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<!DOCTYPE html><html><head><meta charset="utf-8" /><meta content="IE=edge" http-equiv="X-UA-Compatible" /><meta content="width=device-width, initial-scale=1, maximum-scale=2.0, user-scalable=yes, minimal-ui=yes" name="viewport" /><title>facil.io - a mini-framework for C web applications</title><meta content="facil.io - a mini-framework for C web applications" name="description" /><link href="https://fonts.googleapis.com/css?family=Montserrat|Quicksand|Karla" rel="stylesheet" type="text/css" /><script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script><link href="/assets/styles/main.css" rel="stylesheet" type="text/css" /><script type="application/ld+json">{"@context":"http://schema.org","@type":"WebSite","url":"http://facil.io","name":"facil.io","description":"facil.io - a light web application framework in C, with support for HTTP, WebSockets and Pub/Sub out of the box.","keywords":"C, web, framework, websockets, websocket, realtime, real-time, easy","image":"http://facil.io/website/logo/facil-io.svg","author":[{"@type":"Person","name":"Bo (Myst)","url":"http://stackoverflow.com/users/4025095/myst","email":"bo(at)facil.io"}],"sourceOrganization":{"@context":"http://schema.org","@type":"Organization","name":"Plezi","url":"http://facil.io","description":"facil.io - a light web application framework in C, with support for HTTP, WebSockets and Pub/Sub out of the box.","logo":"http://facil.io/website/logo/facil-io.svg","image":"http://facil.io/website/logo/facil-io.svg","email":"bo(at)facil.io","member":[{"@type":"Person","name":"Bo (Myst)","url":"http://stackoverflow.com/users/4025095/myst","email":"bo(at)facil.io"}]}}</script><link href="/assets/logo/facil-io-logo.svg" rel="icon" sizes="350x350" type="image/svg" /><link href="/assets/logo/facil-io-logo.png" rel="icon" sizes="350x350" type="image/png" /><link href="/assets/logo/facil-io-logo.svg" rel="shortcut icon" sizes="350x350" type="image/svg" /><link href="/assets/logo/facil-io-logo.png" rel="shortcut icon" sizes="350x350" type="image/png" /><link href="/assets/logo/facil-io-logo.svg" rel="apple-touch-icon" sizes="350x350" type="image/svg" /><link href="/assets/logo/facil-io-logo.png" rel="apple-touch-icon" sizes="350x350" type="image/png" /><link href="/assets/logo/facil-io-logo.svg" rel="fluid-icon" sizes="350x350" type="image/svg" /><link href="/assets/logo/facil-io-logo.png" rel="fluid-icon" sizes="350x350" type="image/png" /><link href="/manifest.json" rel="manifest" /><meta content="facil.io" name="apple-mobile-web-app-title" /><meta content="facil.io - the C Web Application Framework" name="application-name" /><meta content="#b91d47" name="msapplication-TileColor" /><meta content="/mstile-144x144.png" name="msapplication-TileImage" /><meta content="#ffffff" name="theme-color" /></head><body><a href="/" id="logo"></a><input id="show_nav" type="checkbox" /><nav id="top_nav"><ul><li><a href="/0.7.x/index">Latest Docs</a></li><li><a href="https://github.com/boazsegev/facil.io" target="_blank">Source Code</a></li><li><a href="javascript: change_themes();" id="theme">Night Theme</a></li></ul></nav><input id="show_sidebar" type="checkbox" /><nav id="side_bar"><h2 id="version-0-7-x"><a href="/0.7.x/index">Version 0.7.x</a></h2>
<h3 id="core-library"><a href="/0.7.x/fio">Core Library</a></h3>
<ul>
<li><a href="/0.7.x/fio#connection-protocol-management">Protocol Management</a></li>
<li><a href="/0.7.x/fio#running-facil-io">Running the IO reactor</a></li>
<li><a href="/0.7.x/fio#socket-connection-functions">Connection Functions</a></li>
<li><a href="/0.7.x/fio#event-task-scheduling">Event / Task Scheduling</a></li>
<li><a href="/0.7.x/fio#pub-sub-services">Pub/Sub Services</a></li>
<li><a href="/0.7.x/fio#the-custom-memory-allocator">Memory Allocation</a></li>
<li><a href="/0.7.x/fio#general-helpers">General Helpers</a></li>
<li><a href="/0.7.x/fio#linked-lists">Linked Lists</a></li>
<li><a href="/0.7.x/fio#string-helpers">String Helpers</a></li>
<li><a href="/0.7.x/fio#dynamic-arrays">Dynamic Arrays</a></li>
