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 * 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.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 static const char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93";
38 #include <arpa/inet.h>
45 #define CTL_WAIT 2 /* time to wait for a response, in seconds */
48 * SOCKDGRAM is unreliable, so we must repeat messages if we have
49 * not received an acknowledgement within a reasonable amount
53 ctl_transact(struct in_addr target, CTL_MSG lmsg, int type, CTL_RESPONSE *rp)
55 fd_set read_mask, ctl_mask;
60 daemon_addr.sin_addr = target;
61 daemon_addr.sin_port = daemon_port;
63 FD_SET(ctl_sockt, &ctl_mask);
66 * Keep sending the message until a response of
67 * the proper type is obtained.
70 wait.tv_sec = CTL_WAIT;
72 /* resend message until a response is obtained */
74 cc = sendto(ctl_sockt, (char *)&lmsg, sizeof (lmsg), 0,
75 (struct sockaddr *)&daemon_addr,
76 sizeof (daemon_addr));
77 if (cc != sizeof (lmsg)) {
80 p_error("Error on write to talk daemon");
83 nready = select(32, &read_mask, 0, 0, &wait);
87 p_error("Error waiting for daemon response");
89 } while (nready == 0);
91 * Keep reading while there are queued messages
92 * (this is not necessary, it just saves extra
93 * request/acknowledgements being sent)
96 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
100 p_error("Error on read from talk daemon");
102 read_mask = ctl_mask;
103 /* an immediate poll */
105 nready = select(32, &read_mask, 0, 0, &wait);
106 } while (nready > 0 && (rp->vers != TALK_VERSION ||
108 } while (rp->vers != TALK_VERSION || rp->type != type);
109 rp->id_num = ntohl(rp->id_num);
110 rp->addr.sa_family = ntohs(rp->addr.sa_family);