talkd.tproj/talkd.8

   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 .\"
  34 .Dd December 11, 1993
  35 .Dt TALKD 8
  36 .Os BSD 4.3
  37 .Sh NAME
  38 .Nm talkd
  39 .Nd remote user communication server
  40 .Sh SYNOPSIS
  41 .Nm talkd
  42 .Sh DESCRIPTION
  43 .Nm Talkd
  44 is the server that notifies a user that someone else wants to
  45 initiate a conversation.
  46 It acts as a repository of invitations, responding to requests
  47 by clients wishing to rendezvous to hold a conversation.
  48 In normal operation, a client, the caller,
  49 initiates a rendezvous by sending a
  50 .Tn CTL_MSG
  51 to the server of
  52 type
  53 .Tn LOOK_UP
  54 (see
  55 .Aq Pa protocols/talkd.h ) .
  56 This causes the server to search its invitation
  57 tables to check if an invitation currently exists for the caller
  58 (to speak to the callee specified in the message).
  59 If the lookup fails,
  60 the caller then sends an
  61 .Tn ANNOUNCE
  62 message causing the server to
  63 broadcast an announcement on the callee's login ports requesting contact.
  64 When the callee responds, the local server uses the
  65 recorded invitation to respond with the appropriate rendezvous
  66 address and the caller and callee client programs establish a
  67 stream connection through which the conversation takes place.
  68 .Sh SEE ALSO
  69 .Xr talk 1 ,
  70 .Xr write 1
  71 .Sh HISTORY
  72 The
  73 .Nm
  74 command appeared in
  75 .Bx 4.3 .