<li><a href="/0.7.x/fio#hash-maps-sets">Hash Maps / Sets</a></li>
<li><a href="/0.7.x/fio#version-and-compilation-related-macros">Compilation Macros</a></li>
<li><a href="/0.7.x/fio#weak-functions">Weak Functions</a></li>
</ul>
<h3 id="extensions"><a href="/0.7.x/extensions">Extensions</a></h3>
<!-- * [TLS (SSL)](/0.7.x/fio_tls) -->
<ul>
<li><a href="/0.7.x/http">HTTP / WebSockets</a></li>
<li><a href="/0.7.x/redis">Redis (client)</a></li>
<li><a href="/0.7.x/fio_cli">CLI (command line)</a></li>
</ul>
<h3 id="the-fiobj-types"><a href="/0.7.x/fiobj">The FIOBJ types</a></h3>
<ul>
<li><a href="/0.7.x/fiobj_core">Core Functions</a></li>
<li><a href="/0.7.x/fiobj_primitives">Primitives</a></li>
<li><a href="/0.7.x/fiobj_numbers">Numbers</a></li>
<li><a href="/0.7.x/fiobj_str">Strings</a></li>
<li><a href="/0.7.x/fiobj_ary">Array</a></li>
<li><a href="/0.7.x/fiobj_hash">HashMap</a></li>
<li><a href="/0.7.x/fiobj_data">Data Streams</a></li>
<li><a href="/0.7.x/fiobj_json">JSON</a></li>
<li><a href="/0.7.x/fiobj_mustache">Mustache</a></li>
</ul>
<h3 id="miscellaneous">Miscellaneous</h3>
<ul>
<li><a href="/0.7.x/riskyhash">Risk Hash</a></li>
</ul>
</nav><div id="md_container"><h1 id="facil-io-a-mini-framework-for-c-web-applications">facil.io - a mini-framework for C web applications</h1>
<p>A Web application in C? It&#39;s as easy as:</p>
<div class="highlight"><pre class="highlight c"><code><span class="cp">#include "http.h" </span><span class="cm">/* the HTTP facil.io extension */</span><span class="cp">
</span>
<span class="c1">// We'll use this callback in `http_listen`, to handles HTTP requests</span>
<span class="kt">void</span> <span class="n">on_request</span><span class="p">(</span><span class="n">http_s</span> <span class="o">*</span><span class="n">request</span><span class="p">);</span>
<span class="c1">// These will contain pre-allocated values that we will use often</span>
<span class="n">FIOBJ</span> <span class="n">HTTP_HEADER_X_DATA</span><span class="p">;</span>
<span class="c1">// Listen to HTTP requests and start facil.io</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="k">const</span> <span class="o">**</span><span class="n">argv</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// allocating values we use often</span>
<span class="n">HTTP_HEADER_X_DATA</span> <span class="o">=</span> <span class="n">fiobj_str_new</span><span class="p">(</span><span class="s">"X-Data"</span><span class="p">,</span> <span class="mi">6</span><span class="p">);</span>
<span class="c1">// listen on port 3000 and any available network binding (NULL == 0.0.0.0)</span>
<span class="n">http_listen</span><span class="p">(</span><span class="s">"3000"</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="p">.</span><span class="n">on_request</span> <span class="o">=</span> <span class="n">on_request</span><span class="p">,</span> <span class="p">.</span><span class="n">log</span> <span class="o">=</span> <span class="mi">1</span><span class="p">);</span>
<span class="c1">// start the server</span>
<span class="n">fio_start</span><span class="p">(.</span><span class="n">threads</span> <span class="o">=</span> <span class="mi">1</span><span class="p">);</span>
<span class="c1">// deallocating the common values</span>
<span class="n">fiobj_free</span><span class="p">(</span><span class="n">HTTP_HEADER_X_DATA</span><span class="p">);</span>
<span class="c1">// these can be used, but we're ignoring them here.</span>
<span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="n">argc</span><span class="p">;</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="n">argv</span><span class="p">;</span>
<span class="p">}</span>
<span class="c1">// Easy HTTP handling</span>
<span class="kt">void</span> <span class="nf">on_request</span><span class="p">(</span><span class="n">http_s</span> <span class="o">*</span><span class="n">request</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http_set_cookie</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="p">.</span><span class="n">name</span> <span class="o">=</span> <span class="s">"my_cookie"</span><span class="p">,</span> <span class="p">.</span><span class="n">name_len</span> <span class="o">=</span> <span class="mi">9</span><span class="p">,</span> <span class="p">.</span><span class="n">value</span> <span class="o">=</span> <span class="s">"data"</span><span class="p">,</span>
