1.\" $NetBSD: pud.4,v 1.2 2009/05/27 19:24:00 snj Exp $ 2.\" 3.\" Copyright (c) 2007 Antti Kantee. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.Dd November 21, 2007 28.Dt PUD 4 29.Os 30.Sh NAME 31.Nm pud 32.Nd Pass-to-Userspace Device 33.Sh SYNOPSIS 34.Cd "pseudo-device pud" 35.Sh DESCRIPTION 36The 37.Nm 38driver enables the implementation of block and character device drivers 39as userspace daemons. 40The daemons register the device major number they wish to handle. 41Registering a character device is mandatory, supporting the block 42device interface for same major device is optional. 43The major number must be available, i.e. another driver must not 44be registered to handle the operation. 45After successful registration the userspace daemon is supposed to 46handle the driver methods the kernel passes down to it. 47.Sh SEE ALSO 48.Xr puffs 4 , 49.Xr putter 9 50.Sh BUGS 51This document is in a hit-in-the-head style obviously not even 52near complete. 53But that does not matter, as neither is the code. 54