text: /*
   * Copyright (c) 1984, 1985, 1986, 1987, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * %sccs.include.redist.c%
   *
   *	@(#)sp.h	8.1 (Berkeley) 06/10/93
   */
  
  /*
   * Definitions for Xerox NS style sequenced packet protocol
   */
  
  struct sphdr {
  	u_char	sp_cc;		/* connection control */
  	u_char	sp_dt;		/* datastream type */
  #define	SP_SP	0x80		/* system packet */
  #define	SP_SA	0x40		/* send acknowledgement */
  #define	SP_OB	0x20		/* attention (out of band data) */
  #define	SP_EM	0x10		/* end of message */
  	u_short	sp_sid;		/* source connection identifier */
  	u_short	sp_did;		/* destination connection identifier */
  	u_short	sp_seq;		/* sequence number */
  	u_short	sp_ack;		/* acknowledge number */
  	u_short	sp_alo;		/* allocation number */
  };
  