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<a name="GDB_002fMI-Output-Syntax"></a>
<div class="header">
<p>
Previous: <a href="GDB_002fMI-Input-Syntax.html#GDB_002fMI-Input-Syntax" accesskey="p" rel="previous">GDB/MI Input Syntax</a>, Up: <a href="GDB_002fMI-Command-Syntax.html#GDB_002fMI-Command-Syntax" accesskey="u" rel="up">GDB/MI Command Syntax</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="GDB_002fMI-Output-Syntax-1"></a>
<h4 class="subsection">27.2.2 <small>GDB/MI</small> Output Syntax</h4>

<a name="index-output-syntax-of-GDB_002fMI"></a>
<a name="index-GDB_002fMI_002c-output-syntax"></a>
<p>The output from <small>GDB/MI</small> consists of zero or more out-of-band records
followed, optionally, by a single result record.  This result record
is for the most recent command.  The sequence of output records is
terminated by &lsquo;<samp>(gdb)</samp>&rsquo;.
</p>
<p>If an input command was prefixed with a <code><var>token</var></code> then the
corresponding output for that command will also be prefixed by that same
<var>token</var>.
</p>
<dl compact="compact">
<dt><code><var>output</var> &rarr;</code></dt>
<dd><p><code>( <var>out-of-band-record</var> )* [ <var>result-record</var> ] &quot;(gdb)&quot; <var>nl</var></code>
</p>
</dd>
<dt><code><var>result-record</var> &rarr;</code></dt>
<dd><p><code> [ <var>token</var> ] &quot;^&quot; <var>result-class</var> ( &quot;,&quot; <var>result</var> )* <var>nl</var></code>
</p>
</dd>
<dt><code><var>out-of-band-record</var> &rarr;</code></dt>
<dd><p><code><var>async-record</var> | <var>stream-record</var></code>
</p>
</dd>
<dt><code><var>async-record</var> &rarr;</code></dt>
<dd><p><code><var>exec-async-output</var> | <var>status-async-output</var> | <var>notify-async-output</var></code>
</p>
</dd>
<dt><code><var>exec-async-output</var> &rarr;</code></dt>
<dd><p><code>[ <var>token</var> ] &quot;*&quot; <var>async-output nl</var></code>
</p>
</dd>
<dt><code><var>status-async-output</var> &rarr;</code></dt>
<dd><p><code>[ <var>token</var> ] &quot;+&quot; <var>async-output nl</var></code>
</p>
</dd>
<dt><code><var>notify-async-output</var> &rarr;</code></dt>
<dd><p><code>[ <var>token</var> ] &quot;=&quot; <var>async-output nl</var></code>
</p>
</dd>
<dt><code><var>async-output</var> &rarr;</code></dt>
<dd><p><code><var>async-class</var> ( &quot;,&quot; <var>result</var> )*</code>
</p>
</dd>
<dt><code><var>result-class</var> &rarr;</code></dt>
<dd><p><code>&quot;done&quot; | &quot;running&quot; | &quot;connected&quot; | &quot;error&quot; | &quot;exit&quot;</code>
</p>
</dd>
<dt><code><var>async-class</var> &rarr;</code></dt>
<dd><p><code>&quot;stopped&quot; | <var>others</var></code> (where <var>others</var> will be added
depending on the needs&mdash;this is still in development).
</p>
</dd>
<dt><code><var>result</var> &rarr;</code></dt>
<dd><p><code> <var>variable</var> &quot;=&quot; <var>value</var></code>
</p>
</dd>
<dt><code><var>variable</var> &rarr;</code></dt>
<dd><p><code> <var>string</var> </code>
</p>
</dd>
<dt><code><var>value</var> &rarr;</code></dt>
<dd><p><code> <var>const</var> | <var>tuple</var> | <var>list</var> </code>
</p>
</dd>
<dt><code><var>const</var> &rarr;</code></dt>
<dd><p><code><var>c-string</var></code>
</p>
</dd>
<dt><code><var>tuple</var> &rarr;</code></dt>
<dd><p><code> &quot;{}&quot; | &quot;{&quot; <var>result</var> ( &quot;,&quot; <var>result</var> )* &quot;}&quot; </code>
</p>
</dd>
<dt><code><var>list</var> &rarr;</code></dt>
<dd><p><code> &quot;[]&quot; | &quot;[&quot; <var>value</var> ( &quot;,&quot; <var>value</var> )* &quot;]&quot; | &quot;[&quot;
<var>result</var> ( &quot;,&quot; <var>result</var> )* &quot;]&quot; </code>
</p>
</dd>
<dt><code><var>stream-record</var> &rarr;</code></dt>
<dd><p><code><var>console-stream-output</var> | <var>target-stream-output</var> | <var>log-stream-output</var></code>
</p>
</dd>
<dt><code><var>console-stream-output</var> &rarr;</code></dt>
<dd><p><code>&quot;~&quot; <var>c-string nl</var></code>
</p>
</dd>
<dt><code><var>target-stream-output</var> &rarr;</code></dt>
<dd><p><code>&quot;@&quot; <var>c-string nl</var></code>
</p>
</dd>
<dt><code><var>log-stream-output</var> &rarr;</code></dt>
<dd><p><code>&quot;&amp;&quot; <var>c-string nl</var></code>
</p>
</dd>
<dt><code><var>nl</var> &rarr;</code></dt>
<dd><p><code>CR | CR-LF</code>
</p>
</dd>
<dt><code><var>token</var> &rarr;</code></dt>
<dd><p><em>any sequence of digits</em>.
</p></dd>
</dl>

