diff --git a/sys/files.h b/sys/files.h
new file mode 100644
index 0000000..3d7e2c8
--- /dev/null
+++ b/sys/files.h
@@ -0,0 +1,29 @@
+#ifndef LPC_FILES_H_
+#define LPC_FILES_H_ 1
+
+/* Definitions and macros for the various file efuns */
+
+/* Special return values of file_size() and the size part of get_dir().
+ */
+
+#define FSIZE_NOFILE  -1  /* File doesn't exist or is not readable */
+#define FSIZE_DIR     -2  /* The file is actually a directory */
+
+
+/* Flag values for get_dir().
+ */
+
+#define GETDIR_EMPTY       (0)  /* return an empty array (not very useful) */
+#define GETDIR_NAMES     (0x01)  /* return the filenames */
+#define GETDIR_SIZES     (0x02)  /* return the file sizes */
+#define GETDIR_DATES     (0x04)  /* return the dates of last modification */
+/*                       (0x08) unused */
+#define GETDIR_ACCESS    (0x40)  /* return the dates of last access */
+#define GETDIR_MODES     (0x80)  /* return the file mode */
+
+#define GETDIR_PATH      (0x10)  /* with _NAMES: add the path to the filenames */
+#define GETDIR_UNSORTED  (0x20)  /* return the results unsorted */
+
+#define GETDIR_ALL       (0xDF)  /* return all */
+
+#endif /* LPC_FILES_H_ */