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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 num‐
     ber 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 reg‐
     istered to handle the operation.  After successful registration 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 com‐
     plete.

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

BSD			       November 21, 2007			   BSD

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