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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<h1>luaposix 36.3</h1>
<ul>
<li><a href="../index.html">Index</a></li>
</ul>
<h2>Contents</h2>
<ul>
<li><a href="#Functions">Functions</a></li>
<li><a href="#Tables">Tables</a></li>
</ul>
<h2>Modules</h2>
<ul class="nowrap">
<li><a href="../modules/posix.html">posix</a></li>
<li><a href="../modules/posix.ctype.html">posix.ctype</a></li>
<li><a href="../modules/posix.dirent.html">posix.dirent</a></li>
<li><a href="../modules/posix.errno.html">posix.errno</a></li>
<li><a href="../modules/posix.fcntl.html">posix.fcntl</a></li>
<li><a href="../modules/posix.fnmatch.html">posix.fnmatch</a></li>
<li><a href="../modules/posix.glob.html">posix.glob</a></li>
<li><strong>posix.grp</strong></li>
<li><a href="../modules/posix.libgen.html">posix.libgen</a></li>
<li><a href="../modules/posix.poll.html">posix.poll</a></li>
<li><a href="../modules/posix.pwd.html">posix.pwd</a></li>
<li><a href="../modules/posix.sched.html">posix.sched</a></li>
<li><a href="../modules/posix.signal.html">posix.signal</a></li>
<li><a href="../modules/posix.stdio.html">posix.stdio</a></li>
<li><a href="../modules/posix.stdlib.html">posix.stdlib</a></li>
<li><a href="../modules/posix.sys.msg.html">posix.sys.msg</a></li>
<li><a href="../modules/posix.sys.resource.html">posix.sys.resource</a></li>
<li><a href="../modules/posix.sys.socket.html">posix.sys.socket</a></li>
<li><a href="../modules/posix.sys.stat.html">posix.sys.stat</a></li>
<li><a href="../modules/posix.sys.statvfs.html">posix.sys.statvfs</a></li>
<li><a href="../modules/posix.sys.time.html">posix.sys.time</a></li>
<li><a href="../modules/posix.sys.times.html">posix.sys.times</a></li>
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<h2>Examples</h2>
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<li><a href="../examples/abstract-ns-client.lua.html">abstract-ns-client.lua</a></li>
<li><a href="../examples/abstract-ns-server.lua.html">abstract-ns-server.lua</a></li>
<li><a href="../examples/dir.lua.html">dir.lua</a></li>
<li><a href="../examples/dup2.lua.html">dup2.lua</a></li>
<li><a href="../examples/fork.lua.html">fork.lua</a></li>
<li><a href="../examples/fork2.lua.html">fork2.lua</a></li>
<li><a href="../examples/getopt.lua.html">getopt.lua</a></li>
<li><a href="../examples/glob.lua.html">glob.lua</a></li>
<li><a href="../examples/limit.lua.html">limit.lua</a></li>
<li><a href="../examples/lock.lua.html">lock.lua</a></li>
<li><a href="../examples/netlink-uevent.lua.html">netlink-uevent.lua</a></li>
<li><a href="../examples/packet-socket.lua.html">packet-socket.lua</a></li>
<li><a href="../examples/ping.lua.html">ping.lua</a></li>
<li><a href="../examples/poll.lua.html">poll.lua</a></li>
<li><a href="../examples/rt_sched.lua.html">rt_sched.lua</a></li>
<li><a href="../examples/signal.lua.html">signal.lua</a></li>
<li><a href="../examples/socket.lua.html">socket.lua</a></li>
<li><a href="../examples/termios.lua.html">termios.lua</a></li>
<li><a href="../examples/tree.lua.html">tree.lua</a></li>
</ul>
</div>
<div id="content">
<h1>Module <code>posix.grp</code></h1>
<p>Group Database Operations.</p>
<p> Query the system group database.</p>
<h3>See also:</h3>
<ul>
<a href="../modules/posix.pwd.html#">posix.pwd</a>
</ul>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#endgrent">endgrent ()</a></td>
<td class="summary">Release group database resources.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#getgrent">getgrent ()</a></td>
<td class="summary">Fetch next group.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#getgrgid">getgrgid (gid)</a></td>
<td class="summary">Fetch group with given group id.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#getgrnam">getgrnam (name)</a></td>
<td class="summary">Fetch named group.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#setgrent">setgrent ()</a></td>
<td class="summary">Rewind next <a href="../modules/posix.grp.html#getgrent">getgrent</a> back to start of database.</td>
</tr>
</table>
<h2><a href="#Tables">Tables</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#PosixGroup">PosixGroup</a></td>
<td class="summary">Group record.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "endgrent"></a>
<strong>endgrent ()</strong>
</dt>
<dd>
Release group database resources.
