1.\" $OpenBSD: talkd.8,v 1.10 2017/05/25 20:27:55 tedu 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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" from: @(#)talkd.8 6.5 (Berkeley) 3/16/91 31.\" $Id: talkd.8,v 1.10 2017/05/25 20:27:55 tedu Exp $ 32.\" 33.Dd $Mdocdate: May 25 2017 $ 34.Dt NTALKD 8 35.Os 36.Sh NAME 37.Nm ntalkd 38.Nd remote user communication server 39.Sh SYNOPSIS 40.Nm ntalkd 41.Sh DESCRIPTION 42.Nm 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 CTL_MSG to the server 49of type 50.Dv LOOK_UP 51(see 52.In protocols/talkd.h ) . 53This causes the server to search its invitation 54tables to check if an invitation currently exists for the caller 55(to speak to the callee specified in the message). 56If the lookup fails, 57the caller then sends an 58.Dv ANNOUNCE 59message causing the server to 60broadcast an announcement on the callee's login ports requesting contact. 61When the callee responds, the local server uses the 62recorded invitation to respond with the appropriate rendezvous 63address and the caller and callee client programs establish a 64stream connection through which the conversation takes place. 65.Sh SEE ALSO 66.Xr talk 1 , 67.Xr write 1 , 68.Xr inetd 8 69.Sh HISTORY 70The 71.Nm 72command appeared in 73.Bx 4.3 , 74as 75.Nm talkd . 76