N if it is not already bound in MAP.  Returns
     non-zero in the case of an invalid KEY or if KEY is already bound.

 -- Function: int rl_unbind_key (int key)
     Bind KEY to the null function in the currently active keymap.
     Returns non-zero in case of error.

 -- Function: int rl_unbind_key_in_map (int key, Keymap map)
     Bind KEY to the null function in MAP.  Returns non-zero in case of
     error.

 -- Function: int rl_unbind_function_in_map (rl_command_func_t
          *function, Keymap map)
     Unbind all keys that execute FUNCTION in MAP.

 -- Function: int rl_unbind_command_in_map (const char *command, Keymap
          map)
     Unbind all keys that are bound to COMMAND in MAP.

 -- Function: int rl_bind_keyseq (const char *keyseq, rl_command_func_t
          *function)
     Bind the key sequence represented by the string KEYSEQ to the
     function FUNCTION, beginning in the current keymap.  This makes new
     keymaps as necessary.  The return value is non-zero if KEYSEQ is
     invalid.

 -- Function: int rl_bind_keyseq_in_map (const char *keyseq,
          rl_command_func_t *function, Keymap map)
     Bind the key sequence represented by the string KEYSEQ to the
     function FUNCTION.  This makes new keymaps as necessary.  Initial
     bindings are performed in MAP.  The return value is non-zero if
     KEYSEQ is invalid.

 -- Function: int rl_set_key (const char *keyseq, rl_command_func_t
          *function, Keymap map)
     Equivalent to 'rl_bind_keyseq_in_map'.

 -- Function: int rl_bind_keyseq_if_unbound (const char *keyseq,
          rl_command_func_t *function)
     Binds KEYSEQ to FUNCTION if it is not already bound in the
     currently active keymap.  Returns non-zero in the case of an
     invalid KEYSEQ or if KEYSEQ is already bound.

 -- Function: int rl_bind_keyseq_if_unbound_in_map (const char *keyseq,
          rl_command_func_t *function, Keymap map)
     Binds KEYSEQ to FUNCTION if it is not already bound in MAP.
     Returns non-zero in the case of an invalid KEYSEQ or if KEYSEQ is
     already bound.

 -- Function: int rl_generic_bind (int type, const char *keyseq, char
          *data, Keymap map)
     Bind the key sequence represented by the string KEYSEQ to the
     arbitrary pointer DATA.  TYPE says what kind of data is pointed to
     by DATA; this can be a function ('ISFUNC'), a macro ('ISMACR'), or
     a keymap ('ISKMAP').  This makes new keymaps as necessary.  The
     initial keymap in which to do bindings is MAP.

 -- Function: int rl_parse_and_bind (char *line)
     Parse LINE as if it had been read from the 'inputrc' file and
     perform any key bindings and variable assignments found (*note
     Readline Init File::).

 -- Function: int rl_read_init_file (const char *filename)
     Read keybindings and variable assignments from FILENAME (*note
     Readline Init File::).