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
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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
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36 static char sccsid[] = "@(#)acksend.c 8.1 (Berkeley) 6/6/93";
38 static const char rcsid[] =
46 extern u_short sequence;
52 struct sockaddr_in *addr;
54 static struct tsp msg;
58 msg.tsp_vers = TSPVERSION;
59 (void)strcpy(msg.tsp_name, hostname);
61 if (sendto(sock, (char *)&msg, sizeof(struct tsp), 0,
62 (struct sockaddr*)addr, sizeof(struct sockaddr)) < 0) {
63 trace_sendto_err(addr->sin_addr);
69 * Acksend implements reliable datagram transmission by using sequence
70 * numbers and retransmission when necessary.
71 * If `name' is ANYADDR, this routine implements reliable broadcast.
73 * Because this function calls readmsg(), none of its args may be in
74 * a message provided by readmsg().
77 acksend(message, addr, name, ack, net, bad)
78 struct tsp *message; /* this message */
79 struct sockaddr_in *addr; /* to here */
81 int ack; /* look for this ack */
82 struct netinfo *net; /* receive from this network */
83 int bad; /* 1=losing patience */
89 message->tsp_vers = TSPVERSION;
90 message->tsp_seq = sequence;
92 fprintf(fd, "acksend: to %s: ",
93 (name == ANYADDR ? "broadcast" : name));
96 bytenetorder(message);
99 count = bad ? 1 : 5; /* 5 packets in 6.4 seconds */
103 /* do not go crazy transmitting just because the
104 * other guy cannot keep our sequence numbers
107 if (sendto(sock, (char *)message, sizeof(struct tsp),
108 0, (struct sockaddr*)addr,
109 sizeof(struct sockaddr)) < 0) {
110 trace_sendto_err(addr->sin_addr);
115 mstotvround(&twait, msec);
116 answer = readmsg(ack, name, &twait, net);
118 if (answer->tsp_seq != sequence) {
120 fprintf(fd,"acksend: seq # %u!=%u\n",
121 answer->tsp_seq, sequence);
128 } while (--count > 0);