/* $NetBSD: ctl_transact.c,v 1.6 2003/06/11 12:00:22 wiz Exp $ */ /* * Copyright (c) 1983-2003, Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * + Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * + Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * + Neither the name of the University of California, San Francisco nor * the names of its contributors may be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "bsd.h" #if defined(TALK_43) || defined(TALK_42) #include #ifndef lint #if 0 static char sccsid[] = "@(#)ctl_transact.c 5.2 (Berkeley) 3/13/86"; #else __RCSID("$NetBSD: ctl_transact.c,v 1.6 2003/06/11 12:00:22 wiz Exp $"); #endif #endif /* not lint */ #include #include #include "hunt.h" #include "talk_ctl.h" #define CTL_WAIT 2 /* time to wait for a response, in seconds */ #define MAX_RETRY 5 /* * SOCKDGRAM is unreliable, so we must repeat messages if we have * not received an acknowledgement within a reasonable amount * of time */ void ctl_transact(target, msg, type, rp) struct in_addr target; CTL_MSG msg; int type; CTL_RESPONSE *rp; { struct pollfd set[1]; int nready, cc, retries; nready = 0; msg.type = type; daemon_addr.sin_addr = target; daemon_addr.sin_port = daemon_port; set[0].fd = ctl_sockt; set[0].events = POLLIN; /* * Keep sending the message until a response of * the proper type is obtained. */ do { /* resend message until a response is obtained */ for (retries = MAX_RETRY; retries > 0; retries -= 1) { cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, &daemon_addr, sizeof (daemon_addr)); if (cc != sizeof (msg)) { if (errno == EINTR) continue; p_error("Error on write to talk daemon"); } nready = poll(set, 1, CTL_WAIT * 1000); if (nready < 0) { if (errno == EINTR) continue; p_error("Error waiting for daemon response"); } if (nready != 0) break; } if (retries <= 0) break; /* * Keep reading while there are queued messages * (this is not necessary, it just saves extra * request/acknowledgements being sent) */ do { cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0); if (cc < 0) { if (errno == EINTR) continue; p_error("Error on read from talk daemon"); } /* an immediate poll */ nready = poll(set, 1, 0); } while (nready > 0 && ( #ifdef TALK_43 rp->vers != TALK_VERSION || #endif rp->type != type)); } while ( #ifdef TALK_43 rp->vers != TALK_VERSION || #endif rp->type != type); rp->id_num = ntohl(rp->id_num); #ifdef TALK_43 rp->addr.sa_family = ntohs(rp->addr.sa_family); # else rp->addr.sin_family = ntohs(rp->addr.sin_family); # endif } #endif