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<title>libasyncns @PACKAGE_VERSION@</title>
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<h1><a name="top">libasyncns @PACKAGE_VERSION@</a></h1>
<p><i>Copyright 2005-2008 Lennart Poettering <@PACKAGE_BUGREPORT@></i></p>
<ul class="toc">
<li><a href="#license">License</a></li>
<li><a href="#news">News</a></li>
<li><a href="#overview">Overview</a></li>
<li><a href="#status">Current Status</a></li>
<li><a href="#documentation">Documentation</a></li>
<li><a href="#requirements">Requirements</a></li>
<li><a href="#installation">Installation</a></li>
<li><a href="#acks">Acknowledgements</a></li>
<li><a href="#download">Download</a></li>
</ul>
<h2><a name="license">License</a></h2>
<p>This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 2.1 of the
License, or (at your option) any later version.</p>
<p>This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.</p>
<h2><a name="news">News</a></h2>
<div class="news-date">Tue 28 Oct
2008: </div> <p class="news-text"><a href="@PACKAGE_URL@libasyncns-0.7.tar.gz">Version
0.7</a> released; changes include: rework thread shutdown logic.</p>
<div class="news-date">Fri 24 Oct
2008: </div> <p class="news-text"><a href="@PACKAGE_URL@libasyncns-0.6.tar.gz">Version
0.6</a> released; changes include: save and restore <tt>h_errno</tt>
in addition to <tt>errno</tt>; drop usage of pthread's cancelling
since it is problematic on some platforms.</p>
<div class="news-date">Sun 17 Aug
2008: </div> <p class="news-text"><a href="@PACKAGE_URL@libasyncns-0.5.tar.gz">Version
0.5</a> released; changes include: fix getaddrinfo() serialization.</p>
<div class="news-date">Sun 27 Jul
2008: </div> <p class="news-text"><a href="@PACKAGE_URL@libasyncns-0.4.tar.gz">Version
0.4</a> released; changes include: rework error handling logic,
add <tt>asyncns_freeanswer()</tt>, a lot of fixes</p>
<div class="news-date">Wed 23 May 2007: </div> <p class="news-text"><a
href="@PACKAGE_URL@libasyncns-0.3.tar.gz">Version 0.3</a> released;
changes include: build fixes: properly detect <tt>res_query()</tt> on
Linux/AMD64, support older autoconf versions</p>
<div class="news-date">Fri 16 Feb 2007: </div> <p class="news-text"><a
href="@PACKAGE_URL@libasyncns-0.2.tar.gz">Version 0.2</a> released;
changes include: <tt>res_query()</tt> support; minor bug fixes; doc updates</p>
<div class="news-date">Sat 8 Jan 2005: </div> <p class="news-text"><a
href="@PACKAGE_URL@libasyncns-0.1.tar.gz">Version 0.1</a> released</p>
<h2><a name="overview">Overview</a></h2>
<p><tt>libasyncns</tt> is a C library for Linux/Unix for executing name
service queries asynchronously. It is an asynchronous wrapper around
<tt>getaddrinfo(3)</tt>, <tt>getnameinfo(3)</tt>, <tt>res_query(3)</tt> and
<tt>res_search(3)</tt> from <tt>libc</tt> and <tt>libresolv</tt>.</p>
<p>In contrast to GNU's asynchronous name resolving API
<tt>getaddrinfo_a()</tt>, <tt>libasyncns</tt> does not make use of
UNIX signals for reporting completion of name queries. Instead, the
API exports a standard UNIX file descriptor which may be integerated
cleanly into custom main loops.</p>
<p>In contrast to asynchronous DNS resolving libraries like <tt><a
href="http://libdenise.sourceforge.net/">libdenise</a></tt>, <tt><a
href="http://www.skarnet.org/software/skadns/">skadns</a></tt>, <tt><a
href="http://www.chiark.greenend.org.uk/~ian/adns/">adns</a></tt>,
<tt>libasyncns</tt> is just an asynchronous wrapper around the libc's
synchronous <tt>getaddrinfo()</tt> API, which has the advantage of
allowing name resolution using techniques like <a
href="http://0pointer.de/lennart/projects/nss-mdns/">Multicast
DNS</a>, LDAP or NIS using standard <tt>libc</tt> NSS (Name Service
Switch) modules. <tt>libasyncns</tt> is compatible with IPv6 if the
underlying <tt>libc</tt> is.</p>
<p><tt>libasyncns</tt> is very tiny, consisting of just one header and
one source file. It has no dependencies besides <tt>libc</tt>.</p>
<p>By default <tt>libasyncns</tt> spawns a number of worker threads
(LWPs) to process name queries. Alternatively or when POSIX Threads
are not supported, <tt>libasyncns</tt> can <tt>fork()</tt> off worker
processes instead.</p>
<h2><a name="status">Current Status</a></h2>
<p>Version @PACKAGE_VERSION@ is quite stable and feature complete.</p>
<p>Damien Thébault has written a Python module <a href="https://launchpad.net/libasyncns-python">libasyncns-python</a> that wraps the libasyncns C API.</p>
<h2><a name="documentation">Documentation</a></h2>
<p>You may browse the <a href="http://www.doxygen.org/">Doxygen</a>
generated <a
href="http://0pointer.de/lennart/projects/libasyncns/doxygen/">programing
documentation</a> the API. (Run <tt>make doxygen</tt> to generate this
documentation from the source tree)</p>
<h2><a name="requirements">Requirements</a></h2>
<p>Currently, <tt>libasyncns</tt> is tested on Linux and Solaris (<tt>sparc-sun-solaris2.8</tt>) only.</p>
<p><tt>libasyncns</tt> was developed and tested on Debian GNU/Linux
"testing" from January 2005, it should work on most other Linux
distributions (and maybe Unix versions) since it uses GNU autoconf and
GNU libtool for source code configuration and shared library
management.</p>
<p><tt>libasyncns</tt> has no dependencies besides a <tt>libc</tt> that supports <tt>getaddrinfo()</tt> and <tt>res_query()</tt>.</p>
<h2><a name="installation">Installation</a></h2>
<p>As this package is made with the GNU autotools you should run
<tt>./configure</tt> inside the distribution directory for configuring
the source tree. After that you should run <tt>make</tt> for
compilation and <tt>make install</tt> (as root) for installation of
<tt>libasyncns</tt>.</p>
<h2><a name="acks">Acknowledgements</a></h2>
<p>Sjoerd Simons for the <tt>res_query()</tt> support.</p>
<h2><a name="download">Download</a></h2>
<p>The newest release is always available from <a href="@PACKAGE_URL@">@PACKAGE_URL@</a></p>
<p>The current release is <a href="@PACKAGE_URL@libasyncns-@PACKAGE_VERSION@.tar.gz">@PACKAGE_VERSION@</a></p>
<p>Get <tt>libasyncns</tt>'s development sources from the <a href="http://git.or.cz/">GIT</a> <a href="git://git.0pointer.de/libasyncns">repository</a> (<a href="http://git.0pointer.de/?p=libasyncns.git">gitweb</a>): </p>
<pre>git clone git://git.0pointer.de/libasyncns</pre>
<p>You may find an up to date Debian package of <tt>libasyncns</tt> on the <a href="http://packages.debian.org/libasyncns0">Debian package repository</a>.</p>
<p>If you want to be notified whenever I release a new version of this software use the subscription feature of <a href="http://freshmeat.net/projects/libasyncns/">Freshmeat</a>.</p>
<hr/>
<address class="grey">Lennart Poettering <@PACKAGE_BUGREPORT@>, October 2008</address>
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