Commit | Line | Data |
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d0aeaf5a DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
f9ac90b4 KB |
3 | * All rights reserved. |
4 | * | |
cb956e54 | 5 | * %sccs.include.redist.c% |
d0aeaf5a DF |
6 | */ |
7 | ||
963ce42e | 8 | #ifndef lint |
cb956e54 | 9 | static char sccsid[] = "@(#)ctl_transact.c 5.7 (Berkeley) %G%"; |
f9ac90b4 | 10 | #endif /* not lint */ |
963ce42e | 11 | |
0328946e MK |
12 | #include "talk_ctl.h" |
13 | #include <sys/time.h> | |
14 | ||
963ce42e | 15 | #define CTL_WAIT 2 /* time to wait for a response, in seconds */ |
0328946e | 16 | |
963ce42e MK |
17 | /* |
18 | * SOCKDGRAM is unreliable, so we must repeat messages if we have | |
19 | * not recieved an acknowledgement within a reasonable amount | |
20 | * of time | |
21 | */ | |
4fa2ac2d | 22 | ctl_transact(target, msg, type, rp) |
963ce42e MK |
23 | struct in_addr target; |
24 | CTL_MSG msg; | |
25 | int type; | |
4fa2ac2d | 26 | CTL_RESPONSE *rp; |
0328946e | 27 | { |
4fa2ac2d | 28 | int read_mask, ctl_mask, nready, cc; |
963ce42e MK |
29 | struct timeval wait; |
30 | ||
963ce42e MK |
31 | msg.type = type; |
32 | daemon_addr.sin_addr = target; | |
33 | daemon_addr.sin_port = daemon_port; | |
34 | ctl_mask = 1 << ctl_sockt; | |
0328946e MK |
35 | |
36 | /* | |
4fa2ac2d KM |
37 | * Keep sending the message until a response of |
38 | * the proper type is obtained. | |
0328946e | 39 | */ |
0328946e | 40 | do { |
3f3b4df0 JB |
41 | wait.tv_sec = CTL_WAIT; |
42 | wait.tv_usec = 0; | |
4fa2ac2d | 43 | /* resend message until a response is obtained */ |
963ce42e | 44 | do { |
4fa2ac2d KM |
45 | cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, |
46 | &daemon_addr, sizeof (daemon_addr)); | |
47 | if (cc != sizeof (msg)) { | |
963ce42e MK |
48 | if (errno == EINTR) |
49 | continue; | |
50 | p_error("Error on write to talk daemon"); | |
51 | } | |
52 | read_mask = ctl_mask; | |
4fa2ac2d KM |
53 | nready = select(32, &read_mask, 0, 0, &wait); |
54 | if (nready < 0) { | |
963ce42e MK |
55 | if (errno == EINTR) |
56 | continue; | |
57 | p_error("Error waiting for daemon response"); | |
58 | } | |
59 | } while (nready == 0); | |
4fa2ac2d KM |
60 | /* |
61 | * Keep reading while there are queued messages | |
62 | * (this is not necessary, it just saves extra | |
63 | * request/acknowledgements being sent) | |
963ce42e MK |
64 | */ |
65 | do { | |
4fa2ac2d | 66 | cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); |
963ce42e MK |
67 | if (cc < 0) { |
68 | if (errno == EINTR) | |
69 | continue; | |
70 | p_error("Error on read from talk daemon"); | |
71 | } | |
72 | read_mask = ctl_mask; | |
73 | /* an immediate poll */ | |
74 | timerclear(&wait); | |
75 | nready = select(32, &read_mask, 0, 0, &wait); | |
4fa2ac2d KM |
76 | } while (nready > 0 && (rp->vers != TALK_VERSION || |
77 | rp->type != type)); | |
78 | } while (rp->vers != TALK_VERSION || rp->type != type); | |
79 | rp->id_num = ntohl(rp->id_num); | |
80 | rp->addr.sa_family = ntohs(rp->addr.sa_family); | |
0328946e | 81 | } |