// Copyright (c) 2019 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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#ifndef BOOST_PROCESS_DETAIL_WINDOWS_HANDLES_HPP_
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#define BOOST_PROCESS_DETAIL_WINDOWS_HANDLES_HPP_
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#include <vector>
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#include <system_error>
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#include <boost/process/detail/windows/handle_workaround.hpp>
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#include <boost/process/detail/windows/handler.hpp>
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#include <boost/winapi/get_current_process_id.hpp>
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namespace boost { namespace process { namespace detail {
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template<typename Executor, typename Function>
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void foreach_used_handle(Executor &exec, Function &&func);
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namespace windows {
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using native_handle_type = ::boost::winapi::HANDLE_ ;
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inline std::vector<native_handle_type> get_handles(std::error_code & ec)
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{
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auto pid = ::boost::winapi::GetCurrentProcessId();
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std::vector<char> buffer(2048);
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constexpr static auto STATUS_INFO_LENGTH_MISMATCH_ = static_cast<::boost::winapi::NTSTATUS_>(0xC0000004l);
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auto info_pointer = reinterpret_cast<workaround::SYSTEM_HANDLE_INFORMATION_*>(buffer.data());
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::boost::winapi::NTSTATUS_ nt_status = STATUS_INFO_LENGTH_MISMATCH_;
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for (;
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nt_status == STATUS_INFO_LENGTH_MISMATCH_;
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nt_status = workaround::nt_system_query_information(
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workaround::SystemHandleInformation_,
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info_pointer, static_cast<::boost::winapi::ULONG_>(buffer.size()),
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nullptr))
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{
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buffer.resize(buffer.size() * 2);
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info_pointer = reinterpret_cast<workaround::SYSTEM_HANDLE_INFORMATION_*>(buffer.data());
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}
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if (nt_status < 0 || nt_status > 0x7FFFFFFF)
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{
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ec = ::boost::process::detail::get_last_error();
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return {};
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}
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else
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ec.clear();
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std::vector<native_handle_type> res;
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for (auto itr = info_pointer->Handle; itr != (info_pointer->Handle + info_pointer->Count); itr++)
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{
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if (itr->OwnerPid == pid)
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res.push_back(reinterpret_cast<native_handle_type>(static_cast<std::uintptr_t>(itr->HandleValue)));
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}
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return res;
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}
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inline std::vector<native_handle_type> get_handles()
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{
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std::error_code ec;
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auto res = get_handles(ec);
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if (ec)
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boost::process::detail::throw_error(ec, "NtQuerySystemInformation failed");
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return res;
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}
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inline bool is_stream_handle(native_handle_type handle, std::error_code & ec)
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{
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::boost::winapi::ULONG_ actual_size;
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auto nt_status = workaround::nt_query_object(
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handle,
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workaround::ObjectTypeInformation,
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NULL,
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0, &actual_size);
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std::vector<char> vec;
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vec.resize(actual_size);
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workaround::OBJECT_TYPE_INFORMATION_ * type_info_p = reinterpret_cast<workaround::OBJECT_TYPE_INFORMATION_*>(vec.data());
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nt_status = workaround::nt_query_object(
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handle,
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workaround::ObjectTypeInformation,
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type_info_p,
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actual_size, &actual_size);
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if (nt_status < 0 || nt_status > 0x7FFFFFFF)
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{
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ec = ::boost::process::detail::get_last_error();
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return false;
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}
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else
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ec.clear();
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auto &nm = type_info_p->TypeName.Buffer;
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return type_info_p->TypeName.Length >= 5 &&
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nm[0] == L'F' &&
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nm[1] == L'i' &&
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nm[2] == L'l' &&
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nm[3] == L'e' &&
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nm[4] == L'\0';
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}
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inline bool is_stream_handle(native_handle_type handle)
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{
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std::error_code ec;
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auto res = is_stream_handle(handle, ec);
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if (ec)
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boost::process::detail::throw_error(ec, "NtQueryObject failed");
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return res;
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}
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struct limit_handles_ : handler_base_ext
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{
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mutable std::vector<::boost::winapi::HANDLE_> handles_with_inherit_flag;
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template<typename Executor>
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void on_setup(Executor & exec) const
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{
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auto all_handles = get_handles();
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foreach_used_handle(exec,
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[&](::boost::winapi::HANDLE_ handle)
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{
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auto itr = std::find(all_handles.begin(), all_handles .end(), handle);
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DWORD flags = 0u;
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if (itr != all_handles.end())
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*itr = ::boost::winapi::INVALID_HANDLE_VALUE_;
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else if ((::boost::winapi::GetHandleInformation(*itr, &flags) != 0)
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&&((flags & ::boost::winapi::HANDLE_FLAG_INHERIT_) == 0)) //it is NOT inherited anyhow, so ignore too
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*itr = ::boost::winapi::INVALID_HANDLE_VALUE_;
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});
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auto part_itr = std::partition(all_handles.begin(), all_handles.end(),
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[](::boost::winapi::HANDLE_ handle) {return handle != ::boost::winapi::INVALID_HANDLE_VALUE_;});
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all_handles.erase(part_itr, all_handles.end()); //remove invalid handles
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handles_with_inherit_flag = std::move(all_handles);
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for (auto handle : handles_with_inherit_flag)
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::boost::winapi::SetHandleInformation(handle, ::boost::winapi::HANDLE_FLAG_INHERIT_, 0);
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}
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template<typename Executor>
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void on_error(Executor & exec, const std::error_code & ec) const
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{
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for (auto handle : handles_with_inherit_flag)
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::boost::winapi::SetHandleInformation(handle, ::boost::winapi::HANDLE_FLAG_INHERIT_, ::boost::winapi::HANDLE_FLAG_INHERIT_);
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}
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template<typename Executor>
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void on_sucess(Executor & exec) const
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{
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for (auto handle : handles_with_inherit_flag)
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::boost::winapi::SetHandleInformation(handle, ::boost::winapi::HANDLE_FLAG_INHERIT_, ::boost::winapi::HANDLE_FLAG_INHERIT_);
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}
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};
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}}}}
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#endif //PROCESS_HANDLES_HPP
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