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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_DETAIL_POSIX_ASYNC_PIPE_HPP_
+#define BOOST_PROCESS_DETAIL_POSIX_ASYNC_PIPE_HPP_
+
+
+#include <boost/process/detail/posix/basic_pipe.hpp>
+#include <boost/asio/posix/stream_descriptor.hpp>
+#include <system_error>
+#include <string>
+
+namespace boost { namespace process { namespace detail { namespace posix {
+
+class async_pipe
+{
+ ::boost::asio::posix::stream_descriptor _source;
+ ::boost::asio::posix::stream_descriptor _sink ;
+public:
+ typedef int native_handle_type;
+ typedef ::boost::asio::posix::stream_descriptor handle_type;
+
+ inline async_pipe(boost::asio::io_service & ios) : async_pipe(ios, ios) {}
+
+ inline async_pipe(boost::asio::io_service & ios_source,
+ boost::asio::io_service & ios_sink) : _source(ios_source), _sink(ios_sink)
+ {
+ int fds[2];
+ if (::pipe(fds) == -1)
+ boost::process::detail::throw_last_error("pipe(2) failed");
+
+ _source.assign(fds[0]);
+ _sink .assign(fds[1]);
+ };
+ inline async_pipe(boost::asio::io_service & ios, const std::string & name)
+ : async_pipe(ios, ios, name) {}
+
+ inline async_pipe(boost::asio::io_service & ios_source,
+ boost::asio::io_service & io_sink, const std::string & name);
+ inline async_pipe(const async_pipe& lhs);
+ async_pipe(async_pipe&& lhs) : _source(std::move(lhs._source)), _sink(std::move(lhs._sink))
+ {
+ lhs._source.assign (-1);
+ lhs._sink .assign (-1);
+ }
+
+ template<class CharT, class Traits = std::char_traits<CharT>>
+ explicit async_pipe(::boost::asio::io_service & ios_source,
+ ::boost::asio::io_service & ios_sink,
+ const basic_pipe<CharT, Traits> & p)
+ : _source(ios_source, p.native_source()), _sink(ios_sink, p.native_sink())
+ {
+ }
+
+ template<class CharT, class Traits = std::char_traits<CharT>>
+ explicit async_pipe(boost::asio::io_service & ios, const basic_pipe<CharT, Traits> & p)
+ : async_pipe(ios, ios, p)
+ {
+ }
+
+ template<class CharT, class Traits = std::char_traits<CharT>>
+ inline async_pipe& operator=(const basic_pipe<CharT, Traits>& p);
+ inline async_pipe& operator=(const async_pipe& rhs);
+
+ inline async_pipe& operator=(async_pipe&& lhs);
+
+ ~async_pipe()
+ {
+ if (_sink .native() != -1)
+ ::close(_sink.native());
+ if (_source.native() != -1)
+ ::close(_source.native());
+ }
+
+ template<class CharT, class Traits = std::char_traits<CharT>>
+ inline explicit operator basic_pipe<CharT, Traits>() const;
+
+ void cancel()
+ {
+ if (_sink.is_open())
+ _sink.cancel();
+ if (_source.is_open())
+ _source.cancel();
+ }
+
+ void close()
+ {
+ if (_sink.is_open())
+ _sink.close();
+ if (_source.is_open())
+ _source.close();
+ }
+ void close(boost::system::error_code & ec)
+ {
+ if (_sink.is_open())
+ _sink.close(ec);
+ if (_source.is_open())
+ _source.close(ec);
+ }
+
+
+ bool is_open() const
+ {
+ return _sink.is_open() || _source.is_open();
+ }
+ void async_close()
+ {
+ if (_sink.is_open())
+ _sink.get_io_service(). post([this]{_sink.close();});
+ if (_source.is_open())
+ _source.get_io_service().post([this]{_source.close();});
+ }
+
+ template<typename MutableBufferSequence>
+ std::size_t read_some(const MutableBufferSequence & buffers)
+ {
+ return _source.read_some(buffers);
+ }
+ template<typename MutableBufferSequence>
+ std::size_t write_some(const MutableBufferSequence & buffers)
+ {
+ return _sink.write_some(buffers);
