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