114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/* $NetBSD: ctl_transact.c,v 1.4 2001/06/12 15:17:12 wiz Exp $ */
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/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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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 1.4 2001/06/12 15:17:12 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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fd_set read_mask, ctl_mask;
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int nready, cc, retries;
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struct timeval wait;
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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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FD_ZERO(&ctl_mask);
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FD_SET(ctl_sockt, &ctl_mask);
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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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wait.tv_sec = CTL_WAIT;
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wait.tv_usec = 0;
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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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(struct sockaddr *)&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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read_mask = ctl_mask;
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nready = select(32, &read_mask, 0, 0, &wait);
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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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read_mask = ctl_mask;
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/* an immediate poll */
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timerclear(&wait);
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nready = select(32, &read_mask, 0, 0, &wait);
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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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