fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*
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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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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)ctl_transact.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <arpa/inet.h>
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#include <errno.h>
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#include <poll.h>
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#include "talk.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 lmsg, int type, CTL_RESPONSE *rp)
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{
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struct pollfd pfd[1];
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int nready = 0, cc;
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lmsg.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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pfd[0].fd = ctl_sockt;
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pfd[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 *)&lmsg, sizeof (lmsg), 0,
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(struct sockaddr *)&daemon_addr,
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sizeof (daemon_addr));
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if (cc != sizeof (lmsg)) {
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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(pfd, 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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nready = poll(pfd, 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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