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+// Copyright (c) 2016 Klemens D. Morgenstern
+//
+// 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 BOOST_PROCESS_POSIX_IO_SERVICE_REF_HPP_
+#define BOOST_PROCESS_POSIX_IO_SERVICE_REF_HPP_
+
+#include <boost/process/detail/posix/handler.hpp>
+#include <boost/process/detail/posix/async_handler.hpp>
+#include <boost/asio/io_service.hpp>
+#include <boost/asio/signal_set.hpp>
+
+#include <boost/fusion/algorithm/iteration/for_each.hpp>
+#include <boost/fusion/algorithm/transformation/filter_if.hpp>
+#include <boost/fusion/algorithm/transformation/transform.hpp>
+#include <boost/fusion/view/transform_view.hpp>
+#include <boost/fusion/container/vector/convert.hpp>
+
+
+#include <functional>
+#include <type_traits>
+#include <memory>
+#include <vector>
+#include <sys/wait.h>
+
+namespace boost { namespace process { namespace detail { namespace posix {
+
+template<typename Executor>
+struct on_exit_handler_transformer
+{
+ Executor & exec;
+ on_exit_handler_transformer(Executor & exec) : exec(exec) {}
+ template<typename Sig>
+ struct result;
+
+ template<typename T>
+ struct result<on_exit_handler_transformer<Executor>(T&)>
+ {
+ typedef typename T::on_exit_handler_t type;
+ };
+
+ template<typename T>
+ auto operator()(T& t) const -> typename T::on_exit_handler_t
+ {
+ return t.on_exit_handler(exec);
+ }
+};
+
+template<typename Executor>
+struct async_handler_collector
+{
+ Executor & exec;
+ std::vector<std::function<void(int, const std::error_code & ec)>> &handlers;
+
+
+ async_handler_collector(Executor & exec,
+ std::vector<std::function<void(int, const std::error_code & ec)>> &handlers)
+ : exec(exec), handlers(handlers) {}
+
+ template<typename T>
+ void operator()(T & t) const
+ {
+ handlers.push_back(t.on_exit_handler(exec));
+ };
+};
+
+//Also set's up waiting for the exit, so it can close async stuff.
+struct io_service_ref : handler_base_ext
+{
+ io_service_ref(boost::asio::io_service & ios) : ios(ios)
+ {
+
+ }
+ boost::asio::io_service &get() {return ios;};
+
+ boost::asio::signal_set *signal_p = nullptr;
+
+ template <class Executor>
+ void on_setup(Executor& exec)
+ {
+ //must be on the heap so I can move it into the lambda.
+ auto asyncs = boost::fusion::filter_if<
+ is_async_handler<
+ typename std::remove_reference< boost::mpl::_ > ::type
+ >>(exec.seq);
+
+ //ok, check if there are actually any.
+ if (boost::fusion::empty(asyncs))
+ return;
+
+ std::vector<std::function<void(int, const std::error_code & ec)>> funcs;
+ funcs.reserve(boost::fusion::size(asyncs));
+ boost::fusion::for_each(asyncs, async_handler_collector<Executor>(exec, funcs));
+
+ wait_handler wh(std::move(funcs), ios, exec.exit_status);
+
+ signal_p = wh.signal_.get();
+ signal_p->async_wait(std::move(wh));
+
+ }
+
+ template <class Executor>
+ void on_error(Executor & exec, const std::error_code & ec) const
+ {
+ if (signal_p != nullptr)
+ {
+ boost::system::error_code ec;
+ signal_p->cancel(ec);
+ }
+ }
+
+ struct wait_handler
+ {
+ std::shared_ptr<boost::asio::signal_set> signal_;
+ std::vector<std::function<void(int, const std::error_code & ec)>> funcs;
+ std::shared_ptr<std::atomic<int>> exit_status;
+
+ wait_handler(const wait_handler & ) = default;
+ wait_handler(wait_handler && ) = default;
+ wait_handler(
+ std::vector<std::function<void(int, const std::error_code & ec)>> && funcs,
+ boost::asio::io_service & ios,
+ const std::shared_ptr<std::atomic<int>> &exit_status)
+ : signal_(new boost::asio::signal_set(ios, SIGCHLD)),
+ funcs(std::move(funcs)),
+ exit_status(exit_status)
+ {
+
+ }
+ void operator()(const boost::system::error_code & ec_in, int /*signal*/)
+ {
+ if (ec_in.value() == boost::asio::error::operation_aborted)
+ return;
+
+
+ int status;
+ ::wait(&status);
+
+ std::error_code ec(ec_in.value(), std::system_category());
+ int val = WEXITSTATUS(status);
+ exit_status->store(status);
+
+ for (auto & func : funcs)
+ func(val, ec);
+ }
+
+ };
+private:
+ boost::asio::io_service &ios;
+};
+
+}}}}
+
+#endif /* BOOST_PROCESS_WINDOWS_IO_SERVICE_REF_HPP_ */