taglinefilesource code
ONLCR1786drivers/char/tty_io.ctty_std_termios.c_oflag = OPOST | ONLCR;
ONLCR229drivers/char/tty_ioctl.cif (tty->termios->c_oflag & ONLCR)
ONLCR264drivers/char/tty_ioctl.ctermios->c_oflag |= OPOST | ONLCR;
ONLCR145include/linux/tty.h#define O_ONLCR(tty)  _O_FLAG((tty),ONLCR)