+/* Error codes returned by qcopy_file_preserving. */
+enum
+{
+ GL_COPY_ERR_OPEN_READ = -1,
+ GL_COPY_ERR_OPEN_BACKUP_WRITE = -2,
+ GL_COPY_ERR_READ = -3,
+ GL_COPY_ERR_WRITE = -4,
+ GL_COPY_ERR_AFTER_READ = -5,
+ GL_COPY_ERR_GET_ACL = -6,
+ GL_COPY_ERR_SET_ACL = -7
+};
+
+/* Copy a regular file: from src_filename to dest_filename.
+ The destination file is assumed to be a backup file.
+ Modification times, owner, group and access permissions are preserved as
+ far as possible.
+ Return 0 if successful, otherwise set errno and return one of the error
+ codes above. */
+extern int qcopy_file_preserving (const char *src_filename, const char *dest_filename);
+