are put in a directory called bin, and under it they are
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sorted in directories depending on the toolset and build variant used.</p>
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<p>To build the examples, just change directory to the examples directory and
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invoke <tt class="docutils literal"><span class="pre">bjam</span></tt> from there. To build and run the tests, go to the test
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directory and run <tt class="docutils literal"><span class="pre">bjam</span></tt>.</p>
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<p>Note that if you're building on windows using the <tt class="docutils literal"><span class="pre">msvc</span></tt> toolset, you cannot run it
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from a cygwin terminal, you'll have to run it from a <tt class="docutils literal"><span class="pre">cmd</span></tt> terminal. The same goes for
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cygwin, if you're building with gcc in cygwin you'll have to run it from a cygwin terminal.
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Also, make sure the paths are correct in the different environments. In cygwin, the paths
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(<tt class="docutils literal"><span class="pre">BOOST_BUILD_PATH</span></tt> and <tt class="docutils literal"><span class="pre">BOOST_ROOT</span></tt>) should be in the typical unix-format (e.g.
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<tt class="docutils literal"><span class="pre">/cygdrive/c/boost_1_33_1</span></tt>). In the windows environment, they should have the typical
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windows format (<tt class="docutils literal"><span class="pre">c:/boost_1_33_1</span></tt>).</p>
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<p>The <tt class="docutils literal"><span class="pre">Jamfile</span></tt> will define <tt class="docutils literal"><span class="pre">NDEBUG</span></tt> when it's building a release build.
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For more build configuration flags see <a class="reference" href="#build-configurations">Build configurations</a>.</p>
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<p>Build features:</p>
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<table border="1" class="docutils">
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<colgroup>
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<col width="32%" />
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<col width="68%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">boost build feature</th>
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<th class="head">values</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="docutils literal"><span class="pre">logging</span></tt></td>
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<td><ul class="first last simple">
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<li><tt class="docutils literal"><span class="pre">none</span></tt> - no logging.</li>
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<li><tt class="docutils literal"><span class="pre">default</span></tt> - basic session logging.</li>
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<li><tt class="docutils literal"><span class="pre">verbose</span></tt> - verbose peer wire logging.</li>
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</ul>
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</td>
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</tr>
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<tr><td><tt class="docutils literal"><span class="pre">dht-support</span></tt></td>
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<td><ul class="first last simple">
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<li><tt class="docutils literal"><span class="pre">on</span></tt> - build with support for tracker less
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torrents and DHT support.</li>
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<li><tt class="docutils literal"><span class="pre">logging</span></tt> - build with DHT support and verbose
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logging of the DHT protocol traffic.</li>
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<li><tt class="docutils literal"><span class="pre">off</span></tt> - build without DHT support.</li>
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</ul>
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</td>
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</tr>
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</tbody>
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</table>
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<p>The logs created when building vlog or log mode are put in a directory called
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<tt class="docutils literal"><span class="pre">libtorrent_logs</span></tt> in the current working directory.</p>
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<p>When building the example client on windows, you need to build with
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<tt class="docutils literal"><span class="pre">link=static</span></tt> otherwise you may get unresolved external symbols for some
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boost.program-options symbols.</p>
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<p>For more information, see the <a class="reference" href="http://www.boost.org/tools/build/v2/index.html">Boost build v2 documentation</a>.</p>
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<p>To build all possible variants of libtorrent (good for testing when making
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sure all build variants will actually compile), you can invoke this command:</p>
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<pre class="literal-block">
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bjam debug release link=shared link=static logging=verbose logging=default \
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logging=none dht-support=on dht-support=logging dht-support=off
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</pre>
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</div>
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</div>
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<div class="section" id="building-with-autotools">
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<h2><a name="building-with-autotools">building with autotools</a></h2>
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<p>First of all, you need to install <tt class="docutils literal"><span class="pre">automake</span></tt> and <tt class="docutils literal"><span class="pre">autoconf</span></tt>. Many
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unix/linux systems comes with these preinstalled.</p>
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<div class="section" id="step-1-generating-the-build-system">
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<h3><a name="step-1-generating-the-build-system">Step 1: Generating the build system</a></h3>
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<p>No build system is present if libtorrent is checked out from CVS - it
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needs to be generated first. If you're building from a released tarball,
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you may skip directly to <a class="reference" href="#step-2-running-configure">Step 2: Running configure</a>.</p>
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<p>Execute the following commands, in the given order, to generate
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the build system:</p>
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<ul class="simple">
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<li>aclocal -I m4</li>
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<li>autoheader</li>
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<li>libtoolize --copy --force</li>
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<li>automake --add-missing --copy --gnu</li>
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<li>autoconf</li>
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</ul>
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</div>
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<div class="section" id="step-2-running-configure">
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<h3><a name="step-2-running-configure">Step 2: Running configure</a></h3>
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<p>In your shell, change directory to the libtorrent directory and run
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<tt class="docutils literal"><span class="pre">./configure</span></tt>. This will look for libraries and C++ features that libtorrent
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is dependent on. If something is missing or can't be found it will print an
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error telling you what failed.</p>
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<p>The most likely problem you may encounter is that the configure script won't
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find the boost libraries. Make sure you have boost installed on your system.
