1.\" $NetBSD: pud.4,v 1.4 2011/02/01 18:08:38 pooka 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.Cd "pseudo-device putter" 36.Sh DESCRIPTION 37The 38.Nm 39driver enables the implementation of block and character device drivers 40as userspace daemons. 41The daemons register the device major number they wish to handle. 42Registering a character device is mandatory, supporting the block 43device interface for same major device is optional. 44The major number must be available, i.e. another driver must not 45be registered to handle the operation. 46After successful registration the userspace daemon is supposed to 47handle the driver methods the kernel passes down to it. 48.Sh SEE ALSO 49.Xr puffs 4 , 50.Xr putter 9 51.Sh BUGS 52This document is in a hit-in-the-head style obviously not even 53near complete. 54.Pp 55The subsystem lacks a puffs-style library that servers can be 56written against. 57