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<h1>apps/hello-world/hello-world.c</h1><a href="a00100.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**</span>
<a name="l00002"></a>00002 <span class="comment"> * \addtogroup helloworld</span>
<a name="l00003"></a>00003 <span class="comment"> * @{</span>
<a name="l00004"></a>00004 <span class="comment"> */</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment">/**</span>
<a name="l00007"></a>00007 <span class="comment"> * \file</span>
<a name="l00008"></a>00008 <span class="comment"> *         An example of how to write uIP applications</span>
<a name="l00009"></a>00009 <span class="comment"> *         with protosockets.</span>
<a name="l00010"></a>00010 <span class="comment"> * \author</span>
<a name="l00011"></a>00011 <span class="comment"> *         Adam Dunkels &lt;adam@sics.se&gt;</span>
<a name="l00012"></a>00012 <span class="comment"> */</span>
<a name="l00013"></a>00013 
<a name="l00014"></a>00014 <span class="comment">/*</span>
<a name="l00015"></a>00015 <span class="comment"> * This is a short example of how to write uIP applications using</span>
<a name="l00016"></a>00016 <span class="comment"> * protosockets.</span>
<a name="l00017"></a>00017 <span class="comment"> */</span>
<a name="l00018"></a>00018 
<a name="l00019"></a>00019 <span class="comment">/*</span>
<a name="l00020"></a>00020 <span class="comment"> * We define the application state (struct hello_world_state) in the</span>
<a name="l00021"></a>00021 <span class="comment"> * hello-world.h file, so we need to include it here. We also include</span>
<a name="l00022"></a>00022 <span class="comment"> * uip.h (since this cannot be included in hello-world.h) and</span>
<a name="l00023"></a>00023 <span class="comment"> * &lt;string.h&gt;, since we use the memcpy() function in the code.</span>
<a name="l00024"></a>00024 <span class="comment"> */</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="a00101.html">hello-world.h</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="a00136.html">uip.h</a>"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00028"></a>00028 
<a name="l00029"></a>00029 <span class="comment">/*</span>
<a name="l00030"></a>00030 <span class="comment"> * Declaration of the protosocket function that handles the connection</span>
<a name="l00031"></a>00031 <span class="comment"> * (defined at the end of the code).</span>
<a name="l00032"></a>00032 <span class="comment"> */</span>
<a name="l00033"></a>00033 <span class="keyword">static</span> <span class="keywordtype">int</span> handle_connection(<span class="keyword">struct</span> <a class="code" href="a00078.html">hello_world_state</a> *s);
<a name="l00034"></a>00034 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00035"></a>00035 <span class="comment">/*</span>
<a name="l00036"></a>00036 <span class="comment"> * The initialization function. We must explicitly call this function</span>
<a name="l00037"></a>00037 <span class="comment"> * from the system initialization code, some time after uip_init() is</span>
<a name="l00038"></a>00038 <span class="comment"> * called.</span>
<a name="l00039"></a>00039 <span class="comment"> */</span>
<a name="l00040"></a>00040 <span class="keywordtype">void</span>
<a name="l00041"></a><a class="code" href="a00162.html#gb97849f0d3ea858eee790b69591e6427">00041</a> <a class="code" href="a00162.html#gb97849f0d3ea858eee790b69591e6427">hello_world_init</a>(<span class="keywordtype">void</span>)
<a name="l00042"></a>00042 {
<a name="l00043"></a>00043   <span class="comment">/* We start to listen for connections on TCP port 1000. */</span>
<a name="l00044"></a>00044   <a class="code" href="a00147.html#gdd1ab3704ecd4900eec61a6897d32dc8">uip_listen</a>(<a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(1000));
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00047"></a>00047 <span class="comment">/*</span>
<a name="l00048"></a>00048 <span class="comment"> * In hello-world.h we have defined the UIP_APPCALL macro to</span>
<a name="l00049"></a>00049 <span class="comment"> * hello_world_appcall so that this funcion is uIP's application</span>
<a name="l00050"></a>00050 <span class="comment"> * function. This function is called whenever an uIP event occurs</span>
<a name="l00051"></a>00051 <span class="comment"> * (e.g. when a new connection is established, new data arrives, sent</span>
<a name="l00052"></a>00052 <span class="comment"> * data is acknowledged, data needs to be retransmitted, etc.).</span>
<a name="l00053"></a>00053 <span class="comment"> */</span>
<a name="l00054"></a>00054 <span class="keywordtype">void</span>
<a name="l00055"></a><a class="code" href="a00162.html#g03070adbf8faab0f34f87c1270964306">00055</a> <a class="code" href="a00162.html#g03070adbf8faab0f34f87c1270964306">hello_world_appcall</a>(<span class="keywordtype">void</span>)
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057   <span class="comment">/*</span>
