f->open = prebuffer_open;
f->close = prebuffer_close;
f->parse_config = prebuffer_parse_config;
f->free_config = prebuffer_free_config;
f->pre_select = prebuffer_pre_select;
f->post_select = prebuffer_post_select;
f->open = prebuffer_open;
f->close = prebuffer_close;
f->parse_config = prebuffer_parse_config;
f->free_config = prebuffer_free_config;
f->pre_select = prebuffer_pre_select;
f->post_select = prebuffer_post_select;