/* $OpenBSD: ctl_transact.c,v 1.10 2004/03/02 21:04:42 tedu Exp $ */ /* $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $ */ /* * Copyright (c) 1983, 1993 * The 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: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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. */ #ifndef lint #if 0 static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93"; #endif static const char rcsid[] = "$OpenBSD: ctl_transact.c,v 1.10 2004/03/02 21:04:42 tedu Exp $"; #endif /* not lint */ #include "talk.h" #include <sys/time.h> #include <errno.h> #include <unistd.h> #include <poll.h> #include "talk_ctl.h" #define CTL_WAIT 2 /* time to wait for a response, in seconds */ /* * 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 pfd[1]; int nready, cc; msg.type = type; daemon_addr.sin_addr = target; daemon_addr.sin_port = daemon_port; pfd[0].fd = ctl_sockt; pfd[0].events = POLLIN; /* * Keep sending the message until a response of * the proper type is obtained. */ do { /* resend message until a response is obtained */ do { cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0, (struct sockaddr *)&daemon_addr, sizeof (daemon_addr)); if (cc != sizeof (msg)) { if (errno == EINTR) continue; quit("Error on write to talk daemon", 1); } nready = poll(pfd, 1, CTL_WAIT * 1000); if (nready < 0) { if (errno == EINTR) continue; quit("Error waiting for daemon response", 1); } } while (nready == 0); /* * 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; quit("Error on read from talk daemon", 1); } nready = poll(pfd, 1, 0); } while (nready > 0 && (rp->vers != TALK_VERSION || rp->type != type)); } while (rp->vers != TALK_VERSION || rp->type != type); rp->id_num = ntohl(rp->id_num); }