]>
Commit | Line | Data |
---|---|---|
663996b3 MS |
1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>sd_get_seats</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style> |
2 | a.headerlink { | |
3 | color: #c60f0f; | |
4 | font-size: 0.8em; | |
5 | padding: 0 4px 0 4px; | |
6 | text-decoration: none; | |
7 | visibility: hidden; | |
8 | } | |
9 | ||
10 | a.headerlink:hover { | |
11 | background-color: #c60f0f; | |
12 | color: white; | |
13 | } | |
14 | ||
15 | h1:hover > a.headerlink, h2:hover > a.headerlink, h3:hover > a.headerlink, dt:hover > a.headerlink { | |
16 | visibility: visible; | |
17 | } | |
18 | </style><a href="index.html">Index </a>· | |
19 | <a href="systemd.directives.html">Directives </a>· | |
20 | <a href="../python-systemd/index.html">Python </a>· | |
21 | <a href="../libudev/index.html">libudev </a>· | |
14228c0d | 22 | <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 208</span><hr><div class="refentry"><a name="sd_get_seats"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_get_seats, sd_get_sessions, sd_get_uids, sd_get_machine_names — Determine available seats, sessions, logged in users and virtual machines/containers</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-login.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_get_seats</b>(</code></td><td>char*** <var class="pdparam">seats</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_get_sessions</b>(</code></td><td>char*** <var class="pdparam">sessions</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_get_uids</b>(</code></td><td>uid_t** <var class="pdparam">users</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_get_machine_names</b>(</code></td><td>char*** <var class="pdparam">machines</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm274687208976"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_get_seats()</code> may be used |
663996b3 | 23 | to determine all currently available local |
14228c0d | 24 | seats. Returns a <code class="constant">NULL</code> terminated array of seat |
663996b3 MS |
25 | identifiers. The returned array and all strings it |
26 | references need to be freed with the libc | |
27 | <a href="free.html"><span class="citerefentry"><span class="refentrytitle">free</span>(3)</span></a> | |
28 | call after use. Note that instead of an empty array | |
14228c0d | 29 | <code class="constant">NULL</code> may be returned and should be considered |
663996b3 MS |
30 | equivalent to an empty array.</p><p>Similar, <code class="function">sd_get_sessions()</code> may |
31 | be used to determine all current login sessions.</p><p>Similar, <code class="function">sd_get_uids()</code> may | |
32 | be used to determine all Unix users who currently have login sessions.</p><p>Similar, | |
33 | <code class="function">sd_get_machine_names()</code> may be | |
34 | used to determine all current virtual machines and | |
14228c0d | 35 | containers on the system.</p><p>Note that the returned lists are not sorted and in an undefined order.</p></div><div class="refsect1"><a name="idm274691159552"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p>On success <code class="function">sd_get_seats()</code>, |
663996b3 MS |
36 | <code class="function">sd_get_sessions()</code>, |
37 | <code class="function">sd_get_uids()</code> and | |
38 | <code class="function">sd_get_machine_names()</code> return the | |
39 | number of entries in the arrays. On failure, these | |
14228c0d | 40 | calls return a negative errno-style error code.</p></div><div class="refsect1"><a name="idm274691155328"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>The <code class="function">sd_get_seats()</code>, |
663996b3 MS |
41 | <code class="function">sd_get_sessions()</code>, |
42 | <code class="function">sd_get_uids()</code> and | |
43 | <code class="function">sd_get_machine_names()</code> interfaces | |
44 | are available as shared library, which can be compiled | |
45 | and linked to with the | |
14228c0d MB |
46 | <code class="constant">libsystemd-login</code> <a href="pkg-config.html"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a> |
47 | file.</p></div><div class="refsect1"><a name="idm274691149776"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> | |
663996b3 MS |
48 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>, |
49 | <a href="sd-login.html"><span class="citerefentry"><span class="refentrytitle">sd-login</span>(3)</span></a>, | |
50 | <a href="sd_session_get_seat.html"><span class="citerefentry"><span class="refentrytitle">sd_session_get_seat</span>(3)</span></a> | |
51 | </p></div></div></body></html> |