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
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13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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32 static char sccsid[] = "@(#)acksend.c 8.1 (Berkeley) 6/6/93";
34 static const char rcsid[] =
42 extern u_short sequence;
48 struct sockaddr_in *addr;
50 static struct tsp msg;
54 msg.tsp_vers = TSPVERSION;
55 (void)strcpy(msg.tsp_name, hostname);
57 if (sendto(sock, (char *)&msg, sizeof(struct tsp), 0,
58 (struct sockaddr*)addr, sizeof(struct sockaddr)) < 0) {
59 trace_sendto_err(addr->sin_addr);
65 * Acksend implements reliable datagram transmission by using sequence
66 * numbers and retransmission when necessary.
67 * If `name' is ANYADDR, this routine implements reliable broadcast.
69 * Because this function calls readmsg(), none of its args may be in
70 * a message provided by readmsg().
73 acksend(message, addr, name, ack, net, bad)
74 struct tsp *message; /* this message */
75 struct sockaddr_in *addr; /* to here */
77 int ack; /* look for this ack */
78 struct netinfo *net; /* receive from this network */
79 int bad; /* 1=losing patience */
85 message->tsp_vers = TSPVERSION;
86 message->tsp_seq = sequence;
88 fprintf(fd, "acksend: to %s: ",
89 (name == ANYADDR ? "broadcast" : name));
92 bytenetorder(message);
95 count = bad ? 1 : 5; /* 5 packets in 6.4 seconds */
99 /* do not go crazy transmitting just because the
100 * other guy cannot keep our sequence numbers
103 if (sendto(sock, (char *)message, sizeof(struct tsp),
104 0, (struct sockaddr*)addr,
105 sizeof(struct sockaddr)) < 0) {
106 trace_sendto_err(addr->sin_addr);
111 mstotvround(&twait, msec);
112 answer = readmsg(ack, name, &twait, net);
114 if (answer->tsp_seq != sequence) {
116 fprintf(fd,"acksend: seq # %u!=%u\n",
117 answer->tsp_seq, sequence);
124 } while (--count > 0);