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diff --git a/unit/atf-src/tools/signals.hpp b/unit/atf-src/tools/signals.hpp
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+//
+// Automated Testing Framework (atf)
+//
+// Copyright (c) 2007 The NetBSD Foundation, Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
+// CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+// IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+// IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+
+#if !defined(TOOLS_SIGNALS_HPP)
+#define TOOLS_SIGNALS_HPP
+
+extern "C" {
+#include <signal.h>
+}
+
+namespace tools {
+namespace signals {
+
+extern const int last_signo;
+typedef void (*handler)(const int);
+
+class signal_programmer;
+
+// ------------------------------------------------------------------------
+// The "signal_holder" class.
+// ------------------------------------------------------------------------
+
+//
+// A RAII model to hold a signal while the object is alive.
+//
+class signal_holder {
+    const int m_signo;
+    signal_programmer* m_sp;
+
+public:
+    signal_holder(const int);
+    ~signal_holder(void);
+
+    void process(void);
+};
+
+// ------------------------------------------------------------------------
+// The "signal_programmer" class.
+// ------------------------------------------------------------------------
+
+//
+// A RAII model to program a signal while the object is alive.
+//
+class signal_programmer {
+    const int m_signo;
+    const handler m_handler;
+    bool m_programmed;
+    struct sigaction m_oldsa;
+
+public:
+    signal_programmer(const int, const handler);
+    ~signal_programmer(void);
+
+    void unprogram(void);
+};
+
+// ------------------------------------------------------------------------
+// Free functions.
+// ------------------------------------------------------------------------
+
+void reset(const int);
+
+} // namespace signals
+} // namespace tools
+
+#endif // !defined(TOOLS_SIGNALS_HPP)