O_DSYNC
#define O_DSYNC 040000 /* used to be O_SYNC, see below */
#define O_DSYNC 0x0010 /* used to be O_SYNC, see below */
#define O_DSYNC 001000000
#define O_DSYNC 0x2000 /* used to be O_SYNC, see below */
#define O_DSYNC 00010000 /* used to be O_SYNC, see below */