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    <div class="header">
      <h1>USOCKET - Universal socket library for Common Lisp<br>
      </h1>
    </div>
    <ul>
      <li><a href="#goal">Goal</a></li>
      <li><a href="#documentation">Documentation</a></li>
      <li><a href="api-docs.shtml#faqs"><i>FAQ</i></a></li>
      <li><a href="#implementations">Supported implementations</a></li>
      <li><a href="#community">Community</a></li>
      <li><a href="#development">Development</a></li>
      <li><a href="#guarantees">Interface guarantees</a></li>
      <li><a href="#releases">Releases</a></li>
      <li><a href="#history">Project history</a></li>
    </ul>
    <h2><a name="goal">Goal</a></h2>
    <p>The project wants to provide a portable TCP/IP and UDP/IP socket
      interface for as many Common Lisp implementations as possible,
      while keeping the abstraction and portability layer as thin as
      possible. <i>IPv6 support is partially available for LispWorks,
        SBCL and CCL, etc.</i><br>
    </p>
    <p>Because <a href="http://cliki.net/trivial-sockets">trivial-sockets</a>
      has been declared dead and its author has said he will declare
      usocket its successor if there is a zero effort path of migration,
      I'm <b>also working on <em>trivial-usocket</em></b> which is
      supposed to be a sub-optimal, but zero effort migration from
      trivial-sockets.</p>
    <p>If your lisp isn't mentioned in the list below, please feel free
      to submit a request for it at the mailing list mentioned below.</p>
    <h3>Comparison to other socket libraries</h3>
    <p>Since usocket is effectively the successor to trivial-sockets,
      see the <a href="feature-comparison.shtml">feature comparison</a>
      with trivial-sockets in order to find out which one you should
      use.</p>
    <p>After starting the project, many others turned out to have worked
      on something alike, many times as part of a broader project or
      library. Some of them were known at the start of this project,
      others have been conceived after the usocket project already
      started. Not all of them have exactly the same portability goal.</p>
    <p>See the <a href="implementation-comparison.shtml">Implementation
        comparison</a> page for a comparison of the portability of other
      libraries and how that relates to usocket.</p>
    <h2><a name="documentation">Documentation</a></h2>
    <p>See the documentation page for the <a href="./api-docs.shtml">API


        description</a>.</p>
    <h2><a name="implementations">Supported implementations</a></h2>
    <p>Currently these implementations are supported:</p>
    <ul>
    </ul>
    <ol>
      <li><a href="http://www.franz.com/products/allegro-common-lisp/">Allegro


          CL</a></li>
      <li><a href="http://common-lisp.net/project/armedbear/">ABCL </a>(ArmedBear)</li>
      <li><a href="https://github.com/clasp-developers/clasp">Clasp</a></li>
      <li><a href="http://ccl.clozure.com">Clozure CL</a> (aka OpenMCL)</li>
      <li><a href="https://github.com/sharplispers/cormanlisp">Corman
          Lisp</a> (based on :acl-socket module) </li>
      <li>GNU <a href="http://www.clisp.org">CLISP</a></li>
      <li><a href="http://www.cons.org/cmucl">CMUCL</a></li>
      <li><a href="https://common-lisp.net/project/ecl/">ECL</a></li>
      <li><a href="http://www.lispworks.com/products/lispworks.html">LispWorks</a>
        (4.3 and up)</li>
      <li>Digitool <a href="http://code.google.com/p/mcl/">MCL</a> and
        RMCL (5.0 and up)</li>
      <li><a href="https://github.com/froggey/Mezzano">Mezzano</a></li>
      <li><a moz-do-not-send="true" href="https://mkcl.common-lisp.dev">MKCL</a><br>
      </li>
      <li><a href="http://wukix.com/mocl">MOCL</a></li>
      <li><a href="http://www.sbcl.org">SBCL</a></li>
      <li><a href="http://www.scieneer.com/scl/">Scieneer CL</a> (dead)</li>
      <li><a href="http://www.symbolics-dks.com">Symbolics</a> Lisp
        Machine (<a
          href="http://www.bitsavers.org/pdf/symbolics/software/genera_8/">Genera</a>)<br>
      </li>
    </ol>
    <ul>
    </ul>
    <h2><a name="community">Community</a></h2>
    <p>This project has started January 2006. There isn't much of a
      community yet, though I'd like there to be one. So, you're invited
      to join the mailing list, announce yourself and even join the
      effort! </p>
    <p>Development discussion takes place on <a
        href="http://common-lisp.net/cgi-bin/mailman/listinfo/usocket-devel">usocket-devel@common-lisp.net</a>.
