1 files changed, 41 insertions, 0 deletions
diff --git a/boost/process/detail/windows/compare_handles.hpp b/boost/process/detail/windows/compare_handles.hpp
new file mode 100644
index 0000000000..1eafd43209
--- /dev/null
+++ b/boost/process/detail/windows/compare_handles.hpp
@@ -0,0 +1,41 @@
+// 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_WINDOWS_COMPARE_HANDLES_HPP_
+#define BOOST_PROCESS_DETAIL_WINDOWS_COMPARE_HANDLES_HPP_
+
+#include <boost/detail/winapi/handles.hpp>
+#include <boost/detail/winapi/file_management.hpp>
+#include <boost/process/detail/config.hpp>
+
+namespace boost { namespace process { namespace detail { namespace windows {
+
+inline bool compare_handles(boost::detail::winapi::HANDLE_ lhs, boost::detail::winapi::HANDLE_ rhs)
+{
+    if ( (lhs == ::boost::detail::winapi::INVALID_HANDLE_VALUE_)
+      || (rhs == ::boost::detail::winapi::INVALID_HANDLE_VALUE_))
+        return false;
+
+    if (lhs == rhs)
+        return true;
+
+    ::boost::detail::winapi::BY_HANDLE_FILE_INFORMATION_ lhs_info{0,{0,0},{0,0},{0,0},0,0,0,0,0,0};
+    ::boost::detail::winapi::BY_HANDLE_FILE_INFORMATION_ rhs_info{0,{0,0},{0,0},{0,0},0,0,0,0,0,0};
+
+    if (!::boost::detail::winapi::GetFileInformationByHandle(lhs, &lhs_info))
+        ::boost::process::detail::throw_last_error("GetFileInformationByHandle");
+
+    if (!::boost::detail::winapi::GetFileInformationByHandle(rhs, &rhs_info))
+        ::boost::process::detail::throw_last_error("GetFileInformationByHandle");
+
+    return     (lhs_info.nFileIndexHigh == rhs_info.nFileIndexHigh)
+            && (lhs_info.nFileIndexLow  == rhs_info.nFileIndexLow);
+}
+
+}}}}
+
+
+
+#endif /* BOOST_PROCESS_DETAIL_WINDOWS_COMPARE_HANDLES_HPP_ */