usr/src/ucb/talk/README

Talk consists of two parts:

    talk itself, which is the user interface. Talk initiates the
         talk requests and negotiates with the suitable talk daemons.

    talkd, the talk daemon. Talkd announces an invitation to talk
         to a user on its' local machine and acts like a rendezvous
         point for inter-machine talks. The socket address's of
         the invitING talk process is kept at the local talkd of
         the invitEE. Talkd must run as root, and should be forked
         off on boot along with the other daemons. There is
         no provision for automatic restart of talkd. If for
         some reason it dies, it must be restarted by hand. Since
         talkd opens a special addresses socket (517 at the present
         time), the first talkd to run will lock out any other
         talkd. The locked out talkd will sit and bitch every
         15 seconds for about five minutes, so don't leave it running.


So, to install:

        run 'make install' from the top of the talk source directory.
        The install will fail if an older version of talkd is still
        running. If it does fail because of a 'text file busy' error,
        kill the old talkd and 'make install' again.

        execute '/usr/lib/talkd' to start the daemon immediately.

        Install a line in /etc/rc or /etc/rc.local to fork talkd off in
        background on reboot.

        Try talk. If it immediately fails with 'Bad system call', then
        you should recompile ctl.c with the -DGETSOCK flag and remake
        talk. This makes talk use getsockname (actually syscall(150))
        instead socketaddr(). This will go away once 4.1c stabilizes.