<p>Notes:
</p>
<ul>
<li> All output sequences end in a single line containing a period.

</li><li> The <code><var>token</var></code> is from the corresponding request.  Note that
for all async output, while the token is allowed by the grammar and
may be output by future versions of <small>GDB</small> for select async
output messages, it is generally omitted.  Frontends should treat
all async output as reporting general changes in the state of the
target and there should be no need to associate async output to any
prior command.

</li><li> <a name="index-status-output-in-GDB_002fMI"></a>
<var>status-async-output</var> contains on-going status information about the
progress of a slow operation.  It can be discarded.  All status output is
prefixed by &lsquo;<samp>+</samp>&rsquo;.

</li><li> <a name="index-async-output-in-GDB_002fMI"></a>
<var>exec-async-output</var> contains asynchronous state change on the target
(stopped, started, disappeared).  All async output is prefixed by
&lsquo;<samp>*</samp>&rsquo;.

</li><li> <a name="index-notify-output-in-GDB_002fMI"></a>
<var>notify-async-output</var> contains supplementary information that the
client should handle (e.g., a new breakpoint information).  All notify
output is prefixed by &lsquo;<samp>=</samp>&rsquo;.

</li><li> <a name="index-console-output-in-GDB_002fMI"></a>
<var>console-stream-output</var> is output that should be displayed as is in the
console.  It is the textual response to a CLI command.  All the console
output is prefixed by &lsquo;<samp>~</samp>&rsquo;.

</li><li> <a name="index-target-output-in-GDB_002fMI"></a>
<var>target-stream-output</var> is the output produced by the target program.
All the target output is prefixed by &lsquo;<samp>@</samp>&rsquo;.

</li><li> <a name="index-log-output-in-GDB_002fMI"></a>
<var>log-stream-output</var> is output text coming from <small>GDB</small>&rsquo;s internals, for
instance messages that should be displayed as part of an error log.  All
the log output is prefixed by &lsquo;<samp>&amp;</samp>&rsquo;.

</li><li> <a name="index-list-output-in-GDB_002fMI"></a>
New <small>GDB/MI</small> commands should only output <var>lists</var> containing
<var>values</var>.


</li></ul>

<p>See <a href="GDB_002fMI-Stream-Records.html#GDB_002fMI-Stream-Records"><small>GDB/MI</small> Stream Records</a>, for more
details about the various output records.
</p>
<hr>
<div class="header">
<p>
Previous: <a href="GDB_002fMI-Input-Syntax.html#GDB_002fMI-Input-Syntax" accesskey="p" rel="previous">GDB/MI Input Syntax</a>, Up: <a href="GDB_002fMI-Command-Syntax.html#GDB_002fMI-Command-Syntax" accesskey="u" rel="up">GDB/MI Command Syntax</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>
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