1 /* $NetBSD: ctl_transact.c,v 1.4 1997/10/20 00:23:16 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 __RCSID("$NetBSD: ctl_transact.c,v 1.4 1997/10/20 00:23:16 lukem 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 recieved 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 nready = 0; 69 msg.type = type; 70 daemon_addr.sin_addr = target; 71 daemon_addr.sin_port = daemon_port; 72 FD_ZERO(&ctl_mask); 73 FD_SET(ctl_sockt, &ctl_mask); 74 75 /* 76 * Keep sending the message until a response of 77 * the proper type is obtained. 78 */ 79 do { 80 wait.tv_sec = CTL_WAIT; 81 wait.tv_usec = 0; 82 /* resend message until a response is obtained */ 83 do { 84 cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, 85 (struct sockaddr *)&daemon_addr, 86 sizeof (daemon_addr)); 87 if (cc != sizeof (msg)) { 88 if (errno == EINTR) 89 continue; 90 p_error("Error on write to talk daemon"); 91 } 92 read_mask = ctl_mask; 93 nready = select(32, &read_mask, 0, 0, &wait); 94 if (nready < 0) { 95 if (errno == EINTR) 96 continue; 97 p_error("Error waiting for daemon response"); 98 } 99 } while (nready == 0); 100 /* 101 * Keep reading while there are queued messages 102 * (this is not necessary, it just saves extra 103 * request/acknowledgements being sent) 104 */ 105 do { 106 cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); 107 if (cc < 0) { 108 if (errno == EINTR) 109 continue; 110 p_error("Error on read from talk daemon"); 111 } 112 read_mask = ctl_mask; 113 /* an immediate poll */ 114 timerclear(&wait); 115 nready = select(32, &read_mask, 0, 0, &wait); 116 } while (nready > 0 && (rp->vers != TALK_VERSION || 117 rp->type != type)); 118 } while (rp->vers != TALK_VERSION || rp->type != type); 119 rp->id_num = ntohl(rp->id_num); 120 rp->addr.sa_family = ntohs(rp->addr.sa_family); 121 } 122