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// Copyright (c) 2006, 2007 Julio M. Merino Vidal // Copyright (c) 2008 Ilya Sokolov, Boris Schaeling // Copyright (c) 2009 Boris Schaeling // Copyright (c) 2010 Felipe Tanus, Boris Schaeling // Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling // 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_ERROR_HPP #define BOOST_PROCESS_DETAIL_ERROR_HPP #include <boost/process/detail/config.hpp> #include <boost/process/detail/traits.hpp> #if defined(BOOST_POSIX_API) #include <boost/process/detail/posix/handler.hpp> #elif defined(BOOST_WINDOWS_API) #include <boost/process/detail/windows/handler.hpp> #endif #include <system_error> #include <type_traits> #include <boost/fusion/algorithm/query/find_if.hpp> #include <boost/fusion/sequence/intrinsic/begin.hpp> #include <boost/fusion/sequence/intrinsic/end.hpp> #include <boost/fusion/container/vector/convert.hpp> #include <boost/fusion/iterator/deref.hpp> #include <boost/fusion/sequence/comparison/equal_to.hpp> #include <boost/fusion/container/set/convert.hpp> #include <boost/type_index.hpp> /** \file boost/process/error.hpp * * Header which provides the error properties. It allows to explicitly set the error handling, the properties are: * \xmlonly <programlisting> namespace boost { namespace process { <emphasis>unspecified</emphasis> <globalname alt="boost::process::ignore_error">ignore_error</globalname>; <emphasis>unspecified</emphasis> <globalname alt="boost::process::throw_on_error">throw_on_error</globalname>; <emphasis>unspecified</emphasis> <globalname alt="boost::process::error">error</globalname>; <emphasis>unspecified</emphasis> <globalname alt="boost::process::error_ref">error_ref</globalname>; <emphasis>unspecified</emphasis> <globalname alt="boost::process::error_code">error_code</globalname>; } } </programlisting> \endxmlonly * For error there are two aliases: error_ref and error_code */ namespace boost { namespace process { namespace detail { struct throw_on_error_ : ::boost::process::detail::api::handler_base_ext { constexpr throw_on_error_() = default; template <class Executor> void on_error(Executor&, const std::error_code & ec) const { throw process_error(ec, "process creation failed"); } const throw_on_error_ &operator()() const {return *this;} }; struct ignore_error_ : ::boost::process::detail::api::handler_base_ext { constexpr ignore_error_() = default; }; struct set_on_error : ::boost::process::detail::api::handler_base_ext { set_on_error(const set_on_error&) = default; explicit set_on_error(std::error_code &ec) : ec_(ec) {} template <class Executor> void on_error(Executor&, const std::error_code & ec) const noexcept { ec_ = ec; } private: std::error_code &ec_; }; struct error_ { constexpr error_() = default; set_on_error operator()(std::error_code &ec) const {return set_on_error(ec);} set_on_error operator= (std::error_code &ec) const {return set_on_error(ec);} }; template<typename T> struct is_error_handler : std::false_type {}; template<> struct is_error_handler<set_on_error> : std::true_type {}; template<> struct is_error_handler<throw_on_error_> : std::true_type {}; template<> struct is_error_handler<ignore_error_> : std::true_type {}; template<typename Iterator, typename End> struct has_error_handler_impl { typedef typename boost::fusion::result_of::deref<Iterator>::type ref_type; typedef typename std::remove_reference<ref_type>::type res_type_; typedef typename std::remove_cv<res_type_>::type res_type; typedef typename is_error_handler<res_type>::type cond; typedef typename boost::fusion::result_of::next<Iterator>::type next_itr; typedef typename has_error_handler_impl<next_itr, End>::type next; typedef typename boost::mpl::or_<cond, next>::type type; }; template<typename Iterator> struct has_error_handler_impl<Iterator, Iterator> { typedef boost::mpl::false_ type; }; template<typename Sequence> struct has_error_handler { typedef typename boost::fusion::result_of::as_vector<Sequence>::type vector_type; typedef typename has_error_handler_impl< typename boost::fusion::result_of::begin<vector_type>::type, typename boost::fusion::result_of::end< vector_type>::type >::type type; }; template<typename Sequence> struct has_ignore_error { typedef typename boost::fusion::result_of::as_set<Sequence>::type set_type; typedef typename boost::fusion::result_of::has_key<set_type, ignore_error_>::type type1; typedef typename boost::fusion::result_of::has_key<set_type, ignore_error_&>::type type2; typedef typename boost::fusion::result_of::has_key<set_type, const ignore_error_&>::type type3; typedef typename boost::mpl::or_<type1,type2, type3>::type type; }; struct error_builder { std::error_code *err; typedef set_on_error result_type; set_on_error get_initializer() {return set_on_error(*err);}; void operator()(std::error_code & ec) {err = &ec;}; }; template<> struct initializer_tag<std::error_code> { typedef error_tag type; }; template<> struct initializer_builder<error_tag> { typedef error_builder type; }; } /**The ignore_error property will disable any error handling. This can be useful on linux, where error handling will require a pipe.*/ constexpr boost::process::detail::ignore_error_ ignore_error; /**The throw_on_error property will enable the exception when launching a process. It is unnecessary by default, but may be used, when an additional error_code is provided.*/ constexpr boost::process::detail::throw_on_error_ throw_on_error; /** The error property will set the executor to handle any errors by setting an [std::error_code](http://en.cppreference.com/w/cpp/error/error_code). \code{.cpp} std::error_code ec; system("gcc", error(ec)); \endcode The following syntax is valid: \code{.cpp} error(ec); error=ec; \endcode The overload version is achieved by just passing an object of [std::error_code](http://en.cppreference.com/w/cpp/error/error_code) to the function. */ constexpr boost::process::detail::error_ error; ///Alias for \xmlonly <globalname alt="boost::process::error">error</globalname> \endxmlonly . constexpr boost::process::detail::error_ error_ref; ///Alias for \xmlonly <globalname alt="boost::process::error">error</globalname> \endxmlonly . constexpr boost::process::detail::error_ error_code; }} #endif