NAME
talkd — remote user communication server
DESCRIPTION
Talkd
is the server that notifies a user that someone wants to
initiate a conversation.
It acts as a repository of invitations, responding to requests
by clients wishing to initiate a conversation.
To initiate a conversation, the client
(the
talk
command) sends a message of type LOOK_UP to the server
(see
/usr/include/protocols/talkd.h).
This causes the server to search its invitation
table to check if an invitation currently exists for the caller
to talk to the callee specified in the message.
If the lookup fails,
the caller then sends a message of type ANNOUNCE, which
causes the server to
display an announcement on the callee's terminal requesting contact.
When the callee responds, the local server uses the
recorded invitation to respond with the appropriate rendezvous
address and the caller and callee client programs establish a
stream connection through which the conversation takes place.
To activate the talk service, the following entry must be
added to the
/etc/inetd.conf
file:
ntalk dgram udp wait root /usr/lbin/ntalkd ntalkd