    </p>
    <p>Project tracking happens on <a
        href="https://github.com/usocket/usocket">GitHub</a>. Please
      take note of the guidelines before entering a bug or enhancement
      request into the database.</p>
    <div class="roadmap">
      <h2><a name="development">Development</a></h2>
      <p>Development will at least follow the steps outlined below. Yet
        to be determined is whether the currently mentioned steps will
        be enough to release version 1.0. Possibly, UDP sockets remain
        to be addressed before doing 1.0; that will depend on your
        reactions :-) </p>
      <p>The targeted implementations listed in the status table below
        are not a final list: others can be added if/when the need or
        interest arises. </p>
      <p><a href="https://github.com/usocket/usocket">Active development</a>
        is taking place on GitHub. To be kept up to date, please <a
          href="http://common-lisp.net/cgi-bin/mailman/listinfo/usocket-devel">subscribe


          to the development mailing list</a>. To use the latest
        development version, make sure you have <a
          href="http://git-scm.com/">git</a> installed and execute this
        command: </p>
      <pre> $ git clone https://github.com/usocket/usocket.git<br>  </pre>
      <p>Please send patches, bug reports and suggestions to the
        development mailing list address given above. The table below
        indicates the current state of development. </p>
      <table style="font-size: small;" rules="all" cellpadding="3"
        border="1">
        <caption style="font-weight: bold; font-size: large;">Status for
          the currently targeted backends</caption> <thead
          class="roadmap-head"> <tr>
            <th colspan="2">Major steps</th>
            <th colspan="10">Socket implementations</th>
          </tr>
          <tr>
            <th><br>
            </th>
            <th>Minor steps</th>
            <th><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Fsb-bsd-sockets.txt&amp;rev=0&amp;sc=0">SBCL</a></th>
            <th><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Fcmucl-sockets.txt&amp;rev=0&amp;sc=0">CMUCL</a></th>
            <th><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Fabcl-socket.txt&amp;rev=0&amp;sc=0">ABCL</a></th>
            <th><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Fclisp-sockets.txt&amp;rev=0&amp;sc=0">CLISP</a></th>
            <th><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Fallegro-socket.txt&amp;rev=0&amp;sc=0">Allegro


                <br>
              </a></th>
            <th><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Flw-sockets.txt&amp;rev=0&amp;sc=0">LispWorks</a></th>
            <th><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Fopenmcl-sockets.txt&amp;rev=0&amp;sc=0">CCL</a></th>
            <th>ECL</th>
            <th>Scieneer</th>
            <th>MCL </th>
          </tr>
        </thead> <tbody>
          <tr style="border-color: rgb(0, 0, 0); border-width: 2px;">
            <td rowspan="5">Minimal active sockets support at the same
              level as provided by <a
                href="http://cliki.net/trivial-sockets">trivial-sockets</a>.<br>
              (Meaning streamed tcp traffic on connected sockets.)</td>
            <td><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Factive-sockets-apis.txt&amp;rev=0&amp;sc=0">Investigate


                interfaces provided.</a></td>
            <td class="DONE">DONE</td>
            <!-- SBCL --> <td class="DONE">DONE</td>
            <!-- CMUCL --> <td class="DONE">DONE</td>
            <!-- ABCL --> <td class="DONE">DONE</td>
            <!-- clisp --> <td class="DONE">DONE</td>
            <!-- Allegro --> <td class="DONE">DONE</td>
            <!-- LispWorks --> <td class="DONE">DONE</td>
            <!-- OpenMCL --> <td class="DONE">DONE</td>
            <!-- ECL --> <td class="DONE">DONE</td>
            <td style="vertical-align: top; background-color: rgb(0,