<span class="p">.</span><span class="n">value_len</span> <span class="o">=</span> <span class="mi">4</span><span class="p">);</span>
<span class="n">http_set_header</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="n">HTTP_HEADER_CONTENT_TYPE</span><span class="p">,</span>
<span class="n">http_mimetype_find</span><span class="p">(</span><span class="s">"txt"</span><span class="p">,</span> <span class="mi">3</span><span class="p">));</span>
<span class="n">http_set_header</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="n">HTTP_HEADER_X_DATA</span><span class="p">,</span> <span class="n">fiobj_str_new</span><span class="p">(</span><span class="s">"my data"</span><span class="p">,</span> <span class="mi">7</span><span class="p">));</span>
<span class="n">http_send_body</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="s">"Hello World!</span><span class="se">\r\n</span><span class="s">"</span><span class="p">,</span> <span class="mi">14</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
<h2 id="facil-io-more-than-a-powerful-http-websockets-server-library">facil.io - more than a powerful HTTP/Websockets server library.</h2>
<p><a href="http://facil.io">facil.io</a> is an evented Network library written in C. It provides high performance TCP/IP network services by using an evented design that was tested to provide an easy solution to <a href="http://www.kegel.com/c10k.html">the C10K problem</a>.</p>
<p><a href="http://facil.io">facil.io</a> includes a mini-framework for Web Applications, with a fast HTTP / WebSocket server, integrated Pub/Sub, optional Redis connectivity, easy JSON handling, <a href="http://mustache.github.io">Mustache</a> template rendering and more nifty tidbits.</p>
<p><a href="http://facil.io">facil.io</a> powers the <a href="https://github.com/boazsegev/iodine">HTTP/Websockets Ruby Iodine server</a> and it can easily power your application as well.</p>
<p><a href="http://facil.io">facil.io</a> should work on Linux / BSD / macOS (and possibly CYGWIN) and is continuously tested on both Linux and macOS.</p>
<p><a href="http://facil.io">facil.io</a> is a source code library, making it easy to incorporate into any project. The API was designed for simplicity and extendability, which means writing new extensions and custom network protocols is easy.</p>
<p><a href="http://facil.io">facil.io</a>&#39;s core library is a two-file library (<code>fio.h</code> and <code>fio.c</code>), making it easy to incorporate networking solutions into any project.</p>
<p><a href="http://facil.io">facil.io</a> supports both single-threaded and multi-threaded operation modes as well as a hybrid mode (multi-process with either a single-threaded or multi-threaded workers).</p>
<p>I used this library (including the HTTP server) on Linux, Mac OS X and FreeBSD (I had to edit the <code>makefile</code> for each environment).</p>
<h2 id="an-easy-chat-room-example">An easy chat-room example</h2>
<p>Here&#39;s a simple WebSocket chat-room example:</p>
<div class="highlight"><pre class="highlight c"><code><span class="cp">#include "fio_cli.h"
#include "http.h"
</span>
<span class="cm">/* Chat-room channel name */</span>
<span class="k">static</span> <span class="n">fio_str_info_s</span> <span class="n">CHAT_CHANNEL</span> <span class="o">=</span> <span class="p">{.</span><span class="n">len</span> <span class="o">=</span> <span class="mi">8</span><span class="p">,</span> <span class="p">.</span><span class="n">data</span> <span class="o">=</span> <span class="s">"chatroom"</span><span class="p">};</span>
<span class="cm">/* *****************************************************************************
WebSocket callbacks
