#define O_DIRECTORY 0200000 /* must be a directory */
#define O_NOFOLLOW 0400000 /* don't follow links */
#define O_NOATIME 01000000
-#define O_ATOMICLOOKUP 02000000 /* do atomic file lookup */
#define F_DUPFD 0 /* dup */
#define F_GETFD 1 /* get close_on_exec */