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23 talkd: a server for communication between users

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.

     talkd [option]...
-a file
--acl=file
Read site-wide ACLs from file.
-d
--debug
Enable debugging.
-i seconds
--idle-timeout=seconds
Set idle timeout value.
-r seconds
--request-ttl=seconds
Set request time-to-live value.
-t seconds
--timeout=seconds
Set timeout value.

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.