              153, 0);">DONE<br>
            </td>
            <!-- Scieneer --> </tr>
          <tr>
            <td>Identify socket errors generated.</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE" title="No specific errors available">DONE</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE" title="Implemented">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Implement active socket support.</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Implement remapping of implementation defined errors.</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Implementation test-suite status</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="DONE">PASS</td>
          </tr>
          <tr>
            <td rowspan="3">Add functions to retrieve socket properties:<br>
              Local and remote IP address and port.</td>
            <td><a
href="http://common-lisp.net/websvn/filedetails.php?repname=usocket&amp;path=%2Fusocket%2Ftrunk%2Fnotes%2Faddress-apis.txt&amp;rev=0&amp;sc=0">Investigate


                interfaces provided</a></td>
            <td class="DONE">DONE</td>
            <!-- SBCL --> <td class="DONE">DONE</td>
            <!-- CMUCL --> <td class="DONE">DONE</td>
            <!-- ABCL --> <td class="DONE">DONE</td>
            <!-- clisp --> <td class="DONE">DONE</td>
            <!-- Allegro --> <td class="DONE">DONE</td>
            <!-- LispWorks --> <td class="DONE">DONE</td>
            <!-- OpenMCL --> <td class="DONE">DONE</td>
            <!-- ECL --> <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <!-- Scieneer --> </tr>
          <tr>
            <td>Implement it.</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Implementation test-suite status</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="PASS">PASS</td>
            <td class="DONE">PASS</td>
          </tr>
          <tr>
            <td rowspan="3">Add support for passive
              (connection-accepting/server) sockets.</td>
            <td>Investigate interfaces provided</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Implement api calls listen and accept</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Implement api calls get- and setsockopt (or equivalent).</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td rowspan="2">Implement efficient waiting for multiple
              sockets in one function call (select() like behavior).</td>
            <td><a
                href="http://trac.common-lisp.net/usocket/wiki/SocketSelect">Investigate


                interfaces provided</a></td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Implement wait-for-input api.</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td rowspan="2">Implement more uncommon API calls for TCP
              streams.</td>
            <td>send, recv</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
            <td class="TODO">TODO</td>
          </tr>
          <tr>
            <td>shutdown</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
            <td class="WIP">WIP</td>
          </tr>
          <tr>
            <td rowspan="2">Implement UDP socket support.</td>
            <td><a
                href="http://trac.common-lisp.net/usocket/wiki/DatagramSockets">Investigate


                API's provided</a></td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td>Build on top of that (or custom ffi).</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
            <td class="DONE">DONE</td>
          </tr>
          <tr>
            <td valign="top">Implement IPv6 support<br>
            </td>
            <td valign="top">Implementation on platforms other than
              SBCL/CCL; API polish<br>
            </td>
            <td valign="top" bgcolor="#009900">DONE<br>
            </td>
            <td valign="top" bgcolor="#ff6600">WIP<br>
            </td>
            <td valign="top" bgcolor="#ff6600">WIP<br>
            </td>
            <td valign="top" bgcolor="#ff6600">WIP<br>
            </td>
            <td valign="top" bgcolor="#ff6600">WIP 2<br>
