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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
    "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
<meta name="generator" content="AsciiDoc 8.6.9" />
<title>Anet</title>
<link rel="stylesheet" href="./asciidoc.css" type="text/css" />
</head>
<body class="article">
<table class="main" cellspacing="0" cellpadding="0"><tr><td class="header">
<div id="header">
<h1>Anet</h1>
</div>
</td></tr>
<tr><td class="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>Anet is a networking library for the Ada programming language.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_features">Features</h2>
<div class="sectionbody">
<div class="paragraph"><p>The Anet networking library has the following features:</p></div>
<div class="ulist"><ul>
<li>
<p>
BSD socket implementation
</p>
</li>
<li>
<p>
High abstraction level
</p>
</li>
<li>
<p>
Extendable socket type hierarchy
</p>
</li>
<li>
<p>
Socket receiver tasks (Stream and Datagram)
</p>
</li>
<li>
<p>
Ada type serialisation/deserialisation over sockets
</p>
</li>
<li>
<p>
Supported socket families
</p>
<div class="ulist"><ul>
<li>
<p>
IPv4 (AF_INET)
</p>
</li>
<li>
<p>
IPv6 (AF_INET6)
</p>
</li>
<li>
<p>
Packet (AF_PACKET)
</p>
</li>
<li>
<p>
UNIX domain (AF_UNIX)
</p>
</li>
<li>
<p>
Netlink (AF_NETLINK)
</p>
</li>
</ul></div>
</li>
<li>
<p>
Supported socket modes
</p>
<div class="ulist"><ul>
<li>
<p>
Stream (TCP)
</p>
</li>
<li>
<p>
Datagram (UDP)
</p>
</li>
<li>
<p>
RAW
</p>
</li>
</ul></div>
</li>
<li>
<p>
Support for IPv4/IPv6 multicast
</p>
</li>
<li>
<p>
UDP/IPv4 packet creation and validation
</p>
</li>
<li>
<p>
Binding to the Linux Packet Filter (LPF) system
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_download">Download</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_release_version">Release version</h3>
<div class="paragraph"><p>The current release version of Anet is available at
<a href="http://www.codelabs.ch/download/">http://www.codelabs.ch/download/</a>.</p></div>
</div>
<div class="sect2">
<h3 id="_verify_a_release">Verify a Release</h3>
<div class="paragraph"><p>To verify the integrity and authenticity of the distribution tarball, import
the key <a href="http://www.codelabs.ch/keys/0xBB793815pub.asc">http://www.codelabs.ch/keys/0xBB793815pub.asc</a> and type the following
command:</p></div>
<div class="literalblock">
<div class="content">
<pre><tt>$ gpg --verify libanet-{version}.tar.bz2.sig</tt></pre>
</div></div>
<div class="paragraph"><p>The key fingerprint of the public key (<em>0xBB793815</em>) is:</p></div>
<div class="literalblock">
<div class="content">
<pre><tt>Key fingerprint = A2FB FF56 83FB 67D8 017B  C50C F8C5 F8B5 BB79 3815</tt></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_development_version">Development version</h3>
<div class="paragraph"><p>The current development version of Anet is available through its git repository:</p></div>
<div class="literalblock">
<div class="content">
<pre><tt>$ git clone http://git.codelabs.ch/git/anet.git</tt></pre>
</div></div>
<div class="paragraph"><p>A browsable version of the repository is also available here:
<a href="http://git.codelabs.ch/?p=anet.git">http://git.codelabs.ch/?p=anet.git</a></p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_installation">Installation</h2>
<div class="sectionbody">
<div class="paragraph"><p>To compile and install Anet on your system, you need to have the following
software installed:</p></div>
<div class="ulist"><ul>
<li>
<p>
GNAT Ada compiler:
  <a href="http://www.gnu.org/software/gnat/gnat.html">http://www.gnu.org/software/gnat/gnat.html</a>
</p>
</li>
</ul></div>
<div class="paragraph"><p>If you want to run the unit tests before installation of Anet (which is
recommended) you furthermore need to have the following installed:</p></div>
<div class="ulist"><ul>
<li>
<p>
Ahven (Test-Framework):
  <a href="http://ahven.stronglytyped.org/">http://ahven.stronglytyped.org/</a>
</p>
</li>
</ul></div>
<div class="paragraph"><p>Anet supports BSD and Linux operating systems. To build for BSD, append
<tt>OS=bsd</tt> to the <tt>make</tt> commands below. The building and installation process of
Anet is straightforward. Just type in the following commands.</p></div>
<div class="literalblock">
<div class="content">
<pre><tt>$ make
$ make PREFIX=/usr/local install</tt></pre>
</div></div>
<div class="paragraph"><p>If neither <tt>PREFIX</tt> nor <tt>OS</tt> are specified, <tt>$(HOME)/libraries</tt> is used as
installation directory and the library is built for Linux.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_testing">Testing</h2>
<div class="sectionbody">
<div class="paragraph"><p>Anet contains a comprehensive unit test suite which can be run by entering the
following command:</p></div>
<div class="literalblock">
<div class="content">
<pre><tt>$ make tests</tt></pre>
</div></div>
<div class="paragraph"><p>All tests should be marked with <strong>PASS</strong> behind the test name. To run the tests
on BSD, type:</p></div>
<div class="literalblock">
<div class="content">
<pre><tt>$ make tests OS=bsd</tt></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_licence">Licence</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre><tt>Copyright (C) 2011-2013 secunet Security Networks AG
Copyright (C) 2011-2014 Reto Buerki &lt;reet@codelabs.ch&gt;
Copyright (C) 2011-2014 Adrian-Ken Rueegsegger &lt;ken@codelabs.ch&gt;

