talkd - remote user communication server
talkd
Talkd is the server that notifies a user that someone else
wants to initiate
a conversation. It acts as a repository of invitations, responding
to requests by clients wishing to rendezvous to hold a conversation. In
normal operation, a client, the caller, initiates a rendezvous by sending
a CTL_MSG to the server of type LOOK_UP (see
<protocols/talkd.h>). This
causes the server to search its invitation tables to check
if an invitation
currently exists for the caller (to speak to the callee
specified in
the message). If the lookup fails, the caller then sends an
ANNOUNCE
message causing the server to broadcast an announcement on
the callee's
login ports 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.
talk(1), write(1)
The talkd command appeared in 4.3BSD.
OpenBSD 3.6 March 16, 1991
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