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diff --git a/gdb/common/gdb_signals.h b/gdb/common/gdb_signals.h
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+++ b/gdb/common/gdb_signals.h
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+/* Target signal translation functions for GDB.
+   Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+   2000, 2001, 2002, 2003, 2006, 2007, 2008, 2009
+   Free Software Foundation, Inc.
+   Contributed by Cygnus Support.
+
+   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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef COMMON_GDB_SIGNALS_H
+#define COMMON_GDB_SIGNALS_H
+
+#include "gdb/signals.h"
+
+/* Predicate to target_signal_to_host(). Return non-zero if the enum
+   targ_signal SIGNO has an equivalent ``host'' representation.  */
+/* FIXME: cagney/1999-11-22: The name below was chosen in preference
+   to the shorter target_signal_p() because it is far less ambigious.
+   In this context ``target_signal'' refers to GDB's internal
+   representation of the target's set of signals while ``host signal''
+   refers to the target operating system's signal.  Confused?  */
+extern int target_signal_to_host_p (enum target_signal signo);
+
+/* Convert between host signal numbers and enum target_signal's.
+   target_signal_to_host() returns 0 and prints a warning() on GDB's
+   console if SIGNO has no equivalent host representation.  */
+/* FIXME: cagney/1999-11-22: Here ``host'' is used incorrectly, it is
+   refering to the target operating system's signal numbering.
+   Similarly, ``enum target_signal'' is named incorrectly, ``enum
+   gdb_signal'' would probably be better as it is refering to GDB's
+   internal representation of a target operating system's signal.  */
+extern enum target_signal target_signal_from_host (int);
+extern int target_signal_to_host (enum target_signal);
+
+/* Return the string for a signal.  */
+extern const char *target_signal_to_string (enum target_signal);
+
+/* Return the name (SIGHUP, etc.) for a signal.  */
+extern const char *target_signal_to_name (enum target_signal);
+
+/* Given a name (SIGHUP, etc.), return its signal.  */
+enum target_signal target_signal_from_name (const char *);
+
+#endif /* COMMON_GDB_SIGNALS_H */