            </td>
            <td valign="top" bgcolor="#009900" align="center">DONE</td>
            <td valign="top" bgcolor="#009900">DONE<br>
            </td>
            <td valign="top" bgcolor="#ff6600">WIP<br>
            </td>
            <td valign="top" bgcolor="#ff6600">WIP<br>
            </td>
            <td valign="top" bgcolor="#ff0000">N/A<br>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    <h2><a name="guarantees">Interface guarantees</a></h2>
    <p>The interfaces currently published in the :export part of the
      package definition are guaranteed to stay compatible for the
      entire 0.x lifecycle. Extention in a backward compatible way is of
      course valid, as is the addition of new interface functions.</p>
    <h2><a name="releases">Releases</a></h2>
    <h3>Current release</h3>
    <p>Releases are uploaded to the <a href="releases/">releases/</a>
      directory. You can find short descriptions in the table below:</p>
    <table>
      <caption><b>USOCKET Release History</b></caption> <tbody>
        <tr>
          <th>Date</th>
          <th>Release</th>
          <th>Summary</th>
        </tr>
        <tr>
          <td valign="top">Jul 23, 2024<br>
          </td>
          <td valign="top">0.8.8<br>
          </td>
          <td valign="top">Cumulative bugfixes for SBCL and Clozure CL,
            etc.; Exported <b>get-host-name</b><br>
          </td>
        </tr>
        <tr>
          <td valign="top">Mar 20, 2024<br>
          </td>
          <td valign="top">0.8.7<br>
          </td>
          <td valign="top">Cumulative bugfixes<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Mar 1, 2023<br>
          </td>
          <td valign="top">0.8.6<br>
          </td>
          <td valign="top">Cumulative bugfixes for SBCL, LispWorks,
            Clozure CL, etc.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Sep 14, 2022<br>
          </td>
          <td valign="top">0.8.5<br>
          </td>
          <td valign="top">Cumulative bugfixes for latest versions of
            SBCL, CCL, ABCL, etc.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Mar 13, 2022<br>
          </td>
          <td valign="top">0.8.4<br>
          </td>
          <td valign="top">New backend: <b>MKCL</b>; Lots of
            accumulated bugfix (more than two years) for LispWorks,
            SBCL, CCL, etc.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Dec 23, 2019<br>
          </td>
          <td valign="top">0.8.3<br>
          </td>
          <td valign="top">New backend: <b>Mezzano</b>; Fixes of
            WAIT-FOR-INPUT for ECL and the single-socket optimization.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Jun 11, 2019<br>
          </td>
          <td valign="top">0.8.2<br>
          </td>
          <td valign="top">Fixed WAIT-FOR-INPUT for single-socket case
            in SBCL &amp; LW (on Windows); Exported <b>host-or-ip</b>
            slot of NS-CONDITION.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Feb 27, 2019<br>
          </td>
          <td valign="top">0.8.1<br>
          </td>
          <td valign="top">New backend: clasp; Fixed loading usocket.asd
            in SBCL 1.5.0<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Feb 5, 2019<br>
          </td>
          <td valign="top"><b>0.8</b><br>
          </td>
          <td valign="top">New backend (experimental): <b>IOlib</b>;
            Enhanced WAIT-FOR-INPUT on single socket.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Aug 31, 2018<br>
          </td>
          <td valign="top">0.7.1<br>
          </td>
          <td valign="top">New backend: <b>Symbolics Lisp Machine</b>;
            Host resolving APIs prefer IPv4 in mixed environment; Fixed
            <b>wait-for-input on Windows</b> for SBCL/ECL<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Oct 25, 2016<br>
          </td>
          <td valign="top"><b>0.7.0</b><br>
          </td>
          <td valign="top">Separated client and server packages.
