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diff --git a/src/lib/asiolink/io_service_signal.h b/src/lib/asiolink/io_service_signal.h
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+++ b/src/lib/asiolink/io_service_signal.h
@@ -0,0 +1,60 @@
+// Copyright (C) 2020-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef IO_SERVICE_SIGNAL_H
+#define IO_SERVICE_SIGNAL_H
+
+#include <asiolink/io_service.h>
+
+#include <boost/shared_ptr.hpp>
+
+namespace isc {
+namespace asiolink {
+
+/// @brief Defines a handler function for an IOSignal.
+typedef std::function<void(int signum)> IOSignalHandler;
+
+class IOSignalSetImpl;
+
+/// @brief Implements an asynchronous "signal" for IOService driven processing
+///
+/// This class allows a OS signal such as SIGHUP to propagated to an IOService
+/// as a ready event with a callback using boost ASIO.
+class IOSignalSet {
+public:
+    /// @brief Constructor.
+    ///
+    /// @param io_service IOService to which to send the signal.
+    /// @param handler Handler to call when a signal is received.
+    IOSignalSet(asiolink::IOServicePtr io_service, IOSignalHandler handler);
+
+    /// @brief Destructor.
+    ~IOSignalSet() = default;
+
+    /// @brief Add a signal to the list of signals to handle.
+    ///
+    /// @param signum Signal number.
+    /// @throw Unexpected on error.
+    void add(int signum);
+
+    /// @brief Remove a signal from the list of signals to handle.
+    ///
+    /// @param signum Signal number.
+    /// @throw Unexpected on error.
+    void remove(int signum);
+
+private:
+    /// @brief Pointer to the implementation.
+    boost::shared_ptr<IOSignalSetImpl> impl_;
+};
+
+/// @brief Defines a pointer to an IOSignalSet.
+typedef boost::shared_ptr<IOSignalSet> IOSignalSetPtr;
+
+} // namespace asiolink
+} // namespace isc
+
+#endif // IO_SERVICE_SIGNAL_H