w->pre_select = file_write_pre_select;
w->post_select = file_write_post_select;
w->parse_config_or_die = file_write_parse_config_or_die;
w->pre_select = file_write_pre_select;
w->post_select = file_write_post_select;
w->parse_config_or_die = file_write_parse_config_or_die;