57 lines
2.3 KiB
Groff
57 lines
2.3 KiB
Groff
.\" $NetBSD: pud.4,v 1.4 2011/02/01 18:08:38 pooka Exp $
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.\"
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.\" Copyright (c) 2007 Antti Kantee.
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.\" All rights reserved.
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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.
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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 AND CONTRIBUTORS ``AS IS'' AND
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.\" 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 OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd November 21, 2007
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.Dt PUD 4
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.Os
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.Sh NAME
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.Nm pud
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.Nd Pass-to-Userspace Device
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.Sh SYNOPSIS
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.Cd "pseudo-device pud"
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.Cd "pseudo-device putter"
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.Sh DESCRIPTION
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The
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.Nm
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driver enables the implementation of block and character device drivers
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as userspace daemons.
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The daemons register the device major number they wish to handle.
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Registering a character device is mandatory, supporting the block
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device interface for same major device is optional.
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The major number must be available, i.e. another driver must not
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be registered to handle the operation.
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After successful registration the userspace daemon is supposed to
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handle the driver methods the kernel passes down to it.
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.Sh SEE ALSO
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.Xr puffs 4 ,
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.Xr putter 9
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.Sh BUGS
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This document is in a hit-in-the-head style obviously not even
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near complete.
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.Pp
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The subsystem lacks a puffs-style library that servers can be
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written against.
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