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16.3 Built-in services

The inetd program provides several “trivial” services internally by use of routines within itself. All these services can operate both in ‘stream’ and in ‘dgram’ mode. They are:

echo
Send back to the originating source any data received from it. This is a debugging and measurement tool.
discard
Silently throw away any data received.
chargen
This is a character generator service. It can be operated as both stream or dgram service. When operating in ‘stream’ mode, once a connection is established a stream of data is sent out the connection (and any data received is thrown away). This continues until the calling user terminates the connection. When operating in ‘dgram’ mode, inetd listens for UDP datagrams, and for each received datagram, answers with a datagram containing a random number (between 0 and 512) of characters. Any data in the received datagram are ignored.
daytime
Send back the current date and time in a human readable form. Any input is discarded.
time
Send back the current date and time as a 32-bit integer number, nrepresenting the number of seconds since midnight, January 1, 1900.