***************************************************************************** */</span>
<span class="cm">/* We'll subscribe to the channel's chat channel when a new connection opens */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">on_open_websocket</span><span class="p">(</span><span class="n">ws_s</span> <span class="o">*</span><span class="n">ws</span><span class="p">)</span> <span class="p">{</span>
<span class="cm">/* subscription - easy as pie */</span>
<span class="n">websocket_subscribe</span><span class="p">(</span><span class="n">ws</span><span class="p">,</span> <span class="p">.</span><span class="n">channel</span> <span class="o">=</span> <span class="n">CHAT_CHANNEL</span><span class="p">,</span> <span class="p">.</span><span class="n">force_text</span> <span class="o">=</span> <span class="mi">1</span><span class="p">);</span>
<span class="cm">/* notify everyone about new (named) visitors */</span>
<span class="n">FIOBJ</span> <span class="n">nickname</span> <span class="o">=</span> <span class="p">(</span><span class="n">FIOBJ</span><span class="p">)</span><span class="n">websocket_udata_get</span><span class="p">(</span><span class="n">ws</span><span class="p">);</span>
<span class="n">fio_str_info_s</span> <span class="n">n</span> <span class="o">=</span> <span class="n">fiobj_obj2cstr</span><span class="p">(</span><span class="n">nickname</span><span class="p">);</span>
<span class="n">FIOBJ</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">fiobj_str_new</span><span class="p">(</span><span class="n">n</span><span class="p">.</span><span class="n">data</span><span class="p">,</span> <span class="n">n</span><span class="p">.</span><span class="n">len</span><span class="p">);</span>
<span class="n">fiobj_str_write</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="s">" joined the chat."</span><span class="p">,</span> <span class="mi">17</span><span class="p">);</span>
<span class="n">pubsub_publish</span><span class="p">(.</span><span class="n">channel</span> <span class="o">=</span> <span class="n">CHAT_CHANNEL</span><span class="p">,</span> <span class="p">.</span><span class="n">message</span> <span class="o">=</span> <span class="n">fiobj_obj2cstr</span><span class="p">(</span><span class="n">msg</span><span class="p">));</span>
<span class="cm">/* cleanup */</span>
<span class="n">fiobj_free</span><span class="p">(</span><span class="n">msg</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* Free the nickname, if any. */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">on_close_websocket</span><span class="p">(</span><span class="kt">intptr_t</span> <span class="n">uuid</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">udata</span><span class="p">)</span> <span class="p">{</span>
<span class="n">FIOBJ</span> <span class="n">nickname</span> <span class="o">=</span> <span class="p">(</span><span class="n">FIOBJ</span><span class="p">)</span><span class="n">udata</span><span class="p">;</span>
<span class="n">fio_str_info_s</span> <span class="n">n</span> <span class="o">=</span> <span class="n">fiobj_obj2cstr</span><span class="p">(</span><span class="n">nickname</span><span class="p">);</span>
<span class="cm">/* send notification */</span>
<span class="n">FIOBJ</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">fiobj_str_new</span><span class="p">(</span><span class="n">n</span><span class="p">.</span><span class="n">data</span><span class="p">,</span> <span class="n">n</span><span class="p">.</span><span class="n">len</span><span class="p">);</span>
<span class="n">fiobj_str_write</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="s">" left the chat."</span><span class="p">,</span> <span class="mi">15</span><span class="p">);</span>
<span class="n">fio_publish</span><span class="p">(.</span><span class="n">channel</span> <span class="o">=</span> <span class="n">CHAT_CHANNEL</span><span class="p">,</span> <span class="p">.</span><span class="n">message</span> <span class="o">=</span> <span class="n">fiobj_obj2cstr</span><span class="p">(</span><span class="n">msg</span><span class="p">));</span>
<span class="cm">/* cleanup */</span>
