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(libc.info)Inetd

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The `inetd' Daemon
==================

   We've explained above how to write a server program that does its own
listening.  Such a server must already be running in order for anyone
to connect to it.

   Another way to provide a service on an Internet port is to let the
daemon program `inetd' do the listening.  `inetd' is a program that
runs all the time and waits (using `select') for messages on a
specified set of ports.  When it receives a message, it accepts the
connection (if the socket style calls for connections) and then forks a
child process to run the corresponding server program.  You specify the
ports and their programs in the file `/etc/inetd.conf'.

Inetd Servers

Configuring Inetd