1 /* $OpenBSD: ctl_transact.c,v 1.5 1998/08/18 04:02:10 millert Exp $ */ 2 /* $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 static char rcsid[] = "$OpenBSD: ctl_transact.c,v 1.5 1998/08/18 04:02:10 millert Exp $"; 42 #endif /* not lint */ 43 44 #include "talk.h" 45 #include <sys/time.h> 46 #include <errno.h> 47 #include <unistd.h> 48 #include "talk_ctl.h" 49 50 #define CTL_WAIT 2 /* time to wait for a response, in seconds */ 51 52 /* 53 * SOCKDGRAM is unreliable, so we must repeat messages if we have 54 * not received an acknowledgement within a reasonable amount 55 * of time 56 */ 57 void 58 ctl_transact(target, msg, type, rp) 59 struct in_addr target; 60 CTL_MSG msg; 61 int type; 62 CTL_RESPONSE *rp; 63 { 64 fd_set read_mask, ctl_mask; 65 int nready, cc; 66 struct timeval wait; 67 68 msg.type = type; 69 daemon_addr.sin_addr = target; 70 daemon_addr.sin_port = daemon_port; 71 FD_ZERO(&ctl_mask); 72 FD_SET(ctl_sockt, &ctl_mask); 73 74 /* 75 * Keep sending the message until a response of 76 * the proper type is obtained. 77 */ 78 do { 79 wait.tv_sec = CTL_WAIT; 80 wait.tv_usec = 0; 81 /* resend message until a response is obtained */ 82 do { 83 cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, 84 (struct sockaddr *)&daemon_addr, 85 sizeof (daemon_addr)); 86 if (cc != sizeof (msg)) { 87 if (errno == EINTR) 88 continue; 89 p_error("Error on write to talk daemon"); 90 } 91 read_mask = ctl_mask; 92 nready = select(32, &read_mask, 0, 0, &wait); 93 if (nready < 0) { 94 if (errno == EINTR) 95 continue; 96 p_error("Error waiting for daemon response"); 97 } 98 } while (nready == 0); 99 /* 100 * Keep reading while there are queued messages 101 * (this is not necessary, it just saves extra 102 * request/acknowledgements being sent) 103 */ 104 do { 105 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 106 if (cc < 0) { 107 if (errno == EINTR) 108 continue; 109 p_error("Error on read from talk daemon"); 110 } 111 read_mask = ctl_mask; 112 /* an immediate poll */ 113 timerclear(&wait); 114 nready = select(32, &read_mask, 0, 0, &wait); 115 } while (nready > 0 && (rp->vers != TALK_VERSION || 116 rp->type != type)); 117 } while (rp->vers != TALK_VERSION || rp->type != type); 118 rp->id_num = ntohl(rp->id_num); 119 } 120