            Enhanced supports on all LispWorks versions; bugfixes on
            CLISP, CCL and ECL.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Oct 19, 2016<br>
          </td>
          <td valign="top">0.6.5<br>
          </td>
          <td valign="top">Added support for (SOCKET-OPTION
            :READ-TIMEOUT); fixed SOCKET_SHUTDOWN in LispWorks; fixed
            loading in LispWorks old versions (5.x, 6.x)<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Mar 17, 2016<br>
          </td>
          <td valign="top">0.6.4<br>
          </td>
          <td valign="top">New API: <b>SOCKET-SHUTDOWN</b>; added <b>IPv6</b>
            support for SBCL (and Clozure CL); minimal support for <b>Corman


              Lisp</b>; minor fixes for LW, SBCL, ECL.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">May 23, 2015<br>
          </td>
          <td valign="top">0.6.3<br>
          </td>
          <td valign="top">Further CCL 1.11 compatibility; minor fixes
            for ECL; improved SOCKET-SEND and SOCKET-RECEIVE on
            LispWorks<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Apr 20, 2015<br>
          </td>
          <td valign="top">0.6.2<br>
          </td>
          <td valign="top">CCL 1.11 compatibility; minor fixes for ECL
            and LispWorks.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Jun 21, 2013<br>
          </td>
          <td valign="top">0.6.1<br>
          </td>
          <td valign="top">Initial <b>MOCL</b> support; initial MCL UDP
            support; improved SOCKET-OPTION; bugfix for CCL backend.<br>
          </td>
        </tr>
        <tr>
          <td valign="top">Dec 26, 2012<br>
          </td>
          <td valign="top"><b>0.6.0</b><br>
          </td>
          <td valign="top"><b>New API: SOCKET-OPTION</b>; Add support
            for ECL DFFI mode; bugfix for LispWorks, CLISP, ABCL, ECL.<br>
          </td>
        </tr>
        <tr>
          <td style="vertical-align: top;">Feb 27, 2012<br>
          </td>
          <td style="vertical-align: top;">0.5.5<br>
          </td>
          <td style="vertical-align: top;">LispWorks 6.1 compatibility;
            SOCKET-CONNECT argument :nodelay can now set to
            :if-supported<br>
          </td>
        </tr>
        <tr>
          <td style="vertical-align: top;">Oct 1, 2011<br>
          </td>
          <td style="vertical-align: top;">0.5.4<br>
          </td>
          <td style="vertical-align: top;">Minor fixes for ECL, Allegro
            CL modern mode, and SBCL.<br>
          </td>
        </tr>
        <tr>
          <td style="vertical-align: top;">Aug 13, 2011<br>
          </td>
          <td style="vertical-align: top;">0.5.3<br>
          </td>
          <td style="vertical-align: top;">Fixed "SBCL data flush
            problem"; Important fixes for MCL and LispWorks (delivery
            mode).<br>
          </td>
        </tr>
        <tr>
          <td style="vertical-align: top;">May 11, 2011<br>
          </td>
          <td style="vertical-align: top;">0.5.2<br>
          </td>
          <td style="vertical-align: top;">Fixed WAIT-FOR-INPUT for
            CLISP which made Hunchentoot working; Lots of bugfix for
            SBCL, ECL, ABCL and LispWorks.<br>
          </td>
        </tr>
        <tr>
          <td style="vertical-align: top;">Apr 2, 2011<br>
          </td>
          <td style="vertical-align: top;">0.5.1<br>
          </td>
          <td style="vertical-align: top;"><span style="font-weight:
              bold;">Improved CLISP support using FFI;</span> Lots of
            bugfix for CMUCL, SBCL, LispWorks, etc.<br>
          </td>
        </tr>
        <tr>
          <td>Mar&nbsp;12,&nbsp;2011</td>
          <td style="font-weight: bold;">0.5.0</td>
          <td><b>UDP support;</b> Lots of bugfixes since 0.4.1; support
            for WAIT-FOR-INPUT for SBCL and ECL on Win32; new platform
            added: Macintosh Common Lisp (5.0 and up)</td>
        </tr>
        <tr>
          <td>Dec&nbsp;27,&nbsp;2008</td>
          <td>0.4.1</td>
          <td>fixes for ECL, LispWorks, SBCL, SCL</td>
        </tr>
        <tr>
          <td>Oct&nbsp;28,&nbsp;2008</td>
          <td><b>0.4.0</b></td>
          <td><b>select()-like api</b>: make a single thread wait for
            multiple sockets.<br>
            <b>various socket options</b> for socket-creation with
            SOCKET-CONNECT. </td>
        </tr>
        <tr>
          <td>Jun&nbsp;21,&nbsp;2008</td>
          <td>0.3.6</td>
          <td>Code fixups based on advice from the ECL and OpenMCL
            maintainers. New exported symbols: WITH-MAPPED-CONDITIONS,
            NS-CONDITION, NS-ERROR, NS-UNKNOWN-ERROR and
            NS-UNKNOWN-CONDITION.</td>
        </tr>
        <tr>
          <td>Jul&nbsp;25,&nbsp;2007</td>
          <td>0.3.4</td>
          <td>Fix clisp get-host-name, multiple ECL fixes.</td>
        </tr>
        <tr>
          <td>Jun&nbsp;05,&nbsp;2007</td>
          <td>0.3.3</td>
          <td>Fix where host resolution routine was unable to resolve
            would return NIL instead of erroring.</td>
        </tr>
        <tr>
          <td>Mar&nbsp;04,&nbsp;2007</td>
          <td>0.3.2</td>
          <td>Fixes for many backends related to closing sockets.
