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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Owning bus names: GIO Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GIO Reference Manual"> <link rel="up" href="ch35.html" title="Migrating to GDBus"> <link rel="prev" href="ch35s02.html" title="API comparison"> <link rel="next" href="ch35s04.html" title="Creating proxies for well-known names"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="ch35.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="ch35s02.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="ch35s04.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="id-1.5.5.4"></a>Owning bus names</h2></div></div></div> <p> Using dbus-glib, you typically call RequestName manually to own a name, like in the following excerpt: </p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45</pre></td> <td class="listing_code"><pre class="programlisting"><span class="n">error</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span> <span class="n">res</span> <span class="o">=</span> <span class="n">dbus_g_proxy_call</span> <span class="p">(</span><span class="n">system_bus_proxy</span><span class="p">,</span> <span class="s">"RequestName"</span><span class="p">,</span> <span class="o">&</span><span class="n">error</span><span class="p">,</span> <span class="n">G_TYPE_STRING</span><span class="p">,</span> <span class="n">NAME_TO_CLAIM</span><span class="p">,</span> <span class="n">G_TYPE_UINT</span><span class="p">,</span> <span class="n">DBUS_NAME_FLAG_ALLOW_REPLACEMENT</span><span class="p">,</span> <span class="n">G_TYPE_INVALID</span><span class="p">,</span> <span class="n">G_TYPE_UINT</span><span class="p">,</span> <span class="o">&</span><span class="n">result</span><span class="p">,</span> <span class="n">G_TYPE_INVALID</span><span class="p">);</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span> <span class="k">if</span> <span class="p">(</span><span class="n">error</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span> <span class="n">g_warning</span> <span class="p">(</span><span class="s">"Failed to acquire %s: %s"</span><span class="p">,</span> <span class="n">NAME_TO_CLAIM</span><span class="p">,</span> <span class="n">error</span><span class="o">-></span><span class="n">message</span><span class="p">);</span> <span class="n">g_error_free</span> <span class="p">(</span><span class="n">error</span><span class="p">);</span> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span> <span class="n">g_warning</span> <span class="p">(</span><span class="s">"Failed to acquire %s"</span><span class="p">,</span> <span class="n">NAME_TO_CLAIM</span><span class="p">);</span> <span class="p">}</span> <span class="k">goto</span> <span class="n">out</span><span class="p">;</span> <span class="p">}</span> <span class="k">if</span> <span class="p">(</span><span class="n">result</span> <span class="o">!=</span> <span class="n">DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER</span><span class="p">)</span> <span class="p">{</span> <span class="k">if</span> <span class="p">(</span><span class="n">error</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">)</span> <span class="p">{</span> <span class="n">g_warning</span> <span class="p">(</span><span class="s">"Failed to acquire %s: %s"</span><span class="p">,</span> <span class="n">NAME_TO_CLAIM</span><span class="p">,</span> <span class="n">error</span><span class="o">-></span><span class="n">message</span><span class="p">);</span> <span class="n">g_error_free</span> <span class="p">(</span><span class="n">error</span><span class="p">);</span> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span> <span class="n">g_warning</span> <span class="p">(</span><span class="s">"Failed to acquire %s"</span><span class="p">,</span> <span class="n">NAME_TO_CLAIM</span><span class="p">);</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">dbus_g_proxy_add_signal</span> <span class="p">(</span><span class="n">system_bus_proxy</span><span class="p">,</span> <span class="s">"NameLost"</span><span class="p">,</span> <span class="n">G_TYPE_STRING</span><span class="p">,</span> <span class="n">G_TYPE_INVALID</span><span class="p">);</span> <span class="n">dbus_g_proxy_connect_signal</span> <span class="p">(</span><span class="n">system_bus_proxy</span><span class="p">,</span> <span class="s">"NameLost"</span><span class="p">,</span> <span class="n">G_CALLBACK</span> <span class="p">(</span><span class="n">on_name_lost</span><span class="p">),</span> <span class="nb">NULL</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span> <span class="cm">/* further setup ... */</span></pre></td> </tr> </tbody> </table> </div> <p> </p> <p> While you can do things this way with GDBus too, using <a class="link" href="GDBusProxy.html#g-dbus-proxy-call-sync" title="g_dbus_proxy_call_sync ()"><code class="function">g_dbus_proxy_call_sync()</code></a>, it is much nicer to use the high-level API for this: </p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22</pre></td> <td class="listing_code"><pre class="programlisting"><span class="k">static</span> <span class="kt">void</span> <span class="nf">on_name_acquired</span> <span class="p">(</span><span class="n">GDBusConnection</span> <span class="o">*</span><span class="n">connection</span><span class="p">,</span> <span class="k">const</span> <span class="n">gchar</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span> <span class="n">gpointer</span> <span class="n">user_data</span><span class="p">)</span> <span class="p">{</span> <span class="cm">/* further setup ... */</span> <span class="p">}</span> <span class="cm">/* ... */</span> <span class="n">owner_id</span> <span class="o">=</span> <span class="n">g_bus_own_name</span> <span class="p">(</span><span class="n">G_BUS_TYPE_SYSTEM</span><span class="p">,</span> <span class="n">NAME_TO_CLAIM</span><span class="p">,</span> <span class="n">G_BUS_NAME_OWNER_FLAGS_ALLOW_REPLACEMENT</span><span class="p">,</span> <span class="n">on_bus_acquired</span><span class="p">,</span> <span class="n">on_name_acquired</span><span class="p">,</span> <span class="n">on_name_lost</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span> <span class="n">g_main_loop_run</span> <span class="p">(</span><span class="n">loop</span><span class="p">);</span> <span class="n">g_bus_unown_name</span> <span class="p">(</span><span class="n">owner_id</span><span class="p">);</span></pre></td> </tr> </tbody> </table> </div> <p> Note that <a class="link" href="gio-Owning-Bus-Names.html#g-bus-own-name" title="g_bus_own_name ()"><code class="function">g_bus_own_name()</code></a> works asynchronously and requires you to enter your mainloop to await the <code class="function">on_name_aquired()</code> callback. Also note that in order to avoid race conditions (e.g. when your service is activated by a method call), you have to export your manager object <span class="emphasis"><em>before</em></span> acquiring the name. The <code class="function">on_bus_acquired()</code> callback is the right place to do such preparations. </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>