OCRNL
termios
OFDEL
termios
OFILL
termios
ONLCR
termios
ONLRET
termios
ONOCR
termios
OPOST
termios
O_ACCMODE
fcntl
O_APPEND
fcntl
O_CREAT
fcntl
O_EXCL
fcntl
O_NOCTTY
fcntl
O_NONBLOCK
fcntl
O_RDONLY
fcntl
O_RDWR
fcntl
O_SYNC
fcntl
O_TRUNC
fcntl
O_WRONLY
fcntl
Ordered
scala
Ordering
scala
off_t
types
unistd
open
fcntl
opendir
dirent
openlog
syslog
optarg
getopt
opterr
getopt
optind
getopt
optopt
getopt