tcp_seq.h

VRTX 商用嵌入式实时操作系统

/***************************************************************************
*
*               Copyright (c) 1993 READY SYSTEMS CORPORATION.
*
*       All rights reserved. READY SYSTEMS' source code is an unpublished
*       work and the use of a copyright notice does not imply otherwise.
*       This source code contains confidential, trade secret material of
*       READY SYSTEMS. Any attempt or participation in deciphering, decoding,
*       reverse engineering or in any way altering the source code is
*       strictly prohibited, unless the prior written consent of
*       READY SYSTEMS is obtained.
*
*
*       Module Name:            %M%
*
*       Identification:         %Z% %I% %M%
*
*       Date:                   %G%  %U%
*
****************************************************************************
*/

/*
 RCS header identifier - $Id: tcp_seq.h,v 1.4 1993/10/05 18:08:50 robert Exp $
*/
/*
 * Copyrighted as an unpublished work.
 * (c) Copyright 1987-1993 Lachman Technology, Incorporated
 * All rights reserved.
 * 
 * RESTRICTED RIGHTS
 * 
 * These programs are supplied under a license.  They may be used,
 * disclosed, and/or copied only as permitted under such license
 * agreement.  Any copy must contain the above copyright notice and
 * this restricted rights notice.  Use, copying, and/or disclosure
 * of the programs is strictly prohibited unless otherwise provided
 * in the license agreement.
 */
/*
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef tcp_seq_h
#define tcp_seq_h

#ifdef __cplusplus
extern "C" {
#endif

/* tcp_seq.h	6.1	83/07/29	 */

/*
 * TCP sequence numbers are 32 bit integers operated on with modular
 * arithmetic.  These macros can be used to compare such integers. 
 */
#ifdef vax
#define	SEQ_LT(a,b)	((int)((a)-(b)) < 0)
#define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
#define	SEQ_GT(a,b)	((int)((a)-(b)) > 0)
#define	SEQ_GEQ(a,b)	((int)((a)-(b)) >= 0)
#else
#define	SEQ_LT(a,b)	(((a)-(b))&0x80000000)
#define	SEQ_LEQ(a,b)	(!SEQ_GT(a,b))
#define	SEQ_GT(a,b)	SEQ_LT(b,a)
#define	SEQ_GEQ(a,b)	(!SEQ_LT(a,b))
#endif

/*
 * Macros to initialize tcp sequence numbers for send and receive from
 * initial send and receive sequence numbers. 
 */
#define	tcp_rcvseqinit(tp) \
	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1

#define	tcp_sendseqinit(tp) \
	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
	    (tp)->iss

#define	TCP_ISSINCR	(125*1024)	/* increment for tcp_iss each second */

#ifdef KERNEL
extern tcp_seq         tcp_iss;	/* tcp initial send seq # */
#endif

#ifdef __cplusplus
}
#endif

#endif				/* tcp_seq_h */