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<title>Prompting (Debugging with GDB)</title>

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<a name="Prompting"></a>
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<a name="Annotation-for-GDB-Input"></a>
<h3 class="section">28.3 Annotation for <small>GDB</small> Input</h3>

<a name="index-annotations-for-prompts"></a>
<p>When <small>GDB</small> prompts for input, it annotates this fact so it is possible
to know when to send output, when the output from a given command is
over, etc.
</p>
<p>Different kinds of input each have a different <em>input type</em>.  Each
input type has three annotations: a <code>pre-</code> annotation, which
denotes the beginning of any prompt which is being output, a plain
annotation, which denotes the end of the prompt, and then a <code>post-</code>
annotation which denotes the end of any echo which may (or may not) be
associated with the input.  For example, the <code>prompt</code> input type
features the following annotations:
</p>
<div class="smallexample">
<pre class="smallexample">^Z^Zpre-prompt
^Z^Zprompt
^Z^Zpost-prompt
</pre></div>

<p>The input types are
</p>
<dl compact="compact">
<dd><a name="index-pre_002dprompt-annotation"></a>
<a name="index-prompt-annotation"></a>
<a name="index-post_002dprompt-annotation"></a>
</dd>
<dt><code>prompt</code></dt>
<dd><p>When <small>GDB</small> is prompting for a command (the main <small>GDB</small> prompt).
</p>
<a name="index-pre_002dcommands-annotation"></a>
<a name="index-commands-annotation"></a>
<a name="index-post_002dcommands-annotation"></a>
</dd>
<dt><code>commands</code></dt>
<dd><p>When <small>GDB</small> prompts for a set of commands, like in the <code>commands</code>
command.  The annotations are repeated for each command which is input.
</p>
<a name="index-pre_002doverload_002dchoice-annotation"></a>
<a name="index-overload_002dchoice-annotation"></a>
<a name="index-post_002doverload_002dchoice-annotation"></a>
</dd>
<dt><code>overload-choice</code></dt>
<dd><p>When <small>GDB</small> wants the user to select between various overloaded functions.
</p>
<a name="index-pre_002dquery-annotation"></a>
<a name="index-query-annotation"></a>
<a name="index-post_002dquery-annotation"></a>
</dd>
<dt><code>query</code></dt>
<dd><p>When <small>GDB</small> wants the user to confirm a potentially dangerous operation.
</p>
<a name="index-pre_002dprompt_002dfor_002dcontinue-annotation"></a>
<a name="index-prompt_002dfor_002dcontinue-annotation"></a>
<a name="index-post_002dprompt_002dfor_002dcontinue-annotation"></a>
</dd>
<dt><code>prompt-for-continue</code></dt>
<dd><p>When <small>GDB</small> is asking the user to press return to continue.  Note: Don&rsquo;t
expect this to work well; instead use <code>set height 0</code> to disable
prompting.  This is because the counting of lines is buggy in the
presence of annotations.
</p></dd>
</dl>

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