+ }
+
+ native_handle_type native_source() const {return const_cast<boost::asio::posix::stream_descriptor&>(_source).native();}
+ native_handle_type native_sink () const {return const_cast<boost::asio::posix::stream_descriptor&>(_sink ).native();}
+
+ template<typename MutableBufferSequence,
+ typename ReadHandler>
+ BOOST_ASIO_INITFN_RESULT_TYPE(
+ ReadHandler, void(boost::system::error_code, std::size_t))
+ async_read_some(
+ const MutableBufferSequence & buffers,
+ ReadHandler &&handler)
+ {
+ _source.async_read_some(buffers, std::forward<ReadHandler>(handler));
+ }
+
+ template<typename ConstBufferSequence,
+ typename WriteHandler>
+ BOOST_ASIO_INITFN_RESULT_TYPE(
+ WriteHandler, void(boost::system::error_code, std::size_t))
+ async_write_some(
+ const ConstBufferSequence & buffers,
+ WriteHandler&& handler)
+ {
+ _sink.async_write_some(buffers, std::forward<WriteHandler>(handler));
+ }
+
+
+ const handle_type & sink () const & {return _sink;}
+ const handle_type & source() const & {return _source;}
+
+ handle_type && sink() && { return std::move(_sink); }
+ handle_type && source()&& { return std::move(_source); }
+
+ handle_type source(::boost::asio::io_service& ios) &&
+ {
+ ::boost::asio::posix::stream_descriptor stolen(ios, _source.release());
+ return stolen;
+ }
+ handle_type sink (::boost::asio::io_service& ios) &&
+ {
+ ::boost::asio::posix::stream_descriptor stolen(ios, _sink.release());
+ return stolen;
+ }
+
+ handle_type source(::boost::asio::io_service& ios) const &
+ {
+ auto source_in = const_cast<::boost::asio::posix::stream_descriptor &>(_source).native();
+ return ::boost::asio::posix::stream_descriptor(ios, ::dup(source_in));
+ }
+ handle_type sink (::boost::asio::io_service& ios) const &
+ {
+ auto sink_in = const_cast<::boost::asio::posix::stream_descriptor &>(_sink).native();
+ return ::boost::asio::posix::stream_descriptor(ios, ::dup(sink_in));
+ }
+};
+
+
+async_pipe::async_pipe(boost::asio::io_service & ios_source,
+ boost::asio::io_service & ios_sink,
+ const std::string & name) : _source(ios_source), _sink(ios_sink)
+{
+ auto fifo = mkfifo(name.c_str(), 0666 );
+
+ if (fifo != 0)
+ boost::process::detail::throw_last_error("mkfifo() failed");
+
+
+ int read_fd = open(name.c_str(), O_RDWR);
+
+ if (read_fd == -1)
+ boost::process::detail::throw_last_error();
+
+ int write_fd = dup(read_fd);
+
+ if (write_fd == -1)
+ boost::process::detail::throw_last_error();
+
+ _source.assign(read_fd);
+ _sink .assign(write_fd);
+}
+
+async_pipe::async_pipe(const async_pipe & p) :
+ _source(const_cast<async_pipe&>(p)._source.get_io_service()),
+ _sink( const_cast<async_pipe&>(p)._sink.get_io_service())
+{
+
+ //cannot get the handle from a const object.
+ auto source_in = const_cast<::boost::asio::posix::stream_descriptor &>(_source).native();
+ auto sink_in = const_cast<::boost::asio::posix::stream_descriptor &>(_sink).native();
+ if (source_in == -1)
+ _source.assign(-1);
+ else
+ {
+ _source.assign(::dup(source_in));
+ if (_source.native()== -1)
+ ::boost::process::detail::throw_last_error("dup()");
+ }
+
+ if (sink_in == -1)
+ _sink.assign(-1);
+ else
+ {
+ _sink.assign(::dup(sink_in));
+ if (_sink.native() == -1)
+ ::boost::process::detail::throw_last_error("dup()");
+ }
+}
+
+async_pipe& async_pipe::operator=(const async_pipe & p)
+{
+ int source;
+ int sink;
+
+ //cannot get the handle from a const object.
