4.3BSD - /usr/src/sys/netinet/tcp_seq.h

   1: /*
   2:  * Copyright (c) 1982, 1986 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:  *	@(#)tcp_seq.h	7.1 (Berkeley) 6/5/86
   7:  */
   8: 
   9: /*
  10:  * TCP sequence numbers are 32 bit integers operated
  11:  * on with modular arithmetic.  These macros can be
  12:  * used to compare such integers.
  13:  */
  14: #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
  15: #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
  16: #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
  17: #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
  18: 
  19: /*
  20:  * Macros to initialize tcp sequence numbers for
  21:  * send and receive from initial send and receive
  22:  * sequence numbers.
  23:  */
  24: #define tcp_rcvseqinit(tp) \
  25:     (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
  26: 
  27: #define tcp_sendseqinit(tp) \
  28:     (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
  29:         (tp)->iss
  30: 
  31: #define TCP_ISSINCR (125*1024)  /* increment for tcp_iss each second */
  32: 
  33: #ifdef KERNEL
  34: tcp_seq tcp_iss;        /* tcp initial send seq # */
  35: #endif

Defined macros

Usage of this include