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diff --git a/utils/cmdline/exceptions.hpp b/utils/cmdline/exceptions.hpp
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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/cmdline/exceptions.hpp
+/// Exception types raised by the cmdline module.
+
+#if !defined(UTILS_CMDLINE_EXCEPTIONS_HPP)
+#define UTILS_CMDLINE_EXCEPTIONS_HPP
+
+#include <stdexcept>
+#include <string>
+
+namespace utils {
+namespace cmdline {
+
+
+/// Base exception for cmdline errors.
+class error : public std::runtime_error {
+public:
+    explicit error(const std::string&);
+    ~error(void) throw();
+};
+
+
+/// Generic error to describe problems caused by the user.
+class usage_error : public error {
+public:
+    explicit usage_error(const std::string&);
+    ~usage_error(void) throw();
+};
+
+
+/// Error denoting that no argument was provided to an option that required one.
+class missing_option_argument_error : public usage_error {
+    /// Name of the option for which no required argument was specified.
+    std::string _option;
+
+public:
+    explicit missing_option_argument_error(const std::string&);
+    ~missing_option_argument_error(void) throw();
+
+    const std::string& option(void) const;
+};
+
+
+/// Error denoting that the argument provided to an option is invalid.
+class option_argument_value_error : public usage_error {
+    /// Name of the option for which the argument was invalid.
+    std::string _option;
+
+    /// Raw value of the invalid user-provided argument.
+    std::string _argument;
+
+    /// Reason describing why the argument is invalid.
+    std::string _reason;
+
+public:
+    explicit option_argument_value_error(const std::string&, const std::string&,
+                                         const std::string&);
+    ~option_argument_value_error(void) throw();
+
+    const std::string& option(void) const;
+    const std::string& argument(void) const;
+};
+
+
+/// Error denoting that the user specified an unknown option.
+class unknown_option_error : public usage_error {
+    /// Name of the option that was not known.
+    std::string _option;
+
+public:
+    explicit unknown_option_error(const std::string&);
+    ~unknown_option_error(void) throw();
+
+    const std::string& option(void) const;
+};
+
+
+}  // namespace cmdline
+}  // namespace utils
+
+
+#endif  // !defined(UTILS_CMDLINE_EXCEPTIONS_HPP)