#define O_DIRECTORY 0x10000 /* must be a directory */
#define O_NOFOLLOW 0x20000 /* don't follow links */
#define O_LARGEFILE 0x40000
-#define O_ATOMICLOOKUP 0x80000 /* do atomic file lookup */
#define O_DIRECT 0x100000 /* direct disk access hint */
#define O_NOATIME 0x200000