<span class="n">fiobj_free</span><span class="p">(</span><span class="n">msg</span><span class="p">);</span>
<span class="n">fiobj_free</span><span class="p">(</span><span class="n">nickname</span><span class="p">);</span>
<span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="n">uuid</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Received a message from a client, format message for chat . */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">handle_websocket_messages</span><span class="p">(</span><span class="n">ws_s</span> <span class="o">*</span><span class="n">ws</span><span class="p">,</span> <span class="n">fio_str_info_s</span> <span class="n">data</span><span class="p">,</span>
<span class="kt">uint8_t</span> <span class="n">is_text</span><span class="p">)</span> <span class="p">{</span>
<span class="n">FIOBJ</span> <span class="n">nickname</span> <span class="o">=</span> <span class="p">(</span><span class="n">FIOBJ</span><span class="p">)</span><span class="n">websocket_udata_get</span><span class="p">(</span><span class="n">ws</span><span class="p">);</span>
<span class="n">fio_str_info_s</span> <span class="n">n</span> <span class="o">=</span> <span class="n">fiobj_obj2cstr</span><span class="p">(</span><span class="n">nickname</span><span class="p">);</span>
<span class="cm">/* allocates a dynamic string. knowing the buffer size is faster */</span>
<span class="n">FIOBJ</span> <span class="n">msg</span> <span class="o">=</span> <span class="n">fiobj_str_buf</span><span class="p">(</span><span class="n">n</span><span class="p">.</span><span class="n">len</span> <span class="o">+</span> <span class="mi">2</span> <span class="o">+</span> <span class="n">data</span><span class="p">.</span><span class="n">len</span><span class="p">);</span>
<span class="n">fiobj_str_write</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">n</span><span class="p">.</span><span class="n">data</span><span class="p">,</span> <span class="n">n</span><span class="p">.</span><span class="n">len</span><span class="p">);</span>
<span class="n">fiobj_str_write</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="s">": "</span><span class="p">,</span> <span class="mi">2</span><span class="p">);</span>
<span class="n">fiobj_str_write</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">data</span><span class="p">.</span><span class="n">data</span><span class="p">,</span> <span class="n">data</span><span class="p">.</span><span class="n">len</span><span class="p">);</span>
<span class="n">fio_publish</span><span class="p">(.</span><span class="n">channel</span> <span class="o">=</span> <span class="n">CHAT_CHANNEL</span><span class="p">,</span> <span class="p">.</span><span class="n">message</span> <span class="o">=</span> <span class="n">fiobj_obj2cstr</span><span class="p">(</span><span class="n">msg</span><span class="p">));</span>
<span class="n">fiobj_free</span><span class="p">(</span><span class="n">msg</span><span class="p">);</span>
<span class="p">(</span><span class="kt">void</span><span class="p">)(</span><span class="n">ws</span><span class="p">);</span>
<span class="p">(</span><span class="kt">void</span><span class="p">)(</span><span class="n">is_text</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* *****************************************************************************
HTTP Handling (Upgrading to WebSocket)
***************************************************************************** */</span>
<span class="cm">/* Answers simple HTTP requests */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">answer_http_request</span><span class="p">(</span><span class="n">http_s</span> <span class="o">*</span><span class="n">h</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http_set_header2</span><span class="p">(</span><span class="n">h</span><span class="p">,</span> <span class="p">(</span><span class="n">fio_str_info_s</span><span class="p">){.</span><span class="n">data</span> <span class="o">=</span> <span class="s">"Server"</span><span class="p">,</span> <span class="p">.</span><span class="n">len</span> <span class="o">=</span> <span class="mi">6</span><span class="p">},</span>
