HelenOS sources

SLIP_ESC          147 uspace/srv/net/slip/slip.c 			write_buffered(chardev, SLIP_ESC);
SLIP_ESC          150 uspace/srv/net/slip/slip.c 		case SLIP_ESC:
SLIP_ESC          151 uspace/srv/net/slip/slip.c 			write_buffered(chardev, SLIP_ESC);
SLIP_ESC          256 uspace/srv/net/slip/slip.c 			case SLIP_ESC:
SLIP_ESC          262 uspace/srv/net/slip/slip.c 					recv_final[sdu.size++] = SLIP_ESC;