pppread            73 kern/tty_conf.c int	pppread(struct tty *tp, struct uio *uio, int flag);
pppread           123 kern/tty_conf.c 	{ pppopen, pppclose, pppread, pppwrite, ppptioctl,
pppread           131 net/ppp_tty.c  int	pppread(struct tty *tp, struct uio *uio, int flag);