GNU Emacs Manual - GUD Customization

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### GUD Customization

On startup, GUD runs one of the following hooks: `gdb-mode-hook`, if you are using GDB; `dbx-mode-hook`, if you are using DBX; `sdb-mode-hook`, if you are using SDB; `xdb-mode-hook`, if you are using XDB; `perldb-mode-hook`, for Perl debugging mode; `jdb-mode-hook`, for PDB; `jdb-mode-hook`, for JDB. You can use these hooks to define custom key bindings for the debugger interaction buffer. See section Hooks.

Here is a convenient way to define a command that sends a particular command string to the debugger, and set up a key binding for it in the debugger interaction buffer:

    (gud-def function cmdstring binding docstring)

This defines a command named function which sends cmdstring to the debugger process, and gives it the documentation string docstring. You can use the command thus defined in any buffer. If binding is non-`nil`, `gud-def` also binds the command to `C-c binding` in the GUD buffer's mode and to `C-x C-a binding` generally.

The command string cmdstring may contain certain ``%'`-sequences that stand for data to be filled in at the time function is called:

``%f'`
  The name of the current source file. If the current buffer is the GUD buffer, then the "current source file" is the file that the program stopped in.
``%l'`
  The number of the current source line. If the current buffer is the GUD buffer, then the "current source line" is the line that the program stopped in.
``%e'`
  The text of the C lvalue or function-call expression at or adjacent to point.
``%a'`
  The text of the hexadecimal address at or adjacent to point.
``%p'`
  The numeric argument of the called function, as a decimal number. If the command is used without a numeric argument, ``%p'` stands for the empty string. If you don't use ``%p'` in the command string, the command you define ignores any numeric argument.

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