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| <title>GDB’s Obsolete Annotations: Annotations Overview</title> |
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| <a name="Annotations-Overview"></a> |
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| Next: <a href="Limitations.html#Limitations" accesskey="n" rel="next">Limitations</a>, Previous: <a href="index.html#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p> |
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| <a name="What-is-an-Annotation_003f"></a> |
| <h2 class="chapter">1 What is an Annotation?</h2> |
| <a name="index-annotations"></a> |
| |
| <p>To produce obsolete level two annotations, start <small>GDB</small> with the |
| <code>--annotate=2</code> option. |
| </p> |
| <p>Annotations start with a newline character, two ‘<samp>control-z</samp>’ |
| characters, and the name of the annotation. If there is no additional |
| information associated with this annotation, the name of the annotation |
| is followed immediately by a newline. If there is additional |
| information, the name of the annotation is followed by a space, the |
| additional information, and a newline. The additional information |
| cannot contain newline characters. |
| </p> |
| <p>Any output not beginning with a newline and two ‘<samp>control-z</samp>’ |
| characters denotes literal output from <small>GDB</small>. Currently there is |
| no need for <small>GDB</small> to output a newline followed by two |
| ‘<samp>control-z</samp>’ characters, but if there was such a need, the |
| annotations could be extended with an ‘<samp>escape</samp>’ annotation which |
| means those three characters as output. |
| </p> |
| <p>A simple example of starting up <small>GDB</small> with annotations is: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">$ gdb --annotate=2 |
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| </pre></div> |
| |
| <p>Here ‘<samp>quit</samp>’ is input to <small>GDB</small>; the rest is output from |
| <small>GDB</small>. The three lines beginning ‘<samp>^Z^Z</samp>’ (where ‘<samp>^Z</samp>’ |
| denotes a ‘<samp>control-z</samp>’ character) are annotations; the rest is |
| output from <small>GDB</small>. |
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