Root/
Source at commit 1445 created 12 years 11 months ago. By jrcs, Revert "Print the multiboot_magic" Only used for debugging purpose | |
---|---|
1 | /*␊ |
2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.␊ |
3 | *␊ |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@␊ |
5 | * ␊ |
6 | * This file contains Original Code and/or Modifications of Original Code␊ |
7 | * as defined in and that are subject to the Apple Public Source License␊ |
8 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
9 | * compliance with the License. The rights granted to you under the License␊ |
10 | * may not be used to create, or enable the creation or redistribution of,␊ |
11 | * unlawful or unlicensed copies of an Apple operating system, or to␊ |
12 | * circumvent, violate, or enable the circumvention or violation of, any␊ |
13 | * terms of an Apple operating system software license agreement.␊ |
14 | * ␊ |
15 | * Please obtain a copy of the License at␊ |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file.␊ |
17 | * ␊ |
18 | * The Original Code and all software distributed under the License are␊ |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
23 | * Please see the License for the specific language governing rights and␊ |
24 | * limitations under the License.␊ |
25 | * ␊ |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@␊ |
27 | */␊ |
28 | /*␊ |
29 | * Copyright (c) 1982, 1986, 1993␊ |
30 | *␉The Regents of the University of California. All rights reserved.␊ |
31 | *␊ |
32 | * Redistribution and use in source and binary forms, with or without␊ |
33 | * modification, are permitted provided that the following conditions␊ |
34 | * are met:␊ |
35 | * 1. Redistributions of source code must retain the above copyright␊ |
36 | * notice, this list of conditions and the following disclaimer.␊ |
37 | * 2. Redistributions in binary form must reproduce the above copyright␊ |
38 | * notice, this list of conditions and the following disclaimer in the␊ |
39 | * documentation and/or other materials provided with the distribution.␊ |
40 | * 3. All advertising materials mentioning features or use of this software␊ |
41 | * must display the following acknowledgement:␊ |
42 | *␉This product includes software developed by the University of␊ |
43 | *␉California, Berkeley and its contributors.␊ |
44 | * 4. Neither the name of the University nor the names of its contributors␊ |
45 | * may be used to endorse or promote products derived from this software␊ |
46 | * without specific prior written permission.␊ |
47 | *␊ |
48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␊ |
49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␊ |
50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␊ |
51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␊ |
52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␊ |
53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␊ |
54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␊ |
55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␊ |
56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␊ |
57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␊ |
58 | * SUCH DAMAGE.␊ |
59 | *␊ |
60 | *␉@(#)tcp_timer.h␉8.1 (Berkeley) 6/10/93␊ |
61 | * $FreeBSD: src/sys/netinet/tcp_timer.h,v 1.18 1999/12/29 04:41:03 peter Exp $␊ |
62 | */␊ |
63 | ␊ |
64 | #ifndef _NETINET_TCP_TIMER_H_␊ |
65 | #define _NETINET_TCP_TIMER_H_␊ |
66 | #include <sys/appleapiopts.h>␊ |
67 | ␊ |
68 | /*␊ |
69 | * Definitions of the TCP timers. These timers are counted␊ |
70 | * down PR_SLOWHZ times a second.␊ |
71 | */␊ |
72 | #define␉TCPT_NTIMERS␉4␊ |
73 | ␊ |
74 | #define␉TCPT_REXMT␉0␉␉/* retransmit */␊ |
75 | #define␉TCPT_PERSIST␉1␉␉/* retransmit persistence */␊ |
76 | #define␉TCPT_KEEP␉2␉␉/* keep alive */␊ |
77 | #define␉TCPT_2MSL␉3␉␉/* 2*msl quiet time timer */␊ |
78 | ␊ |
79 | /*␊ |
80 | * The TCPT_REXMT timer is used to force retransmissions.␊ |
81 | * The TCP has the TCPT_REXMT timer set whenever segments␊ |
82 | * have been sent for which ACKs are expected but not yet␊ |
83 | * received. If an ACK is received which advances tp->snd_una,␊ |
84 | * then the retransmit timer is cleared (if there are no more␊ |
85 | * outstanding segments) or reset to the base value (if there␊ |
86 | * are more ACKs expected). Whenever the retransmit timer goes off,␊ |
87 | * we retransmit one unacknowledged segment, and do a backoff␊ |
88 | * on the retransmit timer.␊ |
89 | *␊ |
90 | * The TCPT_PERSIST timer is used to keep window size information␊ |
91 | * flowing even if the window goes shut. If all previous transmissions␊ |
92 | * have been acknowledged (so that there are no retransmissions in progress),␊ |
93 | * and the window is too small to bother sending anything, then we start␊ |
94 | * the TCPT_PERSIST timer. When it expires, if the window is nonzero,␊ |
95 | * we go to transmit state. Otherwise, at intervals send a single byte␊ |
96 | * into the peer's window to force him to update our window information.␊ |
97 | * We do this at most as often as TCPT_PERSMIN time intervals,␊ |
98 | * but no more frequently than the current estimate of round-trip␊ |
99 | * packet time. The TCPT_PERSIST timer is cleared whenever we receive␊ |
100 | * a window update from the peer.␊ |
101 | *␊ |
102 | * The TCPT_KEEP timer is used to keep connections alive. If an␊ |
103 | * connection is idle (no segments received) for TCPTV_KEEP_INIT amount of time,␊ |
104 | * but not yet established, then we drop the connection. Once the connection␊ |
105 | * is established, if the connection is idle for TCPTV_KEEP_IDLE time␊ |
106 | * (and keepalives have been enabled on the socket), we begin to probe␊ |
107 | * the connection. We force the peer to send us a segment by sending:␊ |
108 | *␉<SEQ=SND.UNA-1><ACK=RCV.NXT><CTL=ACK>␊ |
109 | * This segment is (deliberately) outside the window, and should elicit␊ |
110 | * an ack segment in response from the peer. If, despite the TCPT_KEEP␊ |
111 | * initiated segments we cannot elicit a response from a peer in TCPT_MAXIDLE␊ |
112 | * amount of time probing, then we drop the connection.␊ |
113 | */␊ |
114 | ␊ |
115 | #endif /* !_NETINET_TCP_TIMER_H_ */␊ |
116 | ␊ |
117 |