Commit | Line | Data |
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d0aeaf5a | 1 | /* |
725a8fbf KB |
2 | * Copyright (c) 1983, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
f9ac90b4 | 4 | * |
cb956e54 | 5 | * %sccs.include.redist.c% |
d0aeaf5a DF |
6 | */ |
7 | ||
963ce42e | 8 | #ifndef lint |
725a8fbf | 9 | static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) %G%"; |
f9ac90b4 | 10 | #endif /* not lint */ |
963ce42e | 11 | |
a4e94754 KB |
12 | #include <sys/types.h> |
13 | #include <sys/socket.h> | |
0328946e | 14 | #include <sys/time.h> |
a4e94754 KB |
15 | #include <netinet/in.h> |
16 | #include <protocols/talkd.h> | |
17 | #include <errno.h> | |
18 | #include "talk_ctl.h" | |
0328946e | 19 | |
963ce42e | 20 | #define CTL_WAIT 2 /* time to wait for a response, in seconds */ |
0328946e | 21 | |
963ce42e MK |
22 | /* |
23 | * SOCKDGRAM is unreliable, so we must repeat messages if we have | |
24 | * not recieved an acknowledgement within a reasonable amount | |
25 | * of time | |
26 | */ | |
4fa2ac2d | 27 | ctl_transact(target, msg, type, rp) |
963ce42e MK |
28 | struct in_addr target; |
29 | CTL_MSG msg; | |
30 | int type; | |
4fa2ac2d | 31 | CTL_RESPONSE *rp; |
0328946e | 32 | { |
4fa2ac2d | 33 | int read_mask, ctl_mask, nready, cc; |
963ce42e MK |
34 | struct timeval wait; |
35 | ||
963ce42e MK |
36 | msg.type = type; |
37 | daemon_addr.sin_addr = target; | |
38 | daemon_addr.sin_port = daemon_port; | |
39 | ctl_mask = 1 << ctl_sockt; | |
0328946e MK |
40 | |
41 | /* | |
4fa2ac2d KM |
42 | * Keep sending the message until a response of |
43 | * the proper type is obtained. | |
0328946e | 44 | */ |
0328946e | 45 | do { |
3f3b4df0 JB |
46 | wait.tv_sec = CTL_WAIT; |
47 | wait.tv_usec = 0; | |
4fa2ac2d | 48 | /* resend message until a response is obtained */ |
963ce42e | 49 | do { |
4fa2ac2d | 50 | cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, |
a4e94754 KB |
51 | (struct sockaddr *)&daemon_addr, |
52 | sizeof (daemon_addr)); | |
4fa2ac2d | 53 | if (cc != sizeof (msg)) { |
963ce42e MK |
54 | if (errno == EINTR) |
55 | continue; | |
56 | p_error("Error on write to talk daemon"); | |
57 | } | |
58 | read_mask = ctl_mask; | |
4fa2ac2d KM |
59 | nready = select(32, &read_mask, 0, 0, &wait); |
60 | if (nready < 0) { | |
963ce42e MK |
61 | if (errno == EINTR) |
62 | continue; | |
63 | p_error("Error waiting for daemon response"); | |
64 | } | |
65 | } while (nready == 0); | |
4fa2ac2d KM |
66 | /* |
67 | * Keep reading while there are queued messages | |
68 | * (this is not necessary, it just saves extra | |
69 | * request/acknowledgements being sent) | |
963ce42e MK |
70 | */ |
71 | do { | |
4fa2ac2d | 72 | cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); |
963ce42e MK |
73 | if (cc < 0) { |
74 | if (errno == EINTR) | |
75 | continue; | |
76 | p_error("Error on read from talk daemon"); | |
77 | } | |
78 | read_mask = ctl_mask; | |
79 | /* an immediate poll */ | |
80 | timerclear(&wait); | |
81 | nready = select(32, &read_mask, 0, 0, &wait); | |
4fa2ac2d KM |
82 | } while (nready > 0 && (rp->vers != TALK_VERSION || |
83 | rp->type != type)); | |
84 | } while (rp->vers != TALK_VERSION || rp->type != type); | |
85 | rp->id_num = ntohl(rp->id_num); | |
86 | rp->addr.sa_family = ntohs(rp->addr.sa_family); | |
0328946e | 87 | } |