2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)acksend.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.sbin/timed/timed/acksend.c,v 1.4 1999/08/28 01:20:16 peter Exp $
41 extern u_short sequence;
44 xmit(int type, u_int seq, struct sockaddr_in *addr)
46 static struct tsp msg;
50 msg.tsp_vers = TSPVERSION;
51 strlcpy(msg.tsp_name, hostname, sizeof(msg.tsp_name));
53 if (sendto(sock, (char *)&msg, sizeof(struct tsp), 0,
54 (struct sockaddr*)addr, sizeof(struct sockaddr)) < 0) {
55 trace_sendto_err(addr->sin_addr);
61 * Acksend implements reliable datagram transmission by using sequence
62 * numbers and retransmission when necessary.
63 * If `name' is ANYADDR, this routine implements reliable broadcast.
65 * Because this function calls readmsg(), none of its args may be in
66 * a message provided by readmsg().
69 acksend(struct tsp *message, /* this message */
70 struct sockaddr_in *addr, /* to here */
72 int ack, /* look for this ack */
73 struct netinfo *net, /* receive from this network */
74 int bad) /* 1=losing patience */
80 message->tsp_vers = TSPVERSION;
81 message->tsp_seq = sequence;
83 fprintf(fd, "acksend: to %s: ",
84 (name == ANYADDR ? "broadcast" : name));
87 bytenetorder(message);
90 count = bad ? 1 : 5; /* 5 packets in 6.4 seconds */
94 /* do not go crazy transmitting just because the
95 * other guy cannot keep our sequence numbers
98 if (sendto(sock, (char *)message, sizeof(struct tsp),
99 0, (struct sockaddr*)addr,
100 sizeof(struct sockaddr)) < 0) {
101 trace_sendto_err(addr->sin_addr);
106 mstotvround(&twait, msec);
107 answer = readmsg(ack, name, &twait, net);
108 if (answer != NULL) {
109 if (answer->tsp_seq != sequence) {
111 fprintf(fd,"acksend: seq # %u!=%u\n",
112 answer->tsp_seq, sequence);
119 } while (--count > 0);