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<a name="GDB_002fMI-Simple-Examples"></a>
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<p>
Next: <a href="GDB_002fMI-Command-Description-Format.html#GDB_002fMI-Command-Description-Format" accesskey="n" rel="next">GDB/MI Command Description Format</a>, Previous: <a href="GDB_002fMI-Output-Records.html#GDB_002fMI-Output-Records" accesskey="p" rel="previous">GDB/MI Output Records</a>, Up: <a href="GDB_002fMI.html#GDB_002fMI" accesskey="u" rel="up">GDB/MI</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Simple-Examples-of-GDB_002fMI-Interaction"></a>
<h3 class="section">27.6 Simple Examples of <small>GDB/MI</small> Interaction</h3>
<a name="index-GDB_002fMI_002c-simple-examples"></a>

<p>This subsection presents several simple examples of interaction using
the <small>GDB/MI</small> interface.  In these examples, &lsquo;<samp>-&gt;</samp>&rsquo; means that the
following line is passed to <small>GDB/MI</small> as input, while &lsquo;<samp>&lt;-</samp>&rsquo; means
the output received from <small>GDB/MI</small>.
</p>
<p>Note the line breaks shown in the examples are here only for
readability, they don&rsquo;t appear in the real output.
</p>
<a name="Setting-a-Breakpoint"></a>
<h4 class="subheading">Setting a Breakpoint</h4>

<p>Setting a breakpoint generates synchronous output which contains detailed
information of the breakpoint.
</p>
<div class="smallexample">
<pre class="smallexample">-&gt; -break-insert main
&lt;- ^done,bkpt={number=&quot;1&quot;,type=&quot;breakpoint&quot;,disp=&quot;keep&quot;,
    enabled=&quot;y&quot;,addr=&quot;0x08048564&quot;,func=&quot;main&quot;,file=&quot;myprog.c&quot;,
    fullname=&quot;/home/nickrob/myprog.c&quot;,line=&quot;68&quot;,thread-groups=[&quot;i1&quot;],
    times=&quot;0&quot;}
&lt;- (gdb)
</pre></div>

<a name="Program-Execution"></a>
<h4 class="subheading">Program Execution</h4>

<p>Program execution generates asynchronous records and MI gives the
reason that execution stopped.
</p>
<div class="smallexample">
<pre class="smallexample">-&gt; -exec-run
&lt;- ^running
&lt;- (gdb)
&lt;- *stopped,reason=&quot;breakpoint-hit&quot;,disp=&quot;keep&quot;,bkptno=&quot;1&quot;,thread-id=&quot;0&quot;,
   frame={addr=&quot;0x08048564&quot;,func=&quot;main&quot;,
   args=[{name=&quot;argc&quot;,value=&quot;1&quot;},{name=&quot;argv&quot;,value=&quot;0xbfc4d4d4&quot;}],
   file=&quot;myprog.c&quot;,fullname=&quot;/home/nickrob/myprog.c&quot;,line=&quot;68&quot;,
   arch=&quot;i386:x86_64&quot;}
&lt;- (gdb)
-&gt; -exec-continue
&lt;- ^running
&lt;- (gdb)
&lt;- *stopped,reason=&quot;exited-normally&quot;
&lt;- (gdb)
</pre></div>

<a name="Quitting-GDB-2"></a>
<h4 class="subheading">Quitting <small>GDB</small></h4>

<p>Quitting <small>GDB</small> just prints the result class &lsquo;<samp>^exit</samp>&rsquo;.
</p>
<div class="smallexample">
<pre class="smallexample">-&gt; (gdb)
&lt;- -gdb-exit
&lt;- ^exit
</pre></div>

<p>Please note that &lsquo;<samp>^exit</samp>&rsquo; is printed immediately, but it might
take some time for <small>GDB</small> to actually exit.  During that time, <small>GDB</small>
performs necessary cleanups, including killing programs being debugged
or disconnecting from debug hardware, so the frontend should wait till
<small>GDB</small> exits and should only forcibly kill <small>GDB</small> if it
fails to exit in reasonable time.
</p>
<a name="A-Bad-Command"></a>
<h4 class="subheading">A Bad Command</h4>

<p>Here&rsquo;s what happens if you pass a non-existent command:
</p>
<div class="smallexample">
<pre class="smallexample">-&gt; -rubbish
&lt;- ^error,msg=&quot;Undefined MI command: rubbish&quot;
&lt;- (gdb)
</pre></div>


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