struct dfm_writer *dfm_open_writer (struct file_handle *);
bool dfm_close_writer (struct dfm_writer *);
bool dfm_write_error (const struct dfm_writer *);
struct dfm_writer *dfm_open_writer (struct file_handle *);
bool dfm_close_writer (struct dfm_writer *);
bool dfm_write_error (const struct dfm_writer *);