109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/* $NetBSD: ctl_transact.c,v 1.11 2011/09/06 18:32:03 joerg Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: ctl_transact.c,v 1.11 2011/09/06 18:32:03 joerg Exp $");
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#endif /* not lint */
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#include "talk.h"
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#include <sys/time.h>
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#include <errno.h>
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#include <unistd.h>
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#include <poll.h>
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#include "talk_ctl.h"
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#define CTL_WAIT 2 /* time to wait for a response, in seconds */
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/*
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* SOCKDGRAM is unreliable, so we must repeat messages if we have
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* not received an acknowledgement within a reasonable amount
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* of time
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*/
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void
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ctl_transact(struct in_addr target, CTL_MSG tmsg, int type, CTL_RESPONSE *rp)
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{
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struct pollfd set[1];
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int nready, cc;
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nready = 0;
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tmsg.type = type;
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daemon_addr.sin_addr = target;
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daemon_addr.sin_port = daemon_port;
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set[0].fd = ctl_sockt;
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set[0].events = POLLIN;
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/*
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* Keep sending the message until a response of
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* the proper type is obtained.
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*/
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do {
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/* resend message until a response is obtained */
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do {
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cc = sendto(ctl_sockt, (char *)&tmsg, sizeof (tmsg), 0,
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(struct sockaddr *)&daemon_addr,
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sizeof (daemon_addr));
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if (cc != sizeof (tmsg)) {
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if (errno == EINTR)
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continue;
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p_error("Error on write to talk daemon");
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}
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nready = poll(set, 1, CTL_WAIT * 1000);
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if (nready < 0) {
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if (errno == EINTR)
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continue;
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p_error("Error waiting for daemon response");
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}
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} while (nready == 0);
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/*
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* Keep reading while there are queued messages
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* (this is not necessary, it just saves extra
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* request/acknowledgements being sent)
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*/
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do {
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cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
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if (cc < 0) {
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if (errno == EINTR)
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continue;
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p_error("Error on read from talk daemon");
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}
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/* an immediate poll */
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nready = poll(set, 1, 0);
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} while (nready > 0 && (rp->vers != TALK_VERSION ||
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rp->type != type));
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} while (rp->vers != TALK_VERSION || rp->type != type);
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rp->id_num = ntohl(rp->id_num);
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rp->addr.sa_family = ntohs(rp->addr.sa_family);
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}
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