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diff --git a/utils/signals/exceptions.cpp b/utils/signals/exceptions.cpp
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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * 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.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+// OWNER 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.
+
+#include "utils/signals/exceptions.hpp"
+
+#include <cstring>
+
+#include "utils/format/macros.hpp"
+
+namespace signals = utils::signals;
+
+
+/// Constructs a new error with a plain-text message.
+///
+/// \param message The plain-text error message.
+signals::error::error(const std::string& message) :
+    std::runtime_error(message)
+{
+}
+
+
+/// Destructor for the error.
+signals::error::~error(void) throw()
+{
+}
+
+
+/// Constructs a new interrupted error.
+///
+/// \param signo_ The signal that caused the interrupt.
+signals::interrupted_error::interrupted_error(const int signo_) :
+    error(F("Interrupted by signal %s") % signo_),
+    _signo(signo_)
+{
+}
+
+
+/// Destructor for the error.
+signals::interrupted_error::~interrupted_error(void) throw()
+{
+}
+
+
+/// Queries the signal number of the interruption.
+///
+/// \return A signal number.
+int
+signals::interrupted_error::signo(void) const
+{
+    return _signo;
+}
+
+
+/// Constructs a new error based on an errno code.
+///
+/// \param message_ The message describing what caused the error.
+/// \param errno_ The error code.
+signals::system_error::system_error(const std::string& message_,
+                                    const int errno_) :
+    error(F("%s: %s") % message_ % strerror(errno_)),
+    _original_errno(errno_)
+{
+}
+
+
+/// Destructor for the error.
+signals::system_error::~system_error(void) throw()
+{
+}
+
+
+/// \return The original errno value.
+int
+signals::system_error::original_errno(void) const throw()
+{
+    return _original_errno;
+}