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+/**
+ * Copyright (c) 2015, Suresh Sundriyal
+ *
+ * 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 the copyright holder 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 REGENTS 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 REGENTS 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.
+ */
+
+#ifndef timer_hh
+#define timer_hh
+
+#include <exception>
+
+#include <errno.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+// Linux and BSD seem to name the function pointer to signal handler
+// differently. Linux names it 'sighandler_t' and BSD names it 'sig_t'. Instead
+// of depending on configure scripts to find out the type name, typedef it right
+// here.
+typedef void (*sighandler_t_)(int);
+
+namespace timer {
+class error : public std::exception {
+public:
+    error(int err);
+    int e_err;
+};
+
+class interrupt_timer {
+public:
+    interrupt_timer(struct timeval, sighandler_t_);
+    int arm_timer();
+    void disarm_timer();
+    bool is_armed();
+    ~interrupt_timer();
+
+private:
+    sighandler_t_ new_handler;
+    struct sigaction old_handler;
+    struct itimerval new_val, old_val;
+    bool armed;
+};
+}  // namespace timer
+#endif