#unconditional
O_CREAT
O_EXCL
O_NOCTTY
O_TRUNC
O_APPEND
O_NONBLOCK
/* O_SYNC should be listed before O_DSYNC and __O_SYNC */
O_SYNC
__O_SYNC
O_DSYNC
O_DIRECT
O_LARGEFILE
O_NOFOLLOW
O_NOATIME
O_CLOEXEC
O_PATH
/* O_TMPFILE should be listed before O_DIRECTORY and __O_TMPFILE */
O_TMPFILE
__O_TMPFILE
O_DIRECTORY
FASYNC