netbsd man page for pud

PUD(4)							   BSD Kernel Interfaces Manual 						    PUD(4)

NAME
     pud -- Pass-to-Userspace Device

SYNOPSIS
     pseudo-device pud
     pseudo-device putter

DESCRIPTION
     The pud driver enables the implementation of block and character device drivers as userspace daemons.  The daemons register the device major
     number they wish to handle.  Registering a character device is mandatory, supporting the block device interface for same major device is
     optional.	The major number must be available, i.e. another driver must not be registered to handle the operation.  After successful regis-
     tration the userspace daemon is supposed to handle the driver methods the kernel passes down to it.

SEE ALSO
     puffs(4), putter(9)

BUGS
     This document is in a hit-in-the-head style obviously not even near complete.

     The subsystem lacks a puffs-style library that servers can be written against.

BSD
								 November 21, 2007							       BSD