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
| 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
|
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
| 47is the server that notifies a user that someone else wants to
48initiate a conversation.
49It acts as a repository of invitations, responding to requests
50by clients wishing to rendezvous to hold a conversation.
51In normal operation, a client, the caller,
52initiates a rendezvous by sending a
53.Tn CTL_MSG
54to the server of
55type
56.Tn LOOK_UP
57(see
58.Aq Pa protocols/talkd.h ) .
59This causes the server to search its invitation
60tables to check if an invitation currently exists for the caller
61(to speak to the callee specified in the message).
62.Pp
63If the lookup fails,
64the caller then sends an
65.Tn ANNOUNCE
66message causing the server to
67broadcast an announcement on the callee's login ports requesting contact.
68.Pp
69When the callee responds, the local server uses the
70recorded invitation to respond with the appropriate rendezvous
71address and the caller and callee client programs establish a
72stream connection through which the conversation takes place.
73.Sh SEE ALSO
74.Xr talk 1 ,
75.Xr write 1
76.Sh HISTORY
77The
78.Nm
|