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| <h4 class="subsection">16.11.1 <code>inetd</code> Servers</h4> |
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| <p>Writing a server program to be run by <code>inetd</code> is very simple. Each time |
| someone requests a connection to the appropriate port, a new server |
| process starts. The connection already exists at this time; the |
| socket is available as the standard input descriptor and as the |
| standard output descriptor (descriptors 0 and 1) in the server |
| process. Thus the server program can begin reading and writing data |
| right away. Often the program needs only the ordinary I/O facilities; |
| in fact, a general-purpose filter program that knows nothing about |
| sockets can work as a byte stream server run by <code>inetd</code>. |
| |
| <p>You can also use <code>inetd</code> for servers that use connectionless |
| communication styles. For these servers, <code>inetd</code> does not try to accept |
| a connection since no connection is possible. It just starts the |
| server program, which can read the incoming datagram packet from |
| descriptor 0. The server program can handle one request and then |
| exit, or you can choose to write it to keep reading more requests |
| until no more arrive, and then exit. You must specify which of these |
| two techniques the server uses when you configure <code>inetd</code>. |
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