133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/* $NetBSD: ctl_transact.c,v 1.6 2003/06/11 12:00:22 wiz Exp $ */
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/*
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* Copyright (c) 1983-2003, Regents of the University of California.
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* 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 are
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* met:
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*
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* + 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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* + 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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* + Neither the name of the University of California, San Francisco nor
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* the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "bsd.h"
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#if defined(TALK_43) || defined(TALK_42)
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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 5.2 (Berkeley) 3/13/86";
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#else
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__RCSID("$NetBSD: ctl_transact.c,v 1.6 2003/06/11 12:00:22 wiz Exp $");
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#endif
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#endif /* not lint */
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#include <sys/time.h>
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#include <unistd.h>
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#include "hunt.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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#define MAX_RETRY 5
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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(target, msg, type, rp)
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struct in_addr target;
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CTL_MSG msg;
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int type;
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CTL_RESPONSE *rp;
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{
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struct pollfd set[1];
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int nready, cc, retries;
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nready = 0;
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msg.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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for (retries = MAX_RETRY; retries > 0; retries -= 1) {
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cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
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&daemon_addr, sizeof (daemon_addr));
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if (cc != sizeof (msg)) {
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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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if (nready != 0)
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break;
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}
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if (retries <= 0)
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break;
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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 && (
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#ifdef TALK_43
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rp->vers != TALK_VERSION ||
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#endif
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rp->type != type));
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} while (
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#ifdef TALK_43
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rp->vers != TALK_VERSION ||
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#endif
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rp->type != type);
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rp->id_num = ntohl(rp->id_num);
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#ifdef TALK_43
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rp->addr.sa_family = ntohs(rp->addr.sa_family);
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# else
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rp->addr.sin_family = ntohs(rp->addr.sin_family);
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# endif
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}
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#endif
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