<span class="p">(</span><span class="n">fio_str_info_s</span><span class="p">){.</span><span class="n">data</span> <span class="o">=</span> <span class="s">"facil.example"</span><span class="p">,</span> <span class="p">.</span><span class="n">len</span> <span class="o">=</span> <span class="mi">13</span><span class="p">});</span>
<span class="n">http_set_header</span><span class="p">(</span><span class="n">h</span><span class="p">,</span> <span class="n">HTTP_HEADER_CONTENT_TYPE</span><span class="p">,</span> <span class="n">http_mimetype_find</span><span class="p">(</span><span class="s">"txt"</span><span class="p">,</span> <span class="mi">3</span><span class="p">));</span>
<span class="cm">/* this both sends the response and frees the http handler. */</span>
<span class="n">http_send_body</span><span class="p">(</span><span class="n">h</span><span class="p">,</span> <span class="s">"This is a simple Websocket chatroom example."</span><span class="p">,</span> <span class="mi">44</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* tests that the target protocol is "websockets" and upgrades the connection */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">answer_http_upgrade</span><span class="p">(</span><span class="n">http_s</span> <span class="o">*</span><span class="n">h</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">target</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">len</span><span class="p">)</span> <span class="p">{</span>
<span class="cm">/* test for target protocol name */</span>
<span class="k">if</span> <span class="p">(</span><span class="n">len</span> <span class="o">!=</span> <span class="mi">9</span> <span class="o">||</span> <span class="n">memcmp</span><span class="p">(</span><span class="n">target</span><span class="p">,</span> <span class="s">"websocket"</span><span class="p">,</span> <span class="mi">9</span><span class="p">))</span> <span class="p">{</span>
<span class="n">http_send_error</span><span class="p">(</span><span class="n">h</span><span class="p">,</span> <span class="mi">400</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">FIOBJ</span> <span class="n">n</span><span class="p">;</span>
<span class="n">fio_str_info_s</span> <span class="n">path</span> <span class="o">=</span> <span class="n">fiobj_obj2cstr</span><span class="p">(</span><span class="n">h</span><span class="o">-&gt;</span><span class="n">path</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">path</span><span class="p">.</span><span class="n">len</span> <span class="o">&gt;</span> <span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">n</span> <span class="o">=</span> <span class="n">fiobj_str_new</span><span class="p">(</span><span class="n">path</span><span class="p">.</span><span class="n">data</span> <span class="o">+</span> <span class="mi">1</span><span class="p">,</span> <span class="n">path</span><span class="p">.</span><span class="n">len</span> <span class="o">-</span> <span class="mi">1</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">n</span> <span class="o">=</span> <span class="n">fiobj_str_new</span><span class="p">(</span><span class="s">"Guest"</span><span class="p">,</span> <span class="mi">5</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">// Websocket upgrade will use our existing response.</span>
<span class="k">if</span> <span class="p">(</span><span class="n">http_upgrade2ws</span><span class="p">(</span>
<span class="n">h</span><span class="p">,</span> <span class="p">.</span><span class="n">on_open</span> <span class="o">=</span> <span class="n">on_open_websocket</span><span class="p">,</span> <span class="p">.</span><span class="n">on_close</span> <span class="o">=</span> <span class="n">on_close_websocket</span><span class="p">,</span>
<span class="p">.</span><span class="n">on_message</span> <span class="o">=</span> <span class="n">handle_websocket_messages</span><span class="p">,</span> <span class="p">.</span><span class="n">udata</span> <span class="o">=</span> <span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="p">)</span><span class="n">n</span><span class="p">))</span>
