/* TCP_SEQ.H

 * 

 * Portions copyright (c) 1997-1999 Symbian Ltd.  All rights reserved.

 */

/*

 * Copyright (c) 1982, 1986 Regents of the University of California.

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

/** @file

@publishedAll

@released

*/

#ifndef	_NETINET_TCP_SEQ_H

#define	_NETINET_TCP_SEQ_H

#ifdef	__cplusplus

extern "C" {

#endif

/**

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	__cplusplus

}

#endif

#endif	/* _NETINET_TCP_SEQ_H */