21. Communicating with a Network Printer
21.1. Introduction
We now develop a program that can communicate with a network printer. These printers are connected to multiple computers via Ethernet and often support PostScript files as well as plain text files. Applications generally use the Internet Printing Protocol (IPP) to communicate with these printers, although some support alternative communication protocols.
We are about to describe two programs: a print spooler daemon that sends jobs to a printer and a command to submit print jobs to the spooler daemon. Since the print spooler has to do multiple things (e.g., communicate with clients submitting jobs, communicate with the printer, read files, scan directories), this gives us a chance to ...
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