1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Steven McCanne of Lawrence Berkeley Laboratory. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)remote-sl.h 8.1 (Berkeley) 06/10/93 11 * 12 * $Header: remote-sl.h,v 1.2 92/07/23 19:38:20 mccanne Exp $ (LBL) 13 */ 14 15 #define FRAME_START 0xc1 /* Frame End */ 16 #define FRAME_END 0xc0 /* Frame End */ 17 #define FRAME_ESCAPE 0xdb /* Frame Esc */ 18 #define TRANS_FRAME_START 0xde /* transposed frame start */ 19 #define TRANS_FRAME_END 0xdc /* transposed frame esc */ 20 #define TRANS_FRAME_ESCAPE 0xdd /* transposed frame esc */ 21 22 /* 23 * Message limits. SL_MAXDATA is the maximum number of bytes that can 24 * be read or written. SL_RPCSIZE is the maximum message size for 25 * the serial link. The actual MTU is two times the max message (since 26 * each byte might be escaped), plus the two framing bytes. We add two 27 * to the message length to account for the type byte and checksum. 28 */ 29 #define SL_MAXDATA 62 /* max data that can be read */ 30 #define SL_RPCSIZE (1 + SL_MAXDATA) /* errno byte + data */ 31 #define SL_MTU ((2 * (SL_RPCSIZE + 2) + 2)) 32 33