1 /* 2 * Copyright (c) 1982 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)sp.h 6.2 (Berkeley) 06/08/85 7 */ 8 9 /* 10 * Definitions for Xerox NS style sequenced packet protocol 11 */ 12 13 struct sphdr { 14 u_char sp_cc; /* connection control */ 15 u_char sp_dt; /* datastream type */ 16 #define SP_SP 0x80 /* system packet */ 17 #define SP_SA 0x40 /* send acknowledgement */ 18 #define SP_OB 0x20 /* attention (out of band data) */ 19 #define SP_EM 0x10 /* end of message */ 20 u_short sp_sid; /* source connection identifier */ 21 u_short sp_did; /* destination connection identifier */ 22 u_short sp_seq; /* sequence number */ 23 u_short sp_ack; /* acknowledge number */ 24 u_short sp_alo; /* allocation number */ 25 }; 26