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Annotation of 43BSDTahoe/sys/netinet/tcp_seq.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  *
                     17:  *     @(#)tcp_seq.h   7.3 (Berkeley) 6/29/88
                     18:  */
                     19: 
                     20: /*
                     21:  * TCP sequence numbers are 32 bit integers operated
                     22:  * on with modular arithmetic.  These macros can be
                     23:  * used to compare such integers.
                     24:  */
                     25: #define        SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
                     26: #define        SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
                     27: #define        SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
                     28: #define        SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
                     29: 
                     30: /*
                     31:  * Macros to initialize tcp sequence numbers for
                     32:  * send and receive from initial send and receive
                     33:  * sequence numbers.
                     34:  */
                     35: #define        tcp_rcvseqinit(tp) \
                     36:        (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
                     37: 
                     38: #define        tcp_sendseqinit(tp) \
                     39:        (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
                     40:            (tp)->iss
                     41: 
                     42: #define        TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
                     43: 
                     44: #ifdef KERNEL
                     45: tcp_seq        tcp_iss;                /* tcp initial send seq # */
                     46: #endif

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