Free use of this software is granted under the terms of the GNAT Modified
General Public License (GMGPL).</tt></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">Example</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_server_unix_tcp">Server (UNIX/TCP)</h3>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.7
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Copyright (C) 2012 secunet Security Networks AG</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Copyright (C) 2012 Reto Buerki &lt;reet@codelabs.ch&gt;</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Copyright (C) 2012 Adrian-Ken Rueegsegger &lt;ken@codelabs.ch&gt;</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  This program is free software; you can redistribute it and/or modify it</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  under the terms of the GNU General Public License as published by the</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Free Software Foundation; either version 2 of the License, or (at your</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  option) any later version.  See &lt;http://www.fsf.org/copyleft/gpl.txt&gt;.</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  This program is distributed in the hope that it will be useful, but</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  for more details.</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  As a special exception, if other files instantiate generics from this</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  unit,  or  you  link  this  unit  with  other  files  to  produce  an</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  executable   this  unit  does  not  by  itself  cause  the  resulting</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  executable to  be  covered by the  GNU General  Public License.  This</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  exception does  not  however  invalidate  any  other reasons why  the</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  executable file might be covered by the GNU Public License.</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>

<span style="font-weight: bold"><span style="color: #000080">with</span></span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">;</span>

<span style="font-weight: bold"><span style="color: #000080">with</span></span> Anet<span style="color: #990000">.</span>Streams<span style="color: #990000">;</span>
<span style="font-weight: bold"><span style="color: #000080">with</span></span> Anet<span style="color: #990000">.</span>Sockets<span style="color: #990000">.</span>Unix<span style="color: #990000">;</span>
<span style="font-weight: bold"><span style="color: #000080">with</span></span> Anet<span style="color: #990000">.</span>Receivers<span style="color: #990000">.</span>Stream<span style="color: #990000">;</span>

<span style="font-weight: bold"><span style="color: #0000FF">procedure</span></span> Server <span style="font-weight: bold"><span style="color: #0000FF">is</span></span>

   <span style="font-weight: bold"><span style="color: #0000FF">package</span></span> Unix_TCP_Receiver <span style="font-weight: bold"><span style="color: #0000FF">is</span></span> <span style="font-weight: bold"><span style="color: #0000FF">new</span></span> Anet<span style="color: #990000">.</span>Receivers<span style="color: #990000">.</span>Stream
     <span style="color: #990000">(</span>Socket_Type <span style="color: #990000">=&gt;</span> Anet<span style="color: #990000">.</span>Sockets<span style="color: #990000">.</span>Unix<span style="color: #990000">.</span>TCP_Socket_Type<span style="color: #990000">);</span>

   <span style="font-weight: bold"><span style="color: #0000FF">procedure</span></span> Handle_Request
     <span style="color: #990000">(</span>Recv_Data <span style="color: #990000">:</span>     Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span>Stream_Element_Array<span style="color: #990000">;</span>
      Send_Data <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">out</span></span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span>Stream_Element_Array<span style="color: #990000">;</span>
      Send_Last <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">out</span></span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span>Stream_Element_Offset<span style="color: #990000">);</span>
   <span style="font-style: italic"><span style="color: #9A1900">--  Handle requests from clients.</span></span>

