74 lines
2.4 KiB
Groff
74 lines
2.4 KiB
Groff
.\" Copyright (c) 1997
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.\" Michael Smith
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
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.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD: src/share/man/man4/ppi.4,v 1.4.2.7 2001/12/17 11:30:12 ru Exp $
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.\"
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.Dd December 29, 2003
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.Dt PPI 4
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.Os
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.Sh NAME
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.Nm ppi
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.Nd "user-space interface to ppbus parallel port"
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.Sh SYNOPSIS
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.Cd "ppi* at ppbus?"
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.Pp
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Minor numbering: Unit numbers correspond directly to ppbus numbers.
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.Sh DESCRIPTION
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The
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.Nm
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driver provides a convenient means for user applications to manipulate the
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state of the parallel port, enabling easy low-speed I/O operations without
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the security problems inherent with the use of the
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.Pa /dev/io
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interface.
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.Pp
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The programming interface is described in
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.Xr ppi 9 .
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.Sh FILES
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.Sh SEE ALSO
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.Xr atppc 4 ,
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.Xr io 4 ,
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.Xr ppbus 4 ,
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.Xr ppi 9
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.Sh HISTORY
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.Nm
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originally appeared in
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.Fx .
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.Sh AUTHORS
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This manual page is based on the
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.Fx
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.Xr ppi 4
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manual page and was updated for NetBSD's port by
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.An Gary Thorpe .
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.Sh BUGS
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The inverse sense of signals is confusing.
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.Pp
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The
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.Fn ioctl
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interface is slow, and there is no way (yet) to chain multiple operations together.
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.Pp
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The headers required for user applications are not installed as part of the
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standard system.
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