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 44.Nm Talkd 45is the server that notifies a user that someone else wants to 46initiate a conversation. 47It acts as a repository of invitations, responding to requests 48by clients wishing to rendezvous to hold a conversation. 49In normal operation, a client, the caller, 50initiates a rendezvous by sending a 51.Tn CTL_MSG 52to the server of 53type 54.Tn LOOK_UP 55(see 56.Aq Pa protocols/talkd.h ) . 57This causes the server to search its invitation 58tables to check if an invitation currently exists for the caller 59(to speak to the callee specified in the message). 60.Pp 61If the lookup fails, 62the caller then sends an 63.Tn ANNOUNCE 64message causing the server to 65broadcast an announcement on the callee's login ports requesting contact. 66.Pp 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