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+//
+// detail/resolve_endpoint_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2024 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_RESOLVER_ENDPOINT_OP_HPP
+#define ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_work.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/resolve_op.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/error.hpp"
+#include "asio/ip/basic_resolver_results.hpp"
+
+#if defined(ASIO_HAS_IOCP)
+# include "asio/detail/win_iocp_io_context.hpp"
+#else // defined(ASIO_HAS_IOCP)
+# include "asio/detail/scheduler.hpp"
+#endif // defined(ASIO_HAS_IOCP)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Protocol, typename Handler, typename IoExecutor>
+class resolve_endpoint_op : public resolve_op
+{
+public:
+ ASIO_DEFINE_HANDLER_PTR(resolve_endpoint_op);
+
+ typedef typename Protocol::endpoint endpoint_type;
+ typedef asio::ip::basic_resolver_results<Protocol> results_type;
+
+#if defined(ASIO_HAS_IOCP)
+ typedef class win_iocp_io_context scheduler_impl;
+#else
+ typedef class scheduler scheduler_impl;
+#endif
+
+ resolve_endpoint_op(socket_ops::weak_cancel_token_type cancel_token,
+ const endpoint_type& endpoint, scheduler_impl& sched,
+ Handler& handler, const IoExecutor& io_ex)
+ : resolve_op(&resolve_endpoint_op::do_complete),
+ cancel_token_(cancel_token),
+ endpoint_(endpoint),
+ scheduler_(sched),
+ handler_(static_cast<Handler&&>(handler)),
+ work_(handler_, io_ex)
+ {
+ }
+
+ static void do_complete(void* owner, operation* base,
+ const asio::error_code& /*ec*/,
+ std::size_t /*bytes_transferred*/)
+ {
+ // Take ownership of the operation object.
+ ASIO_ASSUME(base != 0);
+ resolve_endpoint_op* o(static_cast<resolve_endpoint_op*>(base));
+ ptr p = { asio::detail::addressof(o->handler_), o, o };
+
+ if (owner && owner != &o->scheduler_)
+ {
+ // The operation is being run on the worker io_context. Time to perform
+ // the resolver operation.
+
+ // Perform the blocking endpoint resolution operation.
+ char host_name[NI_MAXHOST] = "";
+ char service_name[NI_MAXSERV] = "";
+ socket_ops::background_getnameinfo(o->cancel_token_, o->endpoint_.data(),
+ o->endpoint_.size(), host_name, NI_MAXHOST, service_name, NI_MAXSERV,
+ o->endpoint_.protocol().type(), o->ec_);
+ o->results_ = results_type::create(o->endpoint_, host_name, service_name);
+
+ // Pass operation back to main io_context for completion.
+ o->scheduler_.post_deferred_completion(o);
+ p.v = p.p = 0;
+ }
+ else
+ {
+ // The operation has been returned to the main io_context. The completion
+ // handler is ready to be delivered.
+
+ ASIO_HANDLER_COMPLETION((*o));
+
+ // Take ownership of the operation's outstanding work.
+ handler_work<Handler, IoExecutor> w(
+ static_cast<handler_work<Handler, IoExecutor>&&>(
+ o->work_));
+
+ // Make a copy of the handler so that the memory can be deallocated
+ // before the upcall is made. Even if we're not about to make an upcall,
+ // a sub-object of the handler may be the true owner of the memory
+ // associated with the handler. Consequently, a local copy of the handler
+ // is required to ensure that any owning sub-object remains valid until
+ // after we have deallocated the memory here.
+ detail::binder2<Handler, asio::error_code, results_type>
+ handler(o->handler_, o->ec_, o->results_);
+ p.h = asio::detail::addressof(handler.handler_);
+ p.reset();
+
+ if (owner)
+ {
+ fenced_block b(fenced_block::half);
+ ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, "..."));
+ w.complete(handler, handler.handler_);
+ ASIO_HANDLER_INVOCATION_END;
+ }
+ }
+ }
+
+private:
+ socket_ops::weak_cancel_token_type cancel_token_;
+ endpoint_type endpoint_;
+ scheduler_impl& scheduler_;
+ Handler handler_;
+ handler_work<Handler, IoExecutor> work_;
+ results_type results_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_RESOLVER_ENDPOINT_OP_HPP