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The easiest way to install boost is usually to use the preferred package
|
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system on your platform. Usually libraries and headers are installed in
|
|
standard directories where the compiler will find them, but sometimes that
|
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may not be the case. For example when installing boost on darwin using
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darwinports (the package system based on BSD ports) all libraries are
|
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installed to <tt class="docutils literal"><span class="pre">/opt/local/lib</span></tt> and headers are installed to
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<tt class="docutils literal"><span class="pre">/opt/local/include</span></tt>. By default the compiler will not look in these
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directories. You have to set the enviornment variables <tt class="docutils literal"><span class="pre">LDFLAGS</span></tt> and
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<tt class="docutils literal"><span class="pre">CXXFLAGS</span></tt> in order to make the compiler find those libs. In this example
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you'd set them like this:</p>
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<pre class="literal-block">
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export LDFLAGS=-L/opt/local/lib
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export CXXFLAGS=-I/opt/local/include
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</pre>
|
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<p>It was observed on FreeBSD (release 6.0) that one needs to add '-lpthread' to
|
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LDFLAGS, as Boost::Thread detection will fail without it, even if
|
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Boost::Thread is installed.</p>
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<p>If you need to set these variables, it may be a good idea to add those lines
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to your <tt class="docutils literal"><span class="pre">~/.profile</span></tt> or <tt class="docutils literal"><span class="pre">~/.tcshrc</span></tt> depending on your shell.</p>
|
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<p>You know that the boost libraries were found if you see the following output
|
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from the configure script:</p>
|
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<pre class="literal-block">
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checking whether the Boost::DateTime library is available... yes
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checking for main in -lboost_date_time... yes
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checking whether the Boost::Filesystem library is available... yes
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checking for main in -lboost_filesystem... yes
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checking whether the Boost::Thread library is available... yes
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checking for main in -lboost_thread... yes
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</pre>
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<p>Another possible source of problems may be if the path to your libtorrent
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directory contains spaces. Make sure you either rename the directories with
|
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spaces in their names to remove the spaces or move the libtorrent directory.</p>
|
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</div>
|
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<div class="section" id="creating-a-debug-build">
|
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<h3><a name="creating-a-debug-build">Creating a debug build</a></h3>
|
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<p>To tell configure to build a debug version (with debug info, asserts
|
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and invariant checks enabled), you have to run the configure script
|
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with the following option:</p>
|
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<pre class="literal-block">
|
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./configure --enable-debug=yes
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</pre>
|
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</div>
|
|
<div class="section" id="creating-a-release-build">
|
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<h3><a name="creating-a-release-build">Creating a release build</a></h3>
|
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<p>To tell the configure to build a release version (without debug info,
|
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asserts and invariant checks), you have to run the configure script
|
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with the following option:</p>
|
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<pre class="literal-block">
|
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./configure --enable-debug=no
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</pre>
|
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<p>The above option make use of -DNDEBUG, which is used throughout libtorrent.</p>
|
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</div>
|
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<div class="section" id="id5">
|
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<h3><a name="id5">Step 3: Building libtorrent</a></h3>
|
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<p>Once the configure script is run successfully, you just type <tt class="docutils literal"><span class="pre">make</span></tt> and
|
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libtorrent, the examples and the tests will be built.</p>
|
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<p>When libtorrent is built it may be a good idea to run the tests, you do this
|
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by running <tt class="docutils literal"><span class="pre">make</span> <span class="pre">check</span></tt>.</p>
|
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<p>If you want to build a release version (without debug info, asserts and
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invariant checks), you have to rerun the configure script and rebuild, like this:</p>
|
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<pre class="literal-block">
|
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./configure --disable-debug
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make clean
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make
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</pre>
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</div>
|
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</div>
|
|
<div class="section" id="building-with-other-build-systems">
|
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<h2><a name="building-with-other-build-systems">building with other build systems</a></h2>
|
|
<p>If you're making your own project file, note that there are two versions of
|
|
the file abstraction. There's one <tt class="docutils literal"><span class="pre">file_win.cpp</span></tt> which relies on windows
|
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file API that supports files larger than 2 Gigabytes. This does not work in
|
|
vc6 for some reason, possibly because it may require windows NT and above.
|
|
The other file, <tt class="docutils literal"><span class="pre">file.cpp</span></tt> is the default implementation that simply relies
|
|
on the standard low level io routines (<tt class="docutils literal"><span class="pre">read()</span></tt>, <tt class="docutils literal"><span class="pre">write()</span></tt>, <tt class="docutils literal"><span class="pre">open()</span></tt>
|
|
etc.), this implementation doesn't do anything special to support unicode
|
|
filenames, so if your target is Windows 2000 and up, you may want to use
|
|
<tt class="docutils literal"><span class="pre">file_win.cpp</span></tt> which supports unicode filenames.</p>
|
|
<p>If you're building in MS Visual Studio, you may have to set the compiler
|
|
options "force conformance in for loop scope", "treat wchar_t as built-in
|
|
type" and "Enable Run-Time Type Info" to Yes. For a detailed description
|
|
on how to build libtorrent with VS 2005, see <a class="reference" href="vs2005_build_notes.html">this document</a>.</p>
|
|
</div>
|
|
<div class="section" id="build-configurations">
|
|
<h2><a name="build-configurations">build configurations</a></h2>
|
|
<p>By default libtorrent is built In debug mode, and will have pretty expensive
|
|
invariant checks and asserts built into it. If you want to disable such checks
|
|
(you want to do that in a release build) you can see the table below for which
|
|
defines you can use to control the build.</p>
|
|
<table border="1" class="docutils">
|
|
<colgroup>
|
|
<col width="40%" />
|
|
<col width="60%" />
|
|
</colgroup>
|
|
<thead valign="bottom">
|
|
<tr><th class="head">macro</th>
|
|
<th class="head">description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody valign="top">
|
|
<tr><td><tt class="docutils literal"><span class="pre">NDEBUG</span></tt></td>
|
|
<td>If you define this macro, all asserts,
|
|
invariant checks and general debug code will be
|
|
removed. This option takes precedence over
|
|
other debug settings.</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">TORRENT_LOGGING</span></tt></td>
|
|
<td>This macro will enable logging of the session
|
|
events, such as tracker announces and incoming
|
|
connections (as well as blocked connections).</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">TORRENT_VERBOSE_LOGGING</span></tt></td>
|
|
<td>If you define this macro, every peer connection
|
|
will log its traffic to a log file as well as
|
|
the session log.</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">TORRENT_STORAGE_DEBUG</span></tt></td>
|
|
<td>This will enable extra expensive invariant
|
|
checks in the storage, including logging of
|
|
piece sorting.</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">UNICODE</span></tt></td>
|
|
<td>If building on windows this will make sure the
|
|
UTF-8 strings in pathnames are converted into
|
|
UTF-16 before they are passed to the file
|
|
operations.</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">LITTLE_ENDIAN</span></tt></td>
|
|
<td>This will use the little endian version of the
|
|
sha-1 code. If defined on a big-endian system
|
|
the sha-1 hashes will be incorrect and fail.
|
|
If it is not defined and <tt class="docutils literal"><span class="pre">__BIG_ENDIAN__</span></tt>
|
|
isn't defined either (it is defined by Apple's
|
|
GCC) both little-endian and big-endian versions
|
|
will be built and the correct code will be
|
|
chosen at run-time.</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">TORRENT_LINKING_SHARED</span></tt></td>
|
|
<td>If this is defined when including the
|
|
libtorrent headers, the classes and functions
|
|
will be tagged with <tt class="docutils literal"><span class="pre">__declspec(dllimport)</span></tt>
|
|
on msvc and default visibility on GCC 4 and
|
|
later. Set this in your project if you're
|
|
linking against libtorrent as a shared library.
|
|
(This is set by the Jamfile when
|
|
<tt class="docutils literal"><span class="pre">link=shared</span></tt> is set).</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">TORRENT_BUILDING_SHARED</span></tt></td>
|
|
<td>If this is defined, the functions and classes
|
|
in libtorrent are marked with
|
|
<tt class="docutils literal"><span class="pre">__declspec(dllexport)</span></tt> on msvc, or with
|
|
default visibility on GCC 4 and later. This
|
|
should be defined when building libtorrent as
|
|
a shared library. (This is set by the Jamfile
|
|
when <tt class="docutils literal"><span class="pre">link=shared</span></tt> is set).</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">TORRENT_DISABLE_DHT</span></tt></td>
|
|
<td>If this is defined, the support for trackerless
|
|
torrents will be disabled.</td>
|
|
</tr>
|
|
<tr><td><tt class="docutils literal"><span class="pre">TORRENT_DHT_VERBOSE_LOGGING</span></tt></td>
|
|
<td>This will enable verbose logging of the DHT
|
|
protocol traffic.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>If you experience that libtorrent uses unreasonable amounts of cpu, it will
|
|
definitely help to define <tt class="docutils literal"><span class="pre">NDEBUG</span></tt>, since it will remove the invariant checks
|
|
within the library.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|