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diff --git a/gdb/event-top.h b/gdb/event-top.h
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+/* Definitions used by GDB event-top.c.
+   Copyright 1999 Free Software Foundation, Inc.
+   Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* Stack for prompts. Each prompt is composed as a prefix, a prompt
+   and a suffix. The prompt to be displayed at any given time is the
+   one on top of the stack.  A stack is necessary because of cases in
+   which the execution of a gdb command requires further input from
+   the user, like for instance 'commands' for breakpoints and
+   'actions' for tracepoints. In these cases, the prompt is '>' and
+   gdb should process input using the asynchronous readline interface
+   and the event loop.  In order to achieve this, we need to save
+   somewhere the state of GDB, i.e. that it is processing user input
+   as part of a command and not as part of the top level command loop.
+   The prompt stack represents part of the saved state. Another part
+   would be the function that readline would invoke after a whole line
+   of input has ben entered. This second piece would be something
+   like, for instance, where to return within the code for the actions
+   commands after a line has been read.  This latter portion has not
+   beeen implemented yet.  The need for a 3-part prompt arises from
+   the annotation level. When this is set to 2, the prompt is actually
+   composed of a prefix, the prompt itself and a suffix. */
+
+/* At any particular time there will be always at least one prompt on
+   the stack, the one being currently displayed by gdb. If gdb is
+   using annotation level equal 2, there will be 2 prompts on the
+   stack: the usual one, w/o prefix and suffix (at top - 1), and the
+   'composite' one with prefix and suffix added (at top). At this
+   time, this is the only use of the prompt stack. Resetting annotate
+   to 0 or 1, pops the top of the stack, resetting its size to one
+   element. The MAXPROMPTS limit is safe, for now. Once other cases
+   are dealt with (like the different prompts used for 'commands' or
+   'actions') this array implementation of the prompt stack may have
+   to change. */
+
+#define MAXPROMPTS 10
+struct prompts
+  {
+    struct
+      {
+	char *prefix;
+	char *prompt;
+	char *suffix;
+      }
+    prompt_stack[MAXPROMPTS];
+    int top;
+  };
+
+#define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt
+#define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix
+#define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix
+
+/* Exported functions from event-top.c. 
+   FIXME: these should really go into top.h. */
+
+extern void display_gdb_prompt (char *new_prompt);
+extern void async_init_signals (void);
+extern void set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c);
+extern void set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c);
+extern void set_async_prompt (char *args, int from_tty, struct cmd_list_element *c);
+
+/* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT.  */
+#ifndef STOP_SIGNAL
+#ifdef SIGTSTP
+#define STOP_SIGNAL SIGTSTP
+extern void handle_stop_sig (int sig);
+#endif
+#endif
+extern void handle_sigint (int sig);
+extern void pop_prompt (void);
+extern void push_prompt (char *prefix, char *prompt, char *suffix);
+extern void gdb_readline2 (gdb_client_data client_data);
+extern void mark_async_signal_handler_wrapper (PTR token);
+extern void async_request_quit (gdb_client_data arg);
+extern void stdin_event_handler (int error, int fd, gdb_client_data client_data);
+
+/* Exported variables from event-top.c.
+   FIXME: these should really go into top.h. */
+
+extern int async_command_editing_p;
+extern int exec_done_display_p;
+extern char *async_annotation_suffix;
+extern char *new_async_prompt;
+extern struct prompts the_prompts;
+extern void (*call_readline) (gdb_client_data);
+extern void (*input_handler) (char *);
+extern int input_fd;