projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| d0aeaf5a DF |
1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | */ | |
| 6 | ||
| 963ce42e | 7 | #ifndef lint |
| 4fa2ac2d | 8 | static char sccsid[] = "@(#)ctl_transact.c 5.2 (Berkeley) %G%"; |
| d0aeaf5a | 9 | #endif not lint |
| 963ce42e | 10 | |
| 0328946e MK |
11 | #include "talk_ctl.h" |
| 12 | #include <sys/time.h> | |
| 13 | ||
| 963ce42e | 14 | #define CTL_WAIT 2 /* time to wait for a response, in seconds */ |
| 0328946e | 15 | |
| 963ce42e MK |
16 | /* |
| 17 | * SOCKDGRAM is unreliable, so we must repeat messages if we have | |
| 18 | * not recieved an acknowledgement within a reasonable amount | |
| 19 | * of time | |
| 20 | */ | |
| 4fa2ac2d | 21 | ctl_transact(target, msg, type, rp) |
| 963ce42e MK |
22 | struct in_addr target; |
| 23 | CTL_MSG msg; | |
| 24 | int type; | |
| 4fa2ac2d | 25 | CTL_RESPONSE *rp; |
| 0328946e | 26 | { |
| 4fa2ac2d | 27 | int read_mask, ctl_mask, nready, cc; |
| 963ce42e MK |
28 | struct timeval wait; |
| 29 | ||
| 963ce42e MK |
30 | msg.type = type; |
| 31 | daemon_addr.sin_addr = target; | |
| 32 | daemon_addr.sin_port = daemon_port; | |
| 33 | ctl_mask = 1 << ctl_sockt; | |
| 0328946e MK |
34 | |
| 35 | /* | |
| 4fa2ac2d KM |
36 | * Keep sending the message until a response of |
| 37 | * the proper type is obtained. | |
| 0328946e | 38 | */ |
| 0328946e | 39 | do { |
| 3f3b4df0 JB |
40 | wait.tv_sec = CTL_WAIT; |
| 41 | wait.tv_usec = 0; | |
| 4fa2ac2d | 42 | /* resend message until a response is obtained */ |
| 963ce42e | 43 | do { |
| 4fa2ac2d KM |
44 | cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, |
| 45 | &daemon_addr, sizeof (daemon_addr)); | |
| 46 | if (cc != sizeof (msg)) { | |
| 963ce42e MK |
47 | if (errno == EINTR) |
| 48 | continue; | |
| 49 | p_error("Error on write to talk daemon"); | |
| 50 | } | |
| 51 | read_mask = ctl_mask; | |
| 4fa2ac2d KM |
52 | nready = select(32, &read_mask, 0, 0, &wait); |
| 53 | if (nready < 0) { | |
| 963ce42e MK |
54 | if (errno == EINTR) |
| 55 | continue; | |
| 56 | p_error("Error waiting for daemon response"); | |
| 57 | } | |
| 58 | } while (nready == 0); | |
| 4fa2ac2d KM |
59 | /* |
| 60 | * Keep reading while there are queued messages | |
| 61 | * (this is not necessary, it just saves extra | |
| 62 | * request/acknowledgements being sent) | |
| 963ce42e MK |
63 | */ |
| 64 | do { | |
| 4fa2ac2d | 65 | cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); |
| 963ce42e MK |
66 | if (cc < 0) { |
| 67 | if (errno == EINTR) | |
| 68 | continue; | |
| 69 | p_error("Error on read from talk daemon"); | |
| 70 | } | |
| 71 | read_mask = ctl_mask; | |
| 72 | /* an immediate poll */ | |
| 73 | timerclear(&wait); | |
| 74 | nready = select(32, &read_mask, 0, 0, &wait); | |
| 4fa2ac2d KM |
75 | } while (nready > 0 && (rp->vers != TALK_VERSION || |
| 76 | rp->type != type)); | |
| 77 | } while (rp->vers != TALK_VERSION || rp->type != type); | |
| 78 | rp->id_num = ntohl(rp->id_num); | |
| 79 | rp->addr.sa_family = ntohs(rp->addr.sa_family); | |
| 0328946e | 80 | } |