            LispWorks fix for broken server sockets. API guarantee
            adjustments in preparation of porting Drakma.</td>
        </tr>
        <tr>
          <td>Feb&nbsp;28,&nbsp;2007</td>
          <td>0.3.1</td>
          <td>fixed with-server-socket; prevent creation of invalid
            sockets; 2 more convenience macros.</td>
        </tr>
        <tr>
          <td>Feb&nbsp;26,&nbsp;2007</td>
          <td>re-release</td>
          <td>Re-release of 0.2.3, 0.2.4, 0.2.5 and 0.3.0 tarballs
            because the originals included Subversion administration
            areas.</td>
        </tr>
        <tr>
          <td>Jan&nbsp;21,&nbsp;2007</td>
          <td><b>0.3.0</b></td>
          <td><b>Server sockets</b></td>
        </tr>
        <tr>
          <td>Jan&nbsp;19,&nbsp;2007</td>
          <td>0.2.5</td>
          <td>Allegro compilation fix.</td>
        </tr>
        <tr>
          <td>Jan&nbsp;17,&nbsp;2007</td>
          <td>0.2.4</td>
          <td>Various fixes for CMUCL, OpenMCL, Allegro and LispWorks. </td>
        </tr>
        <tr>
          <td>Jan&nbsp;04,&nbsp;2007</td>
          <td>0.2.3</td>
          <td>Add :element-type support to support stacking
            flexi-streams on socket streams for portable
            :external-format support.</td>
        </tr>
        <tr>
          <td>Jan&nbsp;03,&nbsp;2007</td>
          <td>0.2.2</td>
          <td>Add ECL support and a small SBCL bugfix.</td>
        </tr>
        <tr>
          <td>Dec&nbsp;21,&nbsp;2006</td>
          <td>0.2.1</td>
          <td>Remove 'open-stream' interface which is supposed to be
            provided by the 'trivial-usocket' package.</td>
        </tr>
        <tr>
          <td>Dec&nbsp;18,&nbsp;2006</td>
          <td><b>0.2.0</b></td>
          <td>Add support for <a
              href="http://www.scieneer.com/scl/index.html">Scieneer
              Common Lisp</a>, fix <a
              href="http://trac.common-lisp.net/usocket/ticket/6">issue
              #6</a> and API preparation for server side sockets (not in
            this release)</td>
        </tr>
        <tr>
          <td>Feb&nbsp;13,&nbsp;2006</td>
          <td>0.1.0</td>
          <td>Initial release</td>
        </tr>
      </tbody>
    </table>
    <h2><a name="history">Project History</a></h2>
    <p>Long ago the project was conceived and started by Erik Enge in an
      attempt to factor out all implementation specific sockets code
      from <a href="/project/cl-irc">cl-irc</a>. This 'long ago' must
      have been way before 2003 when I entered the cl-irc project.</p>
    <p>In January 2006, Erik Huelsmann found Erik Enge willing to donate
      the code he had still laying around to restart the project. The
      restart took place at the 27th of January when the old code was
      imported into the public repository.<br>
    </p>
    <p>Starting from 2008, Chun Tian (binghe) joined into usocket
      development team with his UDP/IP code base.<br>
    </p>
    <p>With 0.6.0 release, this project, "where it started as an
      intersection of the functionality available on different
      platforms, now slowly moving to the union of all functionality
      available on all different implementations" (Erik Huelsmann). </p>
    <p>With 0.6.2 release, Hans Huebner added basic IPv6 support for
      SBCL and Clozure CL, based on the IPv6 feature provided in new
      versions of SBCL/CCL and LispWorks.<br>
    </p>
    <hr>
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