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diff --git a/lib/asio/detail/signal_set_service.hpp b/lib/asio/detail/signal_set_service.hpp
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+++ b/lib/asio/detail/signal_set_service.hpp
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+//
+// detail/signal_set_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_SIGNAL_SET_SERVICE_HPP
+#define ASIO_DETAIL_SIGNAL_SET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#include <cstddef>
+#include <signal.h>
+#include "asio/error.hpp"
+#include "asio/io_context.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/op_queue.hpp"
+#include "asio/detail/signal_handler.hpp"
+#include "asio/detail/signal_op.hpp"
+#include "asio/detail/socket_types.hpp"
+
+#if !defined(ASIO_WINDOWS) && !defined(__CYGWIN__)
+# include "asio/detail/reactor.hpp"
+#endif // !defined(ASIO_WINDOWS) && !defined(__CYGWIN__)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+#if defined(NSIG) && (NSIG > 0)
+enum { max_signal_number = NSIG };
+#else
+enum { max_signal_number = 128 };
+#endif
+
+extern ASIO_DECL struct signal_state* get_signal_state();
+
+extern "C" ASIO_DECL void asio_signal_handler(int signal_number);
+
+class signal_set_service :
+  public service_base<signal_set_service>
+{
+public:
+  // Type used for tracking an individual signal registration.
+  class registration
+  {
+  public:
+    // Default constructor.
+    registration()
+      : signal_number_(0),
+        queue_(0),
+        undelivered_(0),
+        next_in_table_(0),
+        prev_in_table_(0),
+        next_in_set_(0)
+    {
+    }
+
+  private:
+    // Only this service will have access to the internal values.
+    friend class signal_set_service;
+
+    // The signal number that is registered.
+    int signal_number_;
+
+    // The waiting signal handlers.
+    op_queue<signal_op>* queue_;
+
+    // The number of undelivered signals.
+    std::size_t undelivered_;
+
+    // Pointers to adjacent registrations in the registrations_ table.
+    registration* next_in_table_;
+    registration* prev_in_table_;
+
+    // Link to next registration in the signal set.
+    registration* next_in_set_;
+  };
+
+  // The implementation type of the signal_set.
+  class implementation_type
+  {
+  public:
+    // Default constructor.
+    implementation_type()
+      : signals_(0)
+    {
+    }
+
+  private:
+    // Only this service will have access to the internal values.
+    friend class signal_set_service;
+
+    // The pending signal handlers.
+    op_queue<signal_op> queue_;
+
+    // Linked list of registered signals.
+    registration* signals_;
+  };
+
+  // Constructor.
+  ASIO_DECL signal_set_service(asio::io_context& io_context);
+
+  // Destructor.
+  ASIO_DECL ~signal_set_service();
+
+  // Destroy all user-defined handler objects owned by the service.
+  ASIO_DECL void shutdown();
+
+  // Perform fork-related housekeeping.
+  ASIO_DECL void notify_fork(
+      asio::io_context::fork_event fork_ev);
+
+  // Construct a new signal_set implementation.
+  ASIO_DECL void construct(implementation_type& impl);
+
+  // Destroy a signal_set implementation.
+  ASIO_DECL void destroy(implementation_type& impl);
+
+  // Add a signal to a signal_set.
+  ASIO_DECL asio::error_code add(implementation_type& impl,
+      int signal_number, asio::error_code& ec);
+
+  // Remove a signal to a signal_set.
+  ASIO_DECL asio::error_code remove(implementation_type& impl,
+      int signal_number, asio::error_code& ec);
+
+  // Remove all signals from a signal_set.
+  ASIO_DECL asio::error_code clear(implementation_type& impl,
+      asio::error_code& ec);
+
+  // Cancel all operations associated with the signal set.
+  ASIO_DECL asio::error_code cancel(implementation_type& impl,
+      asio::error_code& ec);
+
+  // Start an asynchronous operation to wait for a signal to be delivered.
+  template <typename Handler>
+  void async_wait(implementation_type& impl, Handler& handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef signal_handler<Handler> op;
+    typename op::ptr p = { asio::detail::addressof(handler),
+      op::ptr::allocate(handler), 0 };
+    p.p = new (p.v) op(handler);
+
+    ASIO_HANDLER_CREATION((io_context_.context(),
+          *p.p, "signal_set", &impl, 0, "async_wait"));
+
+    start_wait_op(impl, p.p);
+    p.v = p.p = 0;
+  }
+
+  // Deliver notification that a particular signal occurred.
+  ASIO_DECL static void deliver_signal(int signal_number);
+
+private:
+  // Helper function to add a service to the global signal state.
+  ASIO_DECL static void add_service(signal_set_service* service);
+
+  // Helper function to remove a service from the global signal state.
+  ASIO_DECL static void remove_service(signal_set_service* service);
+
+  // Helper function to create the pipe descriptors.
+  ASIO_DECL static void open_descriptors();
+
+  // Helper function to close the pipe descriptors.
+  ASIO_DECL static void close_descriptors();
+
+  // Helper function to start a wait operation.
+  ASIO_DECL void start_wait_op(implementation_type& impl, signal_op* op);
+
+  // The io_context instance used for dispatching handlers.
+  io_context_impl& io_context_;
+
+#if !defined(ASIO_WINDOWS) \
+  && !defined(ASIO_WINDOWS_RUNTIME) \
+  && !defined(__CYGWIN__)
+  // The type used for registering for pipe reactor notifications.
+  class pipe_read_op;
+
+  // The reactor used for waiting for pipe readiness.
+  reactor& reactor_;
+
+  // The per-descriptor reactor data used for the pipe.
+  reactor::per_descriptor_data reactor_data_;
+#endif // !defined(ASIO_WINDOWS)
+       //   && !defined(ASIO_WINDOWS_RUNTIME)
+       //   && !defined(__CYGWIN__)
+
+  // A mapping from signal number to the registered signal sets.
+  registration* registrations_[max_signal_number];
+
+  // Pointers to adjacent services in linked list.
+  signal_set_service* next_;
+  signal_set_service* prev_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/signal_set_service.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_DETAIL_SIGNAL_SET_SERVICE_HPP