[F]
FD_CLOEXEC
FF0
FF1
FFDLY
FIRST_LDT_ENTRY
FIRST_TASK
FIRST_TSS_ENTRY
FLUSHO
FULL
F_DUPFD
F_GETFD
F_GETFL
F_GETLK
F_OK
F_RDLCK
F_SETFD
F_SETFL
F_SETLK
F_SETLKW
F_UNLCK
F_WRLCK