Annotation of src/usr.bin/talk/ctl_transact.c, Revision 1.3
1.3 ! deraadt 1: /* $OpenBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $ */
1.1 deraadt 2: /* $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93";
40: #endif
1.3 ! deraadt 41: static char rcsid[] = "$OpenBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $";
1.1 deraadt 42: #endif /* not lint */
43:
44: #include <sys/types.h>
45: #include <sys/socket.h>
46: #include <sys/time.h>
47: #include <netinet/in.h>
48: #include <protocols/talkd.h>
49: #include <errno.h>
50: #include "talk_ctl.h"
51:
52: #define CTL_WAIT 2 /* time to wait for a response, in seconds */
53:
54: /*
55: * SOCKDGRAM is unreliable, so we must repeat messages if we have
56: * not recieved an acknowledgement within a reasonable amount
57: * of time
58: */
59: ctl_transact(target, msg, type, rp)
60: struct in_addr target;
61: CTL_MSG msg;
62: int type;
63: CTL_RESPONSE *rp;
64: {
65: int read_mask, ctl_mask, nready, cc;
66: struct timeval wait;
67:
68: msg.type = type;
69: daemon_addr.sin_addr = target;
70: daemon_addr.sin_port = daemon_port;
71: ctl_mask = 1 << ctl_sockt;
72:
73: /*
74: * Keep sending the message until a response of
75: * the proper type is obtained.
76: */
77: do {
78: wait.tv_sec = CTL_WAIT;
79: wait.tv_usec = 0;
80: /* resend message until a response is obtained */
81: do {
82: cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
83: (struct sockaddr *)&daemon_addr,
84: sizeof (daemon_addr));
85: if (cc != sizeof (msg)) {
86: if (errno == EINTR)
87: continue;
88: p_error("Error on write to talk daemon");
89: }
90: read_mask = ctl_mask;
91: nready = select(32, &read_mask, 0, 0, &wait);
92: if (nready < 0) {
93: if (errno == EINTR)
94: continue;
95: p_error("Error waiting for daemon response");
96: }
97: } while (nready == 0);
98: /*
99: * Keep reading while there are queued messages
100: * (this is not necessary, it just saves extra
101: * request/acknowledgements being sent)
102: */
103: do {
104: cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
105: if (cc < 0) {
106: if (errno == EINTR)
107: continue;
108: p_error("Error on read from talk daemon");
109: }
110: read_mask = ctl_mask;
111: /* an immediate poll */
112: timerclear(&wait);
113: nready = select(32, &read_mask, 0, 0, &wait);
114: } while (nready > 0 && (rp->vers != TALK_VERSION ||
115: rp->type != type));
116: } while (rp->vers != TALK_VERSION || rp->type != type);
117: rp->id_num = ntohl(rp->id_num);
118: }