1 /* 2 * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)sp.h 7.3 (Berkeley) 06/29/88 18 */ 19 20 /* 21 * Definitions for Xerox NS style sequenced packet protocol 22 */ 23 24 struct sphdr { 25 u_char sp_cc; /* connection control */ 26 u_char sp_dt; /* datastream type */ 27 #define SP_SP 0x80 /* system packet */ 28 #define SP_SA 0x40 /* send acknowledgement */ 29 #define SP_OB 0x20 /* attention (out of band data) */ 30 #define SP_EM 0x10 /* end of message */ 31 u_short sp_sid; /* source connection identifier */ 32 u_short sp_did; /* destination connection identifier */ 33 u_short sp_seq; /* sequence number */ 34 u_short sp_ack; /* acknowledge number */ 35 u_short sp_alo; /* allocation number */ 36 }; 37