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132 lines
3.6 KiB
C++
Executable file
132 lines
3.6 KiB
C++
Executable file
// Copyright (c) 2016 Klemens D. Morgenstern
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/** \file boost/process/async.hpp
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The header which provides the basic asynchrounous features.
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It provides the on_exit property, which allows callbacks when the process exits.
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It also implements the necessary traits for passing an boost::asio::io_context,
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which is needed for asynchronous communication.
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It also pulls the [boost::asio::buffer](http://www.boost.org/doc/libs/release/doc/html/boost_asio/reference/buffer.html)
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into the boost::process namespace for convenience.
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\xmlonly
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<programlisting>
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namespace boost {
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namespace process {
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<emphasis>unspecified</emphasis> <ulink url="http://www.boost.org/doc/libs/1_61_0/doc/html/boost_asio/reference/buffer.html">buffer</ulink>;
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<emphasis>unspecified</emphasis> <globalname alt="boost::process::on_exit">on_exit</globalname>;
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}
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}
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</programlisting>
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\endxmlonly
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*/
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#ifndef BOOST_PROCESS_ASYNC_HPP_
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#define BOOST_PROCESS_ASYNC_HPP_
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#include <boost/process/detail/traits.hpp>
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#include <boost/process/detail/on_exit.hpp>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/streambuf.hpp>
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#include <boost/asio/buffer.hpp>
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#include <type_traits>
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#include <boost/fusion/iterator/deref.hpp>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/detail/posix/io_context_ref.hpp>
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#include <boost/process/detail/posix/async_in.hpp>
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#include <boost/process/detail/posix/async_out.hpp>
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#include <boost/process/detail/posix/on_exit.hpp>
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#elif defined(BOOST_WINDOWS_API)
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#include <boost/process/detail/windows/io_context_ref.hpp>
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#include <boost/process/detail/windows/async_in.hpp>
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#include <boost/process/detail/windows/async_out.hpp>
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#include <boost/process/detail/windows/on_exit.hpp>
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#endif
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namespace boost { namespace process { namespace detail {
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struct async_tag;
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template<typename T>
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struct is_io_context : std::false_type {};
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template<>
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struct is_io_context<api::io_context_ref> : std::true_type {};
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template<typename Tuple>
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inline asio::io_context& get_io_context(const Tuple & tup)
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{
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auto& ref = *boost::fusion::find_if<is_io_context<boost::mpl::_>>(tup);
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return ref.get();
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}
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struct async_builder
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{
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boost::asio::io_context * ios;
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void operator()(boost::asio::io_context & ios_) {this->ios = &ios_;};
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typedef api::io_context_ref result_type;
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api::io_context_ref get_initializer() {return api::io_context_ref (*ios);};
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};
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template<>
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struct initializer_builder<async_tag>
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{
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typedef async_builder type;
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};
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}
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using ::boost::asio::buffer;
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#if defined(BOOST_PROCESS_DOXYGEN)
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/** When an io_context is passed, the on_exit property can be used, to be notified
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when the child process exits.
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The following syntax is valid
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\code{.cpp}
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on_exit=function;
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on_exit(function);
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\endcode
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with `function` being a callable object with the signature `(int, const std::error_code&)` or an
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`std::future<int>`.
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\par Example
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\code{.cpp}
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io_context ios;
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child c("ls", ios, on_exit=[](int exit, const std::error_code& ec_in){});
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std::future<int> exit_code;
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chlid c2("ls", ios, on_exit=exit_code);
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\endcode
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\note The handler is not invoked when the launch fails.
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\warning When used \ref ignore_error it might get invoked on error.
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\warning `on_exit` uses `boost::asio::signal_set` to listen for `SIGCHLD` on posix, and so has the
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same restrictions as that class (do not register a handler for `SIGCHLD` except by using
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`boost::asio::signal_set`).
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*/
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constexpr static ::boost::process::detail::on_exit_ on_exit{};
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#endif
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}}
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#endif /* INCLUDE_BOOST_PROCESS_DETAIL_ASYNC_HPP_ */
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