   <span style="font-weight: bold"><span style="color: #0000FF">procedure</span></span> Handle_Request
     <span style="color: #990000">(</span>Recv_Data <span style="color: #990000">:</span>     Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span>Stream_Element_Array<span style="color: #990000">;</span>
      Send_Data <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">out</span></span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span>Stream_Element_Array<span style="color: #990000">;</span>
      Send_Last <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">out</span></span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span>Stream_Element_Offset<span style="color: #990000">)</span>
   <span style="font-weight: bold"><span style="color: #0000FF">is</span></span>
      Stream <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">aliased</span></span> Anet<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Memory_Stream_Type</span></span> <span style="color: #990000">(</span>Max_Elements <span style="color: #990000">=&gt;</span> <span style="color: #993399">4</span><span style="color: #990000">);</span>
      Number <span style="color: #990000">:</span> <span style="color: #009900">Integer</span><span style="color: #990000">;</span>
   <span style="font-weight: bold"><span style="color: #0000FF">begin</span></span>
      Stream<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Set_Buffer</span></span> <span style="color: #990000">(</span>Buffer <span style="color: #990000">=&gt;</span> Recv_Data<span style="color: #990000">);</span>
      <span style="color: #009900">Integer</span><span style="color: #FF0000">'Read (Stream'</span><span style="font-weight: bold"><span style="color: #0000FF">Access</span></span><span style="color: #990000">,</span> Number<span style="color: #990000">);</span>

      Number <span style="color: #990000">:=</span> Number <span style="color: #990000">+</span> <span style="color: #993399">1</span><span style="color: #990000">;</span>

      <span style="color: #009900">Integer</span><span style="color: #FF0000">'Write (Stream'</span><span style="font-weight: bold"><span style="color: #0000FF">Access</span></span><span style="color: #990000">,</span> Number<span style="color: #990000">);</span>
      Send_Last <span style="color: #990000">:=</span> Stream<span style="color: #990000">.</span>Get_Buffer'Length<span style="color: #990000">;</span>
      <span style="font-weight: bold"><span style="color: #000000">Send_Data</span></span> <span style="color: #990000">(</span>Send_Data'First <span style="color: #990000">..</span> Send_Last<span style="color: #990000">)</span> <span style="color: #990000">:=</span> Stream<span style="color: #990000">.</span>Get_Buffer<span style="color: #990000">;</span>
   <span style="font-weight: bold"><span style="color: #0000FF">end</span></span> Handle_Request<span style="color: #990000">;</span>

   Socket   <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">aliased</span></span> Anet<span style="color: #990000">.</span>Sockets<span style="color: #990000">.</span>Unix<span style="color: #990000">.</span>TCP_Socket_Type<span style="color: #990000">;</span>
   Receiver <span style="color: #990000">:</span> Unix_TCP_Receiver<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Receiver_Type</span></span> <span style="color: #990000">(</span>S <span style="color: #990000">=&gt;</span> Socket'<span style="font-weight: bold"><span style="color: #0000FF">Access</span></span><span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">begin</span></span>
   Socket<span style="color: #990000">.</span>Init<span style="color: #990000">;</span>
   Socket<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Bind</span></span> <span style="color: #990000">(</span>Path <span style="color: #990000">=&gt;</span> <span style="color: #FF0000">"/tmp/anet.example"</span><span style="color: #990000">);</span>
   Receiver<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Listen</span></span> <span style="color: #990000">(</span>Callback <span style="color: #990000">=&gt;</span> Handle_Request'<span style="font-weight: bold"><span style="color: #0000FF">Access</span></span><span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span> Server<span style="color: #990000">;</span></tt></pre></div></div>
</div>
<div class="sect2">
<h3 id="_client_unix_tcp">Client (UNIX/TCP)</h3>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.7
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Copyright (C) 2012 secunet Security Networks AG</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Copyright (C) 2012 Reto Buerki &lt;reet@codelabs.ch&gt;</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Copyright (C) 2012 Adrian-Ken Rueegsegger &lt;ken@codelabs.ch&gt;</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  This program is free software; you can redistribute it and/or modify it</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  under the terms of the GNU General Public License as published by the</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  Free Software Foundation; either version 2 of the License, or (at your</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  option) any later version.  See &lt;http://www.fsf.org/copyleft/gpl.txt&gt;.</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  This program is distributed in the hope that it will be useful, but</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  for more details.</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  As a special exception, if other files instantiate generics from this</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  unit,  or  you  link  this  unit  with  other  files  to  produce  an</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  executable   this  unit  does  not  by  itself  cause  the  resulting</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  executable to  be  covered by the  GNU General  Public License.  This</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  exception does  not  however  invalidate  any  other reasons why  the</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--  executable file might be covered by the GNU Public License.</span></span>
<span style="font-style: italic"><span style="color: #9A1900">--</span></span>

<span style="font-weight: bold"><span style="color: #000080">with</span></span> Ada<span style="color: #990000">.</span>Text_IO<span style="color: #990000">;</span>
<span style="font-weight: bold"><span style="color: #000080">with</span></span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">;</span>