<h3>See also:</h3>
<ul>
<li><a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/endgrent.html">endgrent(3)</a></li>
<li><a href="../modules/posix.grp.html#getgrent">getgrent</a></li>
</ul>
</dd>
<dt>
<a name = "getgrent"></a>
<strong>getgrent ()</strong>
</dt>
<dd>
Fetch next group.
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="../modules/posix.grp.html#PosixGroup">PosixGroup</a></span>
next group record
</ol>
<h3>See also:</h3>
<ul>
<li><a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/getgrent.html">getgrent(3)</a></li>
<li><a href="../modules/posix.grp.html#endgrent">endgrent</a></li>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> grp = <span class="global">require</span> <span class="string">"posix.grp"</span>
t = grp.<span class="function-name">getgrent</span> ()
<span class="keyword">while</span> t ~= <span class="keyword">nil</span> <span class="keyword">do</span>
<span class="function-name">process</span> (t)
t = grp.<span class="function-name">getgrent</span> ()
<span class="keyword">end</span>
grp.<span class="function-name">endgrent</span> ()</pre>
</ul>
</dd>
<dt>
<a name = "getgrgid"></a>
<strong>getgrgid (gid)</strong>
</dt>
<dd>
Fetch group with given group id.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">gid</span>
<span class="types"><span class="type">int</span></span>
group id
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="../modules/posix.grp.html#PosixGroup">PosixGroup</a></span>
group record for <em>gid</em>, if successful
</ol>
<h3>Or</h3>
<ol>
<li>
nil</li>
<li>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
error message</li>
<li>
<span class="types"><span class="type">int</span></span>
errnum</li>
</ol>
<h3>See also:</h3>
<ul>
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/getgrgid.html">getgrgid(3)</a>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> grp = <span class="global">require</span> <span class="string">"posix.grp"</span>
t = grp.<span class="function-name">getgrgid</span> (<span class="number">0</span>)</pre>
</ul>
</dd>
<dt>
<a name = "getgrnam"></a>
<strong>getgrnam (name)</strong>
</dt>
<dd>
Fetch named group.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">name</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
group name
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="../modules/posix.grp.html#PosixGroup">PosixGroup</a></span>
group record for <em>name</em>, if successful
</ol>
<h3>Or</h3>
<ol>
<li>
nil</li>
<li>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
error message</li>
<li>
<span class="types"><span class="type">int</span></span>
errnum</li>
</ol>
<h3>See also:</h3>
<ul>
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/getgrnam.html">getgrnam(3)</a>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="keyword">local</span> grp = <span class="global">require</span> <span class="string">"posix.grp"</span>
t = grp.<span class="function-name">getgrnam</span> <span class="string">"wheel"</span></pre>
</ul>
</dd>
<dt>
<a name = "setgrent"></a>
<strong>setgrent ()</strong>
</dt>
<dd>
Rewind next <a href="../modules/posix.grp.html#getgrent">getgrent</a> back to start of database.
<h3>See also:</h3>
<ul>
<li><a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/setgrent.html">setgrent(3)</a></li>
<li><a href="../modules/posix.grp.html#getgrent">getgrent</a></li>
</ul>
</dd>
</dl>
<h2 class="section-header "><a name="Tables"></a>Tables</h2>
<dl class="function">
<dt>
<a name = "PosixGroup"></a>
<strong>PosixGroup</strong>
</dt>
<dd>
Group record.
<h3>Fields:</h3>
<ul>
<li><span class="parameter">gr_mem</span>
<span class="types"><span class="type">list</span></span>
a list of group members
</li>
<li><span class="parameter">gr_name</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
name of group
</li>
<li><span class="parameter">gr_gid</span>
<span class="types"><span class="type">int</span></span>
unique group id
</li>
</ul>
</dd>
</dl>
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<i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
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