+++ /dev/null
-'\" t
-.\" Copyright (c) Michael Haardt (michael@cantor.informatik.rwth-aachen.de),
-.\" Sun Jan 15 19:16:33 1995
-.\"
-.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
-.\" This is free documentation; you can redistribute it and/or
-.\" modify it under the terms of the GNU General Public License as
-.\" published by the Free Software Foundation; either version 2 of
-.\" the License, or (at your option) any later version.
-.\"
-.\" The GNU General Public License's references to "object code"
-.\" and "executables" are to be interpreted as the output of any
-.\" document formatting or typesetting system, including
-.\" intermediate and printed output.
-.\"
-.\" This manual is distributed in the hope that it will be useful,
-.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
-.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-.\" GNU General Public License for more details.
-.\"
-.\" You should have received a copy of the GNU General Public
-.\" License along with this manual; if not, see
-.\" <http://www.gnu.org/licenses/>.
-.\" %%%LICENSE_END
-.\"
-.\" Modified, Sun Feb 26 15:02:58 1995, faith@cs.unc.edu
-.TH LP 4 1995-01-15 "Linux" "Linux Programmer's Manual"
-.SH NAME
-lp \- line printer devices
-.SH SYNOPSIS
-.B #include <linux/lp.h>
-.SH CONFIGURATION
-\fBlp\fP[0\(en2] are character devices for the parallel line printers;
-they have major number 6 and minor number 0\(en2.
-The minor numbers
-correspond to the printer port base addresses 0x03bc, 0x0378 and 0x0278.
-Usually they have mode 220 and are owned by root and group lp.
-You can use printer ports either with polling or with interrupts.
-Interrupts are recommended when high traffic is expected, for example,
-for laser printers.
-For usual dot matrix printers polling will usually be enough.
-The default is polling.
-.SH DESCRIPTION
-The following
-.BR ioctl (2)
-calls are supported:
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPTIME, int \fP\fIarg\fP\fB)\fP"
-Sets the amount of time that the driver sleeps before rechecking the printer
-when the printer's buffer appears to be filled to
-.IR arg .
-If you have a fast printer, decrease this number;
-if you have a slow printer, then increase it.
-This is in hundredths of a second, the default 2
-being 0.02 seconds.
-It only influences the polling driver.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPCHAR, int \fP\fIarg\fP\fB)\fP"
-Sets the maximum number of busy-wait iterations which the polling driver does
-while waiting for the printer to get ready for receiving a character to
-.IR arg .
-If printing is too slow, increase this number; if the
-system gets too slow, decrease this number.
-The default is 1000.
-It only influences the polling driver.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPABORT, int \fP\fIarg\fP\fB)\fP"
-If
-.I arg
-is 0, the printer driver will retry on errors, otherwise
-it will abort.
-The default is 0.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPABORTOPEN, int \fP\fIarg\fP\fB)\fP"
-If
-.I arg
-is 0,
-.BR open (2)
-will be aborted on error, otherwise error will be ignored.
-The default is to ignore it.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPCAREFUL, int \fP\fIarg\fP\fB)\fP"
-If
-.I arg
-is 0, then the out-of-paper, offline and error signals are
-required to be false on all writes, otherwise they are ignored.
-The default is to ignore them.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPWAIT, int \fP\fIarg\fP\fB)\fP"
-Sets the number of busy waiting iterations to wait before strobing the
-printer to accept a just-written character, and the number of iterations to
-wait before turning the strobe off again,
-to
-.IR arg .
-The specification says this time should be 0.5
-microseconds, but experience has shown the delay caused by the code is
-already enough.
-For that reason, the default value is 0.
-This is used for both the polling and the interrupt driver.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPSETIRQ, int \fP\fIarg\fP\fB)\fP"
-This
-.BR ioctl (2)
-requires superuser privileges.
-It takes an
-.I int
-containing the new IRQ as argument.
-As a side effect, the printer will be reset.
-When
-.I arg
-is 0, the polling driver will be used, which is also default.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPGETIRQ, int *\fP\fIarg\fP\fB)\fP"
-Stores the currently used IRQ in
-.IR arg .
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPGETSTATUS, int *\fP\fIarg\fP\fB)\fP"
-Stores the value of the status port in
-.IR arg .
-The bits have the following meaning:
-.TS
-l l.
-LP_PBUSY inverted busy input, active high
-LP_PACK unchanged acknowledge input, active low
-LP_POUTPA unchanged out-of-paper input, active high
-LP_PSELECD unchanged selected input, active high
-LP_PERRORP unchanged error input, active low
-.TE
-.sp
-Refer to your printer manual for the meaning of the signals.
-Note that undocumented bits may also be set, depending on your printer.
-.IP "\fBint ioctl(int \fP\fIfd\fP\fB, LPRESET)\fP"
-Resets the printer.
-No argument is used.
-.SH FILES
-/dev/lp*
-.\" .SH AUTHORS
-.\" The printer driver was originally written by Jim Weigand and Linus
-.\" Torvalds.
-.\" It was further improved by Michael K.\& Johnson.
-.\" The interrupt code was written by Nigel Gamble.
-.\" Alan Cox modularized it.
-.\" LPCAREFUL, LPABORT, LPGETSTATUS were added by Chris Metcalf.
-.SH SEE ALSO
-.BR chmod (1),
-.BR chown (1),
-.BR mknod (1),
-.BR lpcntl (8),
-.BR tunelp (8)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.
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