2 * Copyright (c) 1983, 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
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34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 static const char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93";
42 #include <arpa/inet.h>
50 #define CTL_WAIT 2 /* time to wait for a response, in seconds */
53 * SOCKDGRAM is unreliable, so we must repeat messages if we have
54 * not recieved an acknowledgement within a reasonable amount
58 ctl_transact(struct in_addr target, CTL_MSG lmsg, int type, CTL_RESPONSE *rp)
60 fd_set read_mask, ctl_mask;
65 daemon_addr.sin_addr = target;
66 daemon_addr.sin_port = daemon_port;
68 FD_SET(ctl_sockt, &ctl_mask);
71 * Keep sending the message until a response of
72 * the proper type is obtained.
75 wait.tv_sec = CTL_WAIT;
77 /* resend message until a response is obtained */
79 cc = sendto(ctl_sockt, (char *)&lmsg, sizeof (lmsg), 0,
80 (struct sockaddr *)&daemon_addr,
81 sizeof (daemon_addr));
82 if (cc != sizeof (lmsg)) {
85 p_error("Error on write to talk daemon");
88 nready = select(32, &read_mask, 0, 0, &wait);
92 p_error("Error waiting for daemon response");
94 } while (nready == 0);
96 * Keep reading while there are queued messages
97 * (this is not necessary, it just saves extra
98 * request/acknowledgements being sent)
101 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
105 p_error("Error on read from talk daemon");
107 read_mask = ctl_mask;
108 /* an immediate poll */
110 nready = select(32, &read_mask, 0, 0, &wait);
111 } while (nready > 0 && (rp->vers != TALK_VERSION ||
113 } while (rp->vers != TALK_VERSION || rp->type != type);
114 rp->id_num = ntohl(rp->id_num);
115 rp->addr.sa_family = ntohs(rp->addr.sa_family);