<span style="font-weight: bold"><span style="color: #000080">with</span></span> Anet<span style="color: #990000">.</span>Streams<span style="color: #990000">;</span>
<span style="font-weight: bold"><span style="color: #000080">with</span></span> Anet<span style="color: #990000">.</span>Sockets<span style="color: #990000">.</span>Unix<span style="color: #990000">;</span>

<span style="font-weight: bold"><span style="color: #0000FF">procedure</span></span> Client <span style="font-weight: bold"><span style="color: #0000FF">is</span></span>
   Number <span style="color: #990000">:</span> <span style="color: #009900">Integer</span> <span style="color: #990000">:=</span> <span style="color: #993399">0</span><span style="color: #990000">;</span>
   Socket <span style="color: #990000">:</span> Anet<span style="color: #990000">.</span>Sockets<span style="color: #990000">.</span>Unix<span style="color: #990000">.</span>TCP_Socket_Type<span style="color: #990000">;</span>
   Stream <span style="color: #990000">:</span> <span style="font-weight: bold"><span style="color: #0000FF">aliased</span></span> Anet<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Memory_Stream_Type</span></span> <span style="color: #990000">(</span>Max_Elements <span style="color: #990000">=&gt;</span> <span style="color: #993399">4</span><span style="color: #990000">);</span>
<span style="font-weight: bold"><span style="color: #0000FF">begin</span></span>
   Socket<span style="color: #990000">.</span>Init<span style="color: #990000">;</span>
   Socket<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Connect</span></span> <span style="color: #990000">(</span>Path <span style="color: #990000">=&gt;</span> <span style="color: #FF0000">"/tmp/anet.example"</span><span style="color: #990000">);</span>

   <span style="font-weight: bold"><span style="color: #0000FF">loop</span></span>
      Ada<span style="color: #990000">.</span>Text_IO<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Put_Line</span></span> <span style="color: #990000">(</span><span style="color: #FF0000">"PING"</span> <span style="color: #990000">&amp;</span> Number'Img<span style="color: #990000">);</span>
      <span style="color: #009900">Integer</span><span style="color: #FF0000">'Write (Stream'</span><span style="font-weight: bold"><span style="color: #0000FF">Access</span></span><span style="color: #990000">,</span> Number<span style="color: #990000">);</span>
      Socket<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Send</span></span> <span style="color: #990000">(</span>Item <span style="color: #990000">=&gt;</span> Stream<span style="color: #990000">.</span>Get_Buffer<span style="color: #990000">);</span>

      <span style="font-weight: bold"><span style="color: #0000FF">declare</span></span>
         Buffer <span style="color: #990000">:</span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Stream_Element_Array</span></span> <span style="color: #990000">(</span><span style="color: #993399">1</span> <span style="color: #990000">..</span> <span style="color: #993399">4</span><span style="color: #990000">);</span>
         Last   <span style="color: #990000">:</span> Ada<span style="color: #990000">.</span>Streams<span style="color: #990000">.</span>Stream_Element_Offset<span style="color: #990000">;</span>
      <span style="font-weight: bold"><span style="color: #0000FF">begin</span></span>
         Socket<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Receive</span></span> <span style="color: #990000">(</span>Item <span style="color: #990000">=&gt;</span> Buffer<span style="color: #990000">,</span>
                         Last <span style="color: #990000">=&gt;</span> Last<span style="color: #990000">);</span>
         Stream<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Set_Buffer</span></span> <span style="color: #990000">(</span>Buffer <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">Buffer</span></span> <span style="color: #990000">(</span>Buffer'First <span style="color: #990000">..</span> Last<span style="color: #990000">));</span>
         <span style="color: #009900">Integer</span><span style="color: #FF0000">'Read (Stream'</span><span style="font-weight: bold"><span style="color: #0000FF">Access</span></span><span style="color: #990000">,</span> Number<span style="color: #990000">);</span>
         Ada<span style="color: #990000">.</span>Text_IO<span style="color: #990000">.</span><span style="font-weight: bold"><span style="color: #000000">Put_Line</span></span> <span style="color: #990000">(</span><span style="color: #FF0000">"PONG"</span> <span style="color: #990000">&amp;</span> Number'Img<span style="color: #990000">);</span>
      <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">;</span>

      <span style="font-weight: bold"><span style="color: #0000FF">delay</span></span> <span style="color: #993399">1.0</span><span style="color: #990000">;</span>
   <span style="font-weight: bold"><span style="color: #0000FF">end</span></span> <span style="font-weight: bold"><span style="color: #0000FF">loop</span></span><span style="color: #990000">;</span>
<span style="font-weight: bold"><span style="color: #0000FF">end</span></span> Client<span style="color: #990000">;</span></tt></pre></div></div>
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