ceph/src/boost/boost/asio/detail/resolver_service.hpp

   1 //
   2 // detail/resolver_service.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
  12 #define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19
  20 #if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
  21
  22 #include <boost/asio/ip/basic_resolver_query.hpp>
  23 #include <boost/asio/ip/basic_resolver_results.hpp>
  24 #include <boost/asio/detail/concurrency_hint.hpp>
  25 #include <boost/asio/detail/memory.hpp>
  26 #include <boost/asio/detail/resolve_endpoint_op.hpp>
  27 #include <boost/asio/detail/resolve_query_op.hpp>
  28 #include <boost/asio/detail/resolver_service_base.hpp>
  29
  30 #include <boost/asio/detail/push_options.hpp>
  31
  32 namespace boost {
  33 namespace asio {
  34 namespace detail {
  35
  36 template <typename Protocol>
  37 class resolver_service :
  38   public service_base<resolver_service<Protocol> >,
  39   public resolver_service_base
  40 {
  41 public:
  42   // The implementation type of the resolver. A cancellation token is used to
  43   // indicate to the background thread that the operation has been cancelled.
  44   typedef socket_ops::shared_cancel_token_type implementation_type;
  45
  46   // The endpoint type.
  47   typedef typename Protocol::endpoint endpoint_type;
  48
  49   // The query type.
  50   typedef boost::asio::ip::basic_resolver_query<Protocol> query_type;
  51
  52   // The results type.
  53   typedef boost::asio::ip::basic_resolver_results<Protocol> results_type;
  54
  55   // Constructor.
  56   resolver_service(boost::asio::io_context& io_context)
  57     : service_base<resolver_service<Protocol> >(io_context),
  58       resolver_service_base(io_context)
  59   {
  60   }
  61
  62   // Destroy all user-defined handler objects owned by the service.
  63   void shutdown()
  64   {
  65     this->base_shutdown();
  66   }
  67
  68   // Perform any fork-related housekeeping.
  69   void notify_fork(boost::asio::io_context::fork_event fork_ev)
  70   {
  71     this->base_notify_fork(fork_ev);
  72   }
  73
  74   // Resolve a query to a list of entries.
  75   results_type resolve(implementation_type&, const query_type& query,
  76       boost::system::error_code& ec)
  77   {
  78     boost::asio::detail::addrinfo_type* address_info = 0;
  79
  80     socket_ops::getaddrinfo(query.host_name().c_str(),
  81         query.service_name().c_str(), query.hints(), &address_info, ec);
  82     auto_addrinfo auto_address_info(address_info);
  83
  84     return ec ? results_type() : results_type::create(
  85         address_info, query.host_name(), query.service_name());
  86   }
  87
  88   // Asynchronously resolve a query to a list of entries.
  89   template <typename Handler>
  90   void async_resolve(implementation_type& impl,
  91       const query_type& query, Handler& handler)
  92   {
  93     // Allocate and construct an operation to wrap the handler.
  94     typedef resolve_query_op<Protocol, Handler> op;
  95     typename op::ptr p = { boost::asio::detail::addressof(handler),
  96       op::ptr::allocate(handler), 0 };
  97     p.p = new (p.v) op(impl, query, io_context_impl_, handler);
  98
  99     BOOST_ASIO_HANDLER_CREATION((io_context_impl_.context(),
 100           *p.p, "resolver", &impl, 0, "async_resolve"));
 101
 102     start_resolve_op(p.p);
 103     p.v = p.p = 0;
 104   }
 105
 106   // Resolve an endpoint to a list of entries.
 107   results_type resolve(implementation_type&,
 108       const endpoint_type& endpoint, boost::system::error_code& ec)
 109   {
 110     char host_name[NI_MAXHOST];
 111     char service_name[NI_MAXSERV];
 112     socket_ops::sync_getnameinfo(endpoint.data(), endpoint.size(),
 113         host_name, NI_MAXHOST, service_name, NI_MAXSERV,
 114         endpoint.protocol().type(), ec);
 115
 116     return ec ? results_type() : results_type::create(
 117         endpoint, host_name, service_name);
 118   }
 119
 120   // Asynchronously resolve an endpoint to a list of entries.
 121   template <typename Handler>
 122   void async_resolve(implementation_type& impl,
 123       const endpoint_type& endpoint, Handler& handler)
 124   {
 125     // Allocate and construct an operation to wrap the handler.
 126     typedef resolve_endpoint_op<Protocol, Handler> op;
 127     typename op::ptr p = { boost::asio::detail::addressof(handler),
 128       op::ptr::allocate(handler), 0 };
 129     p.p = new (p.v) op(impl, endpoint, io_context_impl_, handler);
 130
 131     BOOST_ASIO_HANDLER_CREATION((io_context_impl_.context(),
 132           *p.p, "resolver", &impl, 0, "async_resolve"));
 133
 134     start_resolve_op(p.p);
 135     p.v = p.p = 0;
 136   }
 137 };
 138
 139 } // namespace detail
 140 } // namespace asio
 141 } // namespace boost
 142
 143 #include <boost/asio/detail/pop_options.hpp>
 144
 145 #endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
 146
 147 #endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP