talkd, ntalkd - The remote communications server for the talk command
The talkd server notifies a user or callee when a client or caller wants to
initiate a conversation. The talkd daemon sets up the conversation if the
callee accepts the invitation. The caller initiates a conversation by exe-
cuting the talk command and specifying the callee. The callee accepts the
invitation by executing the talk command specifying the caller.
The talkd daemon listens at a socket for a LOOK_UP request from a local or
remote talk client. On receiving a LOOK_UP request, talkd scans its inter-
nal invitation table for an entry that pairs the client (the local or
remote talk process) with a caller.
If an entry exists in the talkd daemon's international invitation table,
the talkd daemon assumes that the client process is the callee. The talkd
daemon returns the appropriate rendezvous address to the talk process for
the callee. The callee process then establishes a stream connection with
the caller process.
If an entry does not exist in the invitation table, the talkd daemon
assumes that the client process is the caller. The talkd daemon then
receives the client process's ANNOUNCE request. When talkd receives the
ANNOUNCE request, talkd broadcasts an invitation on the console of the
remote host where the callee is logged in, unless the caller specifies a
particular tty. At approximately 1-minute intervals, talkd rebroadcasts
the invitation until either the invitation is answered by the callee or the
call is canceled by the caller.
Debugging messages are sent to syslogd(8). For further information on the
files used by this daemon, see the syslogd command.
The Tru64 UNIX version of talkd uses the talk 4.3BSD protocol. This command
is sometimes referred to as ntalkd. It is not compatible with 4.2BSD ver-
sions of talk.
Specifies the command path
Defines Internet socket assignments
Contains data about users who are currently logged in
Commands: talk(1), inetd(8), syslogd(8)