PUD(4) | Device Drivers Manual | PUD(4) |
pud
—
Pass-to-Userspace Device
pseudo-device pud
pseudo-device putter
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 registration the userspace daemon is supposed to handle the
driver methods the kernel passes down to it.
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.
November 21, 2007 | NetBSD 10.99 |