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