<span class="n">fiobj_free</span><span class="p">(</span><span class="n">n</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* *****************************************************************************
The main function
***************************************************************************** */</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="k">const</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="n">fio_cli_start</span><span class="p">(</span>
<span class="n">argc</span><span class="p">,</span> <span class="n">argv</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="s">"WebSocket chat room example using facil.io"</span><span class="p">,</span>
<span class="n">FIO_CLI_INT</span><span class="p">(</span><span class="s">"-t number of threads"</span><span class="p">),</span>
<span class="n">FIO_CLI_INT</span><span class="p">(</span><span class="s">"-w number of workers"</span><span class="p">),</span>
<span class="n">FIO_CLI_INT</span><span class="p">(</span><span class="s">"-p port number to listen on (0 == unix socket)"</span><span class="p">),</span>
<span class="n">FIO_CLI_STRING</span><span class="p">(</span><span class="s">"-b address binding"</span><span class="p">),</span>
<span class="n">FIO_CLI_STRING</span><span class="p">(</span><span class="s">"-www a public folder from which to serve files"</span><span class="p">),</span>
<span class="n">FIO_CLI_BOOL</span><span class="p">(</span><span class="s">"-v logs requests to STDERR"</span><span class="p">));</span>
<span class="n">fio_cli_set_default</span><span class="p">(</span><span class="s">"-p"</span><span class="p">,</span> <span class="s">"3000"</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">http_listen</span><span class="p">(</span><span class="n">fio_cli_get</span><span class="p">(</span><span class="s">"-p"</span><span class="p">),</span> <span class="n">fio_cli_get</span><span class="p">(</span><span class="s">"-b"</span><span class="p">),</span>
<span class="p">.</span><span class="n">on_request</span> <span class="o">=</span> <span class="n">answer_http_request</span><span class="p">,</span>
<span class="p">.</span><span class="n">on_upgrade</span> <span class="o">=</span> <span class="n">answer_http_upgrade</span><span class="p">,</span>
<span class="p">.</span><span class="n">log</span> <span class="o">=</span> <span class="n">fio_cli_get_bool</span><span class="p">(</span><span class="s">"-v"</span><span class="p">),</span>
<span class="p">.</span><span class="n">public_folder</span> <span class="o">=</span> <span class="n">fio_cli_get</span><span class="p">(</span><span class="s">"-www"</span><span class="p">))</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">perror</span><span class="p">(</span><span class="s">"Couldn't listen for HTTP / WebSocket connections"</span><span class="p">);</span>
<span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">fio_start</span><span class="p">(.</span><span class="n">threads</span> <span class="o">=</span> <span class="n">fio_cli_get_i</span><span class="p">(</span><span class="s">"-t"</span><span class="p">),</span> <span class="p">.</span><span class="n">workers</span> <span class="o">=</span> <span class="n">fio_cli_get_i</span><span class="p">(</span><span class="s">"-w"</span><span class="p">));</span>
<span class="n">fio_cli_end</span><span class="p">();</span>
<span class="p">}</span>
</code></pre></div>
<h2 id="further-reading">Further reading</h2>
<p>The code in this project is heavily commented and the header files could (and probably should) be used as the actual documentation.</p>
<p>However, experience shows that a quick reference guide is immensely helpful and that Doxygen documentation is ... well ... less helpful and harder to navigate (I&#39;ll leave it at that for now).</p>
<p>I hope you find the documentation on this website helpful.</p>
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