libutil: Prevent leaking slave fd on failed fork.
[dragonfly.git] / sys / netinet / tcp_seq.h
blob1f0ee429aec3716f39dd7f93c3f6054283c0031a
1 /*
2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
35 * Copyright (c) 1982, 1986, 1993, 1995
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
62 * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
63 * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.7 2003/02/03 02:33:10 hsu Exp $
64 * $DragonFly: src/sys/netinet/tcp_seq.h,v 1.10 2007/03/04 18:51:59 swildner Exp $
67 #ifndef _NETINET_TCP_SEQ_H_
68 #define _NETINET_TCP_SEQ_H_
70 #ifndef _NETINET_TCP_H_
71 #include <netinet/tcp.h>
72 #endif
75 * TCP sequence numbers are 32 bit integers operated
76 * on with modular arithmetic. These macros can be
77 * used to compare such integers.
79 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
80 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
81 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
82 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
84 static __inline tcp_seq
85 seq_max(tcp_seq a, tcp_seq b)
87 return (SEQ_GT(a, b) ? a : b);
90 static __inline tcp_seq
91 seq_min(tcp_seq a, tcp_seq b)
93 return (SEQ_LT(a, b) ? a : b);
96 /* for modulo comparisons of timestamps */
97 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
98 #define TSTMP_GT(a,b) ((int)((a)-(b)) > 0)
99 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
102 * Macros to initialize tcp sequence numbers for
103 * send and receive from initial send and receive
104 * sequence numbers.
106 #define tcp_rcvseqinit(tp) \
107 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
109 #define tcp_sendseqinit(tp) \
110 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
111 (tp)->snd_recover = (tp)->iss
113 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * hz)
114 /* timestamp wrap-around time */
116 #endif /* _NETINET_TCP_SEQ_H_ */