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Although lp(4) provides facility to read status of the printer port, this program read signal on the parallel interface directly through /dev/port pseudo device. The program is absolutely non-portable - it strongly depends to the underlying hardware and operating system, and will work only with some Linux operating system on Intel machines. It had worked on redhat Linux 6.x and Vine Linux 2.1.
xmkmf; make; make installin the directory where the source is stored. You should note that you must become the superuser (root) before running `run install'.
The command should be owned by kmem group and set-GID'ed so that it can read the /dev/port pseudo device.
Please send any feedback (such as bug reports, requests or comments) to Tom Sato <VEF00200@nifty.ne.jp>.
The latest version of this software and more information about it may be available at http://homepage3.nifty.com/tsato/.