1994-05-27 12:39:25 +00:00
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)talkd.8 8.2 (Berkeley) 12/11/93
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.\"
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.Dd December 11, 1993
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.Dt TALKD 8
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.Os BSD 4.3
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.Sh NAME
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.Nm talkd
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.Nd remote user communication server
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.Sh SYNOPSIS
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.Nm talkd
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.Sh DESCRIPTION
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.Nm Talkd
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is the server that notifies a user that someone else wants to
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initiate a conversation.
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It acts as a repository of invitations, responding to requests
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by clients wishing to rendezvous to hold a conversation.
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In normal operation, a client, the caller,
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initiates a rendezvous by sending a
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.Tn CTL_MSG
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to the server of
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type
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.Tn LOOK_UP
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(see
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.Aq Pa protocols/talkd.h ) .
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This causes the server to search its invitation
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tables to check if an invitation currently exists for the caller
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(to speak to the callee specified in the message).
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1997-12-02 12:33:42 +00:00
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.Pp
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1994-05-27 12:39:25 +00:00
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If the lookup fails,
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the caller then sends an
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.Tn ANNOUNCE
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message causing the server to
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broadcast an announcement on the callee's login ports requesting contact.
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1997-12-02 12:33:42 +00:00
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.Pp
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1994-05-27 12:39:25 +00:00
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When the callee responds, the local server uses the
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recorded invitation to respond with the appropriate rendezvous
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address and the caller and callee client programs establish a
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stream connection through which the conversation takes place.
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.Sh SEE ALSO
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.Xr talk 1 ,
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.Xr write 1
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 .
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