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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: ctl_transact.c,v 1.11 2009/10/27 23:59:44 deraadt 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.
 */

#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);
}