Function remove_all_nt6_by_handle

src/operations.cpp:2073–2178

remove_all() by handle implementation for Windows Vista and newer

//! remove_all() by handle implementation for Windows Vista and newer
uintmax_t remove_all_nt6_by_handle(HANDLE h, path const& p, error_code* ec)
{
    error_code local_ec;
    fs::file_status st(fs::detail::status_by_handle(h, p, &local_ec));
    if (BOOST_UNLIKELY(st.type() == fs::status_error))
    {
        if (!ec)
            BOOST_FILESYSTEM_THROW(filesystem_error("boost::filesystem::remove_all", p, local_ec));

        *ec = local_ec;
        return static_cast< uintmax_t >(-1);
    }

    uintmax_t count = 0u;
    if (st.type() == fs::directory_file)
    {
        local_ec.clear();

        fs::directory_iterator itr;
        directory_iterator_params params;
        params.dir_handle = h;
        params.close_handle = false; // the caller will close the handle
        fs::detail::directory_iterator_construct(itr, p, directory_options::_detail_no_follow, &params, &local_ec);
        if (BOOST_UNLIKELY(!!local_ec))
        {
            if (!ec)
                BOOST_FILESYSTEM_THROW(filesystem_error("boost::filesystem::remove_all", p, local_ec));

            *ec = local_ec;
            return static_cast< uintmax_t >(-1);
        }

        NtCreateFile_t* nt_create_file = filesystem::detail::atomic_load_relaxed(nt_create_file_api);
        const fs::directory_iterator end_dit;
        while (itr != end_dit)
        {
            fs::path nested_path(itr->path());
            unique_handle hh;
            if (BOOST_LIKELY(nt_create_file != nullptr))
            {
                // Note: WinAPI methods like CreateFileW implicitly request SYNCHRONIZE access but NtCreateFile doesn't.
                // Without SYNCHRONIZE access querying file attributes via GetFileInformationByHandleEx fails with ERROR_ACCESS_DENIED.
                boost::winapi::NTSTATUS_ status = nt_create_file_handle_at
                (
                    hh,
                    h,
                    path_algorithms::filename_v4(nested_path),
                    0u, // FileAttributes
                    FILE_LIST_DIRECTORY | DELETE | FILE_READ_ATTRIBUTES | FILE_READ_EA | FILE_WRITE_ATTRIBUTES | FILE_WRITE_EA | SYNCHRONIZE,
                    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                    FILE_OPEN,
                    FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_FOR_BACKUP_INTENT | FILE_OPEN_REPARSE_POINT
                );

                if (!NT_SUCCESS(status))
                {
                    if (not_found_ntstatus(status))
                        goto next_entry;