From 5b57d28ffb6e1ef86b50f7d05d977826eae89bfe Mon Sep 17 00:00:00 2001
From: Kiyoshi Aman <kiyoshi.aman+adelie@gmail.com>
Date: Fri, 1 Feb 2019 22:55:37 +0000
Subject: initial population

---
 usr.bin/talk/ctl_transact.c | 108 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 usr.bin/talk/ctl_transact.c

(limited to 'usr.bin/talk/ctl_transact.c')

diff --git a/usr.bin/talk/ctl_transact.c b/usr.bin/talk/ctl_transact.c
new file mode 100644
index 0000000..4d0613f
--- /dev/null
+++ b/usr.bin/talk/ctl_transact.c
@@ -0,0 +1,108 @@
+/*	$NetBSD: ctl_transact.c,v 1.11 2011/09/06 18:32:03 joerg 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 <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)ctl_transact.c	8.1 (Berkeley) 6/6/93";
+#endif
+__RCSID("$NetBSD: ctl_transact.c,v 1.11 2011/09/06 18:32:03 joerg Exp $");
+#endif /* not lint */
+
+#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(struct in_addr target, CTL_MSG tmsg, int type, CTL_RESPONSE *rp)
+{
+	struct pollfd set[1];
+	int nready, cc;
+
+	nready = 0;
+	tmsg.type = type;
+	daemon_addr.sin_addr = target;
+	daemon_addr.sin_port = daemon_port;
+	set[0].fd = ctl_sockt;
+	set[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 *)&tmsg, sizeof (tmsg), 0,
+			    (struct sockaddr *)&daemon_addr,
+			    sizeof (daemon_addr));
+			if (cc != sizeof (tmsg)) {
+				if (errno == EINTR)
+					continue;
+				p_error("Error on write to talk daemon");
+			}
+			nready = poll(set, 1, CTL_WAIT * 1000);
+			if (nready < 0) {
+				if (errno == EINTR)
+					continue;
+				p_error("Error waiting for daemon response");
+			}
+		} 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;
+				p_error("Error on read from talk daemon");
+			}
+			/* an immediate poll */
+			nready = poll(set, 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);
+	rp->addr.sa_family = ntohs(rp->addr.sa_family);
+}
-- 
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