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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.
+
+/// \file utils/signals/exceptions.hpp
+/// Exception types raised by the signals module.
+
+#if !defined(UTILS_SIGNALS_EXCEPTIONS_HPP)
+#define UTILS_SIGNALS_EXCEPTIONS_HPP
+
+#include <stdexcept>
+
+namespace utils {
+namespace signals {
+
+
+/// Base exceptions for signals errors.
+class error : public std::runtime_error {
+public:
+    explicit error(const std::string&);
+    ~error(void) throw();
+};
+
+
+/// Denotes the reception of a signal to controlledly terminate execution.
+class interrupted_error : public error {
+    /// Signal that caused the interrupt.
+    int _signo;
+
+public:
+    explicit interrupted_error(const int signo_);
+    ~interrupted_error(void) throw();
+
+    int signo(void) const;
+};
+
+
+/// Exceptions for errno-based errors.
+///
+/// TODO(jmmv): This code is duplicated in, at least, utils::fs.  Figure
+/// out a way to reuse this exception while maintaining the correct inheritance
+/// (i.e. be able to keep it as a child of signals::error).
+class system_error : public error {
+    /// Error number describing this libc error condition.
+    int _original_errno;
+
+public:
+    explicit system_error(const std::string&, const int);
+    ~system_error(void) throw();
+
+    int original_errno(void) const throw();
+};
+
+
+}  // namespace signals
+}  // namespace utils
+
+
+#endif  // !defined(UTILS_SIGNALS_EXCEPTIONS_HPP)