+ auto source_in = const_cast<::boost::asio::posix::stream_descriptor &>(_source).native();
+ auto sink_in = const_cast<::boost::asio::posix::stream_descriptor &>(_sink).native();
+ if (source_in == -1)
+ source = -1;
+ else
+ {
+ source = ::dup(source_in);
+ if (source == -1)
+ ::boost::process::detail::throw_last_error("dup()");
+ }
+
+ if (sink_in == -1)
+ sink = -1;
+ else
+ {
+ sink = ::dup(sink_in);
+ if (sink == -1)
+ ::boost::process::detail::throw_last_error("dup()");
+ }
+ _source.assign(source);
+ _sink. assign(sink);
+
+ return *this;
+}
+
+async_pipe& async_pipe::operator=(async_pipe && lhs)
+{
+ if (_source.native_handle() == -1)
+ ::close(_source.native());
+
+ if (_sink.native_handle() == -1)
+ ::close(_sink.native());
+
+ _source.assign(lhs._source.native_handle());
+ _sink .assign(lhs._sink .native_handle());
+ lhs._source.assign(-1);
+ lhs._sink .assign(-1);
+ return *this;
+}
+
+template<class CharT, class Traits>
+async_pipe::operator basic_pipe<CharT, Traits>() const
+{
+ int source;
+ int sink;
+
+ //cannot get the handle from a const object.
+ auto source_in = const_cast<::boost::asio::posix::stream_descriptor &>(_source).native();
+ auto sink_in = const_cast<::boost::asio::posix::stream_descriptor &>(_sink).native();
+
+
+ if (source_in == -1)
+ source = -1;
+ else
+ {
+ source = ::dup(source_in);
+ if (source == -1)
+ ::boost::process::detail::throw_last_error("dup()");
+ }
+
+ if (sink_in == -1)
+ sink = -1;
+ else
+ {
+ sink = ::dup(sink_in);
+ if (sink == -1)
+ ::boost::process::detail::throw_last_error("dup()");
+ }
+
+ return basic_pipe<CharT, Traits>{source, sink};
+}
+
+
+inline bool operator==(const async_pipe & lhs, const async_pipe & rhs)
+{
+ return compare_handles(lhs.native_source(), rhs.native_source()) &&
+ compare_handles(lhs.native_sink(), rhs.native_sink());
+}
+
+inline bool operator!=(const async_pipe & lhs, const async_pipe & rhs)
+{
+ return !compare_handles(lhs.native_source(), rhs.native_source()) ||
+ !compare_handles(lhs.native_sink(), rhs.native_sink());
+}
+
+template<class Char, class Traits>
+inline bool operator==(const async_pipe & lhs, const basic_pipe<Char, Traits> & rhs)
+{
+ return compare_handles(lhs.native_source(), rhs.native_source()) &&
+ compare_handles(lhs.native_sink(), rhs.native_sink());
+}
+
+template<class Char, class Traits>
+inline bool operator!=(const async_pipe & lhs, const basic_pipe<Char, Traits> & rhs)
+{
+ return !compare_handles(lhs.native_source(), rhs.native_source()) ||
+ !compare_handles(lhs.native_sink(), rhs.native_sink());
+}
+
+template<class Char, class Traits>
+inline bool operator==(const basic_pipe<Char, Traits> & lhs, const async_pipe & rhs)
+{
+ return compare_handles(lhs.native_source(), rhs.native_source()) &&
+ compare_handles(lhs.native_sink(), rhs.native_sink());
+}
+
+template<class Char, class Traits>
+inline bool operator!=(const basic_pipe<Char, Traits> & lhs, const async_pipe & rhs)
+{
+ return !compare_handles(lhs.native_source(), rhs.native_source()) ||
+ !compare_handles(lhs.native_sink(), rhs.native_sink());
+}
+
+}}}}
+
+#endif /* INCLUDE_BOOST_PIPE_DETAIL_WINDOWS_ASYNC_PIPE_HPP_ */