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.\" $FreeBSD$ 34.\" 35.Dd December 11, 1993 36.Dt TALKD 8 37.Os 38.Sh NAME 39.Nm talkd 40.Nd remote user communication server 41.Sh SYNOPSIS 42.Nm 43.Sh DESCRIPTION 44The 45.Nm 46utility 47is the server that notifies a user that someone else wants to 48initiate a conversation. 49It acts as a repository of invitations, responding to requests 50by clients wishing to rendezvous to hold a conversation. 51In normal operation, a client, the caller, 52initiates a rendezvous by sending a 53.Tn CTL_MSG 54to the server of 55type 56.Tn LOOK_UP 57(see 58.In protocols/talkd.h ) . 59This causes the server to search its invitation 60tables to check if an invitation currently exists for the caller 61(to speak to the callee specified in the message). 62.Pp 63If the lookup fails, 64the caller then sends an 65.Tn ANNOUNCE 66message causing the server to 67broadcast an announcement on the callee's login ports requesting contact. 68.Pp 69When the callee responds, the local server uses the 70recorded invitation to respond with the appropriate rendezvous 71address and the caller and callee client programs establish a 72stream connection through which the conversation takes place. 73.Sh SEE ALSO 74.Xr talk 1 , 75.Xr write 1 76.Sh HISTORY 77The 78.Nm 79utility appeared in 80.Bx 4.3 . 81