www.pudn.com > Nwpro.rar > TCP_SEQ.H, change:2003-02-25,size:2714b

/* 
 * Copyright (c) 1982, 1986, 1993 
 *	The Regents of the University of California.  All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. All advertising materials mentioning features or use of this software 
 *    must display the following acknowledgement: 
 *	This product includes software developed by the University of 
 *	California, Berkeley and its contributors. 
 * 4. Neither the name of the University nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 * 
 *	@(#)tcp_seq.h	8.1 (Berkeley) 6/10/93 
 */ 
 
/* 
 * TCP sequence numbers are 32 bit integers operated 
 * on with modular arithmetic.  These macros can be 
 * used to compare such integers. 
 */ 
#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) 
 
/* 
 * 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 
tcp_seq	tcp_iss;		/* tcp initial send seq # */ 
#endif