<a name="l00058"></a>00058 <span class="comment">   * The uip_conn structure has a field called "appstate" that holds</span>
<a name="l00059"></a>00059 <span class="comment">   * the application state of the connection. We make a pointer to</span>
<a name="l00060"></a>00060 <span class="comment">   * this to access it easier.</span>
<a name="l00061"></a>00061 <span class="comment">   */</span>
<a name="l00062"></a>00062   <span class="keyword">struct </span><a class="code" href="a00078.html">hello_world_state</a> *s = &amp;(<a class="code" href="a00088.html">uip_conn</a>-&gt;appstate);
<a name="l00063"></a>00063 
<a name="l00064"></a>00064   <span class="comment">/*</span>
<a name="l00065"></a>00065 <span class="comment">   * If a new connection was just established, we should initialize</span>
<a name="l00066"></a>00066 <span class="comment">   * the protosocket in our applications' state structure.</span>
<a name="l00067"></a>00067 <span class="comment">   */</span>
<a name="l00068"></a>00068   <span class="keywordflow">if</span>(<a class="code" href="a00147.html#gdb971fb1525d0c5002f52125b05f3218">uip_connected</a>()) {
<a name="l00069"></a>00069     <a class="code" href="a00158.html#g26ae707402e494f3895a9f012a93ea29">PSOCK_INIT</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>, s-&gt;<a class="code" href="a00078.html#4b1b1436b50ed7638aece35f41421196">inputbuffer</a>, <span class="keyword">sizeof</span>(s-&gt;<a class="code" href="a00078.html#4b1b1436b50ed7638aece35f41421196">inputbuffer</a>));
<a name="l00070"></a>00070   }
<a name="l00071"></a>00071 
<a name="l00072"></a>00072   <span class="comment">/*</span>
<a name="l00073"></a>00073 <span class="comment">   * Finally, we run the protosocket function that actually handles</span>
<a name="l00074"></a>00074 <span class="comment">   * the communication. We pass it a pointer to the application state</span>
<a name="l00075"></a>00075 <span class="comment">   * of the current connection.</span>
<a name="l00076"></a>00076 <span class="comment">   */</span>
<a name="l00077"></a>00077   handle_connection(s);
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00080"></a>00080 <span class="comment">/*</span>
<a name="l00081"></a>00081 <span class="comment"> * This is the protosocket function that handles the communication. A</span>
<a name="l00082"></a>00082 <span class="comment"> * protosocket function must always return an int, but must never</span>
<a name="l00083"></a>00083 <span class="comment"> * explicitly return - all return statements are hidden in the PSOCK</span>
<a name="l00084"></a>00084 <span class="comment"> * macros.</span>
<a name="l00085"></a>00085 <span class="comment"> */</span>
<a name="l00086"></a>00086 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00087"></a>00087 handle_connection(<span class="keyword">struct</span> <a class="code" href="a00078.html">hello_world_state</a> *s)
<a name="l00088"></a>00088 {
<a name="l00089"></a>00089   <a class="code" href="a00158.html#g84901a5aa60040e96d272a69977edd22">PSOCK_BEGIN</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>);
<a name="l00090"></a>00090 
<a name="l00091"></a>00091   <a class="code" href="a00158.html#gb0ad55aa96dd1d200cd0fc5a99f6a4f7">PSOCK_SEND_STR</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>, <span class="stringliteral">"Hello. What is your name?\n"</span>);
<a name="l00092"></a>00092   <a class="code" href="a00158.html#gb5d9c0becf7cb32d0aaef466839dd92e">PSOCK_READTO</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>, <span class="charliteral">'\n'</span>);
<a name="l00093"></a>00093   strncpy(s-&gt;<a class="code" href="a00078.html#4da86e9feb5e5835eb15163c2cb61116">name</a>, s-&gt;<a class="code" href="a00078.html#4b1b1436b50ed7638aece35f41421196">inputbuffer</a>, <span class="keyword">sizeof</span>(s-&gt;<a class="code" href="a00078.html#4da86e9feb5e5835eb15163c2cb61116">name</a>));
<a name="l00094"></a>00094   <a class="code" href="a00158.html#gb0ad55aa96dd1d200cd0fc5a99f6a4f7">PSOCK_SEND_STR</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>, <span class="stringliteral">"Hello "</span>);
<a name="l00095"></a>00095   <a class="code" href="a00158.html#gb0ad55aa96dd1d200cd0fc5a99f6a4f7">PSOCK_SEND_STR</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>, s-&gt;<a class="code" href="a00078.html#4da86e9feb5e5835eb15163c2cb61116">name</a>);
<a name="l00096"></a>00096   <a class="code" href="a00158.html#g5d56800f82bfc7bbf53bb4a659589812">PSOCK_CLOSE</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>);
<a name="l00097"></a>00097   
<a name="l00098"></a>00098   <a class="code" href="a00158.html#g4a264bb64ae706d53f572b1d9e4037a2">PSOCK_END</a>(&amp;s-&gt;<a class="code" href="a00078.html#a9825b5977b2d4dec66e6bd09e6ae6ea">p</a>);
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100 <span class="comment">/*---------------------------------------------------------------------------*/</span>
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