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| <h1 class="settitle">GDB's Obsolete Annotations</h1> |
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| <h2 class="chapter">1 What is an Annotation?</h2> |
| |
| <p><a name="index-annotations-1"></a> |
| To produce obsolete level two annotations, start <span class="sc">gdb</span> with the |
| <code>--annotate=2</code> option. |
| |
| <p>Annotations start with a newline character, two ‘<samp><span class="samp">control-z</span></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>Any output not beginning with a newline and two ‘<samp><span class="samp">control-z</span></samp>’ |
| characters denotes literal output from <span class="sc">gdb</span>. Currently there is |
| no need for <span class="sc">gdb</span> to output a newline followed by two |
| ‘<samp><span class="samp">control-z</span></samp>’ characters, but if there was such a need, the |
| annotations could be extended with an ‘<samp><span class="samp">escape</span></samp>’ annotation which |
| means those three characters as output. |
| |
| <p>A simple example of starting up <span class="sc">gdb</span> with annotations is: |
| |
| <pre class="smallexample"> $ gdb --annotate=2 |
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| ^Z^Zpre-prompt |
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| ^Z^Zprompt |
| quit |
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| ^Z^Zpost-prompt |
| $ |
| </pre> |
| <p>Here ‘<samp><span class="samp">quit</span></samp>’ is input to <span class="sc">gdb</span>; the rest is output from |
| <span class="sc">gdb</span>. The three lines beginning ‘<samp><span class="samp">^Z^Z</span></samp>’ (where ‘<samp><span class="samp">^Z</span></samp>’ |
| denotes a ‘<samp><span class="samp">control-z</span></samp>’ character) are annotations; the rest is |
| output from <span class="sc">gdb</span>. |
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