1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)talkd.8 8.2 (Berkeley) 12/11/93 33.\" $FreeBSD: src/libexec/talkd/talkd.8,v 1.3.2.2 2001/08/16 10:44:21 ru Exp $ 34.\" $DragonFly: src/libexec/talkd/talkd.8,v 1.2 2003/06/17 04:27:08 dillon Exp $ 35.\" 36.Dd December 11, 1993 37.Dt TALKD 8 38.Os 39.Sh NAME 40.Nm talkd 41.Nd remote user communication server 42.Sh SYNOPSIS 43.Nm 44.Sh DESCRIPTION 45.Nm Talkd 46is the server that notifies a user that someone else wants to 47initiate a conversation. 48It acts as a repository of invitations, responding to requests 49by clients wishing to rendezvous to hold a conversation. 50In normal operation, a client, the caller, 51initiates a rendezvous by sending a 52.Tn CTL_MSG 53to the server of 54type 55.Tn LOOK_UP 56(see 57.Aq Pa protocols/talkd.h ) . 58This causes the server to search its invitation 59tables to check if an invitation currently exists for the caller 60(to speak to the callee specified in the message). 61.Pp 62If the lookup fails, 63the caller then sends an 64.Tn ANNOUNCE 65message causing the server to 66broadcast an announcement on the callee's login ports requesting contact. 67.Pp 68When the callee responds, the local server uses the 69recorded invitation to respond with the appropriate rendezvous 70address and the caller and callee client programs establish a 71stream connection through which the conversation takes place. 72.Sh SEE ALSO 73.Xr talk 1 , 74.Xr write 1 75.Sh HISTORY 76The 77.Nm 78command appeared in 79.Bx 4.3 . 80