1.\" $OpenBSD: talkd.8,v 1.3 1999/05/23 14:11:13 aaron Exp $ 2.\" 3.\" Copyright (c) 1983, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)talkd.8 6.5 (Berkeley) 3/16/91 35.\" $Id: talkd.8,v 1.3 1999/05/23 14:11:13 aaron Exp $ 36.\" 37.Dd March 16, 1991 38.Dt TALKD 8 39.Os 40.Sh NAME 41.Nm talkd 42.Nd remote user communication server 43.Sh SYNOPSIS 44.Nm talkd 45.Sh DESCRIPTION 46.Nm Talkd 47is the server that notifies a user that someone else wants to 48initiate a conversation. 49It acts 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.Aq Pa 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). 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. 67When the callee responds, the local server uses the 68recorded invitation to respond with the appropriate rendezvous 69address and the caller and callee client programs establish a 70stream connection through which the conversation takes place. 71.Sh SEE ALSO 72.Xr talk 1 , 73.Xr write 1 74.Sh HISTORY 75The 76.Nm 77command appeared in 78.Bx 4.3 . 79