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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)talkd.8 8.2 (Berkeley) 12/11/93 29.\" $FreeBSD$ 30.\" 31.Dd December 11, 1993 32.Dt TALKD 8 33.Os 34.Sh NAME 35.Nm talkd 36.Nd remote user communication server 37.Sh SYNOPSIS 38.Nm 39.Sh DESCRIPTION 40The 41.Nm 42utility 43is the server that notifies a user that someone else wants to 44initiate a conversation. 45It acts as a repository of invitations, responding to requests 46by clients wishing to rendezvous to hold a conversation. 47In normal operation, a client, the caller, 48initiates a rendezvous by sending a 49.Tn CTL_MSG 50to the server of 51type 52.Tn LOOK_UP 53(see 54.In protocols/talkd.h ) . 55This causes the server to search its invitation 56tables to check if an invitation currently exists for the caller 57(to speak to the callee specified in the message). 58.Pp 59If the lookup fails, 60the caller then sends an 61.Tn ANNOUNCE 62message causing the server to 63broadcast an announcement on the callee's login ports requesting contact. 64.Pp 65When the callee responds, the local server uses the 66recorded invitation to respond with the appropriate rendezvous 67address and the caller and callee client programs establish a 68stream connection through which the conversation takes place. 69.Sh SEE ALSO 70.Xr talk 1 , 71.Xr write 1 72.Sh HISTORY 73The 74.Nm 75utility appeared in 76.Bx 4.3 . 77