clang: Suppress 'argument unused during compilation' warnings.
[dragonfly.git] / usr.bin / talk / look_up.c
blobfae780d6596addccaa9cc87fe35966f969a63bfb
1 /*
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
7 * are met:
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
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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
31 * SUCH DAMAGE.
33 * @(#)look_up.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/talk/look_up.c,v 1.5 1999/08/28 01:06:14 peter Exp $
35 * $DragonFly: src/usr.bin/talk/look_up.c,v 1.5 2008/10/16 01:52:33 swildner Exp $
38 #include <sys/param.h>
39 #include <sys/socket.h>
40 #include <protocols/talkd.h>
41 #include <errno.h>
42 #include "talk_ctl.h"
43 #include "talk.h"
46 * See if the local daemon has an invitation for us.
48 int
49 check_local(void)
51 CTL_RESPONSE response;
52 CTL_RESPONSE *rp = &response;
54 /* the rest of msg was set up in get_names */
55 #ifdef MSG_EOR
56 /* copy new style sockaddr to old, swap family (short in old) */
57 msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
58 msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
59 #else
60 msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
61 #endif
62 /* must be initiating a talk */
63 if (!look_for_invite(rp))
64 return (0);
66 * There was an invitation waiting for us,
67 * so connect with the other (hopefully waiting) party
69 current_state = "Waiting to connect with caller";
70 do {
71 if (rp->addr.sa_family != AF_INET)
72 p_error("Response uses invalid network address");
73 errno = 0;
74 if (connect(sockt,
75 (struct sockaddr *)&rp->addr, sizeof (rp->addr)) != -1)
76 return (1);
77 } while (errno == EINTR);
78 if (errno == ECONNREFUSED) {
80 * The caller gave up, but his invitation somehow
81 * was not cleared. Clear it and initiate an
82 * invitation. (We know there are no newer invitations,
83 * the talkd works LIFO.)
85 ctl_transact(his_machine_addr, msg, DELETE, rp);
86 close(sockt);
87 open_sockt();
88 return (0);
90 p_error("Unable to connect with initiator");
91 /*NOTREACHED*/
92 return (0);
96 * Look for an invitation on 'machine'
98 int
99 look_for_invite(CTL_RESPONSE *rp)
101 struct in_addr machine_addr;
103 current_state = "Checking for invitation on caller's machine";
104 ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
105 /* the switch is for later options, such as multiple invitations */
106 switch (rp->answer) {
108 case SUCCESS:
109 msg.id_num = htonl(rp->id_num);
110 return (1);
112 default:
113 /* there wasn't an invitation waiting for us */
114 return (0);