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### 28.3 Annotation for gdb Input

When gdb 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.

Different kinds of input each have a different input type. Each input type has three annotations: a `pre-` 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 `post-` annotation which denotes the end of any echo which may (or may not) be associated with the input. For example, the `prompt` input type features the following annotations:

         ^Z^Zpre-prompt
         ^Z^Zprompt
         ^Z^Zpost-prompt

The input types are

`prompt`
  When gdb is prompting for a command (the main gdb prompt).

`commands`
  When gdb prompts for a set of commands, like in the `commands` command. The annotations are repeated for each command which is input.

`overload-choice`
  When gdb wants the user to select between various overloaded functions.

`query`
  When gdb wants the user to confirm a potentially dangerous operation.

`prompt-for-continue`
  When gdb is asking the user to press return to continue. Note: Don't expect this to work well; instead use `set height 0` to disable prompting. This is because the counting of lines is buggy in the presence of annotations.