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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<h1>Lua-System</h1>
<h2>Contents</h2>
<ul>
<li><a href="#environment_Functions">environment Functions</a></li>
<li><a href="#random_Functions">random Functions</a></li>
<li><a href="#term_Functions">term Functions</a></li>
<li><a href="#time_Functions">time Functions</a></li>
</ul>
<h2>Modules</h2>
<ul class="nowrap">
<li><strong>system</strong></li>
</ul>
<h2>Topics</h2>
<ul class="">
<li><a href="topics/01-introduction.md.html">1. Introduction</a></li>
<li><a href="topics/CHANGELOG.md.html">CHANGELOG</a></li>
<li><a href="topics/LICENSE.md.html">MIT License</a></li>
</ul>
</div>
<div id="content">
<h1>Module <code>system</code></h1>
<p>Platform independent system calls for Lua.</p>
<p>
</p>
<h2><a href="#environment_Functions">environment Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#getenv">getenv (name)</a></td>
<td class="summary">Gets the value of an environment variable.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#getenvs">getenvs ()</a></td>
<td class="summary">Returns a table with all environment variables.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#setenv">setenv (name[, value])</a></td>
<td class="summary">Sets an environment variable.</td>
</tr>
</table>
<h2><a href="#random_Functions">random Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#random">random ([length=1])</a></td>
<td class="summary">Generate random bytes.</td>
</tr>
</table>
<h2><a href="#term_Functions">term Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#isatty">isatty (file)</a></td>
<td class="summary">Checks if a file-handle is a TTY.</td>
</tr>
</table>
<h2><a href="#time_Functions">time Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#gettime">gettime ()</a></td>
<td class="summary">Get system time.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#monotime">monotime ()</a></td>
<td class="summary">Get monotonic time.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#sleep">sleep (seconds[, precision=16])</a></td>
<td class="summary">Sleep without a busy loop.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="environment_Functions"></a>environment Functions</h2>
<dl class="function">
<dt>
<a name = "getenv"></a>
<strong>getenv (name)</strong>
</dt>
<dd>
Gets the value of an environment variable. </p>
<p><strong>NOTE</strong>: Windows has multiple copies of environment variables. For this reason,
the <a href="index.html#setenv">setenv</a> function will not work with Lua's <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.getenv">os.getenv</a> on Windows. If you want
to use <a href="index.html#setenv">setenv</a> then consider patching <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.getenv">os.getenv</a> with this implementation of <a href="index.html#getenv">getenv</a>.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">name</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
name of the environment variable
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a> or <span class="type">nil</span></span>
value of the environment variable, or nil if the variable is not set
</ol>
</dd>
<dt>
<a name = "getenvs"></a>
<strong>getenvs ()</strong>
</dt>
<dd>
Returns a table with all environment variables.
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.5">table</a></span>
table with all environment variables and their values
</ol>
</dd>
<dt>
<a name = "setenv"></a>
<strong>setenv (name[, value])</strong>
</dt>
<dd>
Sets an environment variable. </p>
<p><strong>NOTE</strong>: Windows has multiple copies of environment variables. For this reason, the
<a href="index.html#setenv">setenv</a> function will not work with Lua's <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.getenv">os.getenv</a> on Windows. If you want to use
it then consider patching <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.getenv">os.getenv</a> with the implementation of <a href="index.html#getenv">system.getenv</a>.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">name</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
name of the environment variable
</li>
<li><span class="parameter">value</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
value of the environment variable, if <code>nil</code> the variable will be deleted (on
Windows, setting an empty string, will also delete the variable)
(<em>optional</em>)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">boolean</span></span>
success
</ol>
</dd>
</dl>
<h2 class="section-header "><a name="random_Functions"></a>random Functions</h2>
<dl class="function">
<dt>
<a name = "random"></a>
<strong>random ([length=1])</strong>
</dt>
<dd>
Generate random bytes.
This uses <code>CryptGenRandom()</code> on Windows, and <code>/dev/urandom</code> on other platforms. It will return the
requested number of bytes, or an error, never a partial result.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">length</span>
<span class="types"><span class="type">int</span></span>
number of bytes to get
(<em>default</em> 1)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
string of random bytes
</ol>
<h3>Or</h3>
<ol>
<li>
<span class="types"><span class="type">nil</span></span>
</li>
<li>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
error message</li>
</ol>
</dd>
</dl>
<h2 class="section-header "><a name="term_Functions"></a>term Functions</h2>
<dl class="function">
<dt>
<a name = "isatty"></a>
<strong>isatty (file)</strong>
</dt>
<dd>
Checks if a file-handle is a TTY.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">file</span>
<span class="types"><span class="type">file</span></span>
the file-handle to check
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">boolean</span></span>
true if the file is a tty
</ol>
</dd>
</dl>
<h2 class="section-header "><a name="time_Functions"></a>time Functions</h2>
<dl class="function">
<dt>
<a name = "gettime"></a>
<strong>gettime ()</strong>
</dt>
<dd>
Get system time.
The time is returned as the seconds since the epoch (1 January 1970 00:00:00).
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">number</span></span>
seconds (fractional)
</ol>
</dd>
<dt>
<a name = "monotime"></a>
<strong>monotime ()</strong>
</dt>
<dd>
Get monotonic time.
The time is returned as the seconds since system start.
<h3>Returns:</h3>
<ol>
<span class="types"><span class="type">number</span></span>
seconds (fractional)
</ol>
</dd>
<dt>
<a name = "sleep"></a>
<strong>sleep (seconds[, precision=16])</strong>
</dt>
<dd>
Sleep without a busy loop.
This function will sleep, without doing a busy-loop and wasting CPU cycles.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">seconds</span>
<span class="types"><span class="type">number</span></span>
seconds to sleep (fractional).
</li>
<li><span class="parameter">precision</span>
<span class="types"><span class="type">integer</span></span>
minimum stepsize in milliseconds (Windows only, ignored elsewhere)
(<em>default</em> 16)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<code>true</code> on success, or <code>nil+err</code> on failure
</ol>
</dd>
</dl>
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