+#define O_RDONLY 0x0000 /* open for reading only */
+#define O_WRONLY 0x0001 /* open for writing only */
+#define O_RDWR 0x0002 /* open for reading and writing */
+#define O_APPEND 0x0008 /* writes done at eof */
+
+#define O_CREAT 0x0100 /* create and open file */
+#define O_TRUNC 0x0200 /* open and truncate */
+#define O_EXCL 0x0400 /* open only if file doesn't already exist */
+
+#define O_TEXT 0x4000 /* file mode is text (translated) */
+#define O_BINARY 0x8000 /* file mode is binary (untranslated) */
+