]>
Commit | Line | Data |
---|---|---|
60f067b4 JS |
1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>sd_bus_new</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>· | |
e3bff60a | 22 | <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 220</span><hr><div class="refentry"><a name="sd_bus_new"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_bus_new, sd_bus_ref, sd_bus_unref — Create a new bus object and create or destroy references to it</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-bus.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_bus_new</b>(</code></td><td>sd_bus **<var class="pdparam">bus</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">sd_bus *<b class="fsfunc">sd_bus_ref</b>(</code></td><td>sd_bus *<var class="pdparam">bus</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">sd_bus *<b class="fsfunc">sd_bus_unref</b>(</code></td><td>sd_bus *<var class="pdparam">bus</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm140260182524960"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_bus_new()</code> creates a new bus |
60f067b4 JS |
23 | object. This object is reference-counted, and will be destroyed |
24 | when all references are gone. Initially, the caller of this | |
25 | function owns the sole reference.</p><p><code class="function">sd_bus_ref()</code> creates a new reference to | |
26 | <em class="parameter"><code>bus</code></em>. This bus object will not be destroyed | |
27 | until <code class="function">sd_bus_unref()</code> has been called as many | |
28 | times plus once more. Once the reference count has dropped to | |
29 | zero, <em class="parameter"><code>bus</code></em> cannot be used anymore, so | |
30 | further calls to <code class="function">sd_bus_ref()</code> or | |
31 | <code class="function">sd_bus_unref()</code> are illegal.</p><p><code class="function">sd_bus_unref()</code> destroys a reference to | |
e3bff60a | 32 | <em class="parameter"><code>bus</code></em>.</p></div><div class="refsect1"><a name="idm140260182517488"></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_bus_new()</code> returns 0 or a |
60f067b4 JS |
33 | positive integer. On failure, it returns a negative errno-style |
34 | error code.</p><p><code class="function">sd_bus_ref</code> always returns the argument. | |
35 | </p><p><code class="function">sd_bus_unref</code> always returns | |
e3bff60a | 36 | <code class="constant">NULL</code>.</p></div><div class="refsect1"><a name="idm140260182513456"></a><h2 id="Errors">Errors<a class="headerlink" title="Permalink to this headline" href="#Errors">¶</a></h2><p>Returned errors may indicate the following problems:</p><div class="variablelist"><dl class="variablelist"><dt id="-ENOMEM"><span class="term"><code class="constant">-ENOMEM</code></span><a class="headerlink" title="Permalink to this term" href="#-ENOMEM">¶</a></dt><dd><p>Memory allocation failed.</p></dd></dl></div></div><div class="refsect1"><a name="idm140260182510512"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p><code class="function">sd_bus_new()</code> and other functions |
60f067b4 JS |
37 | described here are available as a shared library, which can be |
38 | compiled and linked to with the | |
5eef597e | 39 | <code class="constant">libsystemd</code> <a href="http://linux.die.net/man/1/pkg-config"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a> |
e3bff60a | 40 | file.</p></div><div class="refsect1"><a name="idm140260182507328"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> |
60f067b4 JS |
41 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>, |
42 | <a href="sd-bus.html"><span class="citerefentry"><span class="refentrytitle">sd-bus</span>(3)</span></a>, | |
43 | <a href="sd_bus_open_user.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_open_user</span>(3)</span></a>, | |
44 | <a href="sd_bus_open_system.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_open_system</span>(3)</span></a>, | |
45 | <a href="sd_bus_default_user.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_default_user</span>(3)</span></a>, | |
46 | <a href="sd_bus_default_system.html"><span class="citerefentry"><span class="refentrytitle">sd_bus_default_system</span>(3)</span></a> | |
47 | </p></div></div></body></html> |