projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 984263bc MD |
1 | /* |
| 2 | * Copyright (c) 1983, 1993 | |
| 3 | * The Regents of the University of California. All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| dc71b7ab | 13 | * 3. Neither the name of the University nor the names of its contributors |
| 984263bc MD |
14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. | |
| 16 | * | |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 27 | * SUCH DAMAGE. | |
| 1de703da MD |
28 | * |
| 29 | * @(#)ctl_transact.c 8.1 (Berkeley) 6/6/93 | |
| 30 | * $FreeBSD: src/usr.bin/talk/ctl_transact.c,v 1.5 1999/08/28 01:06:11 peter Exp $ | |
| 984263bc MD |
31 | */ |
| 32 | ||
| 984263bc MD |
33 | #include <errno.h> |
| 34 | #include <string.h> | |
| 35 | #include "talk.h" | |
| 36 | #include "talk_ctl.h" | |
| 37 | ||
| 38 | #define CTL_WAIT 2 /* time to wait for a response, in seconds */ | |
| 39 | ||
| 40 | /* | |
| 41 | * SOCKDGRAM is unreliable, so we must repeat messages if we have | |
| 42 | * not recieved an acknowledgement within a reasonable amount | |
| 43 | * of time | |
| 44 | */ | |
| 45 | void | |
| e2daa382 | 46 | ctl_transact(struct in_addr target, CTL_MSG lmsg, int type, CTL_RESPONSE *rp) |
| 984263bc MD |
47 | { |
| 48 | fd_set read_mask, ctl_mask; | |
| 49 | int nready = 0, cc; | |
| 50 | struct timeval wait; | |
| 51 | ||
| e2daa382 | 52 | lmsg.type = type; |
| 984263bc MD |
53 | daemon_addr.sin_addr = target; |
| 54 | daemon_addr.sin_port = daemon_port; | |
| 55 | FD_ZERO(&ctl_mask); | |
| 56 | FD_SET(ctl_sockt, &ctl_mask); | |
| 57 | ||
| 58 | /* | |
| 59 | * Keep sending the message until a response of | |
| 60 | * the proper type is obtained. | |
| 61 | */ | |
| 62 | do { | |
| 63 | wait.tv_sec = CTL_WAIT; | |
| 64 | wait.tv_usec = 0; | |
| 65 | /* resend message until a response is obtained */ | |
| 66 | do { | |
| e2daa382 | 67 | cc = sendto(ctl_sockt, (char *)&lmsg, sizeof (lmsg), 0, |
| 984263bc MD |
68 | (struct sockaddr *)&daemon_addr, |
| 69 | sizeof (daemon_addr)); | |
| e2daa382 | 70 | if (cc != sizeof (lmsg)) { |
| 984263bc MD |
71 | if (errno == EINTR) |
| 72 | continue; | |
| 73 | p_error("Error on write to talk daemon"); | |
| 74 | } | |
| 75 | read_mask = ctl_mask; | |
| 76 | nready = select(32, &read_mask, 0, 0, &wait); | |
| 77 | if (nready < 0) { | |
| 78 | if (errno == EINTR) | |
| 79 | continue; | |
| 80 | p_error("Error waiting for daemon response"); | |
| 81 | } | |
| 82 | } while (nready == 0); | |
| 83 | /* | |
| 84 | * Keep reading while there are queued messages | |
| 85 | * (this is not necessary, it just saves extra | |
| 86 | * request/acknowledgements being sent) | |
| 87 | */ | |
| 88 | do { | |
| 89 | cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); | |
| 90 | if (cc < 0) { | |
| 91 | if (errno == EINTR) | |
| 92 | continue; | |
| 93 | p_error("Error on read from talk daemon"); | |
| 94 | } | |
| 95 | read_mask = ctl_mask; | |
| 96 | /* an immediate poll */ | |
| 97 | timerclear(&wait); | |
| 98 | nready = select(32, &read_mask, 0, 0, &wait); | |
| 99 | } while (nready > 0 && (rp->vers != TALK_VERSION || | |
| 100 | rp->type != type)); | |
| 101 | } while (rp->vers != TALK_VERSION || rp->type != type); | |
| 102 | rp->id_num = ntohl(rp->id_num); | |
| 103 | rp->addr.sa_family = ntohs(rp->addr.sa_family); | |
| 104 | } |