aboutsummaryrefslogtreecommitdiffstats
path: root/lib/asio/detail/signal_set_service.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/asio/detail/signal_set_service.hpp')
-rw-r--r--lib/asio/detail/signal_set_service.hpp217
1 files changed, 217 insertions, 0 deletions
diff --git a/lib/asio/detail/signal_set_service.hpp b/lib/asio/detail/signal_set_service.hpp
new file mode 100644
index 0000000..a18ab70
--- /dev/null
+++ b/lib/asio/detail/signal_set_service.hpp
@@ -0,0 +1,217 @@
+//
+// 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