along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <stdbool.h>
+#include <sys/types.h>
+
+int copy_file_fd(const char *from, int to);
int copy_file(const char *from, const char *to, int flags, mode_t mode);
int copy_tree(const char *from, const char *to, bool merge);
int copy_bytes(int fdf, int fdt, off_t max_bytes);